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SubjectRe: ia64 hang/mca running gdb 'make check'
On Wed, Jul 21, 2010 at 10:51:36AM +0900, KAMEZAWA Hiroyuki wrote:
> 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) ?


dannf@krebs:~$ grep empty_zero_page /boot/System.map-2.6.32-5-mckinley
a0000001008784c0 d __ksymtab_empty_zero_page
a000000100882688 d __kcrctab_empty_zero_page
a000000100884ca4 r __kstrtab_empty_zero_page
a000000100974000 D empty_zero_page


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