On Thu, Jul 26, 2018 at 11:29 AM, syzbot <syzbot+604f8271211546f5b3c7 at syzkaller.appspotmail.com> wrote:> Hello, > > syzbot found the following crash on: > > HEAD commit: dc66fe43b7eb rds: send: Fix dead code in rds_sendmsg > git tree: net-next > console output: https://syzkaller.appspot.com/x/log.txt?x=127874c8400000 > kernel config: https://syzkaller.appspot.com/x/.config?x=f34ce142a9f5f0e8 > dashboard link: https://syzkaller.appspot.com/bug?extid=604f8271211546f5b3c7 > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > > Unfortunately, I don't have any reproducer for this crash yet. > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+604f8271211546f5b3c7 at syzkaller.appspotmail.com > > possible deadlock in static_key_slow_incsd 0:0:1:0: [sda] Attached SCSI disk > MACsec IEEE 802.1AE > tun: Universal TUN/TAP device driver, 1.6 > > ===========================================> WARNING: possible recursive locking detected+Tetsuo, perhaps this boot lockdep problem then disables lockdep for actual testing. I think lockdep should respect panic_on_warn.> 4.18.0-rc6+ #141 Not tainted > -------------------------------------------- > swapper/0/1 is trying to acquire lock: > (____ptrval____) (cpu_hotplug_lock.rw_sem){++++}, at: > static_key_slow_inc+0x12/0x30 kernel/jump_label.c:124 > > but task is already holding lock: > (____ptrval____) (cpu_hotplug_lock.rw_sem){++++}, at: get_online_cpus > include/linux/cpu.h:126 [inline] > (____ptrval____) (cpu_hotplug_lock.rw_sem){++++}, at: init_vqs+0xe1a/0x1520 > drivers/net/virtio_net.c:2777 > > other info that might help us debug this: > Possible unsafe locking scenario: > > CPU0 > ---- > lock(cpu_hotplug_lock.rw_sem); > lock(cpu_hotplug_lock.rw_sem); > > *** DEADLOCK *** > > May be due to missing lock nesting notation > > 3 locks held by swapper/0/1: > #0: (____ptrval____) (&dev->mutex){....}, at: device_lock > include/linux/device.h:1134 [inline] > #0: (____ptrval____) (&dev->mutex){....}, at: __driver_attach+0x15f/0x2f0 > drivers/base/dd.c:820 > #1: (____ptrval____) (cpu_hotplug_lock.rw_sem){++++}, at: get_online_cpus > include/linux/cpu.h:126 [inline] > #1: (____ptrval____) (cpu_hotplug_lock.rw_sem){++++}, at: > init_vqs+0xe1a/0x1520 drivers/net/virtio_net.c:2777 > #2: (____ptrval____) (xps_map_mutex){+.+.}, at: > __netif_set_xps_queue+0x243/0x23f0 net/core/dev.c:2278 > > stack backtrace: > CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.18.0-rc6+ #141 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 > print_deadlock_bug kernel/locking/lockdep.c:1765 [inline] > check_deadlock kernel/locking/lockdep.c:1809 [inline] > validate_chain kernel/locking/lockdep.c:2405 [inline] > __lock_acquire.cold.65+0x1fb/0x486 kernel/locking/lockdep.c:3435 > lock_acquire+0x1e4/0x540 kernel/locking/lockdep.c:3924 > percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline] > percpu_down_read include/linux/percpu-rwsem.h:59 [inline] > cpus_read_lock+0x43/0xa0 kernel/cpu.c:289 > static_key_slow_inc+0x12/0x30 kernel/jump_label.c:124 > __netif_set_xps_queue+0xaac/0x23f0 net/core/dev.c:2320 > netif_set_xps_queue+0x26/0x30 net/core/dev.c:2455 > virtnet_set_affinity+0x2ba/0x4b0 drivers/net/virtio_net.c:1944 > init_vqs+0xe22/0x1520 drivers/net/virtio_net.c:2778 > virtnet_probe+0x1092/0x2260 drivers/net/virtio_net.c:3016 > virtio_dev_probe+0x592/0x942 drivers/virtio/virtio.c:245 > really_probe drivers/base/dd.c:446 [inline] > driver_probe_device+0x6ad/0x970 drivers/base/dd.c:588 > __driver_attach+0x28b/0x2f0 drivers/base/dd.c:822 > bus_for_each_dev+0x15d/0x1f0 drivers/base/bus.c:311 > driver_attach+0x3d/0x50 drivers/base/dd.c:841 > bus_add_driver+0x4b2/0x600 drivers/base/bus.c:667 > driver_register+0x1c8/0x320 drivers/base/driver.c:170 > register_virtio_driver+0x79/0xd0 drivers/virtio/virtio.c:296 > virtio_net_driver_init+0x8d/0xc9 drivers/net/virtio_net.c:3209 > do_one_initcall+0x127/0x913 init/main.c:884 > do_initcall_level init/main.c:952 [inline] > do_initcalls init/main.c:960 [inline] > do_basic_setup init/main.c:978 [inline] > kernel_init_freeable+0x49b/0x58e init/main.c:1135 > kernel_init+0x11/0x1b3 init/main.c:1061 > ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 > vcan: Virtual CAN interface driver > vxcan: Virtual CAN Tunnel driver > slcan: serial line CAN interface driver > slcan: 10 dynamic interface channels. > CAN device driver interface > enic: Cisco VIC Ethernet NIC Driver, ver 2.3.0.53 > e100: Intel(R) PRO/100 Network Driver, 3.5.24-k2-NAPI > e100: Copyright(c) 1999-2006 Intel Corporation > e1000: Intel(R) PRO/1000 Network Driver - version 7.3.21-k8-NAPI > e1000: Copyright (c) 1999-2006 Intel Corporation. > e1000e: Intel(R) PRO/1000 Network Driver - 3.2.6-k > e1000e: Copyright(c) 1999 - 2015 Intel Corporation. > sky2: driver version 1.30 > PPP generic driver version 2.4.2 > PPP BSD Compression module registered > PPP Deflate Compression module registered > PPP MPPE Compression module registered > NET: Registered protocol family 24 > PPTP driver version 0.8.5 > mac80211_hwsim: initializing netlink > ieee80211 phy0: Selected rate control algorithm 'minstrel_ht' > ieee80211 phy1: Selected rate control algorithm 'minstrel_ht' > usbcore: registered new interface driver asix > usbcore: registered new interface driver ax88179_178a > usbcore: registered new interface driver cdc_ether > usbcore: registered new interface driver net1080 > usbcore: registered new interface driver cdc_subset > usbcore: registered new interface driver zaurus > usbcore: registered new interface driver cdc_ncm > aoe: AoE v85 initialised. > ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver > ehci-pci: EHCI PCI platform driver > ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver > ohci-pci: OHCI PCI platform driver > uhci_hcd: USB Universal Host Controller Interface driver > usbcore: registered new interface driver usblp > usbcore: registered new interface driver usb-storage > i8042: PNP: PS/2 Controller [PNP0303:KBD,PNP0f13:MOU] at 0x60,0x64 irq 1,12 > i8042: Warning: Keylock active > serio: i8042 KBD port at 0x60,0x64 irq 1 > serio: i8042 AUX port at 0x60,0x64 irq 12 > mousedev: PS/2 mouse device common for all mice > rtc_cmos 00:00: RTC can wake from S4 > rtc_cmos 00:00: registered as rtc0 > rtc_cmos 00:00: alarms up to one day, 114 bytes nvram > i2c /dev entries driver > piix4_smbus 0000:00:01.3: SMBus base address uninitialized - upgrade BIOS or > use force_addr=0xaddr > i2c-parport-light: adapter type unspecified > usbcore: registered new interface driver RobotFuzz Open Source InterFace, > OSIF > usbcore: registered new interface driver i2c-tiny-usb > device-mapper: ioctl: 4.39.0-ioctl (2018-04-03) initialised: > dm-devel at redhat.com > device-mapper: raid: Loading target version 1.13.2 > usbcore: registered new interface driver btusb > usnic_verbs: Cisco VIC (USNIC) Verbs Driver v1.0.3 (December 19, 2013) > usnic_verbs:usnic_uiom_init:585: > IOMMU required but not present or enabled. USNIC QPs will not function w/o > enabling IOMMU > usnic_verbs:usnic_ib_init:649: > Unable to initalize umem with err -1 > iscsi: registered transport (iser) > OPA Virtual Network Driver - v1.0 > hidraw: raw HID events driver (C) Jiri Kosina > usbcore: registered new interface driver usbhid > usbhid: USB HID core driver > NET: Registered protocol family 40 > ashmem: initialized > NET: Registered protocol family 26 > Mirror/redirect action on > Simple TC action Loaded > netem: version 1.3 > u32 classifier > Actions configured > nf_conntrack_irc: failed to register helpers > nf_conntrack_sane: failed to register helpers > nf_conntrack_sip: failed to register helpers > xt_time: