INFO: task kworker/u4:1:136 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:1    state:D
 stack:    0 pid:  136 ppid:     2 flags:0x00000008
Workqueue: writeback wb_workfn
 (flush-7:0)

Call trace:
 __switch_to+0x2f4/0x540 arch/arm64/kernel/process.c:521
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0xe20/0x1c6c kernel/sched/core.c:6395
 schedule+0x11c/0x1c8 kernel/sched/core.c:6478
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6537
 __mutex_lock_common+0xae0/0x1ea4 kernel/locking/mutex.c:669
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0xac/0x11c kernel/locking/mutex.c:743
 hfsplus_find_init+0x148/0x1c0 fs/hfsplus/bfind.c:28
 hfsplus_cat_write_inode+0x1c8/0x764 fs/hfsplus/inode.c:613
 hfsplus_write_inode+0x14c/0x4c8 fs/hfsplus/super.c:179
 write_inode fs/fs-writeback.c:1505 [inline]
 __writeback_single_inode+0x560/0x11f0 fs/fs-writeback.c:1715
 writeback_sb_inodes+0x868/0x13e4 fs/fs-writeback.c:1940
 __writeback_inodes_wb+0x104/0x370 fs/fs-writeback.c:2011
 wb_writeback+0x408/0xe84 fs/fs-writeback.c:2116
 wb_check_background_flush fs/fs-writeback.c:2182 [inline]
 wb_do_writeback fs/fs-writeback.c:2270 [inline]
 wb_workfn+0xaf8/0xe3c fs/fs-writeback.c:2298
 process_one_work+0x7a4/0x1178 kernel/workqueue.c:2310
 worker_thread+0x8fc/0x103c kernel/workqueue.c:2457
 kthread+0x37c/0x460 kernel/kthread.c:334
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:856

