INFO: task kworker/u4:0:9 blocked for more than 144 seconds.
      Not tainted 5.15.184-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:0    state:D stack:    0 pid:    9 ppid:     2 flags:0x00000008
Workqueue: writeback wb_workfn (flush-7:4)
Call trace:
 __switch_to+0x2f4/0x558 arch/arm64/kernel/process.c:521
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0xe00/0x1c0c kernel/sched/core.c:6376
 schedule+0x11c/0x1c8 kernel/sched/core.c:6459
 rwsem_down_write_slowpath+0xcb8/0x13f4 kernel/locking/rwsem.c:1165
 __down_write_common kernel/locking/rwsem.c:1292 [inline]
 __down_write kernel/locking/rwsem.c:1301 [inline]
 down_write+0xe8/0x12c kernel/locking/rwsem.c:1552
 f2fs_balance_fs+0x3a4/0x650 fs/f2fs/segment.c:528
 f2fs_write_inode+0x3f4/0x598 fs/f2fs/inode.c:738
 write_inode fs/fs-writeback.c:1495 [inline]
 __writeback_single_inode+0x560/0x11f0 fs/fs-writeback.c:1705
 writeback_sb_inodes+0x7fc/0x1378 fs/fs-writeback.c:1930
 __writeback_inodes_wb+0x110/0x394 fs/fs-writeback.c:2001
 wb_writeback+0x3ec/0xe44 fs/fs-writeback.c:2106
 wb_check_background_flush fs/fs-writeback.c:2172 [inline]
 wb_do_writeback fs/fs-writeback.c:2260 [inline]
 wb_workfn+0xa7c/0xdd8 fs/fs-writeback.c:2288
 process_one_work+0x79c/0x1140 kernel/workqueue.c:2310
 worker_thread+0x8f4/0x101c kernel/workqueue.c:2457
 kthread+0x374/0x454 kernel/kthread.c:334
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870

Showing all locks held in the system:
4 locks held by kworker/u4:0/9:
 #0: ffff0000c2073938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283
 #1: ffff80001b2b7c00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285
 #2: ffff0000d56ae0e0 (&type->s_umount_key#84){++++}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: ffff0000f09611b0 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x3a4/0x650 fs/f2fs/segment.c:528
1 lock held by khungtaskd/27:
 #0: ffff8000143211e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:311
2 locks held by kworker/u4:1/136:
2 locks held by getty/3802:
 #0: ffff0000d4db9098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340
 #1: ffff80001b7902e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x2f0/0xf6c drivers/tty/n_tty.c:2158
2 locks held by udevd/4018:
 #0: ffff0000cc102918 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xdc/0x6ac block/bdev.c:915
 #1: ffff0000cc2f1468 (&lo->lo_mutex){+.+.}-{3:3}, at: __loop_clr_fd+0xa4/0x978 drivers/block/loop.c:1366
6 locks held by syz.4.394/5649:
1 lock held by syz-executor/5849:
 #0: ffff0000cc102918 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x120/0x874 block/bdev.c:820
1 lock held by syz.3.1064/8069:
 #0: ffff0000c12bf418 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline]
 #0: ffff0000c12bf418 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x138/0x284 mm/util.c:549
3 locks held by syz.3.1064/8070:

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