[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 39.481380] audit: type=1800 audit(1547660913.688:25): pid=7726 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 39.509476] audit: type=1800 audit(1547660913.688:26): pid=7726 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 39.537679] audit: type=1800 audit(1547660913.688:27): pid=7726 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 '10.128.0.254' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 51.063993] WARNING: CPU: 0 PID: 7886 at drivers/media/common/videobuf2/videobuf2-core.c:1852 __vb2_queue_cancel+0x8f1/0xd30 [ 51.075411] Kernel panic - not syncing: panic_on_warn set ... [ 51.081277] CPU: 0 PID: 7886 Comm: syz-executor371 Not tainted 5.0.0-rc2+ #28 [ 51.088544] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.097882] Call Trace: [ 51.100454] dump_stack+0x1db/0x2d0 [ 51.104059] ? dump_stack_print_info.cold+0x20/0x20 [ 51.109072] ? __vb2_queue_cancel+0x880/0xd30 [ 51.113580] panic+0x2cb/0x65c [ 51.116775] ? add_taint.cold+0x16/0x16 [ 51.120764] ? __vb2_queue_cancel+0x8f1/0xd30 [ 51.125260] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.130782] ? __probe_kernel_read+0x1f4/0x250 [ 51.135343] ? __warn.cold+0x5/0x48 [ 51.138947] ? __warn+0xe8/0x1d0 [ 51.142320] ? __vb2_queue_cancel+0x8f1/0xd30 [ 51.146811] __warn.cold+0x20/0x48 [ 51.150328] ? __vb2_queue_cancel+0x8f1/0xd30 [ 51.154809] report_bug+0x263/0x2b0 [ 51.158447] do_error_trap+0x11b/0x200 [ 51.162314] do_invalid_op+0x37/0x50 [ 51.166022] ? __vb2_queue_cancel+0x8f1/0xd30 [ 51.170517] invalid_op+0x14/0x20 [ 51.173965] RIP: 0010:__vb2_queue_cancel+0x8f1/0xd30 [ 51.179072] 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 7f 9b 3f fc <0f> 0b 49 8d 87 28 02 00 00 48 89 85 d0 fe ff ff 48 c1 e8 03 42 0f [ 51.197946] RSP: 0018:ffff8880873df938 EFLAGS: 00010293 [ 51.203308] RAX: ffff8880870ac140 RBX: ffff8880873dfa50 RCX: ffffffff85425c42 [ 51.210569] RDX: 0000000000000000 RSI: ffffffff85426371 RDI: 0000000000000005 [ 51.217815] RBP: ffff8880873dfa78 R08: ffff8880870ac140 R09: ffffed1013c26cf1 [ 51.225066] R10: ffffed1013c26cf0 R11: ffff88809e136787 R12: ffff88809e136784 [ 51.232312] R13: dffffc0000000000 R14: 0000000000000002 R15: ffff88809e136540 [ 51.239565] ? __vb2_queue_cancel+0x1c2/0xd30 [ 51.244055] ? __vb2_queue_cancel+0x8f1/0xd30 [ 51.248544] ? __vb2_queue_cancel+0x8f1/0xd30 [ 51.253035] ? kasan_check_read+0x11/0x20 [ 51.257192] ? do_raw_spin_unlock+0xa0/0x330 [ 51.261625] ? vb2_buffer_done+0xc90/0xc90 [ 51.265852] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 51.270944] ? kasan_check_write+0x14/0x20 [ 51.275168] ? wake_up_q+0xaa/0x100 [ 51.278784] ? __mutex_unlock_slowpath+0x420/0x870 [ 51.283693] vb2_core_streamoff+0x60/0x140 [ 51.287916] __vb2_cleanup_fileio+0x78/0x170 [ 51.292348] vb2_core_queue_release+0x20/0x80 [ 51.296859] _vb2_fop_release+0x1cf/0x2a0 [ 51.300991] vb2_fop_release+0x75/0xc0 [ 51.304864] vivid_fop_release+0x18e/0x430 [ 51.309107] ? vivid_remove+0x460/0x460 [ 51.313059] v4l2_release+0x224/0x3a0 [ 51.316840] __fput+0x3c5/0xb10 [ 51.320103] ? dev_debug_store+0x150/0x150 [ 51.324315] ? get_max_files+0x20/0x20 [ 51.328179] ? task_work_run+0x1bb/0x2b0 [ 51.332248] ? trace_hardirqs_off_caller+0x300/0x300 [ 51.337329] ? do_raw_spin_trylock+0x270/0x270 [ 51.341892] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.347408] ____fput+0x16/0x20 [ 51.350665] task_work_run+0x1f4/0x2b0 [ 51.354541] ? task_work_cancel+0x2c0/0x2c0 [ 51.359008] ? __close_fd+0x25f/0x3d0 [ 51.362801] ? do_syscall_64+0x8c/0x800 [ 51.366774] exit_to_usermode_loop+0x32a/0x3b0 [ 51.371358] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 51.376708] ? syscall_trace_enter+0x12a0/0x12a0 [ 51.381452] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 51.386199] do_syscall_64+0x696/0x800 [ 51.390067] ? syscall_return_slowpath+0x5f0/0x5f0 [ 51.394992] ? prepare_exit_to_usermode+0x232/0x3b0 [ 51.400003] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 51.404829] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 51.409995] RIP: 0033:0x400ef0 [ 51.413165] 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 [ 51.432060] RSP: 002b:00007fff297d1f48 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 51.439790] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000400ef0 [ 51.447037] RDX: 00000000000ca800 RSI: 0000000020000000 RDI: 0000000000000003 [ 51.454287] RBP: 0000000000000000 R08: 0000000002610880 R09: 00000000004002e0 [ 51.461561] R10: 000000000000000f R11: 0000000000000246 R12: 0000000000401e00 [ 51.468835] R13: 0000000000401e90 R14: 0000000000000000 R15: 0000000000000000 [ 51.480224] Kernel Offset: disabled [ 51.483879] Rebooting in 86400 seconds..