[GitHub] [trafficserver] zhang15535135608 commented on issue #4328: Segmentation fault in ShowCache::handleCacheEvent because cache_vc->first_buf is NULL

[GitHub]

recurrent question：

create big file 1.html, cache 1.html, modify  os file 1.html,  update cache 
1.html (os response 200).

In the process, using http_ui lookup_url 1.html (ensure open_read while in 
update write)


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https://github.com/apache/trafficserver/issues/4328 ]
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