[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
         Starting Load/Save RF Kill Switch Status...
[  OK  ] Started Update UTMP about System Runlevel Changes.
[  OK  ] Started Load/Save RF Kill Switch Status.

Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.1.106' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   29.208872] block nbd0: NBD_DISCONNECT
[   29.212994] kasan: CONFIG_KASAN_INLINE enabled
[   29.217558] kasan: GPF could be caused by NULL-ptr deref or user memory access
[   29.224893] general protection fault: 0000 [#1] PREEMPT SMP KASAN
[   29.231092] Modules linked in:
[   29.234260] CPU: 1 PID: 7951 Comm: syz-executor848 Not tainted 4.14.264-syzkaller #0
[   29.242114] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   29.251454] task: ffff88809a1e2000 task.stack: ffff8880b3a98000
[   29.257486] RIP: 0010:__lock_acquire+0x1cc/0x3f20
[   29.262301] RSP: 0018:ffff8880b3a9f3b0 EFLAGS: 00010006
[   29.267639] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   29.274878] RDX: 0000000000000022 RSI: 0000000000000000 RDI: 0000000000000110
[   29.282127] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
[   29.289372] R10: 0000000000000001 R11: ffff88809a1e2000 R12: 0000000000000110
[   29.296618] R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff8becdd40
[   29.303865] FS:  0000555555a80300(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
[   29.312239] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   29.318094] CR2: 00000000200000c0 CR3: 00000000af458000 CR4: 00000000003406e0
[   29.325344] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   29.332590] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   29.339831] Call Trace:
[   29.342401]  ? vprintk_emit+0x170/0x620
[   29.346360]  ? dev_vprintk_emit+0x1da/0x440
[   29.350652]  ? trace_hardirqs_on+0x10/0x10
[   29.354875]  ? dev_driver_string+0x160/0x160
[   29.359307]  ? trace_hardirqs_on+0x10/0x10
[   29.363546]  lock_acquire+0x170/0x3f0
[   29.367325]  ? flush_workqueue+0xcb/0x1310
[   29.371538]  flush_workqueue+0xfa/0x1310
[   29.375572]  ? flush_workqueue+0xcb/0x1310
[   29.379779]  ? nbd_disconnect_and_put+0x99/0x140
[   29.384508]  ? lock_downgrade+0x740/0x740
[   29.388645]  ? check_flush_dependency+0x2a0/0x2a0
[   29.393466]  nbd_disconnect_and_put+0xc3/0x140
[   29.398045]  nbd_genl_disconnect+0x1fa/0x320
[   29.402432]  genl_family_rcv_msg+0x572/0xb20
[   29.406819]  ? genl_rcv+0x40/0x40
[   29.410246]  ? __ww_mutex_wakeup_for_backoff+0x210/0x210
[   29.415679]  ? trace_hardirqs_on+0x10/0x10
[   29.419902]  ? sock_sendmsg+0xb5/0x100
[   29.423764]  genl_rcv_msg+0xaf/0x140
[   29.427449]  netlink_rcv_skb+0x125/0x390
[   29.431486]  ? genl_family_rcv_msg+0xb20/0xb20
[   29.436040]  ? netlink_ack+0x9a0/0x9a0
[   29.439903]  ? lock_acquire+0x170/0x3f0
[   29.443940]  genl_rcv+0x24/0x40
[   29.447192]  netlink_unicast+0x437/0x610
[   29.451230]  ? netlink_sendskb+0xd0/0xd0
[   29.455265]  ? __check_object_size+0x179/0x230
[   29.459821]  netlink_sendmsg+0x648/0xbc0
[   29.463857]  ? nlmsg_notify+0x1b0/0x1b0
[   29.467803]  ? kernel_recvmsg+0x210/0x210
[   29.472012]  ? security_socket_sendmsg+0x83/0xb0
[   29.476769]  ? nlmsg_notify+0x1b0/0x1b0
[   29.480714]  sock_sendmsg+0xb5/0x100
[   29.484421]  ___sys_sendmsg+0x6c8/0x800
[   29.488366]  ? copy_msghdr_from_user+0x3b0/0x3b0
[   29.493091]  ? netlink_dump+0xad0/0xad0
[   29.497037]  ? nlmsg_notify+0x1b0/0x1b0
[   29.500983]  ? security_socket_recvmsg+0x8b/0xc0
[   29.505713]  ? SyS_recvfrom+0x27f/0x340
[   29.509658]  ? SyS_send+0x40/0x40
[   29.513090]  ? __fdget+0x167/0x1f0
[   29.516691]  ? sockfd_lookup_light+0xb2/0x160
[   29.521170]  __sys_sendmsg+0xa3/0x120
[   29.524943]  ? SyS_shutdown+0x160/0x160
[   29.528900]  ? move_addr_to_kernel+0x60/0x60
[   29.533281]  ? __do_page_fault+0x159/0xad0
[   29.537487]  SyS_sendmsg+0x27/0x40
[   29.541009]  ? __sys_sendmsg+0x120/0x120
[   29.545078]  do_syscall_64+0x1d5/0x640
[   29.548964]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[   29.554129] RIP: 0033:0x7fc369d501b9
[   29.557815] RSP: 002b:00007ffd974225a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   29.565498] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc369d501b9
[   29.572758] RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000004
[   29.580003] RBP: 00007fc369d0f7e0 R08: 0000000000000000 R09: 0000000000000000
[   29.587273] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc369d0f870
[   29.594520] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[   29.601781] Code: 18 00 00 00 00 48 81 c4 80 01 00 00 44 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 67 2a 00 00 49 81 3c 24 a0 97 2f 8b 0f 84 5f 
[   29.620913] RIP: __lock_acquire+0x1cc/0x3f20 RSP: ffff8880b3a9f3b0
[   29.627212] ---[ end trace 96e7238710a3eacc ]---
[   29.631938] Kernel panic - not syncing: Fatal exception
[   29.637437] Kernel Offset: disabled
[   29.641064] Rebooting in 86400 seconds..