Showing all locks held in the system:
4 locks held by kworker/u4:0/9:
 #0: 
ffff0000c1e37938
 (
(wq_completion)writeback
){+.+.}-{0:0}
, at: process_one_work+0x67c/0x1178 kernel/workqueue.c:-1
 #1: 
ffff80001b507c40
 (
(work_completion)(&(&wb->dwork)->work)
){+.+.}-{0:0}
, at: process_one_work+0x6c0/0x1178 kernel/workqueue.c:2285
 #2: 
ffff0000d75380e0
 (
&type->s_umount_key
#52
){.+.+}-{3:3}
, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: 
ffff0000da2e40b0
 (
&tree->tree_lock
){+.+.}-{3:3}
, at: hfsplus_find_init+0x148/0x1c0 fs/hfsplus/bfind.c:28
1 lock held by khungtaskd/27:
 #0: 
ffff800014571460
 (
rcu_read_lock
){....}-{1:2}
, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:312
4 locks held by kworker/u4:1/136:
 #0: 
ffff0000c1e37938
 (
(wq_completion)writeback
){+.+.}-{0:0}
, at: process_one_work+0x67c/0x1178 kernel/workqueue.c:-1
 #1: 
ffff80001bfa7c40
 (
(work_completion)(&(&wb->dwork)->work)
){+.+.}-{0:0}
, at: process_one_work+0x6c0/0x1178 kernel/workqueue.c:2285
 #2: 
ffff0000d54d20e0
 (
&type->s_umount_key
#52
){.+.+}-{3:3}
, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: 
ffff0000d544a0b0
 (
&tree->tree_lock
){+.+.}-{3:3}
, at: hfsplus_find_init+0x148/0x1c0 fs/hfsplus/bfind.c:28
4 locks held by kworker/u4:2/148:
 #0: 
ffff0000c1e37938
 (
(wq_completion)writeback
){+.+.}-{0:0}
, at: process_one_work+0x67c/0x1178 kernel/workqueue.c:-1
 #1: 
ffff80001cfc7c40
 (
(work_completion)(&(&wb->dwork)->work)
){+.+.}-{0:0}
, at: process_one_work+0x6c0/0x1178 kernel/workqueue.c:2285
 #2: 
ffff0000cfa300e0
 (
&type->s_umount_key
#52
){.+.+}-{3:3}
, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: 
ffff0000ce8140b0
 (
&tree->tree_lock
){+.+.}-{3:3}
, at: hfsplus_find_init+0x148/0x1c0 fs/hfsplus/bfind.c:28
4 locks held by kworker/u4:3/345:
 #0: 
ffff0000c1e37938
 (
(wq_completion)writeback
){+.+.}-{0:0}
, at: process_one_work+0x67c/0x1178 kernel/workqueue.c:-1
 #1: 
ffff80001f747c40
 (
(work_completion)(&(&wb->dwork)->work)
){+.+.}-{0:0}
, at: process_one_work+0x6c0/0x1178 kernel/workqueue.c:2285
 #2: 
ffff0000ef4d00e0
 (
&type->s_umount_key
#52
){.+.+}-{3:3}
, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: 
ffff0000ed4580b0
 (
&tree->tree_lock
){+.+.}-{3:3}
, at: hfsplus_find_init+0x148/0x1c0 fs/hfsplus/bfind.c:28
4 locks held by kworker/u4:5/1620:
 #0: 
ffff0000c1e37938
 (
(wq_completion)writeback
){+.+.}-{0:0}
, at: process_one_work+0x67c/0x1178 kernel/workqueue.c:-1
 #1: 
ffff800023f47c40
 (
(work_completion)(&(&wb->dwork)->work)
){+.+.}-{0:0}
, at: process_one_work+0x6c0/0x1178 kernel/workqueue.c:2285
 #2: 
ffff0000c10300e0
 (
&type->s_umount_key
#52
){.+.+}-{3:3}
, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: 
ffff0000d64de0b0
 (
&tree->tree_lock
){+.+.}-{3:3}
, at: hfsplus_find_init+0x148/0x1c0 fs/hfsplus/bfind.c:28
2 locks held by getty/3801:
 #0: 
ffff0000d33f5098
 (
&tty->ldisc_sem
){++++}-{0:0}
, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340
 #1: 
ffff80001bfab2e8
 (
&ldata->atomic_read_lock
){+.+.}-{3:3}
, at: n_tty_read+0x2ec/0xf90 drivers/tty/n_tty.c:2158
6 locks held by syz.0.16/4717:
6 locks held by syz.1.17/4742:
6 locks held by syz.2.18/4761:
4 locks held by kworker/u4:6/4772:
 #0: 
ffff0000c1e37938
 (
(wq_completion)writeback
){+.+.}-{0:0}
, at: process_one_work+0x67c/0x1178 kernel/workqueue.c:-1
 #1: 
ffff8000203f7c40
 (
(work_completion)(&(&wb->dwork)->work)
){+.+.}-{0:0}
, at: process_one_work+0x6c0/0x1178 kernel/workqueue.c:2285
 #2: 
ffff0000d8c5e0e0
 (
&type->s_umount_key
#52
){.+.+}-{3:3}
, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: 
ffff0000d09ca0b0
 (
&tree->tree_lock
){+.+.}-{3:3}
, at: hfsplus_find_init+0x148/0x1c0 fs/hfsplus/bfind.c:28
4 locks held by kworker/u4:7/4774:
 #0: 
ffff0000c1e37938
 (
(wq_completion)writeback
){+.+.}-{0:0}
, at: process_one_work+0x67c/0x1178 kernel/workqueue.c:-1
 #1: 
ffff800020417c40
 (
(work_completion)(&(&wb->dwork)->work)
){+.+.}-{0:0}
, at: process_one_work+0x6c0/0x1178 kernel/workqueue.c:2285
 #2: 
ffff0000d59860e0
 (
&type->s_umount_key
#52
){.+.+}-{3:3}
, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: 
ffff0000e723a0b0
 (
&tree->tree_lock
){+.+.}-{3:3}
, at: hfsplus_find_init+0x148/0x1c0 fs/hfsplus/bfind.c:28
9 locks held by syz.3.19/4779:
6 locks held by syz.4.20/4809:
4 locks held by kworker/u4:8/4817:
 #0: 
ffff0000c1e37938
 (
(wq_completion)writeback
){+.+.}-{0:0}
, at: process_one_work+0x67c/0x1178 kernel/workqueue.c:-1
 #1: 
ffff8000204f7c40
 (
(work_completion)(&(&wb->dwork)->work)
){+.+.}-{0:0}
, at: process_one_work+0x6c0/0x1178 kernel/workqueue.c:2285
 #2: 
ffff0000d054e0e0
 (
&type->s_umount_key
#52
){.+.+}-{3:3}
, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: 
ffff0000ed4de0b0
 (
&tree->tree_lock
){+.+.}-{3:3}
, at: hfsplus_find_init+0x148/0x1c0 fs/hfsplus/bfind.c:28
6 locks held by syz.5.21/4838:
6 locks held by syz.6.22/4865:
6 locks held by syz.7.23/4891:
4 locks held by kworker/u4:12/4909:
 #0: 
ffff0000c1e37938
 (
(wq_completion)writeback
){+.+.}-{0:0}
, at: process_one_work+0x67c/0x1178 kernel/workqueue.c:-1
 #1: 
ffff8000206d7c40
 (
(work_completion)(&(&wb->dwork)->work)
){+.+.}-{0:0}
, at: process_one_work+0x6c0/0x1178 kernel/workqueue.c:2285
 #2: 
ffff0000d83560e0
 (
&type->s_umount_key
#52
){.+.+}-{3:3}
, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: 
ffff0000d9b2a0b0
 (
&tree->tree_lock
){+.+.}-{3:3}
, at: hfsplus_find_init+0x148/0x1c0 fs/hfsplus/bfind.c:28
9 locks held by syz.8.24/4925:

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