EXT4-fs warning (device loop5): ext4_multi_mount_protect:329: MMP startup interrupted, failing mount
EXT4-fs warning (device loop2): ext4_multi_mount_protect:329: MMP startup interrupted, failing mount
INFO: task syz-executor.6:16909 blocked for more than 143 seconds.
      Not tainted 5.10.56 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.6  state:D stack:27616 pid:16909 ppid:   409 flags:0x10004004
Call Trace:
 context_switch kernel/sched/core.c:3776 [inline]
 __schedule+0x848/0x1e80 kernel/sched/core.c:4525
 schedule+0xcb/0x270 kernel/sched/core.c:4603
 schedule_timeout+0x366/0x3f0 kernel/time/timer.c:1848
 do_wait_for_common kernel/sched/completion.c:85 [inline]
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x168/0x270 kernel/sched/completion.c:138
 kthread_stop+0x160/0x610 kernel/kthread.c:621
 ext4_stop_mmpd+0x47/0xd0 fs/ext4/mmp.c:254
 ext4_fill_super+0x8208/0xcf70 fs/ext4/super.c:5176
 mount_bdev+0x331/0x3f0 fs/super.c:1419
 legacy_get_tree+0x105/0x220 fs/fs_context.c:592
 vfs_get_tree+0x8e/0x2f0 fs/super.c:1549
 do_new_mount fs/namespace.c:2881 [inline]
 path_mount+0x139a/0x2080 fs/namespace.c:3211
 do_mount fs/namespace.c:3224 [inline]
 __do_sys_mount fs/namespace.c:3432 [inline]
 __se_sys_mount fs/namespace.c:3409 [inline]
 __x64_sys_mount+0x27e/0x300 fs/namespace.c:3409
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x467b2a
RSP: 002b:00007ffa217c3fa8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 0000000000467b2a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffa217c4000
RBP: 00007ffa217c4040 R08: 00007ffa217c4040 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 00007ffa217c4000 R15: 0000000020012f00

Showing all locks held in the system:
1 lock held by khungtaskd/23:
 #0: ffffffff84df6660 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:6377
1 lock held by in:imklog/384:
2 locks held by agetty/232:
 #0: ffff8880190f3098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:266
 #1: ffffc900007bf2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xdca/0x1320 drivers/tty/n_tty.c:2174
1 lock held by syz-executor.6/16909:
 #0: ffff88800c3ae0e0 (&type->s_umount_key#21/1){+.+.}-{3:3}, at: alloc_super+0x1b3/0xa10 fs/super.c:229

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