[....] 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. [ 27.039087] kauditd_printk_skb: 7 callbacks suppressed [ 27.039099] audit: type=1800 audit(1540963645.138:29): pid=5542 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 [ 27.070763] audit: type=1800 audit(1540963645.138:30): pid=5542 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 '10.128.0.44' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 67.448262] kasan: CONFIG_KASAN_INLINE enabled [ 67.452920] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 67.460402] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 67.466647] CPU: 0 PID: 5699 Comm: syz-executor685 Not tainted 4.19.0+ #312 [ 67.473725] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.483084] RIP: 0010:vb2_vmalloc_put_userptr+0x73/0x250 [ 67.488518] 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 [ 67.507401] RSP: 0018:ffff8801d481f3b8 EFLAGS: 00010202 [ 67.512747] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffffffff113e18c [ 67.520011] RDX: 0000000000000001 RSI: ffffffff854c5ac9 RDI: 0000000000000009 [ 67.527263] RBP: ffff8801d481f3e8 R08: ffff8801d4804140 R09: ffffed00396ceb8b [ 67.534511] R10: ffff8801d481f4e0 R11: ffff8801cb675c5f R12: ffffc90002569000 [ 67.541777] R13: 0000000000000000 R14: ffff8801d76b3700 R15: ffff8801d76b3700 [ 67.549030] FS: 000000000182e880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 67.557236] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 67.563111] CR2: 00005565014e60d0 CR3: 000000000946a000 CR4: 00000000001406f0 [ 67.570367] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 67.577620] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 67.584869] Call Trace: [ 67.587442] __vb2_queue_free+0x4b1/0xa30 [ 67.591577] ? vb2_vmalloc_detach_dmabuf+0x80/0x80 [ 67.596509] ? __vb2_plane_dmabuf_put.isra.6+0x310/0x310 [ 67.601951] vb2_core_queue_release+0x62/0x80 [ 67.606432] _vb2_fop_release+0x1d2/0x2b0 [ 67.610584] vb2_fop_release+0x77/0xc0 [ 67.614455] vivid_fop_release+0x18e/0x440 [ 67.618677] ? vivid_remove+0x460/0x460 [ 67.622635] ? dev_debug_store+0x140/0x140 [ 67.626857] v4l2_release+0xfb/0x1a0 [ 67.630563] __fput+0x385/0xa30 [ 67.633835] ? get_max_files+0x20/0x20 [ 67.637710] ? trace_hardirqs_on+0xbd/0x310 [ 67.642012] ? kasan_check_read+0x11/0x20 [ 67.646155] ? task_work_run+0x1af/0x2a0 [ 67.650209] ? trace_hardirqs_off_caller+0x310/0x310 [ 67.655325] ____fput+0x15/0x20 [ 67.658592] task_work_run+0x1e8/0x2a0 [ 67.662462] ? task_work_cancel+0x240/0x240 [ 67.666766] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 67.672285] ? switch_task_namespaces+0x9d/0xd0 [ 67.676943] do_exit+0x1ad6/0x26d0 [ 67.680485] ? mm_update_next_owner+0x990/0x990 [ 67.685136] ? kvfree+0x66/0x70 [ 67.688406] ? video_usercopy+0x79b/0x1760 [ 67.692628] ? v4l_s_fmt+0x990/0x990 [ 67.696327] ? v4l_enumstd+0x70/0x70 [ 67.700020] ? rcu_softirq_qs+0x20/0x20 [ 67.703979] ? is_bpf_text_address+0xd3/0x170 [ 67.708459] ? __kernel_text_address+0xd/0x40 [ 67.712950] ? unwind_get_return_address+0x61/0xa0 [ 67.717878] ? __save_stack_trace+0x8d/0xf0 [ 67.722186] ? save_stack+0x43/0xd0 [ 67.725795] ? __kasan_slab_free+0x102/0x150 [ 67.730193] ? kasan_slab_free+0xe/0x10 [ 67.734167] ? kmem_cache_free+0x83/0x290 [ 67.738297] ? do_sys_open+0x54d/0x700 [ 67.742251] ? __x64_sys_open+0x7e/0xc0 [ 67.746206] ? do_syscall_64+0x1b9/0x820 [ 