[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 56.709979][ T26] audit: type=1800 audit(1559583085.888:25): pid=8444 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 56.748461][ T26] audit: type=1800 audit(1559583085.888:26): pid=8444 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 56.788471][ T26] audit: type=1800 audit(1559583085.888:27): pid=8444 uid=0 auid=4294967295 ses=4294967295 subj=_ 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 '10.128.0.61' (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 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 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: [ 67.956483][ T9123] WARNING: CPU: 1 PID: 9123 at drivers/media/common/videobuf2/videobuf2-core.c:1877 __vb2_queue_cancel+0x8b6/0xc80 [ 67.968740][ T9123] Kernel panic - not syncing: panic_on_warn set ... [ 67.975323][ T9123] CPU: 1 PID: 9123 Comm: syz-executor345 Not tainted 5.2.0-rc3 #18 [ 67.983197][ T9123] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.993235][ T9123] Call Trace: [ 67.996511][ T9123] dump_stack+0x172/0x1f0 [ 68.000870][ T9123] ? __vb2_queue_cancel+0x800/0xc80 [ 68.006069][ T9123] panic+0x2cb/0x744 [ 68.009952][ T9123] ? __warn_printk+0xf3/0xf3 [ 68.014524][ T9123] ? __vb2_queue_cancel+0x8b6/0xc80 [ 68.019699][ T9123] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 68.025937][ T9123] ? __warn.cold+0x5/0x4d [ 68.030256][ T9123] ? __warn+0xe8/0x1d0 [ 68.034304][ T9123] ? __vb2_queue_cancel+0x8b6/0xc80 [ 68.039479][ T9123] __warn.cold+0x20/0x4d [ 68.043716][ T9123] ? __vb2_queue_cancel+0x8b6/0xc80 [ 68.048895][ T9123] report_bug+0x263/0x2b0 [ 68.054173][ T9123] do_error_trap+0x11b/0x200 [ 68.058771][ T9123] do_invalid_op+0x37/0x50 [ 68.063177][ T9123] ? __vb2_queue_cancel+0x8b6/0xc80 [ 68.068368][ T9123] invalid_op+0x14/0x20 [ 68.072501][ T9123] RIP: 0010:__vb2_queue_cancel+0x8b6/0xc80 [ 68.078301][ T9123] 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 [ 68.097973][ T9123] RSP: 0018:ffff888085ca7858 EFLAGS: 00010293 [ 68.104016][ T9123] RAX: ffff88809508e140 RBX: 0000000000000001 RCX: ffffffff84b9821e [ 68.111966][ T9123] RDX: 0000000000000000 RSI: ffffffff84b989b6 RDI: 0000000000000005 [ 68.119919][ T9123] RBP: ffff888085ca78d0 R08: ffff88809508e140 R09: ffffed10430a6d26 [ 68.127869][ T9123] R10: ffffed10430a6d25 R11: ffff88821853692f R12: ffff88821853692c [ 68.135816][ T9123] R13: ffff8882185369c0 R14: ffff8882185366e8 R15: ffff8882185323c8 [ 68.143791][ T9123] ? __vb2_queue_cancel+0x11e/0xc80 [ 68.148974][ T9123] ? __vb2_queue_cancel+0x8b6/0xc80 [ 68.154170][ T9123] ? __vb2_queue_cancel+0x8b6/0xc80 [ 68.159356][ T9123] ? refcount_dec_and_test_checked+0x1b/0x20 [ 68.165331][ T9123] vb2_core_streamoff+0x60/0x150 [ 68.170249][ T9123] __vb2_cleanup_fileio+0x78/0x170 [ 68.175345][ T9123] vb2_core_queue_release+0x20/0x80 [ 68.180529][ T9123] _vb2_fop_release+0x1cf/0x2a0 [ 68.185385][ T9123] vb2_fop_release+0x75/0xc0 [ 68.189963][ T9123] vivid_fop_release+0x18e/0x430 [ 68.194881][ T9123] ? vidioc_querycap+0x2d0/0x2d0 [ 68.199806][ T9123] v4l2_release+0x21f/0x390 [ 68.204306][ T9123] __fput+0x2ff/0x890 [ 68.208268][ T9123] ? dev_debug_store+0x110/0x110 [ 68.213184][ T9123] ____fput+0x16/0x20 [ 68.217144][ T9123] task_work_run+0x145/0x1c0 [ 68.221719][ T9123] do_exit+0x90a/0x2fa0 [ 68.225856][ T9123] ? get_signal+0x387/0x24b0 [ 68.230423][ T9123] ? mm_update_next_owner+0x640/0x640 [ 68.235774][ T9123] ? kasan_check_write+0x14/0x20 [ 68.240707][ T9123] ? _raw_spin_unlock_irq+0x28/0x90 [ 68.245911][ T9123] ? get_signal+0x387/0x24b0 [ 68.252247][ T9123] ? _raw_spin_unlock_irq+0x28/0x90 [ 68.257429][ T9123] do_group_exit+0x135/0x370 [ 68.262000][ T9123] get_signal+0x471/0x24b0 [ 68.266394][ T9123] ? exit_robust_list+0x2c0/0x2c0 [ 68.271419][ T9123] do_signal+0x87/0x1900 [ 68.275666][ T9123] ? putname+0xef/0x130 [ 68.279825][ T9123] ? putname+0xef/0x130 [ 68.284231][ T9123] ? rcu_read_lock_sched_held+0x110/0x130 [ 68.290019][ T9123] ? kmem_cache_free+0x222/0x260 [ 68.294952][ T9123] ? setup_sigcontext+0x7d0/0x7d0 [ 68.299959][ T9123] ? putname+0xf4/0x130 [ 68.304099][ T9123] ? exit_to_usermode_loop+0x43/0x2c0 [ 68.309447][ T9123] ? do_syscall_64+0x58e/0x680 [ 68.314212][ T9123] ? exit_to_usermode_loop+0x43/0x2c0 [ 68.319562][ T9123] ? lockdep_hardirqs_on+0x418/0x5d0 [ 68.324823][ T9123] ? trace_hardirqs_on+0x67/0x220 [ 68.329833][ T9123] exit_to_usermode_loop+0x244/0x2c0 [ 68.335096][ T9123] do_syscall_64+0x58e/0x680 [ 68.339665][ T9123] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 68.345547][ T9123] RIP: 0033:0x44a6b9 [ 68.349420][ T9123] 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 [ 68.368996][ T9123] RSP: 002b:00007faca024bcf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 68.377381][ T9123] RAX: fffffffffffffe00 RBX: 00000000006dbc28 RCX: 000000000044a6b9 [ 68.385326][ T9123] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc28 [ 68.393273][ T9123] RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000 [ 68.401226][ T9123] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c [ 68.409181][ T9123] R13: 00007ffd4963e8cf R14: 00007faca024c9c0 R15: 0000000000000000 [ 68.418536][ T9123] Kernel Offset: disabled [ 68.422910][ T9123] Rebooting in 86400 seconds..