SEGFAULTs when running most tools

[Peter Sabaini]

Binary package hint: util-vserver

vserver-info, chcontext and showattr (and others) are SEGFAULTing on me
# vserver-info - SYSINFO
zsh: segmentation fault (core dumped) vserver-info - SYSINFO

versions:
* util-vserver 0.30.212-1
* kernel 2.6.20 with vs2.3.0.10
* arch=x86_64

i've taken this up on irc://irc.oftc.net/vserver and according to the devs there gcc-4.1 is to blame because it doesn't honor the stack-protector disable flag

installing gcc-3.3 and recompiling fixed the problem

[Izak Burger (isburger)]

I can confirm this problem (vs 2.2.0) and kernel 2.6.19. It goes away if you use gcc-3.4, but it does not go away if you add -fno-stack-protector to CFLAGS.

[András Korn (kornandras)]

For what it's worth, binary packages from Debian work fine.

Just rebuilding the source on Ubuntu results in a broken package.

And yes, it is due to the stack-protector issue, we checked using gdb:

0x080485ca <processFile+4>: push %ebx
0x080485cb <processFile+5>: sub $0x64,%esp
0x080485ce <processFile+8>: mov %gs:0x14,%eax

It segfaults at the last line. I'm told this code is only generated with stack-protector enabled.

Compiling with gcc-4.0 also works, like this:

debian/rules binary CC='diet -Os gcc-4.0'

Andras

[rooijan (rrossouw)]

FYI more info on this ...
I have segmentation errors on one machine and not the other. Both running Ubuntu 7.04 server installs. Both custom kernels and tools make installed. No packages at this point.

Machine 1:
root@bermuda:~# aptitude show gcc-4.1 | grep Version
Version: 4.1.2-0ubuntu4
root@bermuda:~# uname -r
2.6.17.13-vs2.0.2.1
Production machine and runs two vservers fine.

Machine 2(segmentaion errors):
root@fiji1:/usr/src# aptitude show gcc-4.1 | grep Version
Version: 4.1.2-0ubuntu4
root@fiji1:/usr/src# uname -r
2.6.20.11-vs2.2.0
1. testme and testfs does not work with packages. If compiled then testme and testfs runs fine but vserver-info segfaults.
2. Machine 1 kernel on Machine 2 breaks the same way.

If anyone wants more info let me know.
-Riaan