INFO: task syz-executor.0:6716 blocked for more than 143 seconds.
      Not tainted 6.11.0-rc3-syzkaller-00019-g5c43d43bad35 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:0     pid:6716  tgid:6715  ppid:6598   flags:0x0000000d
Call trace:
 __switch_to+0x314/0x560 arch/arm64/kernel/process.c:553
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x13d4/0x2418 kernel/sched/core.c:6529
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0xbc/0x238 kernel/sched/core.c:6621
 schedule_timeout+0xb8/0x33c 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:3969
 nbd_start_device_ioctl drivers/block/nbd.c:1458 [inline]
 __nbd_ioctl drivers/block/nbd.c:1519 [inline]
 nbd_ioctl+0x8cc/0xc38 drivers/block/nbd.c:1559
 blkdev_ioctl+0x3a8/0xa8c 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: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: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: ffff80008f6edba0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:325
2 locks held by kworker/u9:1/5963:
 #0: ffff0000c9d47148 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: process_one_work+0x624/0x15b8 kernel/workqueue.c:3205
 #1: ffff80009c067c20 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work+0x6a0/0x15b8 kernel/workqueue.c:3205
2 locks held by getty/6154:
 #0: ffff0000cb23f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff80009836e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41c/0x1228 drivers/tty/n_tty.c:2211
5 locks held by syz-executor.0/10892:
 #0: ffff0001b3ce5658 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:560 [inline]
 #0: ffff0001b3ce5658 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1415 [inline]
 #0: ffff0001b3ce5658 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1714 [inline]
 #0: ffff0001b3ce5658 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x2d8/0x2418 kernel/sched/core.c:6436
 #1: ffff0001b3ccff08 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x3c0/0x618 kernel/sched/psi.c:989
 #2: ffff0000cc17d138 (&sig->wait_chldexit){....}-{2:2}, at: __wake_up_common_lock kernel/sched/wait.c:105 [inline]
 #2: ffff0000cc17d138 (&sig->wait_chldexit){....}-{2:2}, at: __wake_up_sync_key+0x34/0x194 kernel/sched/wait.c:173
 #3: ffff0000c71723a8 (&____s->seqcount#4){....}-{0:0}, at: exit_notify kernel/exit.c:776 [inline]
 #3: ffff0000c71723a8 (&____s->seqcount#4){....}-{0:0}, at: do_exit+0x11b8/0x1ad0 kernel/exit.c:902
 #4: ffff8000940f0cd0 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_active_state+0x7c/0x37c lib/debugobjects.c:937

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