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Bug#223394: marked as done (libc6: NPTL causes segfaults on forking(?) apps with 2.6.0-test11 with exec_shield)

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From: Riku Voipio <riku.voipio@iki.fi>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: libc6: NPTL causes segfaults on forking(?) apps with 2.6.0-test11 with
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Package: libc6
Version: 2.3.2.ds1-10
Severity: normal

Testing vanilla 2.6.0-test11 and

I'm using bash and ls as an example, but the same symptoms
appear in wide range of apps: apt-get with apt-listchanges,
init+bootlogd, xterm+bash etc.

Without exec-shield:

# echo 0 > /proc/sys/kernel/exec-shield
# bash
$ ls
changelog.Debian.gz  copyright
$ exit

# echo 2 > /proc/sys/kernel/exec-shield
# bash
$ ls
changelog.Debian.gz  copyright
Segmentation fault   # <- this segfault happens in bash, not ls

Without NPTL

# echo 2 > /proc/sys/kernel/exec-shield
# LD_ASSUME_KERNEL=2.4.1 bash
$ ls
changelog.Debian.gz  copyright

Running gdb is kinda tricky,because it segfaults too.
By starting gdb before enabling exec-shield:

Program received signal SIGSEGV, Segmentation fault.
0x08076f5f in kill_pid ()
(gdb) bt
#0  0x08076f5f in kill_pid ()
#1  0x0806876a in execute_command_internal ()
#2  0x08068105 in execute_command ()
#3  0x0805cbb0 in reader_loop ()
#4  0x0805ac85 in main ()

execute_command_internal beats my c parsing skills, so I don't really
understand what is happening.

Same effects with and without libc6-i686. Cpu is Athlon XP stepping 2

-- System Information:
Debian Release: testing/unstable
Architecture: i386
Kernel: Linux kgb 2.6.0-test11 #1 Mon Dec 8 18:52:33 EET 2003 i686
Locale: LANG=C, LC_CTYPE=fi_FI@euro

Versions of packages libc6 depends on:
ii  libdb1-compat                 2.1.3-7    The Berkeley database routines [gl

-- no debconf information

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Date: Sat, 11 Dec 2004 18:28:36 +0200
From: Riku Voipio <riku.voipio@iki.fi>
To: 223394-done@bugs.debian.org
Subject: Re: Bug#223394: libc6: NPTL causes segfaults
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Using linux 2.6.9 and exec-shield-nx-2.6.9-A2 patch, there seems
to be no problems with nptl vs exec-shield. Now I just need xserver
fixed, but that's another story and package (#240809 and xfree)

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