kmemleak: sched_domain_shared leaked on asymmetric-capacity + SCHED_CACHE

[Breno Leitao]

Hi,

On current linux-next (CONFIG_SCHED_CACHE=y) we hit a kmemleak on an
arm64 box with asymmetric CPU capacity, triggered by a cpuset-driven
sched-domain rebuild:

kmemleak: unreferenced object 0xffff000100c95e80 (size 32):
  comm "kworker/22:1", pid 407, jiffies 4294669077
  hex dump (first 32 bytes):
    48 00 00 00 48 00 00 00 00 00 00 00 20 00 00 00  H...H....... ...
  backtrace (crc ec5d7053):
    __kmalloc_cache_node_noprof
    build_sched_domains
    partition_sched_domains
    rebuild_sched_domains_locked
    rebuild_sched_domains
    process_scheduled_works
    kthread
    ret_from_fork
  kmemleak: 1 new suspected memory leaks

The leaked object is a struct sched_domain_shared (32 bytes with
CONFIG_SCHED_CACHE) allocated in __sds_alloc(), inlined into
build_sched_domains()

Is this a known issue?

--breno