INFO: task kworker/u4:2:39 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:39    ppid:2      flags:0x00000008
Workqueue: writeback wb_workfn
 (flush-7:1)

Call trace:
 __switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0xddc/0x1b18 kernel/sched/core.c:6561
 schedule+0xc4/0x170 kernel/sched/core.c:6637
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6696
 __mutex_lock_common+0xad4/0x1f38 kernel/locking/mutex.c:679
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
 hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
 hfsplus_cat_write_inode+0x1a0/0x6a0 fs/hfsplus/inode.c:590
 hfsplus_write_inode+0x154/0x4c8 fs/hfsplus/super.c:160
 write_inode fs/fs-writeback.c:1460 [inline]
 __writeback_single_inode+0x5e0/0x157c fs/fs-writeback.c:1677
 writeback_sb_inodes+0x824/0x1404 fs/fs-writeback.c:1903
 __writeback_inodes_wb+0x110/0x394 fs/fs-writeback.c:1974
 wb_writeback+0x414/0xfb0 fs/fs-writeback.c:2079
 wb_check_background_flush fs/fs-writeback.c:2145 [inline]
 wb_do_writeback fs/fs-writeback.c:2233 [inline]
 wb_workfn+0xac0/0xd98 fs/fs-writeback.c:2260
 process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292
 worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
INFO: task kworker/u4:5:4398 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:5    state:D stack:0     pid:4398  ppid:2      flags:0x00000008
Workqueue: writeback wb_workfn (flush-7:0)

Call trace:
 __switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0xddc/0x1b18 kernel/sched/core.c:6561
 schedule+0xc4/0x170 kernel/sched/core.c:6637
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6696
 __mutex_lock_common+0xad4/0x1f38 kernel/locking/mutex.c:679
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
 hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
 hfsplus_cat_write_inode+0x1a0/0x6a0 fs/hfsplus/inode.c:590
 hfsplus_write_inode+0x154/0x4c8 fs/hfsplus/super.c:160
 write_inode fs/fs-writeback.c:1460 [inline]
 __writeback_single_inode+0x5e0/0x157c fs/fs-writeback.c:1677
 writeback_sb_inodes+0x824/0x1404 fs/fs-writeback.c:1903
 __writeback_inodes_wb+0x110/0x394 fs/fs-writeback.c:1974
 wb_writeback+0x414/0xfb0 fs/fs-writeback.c:2079
 wb_check_background_flush fs/fs-writeback.c:2145 [inline]
 wb_do_writeback fs/fs-writeback.c:2233 [inline]
 wb_workfn+0xac0/0xd98 fs/fs-writeback.c:2260
 process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292
 worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850

