https://issues.apache.org/bugzilla/show_bug.cgi?id=56645

--- Comment #6 from Eric Covener <[email protected]> ---
(In reply to Takashi Sato from comment #5)
> (In reply to Takashi Sato from comment #2)
> > (In reply to Eric Covener from comment #1)
> > > I notice there is no checking of the return code for lock/unlock of those
> > > mutexes. They could be failing
> > 
> > OK, I try to put trace logs to log whether lock/unlock success or not.
> 
> I tried. lock/unlock succeed...
> 
> Then, I tried to migrate apr_skiplist to apr_array, then works fine (of
> cource performance is bad and may have memory leaks)!
> It seems apr_skiplist has some bug.

You might try Yanns patch. I don't know anything about the skiplist impl, but I
don't know what might get moved while other threads add/remove unrelated
entries.  In that case, his lock would unfortunately be required.

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