INFO: task udevd:6673 blocked for more than 140 seconds.
      Not tainted 6.12.0-syzkaller-g7b1d1d4cfac0 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd           state:D stack:0     pid:6673  tgid:6673  ppid:6039   flags:0x0000000c
Call trace:
 __switch_to+0x414/0x788 arch/arm64/kernel/process.c:701 (T)
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x16e0/0x27d0 kernel/sched/core.c:6693
 __schedule_loop kernel/sched/core.c:6770 [inline]
 schedule+0xbc/0x238 kernel/sched/core.c:6785
 schedule_timeout+0xb8/0x33c kernel/time/timer.c:2591
 do_wait_for_common+0x30c/0x468 kernel/sched/completion.c:95
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common kernel/sched/completion.c:127 [inline]
 wait_for_completion+0x48/0x60 kernel/sched/completion.c:148
 __flush_workqueue+0x52c/0x1174 kernel/workqueue.c:3973
 nbd_disconnect_and_put+0x98/0x238 drivers/block/nbd.c:2180
 nbd_release+0xf0/0x130 drivers/block/nbd.c:1670
 bdev_release+0x4a4/0x644
 blkdev_release+0x20/0x34 block/fops.c:639
 __fput+0x1bc/0x75c fs/file_table.c:431
 __fput_sync+0x5c/0x94 fs/file_table.c:516
 __do_sys_close fs/open.c:1567 [inline]
 __se_sys_close fs/open.c:1552 [inline]
 __arm64_sys_close+0x14c/0x1d8 fs/open.c:1552
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600

Showing all locks held in the system:
1 lock held by khungtaskd/31:
 #0: ffff80008faafee0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:336
3 locks held by kworker/u9:0/53: