BUG: memory leak
unreferenced object 0xffff88804b034ca0 (size 16):
  comm "syz-executor.0", pid 15764, jiffies 4296559038 (age 22.738s)
  hex dump (first 16 bytes):
    40 97 58 20 80 88 ff ff 00 80 42 4f 80 88 ff ff  @.X ......BO....
  backtrace:
    [<0000000025a981f9>] kmalloc include/linux/slab.h:552 [inline]
    [<0000000025a981f9>] ext4_multi_mount_protect+0x861/0xb20 fs/ext4/mmp.c:367
    [<00000000a5063750>] ext4_fill_super+0xa20e/0xcf20 fs/ext4/super.c:4774
    [<00000000ff1475c0>] mount_bdev+0x331/0x3f0 fs/super.c:1419
    [<00000000b36e8f0c>] legacy_get_tree+0x105/0x220 fs/fs_context.c:592
    [<00000000fd8f5d8e>] vfs_get_tree+0x8e/0x2f0 fs/super.c:1549
    [<00000000cc369c53>] do_new_mount fs/namespace.c:2881 [inline]
    [<00000000cc369c53>] path_mount+0x139a/0x2080 fs/namespace.c:3211
    [<000000000a3d0ea8>] do_mount fs/namespace.c:3224 [inline]
    [<000000000a3d0ea8>] __do_sys_mount fs/namespace.c:3432 [inline]
    [<000000000a3d0ea8>] __se_sys_mount fs/namespace.c:3409 [inline]
    [<000000000a3d0ea8>] __x64_sys_mount+0x27e/0x300 fs/namespace.c:3409
    [<0000000095d5edbd>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
    [<00000000923d0186>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: leak checking failed