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

["Rafael J. Wysocki" <rjw@sisk.pl>]

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

-- 
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