INFO: task kworker/0:4:6488 blocked for more than 143 seconds.
      Not tainted 6.14.0-rc3-syzkaller-ga1c24ab82279 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:4     state:D stack:0     pid:6488  tgid:6488  ppid:2      task_flags:0x4208060 flags:0x00000008
Workqueue: events p9_write_work
Call trace:
 __switch_to+0x414/0x788 arch/arm64/kernel/process.c:701 (T)
 context_switch kernel/sched/core.c:5378 [inline]
 __schedule+0x1360/0x257c kernel/sched/core.c:6765
 __schedule_loop kernel/sched/core.c:6842 [inline]
 schedule+0xbc/0x238 kernel/sched/core.c:6857
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6914
 __mutex_lock_common+0xd30/0x24b8 kernel/locking/mutex.c:662
 __mutex_lock kernel/locking/mutex.c:730 [inline]
 mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:782
 pipe_write+0x184/0x1880 fs/pipe.c:456
 __kernel_write_iter+0x340/0x7a0 fs/read_write.c:612
 __kernel_write fs/read_write.c:632 [inline]
 kernel_write+0x1cc/0x2d0 fs/read_write.c:653
 p9_fd_write net/9p/trans_fd.c:432 [inline]
 p9_write_work+0x45c/0xc1c net/9p/trans_fd.c:483
 process_one_work+0x810/0x1638 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3317 [inline]
 worker_thread+0x97c/0xeec kernel/workqueue.c:3398
 kthread+0x65c/0x7b0 kernel/kthread.c:464
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862

Showing all locks held in the system:
1 lock held by khungtaskd/31:
 #0: ffff80008fda2220 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:336
3 locks held by kworker/u8:2/42:
2 locks held by kworker/u8:6/2105:
 #0: ffff0000c0031148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x674/0x1638 kernel/workqueue.c:3210
 #1: ffff8000a1777ba0 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x708/0x1638 kernel/workqueue.c:3210
2 locks held by getty/6197:
 #0: ffff0000ccb530a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff80009bcae2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41c/0x1228 drivers/tty/n_tty.c:2211
3 locks held by kworker/0:4/6488:
 #0: ffff0000c0028d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x674/0x1638 kernel/workqueue.c:3210
 #1: ffff8000a3d67ba0 ((work_completion)(&m->wq)){+.+.}-{0:0}, at: process_one_work+0x708/0x1638 kernel/workqueue.c:3210
 #2: ffff0000ef276868 (&pipe->mutex){+.+.}-{4:4}, at: pipe_write+0x184/0x1880 fs/pipe.c:456
2 locks held by syz.3.590/8388:
 #0: ffff0000ef276868 (&pipe->mutex){+.+.}-{4:4}, at: pipe_write+0x184/0x1880 fs/pipe.c:456
 #1: ffff0000ee9b02e8 (mapping.invalidate_lock#4){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:932 [inline]
 #1: ffff0000ee9b02e8 (mapping.invalidate_lock#4){.+.+}-{4:4}, at: filemap_fault+0xa80/0x1518 mm/filemap.c:3454
2 locks held by kworker/u8:13/13085:
 #0: ffff0000c0031148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x674/0x1638 kernel/workqueue.c:3210
 #1: ffff80009edb7ba0 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x708/0x1638 kernel/workqueue.c:3210
3 locks held by syz.5.2453/13351:

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