INFO: task kworker/u4:2:148 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:2    state:D stack:    0 pid:  148 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: ffff0000d9d200e0 (&type->s_umount_key#52){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: ffff0000c18f60b0 (&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: ffff0000dd38a0e0 (
&type->s_umount_key#52){.+.+}-{3:3}
, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: 
ffff0000dd38e0b0
 (
&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: ffff0000d5d540e0 (&type->s_umount_key#52){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: ffff0000e78e00b0 (&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x148/0x1c0 fs/hfsplus/bfind.c:28
4 locks held by kworker/u4:3/354:
 #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: ffff0000d9efe0e0 (&type->s_umount_key#52){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: ffff0000d9efc0b0 (&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x148/0x1c0 fs/hfsplus/bfind.c:28
4 locks held by kworker/u4:4/615:
 #0: ffff0000c1e37938 (
(wq_completion)writeback){+.+.}-{0:0}
, at: process_one_work+0x67c/0x1178 kernel/workqueue.c:-1
 #1: ffff80001fb07c40 (
(work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}
, at: process_one_work+0x6c0/0x1178 kernel/workqueue.c:2285
 #2: 
ffff0000cf9d80e0
 (&type->s_umount_key
#52){.+.+}-{3:3}
, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: 
ffff0000cf9de0b0
 (&tree->tree_lock){+.+.}-{3:3}
, at: hfsplus_find_init+0x148/0x1c0 fs/hfsplus/bfind.c:28
2 locks held by getty/3801:
 #0: ffff0000d4c81098
 (
&tty->ldisc_sem
){++++}-{0:0}
, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340
 #1: ffff80001bf8b2e8 (
&ldata->atomic_read_lock
){+.+.}-{3:3}
, at: n_tty_read+0x2ec/0xf90 drivers/tty/n_tty.c:2158
4 locks held by syz.0.16/4731:
4 locks held by kworker/u4:6/4735:
 #0: 
ffff0000c1e37938
 (
(wq_completion)writeback
){+.+.}-{0:0}
, at: process_one_work+0x67c/0x1178 kernel/workqueue.c:-1
 #1: 
ffff80001ff57c40
 (
(work_completion)(&(&wb->dwork)->work)
){+.+.}-{0:0}, at: process_one_work+0x6c0/0x1178 kernel/workqueue.c:2285
 #2: ffff0000d04180e0 (
&type->s_umount_key#52
){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: 
ffff0000d06220b0
 (
&tree->tree_lock
){+.+.}-{3:3}
, at: hfsplus_find_init+0x148/0x1c0 fs/hfsplus/bfind.c:28
4 locks held by syz.1.17/4757:
4 locks held by syz.2.18/4774:
4 locks held by syz.3.19/4789:
4 locks held by kworker/u4:7/4790:
 #0: 
ffff0000c1e37938
 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x67c/0x1178 kernel/workqueue.c:-1
 #1: 
ffff800020187c40
 (
(work_completion)(&(&wb->dwork)->work)
){+.+.}-{0:0}
, at: process_one_work+0x6c0/0x1178 kernel/workqueue.c:2285
 #2: 
ffff0000d79e80e0
 (
&type->s_umount_key#52){.+.+}-{3:3}
, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: ffff0000d6d440b0 (
&tree->tree_lock
){+.+.}-{3:3}, at: hfsplus_find_init+0x148/0x1c0 fs/hfsplus/bfind.c:28
4 locks held by kworker/u4:8/4815:
 #0: ffff0000c1e37938 (
(wq_completion)writeback
){+.+.}-{0:0}
, at: process_one_work+0x67c/0x1178 kernel/workqueue.c:-1
 #1: 
ffff8000202d7c40
 (
(work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}
, at: process_one_work+0x6c0/0x1178 kernel/workqueue.c:2285
 #2: ffff0000d86940e0 (
&type->s_umount_key#52){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: ffff0000f07da0b0 (&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x148/0x1c0 fs/hfsplus/bfind.c:28
4 locks held by syz.4.20/4817:
4 locks held by syz.5.21/4850:
4 locks held by syz.6.22/4877:
4 locks held by kworker/u4:11/4902:
 #0: ffff0000c1e37938 (
(wq_completion)writeback){+.+.}-{0:0}
, at: process_one_work+0x67c/0x1178 kernel/workqueue.c:-1
 #1: ffff800020587c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6c0/0x1178 kernel/workqueue.c:2285
 #2: ffff0000cbb280e0 (&type->s_umount_key#52){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: ffff0000d6ad60b0 (&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x148/0x1c0 fs/hfsplus/bfind.c:28
5 locks held by syz.7.23/4904:
4 locks held by syz.8.24/4937:

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