INFO: task syz-executor.0:30649 blocked for more than 430 seconds.
      Not tainted 5.15.0-syzkaller-12999-gc8c109546a19 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:    0 pid:30649 ppid:  2202 flags:0x00000009
Call trace:
 __switch_to+0x264/0x3a4 arch/arm64/kernel/process.c:526
 context_switch kernel/sched/core.c:4969 [inline]
 __schedule+0x868/0x1c14 kernel/sched/core.c:6250
 schedule+0xfc/0x2fc kernel/sched/core.c:6323
 blk_mq_freeze_queue_wait+0xf4/0x130 block/blk-mq.c:178
 del_gendisk+0x418/0x680 block/genhd.c:623
 loop_remove+0x38/0xf0 drivers/block/loop.c:2080
 loop_control_remove drivers/block/loop.c:2137 [inline]
 loop_control_ioctl+0x338/0x3bc drivers/block/loop.c:2175
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __arm64_sys_ioctl+0x120/0x18c fs/ioctl.c:860
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x6c/0x260 arch/arm64/kernel/syscall.c:52
 el0_svc_common.constprop.0+0xc4/0x254 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0xa0/0xcc arch/arm64/kernel/syscall.c:181
 el0_svc+0x64/0x280 arch/arm64/kernel/entry-common.c:603
 el0t_64_sync_handler+0x1a4/0x1b0 arch/arm64/kernel/entry-common.c:621
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:572

Showing all locks held in the system:
1 lock held by khungtaskd/26:
 #0: ffff800015f7f760 (rcu_read_lock){....}-{1:2}, at: __preempt_count_add arch/arm64/include/asm/preempt.h:48 [inline]
 #0: ffff800015f7f760 (rcu_read_lock){....}-{1:2}, at: __rcu_read_lock include/linux/rcupdate.h:68 [inline]
 #0: ffff800015f7f760 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:686 [inline]
 #0: ffff800015f7f760 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0xd4/0x368 kernel/locking/lockdep.c:6464
no locks held by klogd/1997.
2 locks held by getty/2156:
 #0: ffff00000e3d6098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x50 drivers/tty/tty_ldsem.c:340
 #1: ffff80001899b2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x810/0xbe0 drivers/tty/n_tty.c:2113

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