INFO: task syz-executor:6418 blocked for more than 143 seconds.
      Tainted: G        W          6.13.0-rc6-syzkaller-g6251d1776bc5 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:0     pid:6418  tgid:6418  ppid:1      flags:0x00000001
Call trace:
 __switch_to+0x414/0x788 arch/arm64/kernel/process.c:701 (T)
 context_switch kernel/sched/core.c:5369 [inline]
 __schedule+0x1744/0x27f0 kernel/sched/core.c:6756
 __schedule_loop kernel/sched/core.c:6833 [inline]
 schedule+0xbc/0x238 kernel/sched/core.c:6848
 wb_wait_for_completion+0x154/0x29c fs/fs-writeback.c:216
 __writeback_inodes_sb_nr+0x244/0x2d8 fs/fs-writeback.c:2735
 writeback_inodes_sb_nr fs/fs-writeback.c:2752 [inline]
 writeback_inodes_sb+0x7c/0x90 fs/fs-writeback.c:2767
 sync_filesystem+0xa0/0x218 fs/sync.c:54
 generic_shutdown_super+0x70/0x2bc fs/super.c:621
 bch2_kill_sb+0x40/0x58 fs/bcachefs/fs.c:2278
 deactivate_locked_super+0xc4/0x12c fs/super.c:473
 deactivate_super+0xe0/0x100 fs/super.c:506
 cleanup_mnt+0x34c/0x3dc fs/namespace.c:1373
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1380
 task_work_run+0x230/0x2e0 kernel/task_work.c:239
 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:745
 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600

Showing all locks held in the system:
2 locks held by kworker/u8:0/11:
1 lock held by khungtaskd/31:
 #0: ffff80008fb83160 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:336
2 locks held by kworker/u8:7/687:
 #0: ffff0000c20f6948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x60c/0x15cc kernel/workqueue.c:3203
 #1: ffff80009c6b7c20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6a4/0x15cc kernel/workqueue.c:3203
2 locks held by getty/6177:
 #0: ffff0000cd06d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff80009ba1b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41c/0x1228 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/6418:
 #0: ffff0000d48580e0 (&type->s_umount_key#56){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff0000d48580e0 (&type->s_umount_key#56){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff0000d48580e0 (&type->s_umount_key#56){++++}-{4:4}, at: deactivate_super+0xd8/0x100 fs/super.c:505
4 locks held by bch-reclaim/loo/7084:
 #0: ffff0000f64cb0a8 (&j->reclaim_lock){+.+.}-{4:4}, at: bch2_journal_reclaim_thread+0x144/0x4b8 fs/bcachefs/journal_reclaim.c:739
 #1: ffff0000f6484398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_lock_acquire+0x18/0x54 include/linux/srcu.h:157
 #2: ffff0000f6484740 (&wb->flushing.lock){+.+.}-{4:4}, at: btree_write_buffer_flush_seq+0x10fc/0x1254 fs/bcachefs/btree_write_buffer.c:516
 #3: ffff0000f64a66d0 (&c->gc_lock){++++}-{4:4}, at: bch2_btree_update_start+0x588/0x15ac fs/bcachefs/btree_update_interior.c:1197

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