we build nginx with ipp zlib, when we hot-restart or reload nginx, some old workers would stucked and not quit, it seems that worker had fallen into infinite loop，the back trace of this process show it was running near the ipp, so may be it is a bug of ipp.
by the way, if this is a bug of ipp, do we have to buy a license to get the latest version without this bug?
thanks
back trace:
top command:
