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Bug 155790 - 32-bit apps crash on start up, but not if started by gdb
Summary: 32-bit apps crash on start up, but not if started by gdb
Keywords:
Status: CLOSED RAWHIDE
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel
Version: rawhide
Hardware: x86_64
OS: Linux
medium
high
Target Milestone: ---
Assignee: Roland McGrath
QA Contact: Brian Brock
URL:
Whiteboard:
: 156166 (view as bug list)
Depends On:
Blocks: FC4Blocker
TreeView+ depends on / blocked
 
Reported: 2005-04-23 02:56 UTC by Alexandre Oliva
Modified: 2007-11-30 22:11 UTC (History)
8 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2005-04-29 05:31:00 UTC
Type: ---

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Description Alexandre Oliva 2005-04-23 02:56:55 UTC 
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.7.7) Gecko/20050416 Fedora/1.0.3-2 Firefox/1.0.3

Description of problem:
Many (all?) 32-bit programs crash shortly after they start running on today's rawhide kernel.  Going back to 2.6.11-1.1253_FC4, they work fine again.  I couldn't figure out exactly what's wrong with them, because, if I start them from within GDB, they work fine.  strace reports only two syscalls: execve and brk(0), that returns a reasonable value and is followed by a segmentation fault.

Examples of programs that crash at start up are an ancient 32-bit build of gtimer I have, dag's openvpn and the glibc.i686's /usr/sbin/glibc_post_upgrade.i686, that crashed when I tried rpm -Uv --replacepkgs glibc-2.3.5-1.i686.rpm.

It was not related with prelinking, since I tried to prelink -u all of the relevant binaries, and it didn't make any difference within kernel 1258.  Going back to 1253, everything was functional again.

Version-Release number of selected component (if applicable):
kernel-2.6.11-1.1258_FC4

How reproducible:
Always

Steps to Reproduce:
1.Boot into 1258_FC4 for x86_64
2.Run 32-bit programs such as /usr/sbin/glibc_post_ugprade.i686
3.Boot inot 1253_FC4
4.Ditto

Actual Results:  The former crashes, the latter works

Expected Results:  Both should work

Additional info:
Comment 1 Brian Gerst 2005-04-23 20:57:38 UTC 
I think that exec-shield is conflicting with the recent changes to the 32-bit
VDSO in -rc3.  This problem does not occur in vanilla 2.6.13-rc3.

Apr 23 14:25:46 citadel kernel: wine[10626]: segfault at 00000000ffffe01c rip
000000004dffa575 rsp 00000000ffffd38c error 4
Comment 2 Roland McGrath 2005-04-26 09:06:17 UTC 
Well, work around it with sysctl -w kernel.vsyscall32=0 for the moment.
Comment 3 Michal Jaegermann 2005-04-27 15:32:28 UTC 
The catch for a workaround in comment #2 is that at least for 2.6.11-1.1261_FC4
'sysctl -w kernel.vsyscall32=0' comes back with "unknown key".  There is
'kernel.vsyscall64' but this is not that (which is not a surprise).
Comment 4 Roland McGrath 2005-04-28 20:04:05 UTC 
In fact it's abi.vsyscall32 that's the one I meant.
Comment 5 Dave Jones 2005-04-29 00:59:15 UTC 
*** Bug 156166 has been marked as a duplicate of this bug. ***
Comment 6 Roland McGrath 2005-04-29 05:31:00 UTC 
We have a fix for this (it was exec-shield changes running afoul of recent
upstream changes to the vdso stuff for 32-bit).  The next kernel build will have
the fix.
Comment 7 Brian Gerst 2005-04-29 17:00:11 UTC 
kernel-2.6.11-1.1276_FC4 fixes it for me.
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