BUG: memory leak
unreferenced object 0xffff8880091040c0 (size 16):
  comm "syz-executor.2", pid 18412, jiffies 4297530370 (age 16.904s)
  hex dump (first 16 bytes):
    10 39 c3 44 80 88 ff ff 00 20 99 42 80 88 ff ff  .9.D..... .B....
  backtrace:
    [<000000009ce86f1a>] kmalloc include/linux/slab.h:552 [inline]
    [<000000009ce86f1a>] ext4_multi_mount_protect+0x861/0xb20 fs/ext4/mmp.c:367
    [<00000000759cc69b>] ext4_fill_super+0xa20e/0xcf20 fs/ext4/super.c:4774
    [<000000003b36b055>] mount_bdev+0x331/0x3f0 fs/super.c:1419
    [<00000000cb196256>] legacy_get_tree+0x105/0x220 fs/fs_context.c:592
    [<00000000c64f2c08>] vfs_get_tree+0x8e/0x2f0 fs/super.c:1549
    [<00000000994dfe61>] do_new_mount fs/namespace.c:2881 [inline]
    [<00000000994dfe61>] path_mount+0x139a/0x2080 fs/namespace.c:3211
    [<000000009ad31320>] do_mount fs/namespace.c:3224 [inline]
    [<000000009ad31320>] __do_sys_mount fs/namespace.c:3432 [inline]
    [<000000009ad31320>] __se_sys_mount fs/namespace.c:3409 [inline]
    [<000000009ad31320>] __x64_sys_mount+0x27e/0x300 fs/namespace.c:3409
    [<0000000099b559f3>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
    [<00000000ea4ef22b>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: leak checking failed