INFO: task syz-executor.0:6556 blocked for more than 143 seconds.
      Tainted: G        W          6.10.0-rc2-syzkaller-00003-g8867bbd4a056 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:0     pid:6556  tgid:6555  ppid:6445   flags:0x0000000d
Call trace:
 __switch_to+0x314/0x560 arch/arm64/kernel/process.c:553
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x14b8/0x24e8 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0xbc/0x238 kernel/sched/core.c:6837
 schedule_timeout+0xb8/0x348 kernel/time/timer.c:2557
 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:3972
 nbd_start_device_ioctl drivers/block/nbd.c:1466 [inline]
 __nbd_ioctl drivers/block/nbd.c:1527 [inline]
 nbd_ioctl+0x8cc/0xc38 drivers/block/nbd.c:1567
 blkdev_ioctl+0x3a8/0xa6c block/ioctl.c:676
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl fs/ioctl.c:893 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:893
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598

Showing all locks held in the system:
1 lock held by khungtaskd/31:
 #0: ffff80008f1c76a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:328
2 locks held by kworker/u9:0/53:
 #0: ffff0000caa18148 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: process_one_work+0x62c/0x15e8 kernel/workqueue.c:3205
 #1: ffff800095507c20 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x15e8 kernel/workqueue.c:3205
2 locks held by getty/6014:
 #0: ffff0000cd1e20a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff800097d7b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41c/0x1228 drivers/tty/n_tty.c:2201
1 lock held by syz-executor.0/10696:

=============================================