OCF metadata updater is handling all the requests at once and when
it finishes the cache can deinitialize, so in the rare circumstances
when the thread is not aware of cache not existing any more, there
is another metadata kick request and check for the random pointer
is performed instead of expected cache.
The solution is to increase/decrease cache ref count prior sending
a message to a thread and after metadata has been updated.
Fixes#1533
Signed-off-by: Rafal Stefanowski <rafal.stefanowski@intel.com>
Change-Id: I77d2ae400110fcb4d491350e5fec334245f4bb90
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/5030
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
ebd8ef4bc5