segfault when both use builtin and shared in ssl_session_cache

[DeJiang Zhu]

Hi, Nginx developers:

 I'm investigating a segfault issue: it happens when both "builtin" and
"shared" cache types are used in ssl_session_cache and it disappear when
only use "shared".

It's original reported here:
https://github.com/kubernetes/ingress-nginx/issues/7080#issuecomment-932293028
And some more details here:
https://github.com/openssl/openssl/issues/16733#issue-1014329932

I haven't see any code on Nginx side that will directly manipulate the
session hash hash.
Could you please provide any suggestions? Thanks very much!
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