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 '10.128.0.28' (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: [ 30.805747] ------------[ cut here ]------------ [ 30.810632] kernel BUG at drivers/vhost/vhost.c:1652! [ 30.816294] invalid opcode: 0000 [#1] SMP KASAN [ 30.818950] ------------[ cut here ]------------ [ 30.820968] Dumping ftrace buffer: [ 30.825727] kernel BUG at drivers/vhost/vhost.c:1652! [ 30.829243] (ftrace buffer empty) [ 30.838107] Modules linked in: [ 30.841301] CPU: 0 PID: 4465 Comm: syzkaller816695 Not tainted 4.16.0+ #1 [ 30.848648] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.858003] RIP: 0010:log_write+0x42a/0x4d0 [ 30.862308] RSP: 0018:ffff8801b0a4f920 EFLAGS: 00010293 [ 30.867661] RAX: ffff8801b1f8e6c0 RBX: dffffc0000000000 RCX: ffffffff8597ac3f [ 30.874935] RDX: 0000000000000000 RSI: ffffffff8597af1a RDI: 0000000000000005 [ 30.882204] RBP: ffff8801b0a4fa58 R08: ffff8801b1f8e6c0 R09: ffffed0039858125 [ 30.889456] R10: ffff8801b0a4fad8 R11: ffff8801cc2c092f R12: 0001ffffffffffff [ 30.896729] R13: ffffed0036149f36 R14: 0000000000000000 R15: ffff8801b0a4fa30 [ 30.903990] FS: 00007f967c404700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 [ 30.912199] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.918080] CR2: 00000000207cb000 CR3: 00000001b0bee000 CR4: 00000000001406f0 [ 30.925343] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.932606] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.939868] Call Trace: [ 30.942447] ? vhost_umem_alloc+0x1e0/0x1e0 [ 30.946771] ? __do_page_fault+0x683/0xe40 [ 30.950991] ? __do_page_fault+0x441/0xe40 [ 30.955210] ? retint_kernel+0x10/0x10 [ 30.959087] ? vhost_update_used_flags+0x2e7/0x4a0 [ 30.964184] ? vhost_update_used_flags+0x2fb/0x4a0 [ 30.969100] vhost_update_used_flags+0x3af/0x4a0 [ 30.973851] vhost_vq_init_access+0x117/0x590 [ 30.978348] ? vhost_vq_access_ok+0x8b/0x1c0 [ 30.982754] vhost_vsock_dev_ioctl+0x751/0x920 [ 30.987340] ? vhost_vsock_flush+0xb0/0xb0 [ 30.991561] ? expand_files.part.8+0x9a0/0x9a0 [ 30.996140] ? trace_hardirqs_off+0xd/0x10 [ 31.000371] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 31.005473] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 31.010652] ? vhost_vsock_flush+0xb0/0xb0 [ 31.014874] do_vfs_ioctl+0x1cf/0x1650 [ 31.018754] ? rcu_pm_notify+0xc0/0xc0 [ 31.022624] ? trace_hardirqs_off+0xd/0x10 [ 31.026843] ? ioctl_preallocate+0x2e0/0x2e0 [ 31.031234] ? fget_raw+0x20/0x20 [ 31.034675] ? kmem_cache_free+0x25c/0x2d0 [ 31.038901] ? SyS_futex+0x3a4/0x56d [ 31.042601] ? do_futex+0x27d0/0x27d0 [ 31.046387] ? security_file_ioctl+0x94/0xc0 [ 31.050785] ksys_ioctl+0xa9/0xd0 [ 31.054248] SyS_ioctl+0x24/0x30 [ 31.057611] ? ksys_ioctl+0xd0/0xd0 [ 31.061224] do_syscall_64+0x29e/0x9d0 [ 31.065095] ? vmalloc_sync_all+0x30/0x30 [ 31.069227] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.073709] ? finish_task_switch+0x1ca/0x810 [ 31.078194] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.083112] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.088045] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 31.094538] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.099371] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 31.104542] RIP: 0033:0x4456c9 [ 31.107716] RSP: 002b:00007f967c403da8 EFLAGS: 00000297 ORIG_RAX: 0000000000000010 [ 31.115411] RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 00000000004456c9 [ 31.122664] RDX: 0000000020f82ffc RSI: 000000004004af61 RDI: 000000000000001a [ 31.129920] RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000 [ 31.137175] R10: 0000000000000000 R11: 0000000000000297 R12: 6b636f73762d7473 [ 31.144440] R13: 6f68762f7665642f R14: fffffffffffffffc R15: 0000000000000007 [ 31.151697] Code: e8 0c 82 df fb 4c 89 ef e8 34 23 01 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 e6 81 df fb <0f> 0b e8 df 81 df fb 48 c7 c6 00 50 25 88 4c 89 ef e8 20 bf 0b [ 31.170892] RIP: log_write+0x42a/0x4d0 