BUG: memory leak
unreferenced object 0xffff888045097720 (size 16):
  comm "syz-executor.7", pid 430, jiffies 4296825211 (age 70.538s)
  hex dump (first 16 bytes):
    70 95 af 4c 80 88 ff ff 00 20 5f 45 80 88 ff ff  p..L..... _E....
  backtrace:
    [<00000000ecbf7a81>] kmalloc include/linux/slab.h:552 [inline]
    [<00000000ecbf7a81>] ext4_multi_mount_protect+0x861/0xb20 fs/ext4/mmp.c:367
    [<00000000ec627a43>] ext4_fill_super+0xa20e/0xcf20 fs/ext4/super.c:4774
    [<00000000b0fdc078>] mount_bdev+0x331/0x3f0 fs/super.c:1419
    [<00000000c52047cd>] legacy_get_tree+0x105/0x220 fs/fs_context.c:592
    [<000000009c2cc927>] vfs_get_tree+0x8e/0x2f0 fs/super.c:1549
    [<000000005468b39b>] do_new_mount fs/namespace.c:2881 [inline]
    [<000000005468b39b>] path_mount+0x139a/0x2080 fs/namespace.c:3211
    [<00000000ed22c9e4>] do_mount fs/namespace.c:3224 [inline]
    [<00000000ed22c9e4>] __do_sys_mount fs/namespace.c:3432 [inline]
    [<00000000ed22c9e4>] __se_sys_mount fs/namespace.c:3409 [inline]
    [<00000000ed22c9e4>] __x64_sys_mount+0x27e/0x300 fs/namespace.c:3409
    [<000000003ad9fb69>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
    [<0000000008e4a70c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: leak checking failed