Hello, In ngx_http_upstream_send_response() function there are a lot of checks for r->cache pointer validity. But it is absent for if (u->cacheable){}, which starts with dereferencing valid = r->cache->valid_sec; straight away.
If this considered to be an issue - patch attempting to fix it is attached. -- Best wishes, Andrey
0001-Add-missing-check-for-r-cache-pointer-validity-in-ng.patch
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