BUG: memory leak
unreferenced object 0xffff88803a394020 (size 16):
  comm "syz-executor.6", pid 32420, jiffies 4297316830 (age 16.312s)
  hex dump (first 16 bytes):
    70 85 56 44 80 88 ff ff 00 60 56 34 80 88 ff ff  p.VD.....`V4....
  backtrace:
    [<000000000a690b6f>] kmalloc include/linux/slab.h:552 [inline]
    [<000000000a690b6f>] ext4_multi_mount_protect+0x861/0xb20 fs/ext4/mmp.c:367
    [<0000000007c8b87f>] ext4_fill_super+0xa20e/0xcf20 fs/ext4/super.c:4774
    [<000000009a4eb849>] mount_bdev+0x331/0x3f0 fs/super.c:1419
    [<000000007b8a5a8b>] legacy_get_tree+0x105/0x220 fs/fs_context.c:592
    [<00000000b7b607a6>] vfs_get_tree+0x8e/0x2f0 fs/super.c:1549
    [<000000008a7ec9f5>] do_new_mount fs/namespace.c:2881 [inline]
    [<000000008a7ec9f5>] path_mount+0x139a/0x2080 fs/namespace.c:3211
    [<00000000ecb04dc2>] do_mount fs/namespace.c:3224 [inline]
    [<00000000ecb04dc2>] __do_sys_mount fs/namespace.c:3432 [inline]
    [<00000000ecb04dc2>] __se_sys_mount fs/namespace.c:3409 [inline]
    [<00000000ecb04dc2>] __x64_sys_mount+0x27e/0x300 fs/namespace.c:3409
    [<00000000f88028ae>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
    [<00000000f8f140c1>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: leak checking failed