Re: 2.6.38-rc3 regression on parisc: segfaults

[John David Anglin]

> 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.

Dave
-- 
J. David Anglin                                  dave.anglin@xxxxxxxxxxxxxx
National Research Council of Canada              (613) 990-0752 (FAX: 952-6602)
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