BUG: memory leak
unreferenced object 0xffff88800e9b5b00 (size 16):
  comm "syz-executor.7", pid 10200, jiffies 4295722530 (age 16.435s)
  hex dump (first 16 bytes):
    e8 d0 9f 20 80 88 ff ff 00 a0 c8 21 80 88 ff ff  ... .......!....
  backtrace:
    [<0000000062488525>] kmalloc include/linux/slab.h:552 [inline]
    [<0000000062488525>] ext4_multi_mount_protect+0x861/0xb20 fs/ext4/mmp.c:367
    [<0000000038f23500>] ext4_fill_super+0xa20e/0xcf20 fs/ext4/super.c:4774
    [<00000000911cd15a>] mount_bdev+0x331/0x3f0 fs/super.c:1419
    [<00000000b9a067f9>] legacy_get_tree+0x105/0x220 fs/fs_context.c:592
    [<00000000075c35c6>] vfs_get_tree+0x8e/0x2f0 fs/super.c:1549
    [<00000000542f65ba>] do_new_mount fs/namespace.c:2881 [inline]
    [<00000000542f65ba>] path_mount+0x139a/0x2080 fs/namespace.c:3211
    [<000000004060071f>] do_mount fs/namespace.c:3224 [inline]
    [<000000004060071f>] __do_sys_mount fs/namespace.c:3432 [inline]
    [<000000004060071f>] __se_sys_mount fs/namespace.c:3409 [inline]
    [<000000004060071f>] __x64_sys_mount+0x27e/0x300 fs/namespace.c:3409
    [<0000000073d5d7f3>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
    [<000000007a94d203>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: leak checking failed