[....] 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. [ 27.652311] kauditd_printk_skb: 8 callbacks suppressed [ 27.652323] audit: type=1800 audit(1540968700.986:29): pid=5573 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 27.679959] audit: type=1800 audit(1540968700.986:30): pid=5573 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.19' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 57.234409] kasan: CONFIG_KASAN_INLINE enabled [ 57.239152] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 57.246532] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 57.252747] CPU: 0 PID: 5729 Comm: syz-executor144 Not tainted 4.19.0-next-20181031+ #102 [ 57.261068] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.270415] RIP: 0010:vb2_vmalloc_put_userptr+0x73/0x250 [ 57.275855] Code: fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 c2 01 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 5e 08 48 8d 7b 09 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 72 01 00 00 [ 57.294740] RSP: 0018:ffff8801d448f400 EFLAGS: 00010202 [ 57.300099] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffffffff113ecd0 [ 57.307383] RDX: 0000000000000001 RSI: ffffffff854f0c89 RDI: 0000000000000009 [ 57.314649] RBP: ffff8801d448f430 R08: ffff8801ba39e5c0 R09: ffffed003a73585e [ 57.321919] R10: ffff8801d448f528 R11: ffff8801d39ac2f7 R12: ffffc90002561000 [ 57.329171] R13: 0000000000000000 R14: ffff8801d795fe00 R15: ffff8801d795fe00 [ 57.336424] FS: 0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 57.344636] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 57.350501] CR2: 000000000043e910 CR3: 000000000946a000 CR4: 00000000001406f0 [ 57.357766] Call Trace: [ 57.360346] __vb2_queue_free+0x4b1/0xa30 [ 57.364489] ? vb2_vmalloc_detach_dmabuf+0x80/0x80 [ 57.369403] ? __vb2_plane_dmabuf_put.isra.6+0x310/0x310 [ 57.374846] ? vidioc_querycap+0x110/0x110 [ 57.379074] vb2_core_queue_release+0x62/0x80 [ 57.383567] vb2_queue_release+0x15/0x20 [ 57.387627] v4l2_m2m_ctx_release+0x1e/0x35 [ 57.391935] vicodec_release+0xbd/0x120 [ 57.395895] v4l2_release+0xfb/0x1a0 [ 57.399594] __fput+0x3bc/0xa70 [ 57.402866] ? dev_debug_store+0x140/0x140 [ 57.407085] ? get_max_files+0x20/0x20 [ 57.410957] ? trace_hardirqs_on+0xbd/0x310 [ 57.415265] ? kasan_check_read+0x11/0x20 [ 57.419398] ? task_work_run+0x1af/0x2a0 [ 57.423446] ? trace_hardirqs_off_caller+0x300/0x300 [ 57.428537] ____fput+0x15/0x20 [ 57.431805] task_work_run+0x1e8/0x2a0 [ 57.435701] ? task_work_cancel+0x240/0x240 [ 57.440019] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 57.445539] ? switch_task_namespaces+0x9d/0xd0 [ 57.450194] do_exit+0x1ad1/0x26d0 [ 57.453719] ? mm_update_next_owner+0x990/0x990 [ 57.458374] ? kvfree+0x66/0x70 [ 57.461637] ? video_usercopy+0x79b/0x1750 [ 57.465870] ? v4l_s_fmt+0x990/0x990 [ 57.469571] ? v4l_enumstd+0x70/0x70 [ 57.473271] ? rcu_softirq_qs+0x20/0x20 [ 57.477230] ? is_bpf_text_address+0xd3/0x170 [ 57.481722] ? __kernel_text_address+0xd/0x40 [ 57.486203] ? unwind_get_return_address+0x61/0xa0 [ 57.491126] ? __save_stack_trace+0x8d/0xf0 [ 57.495454] ? save_stack+0x43/0xd0 [ 57.499068] ? __kasan_slab_free+0x102/0x150 [ 57.503461] ? kasan_slab_free+0xe/0x10 [ 57.507422] ? kmem_cache_free+0x83/0x290 [ 57.511554] ? do_sys_open+0x54d/0x700 [ 57.515446] ? __x64_sys_open+0x7e/0xc0 [ 57.519405] ? do_syscall_64+0x1b9/0x820 [ 