BUG: memory leak
unreferenced object 0xffff888008aaaa60 (size 16):
  comm "syz-executor.5", pid 6681, jiffies 4295306788 (age 23.120s)
  hex dump (first 16 bytes):
    d0 81 7f 19 80 88 ff ff 00 40 e7 42 80 88 ff ff  .........@.B....
  backtrace:
    [<00000000db7a47bb>] kmalloc include/linux/slab.h:552 [inline]
    [<00000000db7a47bb>] ext4_multi_mount_protect+0x861/0xb20 fs/ext4/mmp.c:367
    [<000000004222c4c1>] ext4_fill_super+0xa20e/0xcf20 fs/ext4/super.c:4774
    [<000000006c626d80>] mount_bdev+0x331/0x3f0 fs/super.c:1419
    [<000000004a58b45d>] legacy_get_tree+0x105/0x220 fs/fs_context.c:592
    [<00000000562c7e31>] vfs_get_tree+0x8e/0x2f0 fs/super.c:1549
    [<00000000693a0afe>] do_new_mount fs/namespace.c:2881 [inline]
    [<00000000693a0afe>] path_mount+0x139a/0x2080 fs/namespace.c:3211
    [<00000000bdd30ba0>] do_mount fs/namespace.c:3224 [inline]
    [<00000000bdd30ba0>] __do_sys_mount fs/namespace.c:3432 [inline]
    [<00000000bdd30ba0>] __se_sys_mount fs/namespace.c:3409 [inline]
    [<00000000bdd30ba0>] __x64_sys_mount+0x27e/0x300 fs/namespace.c:3409
    [<0000000098d648c7>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
    [<00000000bea1bdc9>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: leak checking failed