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+0xdfc/0x1bc4 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+0xac8/0x1f14 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+0x144/0x1bc fs/hfsplus/bfind.c:28
 hfsplus_cat_write_inode+0x1cc/0x6f4 fs/hfsplus/inode.c:612
 hfsplus_write_inode+0x154/0x4d0 fs/hfsplus/super.c:173
 write_inode fs/fs-writeback.c:1505 [inline]
 __writeback_single_inode+0x560/0x11c8 fs/fs-writeback.c:1715
 writeback_sb_inodes+0x830/0x13a8 fs/fs-writeback.c:1940
 __writeback_inodes_wb+0x110/0x394 fs/fs-writeback.c:2011
 wb_writeback+0x400/0xe64 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+0xae8/0xe44 fs/fs-writeback.c:2298
 process_one_work+0x79c/0x1138 kernel/workqueue.c:2310
 worker_thread+0x8f4/0x1034 kernel/workqueue.c:2457
 kthread+0x374/0x454 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+0x678/0x1138 kernel/workqueue.c:2283
 #1: ffff80001b407c00
 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}
, at: process_one_work+0x6b8/0x1138 kernel/workqueue.c:2285
 #2: ffff0000d267a0e0 (&type->s_umount_key#52){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: ffff0000d267e0b0 (&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
1 lock held by khungtaskd/27:
 #0: 
ffff800014461360
 (
rcu_read_lock
){....}-{1:2}
, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:312
4 locks held by kworker/u4:2/148:
 #0: ffff0000c1e37938
 ((wq_completion)writeback
){+.+.}-{0:0}, at: process_one_work+0x678/0x1138 kernel/workqueue.c:2283
 #1: ffff80001bf47c00 (
(work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}
, at: process_one_work+0x6b8/0x1138 kernel/workqueue.c:2285
 #2: 
ffff0000c8a840e0 (&type->s_umount_key#52){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: ffff0000c9dac0b0 (
&tree->tree_lock){+.+.}-{3:3}
, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
4 locks held by kworker/u4:3/289:
 #0: ffff0000c1e37938 (
(wq_completion)writeback){+.+.}-{0:0}
, at: process_one_work+0x678/0x1138 kernel/workqueue.c:2283
 #1: 
ffff80001bfb7c00
 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1138 kernel/workqueue.c:2285
 #2: ffff0000d5ba40e0 (
&type->s_umount_key#52
){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: 
ffff0000d69000b0 (&tree->tree_lock
){+.+.}-{3:3}
, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
4 locks held by kworker/u4:4/536:
 #0: ffff0000c1e37938 (
(wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x678/0x1138 kernel/workqueue.c:2283
 #1: ffff80001fc67c00 (
(work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}
, at: process_one_work+0x6b8/0x1138 kernel/workqueue.c:2285
 #2: 
ffff0000ed3e00e0
 (
&type->s_umount_key
#52
){.+.+}-{3:3}
, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: ffff0000ed3e40b0 (
&tree->tree_lock
){+.+.}-{3:3}
, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
2 locks held by getty/3803:
 #0: 
ffff0000d3ded098 (&tty->ldisc_sem
){++++}-{0:0}
, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340
 #1: 
ffff80001b9032e8 (&ldata->atomic_read_lock
){+.+.}-{3:3}, at: n_tty_read+0x2f0/0xf6c drivers/tty/n_tty.c:2158
3 locks held by kworker/1:20/4164:
 #0: ffff0000d3377138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x678/0x1138 kernel/workqueue.c:2283
 #1: ffff80001f7e7c00 (
(work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}
, at: process_one_work+0x6b8/0x1138 kernel/workqueue.c:2285
 #2: ffff8000163bbfe8 (
rtnl_mutex){+.+.}-{3:3}
, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:72
4 locks held by kworker/u4:5/4225:
 #0: ffff0000c1e37938
 ((wq_completion)writeback
){+.+.}-{0:0}, at: process_one_work+0x678/0x1138 kernel/workqueue.c:2283
 #1: ffff80001f667c00 (
(work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}
, at: process_one_work+0x6b8/0x1138 kernel/workqueue.c:2285
 #2: ffff0000d80e80e0
 (&type->s_umount_key#52){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: ffff0000ccfb20b0 (
&tree->tree_lock){+.+.}-{3:3}
, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
4 locks held by syz.0.16/5121:
4 locks held by syz.1.17/5166:
4 locks held by syz.2.18/5185:
4 locks held by kworker/u4:6/5197:
 #0: ffff0000c1e37938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x678/0x1138 kernel/workqueue.c:2283
 #1: ffff80001fce7c00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1138 kernel/workqueue.c:2285
 #2: ffff0000cba420e0 (&type->s_umount_key#52){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: 
ffff0000ceeb20b0 (
&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
4 locks held by syz.3.19/5202:
4 locks held by kworker/u4:7/5203:
 #0: 
ffff0000c1e37938
 (
(wq_completion)writeback
){+.+.}-{0:0}, at: process_one_work+0x678/0x1138 kernel/workqueue.c:2283
 #1: ffff80001fd07c00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1138 kernel/workqueue.c:2285
 #2: 
ffff0000d1e2c0e0
 (
&type->s_umount_key
#52){.+.+}-{3:3}
, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: 
ffff0000ec0900b0
 (&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
4 locks held by syz.4.20/5235:
3 locks held by kworker/u4:8/5249:
 #0: 
ffff0000c0029138
 (
(wq_completion)events_unbound
){+.+.}-{0:0}
, at: process_one_work+0x678/0x1138 kernel/workqueue.c:2283
 #1: ffff800020207c00 (
(linkwatch_work).work){+.+.}-{0:0}
, at: process_one_work+0x6b8/0x1138 kernel/workqueue.c:2285
 #2: ffff8000163bbfe8 (
rtnl_mutex){+.+.}-{3:3}
, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:72
4 locks held by syz.5.21/5261:
4 locks held by kworker/u4:9/5262:
 #0: ffff0000c1e37938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x678/0x1138 kernel/workqueue.c:2283
 #1: ffff80001fda7c00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1138 kernel/workqueue.c:2285
 #2: ffff0000ee04c0e0 (&type->s_umount_key#52){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: 
ffff0000ee0500b0 (&tree->tree_lock
){+.+.}-{3:3}, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
4 locks held by syz.6.22/5289:
4 locks held by kworker/u4:11/5303:
 #0: ffff0000c1e37938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x678/0x1138 kernel/workqueue.c:2283
 #1: ffff800020327c00
 (
(work_completion)(&(&wb->dwork)->work)
){+.+.}-{0:0}
, at: process_one_work+0x6b8/0x1138 kernel/workqueue.c:2285
 #2: ffff0000d85b00e0
 (&type->s_umount_key#52){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: ffff0000d86660b0 (&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
4 locks held by syz.7.23/5316:
4 locks held by syz.8.24/5348:
1 lock held by syz-executor/5351:
 #0: ffff8000163bbfe8 (
rtnl_mutex
){+.+.}-{3:3}
, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
, at: rtnetlink_rcv_msg+0x6d0/0xd70 net/core/rtnetlink.c:5681

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