INFO: task kworker/u8:10:3700 blocked for more than 143 seconds.
      Not tainted 6.10.0-rc4-syzkaller-00301-g5f583a3162ff #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:10   state:D stack:22816 pid:3700  tgid:3700  ppid:2      flags:0x00004000
Workqueue: writeback wb_workfn (flush-7:4)
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0xf15/0x5d00 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6837
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6894
 rwsem_down_write_slowpath kernel/locking/rwsem.c:1178 [inline]
 __down_write_common+0x950/0x13f0 kernel/locking/rwsem.c:1306
 f2fs_down_write fs/f2fs/f2fs.h:2170 [inline]
 f2fs_balance_fs+0x621/0x7b0 fs/f2fs/segment.c:440
 f2fs_write_inode+0x513/0x1060 fs/f2fs/inode.c:799
 write_inode fs/fs-writeback.c:1497 [inline]
 __writeback_single_inode+0xb36/0xf90 fs/fs-writeback.c:1716
 writeback_sb_inodes+0x611/0x1150 fs/fs-writeback.c:1947
 __writeback_inodes_wb+0xff/0x2e0 fs/fs-writeback.c:2018
 wb_writeback+0x721/0xb50 fs/fs-writeback.c:2129
 wb_check_background_flush fs/fs-writeback.c:2199 [inline]
 wb_do_writeback fs/fs-writeback.c:2287 [inline]
 wb_workfn+0x8c4/0xf40 fs/fs-writeback.c:2314
 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231
 process_scheduled_works kernel/workqueue.c:3312 [inline]
 worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff8dbb1920 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 #0: ffffffff8dbb1920 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
 #0: ffffffff8dbb1920 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6614
4 locks held by kworker/u8:10/3700:
 #0: ffff8880196bb148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x12bf/0x1b60 kernel/workqueue.c:3206
 #1: ffffc9000b7a7d80 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x957/0x1b60 kernel/workqueue.c:3207
 #2: ffff88802faa60e0 (&type->s_umount_key#92){++++}-{3:3}, at: super_trylock_shared+0x1e/0xf0 fs/super.c:562
 #3: ffff8880780dd2a0 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2170 [inline]
 #3: ffff8880780dd2a0 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x621/0x7b0 fs/f2fs/segment.c:440
2 locks held by getty/4836:
 #0: ffff88802b10e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc8/0x1490 drivers/tty/n_tty.c:2211
2 locks held by syz-fuzzer/5088:
3 locks held by kworker/0:4/5158:
 #0: ffff888015480948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x12bf/0x1b60 kernel/workqueue.c:3206
 #1: ffffc900039afd80 (free_ipc_work){+.+.}-{0:0}, at: process_one_work+0x957/0x1b60 kernel/workqueue.c:3207
 #2: ffffffff8dbbd0b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:323
3 locks held by kworker/1:3/5159:
6 locks held by syz-executor.4/8907:
1 lock held by syz-executor.2/10312:
4 locks held by syz-executor.0/10318:
 #0: ffff88802b3d0d88 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0x26/0x90 net/bluetooth/hci_core.c:554
 #1: ffff88802b3d0078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x339/0x1100 net/bluetooth/hci_sync.c:5050
 #2: ffffffff8f9aade8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1982 [inline]
 #2: ffffffff8f9aade8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xc4/0x260 net/bluetooth/hci_conn.c:2584
 #3: ffffffff8dbbd0b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:323
3 locks held by syz-executor.3/10321:
 #0: ffff88802cb50d88 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0x26/0x90 net/bluetooth/hci_core.c:554
 #1: ffff88802cb50078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x339/0x1100 net/bluetooth/hci_sync.c:5050
 #2: ffffffff8f9aade8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1982 [inline]
 #2: ffffffff8f9aade8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xc4/0x260 net/bluetooth/hci_conn.c:2584

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