BUG: memory leak
unreferenced object 0xffff88800d002280 (size 16):
  comm "syz-executor.7", pid 6324, jiffies 4295201293 (age 16.841s)
  hex dump (first 16 bytes):
    f8 d9 40 44 80 88 ff ff 00 80 87 44 80 88 ff ff  ..@D.......D....
  backtrace:
    [<00000000ef141da6>] kmalloc include/linux/slab.h:552 [inline]
    [<00000000ef141da6>] ext4_multi_mount_protect+0x861/0xb20 fs/ext4/mmp.c:367
    [<0000000094f05260>] ext4_fill_super+0xa20e/0xcf20 fs/ext4/super.c:4774
    [<0000000062a5860b>] mount_bdev+0x331/0x3f0 fs/super.c:1419
    [<00000000cab7c340>] legacy_get_tree+0x105/0x220 fs/fs_context.c:592
    [<00000000aea669f4>] vfs_get_tree+0x8e/0x2f0 fs/super.c:1549
    [<0000000003784f2b>] do_new_mount fs/namespace.c:2881 [inline]
    [<0000000003784f2b>] path_mount+0x139a/0x2080 fs/namespace.c:3211
    [<0000000023818234>] do_mount fs/namespace.c:3224 [inline]
    [<0000000023818234>] __do_sys_mount fs/namespace.c:3432 [inline]
    [<0000000023818234>] __se_sys_mount fs/namespace.c:3409 [inline]
    [<0000000023818234>] __x64_sys_mount+0x27e/0x300 fs/namespace.c:3409
    [<0000000030db27f9>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
    [<00000000e4295e37>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: leak checking failed