kernel timezone is -0000 > IPVS: Registered protocols (TCP, UDP, SCTP, AH, ESP) > IPVS: Connection hash table configured (size=4096, memory=64Kbytes) > IPVS: ipvs loaded. > IPVS: [rr] scheduler registered. > IPVS: [wrr] scheduler registered. > IPVS: [lc] scheduler registered. > IPVS: [wlc] scheduler registered. > IPVS: [fo] scheduler registered. > IPVS: [ovf] scheduler registered. > IPVS: [lblc] scheduler registered. > IPVS: [lblcr] scheduler registered. > IPVS: [dh] scheduler registered. > IPVS: [sh] scheduler registered. > IPVS: [mh] scheduler registered. > IPVS: [sed] scheduler registered. > IPVS: [nq] scheduler registered. > IPVS: ftp: loaded support on port[0] = 21 > IPVS: [sip] pe registered. > ipip: IPv4 and MPLS over IPv4 tunneling driver > gre: GRE over IPv4 demultiplexor driver > ip_gre: GRE over IPv4 tunneling driver > IPv4 over IPsec tunneling driver > ipt_CLUSTERIP: ClusterIP Version 0.8 loaded successfully > Initializing XFRM netlink socket > NET: Registered protocol family 10 > Segment Routing with IPv6 > mip6: Mobile IPv6 > sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver > ip6_gre: GRE over IPv6 tunneling driver > bpfilter: Loaded bpfilter_umh pid 2080 > NET: Registered protocol family 15 > Bridge firewalling registered > can: controller area network core (rev 20170425 abi 9) > NET: Registered protocol family 29 > can: raw protocol (rev 20170425) > can: broadcast manager protocol (rev 20170425 t) > can: netlink gateway (rev 20170425) max_hops=1 > Bluetooth: RFCOMM TTY layer initialized > Bluetooth: RFCOMM socket layer initialized > Bluetooth: RFCOMM ver 1.11 > Bluetooth: BNEP (Ethernet Emulation) ver 1.3 > Bluetooth: BNEP filters: protocol multicast > Bluetooth: BNEP socket layer initialized > Bluetooth: HIDP (Human Interface Emulation) ver 1.2 > Bluetooth: HIDP socket layer initialized > RPC: Registered rdma transport module. > RPC: Registered rdma backchannel transport module. > NET: Registered protocol family 41 > lec:lane_module_init: lec.c: initialized > mpoa:atm_mpoa_init: mpc.c: initialized > l2tp_core: L2TP core driver, V2.0 > l2tp_ppp: PPPoL2TP kernel driver, V2.0 > 8021q: 802.1Q VLAN Support v1.8 > input: AT Translated Set 2 keyboard as > /devices/platform/i8042/serio0/input/input2 > DCCP: Activated CCID 2 (TCP-like) > DCCP: Activated CCID 3 (TCP-Friendly Rate Control) > sctp: Hash tables configured (bind 64/64) > tipc: Activated (version 2.0.0) > NET: Registered protocol family 30 > tipc: Started in single node mode > NET: Registered protocol family 43 > 9pnet: Installing 9P2000 support > NET: Registered protocol family 36 > Key type dns_resolver registered > Key type ceph registered > libceph: loaded (mon/osd proto 15/24) > openvswitch: Open vSwitch switching datapath > mpls_gso: MPLS GSO support > start plist test > end plist test > AVX2 version of gcm_enc/dec engaged. > AES CTR mode by8 optimization enabled > sched_clock: Marking stable (4559438359, 0)->(6126385605, -1566947246) > registered taskstats version 1 > Loading compiled-in X.509 certificates > zswap: default zpool zbud not available > zswap: pool creation failed > Btrfs loaded, crc32c=crc32c-intel > Key type big_key registered > Key type encrypted registered > Magic number: 10:317:168 > console [netcon0] enabled > netconsole: network logging started > gtp: GTP module loaded (pdp ctx size 104 bytes) > rdma_rxe: loaded > cfg80211: Loading compiled-in X.509 certificates for regulatory database > cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7' > platform regulatory.0: Direct firmware load for regulatory.db failed with > error -2 > cfg80211: failed to load regulatory.db > ALSA device list: > #0: Dummy 1 > #1: Loopback 1 > #2: Virtual MIDI Card 1 > input: ImExPS/2 Generic Explorer Mouse as > /devices/platform/i8042/serio1/input/input4 > md: Waiting for all devices to be available before autodetect > md: If you don't use raid, use raid=noautodetect > md: Autodetecting RAID arrays. > md: autorun ... > md: ... autorun DONE. > EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: (null) > VFS: Mounted root (ext4 filesystem) readonly on device 8:1. > devtmpfs: mounted > Freeing unused kernel memory: 3900K > Kernel memory protection disabled. > SELinux: Disabled at runtime. > SELinux: Unregistering netfilter hooks > audit: type=1404 audit(1532588961.277:2): enforcing=0 old_enforcing=0 > auid=4294967295 ses=4294967295 enabled=0 old-enabled=1 lsm=selinux res=1 > stty (2166) used greatest stack depth: 19664 bytes left > EXT4-fs (sda1): re-mounted. Opts: (null) > logsave (3615) used greatest stack depth: 17632 bytes left > random: dd: uninitialized urandom read (512 bytes read) > =================================================================> BUG: KASAN: slab-out-of-bounds in virtnet_receive > drivers/net/virtio_net.c:1356 [inline]+virtio maintainers for this one Probably something very recent.> BUG: KASAN: slab-out-of-bounds in virtnet_poll+0x111a/0x1226 > drivers/net/virtio_net.c:1421 > Read of size 8 at addr ffff8801cee08ff0 by task ip/3969 > > CPU: 0 PID: 3969 Comm: ip Not tainted 4.18.0-rc6+ #141 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > <IRQ> > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 > print_address_description+0x6c/0x20b mm/kasan/report.c:256 > kasan_report_error mm/kasan/report.c:354 [inline] > kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 > __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 > virtnet_receive drivers/net/virtio_net.c:1356 [inline] > virtnet_poll+0x111a/0x1226 drivers/net/virtio_net.c:1421 > napi_poll net/core/dev.c:6214 [inline] > net_rx_action+0x7a5/0x1920 net/core/dev.c:6280 > __do_softirq+0x2e8/0xb17 kernel/softirq.c:292 > do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1046 > </IRQ> > do_softirq.part.18+0x155/0x1a0 kernel/softirq.c:336 > do_softirq arch/x86/include/asm/preempt.h:23 [inline] > __local_bh_enable_ip+0x1ec/0x230 kernel/softirq.c:189 > local_bh_enable include/linux/bottom_half.h:32 [inline] > virtnet_napi_enable+0x8c/0xb0 drivers/net/virtio_net.c:1264 > virtnet_open+0x16d/0x4d0 drivers/net/virtio_net.c:1464 > __dev_open+0x26d/0x410 net/core/dev.c:1392 > __dev_change_flags+0x739/0x9c0 net/core/dev.c:7434 > dev_change_flags+0x89/0x150 net/core/dev.c:7503 > do_setlink+0xb16/0x3dd0 net/core/rtnetlink.c:2416 > rtnl_newlink+0x138d/0x1d60 net/core/rtnetlink.c:3029 > rtnetlink_rcv_msg+0x46e/0xc30 net/core/rtnetlink.c:4705 > netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2447 > rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4723 > netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] > netlink_unicast+0x5a0/0x760 net/netlink/af_netlink.c:1336 > netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1901 > sock_sendmsg_nosec net/socket.c:641 [inline] > sock_sendmsg+0xd5/0x120 net/socket.c:651 > ___sys_sendmsg+0x7fd/0x930 net/socket.c:2125 > __sys_sendmsg+0x11d/0x290 net/socket.c:2163 > __do_sys_sendmsg net/socket.c:2172 [inline] > __se_sys_sendmsg net/socket.c:2170 [inline] > __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2170 > do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x7f318d594320 > Code: 02 48 83 c8 ff eb 8d 48 8b 05 14 7b 2a 00 f7 da 64 89 10 48 83 c8 ff > eb c9 90 83 3d d5 d2 2a 00 00 75 10 b8 2e 00 00 00 0f 05 <48> 3d 01 f0 ff ff > 73 31 c3 48 83 ec 08 e8 5e ba 00 00 48 89 04 24 > RSP: 002b:00007ffd985d8f38 EFLAGS: 00000246 ORIG_RAX: 000000000000002e > RAX: ffffffffffffffda RBX: 00007ffd985dd030 RCX: 00007f318d594320 > RDX: 0000000000000000 RSI: 00007ffd985d8f70 RDI: 0000000000000003 > RBP: 00007ffd985d8f70 R08: 0000000000000000 R09: 000000000000000f > R10: 0000000000000000 