INFO: task syz-executor149:3612 blocked for more than 143 seconds.
      Not tainted 5.19.0-syzkaller-02972-g200e340f2196 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor149 state:D stack:27008 pid: 3612 ppid:  3609 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5178 [inline]
 __schedule+0x957/0xe20 kernel/sched/core.c:6490
 schedule+0xcb/0x190 kernel/sched/core.c:6566
 blk_mq_freeze_queue_wait+0x105/0x190 block/blk-mq.c:180
 nbd_add_socket+0x17b/0x8e0 drivers/block/nbd.c:1121
 __nbd_ioctl drivers/block/nbd.c:1462 [inline]
 nbd_ioctl+0x260/0xa40 drivers/block/nbd.c:1519
 blkdev_ioctl+0x3a6/0x760 block/ioctl.c:614
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f5a2bd553d9
RSP: 002b:00007fff7a0c3c08 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000000c195 RCX: 00007f5a2bd553d9
RDX: 0000000000000005 RSI: 000000000000ab00 RDI: 0000000000000004
RBP: 0000000000000000 R08: 00007fff7a0c3da8 R09: 00007fff7a0c3da8
R10: 00007fff7a0c3da8 R11: 0000000000000246 R12: 00007fff7a0c3c1c
R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
 #0: ffffffff8cb1f030 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 kernel/rcu/tasks.h:507
1 lock held by rcu_tasks_trace/13:
 #0: ffffffff8cb1f830 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 kernel/rcu/tasks.h:507
1 lock held by khungtaskd/28:
 #0: ffffffff8cb1ee60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/3285:
 #0: ffff88814a34a098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
 #1: ffffc90002d162e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6e8/0x1e50 drivers/tty/n_tty.c:2124
1 lock held by udevd/3611:
 #0: ffff88801e103118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0x100/0x730 block/bdev.c:910
1 lock held by syz-executor149/3612:
 #0: ffff888146e48198 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x13e/0xa40 drivers/block/nbd.c:1512

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

NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 5.19.0-syzkaller-02972-g200e340f2196 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 nmi_cpu_backtrace+0x473/0x4a0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x168/0x280 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
 watchdog+0xcd5/0xd20 kernel/hung_task.c:369
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3324 Comm: kworker/0:3 Not tainted 5.19.0-syzkaller-02972-g200e340f2196 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Workqueue:  0x0 (mm_percpu_wq)
RIP: 0010:blk_flush_plug include/linux/blkdev.h:1026 [inline]
RIP: 0010:sched_submit_work kernel/sched/core.c:6546 [inline]
RIP: 0010:schedule+0x8b/0x190 kernel/sched/core.c:6563
Code: f9 f9 eb 05 e8 96 46 23 f7 4d 8d b4 24 10 12 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 68 07 a7 f7 49 8b 3e <48> 85 ff 74 0a be 01 00 00 00 e8 76 e9 df f9 4c 89 e3 48 c1 eb 03
RSP: 0018:ffffc90002d2fda8 EFLAGS: 00000246
RAX: 1ffff1100f5fbd52 RBX: ffff8880b9a393c0 RCX: ffff88807afdd880
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000
RBP: ffff888027c7ea68 R08: ffffffff81572bd5 R09: ffffed1017347279
R10: ffffed1017347279 R11: 1ffff11017347278 R12: ffff88807afdd880
R13: ffff8880b9a39410 R14: ffff88807afdea90 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005605aa6e9ee8 CR3: 000000000c88e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 worker_thread+0xfbf/0x1330 kernel/workqueue.c:2457
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30
 </TASK>