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    SubjectRe: 2.6.38-rc3 regression on parisc: segfaults
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    > 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@nrc-cnrc.gc.ca
    National Research Council of Canada (613) 990-0752 (FAX: 952-6602)


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