Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.10.35' (ECDSA) to the list of known hosts.
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syzkaller login: [   27.737824] netlink: 4 bytes leftover after parsing attributes in process `syz-executor416'.
[   27.747000] netlink: 4 bytes leftover after parsing attributes in process `syz-executor416'.
[   27.756106] netlink: 4 bytes leftover after parsing attributes in process `syz-executor416'.
[   27.764764] netlink: 4 bytes leftover after parsing attributes in process `syz-executor416'.
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[   27.832654] netlink: 4 bytes leftover after parsing attributes in process `syz-executor416'.
[   27.841420] netlink: 4 bytes leftover after parsing attributes in process `syz-executor416'.
[   27.850004] netlink: 4 bytes leftover after parsing attributes in process `syz-executor416'.
[   27.858773] netlink: 4 bytes leftover after parsing attributes in process `syz-executor416'.
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[   27.911657] netlink: 4 bytes leftover after parsing attributes in process `syz-executor416'.
[   27.920410] netlink: 4 bytes leftover after parsing attributes in process `syz-executor416'.
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[   28.778867] refcount_t: underflow; use-after-free.
[   28.785305] ------------[ cut here ]------------
[   28.790061] WARNING: CPU: 0 PID: 8105 at lib/refcount.c:281 refcount_dec_not_one.cold+0x18/0x25
[   28.798872] Kernel panic - not syncing: panic_on_warn set ...
[   28.798872] 
[   28.806214] CPU: 0 PID: 8105 Comm: systemd-udevd Not tainted 4.14.280-syzkaller #0
[   28.813916] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   28.823257] Call Trace:
[   28.825838]  dump_stack+0x1b2/0x281
[   28.829532]  panic+0x1f9/0x42d
[   28.832700]  ? add_taint.cold+0x16/0x16
[   28.836655]  ? refcount_dec_not_one.cold+0x18/0x25
[   28.841562]  ? refcount_dec_not_one.cold+0x18/0x25
[   28.846475]  __warn.cold+0x20/0x44
[   28.849996]  ? ist_end_non_atomic+0x10/0x10
[   28.854295]  ? refcount_dec_not_one.cold+0x18/0x25
[   28.859202]  report_bug+0x208/0x250
[   28.862808]  do_error_trap+0x195/0x2d0
[   28.866671]  ? math_error+0x2d0/0x2d0
[   28.870449]  ? ___preempt_schedule+0x16/0x18
[   28.874844]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   28.879665]  invalid_op+0x1b/0x40
[   28.883094] RIP: 0010:refcount_dec_not_one.cold+0x18/0x25
[   28.888605] RSP: 0018:ffff88809638fc38 EFLAGS: 00010286
[   28.893944] RAX: 0000000000000026 RBX: 0000000000000000 RCX: 0000000000000000
[   28.901189] RDX: 0000000000000000 RSI: ffffffff878bc600 RDI: ffffed1012c71f7d
[   28.908436] RBP: ffff8880a4eb6198 R08: 0000000000000026 R09: 0000000000000000
[   28.915681] R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffffffff
[   28.922925] R13: 0000000000000000 R14: ffffed10119e531e R15: ffff8880a4eb61a8
[   28.930182]  ? refcount_dec_not_one.cold+0x18/0x25
[   28.935090]  ? trace_hardirqs_on_caller+0x3a8/0x580
[   28.940082]  refcount_dec_and_mutex_lock+0x1a/0x60
[   28.944989]  nbd_config_put+0x506/0x810
[   28.948950]  nbd_release+0xdf/0x150
[   28.952559]  ? nbd_queue_rq+0xc50/0xc50
[   28.956505]  __blkdev_put+0x5aa/0x800
[   28.960281]  ? revalidate_disk+0x1f0/0x1f0
[   28.964489]  ? locks_remove_file+0x2cd/0x420
[   28.968874]  ? blkdev_put+0x75/0x4c0
[   28.972563]  ? blkdev_put+0x4c0/0x4c0
[   28.976340]  blkdev_close+0x86/0xb0
[   28.979945]  __fput+0x25f/0x7a0
[   28.983212]  task_work_run+0x11f/0x190
[   28.987080]  exit_to_usermode_loop+0x1ad/0x200
[   28.991636]  do_syscall_64+0x4a3/0x640
[   28.995499]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[   29.000665] RIP: 0033:0x7fa5dd4df270
[   29.004355] RSP: 002b:00007ffe68d9f9e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
[   29.012046] RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007fa5dd4df270
[   29.019304] RDX: 000000000aba9500 RSI: 0000000000000000 RDI: 0000000000000007
[   29.026551] RBP: 00007fa5de399710 R08: 0000561eea004f40 R09: 0000000000000018
[   29.033828] R10: 0000561eea0038f8 R11: 0000000000000246 R12: 0000000000000000
[   29.041078] R13: 0000561eea000860 R14: 0000000000000003 R15: 000000000000000e
[   29.048680] Kernel Offset: disabled
[   29.052337] Rebooting in 86400 seconds..