INFO: task syz-executor:6528 blocked for more than 143 seconds.
      Not tainted 6.16.0-rc2-syzkaller-g9aa9b43d689e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:0     pid:6528  tgid:6528  ppid:1      task_flags:0x400140 flags:0x00000011
Call trace:
 __switch_to+0x414/0x834 arch/arm64/kernel/process.c:737 (T)
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0x1414/0x2a28 kernel/sched/core.c:6785
 __schedule_loop kernel/sched/core.c:6863 [inline]
 schedule+0xb4/0x230 kernel/sched/core.c:6878
 wb_wait_for_completion+0x150/0x280 fs/fs-writeback.c:216
 sync_inodes_sb+0x184/0x870 fs/fs-writeback.c:2833
 sync_filesystem+0x160/0x218 fs/sync.c:64
 generic_shutdown_super+0x70/0x2b8 fs/super.c:622
 kill_block_super+0x44/0x90 fs/super.c:1753
 deactivate_locked_super+0xc4/0x12c fs/super.c:474
 deactivate_super+0xe0/0x100 fs/super.c:507
 cleanup_mnt+0x31c/0x3ac fs/namespace.c:1417
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1424
 task_work_run+0x1dc/0x260 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 do_notify_resume+0x16c/0x1ec 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+0xb4/0x17c arch/arm64/kernel/entry-common.c:768
 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600

Showing all locks held in the system:
1 lock held by khungtaskd/32:
 #0: ffff80008f819e40 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330
3 locks held by kworker/u8:3/42:
2 locks held by pr/ttyAMA0/44:
2 locks held by kworker/u8:11/702:
 #0: ffff0000c231a148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3212
 #1: ffff80009d3f7bc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3212
2 locks held by getty/6296:
 #0: ffff0000cc87f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff8000991e82f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x34c/0xfa4 drivers/tty/n_tty.c:2222
2 locks held by syz-executor/6528:
 #0: ffff0000f75d20e0 (&type->s_umount_key#66){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
 #0: ffff0000f75d20e0 (&type->s_umount_key#66){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
 #0: ffff0000f75d20e0 (&type->s_umount_key#66){++++}-{4:4}, at: deactivate_super+0xd8/0x100 fs/super.c:506
 #1: ffff0000c9f9e7d0 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:387 [inline]
 #1: ffff0000c9f9e7d0 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x16c/0x870 fs/fs-writeback.c:2831
1 lock held by syz.4.340/8291:
 #0: ffff0000f75d20e0 (&type->s_umount_key#66){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline]
 #0: ffff0000f75d20e0 (&type->s_umount_key#66){++++}-{4:4}, at: super_lock+0x240/0x32c fs/super.c:121
4 locks held by udevd/8385:
1 lock held by udevd/8390:
2 locks held by udevd/8408:
2 locks held by udevd/8422:
3 locks held by syz.2.468/9002:
1 lock held by syz.8.470/9014:
 #0: ffff0000d6dbe4d0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:374 [inline]
 #0: ffff0000d6dbe4d0 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x180/0x43c mm/util.c:577
2 locks held by syz.8.470/9015:
1 lock held by syz.7.471/9018:
 #0: ffff0000d6dbf6d0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:374 [inline]
 #0: ffff0000d6dbf6d0 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x180/0x43c mm/util.c:577
1 lock held by syz.7.471/9019:
 #0: ffff0000d6dbf6d0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable+0x28/0x8c include/linux/mmap_lock.h:421
1 lock held by syz.7.471/9020:
1 lock held by syz.5.473/9024:
 #0: ffff0000ca155358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xcc/0xc20 block/bdev.c:945
1 lock held by dhcpcd-run-hook/9025:

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