INFO: task syz.0.227:5885 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.227       state:D stack:0     pid:5885  tgid:5883  ppid:4716   task_flags:0x400140 flags:0x00800001
Call trace:
 __switch_to+0x2b4/0x6e4 arch/arm64/kernel/process.c:775 (T)
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x135c/0x2b00 kernel/sched/core.c:7284
 __schedule_loop kernel/sched/core.c:7361 [inline]
 schedule+0x13c/0x20c kernel/sched/core.c:7376
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7433
 __mutex_lock_common kernel/locking/mutex.c:726 [inline]
 __mutex_lock+0x5d4/0x1078 kernel/locking/mutex.c:821
 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874
 bdev_open+0xc4/0x880 block/bdev.c:990
 blkdev_open+0x2d4/0x408 block/fops.c:674
 do_dentry_open+0x5c4/0xfbc fs/open.c:996
 vfs_open+0x44/0x2dc fs/open.c:1101
 do_open fs/namei.c:4837 [inline]
 path_openat+0x1084/0x18f0 fs/namei.c:5000
 do_file_open+0x1c8/0x2e8 fs/namei.c:5029
 do_sys_openat2+0x114/0x1e8 fs/open.c:1417
 do_sys_open+0xb0/0xe0 fs/open.c:1423
 __do_sys_openat fs/open.c:1439 [inline]
 __se_sys_openat fs/open.c:1434 [inline]
 __arm64_sys_openat+0xa8/0xc4 fs/open.c:1434
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606

Showing all locks held in the system:
locks held by khungtaskd/31: 1, last CPU#0:
 #0: ffff800088c618e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffff800088c618e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffff800088c618e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x4c/0x188 kernel/locking/lockdep.c:6871
locks held by getty/4489: 2, on CPU#1:
 #0: ffff0000cdb9e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff80009245b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x348/0xf78 drivers/tty/n_tty.c:2211
locks held by syz-executor/4705: 1, last CPU#1:
 #0: ffff0000c9fd2460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:494
locks held by udevd/5268: 1, on CPU#0:
 #0: ffff0000c7114350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xc4/0x880 block/bdev.c:990
locks held by udevd/5269: 1, on CPU#1:
 #0: ffff0000c766c350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xc4/0x880 block/bdev.c:990
locks held by udevd/5270: 1, on CPU#1:
 #0: ffff0000c7110350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xc4/0x880 block/bdev.c:990
locks held by udevd/5807: 1, on CPU#1:
 #0: ffff0000c7128350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xc4/0x880 block/bdev.c:990
locks held by udevd/5808: 1, on CPU#1:
 #0: ffff0000c712c350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xc4/0x880 block/bdev.c:990
locks held by udevd/5810: 1, on CPU#0:
 #0: ffff0000c7238350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xc4/0x880 block/bdev.c:990
locks held by udevd/5812: 1, on CPU#1:
 #0: ffff0000c723c350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xc4/0x880 block/bdev.c:990
locks held by udevd/5818: 1, on CPU#1:
 #0: ffff0000c78b0350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xc4/0x880 block/bdev.c:990
locks held by udevd/5821: 1, on CPU#1:
 #0: ffff0000c78b4350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xc4/0x880 block/bdev.c:990
locks held by udevd/5826: 1, on CPU#1:
 #0: ffff0000c7800350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xc4/0x880 block/bdev.c:990
locks held by udevd/5827: 1, on CPU#0:
 #0: ffff0000c7804350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xc4/0x880 block/bdev.c:990
locks held by udevd/5828: 1, on CPU#1:
 #0: ffff0000c72a8350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xc4/0x880 block/bdev.c:990
locks held by syz.0.227/5885: 1, on CPU#1:
 #0: ffff0000c766c350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xc4/0x880 block/bdev.c:990
locks held by syz.9.1119/9401: 1, last CPU#1:
 #0: ffff0000cd450300 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:600 [inline]
 #0: ffff0000cd450300 (&mm->mmap_lock){++++}-{4:4}, at: __mm_populate+0x144/0x328 mm/gup.c:1942
locks held by syz.7.1122/9417: 2, last CPU#0:
 #0: ffff0000d6b1ad00 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:562 [inline]
 #0: ffff0000d6b1ad00 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1a8/0x46c mm/util.c:579
 #1: ffff800088c618e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #1: ffff800088c618e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffff800088c618e0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x4c/0x224 mm/pgtable-generic.c:290

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