Michael S. Tsirkin
2022-Oct-16 07:36 UTC
[syzbot] net boot error: WARNING in cpumask_next_wrap
On Sat, Oct 15, 2022 at 12:21:41PM -0700, syzbot wrote:> Hello, > > syzbot found the following issue on: > > HEAD commit: a1b6b102df03 Merge branch 'phylink_set_mac_pm' > git tree: net > console output: https://syzkaller.appspot.com/x/log.txt?x=179af0c2880000 > kernel config: https://syzkaller.appspot.com/x/.config?x=85495c44a2c25446 > dashboard link: https://syzkaller.appspot.com/bug?extid=4d0c5794bff07852726c > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/d67c9cef7c77/disk-a1b6b102.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/708d1f638584/vmlinux-a1b6b102.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+4d0c5794bff07852726c at syzkaller.appspotmail.com > > ACPI: button: Sleep Button [SLPF] > ACPI: \_SB_.LNKC: Enabled at IRQ 11 > virtio-pci 0000:00:03.0: virtio_pci: leaving for legacy driver > ACPI: \_SB_.LNKD: Enabled at IRQ 10 > virtio-pci 0000:00:04.0: virtio_pci: leaving for legacy driver > ACPI: \_SB_.LNKB: Enabled at IRQ 10 > virtio-pci 0000:00:06.0: virtio_pci: leaving for legacy driver > virtio-pci 0000:00:07.0: virtio_pci: leaving for legacy driver > N_HDLC line discipline registered with maxframe=4096 > Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled > 00:03: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A > 00:04: ttyS1 at I/O 0x2f8 (irq = 3, base_baud = 115200) is a 16550A > 00:05: ttyS2 at I/O 0x3e8 (irq = 6, base_baud = 115200) is a 16550A > 00:06: ttyS3 at I/O 0x2e8 (irq = 7, base_baud = 115200) is a 16550A > Non-volatile memory driver v1.3 > Linux agpgart interface v0.103 > ACPI: bus type drm_connector registered > [drm] Initialized vgem 1.0.0 20120112 for vgem on minor 0 > [drm] Initialized vkms 1.0.0 20180514 for vkms on minor 1 > Console: switching to colour frame buffer device 128x48 > platform vkms: [drm] fb0: vkmsdrmfb frame buffer device > usbcore: registered new interface driver udl > brd: module loaded > loop: module loaded > zram: Added device: zram0 > null_blk: disk nullb0 created > null_blk: module loaded > Guest personality initialized and is inactive > VMCI host device registered (name=vmci, major=10, minor=119) > Initialized host personality > usbcore: registered new interface driver rtsx_usb > usbcore: registered new interface driver viperboard > usbcore: registered new interface driver dln2 > usbcore: registered new interface driver pn533_usb > nfcsim 0.2 initialized > usbcore: registered new interface driver port100 > usbcore: registered new interface driver nfcmrvl > Loading iSCSI transport class v2.0-870. > scsi host0: Virtio SCSI HBA > st: Version 20160209, fixed bufsize 32768, s/g segs 256 > Rounding down aligned max_sectors from 4294967295 to 4294967288 > db_root: cannot open: /etc/target > slram: not enough parameters. > ftl_cs: FTL header not found. > wireguard: WireGuard 1.0.0 loaded. See www.wireguard.com for information. > wireguard: Copyright (C) 2015-2019 Jason A. Donenfeld <Jason at zx2c4.com>. All Rights Reserved. > eql: Equalizer2002: Simon Janes (simon at ncm.com) and David S. Miller (davem at redhat.com) > MACsec IEEE 802.1AE > tun: Universal TUN/TAP device driver, 1.6 > ------------[ cut here ]------------ > WARNING: CPU: 0 PID: 1 at include/linux/cpumask.h:110 cpu_max_bits_warn include/linux/cpumask.h:110 [inline] > WARNING: CPU: 0 PID: 1 at include/linux/cpumask.h:110 cpumask_check include/linux/cpumask.h:117 [inline] > WARNING: CPU: 0 PID: 1 at include/linux/cpumask.h:110 cpumask_next include/linux/cpumask.h:178 [inline] > WARNING: CPU: 0 PID: 1 at include/linux/cpumask.h:110 cpumask_next_wrap+0x139/0x1d0 lib/cpumask.c:27 > Modules linked in: > CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.0.0-syzkaller-11847-ga1b6b102df03 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 > RIP: 0010:cpu_max_bits_warn include/linux/cpumask.h:110 [inline] > RIP: 0010:cpumask_check include/linux/cpumask.h:117 [inline] > RIP: 0010:cpumask_next include/linux/cpumask.h:178 [inline] > RIP: 0010:cpumask_next_wrap+0x139/0x1d0 lib/cpumask.c:27 > Code: df e8 8b 4a 3d f8 39 eb 77 64 e8 32 4e 3d f8 41 8d 6c 24 01 89 de 89 ef e8 74 4a 3d f8 39 dd 0f 82 54 ff ff ff e8 17 4e 3d f8 <0f> 0b e9 48 ff ff ff e8 0b 4e 3d f8 48 c7 c2 00 02 e2 8d 48 b8 00 > RSP: 0000:ffffc90000067920 EFLAGS: 00010293 > RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000000 > RDX: ffff88813fe50000 RSI: ffffffff893f1c59 RDI: 0000000000000004 > RBP: 0000000000000002 R08: 0000000000000004 R09: 0000000000000002 > R10: 0000000000000002 R11: 0000000000000000 R12: 0000000000000001 > R13: 0000000000000000 R14: 0000000000000002 R15: ffffffff8de20010 > FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: ffff88823ffff000 CR3: 000000000bc8e000 CR4: 00000000003506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <TASK> > virtnet_set_affinity+0x35a/0x750 drivers/net/virtio_net.c:2303 > init_vqs drivers/net/virtio_net.c:3581 [inline] > init_vqs drivers/net/virtio_net.c:3567 [inline] > virtnet_probe+0x12ae/0x31e0 drivers/net/virtio_net.c:3884 > virtio_dev_probe+0x577/0x870 drivers/virtio/virtio.c:305 > call_driver_probe drivers/base/dd.c:560 [inline] > really_probe+0x249/0xb90 drivers/base/dd.c:639 > __driver_probe_device+0x1df/0x4d0 drivers/base/dd.c:778 > driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:808 > __driver_attach+0x1d0/0x550 drivers/base/dd.c:1190 > bus_for_each_dev+0x147/0x1d0 drivers/base/bus.c:301 > bus_add_driver+0x4c9/0x640 drivers/base/bus.c:618 > driver_register+0x220/0x3a0 drivers/base/driver.c:246 > virtio_net_driver_init+0x93/0xd2 drivers/net/virtio_net.c:4090 > do_one_initcall+0x13d/0x780 init/main.c:1303 > do_initcall_level init/main.c:1376 [inline] > do_initcalls init/main.c:1392 [inline] > do_basic_setup init/main.c:1411 [inline] > kernel_init_freeable+0x6ff/0x788 init/main.c:1631 > kernel_init+0x1a/0x1d0 init/main.c:1519 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 > </TASK>#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master figure out why is syzbot triggering warnings Signed-off-by: Michael S. Tsirkin <mst at redhat.com> --- drivers/net/virtio_net.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 7106932c6f88..3c1c16b43bbd 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -2295,13 +2295,20 @@ static void virtnet_set_affinity(struct virtnet_info *vi) 0; cpu = cpumask_first(cpu_online_mask); + printk(KERN_ERR "%s +%d : %s cpu %d num %d stride %d stragglers %d\n", + __FILE__, __LINE__, __func__, cpu, num_cpu, stride, stragglers); + for (i = 0; i < vi->curr_queue_pairs; i++) { group_size = stride + (i < stragglers ? 1 : 0); + printk(KERN_ERR "%s +%d : %s vq %d group_size %d", + __FILE__, __LINE__, __func__, i, group_size); for (j = 0; j < group_size; j++) { cpumask_set_cpu(cpu, mask); cpu = cpumask_next_wrap(cpu, cpu_online_mask, nr_cpu_ids, false); + printk(KERN_ERR "%s +%d : %s groupindex %d cpu %d", + __FILE__, __LINE__, __func__, j, group_size); } virtqueue_set_affinity(vi->rq[i].vq, mask); virtqueue_set_affinity(vi->sq[i].vq, mask); -- MST
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