Github user jpeach commented on a diff in the pull request:
https://github.com/apache/trafficserver/pull/717#discussion_r68081721
--- Diff: proxy/http/Http1ClientSession.h ---
@@ -181,7 +189,12 @@ class Http1ClientSession : public ProxyClientSession
MIOBuffer *read_buffer;
IOBufferReader *sm_reader;
- C_Read_State read_state;
+
+ /*
+ * Volatile should not be necessary, but there appears to be a bug in
the 4.9 rhel gcc
+ * compiler that was using an old version of read_state to make
decisions in really_destroy
+ */
+ volatile C_Read_State read_state;
--- End diff --
If there are threaded dependencies on this, then we should force an atomic
read or a memory acquire/release. I think the volatile is too subtle to be
depended on.
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