INFO: task kworker/u4:9:6603 blocked for more than 144 seconds.
      Not tainted 6.4.0-rc2-syzkaller-gf1fcbaa18b28 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:9    state:D stack:0     pid:6603  ppid:2      flags:0x00000008
Workqueue: events_unbound io_ring_exit_work
Call trace:
 __switch_to+0x320/0x754 arch/arm64/kernel/process.c:556
 context_switch kernel/sched/core.c:5343 [inline]
 __schedule+0x1368/0x23b8 kernel/sched/core.c:6669
 schedule+0xc4/0x170 kernel/sched/core.c:6745
 schedule_timeout+0xb8/0x348 kernel/time/timer.c:2143
 do_wait_for_common+0x30c/0x468 kernel/sched/completion.c:85
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x48/0x60 kernel/sched/completion.c:138
 io_ring_exit_work+0x600/0x738 io_uring/io_uring.c:3077
 process_one_work+0x788/0x12d4 kernel/workqueue.c:2405
 worker_thread+0x8e0/0xfe8 kernel/workqueue.c:2552
 kthread+0x288/0x310 kernel/kthread.c:379
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/13:
 #0: ffff8000160810d0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xcf4 kernel/rcu/tasks.h:518
1 lock held by rcu_tasks_trace/14:
 #0: ffff800016081490 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xcf4 kernel/rcu/tasks.h:518
1 lock held by khungtaskd/29:
 #0: ffff800016080f00 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:326
1 lock held by udevd/5588:
2 locks held by getty/5732:
 #0: ffff0000db4f0098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff80001ae032f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1210 drivers/tty/n_tty.c:2176
2 locks held by syz-fuzzer/5976:
2 locks held by kworker/u4:7/6108:
2 locks held by kworker/u4:9/6603:
 #0: ffff0000c0029138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x664/0x12d4 kernel/workqueue.c:2378
 #1: ffff800024ee7c20 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x12d4 kernel/workqueue.c:2380
3 locks held by kworker/u4:13/6865:
2 locks held by kworker/1:16/9569:
 #0: ffff0000c0021d38 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x664/0x12d4 kernel/workqueue.c:2378
 #1: ffff80001e4f7c20 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x12d4 kernel/workqueue.c:2380
2 locks held by kworker/u4:15/10893:
 #0: ffff0000c0029138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x664/0x12d4 kernel/workqueue.c:2378
 #1: ffff800021607c20 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x12d4 kernel/workqueue.c:2380
1 lock held by syz-executor.0/13155:
2 locks held by syz-executor.2/13157:
 #0: ffff800018793ea8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:78
 #1: ffff800016086578 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:293 [inline]
 #1: ffff800016086578 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3ac/0x728 kernel/rcu/tree_exp.h:992
1 lock held by syz-executor.4/13160:
 #0: ffff800018793ea8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:78
1 lock held by syz-executor.3/13167:
 #0: ffff0001397f8158 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:110 [inline]
 #0: ffff0001397f8158 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x150/0x3b8 mm/util.c:541
2 locks held by syz-executor.3/13168:
 #0: ffff800018788210 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x3a4/0x644 net/core/net_namespace.c:487
 #1: ffff800018793ea8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:78
1 lock held by syz-executor.3/13175:

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