R11: 0000000000000246 R12: 000000005b5973aa > R13: 0000000000000000 R14: 00000000006395c0 R15: 00007ffd985dd808 > > Allocated by task 1: > save_stack+0x43/0xd0 mm/kasan/kasan.c:448 > set_track mm/kasan/kasan.c:460 [inline] > kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 > __do_kmalloc mm/slab.c:3718 [inline] > __kmalloc+0x14e/0x760 mm/slab.c:3727 > kmalloc_array include/linux/slab.h:635 [inline] > kcalloc include/linux/slab.h:646 [inline] > virtnet_alloc_queues drivers/net/virtio_net.c:2731 [inline] > init_vqs+0x127/0x1520 drivers/net/virtio_net.c:2769 > virtnet_probe+0x1092/0x2260 drivers/net/virtio_net.c:3016 > virtio_dev_probe+0x592/0x942 drivers/virtio/virtio.c:245 > really_probe drivers/base/dd.c:446 [inline] > driver_probe_device+0x6ad/0x970 drivers/base/dd.c:588 > __driver_attach+0x28b/0x2f0 drivers/base/dd.c:822 > bus_for_each_dev+0x15d/0x1f0 drivers/base/bus.c:311 > driver_attach+0x3d/0x50 drivers/base/dd.c:841 > bus_add_driver+0x4b2/0x600 drivers/base/bus.c:667 > driver_register+0x1c8/0x320 drivers/base/driver.c:170 > register_virtio_driver+0x79/0xd0 drivers/virtio/virtio.c:296 > virtio_net_driver_init+0x8d/0xc9 drivers/net/virtio_net.c:3209 > do_one_initcall+0x127/0x913 init/main.c:884 > do_initcall_level init/main.c:952 [inline] > do_initcalls init/main.c:960 [inline] > do_basic_setup init/main.c:978 [inline] > kernel_init_freeable+0x49b/0x58e init/main.c:1135 > kernel_init+0x11/0x1b3 init/main.c:1061 > ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 > > Freed by task 0: > (stack is not available) > > The buggy address belongs to the object at ffff8801cee08500 > which belongs to the cache kmalloc-4096 of size 4096 > The buggy address is located 2800 bytes inside of > 4096-byte region [ffff8801cee08500, ffff8801cee09500) > The buggy address belongs to the page: > page:ffffea00073b8200 count:1 mapcount:0 mapping:ffff8801dac00dc0 index:0x0 > compound_mapcount: 0 > flags: 0x2fffc0000008100(slab|head) > raw: 02fffc0000008100 ffffea00073b7d88 ffffea00073b8288 ffff8801dac00dc0 > raw: 0000000000000000 ffff8801cee08500 0000000100000001 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff8801cee08e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff8801cee08f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >> >> ffff8801cee08f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > > ^ > ffff8801cee09000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff8801cee09080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > =================================================================> > > --- > This bug is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller at googlegroups.com. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with > syzbot. > > -- > You received this message because you are subscribed to the Google Groups > "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to syzkaller-bugs+unsubscribe at googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/syzkaller-bugs/000000000000352dc20571e3a0d8%40google.com. > For more options, visit https://groups.google.com/d/optout.
[ Added Thomas Gleixner ] On Thu, 26 Jul 2018 11:34:39 +0200 Dmitry Vyukov <dvyukov at google.com> wrote:> On Thu, Jul 26, 2018 at 11:29 AM, syzbot > <syzbot+604f8271211546f5b3c7 at syzkaller.appspotmail.com> wrote: > > Hello, > > > > syzbot found the following crash on: > > > > HEAD commit: dc66fe43b7eb rds: send: Fix dead code in rds_sendmsg > > git tree: net-next > > console output: https://syzkaller.appspot.com/x/log.txt?x=127874c8400000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=f34ce142a9f5f0e8 > > dashboard link: https://syzkaller.appspot.com/bug?extid=604f8271211546f5b3c7 > > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > > > > Unfortunately, I don't have any reproducer for this crash yet. > > > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > > Reported-by: syzbot+604f8271211546f5b3c7 at syzkaller.appspotmail.com > > > > possible deadlock in static_key_slow_incsd 0:0:1:0: [sda] Attached SCSI disk > > MACsec IEEE 802.1AE > > tun: Universal TUN/TAP device driver, 1.6 > > > > ===========================================> > WARNING: possible recursive locking detected > > +Tetsuo, perhaps this boot lockdep problem then disables lockdep for > actual testing. I think lockdep should respect panic_on_warn. > > > > 4.18.0-rc6+ #141 Not tainted > > -------------------------------------------- > > swapper/0/1 is trying to acquire lock: > > (____ptrval____) (cpu_hotplug_lock.rw_sem){++++}, at: > > static_key_slow_inc+0x12/0x30 kernel/jump_label.c:124 > > > > but task is already holding lock: > > (____ptrval____) (cpu_hotplug_lock.rw_sem){++++}, at: get_online_cpus > > include/linux/cpu.h:126 [inline] > > (____ptrval____) (cpu_hotplug_lock.rw_sem){++++}, at: init_vqs+0xe1a/0x1520 > > drivers/net/virtio_net.c:2777Here init_vqs() does: get_online_cpus(); virtnet_set_affinity(vi); put_online_cpus(); Which disables cpu hotplug and calls virtnet_set_affinity() Note, get_online_cpus() is no longer recursive.> > > > other info that might help us debug this: > > Possible unsafe locking scenario: > > > > CPU0 > > ---- > > lock(cpu_hotplug_lock.rw_sem); > > lock(cpu_hotplug_lock.rw_sem); > > > > *** DEADLOCK *** > > > > May be due to missing lock nesting notation > > > > 3 locks held by swapper/0/1: > > #0: (____ptrval____) (&dev->mutex){....}, at: device_lock > > include/linux/device.h:1134 [inline] > > #0: (____ptrval____) (&dev->mutex){....}, at: __driver_attach+0x15f/0x2f0 > > drivers/base/dd.c:820 > > #1: (____ptrval____) (cpu_hotplug_lock.rw_sem){++++}, at: get_online_cpus > > include/linux/cpu.h:126 [inline] > > #1: (____ptrval____) (cpu_hotplug_lock.rw_sem){++++}, at: > > init_vqs+0xe1a/0x1520 drivers/net/virtio_net.c:2777 > > #2: (____ptrval____) (xps_map_mutex){+.+.}, at: > > __netif_set_xps_queue+0x243/0x23f0 net/core/dev.c:2278 > > > > stack backtrace: > > CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.18.0-rc6+ #141 > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > > Google 01/01/2011 > > Call Trace: > > __dump_stack lib/dump_stack.c:77 [inline] > > dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 > > print_deadlock_bug kernel/locking/lockdep.c:1765 [inline] > > check_deadlock kernel/locking/lockdep.c:1809 [inline] > > validate_chain kernel/locking/lockdep.c:2405 [inline] > > __lock_acquire.cold.65+0x1fb/0x486 kernel/locking/lockdep.c:3435 > > lock_acquire+0x1e4/0x540 kernel/locking/lockdep.c:3924 > > percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline] > > percpu_down_read include/linux/percpu-rwsem.h:59 [inline] > > cpus_read_lock+0x43/0xa0 kernel/cpu.c:289 > > static_key_slow_inc+0x12/0x30 kernel/jump_label.c:124 > > __netif_set_xps_queue+0xaac/0x23f0 net/core/dev.c:2320__netif_set_xps_queue() calls static_key_slow_inc() which will also do a get_online_cpus() which will trigger this bug. There's a static_key_slow_inc_cpuslocked() version that should be used when get_online_cpus() is already taken, but I see __netif_set_xps_queue() is called from several places, and I doubt it is always called with get_online_cpus() held. Thus just using the cpuslocked() version is probably not sufficient of a fix. I don't know the code enough to offer other suggestions. -- Steve> > netif_set_xps_queue+0x26/0x30 net/core/dev.c:2455 > > virtnet_set_affinity+0x2ba/0x4b0 drivers/net/virtio_net.c:1944 > > init_vqs+0xe22/0x1520 drivers/net/virtio_net.c:2778 > > virtnet_probe+0x1092/0x2260 drivers/net/virtio_net.c:3016 > > virtio_dev_probe+0x592/0x942 drivers/virtio/virtio.c:245 > > really_probe drivers/base/dd.c:446 [inline] > > driver_probe_device+0x6ad/0x970 