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https://issues.apache.org/jira/browse/TS-4717?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Susan Hinrichs reassigned TS-4717:
----------------------------------
Assignee: Susan Hinrichs
> Http2 stack explosion
> ---------------------
>
> Key: TS-4717
> URL: https://issues.apache.org/jira/browse/TS-4717
> Project: Traffic Server
> Issue Type: Bug
> Components: HTTP/2
> Reporter: Susan Hinrichs
> Assignee: Susan Hinrichs
>
> We see this periodically with high traffic loads. ATS crashes with 7000+
> frames on the stack. The bulk of the frames are the following frame
> sequence.
> {code}
> #117 0x00000000005159c8 in Continuation::handleEvent (this=0x2b0bdd101b90,
> event=100, data=0x2b0bad0c7cf0)
> at ../iocore/eventsystem/I_Continuation.h:150
> #118 0x000000000064c05d in Http2ClientSession::state_start_frame_read
> (this=0x2b0bdd101b90, event=100, edata=0x2b0bad0c7cf0)
> at Http2ClientSession.cc:451
> #119 0x000000000064b0af in Http2ClientSession::main_event_handler
> (this=0x2b0bdd101b90, event=100, edata=0x2b0bad0c7cf0) at
> Http2ClientSession.cc:292
> #120 0x00000000005159c8 in Continuation::handleEvent (this=0x2b0bdd101b90,
> event=100, data=0x2b0bad0c7cf0)
> at ../iocore/eventsystem/I_Continuation.h:150
> #121 0x000000000064c386 in Http2ClientSession::state_complete_frame_read
> (this=0x2b0bdd101b90, event=100, edata=0x2b0bad0c7cf0)
> at Http2ClientSession.cc:483
> #122 0x000000000064b0af in Http2ClientSession::main_event_handler
> (this=0x2b0bdd101b90, event=100, edata=0x2b0bad0c7cf0) at
> Http2ClientSession.cc:292
> #123 0x00000000005159c8 in Continuation::handleEvent (this=0x2b0bdd101b90,
> event=100, data=0x2b0bad0c7cf0)
> at ../iocore/eventsystem/I_Continuation.h:150
> #124 0x000000000064c05d in Http2ClientSession::state_start_frame_read
> (this=0x2b0bdd101b90, event=100, edata=0x2b0bad0c7cf0)
> at Http2ClientSession.cc:451
> {code}
> We had cherry picked in the fix for TS-4209 to correctly enforce the
> concurrent stream limit. But in the latest crash of this type, it looks like
> we are pulling small items from cache, so the stream lives and dies on the
> stack. The concurrent active connection count never reaches the limit.
> I am going to try to change the
> state_state_start_frame_read/state_complete_frame_read logic from recursing
> handlers to a loop.
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