[....] 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. [ 27.141260] kauditd_printk_skb: 7 callbacks suppressed [ 27.141271] audit: type=1800 audit(1540932452.940:29): pid=5558 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 [ 27.167668] audit: type=1800 audit(1540932452.940:30): pid=5558 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 syzkaller login: [ 31.286960] sshd (5701) used greatest stack depth: 15744 bytes left Warning: Permanently added '10.128.0.86' (ECDSA) to the list of known hosts. executing program [ 38.148508] kasan: CONFIG_KASAN_INLINE enabled [ 38.153188] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 38.160593] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 38.166833] CPU: 0 PID: 5717 Comm: syz-executor117 Not tainted 4.19.0+ #311 [ 38.173913] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.183267] RIP: 0010:vb2_vmalloc_put_userptr+0x73/0x250 [ 38.188704] 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 [ 38.207592] RSP: 0018:ffff8801d86ef3b8 EFLAGS: 00010202 [ 38.212936] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffffffff113e0ac [ 38.220205] RDX: 0000000000000001 RSI: ffffffff854c11d9 RDI: 0000000000000009 [ 38.227460] RBP: ffff8801d86ef3e8 R08: ffff8801d8956480 R09: ffffed0039760b8b [ 38.234730] R10: ffff8801d86ef4e0 R11: ffff8801cbb05c5f R12: ffffc90002559000 [ 38.241988] R13: 0000000000000000 R14: ffff8801bbc44780 R15: ffff8801bbc44780 [ 38.249246] FS: 0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 38.257463] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.263345] CR2: 000000000043e920 CR3: 000000000946a000 CR4: 00000000001406f0 [ 38.270600] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.277852] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.285109] Call Trace: [ 38.287691] __vb2_queue_free+0x4b1/0xa30 [ 38.291833] ? vb2_vmalloc_detach_dmabuf+0x80/0x80 [ 38.296749] ? __vb2_plane_dmabuf_put.isra.6+0x310/0x310 [ 38.302192] vb2_core_queue_release+0x62/0x80 [ 38.306671] _vb2_fop_release+0x1d2/0x2b0 [ 38.310805] vb2_fop_release+0x77/0xc0 [ 38.314678] vivid_fop_release+0x18e/0x440 [ 38.318916] ? vivid_remove+0x460/0x460 [ 38.322880] ? dev_debug_store+0x140/0x140 [ 38.327111] v4l2_release+0xfb/0x1a0 [ 38.330817] __fput+0x385/0xa30 [ 38.334080] ? get_max_files+0x20/0x20 [ 38.337968] ? trace_hardirqs_on+0xbd/0x310 [ 38.342273] ? kasan_check_read+0x11/0x20 [ 38.346402] ? task_work_run+0x1af/0x2a0 [ 38.350447] ? trace_hardirqs_off_caller+0x310/0x310 [ 38.355538] ____fput+0x15/0x20 [ 38.358802] task_work_run+0x1e8/0x2a0 [ 38.362677] ? task_work_cancel+0x240/0x240 [ 38.366982] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 38.372520] ? switch_task_namespaces+0x9d/0xd0 [ 38.377187] do_exit+0x1ad6/0x26d0 [ 38.380717] ? mm_update_next_owner+0x990/0x990 [ 38.385375] ? kvfree+0x66/0x70 [ 38.388640] ? video_usercopy+0x79b/0x1760 [ 38.392855] ? v4l_s_fmt+0x990/0x990 [ 38.396549] ? v4l_enumstd+0x70/0x70 [ 38.400248] ? rcu_softirq_qs+0x20/0x20 [ 38.404209] ? is_bpf_text_address+0xd3/0x170 [ 38.408688] ? __kernel_text_address+0xd/0x40 [ 38.413165] ? unwind_get_return_address+0x61/0xa0 [ 38.418082] ? __save_stack_trace+0x8d/0xf0 [ 38.422390] ? save_stack+0x43/0xd0 [ 38.426001] ? __kasan_slab_free+0x102/0x150 [ 38.430389] ? kasan_slab_free+0xe/0x10 [ 38.434344] ? kmem_cache_free+0x83/0x290 [ 38.438473] ? do_sys_open+0x54d/0x700 [ 38.442347] ? __x64_sys_open+0x7e/0xc0 [ 38.446303] ? do_syscall_64+0x1b9/0x820 [ 38.450348] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.455696] ? trace_hardirqs_off+0xb8/0x310 [ 38.460087] ? kasan_check_read+0x11/0x20 [ 38.464220] ? do_raw_spin_unlock+0xa7/0x330 [ 38.468617] ? trace_hardirqs_on+0x310/0x310 [ 38.473013] ? video_usercopy+0x1760/0x1760 [ 38.477328] ? video_ioctl2+0x2c/0x33 [ 38.481123] ? v4l2_ioctl+0x15c/0x1b0 [ 38.484910] ? video_devdata+0xa0/0xa0 [ 38.488785] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.494307] ? do_vfs_ioctl+0x201/0x1720 [ 38.498355] ? rcu_lockdep_current_cpu_online+0x1a4/0x210 [ 38.503874] ? ioctl_preallocate+0x300/0x300 [ 38.508269] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.513787] ? __fget_light+0x2e9/0x430 [ 38.517755] ? fget_raw+0x20/0x20 [ 38.521219] ? rcu_read_lock_sched_held+0x14f/0x180 [ 38.526218] ? kmem_cache_free+0x24f/0x290 [ 38.530437] ? putname+0xf7/0x130 [ 38.533874] do_group_exit+0x177/0x440 [ 38.537748] ? trace_hardirqs_on+0xbd/0x310 [ 38.542051] ? __ia32_sys_exit+0x50/0x50 [ 38.546092] ? trace_hardirqs_off_caller+0x310/0x310 [ 38.551179] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.556700] ? ksys_ioctl+0x81/0xd0 [ 38.560316] __x64_sys_exit_group+0x3e/0x50 [ 38.564627] do_syscall_64+0x1b9/0x820 [ 38.568506] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 38.573853] ? syscall_return_slowpath+0x5e0/0x5e0 [ 38.578766] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.583595] ? trace_hardirqs_on_caller+0x310/0x310 [ 38.588600] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 38.593600] ? prepare_exit_to_usermode+0x291/0x3b0 [ 38.598601] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.603429] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.608602] RIP: 0033:0x442da8 [ 38.611784] Code: Bad RIP value. [ 38.615128] RSP: 002b:00007ffc48a36fb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 38.622818] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442da8 [ 38.630068] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 38.637323] RBP: 00000000004c2968 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 38.644585] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 38.651838] R13: 00000000006d4180 R14: 0000000000000000 R15: 0000000000000000 [ 38.659093] Modules linked in: [ 38.662655] ---[ end trace 321c5f63901a0f54 ]--- [ 38.667594] RIP: 0010:vb2_vmalloc_put_userptr+0x73/0x250 [ 38.673037] 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 [ 38.691976] RSP: 0018:ffff8801d86ef3b8 EFLAGS: 00010202 [ 38.697367] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffffffff113e0ac [ 38.704623] RDX: 0000000000000001 RSI: ffffffff854c11d9 RDI: 0000000000000009 [ 38.711918] RBP: ffff8801d86ef3e8 R08: ffff8801d8956480 R09: ffffed0039760b8b [ 38.719223] R10: ffff8801d86ef4e0 R11: ffff8801cbb05c5f R12: ffffc90002559000 [ 38.726509] R13: 0000000000000000 R14: ffff8801bbc44780 R15: ffff8801bbc44780 [ 38.733809] FS: 0000000000f78880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 38.742059] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.747981] CR2: 0000000000442d7e CR3: 000000000946a000 CR4: 00000000001406f0 [ 38.755253] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.762556] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.769842] Kernel panic - not syncing: Fatal exception [ 38.776151] Kernel Offset: disabled [ 38.779772] Rebooting in 86400 seconds..