INFO: task kworker/u4:0:9 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:0    state:D
 stack:    0 pid:    9 ppid:     2 flags:0x00000008
Workqueue: writeback wb_workfn
 (flush-7:0)

Call trace:
 __switch_to+0x2f4/0x558 arch/arm64/kernel/process.c:521
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0xe08/0x1bf8 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+0xa9c/0x1edc 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+0x1a0/0x6b8 fs/hfsplus/inode.c:588
 hfsplus_write_inode+0x154/0x4d4 fs/hfsplus/super.c:160
 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:856

Showing all locks held in the system:
4 locks held by kworker/u4:0/9:
 #0: ffff0000c21e0138
 ((wq_completion)writeback){+.+.}-{0:0}
, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283
 #1: ffff80001b2f7c00 (
(work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285
 #2: ffff0000d95a60e0 (
&type->s_umount_key#52){.+.+}-{3:3}
, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: ffff0000ecab00b0 (&tree->tree_lock){+.+.}-{3:3}
, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
1 lock held by khungtaskd/27:
 #0: 
ffff8000143513a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:311
4 locks held by kworker/u4:1/136:
 #0: ffff0000c21e0138 (
(wq_completion)writeback
){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283
 #1: ffff80001b987c00
 ((work_completion)(&(&wb->dwork)->work)
){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285
 #2: ffff0000ec5c20e0 (&type->s_umount_key#52){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: ffff0000ec5c60b0
 (&tree->tree_lock){+.+.}-{3:3}
, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
4 locks held by kworker/u4:2/148:
 #0: ffff0000c21e0138 (
(wq_completion)writeback){+.+.}-{0:0}
, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283
 #1: ffff80001be47c00 (
(work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285
 #2: ffff0000cd3b20e0
 (&type->s_umount_key
#52){.+.+}-{3:3}
, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: 
ffff0000cd3fa0b0
 (&tree->tree_lock){+.+.}-{3:3}
, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
4 locks held by kworker/u4:3/349:
 #0: ffff0000c21e0138 ((wq_completion)writeback){+.+.}-{0:0}
, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283
 #1: 
ffff80001f517c00 (
(work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}
, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285
 #2: 
ffff0000d1a080e0
 (
&type->s_umount_key
#52){.+.+}-{3:3}
, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: 
ffff0000d7d180b0
 (&tree->tree_lock
){+.+.}-{3:3}, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
2 locks held by getty/3801:
 #0: ffff0000d353b098 (
&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340
 #1: ffff80001bd0b2e8 (
&ldata->atomic_read_lock){+.+.}-{3:3}
, at: n_tty_read+0x2f0/0xf6c drivers/tty/n_tty.c:2158
4 locks held by kworker/u4:5/4123:
 #0: ffff0000c21e0138 (
(wq_completion)writeback){+.+.}-{0:0}
, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283
 #1: ffff80001f977c00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285
 #2: ffff0000d96580e0 (
&type->s_umount_key#52){.+.+}-{3:3}
, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: ffff0000d4dcc0b0 (&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
3 locks held by kworker/0:12/4182:
 #0: ffff0000d20e1d38 (
(wq_completion)ipv6_addrconf
){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283
 #1: 
ffff800020557c00 ((work_completion)(&(&ifa->dad_work)->work)
){+.+.}-{0:0}
, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285
 #2: ffff8000162aea68 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:72
6 locks held by syz.0.16/4956:
8 locks held by syz.1.17/4979:
6 locks held by syz.2.18/5004:
6 locks held by syz.3.19/5026:
4 locks held by kworker/u4:8/5054:
 #0: ffff0000c21e0138 (
(wq_completion)writeback){+.+.}-{0:0}
, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283
 #1: 
ffff800020147c00
 (
(work_completion)(&(&wb->dwork)->work)
){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285
 #2: ffff0000e94040e0 (
&type->s_umount_key#52){.+.+}-{3:3}
, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: ffff0000d06e80b0 (
&tree->tree_lock){+.+.}-{3:3}
, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
6 locks held by syz.4.20/5066:
4 locks held by kworker/u4:9/5096:
 #0: 
ffff0000c21e0138
 (
(wq_completion)writeback){+.+.}-{0:0}
, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283
 #1: ffff800020247c00
 (
(work_completion)(&(&wb->dwork)->work)
){+.+.}-{0:0}
, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285
 #2: ffff0000e95a40e0 (
&type->s_umount_key#52){.+.+}-{3:3}
, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: 
ffff0000dc7780b0 (&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
6 locks held by syz.5.21/5098:
4 locks held by kworker/u4:10/5108:
 #0: ffff0000c21e0138
 ((wq_completion)writeback){+.+.}-{0:0}
, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283
 #1: ffff8000202a7c00
 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}
, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285
 #2: 
ffff0000d55320e0 (&type->s_umount_key#52){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: ffff0000e96900b0 (
&tree->tree_lock){+.+.}-{3:3}
, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
6 locks held by syz.6.22/5130:
4 locks held by kworker/u4:11/5131:
 #0: 
ffff0000c21e0138
 (
(wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283
 #1: ffff800020237c00 (
(work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}
, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285
 #2: ffff0000cb5a40e0 (&type->s_umount_key#52){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: ffff0000da06c0b0 (
&tree->tree_lock){+.+.}-{3:3}
, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
6 locks held by syz.7.23/5162:
6 locks held by syz.8.24/5201:
1 lock held by syz-executor/5203:
 #0: ffff8000162aea68
 (rtnl_mutex){+.+.}-{3:3}
, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
, at: rtnetlink_rcv_msg+0x98c/0xd04 net/core/rtnetlink.c:5647
3 locks held by kworker/u4:13/5211:
 #0: ffff0000c0029138 (
(wq_completion)events_unbound
){+.+.}-{0:0}
, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283
 #1: ffff800020a27c00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285
 #2: 
ffff8000162aea68 (rtnl_mutex
){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:72

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