drivers/base/dd.c:588 > > __driver_attach+0x28b/0x2f0 drivers/base/dd.c:822 > > bus_for_each_dev+0x15d/0x1f0 drivers/base/bus.c:311 > > driver_attach+0x3d/0x50 drivers/base/dd.c:841 > > bus_add_driver+0x4b2/0x600 drivers/base/bus.c:667 > > driver_register+0x1c8/0x320 drivers/base/driver.c:170 > > register_virtio_driver+0x79/0xd0 drivers/virtio/virtio.c:296 > > virtio_net_driver_init+0x8d/0xc9 drivers/net/virtio_net.c:3209 > > do_one_initcall+0x127/0x913 init/main.c:884 > > do_initcall_level init/main.c:952 [inline] > > do_initcalls init/main.c:960 [inline] > > do_basic_setup init/main.c:978 [inline] > > kernel_init_freeable+0x49b/0x58e init/main.c:1135 > > kernel_init+0x11/0x1b3 init/main.c:1061 > > ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 > > vcan: Virtual CAN interface driver > > vxcan: Virtual CAN Tunnel driver > > slcan: serial line CAN interface driver > > slcan: 10 dynamic interface channels. > > CAN device driver interface > > enic: Cisco VIC Ethernet NIC Driver, ver 2.3.0.53 > > e100: Intel(R) PRO/100 Network Driver, 3.5.24-k2-NAPI > > e100: Copyright(c) 1999-2006 Intel Corporation > > e1000: Intel(R) PRO/1000 Network Driver - version 7.3.21-k8-NAPI > > e1000: Copyright (c) 1999-2006 Intel Corporation. > > e1000e: Intel(R) PRO/1000 Network Driver - 3.2.6-k > > e1000e: Copyright(c) 1999 - 2015 Intel Corporation. > > sky2: driver version 1.30 > > PPP generic driver version 2.4.2 > > PPP BSD Compression module registered > > PPP Deflate Compression module registered > > PPP MPPE Compression module registered > > NET: Registered protocol family 24 > > PPTP driver version 0.8.5 > > mac80211_hwsim: initializing netlink > > ieee80211 phy0: Selected rate control algorithm 'minstrel_ht' > > ieee80211 phy1: Selected rate control algorithm 'minstrel_ht' > > usbcore: registered new interface driver asix > > usbcore: registered new interface driver ax88179_178a > > usbcore: registered new interface driver cdc_ether > > usbcore: registered new interface driver net1080 > > usbcore: registered new interface driver cdc_subset > > usbcore: registered new interface driver zaurus > > usbcore: registered new interface driver cdc_ncm > > aoe: AoE v85 initialised. > > ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver > > ehci-pci: EHCI PCI platform driver > > ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver > > ohci-pci: OHCI PCI platform driver > > uhci_hcd: USB Universal Host Controller Interface driver > > usbcore: registered new interface driver usblp > > usbcore: registered new interface driver usb-storage > > i8042: PNP: PS/2 Controller [PNP0303:KBD,PNP0f13:MOU] at 0x60,0x64 irq 1,12 > > i8042: Warning: Keylock active > > serio: i8042 KBD port at 0x60,0x64 irq 1 > > serio: i8042 AUX port at 0x60,0x64 irq 12 > > mousedev: PS/2 mouse device common for all mice > > rtc_cmos 00:00: RTC can wake from S4 > > rtc_cmos 00:00: registered as rtc0 > > rtc_cmos 00:00: alarms up to one day, 114 bytes nvram > > i2c /dev entries driver > > piix4_smbus 0000:00:01.3: SMBus base address uninitialized - upgrade BIOS or > > use force_addr=0xaddr > > i2c-parport-light: adapter type unspecified > > usbcore: registered new interface driver RobotFuzz Open Source InterFace, > > OSIF > > usbcore: registered new interface driver i2c-tiny-usb > > device-mapper: ioctl: 4.39.0-ioctl (2018-04-03) initialised: > > dm-devel at redhat.com > > device-mapper: raid: Loading target version 1.13.2 > > usbcore: registered new interface driver btusb > > usnic_verbs: Cisco VIC (USNIC) Verbs Driver v1.0.3 (December 19, 2013) > > usnic_verbs:usnic_uiom_init:585: > > IOMMU required but not present or enabled. USNIC QPs will not function w/o > > enabling IOMMU > > usnic_verbs:usnic_ib_init:649: > > Unable to initalize umem with err -1 > > iscsi: registered transport (iser) > > OPA Virtual Network Driver - v1.0 > > hidraw: raw HID events driver (C) Jiri Kosina > > usbcore: registered new interface driver usbhid > > usbhid: USB HID core driver > > NET: Registered protocol family 40 > > ashmem: initialized > > NET: Registered protocol family 26 > > Mirror/redirect action on > > Simple TC action Loaded > > netem: version 1.3 > > u32 classifier > > Actions configured > > nf_conntrack_irc: failed to register helpers > > nf_conntrack_sane: failed to register helpers > > nf_conntrack_sip: failed to register helpers > > xt_time: kernel timezone is -0000 > > IPVS: Registered protocols (TCP, UDP, SCTP, AH, ESP) > > IPVS: Connection hash table configured (size=4096, memory=64Kbytes) > > IPVS: ipvs loaded. > > IPVS: [rr] scheduler registered. > > IPVS: [wrr] scheduler registered. > > IPVS: [lc] scheduler registered. > > IPVS: [wlc] scheduler registered. > > IPVS: [fo] scheduler registered. > > IPVS: [ovf] scheduler registered. > > IPVS: [lblc] scheduler registered. > > IPVS: [lblcr] scheduler registered. > > IPVS: [dh] scheduler registered. > > IPVS: [sh] scheduler registered. > > IPVS: [mh] scheduler registered. > > IPVS: [sed] scheduler registered. > > IPVS: [nq] scheduler registered. > > IPVS: ftp: loaded support on port[0] = 21 > > IPVS: [sip] pe registered. > > ipip: IPv4 and MPLS over IPv4 tunneling driver > > gre: GRE over IPv4 demultiplexor driver > > ip_gre: GRE over IPv4 tunneling driver > > IPv4 over IPsec tunneling driver > > ipt_CLUSTERIP: ClusterIP Version 0.8 loaded successfully > > Initializing XFRM netlink socket > > NET: Registered protocol family 10 > > Segment Routing with IPv6 > > mip6: Mobile IPv6 > > sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver > > ip6_gre: GRE over IPv6 tunneling driver > > bpfilter: Loaded bpfilter_umh pid 2080 > > NET: Registered protocol family 15 > > Bridge firewalling registered > > can: controller area network core (rev 20170425 abi 9) > > NET: Registered protocol family 29 > > can: raw protocol (rev 20170425) > > can: broadcast manager protocol (rev 20170425 t) > > can: netlink gateway (rev 20170425) max_hops=1 > > Bluetooth: RFCOMM TTY layer initialized > > Bluetooth: RFCOMM socket layer initialized > > Bluetooth: RFCOMM ver 1.11 > > Bluetooth: BNEP (Ethernet Emulation) ver 1.3 > > Bluetooth: BNEP filters: protocol multicast > > Bluetooth: BNEP socket layer initialized > > Bluetooth: HIDP (Human Interface Emulation) ver 1.2 > > Bluetooth: HIDP socket layer initialized > > RPC: Registered rdma transport module. > > RPC: Registered rdma backchannel transport module. > > NET: Registered protocol family 41 > > lec:lane_module_init: lec.c: initialized > > mpoa:atm_mpoa_init: mpc.c: initialized > > l2tp_core: L2TP core driver, V2.0 > > l2tp_ppp: PPPoL2TP kernel driver, V2.0 > > 8021q: 802.1Q VLAN Support v1.8 > > input: AT Translated Set 2 keyboard as > > /devices/platform/i8042/serio0/input/input2 > > DCCP: Activated CCID 2 (TCP-like) > > DCCP: Activated CCID 3 (TCP-Friendly Rate Control) > > sctp: Hash tables configured (bind 64/64) > > tipc: Activated (version 2.0.0) > > NET: Registered protocol family 30 > > tipc: Started in single node mode > > NET: Registered protocol family 43 > > 9pnet: Installing 9P2000 support > > NET: Registered protocol family 36 > > Key type dns_resolver registered > > Key type ceph registered > > libceph: loaded (mon/osd proto 15/24) > > openvswitch: Open vSwitch switching datapath > > mpls_gso: MPLS GSO support > > start plist test > > end plist test > > AVX2 version of gcm_enc/dec engaged. > > AES CTR mode by8 optimization enabled > > sched_clock: Marking stable (4559438359, 0)->(6126385605, -1566947246) > > registered taskstats version 1 > > Loading compiled-in X.509 certificates > > zswap: default zpool zbud not available > > zswap: pool