Bug 23145 - dbus-daemon segfault as user with nvidia drivers
Summary: dbus-daemon segfault as user with nvidia drivers
Alias: None
Product: dbus
Classification: Unclassified
Component: core (show other bugs)
Version: 1.2.x
Hardware: x86 (IA32) Linux (All)
: high major
Assignee: Havoc Pennington
QA Contact: John (J5) Palmieri
Depends on:
Reported: 2009-08-05 01:29 UTC by Francesc Ortiz
Modified: 2009-08-05 07:51 UTC (History)
1 user (show)

See Also:
i915 platform:
i915 features:


Description Francesc Ortiz 2009-08-05 01:29:35 UTC
Suddently I cannot use dbus anymore as regular user id if use nvidia drivers, because dbus-daemon gives a segmentation fault.

in dmesg i get this:

dbus-daemon[25832]: segfault at 6ff325e0 ip b7ef930c sp bfd74a10 error 4 in libGL.so.185.18.31[b7ed2000+80000]

I couldn't find any clue of what can be wrong checking on the internet.

What surprises me more is that the segfault only appears as regular user.
Comment 1 Thiago Macieira 2009-08-05 04:04:11 UTC
dbus-daemon doesn't link to libGL, directly or indirectly.

How did you manage to cause libGL to crash dbus-daemon?
Comment 2 Francesc Ortiz 2009-08-05 06:33:00 UTC
I wish I knew. I use the standard dbus-core package in Arch Linux, no custom modifications.

This is the configure command it uses to compile:

./configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var \
  	      --libexecdir=/usr/lib/dbus-1.0 --with-dbus-user=81 \
              --with-system-pid-file=/var/run/dbus.pid \
	      --enable-inotify --disable-dnotify \
              --disable-verbose-mode --disable-static \
	      --disable-tests --disable-asserts --without-x
Comment 3 Thiago Macieira 2009-08-05 06:44:53 UTC
Sorry, please take this to Arch Linux. Either they have some modifications to D-Bus to make it link to libGL or they have system modifications to make it load that (LD_PRELOAD or /etc/ld.so.preload).

In any case, this is not a D-Bus bug.
Comment 4 Thiago Macieira 2009-08-05 06:48:18 UTC
This information may be of use: for security reasons, dbus-daemon is compiled with -fPIE and linked with -pie (Position Independent Executable).

However, the NVidia OpenGL libraries are *not* position independent. They have relocations in the .text section. That could be the reason why it crashes: maybe position-independent executables cannot link to position-dependent libraries.
Comment 5 Francesc Ortiz 2009-08-05 07:51:22 UTC
LD_PRELOAD was the cause. I had 'export LD_PRELOAD=/usr/lib/libGL.so.1' in my .bashrc to fix a bug when switching flash web content to fullscreen.

Thank you for your help.

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