[info] Using makefile-style concurrent boot in runlevel 2. [ 24.427837] audit: type=1800 audit(1540955449.333:21): pid=5486 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2419 res=0 [ 24.455608] audit: type=1800 audit(1540955449.343:22): pid=5486 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2447 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] 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 syzkaller login: [ 61.331431] sshd (5629) used greatest stack depth: 15744 bytes left Warning: Permanently added '10.128.0.63' (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 [ 67.972320] ================================================================== [ 67.979860] BUG: KASAN: null-ptr-deref in kthread_stop+0x108/0x8f0 [ 67.986198] Write of size 4 at addr 0000000000000020 by task syz-executor789/5655 [ 67.993818] [ 67.995464] CPU: 1 PID: 5655 Comm: syz-executor789 Not tainted 4.19.0-next-20181030+ #101 [ 68.003786] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.013141] Call Trace: [ 68.015745] dump_stack+0x244/0x39d [ 68.019389] ? dump_stack_print_info.cold.1+0x20/0x20 [ 68.024593] ? vprintk_func+0x85/0x181 [ 68.028507] kasan_report.cold.8+0x6d/0x309 [ 68.032844] ? kthread_stop+0x108/0x8f0 [ 68.036836] check_memory_region+0x13e/0x1b0 [ 68.041253] kasan_check_write+0x14/0x20 [ 68.045320] kthread_stop+0x108/0x8f0 [ 68.049136] ? kthread_unpark+0x160/0x160 [ 68.053301] ? __lock_is_held+0xb5/0x140 [ 68.057396] vivid_stop_generating_vid_cap+0x2bc/0x93b [ 68.062695] ? vivid_start_generating_vid_cap+0x4c0/0x4c0 [ 68.068244] ? _vb2_fop_release+0x3f/0x2b0 [ 68.072512] ? mutex_trylock+0x2b0/0x2b0 [ 68.076585] ? vivid_fop_release+0x66/0x440 [ 68.080932] vid_cap_stop_streaming+0x8d/0xe0 [ 68.085435] ? vid_cap_buf_queue+0x310/0x310 [ 68.089853] __vb2_queue_cancel+0x171/0xca0 [ 68.094190] ? lock_downgrade+0x900/0x900 [ 68.098351] ? __vb2_dqbuf.part.5+0x260/0x260 [ 68.102861] ? find_held_lock+0x36/0x1c0 [ 68.106945] ? mark_held_locks+0xc7/0x130 [ 68.111118] ? kasan_check_write+0x14/0x20 [ 68.115370] ? __mutex_unlock_slowpath+0x197/0x8c0 [ 68.120325] ? kasan_check_read+0x11/0x20 [ 68.124502] ? wait_for_completion+0x8a0/0x8a0 [ 68.129097] ? trace_hardirqs_off_caller+0x300/0x300 [ 68.134211] ? vfs_lock_file+0xe0/0xe0 [ 68.138123] vb2_core_streamoff+0x60/0x140 [ 68.142377] __vb2_cleanup_fileio+0x73/0x160 [ 68.146802] vb2_core_queue_release+0x1e/0x80 [ 68.151304] _vb2_fop_release+0x1d2/0x2b0 [ 68.155462] vb2_fop_release+0x77/0xc0 [ 68.159370] vivid_fop_release+0x18e/0x440 [ 68.163620] ? vivid_remove+0x460/0x460 [ 68.167603] v4l2_release+0xfb/0x1a0 [ 68.171345] __fput+0x3bc/0xa70 [ 68.174645] ? dev_debug_store+0x140/0x140 [ 68.178888] ? get_max_files+0x20/0x20 [ 68.182790] ? trace_hardirqs_on+0xbd/0x310 [ 68.187124] ? kasan_check_read+0x11/0x20 [ 68.191283] ? task_work_run+0x1af/0x2a0 [ 68.195356] ? trace_hardirqs_off_caller+0x300/0x300 [ 68.200479] ? filp_close+0x1cd/0x250 [ 68.204295] ____fput+0x15/0x20 [ 68.207579] task_work_run+0x1e8/0x2a0 [ 68.211488] ? task_work_cancel+0x240/0x240 [ 68.215825] ? copy_fd_bitmaps+0x210/0x210 [ 68.220070] ? do_syscall_64+0x9a/0x820 [ 68.224055] exit_to_usermode_loop+0x318/0x380 [ 68.228645] ? __bpf_trace_sys_exit+0x30/0x30 [ 68.233155] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 68.238700] do_syscall_64+0x6be/0x820 [ 68.242608] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 68.247983] ? syscall_return_slowpath+0x5e0/0x5e0 [ 68.252922] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 68.257785] ? trace_hardirqs_on_caller+0x310/0x310 [ 68.262811] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 68.267836] ? prepare_exit_to_usermode+0x291/0x3b0 [ 68.272865] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 68.277730] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 68.282928] RIP: 0033:0x400ef0 [ 68.286136] 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 [ 68.305043] RSP: 002b:00007fff00659738 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 68.312755] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000400ef0 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 [ 68.320028] RDX: 0000000020000024 RSI: 0000000020000000 RDI: 0000000000000003 [ 68.327303] RBP: 0000000000000000 R08: 0000000001446880 R09: 00000000004002e0 [ 68.334581] R10: 000000000000000f R11: 0000000000000246 R12: 0000000000401e00 [ 68.341853] R13: 0000000000401e90 R14: 0000000000000000 R15: 0000000000000000 [ 68.349139] ================================================================== [ 68.356498] Disabling lock debugging due to kernel taint [ 68.366850] Kernel panic - not syncing: panic_on_warn set ... 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 [ 68.372773] CPU: 1 PID: 5655 Comm: syz-executor789 Tainted: G B 4.19.0-next-20181030+ #101 [ 68.382487] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.391839] Call Trace: [ 68.394461] dump_stack+0x244/0x39d [ 68.398101] ? dump_stack_print_info.cold.1+0x20/0x20 [ 68.403305] panic+0x2ad/0x55c [ 68.406508] ? add_taint.cold.5+0x16/0x16 [ 68.410665] ? preempt_schedule+0x4d/0x60 [ 68.414818] ? ___preempt_schedule+0x16/0x18 [ 68.419239] ? trace_hardirqs_on+0xb4/0x310 [ 68.423568] kasan_end_report+0x47/0x4f [ 68.427543] kasan_report.cold.8+0x76/0x309 [ 68.432226] ? kthread_stop+0x108/0x8f0 [ 68.436221] check_memory_region+0x13e/0x1b0 [ 68.440634] kasan_check_write+0x14/0x20 [ 68.444704] kthread_stop+0x108/0x8f0 [ 68.448509] ? kthread_unpark+0x160/0x160 [ 68.452666] ? __lock_is_held+0xb5/0x140 [ 68.456745] vivid_stop_generating_vid_cap+0x2bc/0x93b [ 68.462036] ? vivid_start_generating_vid_cap+0x4c0/0x4c0 [ 68.467578] ? _vb2_fop_release+0x3f/0x2b0 [ 68.471835] ? mutex_trylock+0x2b0/0x2b0 [ 68.475904] ? vivid_fop_release+0x66/0x440 [ 68.480248] vid_cap_stop_streaming+0x8d/0xe0 [ 68.484745] ? vid_cap_buf_queue+0x310/0x310 [ 68.489160] __vb2_queue_cancel+0x171/0xca0 [ 68.493502] ? lock_downgrade+0x900/0x900 [ 68.497655] ? __vb2_dqbuf.part.5+0x260/0x260 [ 68.502154] ? find_held_lock+0x36/0x1c0 [ 68.506232] ? mark_held_locks+0xc7/0x130 [ 68.510387] ? kasan_check_write+0x14/0x20 [ 68.514632] ? __mutex_unlock_slowpath+0x197/0x8c0 [ 68.519572] ? kasan_check_read+0x11/0x20 [ 68.523732] ? wait_for_completion+0x8a0/0x8a0 [ 68.528323] ? trace_hardirqs_off_caller+0x300/0x300 [ 68.534299] ? vfs_lock_file+0xe0/0xe0 [ 68.538193] vb2_core_streamoff+0x60/0x140 [ 68.542450] __vb2_cleanup_fileio+0x73/0x160 [ 68.547383] vb2_core_queue_release+0x1e/0x80 [ 68.551885] _vb2_fop_release+0x1d2/0x2b0 [ 68.556039] vb2_fop_release+0x77/0xc0 [ 68.559930] vivid_fop_release+0x18e/0x440 [ 68.564172] ? vivid_remove+0x460/0x460 [ 68.568155] v4l2_release+0xfb/0x1a0 [ 68.571881] __fput+0x3bc/0xa70 [ 68.575169] ? dev_debug_store+0x140/0x140 [ 68.579417] ? get_max_files+0x20/0x20 [ 68.583319] ? trace_hardirqs_on+0xbd/0x310 [ 68.587648] ? kasan_check_read+0x11/0x20 [ 68.591803] ? task_work_run+0x1af/0x2a0 [ 68.595869] ? trace_hardirqs_off_caller+0x300/0x300 [ 68.600974] ? filp_close+0x1cd/0x250 [ 68.604784] ____fput+0x15/0x20 [ 68.608067] task_work_run+0x1e8/0x2a0 [ 68.611964] ? task_work_cancel+0x240/0x240 [ 68.616293] ? copy_fd_bitmaps+0x210/0x210 [ 68.620533] ? do_syscall_64+0x9a/0x820 [ 68.624519] exit_to_usermode_loop+0x318/0x380 [ 68.629109] ? __bpf_trace_sys_exit+0x30/0x30 [ 68.633616] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 68.639169] do_syscall_64+0x6be/0x820 [ 68.643072] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 68.648459] ? syscall_return_slowpath+0x5e0/0x5e0 [ 68.653393] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 68.658251] ? trace_hardirqs_on_caller+0x310/0x310 [ 68.663270] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 68.668293] ? prepare_exit_to_usermode+0x291/0x3b0 [ 68.673320] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 68.678173] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 68.683372] RIP: 0033:0x400ef0 [ 68.686571] 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 [ 68.705477] RSP: 002b:00007fff00659738 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 68.713212] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000400ef0 [ 68.720504] RDX: 0000000020000024 RSI: 0000000020000000 RDI: 0000000000000003 [ 68.727783] RBP: 0000000000000000 R08: 0000000001446880 R09: 00000000004002e0 [ 68.735058] R10: 000000000000000f R11: 0000000000000246 R12: 0000000000401e00 [ 68.742342] R13: 0000000000401e90 R14: 0000000000000000 R15: 0000000000000000 [ 68.750672] Kernel Offset: disabled [ 68.754301] Rebooting in 86400 seconds..