67.750252] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 67.755605] ? trace_hardirqs_off+0xb8/0x310 [ 67.759997] ? kasan_check_read+0x11/0x20 [ 67.764124] ? do_raw_spin_unlock+0xa7/0x330 [ 67.768514] ? trace_hardirqs_on+0x310/0x310 [ 67.772906] ? video_usercopy+0x1760/0x1760 [ 67.777211] ? video_ioctl2+0x2c/0x33 [ 67.780994] ? v4l2_ioctl+0x15c/0x1b0 [ 67.784775] ? video_devdata+0xa0/0xa0 [ 67.788647] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 67.794172] ? do_vfs_ioctl+0x201/0x1720 [ 67.798221] ? rcu_lockdep_current_cpu_online+0x1a4/0x210 [ 67.803741] ? ioctl_preallocate+0x300/0x300 [ 67.808134] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 67.813659] ? __fget_light+0x2e9/0x430 [ 67.817618] ? fget_raw+0x20/0x20 [ 67.821055] ? rcu_read_lock_sched_held+0x14f/0x180 [ 67.826062] ? kmem_cache_free+0x24f/0x290 [ 67.830284] ? putname+0xf7/0x130 [ 67.833723] do_group_exit+0x177/0x440 [ 67.837594] ? trace_hardirqs_on+0xbd/0x310 [ 67.841900] ? __ia32_sys_exit+0x50/0x50 [ 67.845960] ? trace_hardirqs_off_caller+0x310/0x310 [ 67.851064] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 67.856586] ? ksys_ioctl+0x81/0xd0 [ 67.860200] __x64_sys_exit_group+0x3e/0x50 [ 67.864508] do_syscall_64+0x1b9/0x820 [ 67.868379] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 67.873729] ? syscall_return_slowpath+0x5e0/0x5e0 [ 67.878655] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 67.883482] ? trace_hardirqs_on_caller+0x310/0x310 [ 67.888481] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 67.893481] ? prepare_exit_to_usermode+0x291/0x3b0 [ 67.898482] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 67.903310] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 67.908496] RIP: 0033:0x442da8 [ 67.911678] Code: Bad RIP value. [ 67.915023] RSP: 002b:00007ffed0b76648 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 67.922762] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442da8 [ 67.930029] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 67.937282] RBP: 00000000004c2968 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 67.944545] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 67.951888] R13: 00000000006d4180 R14: 0000000000000000 R15: 0000000000000000 [ 67.959156] Modules linked in: [ 67.963206] ---[ end trace 55ee2d84dc8f9dc1 ]--- [ 67.968025] RIP: 0010:vb2_vmalloc_put_userptr+0x73/0x250 [ 67.973473] 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 [ 67.992402] RSP: 0018:ffff8801d481f3b8 EFLAGS: 00010202 [ 67.997788] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffffffff113e18c [ 68.005041] RDX: 0000000000000001 RSI: ffffffff854c5ac9 RDI: 0000000000000009 [ 68.012327] RBP: ffff8801d481f3e8 R08: ffff8801d4804140 R09: ffffed00396ceb8b [ 68.019619] R10: ffff8801d481f4e0 R11: ffff8801cb675c5f R12: ffffc90002569000 [ 68.026873] R13: 0000000000000000 R14: ffff8801d76b3700 R15: ffff8801d76b3700 [ 68.034175] FS: 000000000182e880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 68.042438] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 68.048339] CR2: 0000000000442d7e CR3: 000000000946a000 CR4: 00000000001406f0 [ 68.055999] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 68.063297] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 68.070584] Kernel panic - not syncing: Fatal exception [ 68.076832] Kernel Offset: disabled [ 68.080466] Rebooting in 86400 seconds..