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SubjectRe: 2.6.38-rc3 regression on parisc: segfaults
> I have been testing devel kernels on SMP L1000 successfully until 
> 2.6.38-rc2-00324-g70d1f36 included. The testing means booting the new
> kernel and running aptitude to update to current debian unstable.
> Now I tried 2.6.38-rc3 and got a crash from aptitude on 2 out of 2
> tries. Maybe aptitude was broken inbetween but it looks like a kernel
> bug. Retried 2.6.38-rc2-00324-g70d1f36 and that seemed to work fine so
> it's more likely a kernel problem.

If aptitude fails consistently, it should be possible to debug or
isolate to a particular kernel change. Usually, SMP segvs don't
provide much information as to the cause of the problem. strace
output and a gdb backtrace would be useful.

I have seen improved SMP stability building with GCC 4.5.3 (try a
recent snap). This fixes an asm/branch problem. It seems like James'
flush patch hasn't been pulled.

J. David Anglin
National Research Council of Canada (613) 990-0752 (FAX: 952-6602)

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