Warning: Permanently added '10.128.1.0' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   57.115317][ T8470] netlink: 4 bytes leftover after parsing attributes in process `syz-executor090'.
[   57.125079][ T8470] netlink: 4 bytes leftover after parsing attributes in process `syz-executor090'.
[   57.166199][ T8493] 
[   57.168557][ T8493] ============================================
[   57.174879][ T8493] WARNING: possible recursive locking detected
[   57.181037][ T8493] 5.14.0-rc7-syzkaller #0 Not tainted
[   57.186492][ T8493] --------------------------------------------
[   57.192611][ T8493] systemd-udevd/8493 is trying to acquire lock:
[   57.199022][ T8493] ffff88801e2b8d18 (&disk->open_mutex){+.+.}-{3:3}, at: del_gendisk+0x8b/0x770
[   57.208060][ T8493] 
[   57.208060][ T8493] but task is already holding lock:
[   57.215394][ T8493] ffff88801e2b8d18 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xa0/0xae0
[   57.224344][ T8493] 
[   57.224344][ T8493] other info that might help us debug this:
[   57.232373][ T8493]  Possible unsafe locking scenario:
[   57.232373][ T8493] 
[   57.239794][ T8493]        CPU0
[   57.243046][ T8493]        ----
[   57.246301][ T8493]   lock(&disk->open_mutex);
[   57.250932][ T8493]   lock(&disk->open_mutex);
[   57.255495][ T8493] 
[   57.255495][ T8493]  *** DEADLOCK ***
[   57.255495][ T8493] 
[   57.263629][ T8493]  May be due to missing lock nesting notation
[   57.263629][ T8493] 
[   57.272031][ T8493] 2 locks held by systemd-udevd/8493:
[   57.277372][ T8493]  #0: ffff88801e2b8d18 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xa0/0xae0
[   57.286646][ T8493]  #1: ffffffff8c489aa8 (nbd_index_mutex){+.+.}-{3:3}, at: refcount_dec_and_mutex_lock+0x50/0x140
[   57.297229][ T8493] 
[   57.297229][ T8493] stack backtrace:
[   57.303090][ T8493] CPU: 0 PID: 8493 Comm: systemd-udevd Not tainted 5.14.0-rc7-syzkaller #0
[   57.311650][ T8493] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   57.321679][ T8493] Call Trace:
[   57.324935][ T8493]  dump_stack_lvl+0xcd/0x134
[   57.329513][ T8493]  __lock_acquire.cold+0x149/0x3ab
[   57.334626][ T8493]  ? lockdep_hardirqs_on_prepare+0x400/0x400
[   57.340581][ T8493]  ? mark_held_locks+0x9f/0xe0
[   57.345319][ T8493]  lock_acquire+0x1ab/0x510
[   57.349796][ T8493]  ? del_gendisk+0x8b/0x770
[   57.354294][ T8493]  ? lock_release+0x720/0x720
[   57.358943][ T8493]  ? lockdep_hardirqs_on+0x79/0x100
[   57.364121][ T8493]  __mutex_lock+0x12a/0x10a0
[   57.368690][ T8493]  ? del_gendisk+0x8b/0x770
[   57.373171][ T8493]  ? lock_downgrade+0x6e0/0x6e0
[   57.377996][ T8493]  ? del_gendisk+0x8b/0x770
[   57.382480][ T8493]  ? __sanitizer_cov_trace_const_cmp1+0x22/0x80
[   57.388699][ T8493]  ? mutex_lock_io_nested+0xf00/0xf00
[   57.394047][ T8493]  ? kobj_kset_leave+0x12/0x200
[   57.398874][ T8493]  ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70
[   57.405092][ T8493]  ? kobject_put+0xb9/0x540
[   57.409569][ T8493]  ? __sanitizer_cov_trace_cmp8+0x1d/0x70
[   57.415263][ T8493]  ? kfree_const+0x35/0x60
[   57.419654][ T8493]  del_gendisk+0x8b/0x770
[   57.423963][ T8493]  ? nbd_config_put+0x61b/0xa00
[   57.428791][ T8493]  ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70
[   57.435010][ T8493]  ? nbd_genl_disconnect+0x510/0x510
[   57.440278][ T8493]  nbd_put.part.0+0x82/0x160
[   57.444845][ T8493]  nbd_release+0x14d/0x1a0
[   57.449237][ T8493]  blkdev_put+0x34f/0xae0
[   57.453541][ T8493]  ? __sanitizer_cov_trace_const_cmp2+0x22/0x80
[   57.459756][ T8493]  blkdev_close+0x8c/0xb0
[   57.464060][ T8493]  __fput+0x288/0x920
[   57.468017][ T8493]  ? blkdev_put+0xae0/0xae0
[   57.472516][ T8493]  task_work_run+0xdd/0x1a0
[   57.477101][ T8493]  exit_to_user_mode_prepare+0x27e/0x290
[   57.482709][ T8493]  syscall_exit_to_user_mode+0x19/0x60
[   57.488148][ T8493]  do_syscall_64+0x42/0xb0
[   57.492544][ T8493]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[   57.498413][ T8493] RIP: 0033:0x7ff55a15e270
[   57.502823][ T8493] Code: 73 01 c3 48 8b 0d 38 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 59 c1 20 00 00 75 10 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ee fb ff ff 48 89 04 24
[   57.522906][ T8493] RSP: 002b:00007ffc7e31b668 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
[   57.531612][ T8493] RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007ff55a15e270
[   57.539568][ T8493] RDX: 000000000aba9500 RSI: 0000000000000000 RDI: 0000000000000007
[   57.547520][ T8493] RBP: 00007ff55b018710 R08: 000000000000004a R09: 0000000000000008
[   57.555560][ T8493] R10: 0000557c23e83888 R11: 0000000000000246 R12: 0000000000000000
[   57.563520][ T8493] R13: 0000557c23e89680 R14: 0000000000000003 R15: 000000000000000e