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Bug#561203: threads and fork on machine with VIPT-WB cache


On penktadienis 04 Birželis 2010 08:21:06 dann frazier wrote:
> > My case and my analysis talked about UP kernel, and John David Anglin
> > 
> > made a patch:
> > 	http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=561203#144
> > 
> > After that, the discussion went to SMP cases.
> > 
> > It would be better to evaluate the patch again, and make sure it works
> > for UP case and fix failures of buildd, then apply for Linux in Debian
> > (only) for HPPA.
> > 
> > I know that the patch is not that ideal because it touches
> > architecture independent part of Linux, but it is worth for Linux in
> > Debian (or Linux for the HPPA machine of buildd, at least).
> I'm happy to test the patch if necessary to help push this change
> upstream. However, we do need the change to go upstream before we can
> include it in the Debian kernel.

I made a hackish patch for QProcess in Qt (usleep(1000) before fork()) which 
seems to reduce likelihood of the failure to very rare again. Once a new 
revision of qt4-x11 is uploaded to sid (soon I believe), KDE applications 
should be able to build again (hopefully).

Obviously it would be better to get this bug fixed for real but at least now 
the whole KDE stack won't be held by it while we wait.

Modestas Vainius <modestas@vainius.eu>

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