INIT: Entering runlevel: 2 [info] Using makefile-style concurrent boot in runlevel 2. [....] 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 '10.128.0.27' (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 syzkaller login: [ 29.465425] ------------[ cut here ]------------ [ 29.470261] kernel BUG at drivers/vhost/vhost.c:1652! [ 29.475613] invalid opcode: 0000 [#1] SMP KASAN [ 29.478011] ------------[ cut here ]------------ [ 29.480259] Dumping ftrace buffer: [ 29.485005] kernel BUG at drivers/vhost/vhost.c:1652! [ 29.488514] (ftrace buffer empty) [ 29.497355] Modules linked in: [ 29.500524] CPU: 1 PID: 4461 Comm: syzkaller684218 Not tainted 4.16.0+ #3 [ 29.507423] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.516760] RIP: 0010:log_write+0x42a/0x4d0 [ 29.521051] RSP: 0018:ffff8801b256f920 EFLAGS: 00010293 [ 29.526389] RAX: ffff8801adc9e2c0 RBX: dffffc0000000000 RCX: ffffffff85924a0f [ 29.533633] RDX: 0000000000000000 RSI: ffffffff85924cea RDI: 0000000000000005 [ 29.540884] RBP: ffff8801b256fa58 R08: ffff8801adc9e2c0 R09: ffffed003962412d [ 29.548300] R10: ffff8801b256fad8 R11: ffff8801cb12096f R12: 0001ffffffffffff [ 29.555543] R13: ffffed00364adf36 R14: 0000000000000000 R15: ffff8801b256fa30 [ 29.562787] FS: 00007fdf24b19700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 [ 29.570988] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.576842] CR2: 0000000020bf6000 CR3: 00000001ae6a7000 CR4: 00000000001406e0 [ 29.584084] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.591326] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.598567] Call Trace: [ 29.601133] ? vhost_umem_alloc+0x1e0/0x1e0 [ 29.605428] ? lock_downgrade+0x8e0/0x8e0 [ 29.609548] ? lock_release+0xa10/0xa10 [ 29.613494] ? check_same_owner+0x320/0x320 [ 29.617788] ? lock_downgrade+0x8e0/0x8e0 [ 29.621908] ? vq_memory_access_ok+0x249/0x2d0 [ 29.626464] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 29.631451] vhost_update_used_flags+0x3af/0x4a0 [ 29.636179] vhost_vq_init_access+0x117/0x590 [ 29.640643] ? vhost_vq_access_ok+0x8b/0x1c0 [ 29.645027] vhost_vsock_dev_ioctl+0x751/0x920 [ 29.649585] ? vhost_vsock_flush+0xb0/0xb0 [ 29.653793] ? expand_files.part.8+0x9a0/0x9a0 [ 29.658350] ? trace_hardirqs_off+0xd/0x10 [ 29.662564] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 29.667645] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 29.672814] ? vhost_vsock_flush+0xb0/0xb0 [ 29.677022] do_vfs_ioctl+0x1cf/0x1650 [ 29.680880] ? rcu_pm_notify+0xc0/0xc0 [ 29.684738] ? trace_hardirqs_off+0xd/0x10 [ 29.688948] ? ioctl_preallocate+0x2e0/0x2e0 [ 29.693329] ? fget_raw+0x20/0x20 [ 29.696756] ? kmem_cache_free+0x25c/0x2d0 [ 29.700964] ? SyS_futex+0x3a4/0x56d [ 29.704648] ? do_futex+0x27d0/0x27d0 [ 29.708423] ? security_file_ioctl+0x9b/0xd0 [ 29.712802] ksys_ioctl+0xa9/0xd0 [ 29.716227] SyS_ioctl+0x24/0x30 [ 29.719565] ? ksys_ioctl+0xd0/0xd0 [ 29.723168] do_syscall_64+0x29e/0x9d0 [ 29.727032] ? vmalloc_sync_all+0x30/0x30 [ 29.731157] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.735625] ? finish_task_switch+0x1ca/0x820 [ 29.740096] ? syscall_return_slowpath+0x5c0/0x5c0 [ 29.745002] ? syscall_return_slowpath+0x30f/0x5c0 [ 29.749902] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 29.755239] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.760053] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 29.765214] RIP: 0033:0x4456c9 [ 29.768373] RSP: 002b:00007fdf24b18da8 EFLAGS: 00000297 ORIG_RAX: 0000000000000010 [ 29.776052] RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 00000000004456c9 [ 29.783303] RDX: 0000000020f82ffc RSI: 000000004004af61 RDI: 000000000000001b [ 29.790544] RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000 [ 29.797786] R10: 0000000000000000 R11: 0000000000000297 R12: 6b636f73762d7473 [ 29.805030] R13: 6f68762f7665642f R14: fffffffffffffffc R15: 0000000000000007 [ 29.812274] Code: e8 7c 5e e4 fb 4c 89 ef e8 e4 16 06 fc 48 8d 85 58 ff ff ff 48 c1 e8 03 c6 04 18 f8 e9 46 ff ff ff 45 31 f6 eb 91 e8 56 5e e4 fb <0f> 0b e8 4f 5e e4 fb 48 c7 