Warning: Permanently added '10.128.0.60' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   34.918431] block nbd0: NBD_DISCONNECT
[   34.922555] kasan: CONFIG_KASAN_INLINE enabled
[   34.927117] kasan: GPF could be caused by NULL-ptr deref or user memory access
[   34.934466] general protection fault: 0000 [#1] PREEMPT SMP KASAN
[   34.940677] Modules linked in:
[   34.943851] CPU: 1 PID: 7958 Comm: syz-executor241 Not tainted 4.14.218-syzkaller #0
[   34.951719] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   34.961060] task: ffff88809a896200 task.stack: ffff888094fc0000
[   34.967115] RIP: 0010:__lock_acquire+0x1cc/0x3f20
[   34.971957] RSP: 0018:ffff888094fc73b0 EFLAGS: 00010006
[   34.977301] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   34.984555] RDX: 0000000000000022 RSI: 0000000000000000 RDI: 0000000000000110
[   34.991808] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
[   34.999083] R10: 0000000000000001 R11: ffff88809a896200 R12: 0000000000000110
[   35.006342] R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff8beb4d40
[   35.013599] FS:  00000000015ab300(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
[   35.021807] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   35.027690] CR2: 0000000020000080 CR3: 0000000099bc0000 CR4: 00000000001406e0
[   35.034951] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   35.042209] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   35.049463] Call Trace:
[   35.052051]  ? vprintk_emit+0x170/0x620
[   35.056008]  ? dev_vprintk_emit+0x1da/0x440
[   35.060325]  ? trace_hardirqs_on+0x10/0x10
[   35.064540]  ? dev_driver_string+0x160/0x160
[   35.068949]  ? trace_hardirqs_on+0x10/0x10
[   35.073177]  lock_acquire+0x170/0x3f0
[   35.076989]  ? flush_workqueue+0xcb/0x1310
[   35.081205]  flush_workqueue+0xfa/0x1310
[   35.085254]  ? flush_workqueue+0xcb/0x1310
[   35.089473]  ? nbd_disconnect_and_put+0x99/0x140
[   35.094242]  ? lock_downgrade+0x740/0x740
[   35.098369]  ? check_flush_dependency+0x2a0/0x2a0
[   35.103204]  nbd_disconnect_and_put+0xc3/0x140
[   35.107768]  nbd_genl_disconnect+0x1fa/0x320
[   35.112161]  genl_family_rcv_msg+0x572/0xb20
[   35.116551]  ? genl_rcv+0x40/0x40
[   35.120009]  ? __ww_mutex_wakeup_for_backoff+0x210/0x210
[   35.125443]  ? trace_hardirqs_on+0x10/0x10
[   35.129660]  ? sock_sendmsg+0xb5/0x100
[   35.133530]  genl_rcv_msg+0xaf/0x140
[   35.137235]  netlink_rcv_skb+0x125/0x390
[   35.141281]  ? genl_family_rcv_msg+0xb20/0xb20
[   35.145843]  ? netlink_ack+0x9a0/0x9a0
[   35.149725]  ? lock_acquire+0x170/0x3f0
[   35.153679]  genl_rcv+0x24/0x40
[   35.156941]  netlink_unicast+0x437/0x610
[   35.161003]  ? netlink_sendskb+0xd0/0xd0
[   35.165048]  ? __check_object_size+0x179/0x230
[   35.169631]  netlink_sendmsg+0x62e/0xb80
[   35.173671]  ? nlmsg_notify+0x170/0x170
[   35.177625]  ? kernel_recvmsg+0x210/0x210
[   35.181797]  ? security_socket_sendmsg+0x83/0xb0
[   35.186541]  ? nlmsg_notify+0x170/0x170
[   35.190496]  sock_sendmsg+0xb5/0x100
[   35.194191]  ___sys_sendmsg+0x6c8/0x800
[   35.198148]  ? copy_msghdr_from_user+0x3b0/0x3b0
[   35.202897]  ? __lock_acquire+0x5fc/0x3f20
[   35.207128]  ? __dentry_kill+0x3f7/0x550
[   35.211170]  ? trace_hardirqs_on+0x10/0x10
[   35.215410]  ? rcu_lockdep_current_cpu_online+0xed/0x140
[   35.220889]  ? dentry_free+0xc6/0x120
[   35.224674]  ? rcu_read_lock_sched_held+0x16c/0x1d0
[   35.229675]  ? kmem_cache_free+0x23a/0x2b0
[   35.233891]  ? mntput_no_expire+0xc7/0x910
[   35.238103]  ? lock_acquire+0x170/0x3f0
[   35.242050]  ? __fdget+0x167/0x1f0
[   35.245566]  ? sockfd_lookup_light+0xb2/0x160
[   35.250042]  __sys_sendmsg+0xa3/0x120
[   35.253822]  ? SyS_shutdown+0x160/0x160
[   35.258548]  SyS_sendmsg+0x27/0x40
[   35.262064]  ? __sys_sendmsg+0x120/0x120
[   35.266112]  do_syscall_64+0x1d5/0x640
[   35.269987]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[   35.275159] RIP: 0033:0x444099
[   35.278334] RSP: 002b:00007ffd2ac49d68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   35.286731] RAX: ffffffffffffffda RBX: 00000000004004b8 RCX: 0000000000444099
[   35.294048] RDX: 0000000000004800 RSI: 0000000020000240 RDI: 0000000000000004
[   35.301318] RBP: 00000000004036c0 R08: 0000000000000001 R09: 00000000004004b8
[   35.308590] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000403750
[   35.315862] R13: 0000000000000000 R14: 00000000004b1018 R15: 00000000004004b8
[   35.323119] 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 07 2e 8b 0f 84 5f 
[   35.342188] RIP: __lock_acquire+0x1cc/0x3f20 RSP: ffff888094fc73b0
[   35.348602] ---[ end trace 98020a71bf72c082 ]---
[   35.353335] Kernel panic - not syncing: Fatal exception
[   35.359173] Kernel Offset: disabled
[   35.362793] Rebooting in 86400 seconds..