BUG: memory leak
unreferenced object 0xffff8880088cfe60 (size 16):
  comm "syz-executor.1", pid 27371, jiffies 4297435371 (age 19.452s)
  hex dump (first 16 bytes):
    88 d4 b3 20 80 88 ff ff 00 60 ae 47 80 88 ff ff  ... .....`.G....
  backtrace:
    [<00000000e9864172>] kmalloc include/linux/slab.h:552 [inline]
    [<00000000e9864172>] ext4_multi_mount_protect+0x861/0xb20 fs/ext4/mmp.c:367
    [<00000000233f16d3>] ext4_fill_super+0xa20e/0xcf20 fs/ext4/super.c:4774
    [<00000000fd32a692>] mount_bdev+0x331/0x3f0 fs/super.c:1419
    [<00000000d20d4447>] legacy_get_tree+0x105/0x220 fs/fs_context.c:592
    [<00000000fcf9e51e>] vfs_get_tree+0x8e/0x2f0 fs/super.c:1549
    [<000000008c212949>] do_new_mount fs/namespace.c:2881 [inline]
    [<000000008c212949>] path_mount+0x139a/0x2080 fs/namespace.c:3211
    [<00000000e8e57411>] do_mount fs/namespace.c:3224 [inline]
    [<00000000e8e57411>] __do_sys_mount fs/namespace.c:3432 [inline]
    [<00000000e8e57411>] __se_sys_mount fs/namespace.c:3409 [inline]
    [<00000000e8e57411>] __x64_sys_mount+0x27e/0x300 fs/namespace.c:3409
    [<0000000001fbd4e3>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
    [<0000000061d5f3dd>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: leak checking failed