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Bug 64709 - After upgrade from 7.2 segfaults for non-root access
After upgrade from 7.2 segfaults for non-root access
Product: Red Hat Linux
Classification: Retired
Component: usermode (Show other bugs)
i686 Linux
medium Severity medium
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Assigned To: Nalin Dahyabhai
Brock Organ
Depends On:
  Show dependency treegraph
Reported: 2002-05-09 16:32 EDT by udippel
Modified: 2007-04-18 12:42 EDT (History)
0 users

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2002-05-22 00:22:19 EDT
Type: ---
Regression: ---
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Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description udippel 2002-05-09 16:32:20 EDT
From Bugzilla Helper:
User-Agent: Mozilla/5.0 Galeon/1.2.0 (X11; Linux i686; U;) Gecko/20020408

Description of problem:
Almost all programs needing root authentication segfault when started from
non-privileged user.
In 7.2 those programs asked for the root password when run; in 7.3 they segfault:

$ firewall-config
Segmentation fault
$ gdmconfig
Segmentation fault
$ redhat-config-users
Segmentation fault
$ serviceconf
Segmentation fault

They run well, when started from root, though

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
(see above)	

Expected Results:  The root password should be asked; no segfault

Additional info:
Comment 1 Nalin Dahyabhai 2002-05-09 17:29:50 EDT
What is the output of "rpm -qV usermode usermode-gtk pam glibc serviceconf"? 
I'm not seeing this on my system....
Comment 2 udippel 2002-05-10 05:40:40 EDT
# rpm -qV usermode usermode-gtk pam glibc serviceconf 
Comment 3 udippel 2002-05-10 05:44:46 EDT
# rpm -qV usermode usermode-gtk pam glibc serviceconf 
Comment 4 udippel 2002-05-10 05:44:59 EDT
# rpm -qV usermode usermode-gtk pam glibc serviceconf 
Comment 5 Nalin Dahyabhai 2002-05-10 10:57:48 EDT
What are the contents of /etc/sysconfig/i18n?  What is the output of "id -a"
when run as this user?
Comment 6 udippel 2002-05-10 12:31:53 EDT
$ cat /etc/sysconfig/i18n 

$ id -a
uid=500(udippel) gid=500(udippel) groups=500(udippel)
Comment 7 Nalin Dahyabhai 2002-05-10 15:40:28 EDT
Looks fine from here -- those don't appear to cause any strange behavior here. 
Does it still segfault if you run "ulimit -c unlimited; /usr/sbin/userhelper -t
-w serviceconf"?  If so, can you obtain a backtrace by becoming root, starting
"gdb /usr/sbin/userhelper core", and giving it the "bt" command?
Comment 8 udippel 2002-05-10 16:11:02 EDT
ulimit -c unlimited; /usr/sbin/userhelper -t -w serviceconf
ends up in working nicely here!! (no segfault)
What now?
Comment 9 Nalin Dahyabhai 2002-05-13 13:36:03 EDT
Try removing usermode-gtk, then launching serviceconf from a terminal window. 
If that succeeds, re-install the usermode-gtk package, copy
/usr/bin/consolehelper to /tmp/serviceconf, and try running /tmp/serviceconf
under a debugger:
gdb /tmp/serviceconf
If you still get a segmentation fault, you should be ablt to obtain a backtrace
by using the "bt" command.
Comment 10 udippel 2002-05-19 12:32:58 EDT
Try removing usermode-gtk => done
launching serviceconf from a terminal window => succeeds
If that succeeds [...] try running /tmp/serviceconf under a debugger:
gdb /tmp/serviceconf
run => result:
"Starting program: /tmp/serviceconf 
(no debugging symbols found)...(no debugging symbols found)...(no debugging
symbols found)...
Program received signal SIGTRAP, Trace/breakpoint trap.
0x40000b50 in _start () from /lib/ld-linux.so.2