creation failed > > Btrfs loaded, crc32c=crc32c-intel > > Key type big_key registered > > Key type encrypted registered > > Magic number: 10:317:168 > > console [netcon0] enabled > > netconsole: network logging started > > gtp: GTP module loaded (pdp ctx size 104 bytes) > > rdma_rxe: loaded > > cfg80211: Loading compiled-in X.509 certificates for regulatory database > > cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7' > > platform regulatory.0: Direct firmware load for regulatory.db failed with > > error -2 > > cfg80211: failed to load regulatory.db > > ALSA device list: > > #0: Dummy 1 > > #1: Loopback 1 > > #2: Virtual MIDI Card 1 > > input: ImExPS/2 Generic Explorer Mouse as > > /devices/platform/i8042/serio1/input/input4 > > md: Waiting for all devices to be available before autodetect > > md: If you don't use raid, use raid=noautodetect > > md: Autodetecting RAID arrays. > > md: autorun ... > > md: ... autorun DONE. > > EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: (null) > > VFS: Mounted root (ext4 filesystem) readonly on device 8:1. > > devtmpfs: mounted > > Freeing unused kernel memory: 3900K > > Kernel memory protection disabled. > > SELinux: Disabled at runtime. > > SELinux: Unregistering netfilter hooks > > audit: type=1404 audit(1532588961.277:2): enforcing=0 old_enforcing=0 > > auid=4294967295 ses=4294967295 enabled=0 old-enabled=1 lsm=selinux res=1 > > stty (2166) used greatest stack depth: 19664 bytes left > > EXT4-fs (sda1): re-mounted. Opts: (null) > > logsave (3615) used greatest stack depth: 17632 bytes left > > random: dd: uninitialized urandom read (512 bytes read) > > =================================================================> > BUG: KASAN: slab-out-of-bounds in virtnet_receive > > drivers/net/virtio_net.c:1356 [inline] > > +virtio maintainers for this one > Probably something very recent. > > > BUG: KASAN: slab-out-of-bounds in virtnet_poll+0x111a/0x1226 > > drivers/net/virtio_net.c:1421 > > Read of size 8 at addr ffff8801cee08ff0 by task ip/3969 > > > > CPU: 0 PID: 3969 Comm: ip Not tainted 4.18.0-rc6+ #141 > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > > Google 01/01/2011 > > Call Trace: > > <IRQ> > > __dump_stack lib/dump_stack.c:77 [inline] > > dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 > > print_address_description+0x6c/0x20b mm/kasan/report.c:256 > > kasan_report_error mm/kasan/report.c:354 [inline] > > kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 > > __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 > > virtnet_receive drivers/net/virtio_net.c:1356 [inline] > > virtnet_poll+0x111a/0x1226 drivers/net/virtio_net.c:1421 > > napi_poll net/core/dev.c:6214 [inline] > > net_rx_action+0x7a5/0x1920 net/core/dev.c:6280 > > __do_softirq+0x2e8/0xb17 kernel/softirq.c:292 > > do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1046 > > </IRQ> > > do_softirq.part.18+0x155/0x1a0 kernel/softirq.c:336 > > do_softirq arch/x86/include/asm/preempt.h:23 [inline] > > __local_bh_enable_ip+0x1ec/0x230 kernel/softirq.c:189 > > local_bh_enable include/linux/bottom_half.h:32 [inline] > > virtnet_napi_enable+0x8c/0xb0 drivers/net/virtio_net.c:1264 > > virtnet_open+0x16d/0x4d0 drivers/net/virtio_net.c:1464 > > __dev_open+0x26d/0x410 net/core/dev.c:1392 > > __dev_change_flags+0x739/0x9c0 net/core/dev.c:7434 > > dev_change_flags+0x89/0x150 net/core/dev.c:7503 > > do_setlink+0xb16/0x3dd0 net/core/rtnetlink.c:2416 > > rtnl_newlink+0x138d/0x1d60 net/core/rtnetlink.c:3029 > > rtnetlink_rcv_msg+0x46e/0xc30 net/core/rtnetlink.c:4705 > > netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2447 > > rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4723 > > netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] > > netlink_unicast+0x5a0/0x760 net/netlink/af_netlink.c:1336 > > netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1901 > > sock_sendmsg_nosec net/socket.c:641 [inline] > > sock_sendmsg+0xd5/0x120 net/socket.c:651 > > ___sys_sendmsg+0x7fd/0x930 net/socket.c:2125 > > __sys_sendmsg+0x11d/0x290 net/socket.c:2163 > > __do_sys_sendmsg net/socket.c:2172 [inline] > > __se_sys_sendmsg net/socket.c:2170 [inline] > > __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2170 > > do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 > > entry_SYSCALL_64_after_hwframe+0x49/0xbe > > RIP: 0033:0x7f318d594320 > > Code: 02 48 83 c8 ff eb 8d 48 8b 05 14 7b 2a 00 f7 da 64 89 10 48 83 c8 ff > > eb c9 90 83 3d d5 d2 2a 00 00 75 10 b8 2e 00 00 00 0f 05 <48> 3d 01 f0 ff ff > > 73 31 c3 48 83 ec 08 e8 5e ba 00 00 48 89 04 24 > > RSP: 002b:00007ffd985d8f38 EFLAGS: 00000246 ORIG_RAX: 000000000000002e > > RAX: ffffffffffffffda RBX: 00007ffd985dd030 RCX: 00007f318d594320 > > RDX: 0000000000000000 RSI: 00007ffd985d8f70 RDI: 0000000000000003 > > RBP: 00007ffd985d8f70 R08: 0000000000000000 R09: 000000000000000f > > R10: 0000000000000000 R11: 0000000000000246 R12: 000000005b5973aa > > R13: 0000000000000000 R14: 00000000006395c0 R15: 00007ffd985dd808 > > > > Allocated by task 1: > > save_stack+0x43/0xd0 mm/kasan/kasan.c:448 > > set_track mm/kasan/kasan.c:460 [inline] > > kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 > > __do_kmalloc mm/slab.c:3718 [inline] > > __kmalloc+0x14e/0x760 mm/slab.c:3727 > > kmalloc_array include/linux/slab.h:635 [inline] > > kcalloc include/linux/slab.h:646 [inline] > > virtnet_alloc_queues drivers/net/virtio_net.c:2731 [inline] > > init_vqs+0x127/0x1520 drivers/net/virtio_net.c:2769 > > virtnet_probe+0x1092/0x2260 drivers/net/virtio_net.c:3016 > > virtio_dev_probe+0x592/0x942 drivers/virtio/virtio.c:245 > > really_probe drivers/base/dd.c:446 [inline] > > driver_probe_device+0x6ad/0x970 drivers/base/dd.c:588 > > __driver_attach+0x28b/0x2f0 drivers/base/dd.c:822 > > bus_for_each_dev+0x15d/0x1f0 drivers/base/bus.c:311 > > driver_attach+0x3d/0x50 drivers/base/dd.c:841 > > bus_add_driver+0x4b2/0x600 drivers/base/bus.c:667 > > driver_register+0x1c8/0x320 drivers/base/driver.c:170 > > register_virtio_driver+0x79/0xd0 drivers/virtio/virtio.c:296 > > virtio_net_driver_init+0x8d/0xc9 drivers/net/virtio_net.c:3209 > > do_one_initcall+0x127/0x913 init/main.c:884 > > do_initcall_level init/main.c:952 [inline] > > do_initcalls init/main.c:960 [inline] > > do_basic_setup init/main.c:978 [inline] > > kernel_init_freeable+0x49b/0x58e init/main.c:1135 > > kernel_init+0x11/0x1b3 init/main.c:1061 > > ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 > > > > Freed by task 0: > > (stack is not available) > > > > The buggy address belongs to the object at ffff8801cee08500 > > which belongs to the cache kmalloc-4096 of size 4096 > > The buggy address is located 2800 bytes inside of > > 4096-byte region [ffff8801cee08500, ffff8801cee09500) > > The buggy address belongs to the page: > > page:ffffea00073b8200 count:1 mapcount:0 mapping:ffff8801dac00dc0 index:0x0 > > compound_mapcount: 0 > > flags: 0x2fffc0000008100(slab|head) > > raw: 02fffc0000008100 ffffea00073b7d88 ffffea00073b8288 ffff8801dac00dc0 > > raw: 0000000000000000 ffff8801cee08500 0000000100000001 0000000000000000 > > page dumped because: kasan: bad access detected > > > > Memory state around the buggy address: > > ffff8801cee08e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > > ffff8801cee08f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > >> > >> ffff8801cee08f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > > > > ^ > > ffff8801cee09000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > > ffff8801cee09080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > > =================================================================> > > > > > --- > > This bug is generated by a bot. It may contain errors. > > See https://goo.gl/tpsmEJ for more information about syzbot. > > syzbot engineers can be reached at syzkaller at googlegroups.com. > > > > syzbot will keep track of this bug report. See: > > https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with > > syzbot. > > > > -- > > You received this message because you are subscribed to the Google Groups > > "syzkaller-bugs" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to syzkaller-bugs+unsubscribe at googlegroups.com. > > To view this discussion on the web visit > > https://groups.google.com/d/msgid/syzkaller-bugs/000000000000352dc20571e3a0d8%40google.com. > > For more options, visit https://groups.google.com/d/optout.
