Sam Baskinger created TS-3743:
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Summary: Crash Under Heavy Load and Sending Plugin Error Page
Key: TS-3743
URL: https://issues.apache.org/jira/browse/TS-3743
Project: Traffic Server
Issue Type: Bug
Components: Core
Reporter: Sam Baskinger
One of the tests done on the IronBee plugin for TrafficServer is to send a
OWASP Zap scan through the proxy at a DokuWiki server. When this was done a
repeatable but seemingly sporadic crash was observed when IronBee would request
that a block page be delivered to the client.
The crash was always in {{HttpTunnel::producer_run (this=this@entry=0xaf6021c8,
p=p@entry=0xaf6022f8)}} and in all cases {{c->vc}} was invalid.
Our investigations correlated the crash with HttpSM's {{ua_session->m_active}}
being false. More specifically we think that
{{Http::SM::setup_internal_transfer()}} starts with {{ua_session->m_active}} as
true and then closes it when it reaches the call to {{tunnel.tunnel_run(p)}}.
Please refer to two attachments. The first is a copy of the stack trace we've
been working off of. Every crash has a remarkably similar call stack. The
second attachment is a patch that is working in our labs.
This also appears in the TrafficServer 4.x series, and the same patch fixes our
problems.
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