[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 40.012155] audit: type=1800 audit(1546537102.072:25): pid=7724 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 40.051703] audit: type=1800 audit(1546537102.082:26): pid=7724 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 40.075768] audit: type=1800 audit(1546537102.082:27): pid=7724 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 '10.128.0.101' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 50.443949] WARNING: CPU: 0 PID: 7885 at drivers/media/common/videobuf2/videobuf2-core.c:1852 __vb2_queue_cancel+0x8f1/0xd30 [ 50.455425] Kernel panic - not syncing: panic_on_warn set ... [ 50.461296] CPU: 0 PID: 7885 Comm: syz-executor290 Not tainted 4.20.0-next-20190103 #4 [ 50.469331] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.478687] Call Trace: [ 50.481258] dump_stack+0x1db/0x2d0 [ 50.484870] ? dump_stack_print_info.cold+0x20/0x20 [ 50.489890] ? __vb2_queue_cancel+0x850/0xd30 [ 50.494410] panic+0x2cb/0x65c [ 50.497861] ? add_taint.cold+0x16/0x16 [ 50.501828] ? __vb2_queue_cancel+0x8f1/0xd30 [ 50.506331] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.511885] ? __probe_kernel_read+0x1f4/0x250 [ 50.516459] ? __warn.cold+0x5/0x48 [ 50.520071] ? __warn+0xe8/0x1d0 [ 50.523454] ? __vb2_queue_cancel+0x8f1/0xd30 [ 50.527962] __warn.cold+0x20/0x48 [ 50.531506] ? __vb2_queue_cancel+0x8f1/0xd30 [ 50.535984] report_bug+0x263/0x2b0 [ 50.539609] do_error_trap+0x11b/0x200 [ 50.543498] do_invalid_op+0x37/0x50 [ 50.547199] ? __vb2_queue_cancel+0x8f1/0xd30 [ 50.551677] invalid_op+0x14/0x20 [ 50.555122] RIP: 0010:__vb2_queue_cancel+0x8f1/0xd30 [ 50.560224] Code: 48 8b 45 d0 65 48 33 04 25 28 00 00 00 0f 85 15 04 00 00 48 81 c4 18 01 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 5f d1 3e fc <0f> 0b 49 8d 87 28 02 00 00 48 89 85 d0 fe ff ff 48 c1 e8 03 42 0f [ 50.579150] RSP: 0018:ffff88808ae3f938 EFLAGS: 00010293 [ 50.584502] RAX: ffff88808fbb8300 RBX: ffff88808ae3fa50 RCX: ffffffff8542c772 [ 50.591756] RDX: 0000000000000000 RSI: ffffffff8542cea1 RDI: 0000000000000005 [ 50.599019] RBP: ffff88808ae3fa78 R08: ffff88808fbb8300 R09: ffffed1013bcce9b [ 50.606292] R10: ffffed1013bcce9a R11: ffff88809de674d7 R12: ffff88809de674d4 [ 50.613570] R13: dffffc0000000000 R14: 0000000000000001 R15: ffff88809de67290 [ 50.620852] ? __vb2_queue_cancel+0x1c2/0xd30 [ 50.625335] ? __vb2_queue_cancel+0x8f1/0xd30 [ 50.629823] ? __vb2_queue_cancel+0x8f1/0xd30 [ 50.634304] ? kasan_check_read+0x11/0x20 [ 50.638439] ? do_raw_spin_unlock+0xa0/0x330 [ 50.642842] ? vb2_buffer_done+0xc90/0xc90 [ 50.647075] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 50.652162] ? kasan_check_write+0x14/0x20 [ 50.656419] ? wake_up_q+0xaa/0x100 [ 50.660060] ? __mutex_unlock_slowpath+0x420/0x870 [ 50.664978] vb2_core_streamoff+0x60/0x140 [ 50.669205] __vb2_cleanup_fileio+0x78/0x170 [ 50.673601] vb2_core_queue_release+0x20/0x80 [ 50.678080] _vb2_fop_release+0x1cf/0x2a0 [ 50.682213] vb2_fop_release+0x75/0xc0 [ 50.686086] vivid_fop_release+0x18e/0x430 [ 50.690328] ? vivid_remove+0x460/0x460 [ 50.694302] v4l2_release+0x224/0x3a0 [ 50.698090] __fput+0x3c5/0xb10 [ 50.701395] ? dev_debug_store+0x150/0x150 [ 50.705639] ? file_free_rcu+0xe0/0xe0 [ 50.709512] ? task_work_run+0x1bb/0x2b0 [ 50.713567] ? trace_hardirqs_off_caller+0x300/0x300 [ 50.718664] ? do_raw_spin_trylock+0x270/0x270 [ 50.723255] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.728795] ____fput+0x16/0x20 [ 50.732059] task_work_run+0x1f4/0x2b0 [ 50.735934] ? task_work_cancel+0x2c0/0x2c0 [ 50.740257] ? __close_fd+0x25f/0x3d0 [ 50.744056] ? do_syscall_64+0x8c/0x800 [ 50.748019] exit_to_usermode_loop+0x32a/0x3b0 [ 50.752596] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.757944] ? syscall_trace_enter+0x12a0/0x12a0 [ 50.762684] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 50.767432] do_syscall_64+0x696/0x800 [ 50.771307] ? syscall_return_slowpath+0x5f0/0x5f0 [ 50.776245] ? prepare_exit_to_usermode+0x232/0x3b0 [ 50.781264] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 50.786113] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.791288] RIP: 0033:0x400ef0 [ 50.794467] Code: 01 f0 ff ff 0f 83 b0 0a 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d dd 57 2d 00 00 75 14 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 84 0a 00 00 c3 48 83 ec 08 e8 3a 01 00 00 [ 50.813351] RSP: 002b:00007ffe17c97918 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 50.821064] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000400ef0 [ 50.828328] RDX: 00000000fffffdf5 RSI: 0000000020000240 RDI: 0000000000000003 [ 50.835578] RBP: 0000000000000000 R08: 00000000007cb880 R09: 00000000004002e0 [ 50.842830] R10: 000000000000000f R11: 0000000000000246 R12: 0000000000401e00 [ 50.850084] R13: 0000000000401e90 R14: 0000000000000000 R15: 0000000000000000 [ 50.858452] Kernel Offset: disabled [ 50.862117] Rebooting in 86400 seconds..