Warning: Permanently added '10.128.0.98' (ECDSA) to the list of known hosts.
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[   30.269837] refcount_t: underflow; use-after-free.
[   30.275758] ------------[ cut here ]------------
[   30.280524] WARNING: CPU: 1 PID: 8301 at lib/refcount.c:281 refcount_dec_not_one.cold+0x18/0x25
[   30.289442] Kernel panic - not syncing: panic_on_warn set ...
[   30.289442] 
[   30.296892] CPU: 1 PID: 8301 Comm: systemd-udevd Not tainted 4.14.282-syzkaller #0
[   30.304573] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   30.313906] Call Trace:
[   30.316480]  dump_stack+0x1b2/0x281
[   30.320088]  panic+0x1f9/0x42d
[   30.323260]  ? add_taint.cold+0x16/0x16
[   30.327215]  ? refcount_dec_not_one.cold+0x18/0x25
[   30.332122]  ? refcount_dec_not_one.cold+0x18/0x25
[   30.337034]  __warn.cold+0x20/0x44
[   30.340553]  ? ist_end_non_atomic+0x10/0x10
[   30.344865]  ? refcount_dec_not_one.cold+0x18/0x25
[   30.349773]  report_bug+0x208/0x250
[   30.353381]  do_error_trap+0x195/0x2d0
[   30.357247]  ? math_error+0x2d0/0x2d0
[   30.361026]  ? ___preempt_schedule+0x16/0x18
[   30.365439]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   30.370281]  invalid_op+0x1b/0x40
[   30.373719] RIP: 0010:refcount_dec_not_one.cold+0x18/0x25
[   30.379232] RSP: 0018:ffff8880956bfc38 EFLAGS: 00010286
[   30.384574] RAX: 0000000000000026 RBX: 0000000000000000 RCX: 0000000000000000
[   30.391913] RDX: 0000000000000000 RSI: ffffffff878bc600 RDI: ffffed1012ad7f7d
[   30.399160] RBP: ffff8880b18addd8 R08: 0000000000000026 R09: 0000000000000000
[   30.406429] R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffffffff
[   30.413719] R13: 0000000000000000 R14: ffffed10115c493e R15: ffff8880b18adde8
[   30.421009]  ? refcount_dec_not_one.cold+0x18/0x25
[   30.425917]  ? trace_hardirqs_on_caller+0x3a8/0x580
[   30.431175]  refcount_dec_and_mutex_lock+0x1a/0x60
[   30.436090]  nbd_config_put+0x506/0x810
[   30.440046]  nbd_release+0xdf/0x150
[   30.443660]  ? nbd_queue_rq+0xc50/0xc50
[   30.447626]  __blkdev_put+0x5aa/0x800
[   30.451410]  ? revalidate_disk+0x1f0/0x1f0
[   30.455636]  ? locks_remove_file+0x2cd/0x420
[   30.460053]  ? blkdev_put+0x75/0x4c0
[   30.463755]  ? blkdev_put+0x4c0/0x4c0
[   30.467549]  blkdev_close+0x86/0xb0
[   30.471158]  __fput+0x25f/0x7a0
[   30.474420]  task_work_run+0x11f/0x190
[   30.478289]  exit_to_usermode_loop+0x1ad/0x200
[   30.483057]  do_syscall_64+0x4a3/0x640
[   30.486946]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[   30.492113] RIP: 0033:0x7ff081f24270
[   30.495800] RSP: 002b:00007fffb8410ef8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
[   30.503514] RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007ff081f24270
[   30.510787] RDX: 000000000aba9500 RSI: 0000000000000000 RDI: 0000000000000007
[   30.518040] RBP: 00007ff082dde710 R08: 0000556a5f409d30 R09: 0000000000000018
[   30.525295] R10: 0000556a5f4088f8 R11: 0000000000000246 R12: 0000000000000000
[   30.532546] R13: 0000556a5f4056e0 R14: 0000000000000003 R15: 000000000000000e
[   30.540168] Kernel Offset: disabled
[   30.543836] Rebooting in 86400 seconds..