INFO: task kworker/u8:6:253 blocked for more than 144 seconds.
      Tainted: G        W          6.13.0-rc6-syzkaller-g577490b6abb9 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:6    state:D stack:0     pid:253   tgid:253   ppid:2      flags:0x00000008
Workqueue: writeback wb_workfn (flush-7:0)
Call trace:
 __switch_to+0x414/0x788 arch/arm64/kernel/process.c:701 (T)
 context_switch kernel/sched/core.c:5369 [inline]
 __schedule+0x1744/0x27f0 kernel/sched/core.c:6756
 __schedule_loop kernel/sched/core.c:6833 [inline]
 schedule+0xbc/0x238 kernel/sched/core.c:6848
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6905
 __mutex_lock_common+0xeec/0x28f4 kernel/locking/mutex.c:665
 __mutex_lock kernel/locking/mutex.c:735 [inline]
 mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:787
 exfat_write_inode+0xa4/0x158 fs/exfat/inode.c:108
 write_inode fs/fs-writeback.c:1525 [inline]
 __writeback_single_inode+0x5a0/0x15a4 fs/fs-writeback.c:1745
 writeback_sb_inodes+0x650/0x1088 fs/fs-writeback.c:1976
 __writeback_inodes_wb+0xec/0x234 fs/fs-writeback.c:2047
 wb_writeback+0x3f4/0xe9c fs/fs-writeback.c:2158
 wb_check_background_flush fs/fs-writeback.c:2228 [inline]
 wb_do_writeback fs/fs-writeback.c:2316 [inline]
 wb_workfn+0xc28/0x1048 fs/fs-writeback.c:2343
 process_one_work+0x7a8/0x15cc kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x97c/0xeec kernel/workqueue.c:3391
 kthread+0x288/0x310 kernel/kthread.c:389
 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: ffff80008fb73160 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:336
2 locks held by kworker/u8:4/45:
4 locks held by kworker/u8:6/253:
 #0: ffff0000c20ee948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x60c/0x15cc kernel/workqueue.c:3203
 #1: ffff80009bae7c20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6a4/0x15cc kernel/workqueue.c:3203
 #2: ffff0000f0e500e0 (&type->s_umount_key#91){++++}-{4:4}, at: super_trylock_shared+0x28/0xe4 fs/super.c:562
 #3: ffff0000cdaa00e8 (&sbi->s_lock#2){+.+.}-{4:4}, at: exfat_write_inode+0xa4/0x158 fs/exfat/inode.c:108
2 locks held by getty/6174:
 #0: ffff0000d286a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff80009ba0b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41c/0x1228 drivers/tty/n_tty.c:2211
3 locks held by syz-executor/6430:
2 locks held by kworker/u8:11/7323:
 #0: ffff0000c0031148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x60c/0x15cc kernel/workqueue.c:3203
 #1: ffff80009ddc7c20 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work+0x6a4/0x15cc kernel/workqueue.c:3203
1 lock held by udevd/8963:
 #0: ffff8000900e88e8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_control_ioctl+0x134/0x384 fs/btrfs/super.c:2238
1 lock held by syz.5.392/9178:
 #0: ffff8000900e88e8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_super fs/btrfs/super.c:1841 [inline]
 #0: ffff8000900e88e8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree+0x240/0x12b4 fs/btrfs/super.c:2093
2 locks held by syz.1.393/9180:
1 lock held by syz.7.399/9198:
 #0: ffff8000900e88e8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_super fs/btrfs/super.c:1841 [inline]
 #0: ffff8000900e88e8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree+0x240/0x12b4 fs/btrfs/super.c:2093

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