57.523451] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 57.528802] ? trace_hardirqs_off+0xb8/0x310 [ 57.533209] ? kasan_check_read+0x11/0x20 [ 57.537344] ? do_raw_spin_unlock+0xa7/0x330 [ 57.541735] ? trace_hardirqs_on+0x310/0x310 [ 57.546139] ? video_usercopy+0x1750/0x1750 [ 57.550444] ? video_ioctl2+0x2c/0x33 [ 57.554228] ? v4l2_ioctl+0x15c/0x1b0 [ 57.558012] ? video_devdata+0xa0/0xa0 [ 57.561900] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 57.567421] ? do_vfs_ioctl+0x201/0x1790 [ 57.571470] ? rcu_lockdep_current_cpu_online+0x1a4/0x210 [ 57.577010] ? ioctl_preallocate+0x300/0x300 [ 57.581420] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 57.586940] ? __fget_light+0x2e9/0x430 [ 57.590914] ? fget_raw+0x20/0x20 [ 57.594352] ? rcu_read_lock_sched_held+0x14f/0x180 [ 57.599370] ? kmem_cache_free+0x24f/0x290 [ 57.603590] ? putname+0xf7/0x130 [ 57.607031] do_group_exit+0x177/0x440 [ 57.610922] ? trace_hardirqs_on+0xbd/0x310 [ 57.615228] ? __ia32_sys_exit+0x50/0x50 [ 57.619279] ? trace_hardirqs_off_caller+0x300/0x300 [ 57.624396] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 57.629918] ? ksys_ioctl+0x81/0xd0 [ 57.633601] __x64_sys_exit_group+0x3e/0x50 [ 57.637921] do_syscall_64+0x1b9/0x820 [ 57.641811] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 57.647164] ? syscall_return_slowpath+0x5e0/0x5e0 [ 57.652079] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 57.656908] ? trace_hardirqs_on_caller+0x310/0x310 [ 57.661935] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 57.666938] ? prepare_exit_to_usermode+0x291/0x3b0 [ 57.671956] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 57.676795] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 57.681966] RIP: 0033:0x442d98 [ 57.685150] Code: Bad RIP value. [ 57.688497] RSP: 002b:00007ffcc84a8648 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 57.696187] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442d98 [ 57.703440] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 57.710708] RBP: 00000000004c2968 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 57.717971] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 57.725225] R13: 00000000006d4180 R14: 0000000000000000 R15: 0000000000000000 [ 57.732497] Modules linked in: [ 57.736765] ---[ end trace daeafea7fcad30a2 ]--- [ 57.741589] RIP: 0010:vb2_vmalloc_put_userptr+0x73/0x250 [ 57.747032] Code: fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 c2 01 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 5e 08 48 8d 7b 09 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 72 01 00 00 [ 57.765956] RSP: 0018:ffff8801d448f400 EFLAGS: 00010202 [ 57.771338] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffffffff113ecd0 [ 57.778771] RDX: 0000000000000001 RSI: ffffffff854f0c89 RDI: 0000000000000009 [ 57.786051] RBP: ffff8801d448f430 R08: ffff8801ba39e5c0 R09: ffffed003a73585e [ 57.793369] R10: ffff8801d448f528 R11: ffff8801d39ac2f7 R12: ffffc90002561000 [ 57.800674] R13: 0000000000000000 R14: ffff8801d795fe00 R15: ffff8801d795fe00 [ 57.808039] FS: 000000000099d880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 57.816306] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 57.822208] CR2: ffffffffff600400 CR3: 00000001c9e8b000 CR4: 00000000001406f0 [ 57.829514] Kernel panic - not syncing: Fatal exception [ 57.835754] Kernel Offset: disabled [ 57.839377] Rebooting in 86400 seconds..