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SubjectRe: ia64 hang/mca running gdb 'make check'
On Tue, 20 Jul 2010 11:35:12 -0600
dann frazier <dannf@debian.org> wrote:

> Debian's ia64 autobuilders have been experiencing system crashes while
> trying to run the gdb test suite:
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=588574
>
> I was able to reproduce this w/ the latest git tree, and bisected it
> down to this commit, introduced in 2.6.32:
>
> commit 62eede62dafb4a6633eae7ffbeb34c60dba5e7b1
> Author: Hugh Dickins <hugh.dickins@tiscali.co.uk>
> Date: Mon Sep 21 17:03:34 2009 -0700
>
> mm: ZERO_PAGE without PTE_SPECIAL
>
> Reinstate anonymous use of ZERO_PAGE to all architectures, not just to
> those which __HAVE_ARCH_PTE_SPECIAL: as suggested by Nick Piggin.
>
> Contrary to how I'd imagined it, there's nothing ugly about this, just a
> zero_pfn test built into one or another block of vm_normal_page().
>
> But the MIPS ZERO_PAGE-of-many-colours case demands is_zero_pfn() and
> my_zero_pfn() inlines. Reinstate its mremap move_pte() shuffling of
> ZERO_PAGEs we did from 2.6.17 to 2.6.19? Not unless someone shouts for
> that: it would have to take vm_flags to weed out some cases.
>
> fyi, I found this to not be reproducible on SLES11 SP1 (which is
> 2.6.32-based). I compared the .configs and found that the relevant
> difference is the PAGE_SIZE. It does not fail w/ 64KB pages, but
> reliably fails w/ 16KB pages.
>

Sorry, I have no idea...
Hmm, what is the address of empty_zero_page[] on your debian(16kb-page) ?

Thanks,
-Kame






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