BUG: memory leak
unreferenced object 0xffff888039a62bc0 (size 16):
  comm "syz-executor.0", pid 7736, jiffies 4295321107 (age 17.808s)
  hex dump (first 16 bytes):
    28 48 49 45 80 88 ff ff 00 80 85 22 80 88 ff ff  (HIE......."....
  backtrace:
    [<00000000f2631ba7>] kmalloc include/linux/slab.h:552 [inline]
    [<00000000f2631ba7>] ext4_multi_mount_protect+0x861/0xb20 fs/ext4/mmp.c:367
    [<000000004700064f>] ext4_fill_super+0xa20e/0xcf20 fs/ext4/super.c:4774
    [<00000000142a44e2>] mount_bdev+0x331/0x3f0 fs/super.c:1419
    [<00000000af14f77b>] legacy_get_tree+0x105/0x220 fs/fs_context.c:592
    [<000000007c7ac3c5>] vfs_get_tree+0x8e/0x2f0 fs/super.c:1549
    [<00000000f5a1f880>] do_new_mount fs/namespace.c:2881 [inline]
    [<00000000f5a1f880>] path_mount+0x139a/0x2080 fs/namespace.c:3211
    [<000000004ea36657>] do_mount fs/namespace.c:3224 [inline]
    [<000000004ea36657>] __do_sys_mount fs/namespace.c:3432 [inline]
    [<000000004ea36657>] __se_sys_mount fs/namespace.c:3409 [inline]
    [<000000004ea36657>] __x64_sys_mount+0x27e/0x300 fs/namespace.c:3409
    [<00000000f9073d2c>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
    [<000000004455f84f>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: leak checking failed