Hi, I'm getting a huge number of warning reports while fuzzing the kernel with syzkaller. Unfortunately they are not reproducible. On commit e5d56efc97f8240d0b5d66c03949382b6d7e5570 (Feb 26). My .config is attached. WARNING: CPU: 1 PID: 6203 at net/bridge/br_fdb.c:109 br_fdb_find+0x20c/0x220 net/bridge/br_fdb.c:109 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 6203 Comm: syz-executor0 Not tainted 4.10.0+ #54 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:15 [inline] dump_stack+0x292/0x398 lib/dump_stack.c:51 panic+0x1cb/0x3a9 kernel/panic.c:179 __warn+0x1c4/0x1e0 kernel/panic.c:540 warn_slowpath_null+0x2c/0x40 kernel/panic.c:583 br_fdb_find+0x20c/0x220 net/bridge/br_fdb.c:109 fdb_insert+0xf7/0x300 net/bridge/br_fdb.c:529 br_fdb_insert+0x3a/0x60 net/bridge/br_fdb.c:557 __vlan_add+0x1621/0x3670 net/bridge/br_vlan.c:250 br_vlan_add+0x9e1/0xf30 net/bridge/br_vlan.c:599 br_vlan_init+0x241/0x320 net/bridge/br_vlan.c:940 br_dev_init+0xe2/0x220 net/bridge/br_device.c:106 register_netdevice+0x2f1/0xee0 net/core/dev.c:7137 register_netdev+0x1a/0x30 net/core/dev.c:7313 br_add_bridge+0x97/0xd0 net/bridge/br_if.c:393 br_ioctl_deviceless_stub+0x800/0xa40 net/bridge/br_ioctl.c:378 sock_ioctl+0x256/0x440 net/socket.c:960 vfs_ioctl fs/ioctl.c:43 [inline] do_vfs_ioctl+0x1bf/0x1780 fs/ioctl.c:683 SYSC_ioctl fs/ioctl.c:698 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:689 entry_SYSCALL_64_fastpath+0x1f/0xc2 RIP: 0033:0x4458b9 RSP: 002b:00007f4afad8fb58 EFLAGS: 00000286 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000004458b9 RDX: 0000000020000000 RSI: 01400000000089a0 RDI: 0000000000000005 RBP: 00000000006e0be0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000708000 R13: 0000000000000010 R14: 0000000000080003 R15: 0000000000000000 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds.. -------------- next part -------------- A non-text attachment was scrubbed... Name: .config Type: application/octet-stream Size: 127212 bytes Desc: not available URL: <http://lists.linuxfoundation.org/pipermail/bridge/attachments/20170227/f1eb79e9/attachment-0001.obj>
On Mon, Feb 27, 2017 at 4:33 PM, Andrey Konovalov <andreyknvl at google.com> wrote:> Hi, > > I'm getting a huge number of warning reports while fuzzing the kernel > with syzkaller. > Unfortunately they are not reproducible. > > On commit e5d56efc97f8240d0b5d66c03949382b6d7e5570 (Feb 26). > > My .config is attached. > > WARNING: CPU: 1 PID: 6203 at net/bridge/br_fdb.c:109 > br_fdb_find+0x20c/0x220 net/bridge/br_fdb.c:109 > Kernel panic - not syncing: panic_on_warn set ... > > CPU: 1 PID: 6203 Comm: syz-executor0 Not tainted 4.10.0+ #54 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:15 [inline] > dump_stack+0x292/0x398 lib/dump_stack.c:51 > panic+0x1cb/0x3a9 kernel/panic.c:179 > __warn+0x1c4/0x1e0 kernel/panic.c:540 > warn_slowpath_null+0x2c/0x40 kernel/panic.c:583 > br_fdb_find+0x20c/0x220 net/bridge/br_fdb.c:109 > fdb_insert+0xf7/0x300 net/bridge/br_fdb.c:529 > br_fdb_insert+0x3a/0x60 net/bridge/br_fdb.c:557 > __vlan_add+0x1621/0x3670 net/bridge/br_vlan.c:250 > br_vlan_add+0x9e1/0xf30 net/bridge/br_vlan.c:599 > br_vlan_init+0x241/0x320 net/bridge/br_vlan.c:940 > br_dev_init+0xe2/0x220 net/bridge/br_device.c:106 > register_netdevice+0x2f1/0xee0 net/core/dev.c:7137 > register_netdev+0x1a/0x30 net/core/dev.c:7313 > br_add_bridge+0x97/0xd0 net/bridge/br_if.c:393 > br_ioctl_deviceless_stub+0x800/0xa40 net/bridge/br_ioctl.c:378 > sock_ioctl+0x256/0x440 net/socket.c:960 > vfs_ioctl fs/ioctl.c:43 [inline] > do_vfs_ioctl+0x1bf/0x1780 fs/ioctl.c:683 > SYSC_ioctl fs/ioctl.c:698 [inline] > SyS_ioctl+0x8f/0xc0 fs/ioctl.c:689 > entry_SYSCALL_64_fastpath+0x1f/0xc2 > RIP: 0033:0x4458b9 > RSP: 002b:00007f4afad8fb58 EFLAGS: 00000286 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000004458b9 > RDX: 0000000020000000 RSI: 01400000000089a0 RDI: 0000000000000005 > RBP: 00000000006e0be0 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000708000 > R13: 0000000000000010 R14: 0000000000080003 R15: 0000000000000000 > Dumping ftrace buffer: > (ftrace buffer empty) > Kernel Offset: disabled > Rebooting in 86400 seconds..+syzkaller at googlegroups.com