BUG: memory leak
unreferenced object 0xffff8880144127c0 (size 16):
  comm "syz-executor.6", pid 25336, jiffies 4296336199 (age 17.833s)
  hex dump (first 16 bytes):
    88 24 f5 47 80 88 ff ff 00 c0 15 50 80 88 ff ff  .$.G.......P....
  backtrace:
    [<00000000d2ccaa1b>] kmalloc include/linux/slab.h:552 [inline]
    [<00000000d2ccaa1b>] ext4_multi_mount_protect+0x861/0xb20 fs/ext4/mmp.c:367
    [<00000000be950b0b>] ext4_fill_super+0xa20e/0xcf20 fs/ext4/super.c:4774
    [<00000000587030fa>] mount_bdev+0x331/0x3f0 fs/super.c:1419
    [<000000009d545a70>] legacy_get_tree+0x105/0x220 fs/fs_context.c:592
    [<00000000458dfef7>] vfs_get_tree+0x8e/0x2f0 fs/super.c:1549
    [<00000000ee3d94cc>] do_new_mount fs/namespace.c:2881 [inline]
    [<00000000ee3d94cc>] path_mount+0x139a/0x2080 fs/namespace.c:3211
    [<000000003a542c38>] do_mount fs/namespace.c:3224 [inline]
    [<000000003a542c38>] __do_sys_mount fs/namespace.c:3432 [inline]
    [<000000003a542c38>] __se_sys_mount fs/namespace.c:3409 [inline]
    [<000000003a542c38>] __x64_sys_mount+0x27e/0x300 fs/namespace.c:3409
    [<000000003fd5958e>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
    [<00000000982fac6e>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: leak checking failed