BUG: memory leak
unreferenced object 0xffff88803bc030c0 (size 16):
  comm "syz-executor.6", pid 30525, jiffies 4297673250 (age 19.108s)
  hex dump (first 16 bytes):
    80 0e bc 3f 80 88 ff ff 00 a0 ef 2f 80 88 ff ff  ...?......./....
  backtrace:
    [<00000000cbef40ce>] kmalloc include/linux/slab.h:552 [inline]
    [<00000000cbef40ce>] ext4_multi_mount_protect+0x861/0xb20 fs/ext4/mmp.c:367
    [<00000000ff5b98b0>] ext4_fill_super+0xa20e/0xcf20 fs/ext4/super.c:4774
    [<00000000625441d3>] mount_bdev+0x331/0x3f0 fs/super.c:1419
    [<00000000d76de869>] legacy_get_tree+0x105/0x220 fs/fs_context.c:592
    [<00000000d5b36906>] vfs_get_tree+0x8e/0x2f0 fs/super.c:1549
    [<0000000018877016>] do_new_mount fs/namespace.c:2881 [inline]
    [<0000000018877016>] path_mount+0x139a/0x2080 fs/namespace.c:3211
    [<00000000ef0cd667>] do_mount fs/namespace.c:3224 [inline]
    [<00000000ef0cd667>] __do_sys_mount fs/namespace.c:3432 [inline]
    [<00000000ef0cd667>] __se_sys_mount fs/namespace.c:3409 [inline]
    [<00000000ef0cd667>] __x64_sys_mount+0x27e/0x300 fs/namespace.c:3409
    [<00000000f42a06cc>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
    [<00000000d16506e6>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: leak checking failed