Re: 32-bit segfaults on x86_64 in recent mm kernels

From: Rafael J. Wysocki (rjw_at_sisk.pl)
Date: 11/07/04

  • Next message: Karsten Wiese: "Re: [patch] Real-Time Preemption, -RT-2.6.10-rc1-mm3-V0.7.18" 
    To: linux-kernel@vger.kernel.org
Date:	Sun, 7 Nov 2004 22:53:34 +0100

    On Sunday 07 of November 2004 21:36, Andy Lutomirski wrote:
    > I've had segfaults in 32-bit emulation in recent (and not-so-recent) -mm
    > kernels on x86_64.
    >
    > 2.6.7-gentoo-r11 and 2.6.10-rc1 both work fine (even wine works for the
    > most part).
    >
    > 2.6.9-rc3-mm3 can't run wine -- it always segfaults. Other apps seem OK.
    [-- snip --]

    This is because of the flex mmap patch for x86-64. You can try the following
    workaround from Andi Kleen:

    diff -u linux-2.6.10rc1-mm3/kernel/sysctl.c-o
    linux-2.6.10rc1-mm3/kernel/sysctl.c
    --- linux-2.6.10rc1-mm3/kernel/sysctl.c-o 2004-11-05 11:42:00.000000000 +0100
    +++ linux-2.6.10rc1-mm3/kernel/sysctl.c 2004-11-06 13:50:22.000000000 +0100
    @@ -147,7 +147,7 @@
     #endif
     
     #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
    -int sysctl_legacy_va_layout;
    +int sysctl_legacy_va_layout = 1;
     #endif
     
     /* /proc declarations: */

    Greets,
    RJW 

    -- 
- Would you tell me, please, which way I ought to go from here?
- That depends a good deal on where you want to get to.
		-- Lewis Carroll "Alice's Adventures in Wonderland"
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