Warning: Permanently added '10.128.0.98' (ECDSA) to the list of known hosts.
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
syzkaller login: [   36.831405] refcount_t: underflow; use-after-free.
[   36.836706] ------------[ cut here ]------------
[   36.841580] WARNING: CPU: 0 PID: 8419 at lib/refcount.c:281 refcount_dec_not_one.cold+0x18/0x25
[   36.850414] Kernel panic - not syncing: panic_on_warn set ...
[   36.850414] 
[   36.857768] CPU: 0 PID: 8419 Comm: systemd-udevd Not tainted 4.14.296-syzkaller #0
[   36.865464] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
[   36.874890] Call Trace:
[   36.877461]  dump_stack+0x1b2/0x281
[   36.881077]  panic+0x1f9/0x42d
[   36.884253]  ? add_taint.cold+0x16/0x16
[   36.888207]  ? refcount_dec_not_one.cold+0x18/0x25
[   36.893129]  ? refcount_dec_not_one.cold+0x18/0x25
[   36.898042]  __warn.cold+0x20/0x44
[   36.901566]  ? ist_end_non_atomic+0x10/0x10
[   36.905882]  ? refcount_dec_not_one.cold+0x18/0x25
[   36.910791]  report_bug+0x208/0x250
[   36.914400]  do_error_trap+0x195/0x2d0
[   36.918267]  ? math_error+0x2d0/0x2d0
[   36.922053]  ? ___preempt_schedule+0x16/0x18
[   36.926459]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   36.931290]  invalid_op+0x1b/0x40
[   36.934778] RIP: 0010:refcount_dec_not_one.cold+0x18/0x25
[   36.940288] RSP: 0018:ffff8880abfefc38 EFLAGS: 00010286
[   36.945625] RAX: 0000000000000026 RBX: 0000000000000000 RCX: 0000000000000000
[   36.952871] RDX: 0000000000000000 RSI: ffffffff878bc9e0 RDI: ffffed10157fdf7d
[   36.960114] RBP: ffff88809c3993d8 R08: 0000000000000026 R09: 0000000000000000
[   36.967362] R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffffffff
[   36.974610] R13: 0000000000000000 R14: ffffed10113d9ebe R15: ffff88809c3993e8
[   36.981881]  ? refcount_dec_not_one.cold+0x18/0x25
[   36.986792]  ? trace_hardirqs_on_caller+0x3a8/0x580
[   36.991817]  refcount_dec_and_mutex_lock+0x1a/0x60
[   36.996732]  nbd_config_put+0x442/0x6c0
[   37.000694]  nbd_release+0xdf/0x150
[   37.004311]  ? nbd_ioctl+0xad0/0xad0
[   37.008001]  __blkdev_put+0x5aa/0x800
[   37.011798]  ? revalidate_disk+0x1f0/0x1f0
[   37.016018]  ? locks_remove_file+0x2cd/0x420
[   37.020402]  ? blkdev_put+0x75/0x4c0
[   37.024100]  ? blkdev_put+0x4c0/0x4c0
[   37.027891]  blkdev_close+0x86/0xb0
[   37.031502]  __fput+0x25f/0x7a0
[   37.034763]  task_work_run+0x11f/0x190
[   37.038659]  exit_to_usermode_loop+0x1ad/0x200
[   37.043221]  do_syscall_64+0x4a3/0x640
[   37.047090]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[   37.052255] RIP: 0033:0x7f5e02ec4270
[   37.055956] RSP: 002b:00007ffffe5cc2b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
[   37.063641] RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007f5e02ec4270
[   37.070889] RDX: 000000000aba9500 RSI: 0000000000000000 RDI: 0000000000000007
[   37.078139] RBP: 00007f5e03d7e710 R08: 0000000000000045 R09: 0000000000000018
[   37.086338] R10: 000055c590e668f8 R11: 0000000000000246 R12: 0000000000000000
[   37.093793] R13: 000055c590e65a10 R14: 0000000000000003 R15: 000000000000000e
[   37.101462] Kernel Offset: disabled
[   37.105127] Rebooting in 86400 seconds..