On Thu, Jul 26, 2018 at 10:17:48AM -0400, Steven Rostedt wrote:> > [ Added Thomas Gleixner ] > > > On Thu, 26 Jul 2018 11:34:39 +0200 > Dmitry Vyukov <dvyukov at google.com> wrote: > > > On Thu, Jul 26, 2018 at 11:29 AM, syzbot > > <syzbot+604f8271211546f5b3c7 at syzkaller.appspotmail.com> wrote: > > > Hello, > > > > > > syzbot found the following crash on: > > > > > > HEAD commit: dc66fe43b7eb rds: send: Fix dead code in rds_sendmsg > > > git tree: net-next > > > console output: https://syzkaller.appspot.com/x/log.txt?x=127874c8400000 > > > kernel config: https://syzkaller.appspot.com/x/.config?x=f34ce142a9f5f0e8 > > > dashboard link: https://syzkaller.appspot.com/bug?extid=604f8271211546f5b3c7 > > > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > > > > > > Unfortunately, I don't have any reproducer for this crash yet. > > > > > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > > > Reported-by: syzbot+604f8271211546f5b3c7 at syzkaller.appspotmail.com > > > > > > possible deadlock in static_key_slow_incsd 0:0:1:0: [sda] Attached SCSI disk > > > MACsec IEEE 802.1AE > > > tun: Universal TUN/TAP device driver, 1.6 > > > > > > ===========================================> > > WARNING: possible recursive locking detected > > > > +Tetsuo, perhaps this boot lockdep problem then disables lockdep for > > actual testing. I think lockdep should respect panic_on_warn. > > > > > > > 4.18.0-rc6+ #141 Not tainted > > > -------------------------------------------- > > > swapper/0/1 is trying to acquire lock: > > > (____ptrval____) (cpu_hotplug_lock.rw_sem){++++}, at: > > > static_key_slow_inc+0x12/0x30 kernel/jump_label.c:124 > > > > > > but task is already holding lock: > > > (____ptrval____) (cpu_hotplug_lock.rw_sem){++++}, at: get_online_cpus > > > include/linux/cpu.h:126 [inline] > > > (____ptrval____) (cpu_hotplug_lock.rw_sem){++++}, at: init_vqs+0xe1a/0x1520 > > > drivers/net/virtio_net.c:2777 > > Here init_vqs() does: > > get_online_cpus(); > virtnet_set_affinity(vi); > put_online_cpus(); > > Which disables cpu hotplug and calls virtnet_set_affinity() > > Note, get_online_cpus() is no longer recursive. > > > > > > > other info that might help us debug this: > > > Possible unsafe locking scenario: > > > > > > CPU0 > > > ---- > > > lock(cpu_hotplug_lock.rw_sem); > > > lock(cpu_hotplug_lock.rw_sem); > > > > > > *** DEADLOCK *** > > > > > > May be due to missing lock nesting notation > > > > > > 3 locks held by swapper/0/1: > > > #0: (____ptrval____) (&dev->mutex){....}, at: device_lock > > > include/linux/device.h:1134 [inline] > > > #0: (____ptrval____) (&dev->mutex){....}, at: __driver_attach+0x15f/0x2f0 > > > drivers/base/dd.c:820 > > > #1: (____ptrval____) (cpu_hotplug_lock.rw_sem){++++}, at: get_online_cpus > > > include/linux/cpu.h:126 [inline] > > > #1: (____ptrval____) (cpu_hotplug_lock.rw_sem){++++}, at: > > > init_vqs+0xe1a/0x1520 drivers/net/virtio_net.c:2777 > > > #2: (____ptrval____) (xps_map_mutex){+.+.}, at: > > > __netif_set_xps_queue+0x243/0x23f0 net/core/dev.c:2278 > > > > > > stack backtrace: > > > CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.18.0-rc6+ #141 > > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > > > Google 01/01/2011 > > > Call Trace: > > > __dump_stack lib/dump_stack.c:77 [inline] > > > dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 > > > print_deadlock_bug kernel/locking/lockdep.c:1765 [inline] > > > check_deadlock kernel/locking/lockdep.c:1809 [inline] > > > validate_chain kernel/locking/lockdep.c:2405 [inline] > > > __lock_acquire.cold.65+0x1fb/0x486 kernel/locking/lockdep.c:3435 > > > lock_acquire+0x1e4/0x540 kernel/locking/lockdep.c:3924 > > > percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline] > > > percpu_down_read include/linux/percpu-rwsem.h:59 [inline] > > > cpus_read_lock+0x43/0xa0 kernel/cpu.c:289 > > > static_key_slow_inc+0x12/0x30 kernel/jump_label.c:124 > > > __netif_set_xps_queue+0xaac/0x23f0 net/core/dev.c:2320 > > > __netif_set_xps_queue() calls static_key_slow_inc() which will also do > a get_online_cpus() which will trigger this bug. > > There's a static_key_slow_inc_cpuslocked() version that should be used > when get_online_cpus() is already taken, but I see > __netif_set_xps_queue() is called from several places, and I doubt it > is always called with get_online_cpus() held. Thus just using the > cpuslocked() version is probably not sufficient of a fix. > > I don't know the code enough to offer other suggestions. > > -- SteveOK so the guess is it's due to combination of commit 04157469b7b848f4a9978b63b1ea2ce62ad3a0a3 Author: Amritha Nambiar <amritha.nambiar at intel.com> Date: Fri Jun 29 21:26:46 2018 -0700 net: Use static_key for XPS maps which uses static_key_slow_inc and commit 8af2c06ff4b144064b51b7f688194474123d9c9c Author: Amritha Nambiar <amritha.nambiar at intel.com> Date: Fri Jun 29 21:27:07 2018 -0700 net-sysfs: Add interface for Rx queue(s) map per Tx queue which makes it all user-triggerable.> > > > netif_set_xps_queue+0x26/0x30 net/core/dev.c:2455 > > > virtnet_set_affinity+0x2ba/0x4b0 drivers/net/virtio_net.c:1944 > > > init_vqs+0xe22/0x1520 drivers/net/virtio_net.c:2778 > > > virtnet_probe+0x1092/0x2260 drivers/net/virtio_net.c:3016 > > > virtio_dev_probe+0x592/0x942 drivers/virtio/virtio.c:245 > > > really_probe drivers/base/dd.c:446 [inline] > > > driver_probe_device+0x6ad/0x970 drivers/base/dd.c:588 > > > __driver_attach+0x28b/0x2f0 drivers/base/dd.c:822 > > > bus_for_each_dev+0x15d/0x1f0 drivers/base/bus.c:311 > > > driver_attach+0x3d/0x50 drivers/base/dd.c:841 > > > bus_add_driver+0x4b2/0x600 drivers/base/bus.c:667 > > > driver_register+0x1c8/0x320 drivers/base/driver.c:170 > > > register_virtio_driver+0x79/0xd0 drivers/virtio/virtio.c:296 > > > virtio_net_driver_init+0x8d/0xc9 drivers/net/virtio_net.c:3209 > > > do_one_initcall+0x127/0x913 init/main.c:884 > > > do_initcall_level init/main.c:952 [inline] > > > do_initcalls init/main.c:960 [inline] > > > do_basic_setup init/main.c:978 [inline] > > > kernel_init_freeable+0x49b/0x58e init/main.c:1135 > > > kernel_init+0x11/0x1b3 init/main.c:1061 > > > ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 > > > vcan: Virtual CAN interface driver > > > vxcan: Virtual CAN Tunnel driver > > > slcan: serial line CAN interface driver > > > slcan: 10 dynamic interface channels. > > > CAN device driver interface > > > enic: Cisco VIC Ethernet NIC Driver, ver 2.3.0.53 > > > e100: Intel(R) PRO/100 Network Driver, 3.5.24-k2-NAPI > > > e100: Copyright(c) 1999-2006 Intel Corporation > > > e1000: Intel(R) PRO/1000 Network Driver - version 7.3.21-k8-NAPI > > > e1000: Copyright (c) 1999-2006 Intel Corporation. > > > e1000e: Intel(R) PRO/1000 Network Driver - 3.2.6-k > > > e1000e: Copyright(c) 1999 - 2015 Intel Corporation. > > > sky2: driver version 1.30 > > > PPP generic driver version 2.4.2 > > > PPP BSD Compression module registered > > > PPP Deflate Compression module registered > > > PPP MPPE Compression module registered > > > NET: Registered protocol family 24 > > > PPTP driver version 0.8.5 > > > mac80211_hwsim: initializing netlink > > > ieee80211 phy0: Selected rate control algorithm 'minstrel_ht' > > > ieee80211 phy1: Selected rate control algorithm 'minstrel_ht' > > > usbcore: registered new interface driver asix > > > usbcore: registered new interface driver ax88179_178a > > > usbcore: registered new interface driver cdc_ether > > > usbcore: registered new interface driver net1080 > > > usbcore: registered new interface driver cdc_subset > > > usbcore: registered new interface driver zaurus > > > usbcore: registered new interface driver cdc_ncm > > > aoe: AoE v85 initialised. > > > ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver > > > ehci-pci: EHCI PCI platform driver > > > ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver > > > ohci-pci: OHCI PCI platform driver > > > uhci_hcd: USB Universal Host Controller Interface driver > > > usbcore: registered new interface driver usblp > > > usbcore: registered new interface driver usb-storage > > > i8042: PNP: PS/2 Controller [PNP0303:KBD,PNP0f13:MOU] at 0x60,0x64 irq 1,12 > > > i8042: Warning: Keylock active > > > serio: i8042 KBD port at 0x60,0x64 irq 1 > > > serio: i8042 AUX port at 0x60,0x64 irq 12 > > > mousedev: PS/2 mouse device common for all mice > > > rtc_cmos 00:00: RTC can wake from S4 > > > rtc_cmos 00:00: registered as rtc0 > > > rtc_cmos 00:00: alarms up to one day, 114 bytes nvram > > > i2c /dev entries driver > > > piix4_smbus 0000:00:01.3: SMBus base address uninitialized - upgrade BIOS or > > > use force_addr=0xaddr > > > i2c-parport-light: adapter type unspecified > > > usbcore: registered new interface driver RobotFuzz Open Source InterFace, > > > OSIF > > > usbcore: registered new interface driver i2c-tiny-usb > > > device-mapper: ioctl: 4.39.0-ioctl (2018-04-03) initialised: > > > dm-devel at redhat.com > > > device-mapper: raid: Loading target version 1.13.2 > > > usbcore: registered new interface driver btusb > > > usnic_verbs: Cisco VIC (USNIC) Verbs Driver v1.0.3 (December 19, 2013) > > > usnic_verbs:usnic_uiom_init:585: > > > IOMMU required but not present or enabled. USNIC QPs will not function w/o > > > enabling IOMMU > > > usnic_verbs:usnic_ib_init:649: > > > Unable to initalize umem with err -1 > > > iscsi: registered transport (iser) > > > OPA Virtual Network Driver - v1.0 > > > hidraw: raw HID events driver (C) Jiri Kosina > > > usbcore: registered new interface driver usbhid > > > usbhid: USB HID core driver > > > NET: Registered protocol family 40 > > > ashmem: initialized > > > NET: Registered protocol family 26 > > > Mirror/redirect action on > > > Simple TC action Loaded > > > netem: version 1.3 > > > u32 classifier > > > Actions configured > > > nf_conntrack_irc: failed to register helpers > > > nf_conntrack_sane: failed to register helpers > > > nf_conntrack_sip: failed to register helpers > > > xt_time: kernel timezone is -0000 > > > IPVS: Registered protocols (TCP, UDP, SCTP, AH, ESP) > > > IPVS: Connection hash table configured (size=4096, memory=64Kbytes) > > > IPVS: ipvs loaded. > > > IPVS: [rr] scheduler registered. > > > IPVS: [wrr] scheduler registered. > > > IPVS: [lc] scheduler registered. > > > IPVS: [wlc] scheduler registered. > > > IPVS: [fo] scheduler registered. > > > IPVS: [ovf] scheduler registered. > > > IPVS: [lblc] scheduler registered. > > > IPVS: [lblcr] scheduler registered. > > > IPVS: [dh] scheduler registered. > > > IPVS: [sh] scheduler registered. > > > IPVS: [mh] scheduler registered. > > > IPVS: [sed] scheduler registered. > > > IPVS: [nq] scheduler registered. > > > IPVS: ftp: loaded support on port[0] = 21 > > > IPVS: [sip] pe registered. > > > ipip: IPv4 and MPLS over IPv4 tunneling driver > > > gre: GRE over IPv4 demultiplexor driver > > > ip_gre: GRE over IPv4 tunneling driver > > > IPv4 over IPsec tunneling driver > > > ipt_CLUSTERIP: ClusterIP Version 0.8 loaded successfully > > > Initializing XFRM netlink socket > > > NET: Registered protocol family 10 > > > Segment Routing with IPv6 > > > mip6: Mobile IPv6 > > > sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver > > > ip6_gre: GRE over IPv6 tunneling driver > > > bpfilter: Loaded bpfilter_umh pid 2080 > > > NET: Registered protocol family 15 > > > Bridge firewalling registered > > > can: controller area network core (rev 20170425 abi 9) > > > NET: Registered protocol family 29 > > > can: raw protocol (rev 20170425) > > > can: broadcast manager protocol (rev 20170425 t) > > > can: netlink gateway (rev 20170425) max_hops=1 > > > Bluetooth: RFCOMM TTY layer initialized > > > Bluetooth: RFCOMM socket layer initialized > > > Bluetooth: RFCOMM ver 1.11 > > > Bluetooth: BNEP (Ethernet Emulation) ver 1.3 > > > Bluetooth: BNEP filters: protocol multicast > > > Bluetooth: BNEP socket layer initialized > > > Bluetooth: HIDP (Human Interface Emulation) ver 1.2 > > > Bluetooth: HIDP socket layer initialized > > > RPC: Registered rdma transport module. > > > RPC: Registered rdma backchannel transport module. > > > NET: Registered protocol family 41 > > > lec:lane_module_init: lec.c: initialized > > > mpoa:atm_mpoa_init: mpc.c: initialized > > > l2tp_core: L2TP core driver, V2.0 > > > l2tp_ppp: PPPoL2TP kernel driver, V2.0 > > > 8021q: 802.1Q VLAN Support v1.8 > > > input: AT Translated Set 2 keyboard as > > > /devices/platform/i8042/serio0/input/input2 > > > DCCP: Activated CCID 2 (TCP-like) > > > DCCP: Activated CCID 3 (TCP-Friendly Rate Control) > > > sctp: Hash tables configured (bind 64/64) > > > tipc: Activated (version 2.0.0) > > > NET: Registered protocol family 30 > > > tipc: Started in single node mode > > > NET: Registered protocol family 43 > > > 9pnet: Installing 9P2000 support > > > NET: Registered protocol family 36 > > > Key type dns_resolver registered > > > Key type ceph registered > > > libceph: loaded (mon/osd proto 15/24) > > > openvswitch: Open vSwitch switching datapath > > > mpls_gso: MPLS GSO support > > > start plist test > > > end plist test > > > AVX2 version of gcm_enc/dec engaged. > > > AES CTR mode by8 optimization enabled > > > sched_clock: Marking stable (4559438359, 0)->(6126385605, -1566947246) > > > registered taskstats version 1 > > > Loading compiled-in X.509 certificates > > > zswap: default zpool zbud not available > > > zswap: pool creation failed > > > Btrfs loaded, crc32c=crc32c-intel > > > Key type big_key registered > > > Key type encrypted registered > > > Magic number: 10:317:168 > > > console [netcon0] enabled > > > netconsole: network logging started > > > gtp: GTP module loaded (pdp ctx size 104 bytes) > > > rdma_rxe: loaded > > > cfg80211: Loading compiled-in X.509 certificates for regulatory database > > > cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7' > > > platform regulatory.0: Direct firmware load for regulatory.db failed with > > > error -2 > > > cfg80211: failed to load regulatory.db > > > ALSA device list: > > > #0: Dummy 1 > > > #1: Loopback 1 > > > #2: Virtual MIDI Card 1 > > > input: ImExPS/2 Generic Explorer Mouse as > > > /devices/platform/i8042/serio1/input/input4 > > > md: Waiting for all devices to be available before autodetect > > > md: If you don't use raid, use raid=noautodetect > > > md: Autodetecting RAID arrays. > > > md: autorun ... > > > md: ... autorun DONE. > > > EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: (null) > > > VFS: Mounted root (ext4 filesystem) readonly on device 8:1. > > > devtmpfs: mounted > > > Freeing unused kernel memory: 