A note about mod_shib2 and mod_http2

Jacob Lundberg jacob at collegenet.com
Thu Mar 8 17:26:55 EST 2018

Hi Scott,

On Thu, 2018-03-08 at 22:09 +0000, Cantor, Scott wrote:
> (And to be clear if you're saying those exact stack traces were from
> threads consuming CPU, that doesn't seem possible, they appeared to be
> waiting on a mutex, not performing a system call that would be chewing
> cycles.)

Yeasss...  Thanks, that was the nudge I needed.  I was testing to see if
the SP issue was resolved, so it hadn't occurred to me we had developed
a new problem with the httpd's HTTP/2 support since last time we tested.
However after correlating the high-load threads with their backtraces I
don't think it's in the SP.

>From a further reading of some of our internal communication (six months
is a long time ago) it seems the CPU load last time was probably related
to a known httpd issue which we patched.  Then we discovered the SP
problem, for which I am now back to thinking the existing patch works.

I'll keep chasing down this rat-hole and see if I catch anything
interesting but if you don't hear back from me, assume the xmltooling
patch does indeed work.



Jacob Lundberg
AVP, IT Architecture
503.290.0100 (voice)
503.973.5252 (fax)

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