Though I definitively have no clue what I'm doing here, I hope it helps!
Comment 11 Nalin Dahyabhai 2002-05-20 16:23:34 EDT
Darn.  The binaries are stripped of debugging information.  Please install the
latest builds (where /usr/bin/consolehelper isn't stripped) from
http://people.redhat.com/nalin/test/, and see if the debugger gives you a good

If you get a SIGTRAP in the debugger, tell it to continue with the "c" command
until you get a SIGSEGV, which will be the point where it actually crashes.  A
backtrace at that point should pinpoint the location where it fails.
Comment 12 udippel 2002-05-21 10:36:53 EDT
Program received signal SIGSEGV, Segmentation fault.
0x4033efbc in gdk_window_get_geometry () from /usr/X11R6/lib/libXft.so.1
(gdb) c

Is this better??
Comment 13 udippel 2002-05-21 10:39:44 EDT
Forgot the bt. Here's the whole set:

Program received signal SIGSEGV, Segmentation fault.
0x4033efbc in gdk_window_get_geometry () from /usr/X11R6/lib/libXft.so.1
(gdb) bt
#0  0x4033efbc in gdk_window_get_geometry () from /usr/X11R6/lib/libXft.so.1
#1  0x405f149a in ?? ()
#2  0x405f214d in ?? ()
#3  0x405ddd2d in ?? ()
#4  0x40016f91 in real_gdk_init_check () from /usr/lib/libgdkxft.so.0
#5  0x40016038 in gdk_init_check () from /usr/lib/libgdkxft.so.0
#6  0x400fad06 in gtk_init_check () from /usr/lib/libgtk-1.2.so.0
#7  0x08049cbf in ?? ()
#8  0x42017499 in __libc_start_main () from /lib/i686/libc.so.6
Comment 14 Nalin Dahyabhai 2002-05-21 12:42:11 EDT
This is very confusing.  The consolehelper binary isn't even linked with
libgtk-1.2 -- it's a GTK2 program, so it's linked with libgtk-x11-2.0.
Please verify this by running 'ldd /usr/bin/consolehelper-gtk | grep gtk' and
verifying that the gtk2 package is installed correctly by running 'rpm -V gtk2

Because the segfault appears to be occurring when consolehelper-gtk attempts to
connect to the X display, could you list the contents of the $DISPLAY
environment variable?  If it's ":0.0" or something similar, please also run
"ls -l /tmp/.X11-unix" to verify that there aren't any strange problems with the
permissions on the listening socket.
Comment 15 Nalin Dahyabhai 2002-05-21 13:02:18 EDT
Are you using the GdkXft hack?  If so, please remove it.
Comment 16 udippel 2002-05-22 00:22:13 EDT
Oh yes, you caught me on that one. Honestly, I didn't think of it! and only
remembered when you asked. So, how to downgrade to 7.2, because with 7.2 this
one was fine and especially increased the quality of the display for me; and it
is even legal where I live!

I didn't get your previous comment fully: should I still go on or do we close
the whole matter by stating that the nice GdkXft hack does not work together
with 7.3 ??
Comment 17 Nalin Dahyabhai 2002-05-22 10:12:57 EDT
My understanding of GdkXft is that it causes the GTK 1.2 libraries to be loaded.
 Because it contains many symbols with the same names as those included in GTK 2
(such as gdk_window_get_geometry) but which have changed in a
binary-incompatible way, you get a mixture of symbols from one version or the
other, which causes programs to crash.

GTK2 itself already provides anti-aliased fonts if you set the environment
variable GDK_USE_XFT to "1" (in your .bashrc or .cshrc), so such a hack is
unnecessary with newer programs.

If you must keep GdkXft installed, you can also downgrade the usermode package
to the version included with RHL 7.2, though as various other programs get
ported to GTK2 (as usermode was for RHL 7.3), you'll continue to see crashes
like this.

I'm going to mark this bug as resolved and tag it as WONTFIX because renaming
symbols in either library is not something we can do without breaking
compatibility with applications already built against that library.

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