BUG: memory leak
unreferenced object 0xffff8880143c6c60 (size 16):
  comm "syz-executor.1", pid 8244, jiffies 4296821094 (age 23.269s)
  hex dump (first 16 bytes):
    b8 82 74 46 80 88 ff ff 00 80 fc 33 80 88 ff ff  ..tF.......3....
  backtrace:
    [<00000000c4d0bf6d>] kmalloc include/linux/slab.h:552 [inline]
    [<00000000c4d0bf6d>] ext4_multi_mount_protect+0x861/0xb20 fs/ext4/mmp.c:367
    [<00000000d1642f9b>] ext4_fill_super+0xa20e/0xcf20 fs/ext4/super.c:4774
    [<000000001765f660>] mount_bdev+0x331/0x3f0 fs/super.c:1419
    [<0000000082896ebb>] legacy_get_tree+0x105/0x220 fs/fs_context.c:592
    [<000000005fe9d1ec>] vfs_get_tree+0x8e/0x2f0 fs/super.c:1549
    [<0000000010a3396e>] do_new_mount fs/namespace.c:2881 [inline]
    [<0000000010a3396e>] path_mount+0x139a/0x2080 fs/namespace.c:3211
    [<000000002573613a>] do_mount fs/namespace.c:3224 [inline]
    [<000000002573613a>] __do_sys_mount fs/namespace.c:3432 [inline]
    [<000000002573613a>] __se_sys_mount fs/namespace.c:3409 [inline]
    [<000000002573613a>] __x64_sys_mount+0x27e/0x300 fs/namespace.c:3409
    [<0000000067fa539e>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
    [<00000000f900cc54>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: leak checking failed