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@xxxxxxxxxxxxx>
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.
--
To unsubscribe from this list: send the line "unsubscribe linux-ia64" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
|