Warning: Permanently added '10.128.0.187' (ECDSA) to the list of known hosts.
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[   66.471897] netlink: 4 bytes leftover after parsing attributes in process `syz-executor568'.
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[   66.535149] netlink: 4 bytes leftover after parsing attributes in process `syz-executor568'.
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[   66.584331] netlink: 4 bytes leftover after parsing attributes in process `syz-executor568'.
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[   66.634672] netlink: 4 bytes leftover after parsing attributes in process `syz-executor568'.
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[   66.684111] netlink: 4 bytes leftover after parsing attributes in process `syz-executor568'.
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[   66.744123] netlink: 4 bytes leftover after parsing attributes in process `syz-executor568'.
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[   66.794148] netlink: 4 bytes leftover after parsing attributes in process `syz-executor568'.
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[   66.853998] netlink: 4 bytes leftover after parsing attributes in process `syz-executor568'.
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[   66.913831] netlink: 4 bytes leftover after parsing attributes in process `syz-executor568'.
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[   66.973940] netlink: 4 bytes leftover after parsing attributes in process `syz-executor568'.
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[   67.589532] refcount_t: underflow; use-after-free.
[   67.594953] ------------[ cut here ]------------
[   67.599710] WARNING: CPU: 1 PID: 8159 at lib/refcount.c:281 refcount_dec_not_one.cold+0x18/0x25
[   67.608618] Kernel panic - not syncing: panic_on_warn set ...
[   67.608618] 
[   67.615982] CPU: 1 PID: 8159 Comm: systemd-udevd Not tainted 4.14.282-syzkaller #0
[   67.623682] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   67.633026] Call Trace:
[   67.635603]  dump_stack+0x1b2/0x281
[   67.639211]  panic+0x1f9/0x42d
[   67.642381]  ? add_taint.cold+0x16/0x16
[   67.646359]  ? refcount_dec_not_one.cold+0x18/0x25
[   67.651292]  ? refcount_dec_not_one.cold+0x18/0x25
[   67.656209]  __warn.cold+0x20/0x44
[   67.659734]  ? ist_end_non_atomic+0x10/0x10
[   67.664053]  ? refcount_dec_not_one.cold+0x18/0x25
[   67.668983]  report_bug+0x208/0x250
[   67.672599]  do_error_trap+0x195/0x2d0
[   67.676473]  ? math_error+0x2d0/0x2d0
[   67.680250]  ? ___preempt_schedule+0x16/0x18
[   67.684639]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   67.689462]  invalid_op+0x1b/0x40
[   67.692895] RIP: 0010:refcount_dec_not_one.cold+0x18/0x25
[   67.698430] RSP: 0018:ffff88809546fc38 EFLAGS: 00010286
[   67.703772] RAX: 0000000000000026 RBX: 0000000000000000 RCX: 0000000000000000
[   67.711019] RDX: 0000000000000000 RSI: ffffffff878bc600 RDI: ffffed1012a8df7d
[   67.718264] RBP: ffff8880b42afb98 R08: 0000000000000026 R09: 0000000000000000
[   67.725520] R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffffffff
[   67.732784] R13: 0000000000000000 R14: ffffed1011a60076 R15: ffff8880b42afba8
[   67.740060]  ? refcount_dec_not_one.cold+0x18/0x25
[   67.744969]  ? trace_hardirqs_on_caller+0x3a8/0x580
[   67.749965]  refcount_dec_and_mutex_lock+0x1a/0x60
[   67.754913]  nbd_config_put+0x506/0x810
[   67.758902]  nbd_release+0xdf/0x150
[   67.762508]  ? nbd_queue_rq+0xc50/0xc50
[   67.766471]  __blkdev_put+0x5aa/0x800
[   67.770253]  ? revalidate_disk+0x1f0/0x1f0
[   67.774465]  ? locks_remove_file+0x2cd/0x420
[   67.778853]  ? blkdev_put+0x75/0x4c0
[   67.782542]  ? blkdev_put+0x4c0/0x4c0
[   67.786319]  blkdev_close+0x86/0xb0
[   67.789946]  __fput+0x25f/0x7a0
[   67.793211]  task_work_run+0x11f/0x190
[   67.797079]  exit_to_usermode_loop+0x1ad/0x200
[   67.801660]  do_syscall_64+0x4a3/0x640
[   67.805537]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[   67.810716] RIP: 0033:0x7fce5da91270
[   67.814404] RSP: 002b:00007ffcf731e6b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
[   67.822088] RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007fce5da91270
[   67.829340] RDX: 000000000aba9500 RSI: 0000000000000000 RDI: 0000000000000007
[   67.836593] RBP: 00007fce5e94b710 R08: 0000000000000045 R09: 0000000000000018
[   67.843840] R10: 000055646d28abd8 R11: 0000000000000246 R12: 0000000000000000
[   67.851085] R13: 000055646d2856e0 R14: 0000000000000003 R15: 000000000000000e
[   67.858685] Kernel Offset: disabled
[   67.862337] Rebooting in 86400 seconds..