Showing all locks held in the system:
4 locks held by kworker/u4:0/9:
 #0: 
ffff0000c0c48938
 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x6b4/0x13a8 kernel/workqueue.c:2265
 #1: ffff80001c847c20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6f8/0x13a8 kernel/workqueue.c:2267
 #2: ffff0000dd9f20e0 (&type->s_umount_key#51){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:415
 #3: ffff0000cd5f00b0 (&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
4 locks held by kworker/u4:1/11:
 #0: ffff0000c0c48938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x6b4/0x13a8 kernel/workqueue.c:2265
 #1: ffff80001c867c20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6f8/0x13a8 kernel/workqueue.c:2267
 #2: ffff0000ce03a0e0 (&type->s_umount_key#51){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:415
 #3: ffff0000d84680b0 (&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
1 lock held by rcu_tasks_kthre/12:
 #0: ffff800015277770 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x40/0xbb4 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
 #0: 
ffff800015277f90
 (
rcu_tasks_trace.tasks_gp_mutex
){+.+.}-{3:3}
, at: rcu_tasks_one_gp+0x40/0xbb4 kernel/rcu/tasks.h:517
1 lock held by khungtaskd/28:
 #0: 
ffff800015276e00
 (
rcu_read_lock){....}-{1:2}
, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:349
4 locks held by kworker/u4:2/39:
 #0: 
ffff0000c0c48938
 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x6b4/0x13a8 kernel/workqueue.c:2265
 #1: 
ffff80001cd67c20 (
(work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}
, at: process_one_work+0x6f8/0x13a8 kernel/workqueue.c:2267
 #2: ffff0000c39340e0 (&type->s_umount_key#51){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:415
 #3: ffff0000dabf60b0 (&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
4 locks held by kworker/u4:3/106:
 #0: ffff0000c0c48938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x6b4/0x13a8 kernel/workqueue.c:2265
 #1: ffff8000203e7c20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6f8/0x13a8 kernel/workqueue.c:2267
 #2: ffff0000d957c0e0 (&type->s_umount_key#51){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:415
 #3: 
ffff0000d59300b0 (&tree->tree_lock
){+.+.}-{3:3}
, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
4 locks held by kworker/u4:4/152:
 #0: 
ffff0000c0c48938
 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x6b4/0x13a8 kernel/workqueue.c:2265
 #1: ffff8000203f7c20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6f8/0x13a8 kernel/workqueue.c:2267
 #2: ffff0000d8fee0e0 (&type->s_umount_key#51){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:415
 #3: ffff0000ead1a0b0 (&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
1 lock held by syslogd/3911:
 #0: 
ffff00019f6f4198
 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:537 [inline]
 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1355 [inline]
 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1645 [inline]
 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x2b8/0x1b18 kernel/sched/core.c:6477
2 locks held by getty/4069:
 #0: ffff0000d663f098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff80002067b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x2ec/0xf9c drivers/tty/n_tty.c:2198
4 locks held by kworker/u4:5/4398:
 #0: 
ffff0000c0c48938
 (
(wq_completion)writeback
){+.+.}-{0:0}
, at: process_one_work+0x6b4/0x13a8 kernel/workqueue.c:2265
 #1: 
ffff8000211d7c20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6f8/0x13a8 kernel/workqueue.c:2267
 #2: 
ffff0000df4d80e0 (
&type->s_umount_key#51
){.+.+}-{3:3}
, at: trylock_super+0x24/0xf4 fs/super.c:415
 #3: 
ffff0000daf1c0b0
 (&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
4 locks held by kworker/u4:7/5185:
 #0: 
ffff0000c0c48938
 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x6b4/0x13a8 kernel/workqueue.c:2265
 #1: 
ffff800021487c20
 (
(work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6f8/0x13a8 kernel/workqueue.c:2267
 #2: ffff0000c3dee0e0 (&type->s_umount_key#51){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:415
 #3: ffff0000c40040b0 (&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
4 locks held by syz.0.16/5192:
4 locks held by syz.1.17/5216:
4 locks held by syz.2.18/5237:
4 locks held by syz.3.19/5263:
4 locks held by kworker/u4:8/5286:
 #0: 
ffff0000c0c48938
 (
(wq_completion)writeback
){+.+.}-{0:0}
, at: process_one_work+0x6b4/0x13a8 kernel/workqueue.c:2265
 #1: 
ffff8000219e7c20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6f8/0x13a8 kernel/workqueue.c:2267
 #2: 
ffff0000ef56a0e0 (
&type->s_umount_key#51
){.+.+}-{3:3}
, at: trylock_super+0x24/0xf4 fs/super.c:415
 #3: 
ffff0000d5daa0b0
 (&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
4 locks held by syz.4.20/5298:
4 locks held by kworker/u4:9/5299:
 #0: 
ffff0000c0c48938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x6b4/0x13a8 kernel/workqueue.c:2265
 #1: ffff800021a27c20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6f8/0x13a8 kernel/workqueue.c:2267
 #2: ffff0000f06d20e0 (&type->s_umount_key#51){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:415
 #3: ffff0000d88080b0 (&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
4 locks held by syz.5.21/5330:
4 locks held by syz.6.22/5362:
4 locks held by kworker/u4:11/5364:
 #0: 
ffff0000c0c48938 ((wq_completion)writeback){+.+.}-{0:0}
, at: process_one_work+0x6b4/0x13a8 kernel/workqueue.c:2265
 #1: 
ffff800021b57c20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6f8/0x13a8 kernel/workqueue.c:2267
 #2: 
ffff0000f44f60e0 (
&type->s_umount_key#51
){.+.+}-{3:3}
, at: trylock_super+0x24/0xf4 fs/super.c:415
 #3: 
ffff0000f44f20b0
 (&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
4 locks held by syz.7.23/5403:
3 locks held by kworker/u4:13/5434:
4 locks held by syz.8.24/5436:
4 locks held by syz.9.25/5468:

=============================================