c6 a0 a3 24 88 4c 89 ef e8 60 b6 10 [ 29.831402] RIP: log_write+0x42a/0x4d0 RSP: ffff8801b256f920 [ 29.837182] invalid opcode: 0000 [#2] SMP KASAN [ 29.837252] ---[ end trace 0d0ff45aa44d8a23 ]--- [ 29.841850] Dumping ftrace buffer: [ 29.841854] (ftrace buffer empty) [ 29.841861] Modules linked in: [ 29.846599] Kernel panic - not syncing: Fatal exception [ 29.850114] CPU: 0 PID: 4463 Comm: syzkaller684218 Tainted: G D 4.16.0+ #3 [ 29.870485] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.879826] RIP: 0010:log_write+0x42a/0x4d0 [ 29.884115] RSP: 0018:ffff8801af6a7920 EFLAGS: 00010293 [ 29.889450] RAX: ffff8801ae088340 RBX: dffffc0000000000 RCX: ffffffff85924a0f [ 29.896693] RDX: 0000000000000000 RSI: ffffffff85924cea RDI: 0000000000000005 [ 29.903936] RBP: ffff8801af6a7a58 R08: ffff8801ae088340 R09: ffffed0039648145 [ 29.911181] R10: ffff8801af6a7ad8 R11: ffff8801cb240a2f R12: 0001ffffffffffff [ 29.918422] R13: ffffed0035ed4f36 R14: 0000000000000000 R15: ffff8801af6a7a30 [ 29.925666] FS: 00007fdf24af8700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 [ 29.933861] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.939714] CR2: 00007fdf24ad6e78 CR3: 00000001ae6a7000 CR4: 00000000001406f0 [ 29.947305] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.954549] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.961786] Call Trace: [ 29.964352] ? vhost_umem_alloc+0x1e0/0x1e0 [ 29.968646] ? lock_downgrade+0x8e0/0x8e0 [ 29.972764] ? lock_release+0xa10/0xa10 [ 29.976709] ? check_same_owner+0x320/0x320 [ 29.981000] ? lock_acquire+0x1dc/0x520 [ 29.984949] ? __fget+0x3e3/0x650 [ 29.988373] ? lock_downgrade+0x8e0/0x8e0 [ 29.992494] ? vq_memory_access_ok+0x249/0x2d0 [ 29.997052] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 30.002038] vhost_update_used_flags+0x3af/0x4a0 [ 30.006768] vhost_vq_init_access+0x117/0x590 [ 30.011233] ? vhost_vq_access_ok+0x8b/0x1c0 [ 30.015613] vhost_vsock_dev_ioctl+0x751/0x920 [ 30.020169] ? vhost_vsock_flush+0xb0/0xb0 [ 30.024376] ? expand_files.part.8+0x9a0/0x9a0 [ 30.028935] ? trace_hardirqs_off+0xd/0x10 [ 30.033146] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 30.038223] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 30.043388] ? vhost_vsock_flush+0xb0/0xb0 [ 30.047597] do_vfs_ioctl+0x1cf/0x1650 [ 30.051458] ? trace_hardirqs_off+0xd/0x10 [ 30.055673] ? ioctl_preallocate+0x2e0/0x2e0 [ 30.060053] ? fget_raw+0x20/0x20 [ 30.063477] ? trace_hardirqs_on+0xd/0x10 [ 30.067701] ? kmem_cache_free+0x22e/0x2d0 [ 30.071909] ? SyS_futex+0x3a4/0x56d [ 30.075598] ? do_futex+0x27d0/0x27d0 [ 30.079373] ? security_file_ioctl+0x9b/0xd0 [ 30.083754] ksys_ioctl+0xa9/0xd0 [ 30.087179] SyS_ioctl+0x24/0x30 [ 30.090517] ? ksys_ioctl+0xd0/0xd0 [ 30.094116] do_syscall_64+0x29e/0x9d0 [ 30.097976] ? kasan_check_write+0x14/0x20 [ 30.102185] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.107088] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.111992] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 30.117329] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.122144] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 30.127303] RIP: 0033:0x4456c9 [ 30.130464] RSP: 002b:00007fdf24af7da8 EFLAGS: 00000297 ORIG_RAX: 0000000000000010 [ 30.138148] RAX: ffffffffffffffda RBX: 00000000006dac3c RCX: 00000000004456c9 [ 30.145399] RDX: 0000000020f82ffc RSI: 000000004004af61 RDI: 000000000000001e [ 30.152639] RBP: 00000000006dac38 R08: 0000000000000000 R09: 0000000000000000 [ 30.159882] R10: 0000000000000000 R11: 0000000000000297 R12: 6b636f73762d7473 [ 30.167121] R13: 6f68762f7665642f R14: fffffffffffffffc R15: 0000000000000007 [ 30.174362] Code: e8 7c 5e e4 fb 4c 89 ef e8 e4 16 06 fc 48 8d 85 58 ff ff ff 48 c1 e8 03 c6 04 18 f8 e9 46 ff ff ff 45 31 f6 eb 91 e8 56 5e e4 fb <0f> 0b e8 4f 5e e4 fb 48 c7 c6 a0 a3 24 88 4c 89 ef e8 60 b6 10 [ 30.193484] RIP: log_write+0x42a/0x4d0 RSP: ffff8801af6a7920 [ 30.199620] Dumping ftrace buffer: [ 30.203157] (ftrace buffer empty) [ 30.206840] Kernel Offset: disabled [ 30.210441] Rebooting in 86400 seconds..