Messages in this thread | | | Date | Tue, 20 Jul 2010 11:35:12 -0600 | From | dann frazier <> | Subject | ia64 hang/mca running gdb 'make check' |
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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.
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