[Bug] PopenPool Worker Memory Leak Issue in Building

[zxybazh]

According to recent PRs #11094 #11074 , we found that multiple teams independently identified the same memory leak problem using PopenPool worker for tvm building during tuning.

Now the common workaround seems to be restarting the worker / Popen process pool after certain time of usage.
This issue is thus created to further investigate and track the root cause.

CC: @tqchen @junrushao1994 @shingjan @AndrewZhaoLuo @petersalas

[zxybazh]

Won't fix for now. Please feel free to reopen if this reproduces.