[info] Using makefile-style concurrent boot in runlevel 2. [ 27.383723] audit: type=1800 audit(1542268927.449:21): pid=5842 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2419 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 Warning: Permanently added '10.128.10.53' (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 syzkaller login: [ 36.660075] WARNING: CPU: 0 PID: 6093 at drivers/dma-buf/dma-buf.c:992 dma_buf_vunmap+0x1bb/0x220 [ 36.669180] Kernel panic - not syncing: panic_on_warn set ... [ 36.675056] CPU: 0 PID: 6093 Comm: syz-executor327 Not tainted 4.20.0-rc1-next-20181109+ #110 [ 36.683727] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.693059] Call Trace: [ 36.695626] dump_stack+0x244/0x39d [ 36.699235] ? dump_stack_print_info.cold.1+0x20/0x20 [ 36.704609] panic+0x2ad/0x55c [ 36.707800] ? add_taint.cold.5+0x16/0x16 [ 36.711932] ? __warn.cold.8+0x5/0x45 [ 36.715714] ? __warn+0xe8/0x1d0 [ 36.719095] ? dma_buf_vunmap+0x1bb/0x220 [ 36.723224] __warn.cold.8+0x20/0x45 [ 36.726934] ? rcu_softirq_qs+0x20/0x20 [ 36.730887] ? dma_buf_vunmap+0x1bb/0x220 [ 36.735014] report_bug+0x254/0x2d0 [ 36.738637] do_error_trap+0x11b/0x200 [ 36.742536] do_invalid_op+0x36/0x40 [ 36.746247] ? dma_buf_vunmap+0x1bb/0x220 [ 36.750380] invalid_op+0x14/0x20 [ 36.753814] RIP: 0010:dma_buf_vunmap+0x1bb/0x220 [ 36.758552] Code: 00 00 00 00 e8 d6 a2 28 fd 4c 89 f7 e8 0e fc 76 03 e8 c9 a2 28 fd 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 b5 a2 28 fd <0f> 0b eb e3 e8 ac a2 28 fd 0f 0b e8 a5 a2 28 fd 0f 0b e8 9e a2 28 [ 36.777446] RSP: 0018:ffff8801b788f940 EFLAGS: 00010293 [ 36.782894] RAX: ffff8801d270a400 RBX: 0000000000000000 RCX: ffffffff854c3110 [ 36.790149] RDX: 0000000000000000 RSI: ffffffff845705fb RDI: 0000000000000000 [ 36.797399] RBP: ffff8801b788f970 R08: ffff8801d270a400 R09: ffffed00382155be [ 36.804658] R10: ffff8801b788fac8 R11: ffff8801c10aadf7 R12: ffffc90007ed3000 [ 36.812001] R13: ffff8801ce60e4c0 R14: ffff8801ce60e528 R15: ffff8801c21ee480 [ 36.819261] ? __vb2_plane_dmabuf_put.isra.5+0xc0/0x310 [ 36.824606] ? dma_buf_vunmap+0x1bb/0x220 [ 36.828741] vb2_vmalloc_detach_dmabuf+0x5a/0x80 [ 36.833482] ? vb2_vmalloc_map_dmabuf+0x80/0x80 [ 36.838140] __vb2_plane_dmabuf_put.isra.5+0x122/0x310 [ 36.843400] __vb2_queue_free+0x7f3/0xa30 [ 36.847539] ? v4l2_m2m_job_finish+0x4c0/0x4c0 [ 36.852103] ? __vb2_plane_dmabuf_put.isra.5+0x310/0x310 [ 36.857556] ? vidioc_querycap+0xd0/0xd0 [ 36.861615] vb2_core_queue_release+0x62/0x80 [ 36.866095] vb2_queue_release+0x15/0x20 [ 36.870139] v4l2_m2m_ctx_release+0x1e/0x35 [ 36.874445] vim2m_release+0xe6/0x150 [ 36.878237] v4l2_release+0x224/0x3a0 [ 36.882022] __fput+0x3bc/0xa70 [ 36.885285] ? dev_debug_store+0x140/0x140 [ 36.889499] ? get_max_files+0x20/0x20 [ 36.893367] ? trace_hardirqs_on+0xbd/0x310 [ 36.897670] ? kasan_check_read+0x11/0x20 [ 36.901800] ? task_work_run+0x1af/0x2a0 [ 36.905853] ? trace_hardirqs_off_caller+0x300/0x300 [ 36.910953] ? filp_close+0x1cd/0x250 [ 36.914741] ____fput+0x15/0x20 [ 36.918012] task_work_run+0x1e8/0x2a0 [ 36.921884] ? task_work_cancel+0x240/0x240 [ 36.926190] ? copy_fd_bitmaps+0x210/0x210 [ 36.930408] ? do_syscall_64+0x9a/0x820 [ 36.934383] exit_to_usermode_loop+0x318/0x380 [ 36.938948] ? __bpf_trace_sys_exit+0x30/0x30 [ 36.943450] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.948995] do_syscall_64+0x6be/0x820 [ 36.952868] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 36.958216] ? syscall_return_slowpath+0x5e0/0x5e0 [ 36.963128] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.967953] ? trace_hardirqs_on_caller+0x310/0x310 [ 36.972955] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 36.977990] ? prepare_exit_to_usermode+0x291/0x3b0 [ 36.982990] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.987817] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.993002] RIP: 0033:0x405731 [ 36.996200] Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 94 17 00 00 c3 48 83 ec 08 e8 6a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 b3 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 [ 37.015200] RSP: 002b:00007ffdc34a9e30 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 37.022888] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000405731 [ 37.030139] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 0000000000000003 [ 37.037389] RBP: 0000000000008f1f R08: 00000000006dbc3c R09: 000000037ffffa00 [ 37.044652] R10: 00007ffdc34a9e50 R11: 0000000000000293 R12: 000000000000002d [ 37.051911] R13: 20c49ba5e353f7cf R14: 0000000000000004 R15: 00000000006dbd2c [ 37.060259] Kernel Offset: disabled [ 37.063926] Rebooting in 86400 seconds..