BUG: memory leak
unreferenced object 0xffff88800ed7a120 (size 16):
  comm "syz-executor.3", pid 12236, jiffies 4296227843 (age 19.339s)
  hex dump (first 16 bytes):
    80 7e df 44 80 88 ff ff 00 20 bb 0c 80 88 ff ff  .~.D..... ......
  backtrace:
    [<00000000edcfe636>] kmalloc include/linux/slab.h:552 [inline]
    [<00000000edcfe636>] ext4_multi_mount_protect+0x861/0xb20 fs/ext4/mmp.c:367
    [<00000000c65b7a2b>] ext4_fill_super+0xa20e/0xcf20 fs/ext4/super.c:4774
    [<0000000083222bb6>] mount_bdev+0x331/0x3f0 fs/super.c:1419
    [<0000000095bf4936>] legacy_get_tree+0x105/0x220 fs/fs_context.c:592
    [<000000009b069d10>] vfs_get_tree+0x8e/0x2f0 fs/super.c:1549
    [<000000007f579d58>] do_new_mount fs/namespace.c:2881 [inline]
    [<000000007f579d58>] path_mount+0x139a/0x2080 fs/namespace.c:3211
    [<00000000bb2e8410>] do_mount fs/namespace.c:3224 [inline]
    [<00000000bb2e8410>] __do_sys_mount fs/namespace.c:3432 [inline]
    [<00000000bb2e8410>] __se_sys_mount fs/namespace.c:3409 [inline]
    [<00000000bb2e8410>] __x64_sys_mount+0x27e/0x300 fs/namespace.c:3409
    [<00000000437bf090>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
    [<000000003f70a30f>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: leak checking failed