[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 62.195630][ T24] audit: type=1800 audit(1559712447.910:25): pid=8757 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 62.237881][ T24] audit: type=1800 audit(1559712447.920:26): pid=8757 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 62.263662][ T24] audit: type=1800 audit(1559712447.920:27): pid=8757 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.7' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 74.835207][ T9129] WARNING: CPU: 1 PID: 9129 at drivers/media/common/videobuf2/videobuf2-core.c:1877 __vb2_queue_cancel+0x8b6/0xc80 [ 74.847649][ T9129] Kernel panic - not syncing: panic_on_warn set ... [ 74.862325][ T9129] CPU: 1 PID: 9129 Comm: syz-executor883 Not tainted 5.2.0-rc3+ #38 [ 74.870305][ T9129] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.880483][ T9129] Call Trace: [ 74.883805][ T9129] dump_stack+0x172/0x1f0 [ 74.888130][ T9129] ? __vb2_queue_cancel+0x800/0xc80 [ 74.893496][ T9129] panic+0x2cb/0x744 [ 74.897381][ T9129] ? __warn_printk+0xf3/0xf3 [ 74.901961][ T9129] ? __vb2_queue_cancel+0x8b6/0xc80 [ 74.907332][ T9129] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 74.913586][ T9129] ? __warn.cold+0x5/0x4d [ 74.917901][ T9129] ? __warn+0xe8/0x1d0 [ 74.921966][ T9129] ? __vb2_queue_cancel+0x8b6/0xc80 [ 74.927195][ T9129] __warn.cold+0x20/0x4d [ 74.931429][ T9129] ? __vb2_queue_cancel+0x8b6/0xc80 [ 74.936631][ T9129] report_bug+0x263/0x2b0 [ 74.940978][ T9129] do_error_trap+0x11b/0x200 [ 74.945574][ T9129] do_invalid_op+0x37/0x50 [ 74.949986][ T9129] ? __vb2_queue_cancel+0x8b6/0xc80 [ 74.955193][ T9129] invalid_op+0x14/0x20 [ 74.959348][ T9129] RIP: 0010:__vb2_queue_cancel+0x8b6/0xc80 [ 74.965164][ T9129] Code: 1e fb ff ff 48 89 df e8 48 bb ef fc e9 11 fb ff ff e8 0e 1d b7 fc 48 83 c4 50 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 fa 1c b7 fc <0f> 0b 48 8b 45 d0 48 05 28 02 00 00 48 89 c2 48 89 45 88 48 b8 00 [ 74.984823][ T9129] RSP: 0018:ffff888099d5f858 EFLAGS: 00010293 [ 74.990966][ T9129] RAX: ffff8880a89fc600 RBX: 0000000000000001 RCX: ffffffff84b9821e [ 74.999296][ T9129] RDX: 0000000000000000 RSI: ffffffff84b989b6 RDI: 0000000000000005 [ 75.007256][ T9129] RBP: ffff888099d5f8d0 R08: ffff8880a89fc600 R09: ffffed1013cdad26 [ 75.015322][ T9129] R10: ffffed1013cdad25 R11: ffff88809e6d692f R12: ffff88809e6d692c [ 75.023289][ T9129] R13: ffff88809e6d69c0 R14: ffff88809e6d66e8 R15: ffff88809e6d23c8 [ 75.031273][ T9129] ? __vb2_queue_cancel+0x11e/0xc80 [ 75.036481][ T9129] ? __vb2_queue_cancel+0x8b6/0xc80 [ 75.041701][ T9129] ? __vb2_queue_cancel+0x8b6/0xc80 [ 75.046928][ T9129] ? refcount_dec_and_test_checked+0x1b/0x20 [ 75.052907][ T9129] vb2_core_streamoff+0x60/0x150 [ 75.057967][ T9129] __vb2_cleanup_fileio+0x78/0x170 [ 75.063073][ T9129] vb2_core_queue_release+0x20/0x80 [ 75.068260][ T9129] _vb2_fop_release+0x1cf/0x2a0 [ 75.073104][ T9129] vb2_fop_release+0x75/0xc0 [ 75.077708][ T9129] vivid_fop_release+0x18e/0x430 [ 75.082643][ T9129] ? vidioc_querycap+0x2d0/0x2d0 [ 75.087569][ T9129] v4l2_release+0x21f/0x390 [ 75.092128][ T9129] __fput+0x2ff/0x890 [ 75.096104][ T9129] ? dev_debug_store+0x110/0x110 [ 75.101047][ T9129] ____fput+0x16/0x20 [ 75.105052][ T9129] task_work_run+0x145/0x1c0 [ 75.109725][ T9129] do_exit+0x90a/0x2fa0 [ 75.113881][ T9129] ? get_signal+0x387/0x24b0 [ 75.118462][ T9129] ? mm_update_next_owner+0x640/0x640 [ 75.123828][ T9129] ? kasan_check_write+0x14/0x20 [ 75.128760][ T9129] ? _raw_spin_unlock_irq+0x28/0x90 [ 75.133956][ T9129] ? get_signal+0x387/0x24b0 [ 75.138537][ T9129] ? _raw_spin_unlock_irq+0x28/0x90 [ 75.143729][ T9129] do_group_exit+0x135/0x370 [ 75.148306][ T9129] get_signal+0x471/0x24b0 [ 75.152821][ T9129] ? exit_robust_list+0x2c0/0x2c0 [ 75.157936][ T9129] ? mutex_unlock+0xd/0x10 [ 75.162349][ T9129] do_signal+0x87/0x1900 [ 75.166583][ T9129] ? __vfs_read+0x92/0x110 [ 75.170990][ T9129] ? v4l2_write+0x230/0x230 [ 75.175480][ T9129] ? setup_sigcontext+0x7d0/0x7d0 [ 75.180518][ T9129] ? exit_to_usermode_loop+0x43/0x2c0 [ 75.185878][ T9129] ? do_syscall_64+0x58e/0x680 [ 75.190705][ T9129] ? exit_to_usermode_loop+0x43/0x2c0 [ 75.196146][ T9129] ? lockdep_hardirqs_on+0x418/0x5d0 [ 75.201453][ T9129] ? trace_hardirqs_on+0x67/0x220 [ 75.206613][ T9129] exit_to_usermode_loop+0x244/0x2c0 [ 75.211923][ T9129] do_syscall_64+0x58e/0x680 [ 75.216511][ T9129] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 75.222398][ T9129] RIP: 0033:0x44a6b9 [ 75.226279][ T9129] Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b cb fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 75.245981][ T9129] RSP: 002b:00007f8db5816cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 75.254687][ T9129] RAX: 0000000000000001 RBX: 00000000006dbc38 RCX: 000000000044a6b9 [ 75.262791][ T9129] RDX: 000000000044a6b9 RSI: 0000000000000081 RDI: 00000000006dbc3c [ 75.270765][ T9129] RBP: 00000000006dbc30 R08: 0000000000000000 R09: 0000000000000000 [ 75.278915][ T9129] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc3c [ 75.287050][ T9129] R13: 00007ffc3d451e4f R14: 00007f8db58179c0 R15: 0000000000000001 [ 75.296737][ T9129] Kernel Offset: disabled [ 75.301200][ T9129] Rebooting in 86400 seconds..