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

# Breaks unrelated applications
tags 561203 critical


On trečiadienis 02 Birželis 2010 20:56:17 dann frazier wrote:
> On Wed, Jun 02, 2010 at 01:16:01PM -0400, John David Anglin wrote:
> > On Wed, 02 Jun 2010, Modestas Vainius wrote:
> > > Hello,
> > > 
> > > this bug [1] is back to the "very common" department with eglibc 2.11
> > > (libc6- dev_2.11.1-1) builds. Majority of KDE applications are failing
> > > to build on hppa again. Is there really nothing what could be done to
> > > fix it?
> > 
> > I will just say it is very tricky.  I think a fix is possible (arm and
> > mips had similar cache problems) but the victim replacement present in
> > PA8800/PA8900 caches makes the problem especially difficult  for
> > hardware using these processors.
> > 
> > I have spent the last few months testing various alternatives and have
> > now done hundreds of kernel builds.  I did post some experimental patches
> > that fix the problem on UP kernels.  However, the problem is not resolved
> > for SMP kernels.
> Note that Debian's buildds run a UP kernel, so as soon as those fixes
> go upstream we can pull them in. Thanks for all your work here!

Well, as long as this is unfixed or at least "common", I don't see how hppa 
can be considered to be a release arch. Is that UP patch available somewhere?

All KDE applications have been stuck in unstable before due to this and 
history is about to repeat itself unless something is done. While apparently a 
failing test in eglibc can be ignored, other applications have to suffer real 
world problems...

Modestas Vainius <modestas@vainius.eu>

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