INFO: task syz-executor.4:7061 blocked for more than 143 seconds.
      Not tainted 6.9.0-rc7-syzkaller-gfda5695d692c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D stack:0     pid:7061  tgid:7061  ppid:1      flags:0x0000000d
Call trace:
 __switch_to+0x314/0x560 arch/arm64/kernel/process.c:553
 context_switch kernel/sched/core.c:5409 [inline]
 __schedule+0x14b8/0x24e8 kernel/sched/core.c:6746
 __schedule_loop kernel/sched/core.c:6823 [inline]
 schedule+0xbc/0x238 kernel/sched/core.c:6838
 schedule_timeout+0xb8/0x348 kernel/time/timer.c:2558
 do_wait_for_common+0x30c/0x468 kernel/sched/completion.c:95
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common kernel/sched/completion.c:127 [inline]
 wait_for_completion+0x48/0x60 kernel/sched/completion.c:148
 btrfs_qgroup_wait_for_completion+0xac/0xdc fs/btrfs/qgroup.c:3958
 close_ctree+0x130/0xb44 fs/btrfs/disk-io.c:4257
 btrfs_put_super+0x70/0x80 fs/btrfs/super.c:73
 generic_shutdown_super+0x128/0x2b8 fs/super.c:641
 kill_anon_super+0x4c/0x7c fs/super.c:1225
 btrfs_kill_super+0x40/0x58 fs/btrfs/super.c:2091
 deactivate_locked_super+0xc4/0x12c fs/super.c:472
 deactivate_super+0xe0/0x100 fs/super.c:505
 cleanup_mnt+0x34c/0x3dc fs/namespace.c:1267
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1274
 task_work_run+0x230/0x2e0 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 do_notify_resume+0x178/0x1f4 arch/arm64/kernel/entry-common.c:151
 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline]
 el0_svc+0xac/0x168 arch/arm64/kernel/entry-common.c:713
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598

Showing all locks held in the system:
4 locks held by kauditd/29:
1 lock held by khungtaskd/30:
 #0: ffff80008f087940 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:328
2 locks held by getty/6009:
 #0: ffff0000d24050a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff800097b9e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41c/0x1228 drivers/tty/n_tty.c:2201
1 lock held by syz-executor.4/7061:
 #0: ffff0000fba8c0e0 (&type->s_umount_key#61){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff0000fba8c0e0 (&type->s_umount_key#61){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff0000fba8c0e0 (&type->s_umount_key#61){+.+.}-{3:3}, at: deactivate_super+0xd8/0x100 fs/super.c:504

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