RSP: ffff8801b0a4f920 [ 31.176682] invalid opcode: 0000 [#2] SMP KASAN [ 31.176747] ---[ end trace ca383e742f11ff00 ]--- [ 31.181353] Dumping ftrace buffer: [ 31.181359] (ftrace buffer empty) [ 31.181363] Modules linked in: [ 31.181383] CPU: 1 PID: 4468 Comm: syzkaller816695 Tainted: G D 4.16.0+ #1 [ 31.186130] Kernel panic - not syncing: Fatal exception [ 31.189645] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.219464] RIP: 0010:log_write+0x42a/0x4d0 [ 31.223767] RSP: 0018:ffff8801b08b7920 EFLAGS: 00010293 [ 31.229115] RAX: ffff8801b08c2400 RBX: dffffc0000000000 RCX: ffffffff8597ac3f [ 31.236374] RDX: 0000000000000000 RSI: ffffffff8597af1a RDI: 0000000000000005 [ 31.243631] RBP: ffff8801b08b7a58 R08: ffff8801b08c2400 R09: ffffed0035a0413d [ 31.250991] R10: ffff8801b08b7ad8 R11: ffff8801ad0209ef R12: 0001ffffffffffff [ 31.258242] R13: ffffed0036116f36 R14: 0000000000000000 R15: ffff8801b08b7a30 [ 31.265495] FS: 00007f967c3e3700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 [ 31.273721] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.279583] CR2: 00007f967c3c1e78 CR3: 00000001b0bee000 CR4: 00000000001406e0 [ 31.286840] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.294105] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.301442] Call Trace: [ 31.304021] ? vhost_umem_alloc+0x1e0/0x1e0 [ 31.308329] ? lock_downgrade+0x8e0/0x8e0 [ 31.312458] ? lock_release+0xa10/0xa10 [ 31.316416] ? check_same_owner+0x320/0x320 [ 31.320722] ? lock_acquire+0x1dc/0x520 [ 31.324680] ? __fget+0x3e3/0x650 [ 31.328118] ? lock_downgrade+0x8e0/0x8e0 [ 31.332251] ? vq_memory_access_ok+0x249/0x2d0 [ 31.336843] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 31.341851] vhost_update_used_flags+0x3af/0x4a0 [ 31.346596] vhost_vq_init_access+0x117/0x590 [ 31.351076] ? vhost_vq_access_ok+0x8b/0x1c0 [ 31.355475] vhost_vsock_dev_ioctl+0x751/0x920 [ 31.360066] ? vhost_vsock_flush+0xb0/0xb0 [ 31.364287] ? expand_files.part.8+0x9a0/0x9a0 [ 31.368856] ? trace_hardirqs_off+0xd/0x10 [ 31.373078] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 31.378174] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 31.383353] ? vhost_vsock_flush+0xb0/0xb0 [ 31.387584] do_vfs_ioctl+0x1cf/0x1650 [ 31.391459] ? trace_hardirqs_off+0xd/0x10 [ 31.395705] ? ioctl_preallocate+0x2e0/0x2e0 [ 31.400100] ? fget_raw+0x20/0x20 [ 31.403546] ? trace_hardirqs_on+0xd/0x10 [ 31.407681] ? kmem_cache_free+0x22e/0x2d0 [ 31.411906] ? SyS_futex+0x3a4/0x56d [ 31.415607] ? do_futex+0x27d0/0x27d0 [ 31.419400] ? security_file_ioctl+0x94/0xc0 [ 31.423810] ksys_ioctl+0xa9/0xd0 [ 31.427261] SyS_ioctl+0x24/0x30 [ 31.430619] ? ksys_ioctl+0xd0/0xd0 [ 31.434236] do_syscall_64+0x29e/0x9d0 [ 31.438109] ? kasan_check_write+0x14/0x20 [ 31.442329] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.447242] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.452156] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 31.457510] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.462347] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 31.467523] RIP: 0033:0x4456c9 [ 31.470701] RSP: 002b:00007f967c3e2da8 EFLAGS: 00000297 ORIG_RAX: 0000000000000010 [ 31.478393] RAX: ffffffffffffffda RBX: 00000000006dac3c RCX: 00000000004456c9 [ 31.485647] RDX: 0000000020f82ffc RSI: 000000004004af61 RDI: 000000000000001d [ 31.492902] RBP: 00000000006dac38 R08: 0000000000000000 R09: 0000000000000000 [ 31.500176] R10: 0000000000000000 R11: 0000000000000297 R12: 6b636f73762d7473 [ 31.507432] R13: 6f68762f7665642f R14: fffffffffffffffc R15: 0000000000000007 [ 31.514696] Code: e8 0c 82 df fb 4c 89 ef e8 34 23 01 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 e6 81 df fb <0f> 0b e8 df 81 df fb 48 c7 c6 00 50 25 88 4c 89 ef e8 20 bf 0b [ 31.533901] RIP: log_write+0x42a/0x4d0 RSP: ffff8801b08b7920 [ 31.540194] Dumping ftrace buffer: [ 31.543737] (ftrace buffer empty) [ 31.547526] Kernel Offset: disabled [ 31.551129] Rebooting in 86400 seconds..