INFO: task syz.2.566:8793 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.566       state:D stack:0     pid:8793  tgid:8792  ppid:6556   task_flags:0x400040 flags:0x00800001
Call trace:
 __switch_to+0x418/0x87c arch/arm64/kernel/process.c:741 (T)
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x13b0/0x2864 kernel/sched/core.c:6929
 __schedule_loop kernel/sched/core.c:7011 [inline]
 schedule+0xb4/0x230 kernel/sched/core.c:7026
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7083
 __mutex_lock_common+0xd04/0x2678 kernel/locking/mutex.c:676
 __mutex_lock kernel/locking/mutex.c:760 [inline]
 mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:812
 bdev_open+0xcc/0xc20 block/bdev.c:945
 blkdev_open+0x364/0x4e8 block/fops.c:701
 do_dentry_open+0x7a4/0x10bc fs/open.c:965
 vfs_open+0x44/0x2d4 fs/open.c:1097
 do_open fs/namei.c:3975 [inline]
 path_openat+0x2424/0x2c40 fs/namei.c:4134
 do_filp_open+0x18c/0x36c fs/namei.c:4161
 do_sys_openat2+0x11c/0x1b4 fs/open.c:1437
 do_sys_open fs/open.c:1452 [inline]
 __do_sys_openat fs/open.c:1468 [inline]
 __se_sys_openat fs/open.c:1463 [inline]
 __arm64_sys_openat+0x120/0x158 fs/open.c:1463
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

Showing all locks held in the system:
1 lock held by khungtaskd/32:
 #0: ffff80008f76b5a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330
1 lock held by pr/ttyAMA-1/43:
2 locks held by getty/6335:
 #0: ffff0000d295e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff80009bb2e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x34c/0xfa4 drivers/tty/n_tty.c:2222
1 lock held by udevd/6544:
 #0: ffff0000cb679358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xcc/0xc20 block/bdev.c:945
1 lock held by udevd/6691:
 #0: ffff0000cbd5d358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xcc/0xc20 block/bdev.c:945
1 lock held by udevd/6709:
 #0: ffff0000cb67d358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xcc/0xc20 block/bdev.c:945
1 lock held by udevd/7385:
 #0: ffff0000cbc9d358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xcc/0xc20 block/bdev.c:945
1 lock held by udevd/7473:
 #0: ffff0000cb775358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xcc/0xc20 block/bdev.c:945
1 lock held by udevd/7475:
 #0: ffff0000cbd59358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xcc/0xc20 block/bdev.c:945
1 lock held by udevd/7476:
 #0: ffff0000cbc99358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xcc/0xc20 block/bdev.c:945
3 locks held by kworker/u8:18/7498:
1 lock held by syz.2.566/8793:
 #0: ffff0000cb679358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xcc/0xc20 block/bdev.c:945
2 locks held by syz.3.1231/11362:
 #0: ffff0000da70a0e0 (&type->s_umount_key#93/1){+.+.}-{4:4}, at: alloc_super+0x168/0x7d4 fs/super.c:344
 #1: ffff0000cb67d358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xcc/0xc20 block/bdev.c:945
1 lock held by syz.0.1388/11967:
2 locks held by syz.5.1391/11970:

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