INFO: task syz-executor.5:8256 blocked for more than 143 seconds.
      Not tainted 5.15.146-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.5  state:D stack:    0 pid: 8256 ppid:  4009 flags:0x0000000d
Call trace:
 __switch_to+0x308/0x5e8 arch/arm64/kernel/process.c:518
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0xf10/0x1e48 kernel/sched/core.c:6376
 schedule+0x11c/0x1c8 kernel/sched/core.c:6459
 wb_wait_for_completion+0x160/0x2b4 fs/fs-writeback.c:191
 sync_inodes_sb+0x220/0x944 fs/fs-writeback.c:2770
 sync_filesystem+0x160/0x218 fs/sync.c:64
 generic_shutdown_super+0x70/0x29c fs/super.c:448
 kill_block_super+0x70/0xdc fs/super.c:1414
 deactivate_locked_super+0xb8/0x13c fs/super.c:335
 deactivate_super+0x108/0x128 fs/super.c:366
 cleanup_mnt+0x3c0/0x474 fs/namespace.c:1143
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1150
 task_work_run+0x130/0x1e4 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0x670/0x20bc kernel/exit.c:872
 do_group_exit+0x110/0x268 kernel/exit.c:994
 get_signal+0x634/0x1550 kernel/signal.c:2889
 do_signal arch/arm64/kernel/signal.c:890 [inline]
 do_notify_resume+0x3d0/0x32b8 arch/arm64/kernel/signal.c:943
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline]
 el0_svc+0xfc/0x1f0 arch/arm64/kernel/entry-common.c:609
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffff800014af15e0
 (
rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:268
2 locks held by getty/3727:
 #0: 
ffff0000d32ec098
 (
&tty->ldisc_sem
){++++}-{0:0}
, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340
 #1: 
ffff800018df02e8 (
&ldata->atomic_read_lock
){+.+.}-{3:3}
, at: n_tty_read+0x414/0x1204 drivers/tty/n_tty.c:2158
4 locks held by kworker/u4:8/4801:
 #0: 
ffff0000c21c0138
 (
(wq_completion)writeback
){+.+.}-{0:0}
, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2283
 #1: 
ffff80001e117c00 (
(work_completion)(&(&wb->dwork)->work)
){+.+.}-{0:0}
, at: process_one_work+0x6ac/0x11b8 kernel/workqueue.c:2285
 #2: ffff0000d9572650 (sb_internal#3){.+.+}-{0:0}, at: xfs_bmapi_convert_delalloc+0x1e0/0x1018 fs/xfs/libxfs/xfs_bmap.c:4573
 #3: ffff00011c8980e8 (&xfs_nondir_ilock_class){++++}-{3:3}, at: mrupdate_nested fs/xfs/mrlock.h:36 [inline]
 #3: ffff00011c8980e8 (&xfs_nondir_ilock_class){++++}-{3:3}, at: xfs_ilock+0x26c/0x4c4 fs/xfs/xfs_inode.c:200
2 locks held by kworker/0:11/6761:
2 locks held by syz-executor.5/8256:
 #0: ffff0000d95720e0 (&type->s_umount_key#78){++++}-{3:3}, at: deactivate_super+0x100/0x128 fs/super.c:365
 #1: ffff0000cbf907d8
 (
&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:362 [inline]
&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x208/0x944 fs/fs-writeback.c:2768
1 lock held by syz-executor.5/9091:
 #0: ffff0000d95720e0 (&type->s_umount_key#78){++++}-{3:3}, at: user_get_super+0x11c/0x240 fs/super.c:837
1 lock held by syz-executor.2/9142:
 #0: ffff0000d95720e0
 (&type->s_umount_key
#78){++++}-{3:3}, at: iterate_supers+0xb0/0x1dc fs/super.c:703
1 lock held by syz-executor.2/11812:
 #0: ffff0000d95720e0 (&type->s_umount_key#78){++++}-{3:3}, at: iterate_supers+0xb0/0x1dc fs/super.c:703

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