INFO: task syz-executor.4:6022 blocked for more than 143 seconds.
      Not tainted 6.4.0-rc7-syzkaller-ge40939bbfc68 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D stack:0     pid:6022  ppid:1      flags:0x0000000d
Call trace:
 __switch_to+0x320/0x754 arch/arm64/kernel/process.c:556
 context_switch kernel/sched/core.c:5343 [inline]
 __schedule+0x1368/0x23b8 kernel/sched/core.c:6669
 schedule+0xc4/0x170 kernel/sched/core.c:6745
 wb_wait_for_completion+0x154/0x29c fs/fs-writeback.c:192
 sync_inodes_sb+0x220/0x944 fs/fs-writeback.c:2730
 sync_filesystem+0x160/0x218 fs/sync.c:64
 generic_shutdown_super+0x70/0x328 fs/super.c:473
 kill_block_super+0x70/0xdc fs/super.c:1407
 deactivate_locked_super+0xac/0x124 fs/super.c:331
 deactivate_super+0xe0/0x100 fs/super.c:362
 cleanup_mnt+0x34c/0x3dc fs/namespace.c:1177
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1184
 task_work_run+0x230/0x2e0 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 do_notify_resume+0x2180/0x3c90 arch/arm64/kernel/signal.c:1305
 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:144 [inline]
 el0_svc+0x94/0x160 arch/arm64/kernel/entry-common.c:648
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:665
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591

Showing all locks held in the system:
4 locks held by kworker/u4:0/10:
1 lock held by rcu_tasks_kthre/13:
 #0: ffff80008e0916d0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xcf4 kernel/rcu/tasks.h:518
1 lock held by rcu_tasks_trace/14:
 #0: ffff80008e091a90 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xcf4 kernel/rcu/tasks.h:518
1 lock held by khungtaskd/28:
 #0: ffff80008e091500 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:326
2 locks held by getty/5733:
 #0: ffff0000cef9d098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff800092e302f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1210 drivers/tty/n_tty.c:2176
2 locks held by syz-executor.4/6022:
 #0: ffff00012fe120e0 (&type->s_umount_key#29){++++}-{3:3}, at: deactivate_super+0xd8/0x100 fs/super.c:361
 #1: ffff0000cd15e7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:364 [inline]
 #1: ffff0000cd15e7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x208/0x944 fs/fs-writeback.c:2728
5 locks held by kworker/0:6/6077:
 #0: ffff0001b4237b58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:558 [inline]
 #0: ffff0001b4237b58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1366 [inline]
 #0: ffff0001b4237b58 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1653 [inline]
 #0: ffff0001b4237b58 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x2d8/0x23b8 kernel/sched/core.c:6586
 #1: ffff0001b4223e08 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x3c0/0x618 kernel/sched/psi.c:996
 #2: ffff0001b4224c18 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x108/0x214 kernel/time/timer.c:999
 #3: ffff8000924c8378 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x14c/0x7c8 lib/debugobjects.c:708
 #4: ffff80009246d880 (&obj_hash[i].lock){-.-.}-{2:2}, at: __debug_check_no_obj_freed lib/debugobjects.c:1011 [inline]
 #4: ffff80009246d880 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_check_no_obj_freed+0x14c/0x528 lib/debugobjects.c:1054
3 locks held by kworker/u4:12/6796:

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