BUG: memory leak
unreferenced object 0xffff888021d26340 (size 16):
  comm "syz-executor.0", pid 5347, jiffies 4294973743 (age 16.105s)
  hex dump (first 16 bytes):
    10 99 96 20 80 88 ff ff 00 a0 9f 42 80 88 ff ff  ... .......B....
  backtrace:
    [<00000000a2772e90>] kmalloc include/linux/slab.h:552 [inline]
    [<00000000a2772e90>] ext4_multi_mount_protect+0x861/0xb20 fs/ext4/mmp.c:367
    [<000000007cb2ee9b>] ext4_fill_super+0xa20e/0xcf20 fs/ext4/super.c:4774
    [<0000000084d5a062>] mount_bdev+0x331/0x3f0 fs/super.c:1419
    [<00000000bd213053>] legacy_get_tree+0x105/0x220 fs/fs_context.c:592
    [<00000000a32a12b0>] vfs_get_tree+0x8e/0x2f0 fs/super.c:1549
    [<00000000d723926c>] do_new_mount fs/namespace.c:2881 [inline]
    [<00000000d723926c>] path_mount+0x139a/0x2080 fs/namespace.c:3211
    [<0000000087bd1c6a>] do_mount fs/namespace.c:3224 [inline]
    [<0000000087bd1c6a>] __do_sys_mount fs/namespace.c:3432 [inline]
    [<0000000087bd1c6a>] __se_sys_mount fs/namespace.c:3409 [inline]
    [<0000000087bd1c6a>] __x64_sys_mount+0x27e/0x300 fs/namespace.c:3409
    [<00000000dbbfe60d>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
    [<000000003d18a6e2>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: leak checking failed