TS-4916 Add safety net to avoid H2-infinite-loop deadlock. #1157
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Current Http2ConnectionState implementation uses a memory pool for instantiating streams and DLL<> stream_list for storing active streams. Destroying a stream before deleting it from stream_list and then creating a new one + reusing the same chunk from the memory pool right away always leads to destroying the DLL structure (deadlocks, inconsistencies). Added a safety net since the consequences are disastrous. Until the design/implementation changes it seems less error prone to (double) delete before destroying (noop if already deleted). (cherry picked from commit a6f9337) Conflicts: proxy/http2/Http2ConnectionState.cc
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PSUdaemon
approved these changes
Oct 27, 2016
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Current Http2ConnectionState implementation uses a memory pool for
instantiating streams and DLL<> stream_list for storing active streams.
Destroying a stream before deleting it from stream_list and then creating
a new one + reusing the same chunk from the memory pool right away always
leads to destroying the DLL structure (deadlocks, inconsistencies).
Added a safety net since the consequences are disastrous.
Until the design/implementation changes it seems less error prone
to (double) delete before destroying (noop if already deleted).
(cherry picked from commit a6f9337)
Conflicts:
proxy/http2/Http2ConnectionState.cc