3900K > > > Kernel memory protection disabled. > > > SELinux: Disabled at runtime. > > > SELinux: Unregistering netfilter hooks > > > audit: type=1404 audit(1532588961.277:2): enforcing=0 old_enforcing=0 > > > auid=4294967295 ses=4294967295 enabled=0 old-enabled=1 lsm=selinux res=1 > > > stty (2166) used greatest stack depth: 19664 bytes left > > > EXT4-fs (sda1): re-mounted. Opts: (null) > > > logsave (3615) used greatest stack depth: 17632 bytes left > > > random: dd: uninitialized urandom read (512 bytes read) > > > =================================================================> > > BUG: KASAN: slab-out-of-bounds in virtnet_receive > > > drivers/net/virtio_net.c:1356 [inline] > > > > +virtio maintainers for this one > > Probably something very recent. > > > > > BUG: KASAN: slab-out-of-bounds in virtnet_poll+0x111a/0x1226 > > > drivers/net/virtio_net.c:1421 > > > Read of size 8 at addr ffff8801cee08ff0 by task ip/3969 > > > > > > CPU: 0 PID: 3969 Comm: ip Not tainted 4.18.0-rc6+ #141 > > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > > > Google 01/01/2011 > > > Call Trace: > > > <IRQ> > > > __dump_stack lib/dump_stack.c:77 [inline] > > > dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 > > > print_address_description+0x6c/0x20b mm/kasan/report.c:256 > > > kasan_report_error mm/kasan/report.c:354 [inline] > > > kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 > > > __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 > > > virtnet_receive drivers/net/virtio_net.c:1356 [inline] > > > virtnet_poll+0x111a/0x1226 drivers/net/virtio_net.c:1421 > > > napi_poll net/core/dev.c:6214 [inline] > > > net_rx_action+0x7a5/0x1920 net/core/dev.c:6280 > > > __do_softirq+0x2e8/0xb17 kernel/softirq.c:292 > > > do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1046 > > > </IRQ> > > > do_softirq.part.18+0x155/0x1a0 kernel/softirq.c:336 > > > do_softirq arch/x86/include/asm/preempt.h:23 [inline] > > > __local_bh_enable_ip+0x1ec/0x230 kernel/softirq.c:189 > > > local_bh_enable include/linux/bottom_half.h:32 [inline] > > > virtnet_napi_enable+0x8c/0xb0 drivers/net/virtio_net.c:1264 > > > virtnet_open+0x16d/0x4d0 drivers/net/virtio_net.c:1464 > > > __dev_open+0x26d/0x410 net/core/dev.c:1392 > > > __dev_change_flags+0x739/0x9c0 net/core/dev.c:7434 > > > dev_change_flags+0x89/0x150 net/core/dev.c:7503 > > > do_setlink+0xb16/0x3dd0 net/core/rtnetlink.c:2416 > > > rtnl_newlink+0x138d/0x1d60 net/core/rtnetlink.c:3029 > > > rtnetlink_rcv_msg+0x46e/0xc30 net/core/rtnetlink.c:4705 > > > netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2447 > > > rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4723 > > > netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] > > > netlink_unicast+0x5a0/0x760 net/netlink/af_netlink.c:1336 > > > netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1901 > > > sock_sendmsg_nosec net/socket.c:641 [inline] > > > sock_sendmsg+0xd5/0x120 net/socket.c:651 > > > ___sys_sendmsg+0x7fd/0x930 net/socket.c:2125 > > > __sys_sendmsg+0x11d/0x290 net/socket.c:2163 > > > __do_sys_sendmsg net/socket.c:2172 [inline] > > > __se_sys_sendmsg net/socket.c:2170 [inline] > > > __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2170 > > > do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 > > > entry_SYSCALL_64_after_hwframe+0x49/0xbe > > > RIP: 0033:0x7f318d594320 > > > Code: 02 48 83 c8 ff eb 8d 48 8b 05 14 7b 2a 00 f7 da 64 89 10 48 83 c8 ff > > > eb c9 90 83 3d d5 d2 2a 00 00 75 10 b8 2e 00 00 00 0f 05 <48> 3d 01 f0 ff ff > > > 73 31 c3 48 83 ec 08 e8 5e ba 00 00 48 89 04 24 > > > RSP: 002b:00007ffd985d8f38 EFLAGS: 00000246 ORIG_RAX: 000000000000002e > > > RAX: ffffffffffffffda RBX: 00007ffd985dd030 RCX: 00007f318d594320 > > > RDX: 0000000000000000 RSI: 00007ffd985d8f70 RDI: 0000000000000003 > > > RBP: 00007ffd985d8f70 R08: 0000000000000000 R09: 000000000000000f > > > R10: 0000000000000000 R11: 0000000000000246 R12: 000000005b5973aa > > > R13: 0000000000000000 R14: 00000000006395c0 R15: 00007ffd985dd808 > > > > > > Allocated by task 1: > > > save_stack+0x43/0xd0 mm/kasan/kasan.c:448 > > > set_track mm/kasan/kasan.c:460 [inline] > > > kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 > > > __do_kmalloc mm/slab.c:3718 [inline] > > > __kmalloc+0x14e/0x760 mm/slab.c:3727 > > > kmalloc_array include/linux/slab.h:635 [inline] > > > kcalloc include/linux/slab.h:646 [inline] > > > virtnet_alloc_queues drivers/net/virtio_net.c:2731 [inline] > > > init_vqs+0x127/0x1520 drivers/net/virtio_net.c:2769 > > > virtnet_probe+0x1092/0x2260 drivers/net/virtio_net.c:3016 > > > virtio_dev_probe+0x592/0x942 drivers/virtio/virtio.c:245 > > > really_probe drivers/base/dd.c:446 [inline] > > > driver_probe_device+0x6ad/0x970 drivers/base/dd.c:588 > > > __driver_attach+0x28b/0x2f0 drivers/base/dd.c:822 > > > bus_for_each_dev+0x15d/0x1f0 drivers/base/bus.c:311 > > > driver_attach+0x3d/0x50 drivers/base/dd.c:841 > > > bus_add_driver+0x4b2/0x600 drivers/base/bus.c:667 > > > driver_register+0x1c8/0x320 drivers/base/driver.c:170 > > > register_virtio_driver+0x79/0xd0 drivers/virtio/virtio.c:296 > > > virtio_net_driver_init+0x8d/0xc9 drivers/net/virtio_net.c:3209 > > > do_one_initcall+0x127/0x913 init/main.c:884 > > > do_initcall_level init/main.c:952 [inline] > > > do_initcalls init/main.c:960 [inline] > > > do_basic_setup init/main.c:978 [inline] > > > kernel_init_freeable+0x49b/0x58e init/main.c:1135 > > > kernel_init+0x11/0x1b3 init/main.c:1061 > > > ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 > > > > > > Freed by task 0: > > > (stack is not available) > > > > > > The buggy address belongs to the object at ffff8801cee08500 > > > which belongs to the cache kmalloc-4096 of size 4096 > > > The buggy address is located 2800 bytes inside of > > > 4096-byte region [ffff8801cee08500, ffff8801cee09500) > > > The buggy address belongs to the page: > > > page:ffffea00073b8200 count:1 mapcount:0 mapping:ffff8801dac00dc0 index:0x0 > > > compound_mapcount: 0 > > > flags: 0x2fffc0000008100(slab|head) > > > raw: 02fffc0000008100 ffffea00073b7d88 ffffea00073b8288 ffff8801dac00dc0 > > > raw: 0000000000000000 ffff8801cee08500 0000000100000001 0000000000000000 > > > page dumped because: kasan: bad access detected > > > > > > Memory state around the buggy address: > > > ffff8801cee08e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > > > ffff8801cee08f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > > >> > > >> ffff8801cee08f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > > > > > > ^ > > > ffff8801cee09000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > > > ffff8801cee09080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > > > =================================================================> > > > > > > > > --- > > > This bug is generated by a bot. It may contain errors. > > > See https://goo.gl/tpsmEJ for more information about syzbot. > > > syzbot engineers can be reached at syzkaller at googlegroups.com. > > > > > > syzbot will keep track of this bug report. See: > > > https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with > > > syzbot. > > > > > > -- > > > You received this message because you are subscribed to the Google Groups > > > "syzkaller-bugs" group. > > > To unsubscribe from this group and stop receiving emails from it, send an > > > email to syzkaller-bugs+unsubscribe at googlegroups.com. > > > To view this discussion on the web visit > > > https://groups.google.com/d/msgid/syzkaller-bugs/000000000000352dc20571e3a0d8%40google.com. > > > For more options, visit https://groups.google.com/d/optout.
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