Re: pcp updates: libpcp connection unsharing

"Frank Ch. Eigler" <[email protected]>
Newsgroups gmane.comp.sysutils.pcp
Message-ID <[email protected]>
Hi -


> > > We need to properly understand the root cause of the problem;
> > 
> > Absolutely.  And until this problem is diagnosed (who's going to work
> > on it?),
> 
> Not you?  I'll look at it eventually [...]

We formally reported the present problem (github #118) over a month
ago and a possibly related one (now github #156) years ago.


> Have you written any test code so far to isolate and attempt to
> reproduce the problem outside of pmwebd?  [...]

The problem has already been reported outside pmwebd.  I have no
instrumentation ready to induce the failure(s) mechanically.  If
I did, the problem would be solved already.


> doing that would be quite helpful & would form the basis of those QA
> tests Mark mentioned.

Mark was talking about QA for the cross-version compatibility
checking.  It was not this stuff, which I agree would be useful.


> [...]  As to the valgrind threading reports, same thing - we need to
> see specific issues being resolved there and explain how, why, etc.

I have tried to explain lock ordering bugs with various levels of
specificity several times on the list.  Would it help if I walk
through some random individual bug with small steps?


> They could well be simple things that are easily fixed (if PMAPI
> threaded tools eventuate) or non-issues in practice - who knows?
> Not us, not yet.

I have reported & analyzed actual observed deadlocks on the list
months ago.  Deeming them non-issues would guarantee that PMAPI
threaded tools disappear rather than eventuate.


- FChE

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