BUG: memory leak
unreferenced object 0xffff888046386fa0 (size 16):
  comm "syz-executor.7", pid 24377, jiffies 4296851839 (age 21.373s)
  hex dump (first 16 bytes):
    28 08 00 48 80 88 ff ff 00 60 ec 37 80 88 ff ff  (..H.....`.7....
  backtrace:
    [<000000009e7a4776>] kmalloc include/linux/slab.h:552 [inline]
    [<000000009e7a4776>] ext4_multi_mount_protect+0x861/0xb20 fs/ext4/mmp.c:367
    [<00000000f05ba1e2>] ext4_fill_super+0xa20e/0xcf20 fs/ext4/super.c:4774
    [<0000000094b91871>] mount_bdev+0x331/0x3f0 fs/super.c:1419
    [<00000000502a5cae>] legacy_get_tree+0x105/0x220 fs/fs_context.c:592
    [<00000000a861ed3a>] vfs_get_tree+0x8e/0x2f0 fs/super.c:1549
    [<000000000e870d3b>] do_new_mount fs/namespace.c:2881 [inline]
    [<000000000e870d3b>] path_mount+0x139a/0x2080 fs/namespace.c:3211
    [<0000000066b49daf>] do_mount fs/namespace.c:3224 [inline]
    [<0000000066b49daf>] __do_sys_mount fs/namespace.c:3432 [inline]
    [<0000000066b49daf>] __se_sys_mount fs/namespace.c:3409 [inline]
    [<0000000066b49daf>] __x64_sys_mount+0x27e/0x300 fs/namespace.c:3409
    [<0000000020de1424>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
    [<00000000f814d98c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: leak checking failed