BUG: memory leak
unreferenced object 0xffff888009181020 (size 16):
  comm "syz-executor.3", pid 7446, jiffies 4295354590 (age 20.976s)
  hex dump (first 16 bytes):
    b8 c2 26 45 80 88 ff ff 00 c0 66 47 80 88 ff ff  ..&E......fG....
  backtrace:
    [<0000000059de5152>] kmalloc include/linux/slab.h:552 [inline]
    [<0000000059de5152>] ext4_multi_mount_protect+0x861/0xb20 fs/ext4/mmp.c:367
    [<000000004beca353>] ext4_fill_super+0xa20e/0xcf20 fs/ext4/super.c:4774
    [<0000000067a921d1>] mount_bdev+0x331/0x3f0 fs/super.c:1419
    [<0000000021880ef8>] legacy_get_tree+0x105/0x220 fs/fs_context.c:592
    [<00000000a8ea0470>] vfs_get_tree+0x8e/0x2f0 fs/super.c:1549
    [<0000000039efe8f0>] do_new_mount fs/namespace.c:2881 [inline]
    [<0000000039efe8f0>] path_mount+0x139a/0x2080 fs/namespace.c:3211
    [<0000000080be43a7>] do_mount fs/namespace.c:3224 [inline]
    [<0000000080be43a7>] __do_sys_mount fs/namespace.c:3432 [inline]
    [<0000000080be43a7>] __se_sys_mount fs/namespace.c:3409 [inline]
    [<0000000080be43a7>] __x64_sys_mount+0x27e/0x300 fs/namespace.c:3409
    [<000000009915a4fb>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
    [<00000000a8a920e7>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: leak checking failed