Jan 17, 2015 - 03:52am
I am using Linux Mint 17.1 (based on Ubuntu 14.04, kernel 3.13.0-37-generic), 64-bit Cinnamon edition.
I have installed the Intel graphics driver via the 1.0.7 installer.
I am using the railway layout design application XtrkCad, version 4.0.2, which I installed from the repositories (this is the latest non-beta version). It always worked great, until some time ago. When I open a track layout I created earlier the X server crashes and I am returned to the login screen. The Xorg log shows a segmentation fault.
Sometimes this does not happen when opening the track layout file, but when resizing the XtrkCad window.
When doing the same in a VirtualBox virtual machine, with the same versions of Linux Mint and XtrkCad, everything runs fine. Main difference: the virtual machine uses the VirtualBox video driver instead of the Intel driver on the physical system.
The physical system has an Asus Vanguard B85 motherboard, with a Core i7-4770S. I am using the integrated graphics controller.
So far I have not been able to uninstall the Intel graphics driver, to see if that solves the problem.
How can I uninstall the Intel graphics driver (and keep a functional system ;-) so I can try an older version or a generic driver?
Here is the error message in Xorg.log:
[ 9812.958] (EE) Backtrace:
[ 9812.959] (EE) 0: /usr/bin/X (xorg_backtrace+0x48) [0x7fb788a91798]
[ 9812.959] (EE) 1: /usr/bin/X (0x7fb7888e8000+0x1ad489) [0x7fb788a95489]
[ 9812.959] (EE) 2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7fb7879e5000+0x10340) [0x7fb7879f5340]
[ 9812.959] (EE) 3: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fb7821f8000+0xd9608) [0x7fb7822d1608]
[ 9812.959] (EE) 4: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fb7821f8000+0x2dfd0) [0x7fb782225fd0]
[ 9812.959] (EE) 5: /usr/bin/X (miZeroPolyArc+0xfd3) [0x7fb788a8cdc3]
[ 9812.959] (EE) 6: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fb7821f8000+0x49123) [0x7fb782241123]
[ 9812.959] (EE) 7: /usr/bin/X (0x7fb7888e8000+0x1352da) [0x7fb788a1d2da]
[ 9812.959] (EE) 8: /usr/bin/X (0x7fb7888e8000+0x52710) [0x7fb78893a710]
[ 9812.959] (EE) 9: /usr/bin/X (0x7fb7888e8000+0x55c0e) [0x7fb78893dc0e]
[ 9812.959] (EE) 10: /usr/bin/X (0x7fb7888e8000+0x59a9a) [0x7fb788941a9a]
[ 9812.959] (EE) 11: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf5) [0x7fb786424ec5]
[ 9812.959] (EE) 12: /usr/bin/X (0x7fb7888e8000+0x44efe) [0x7fb78892cefe]
[ 9812.959] (EE)
[ 9812.959] (EE) Segmentation fault at address 0x7fff432ee004
[ 9812.959] (EE)
Fatal server error:
[ 9812.959] (EE) Caught signal 11 (Segmentation fault). Server aborting
Hi - any chance you could install the debug symbols package? it's probably xserver-xorg-video-intel-dbg.
Then trigger the backtrace again (or examine the core dump with gdb if you have core dumps enabled).
I installed the debug symbols. This is the resulting backtrace from Xorg.0.log.old:
[ 42.059] (EE) Backtrace:
[ 42.059] (EE) 0: /usr/bin/X (xorg_backtrace+0x48) [0x7fcb007d3798]
[ 42.059] (EE) 1: /usr/bin/X (0x7fcb0062a000+0x1ad489) [0x7fcb007d7489]
[ 42.059] (EE) 2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7fcaff727000+0x10340) [0x7fcaff737340]
[ 42.059] (EE) 3: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fcaf9f3a000+0xd9608) [0x7fcafa013608]
[ 42.059] (EE) 4: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fcaf9f3a000+0x2dfd0) [0x7fcaf9f67fd0]
[ 42.059] (EE) 5: /usr/bin/X (miZeroPolyArc+0xfd3) [0x7fcb007cedc3]
[ 42.059] (EE) 6: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fcaf9f3a000+0x49123) [0x7fcaf9f83123]
[ 42.060] (EE) 7: /usr/bin/X (0x7fcb0062a000+0x1352da) [0x7fcb0075f2da]
[ 42.060] (EE) 8: /usr/bin/X (0x7fcb0062a000+0x52710) [0x7fcb0067c710]
[ 42.060] (EE) 9: /usr/bin/X (0x7fcb0062a000+0x55c0e) [0x7fcb0067fc0e]
[ 42.060] (EE) 10: /usr/bin/X (0x7fcb0062a000+0x59a9a) [0x7fcb00683a9a]
[ 42.060] (EE) 11: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf5) [0x7fcafe166ec5]
[ 42.060] (EE) 12: /usr/bin/X (0x7fcb0062a000+0x44efe) [0x7fcb0066eefe]
[ 42.060] (EE)
[ 42.060] (EE) Segmentation fault at address 0x7fffd0ce7004
[ 42.060] (EE)
Fatal server error:
[ 42.060] (EE) Caught signal 11 (Segmentation fault). Server aborting
Installing the debug symbols didn't change the information in the backtrace.
Do you need other information?
There are probably some more debug packages - do you have a list of the
debug symbol packages you installed? xserver-xorg-core-dbg is also a possibility.
I added xserver-xorg-core-dbg. Besides xserver-xorg-video-intel-dbg these are the only installed packages with dbg or debug in their name.
I forgot to mention (and there doesn't seem to be an option to edit a message):
the output in Xorg.0.log.old is still the same.
Ok - even if the Xorg log has the same output it could be worth you
capturing the core dump and pointing gdb at it. It's pretty straightforward
to do - if you want some instructions let me know.
Where would I find the core dump (if one was made)?
I tried to run gdb /usr/bin/xtrkcad, but that resulted in the gdb saying ""/usr/bin/xtrkcad": not in executable format: File format not recognized".
So yes please, your instructions are welcome.
~$ ulimit -c unlimited
~$ sysctl -w kernel.core_pattern=/tmp/core.%p
Then when it dumps core file will be in /tmp/core.<PID>
Sounds like /usr/bin/xtrkcad might be a script, in which case you can have
a look inside and see how the real xtrcad is invoked (should you happen to be curious)
Once you have a core file:
~$ gdb /path/to/actual/binary /tmp/core.<PID>
> bt full
I tried your instructions, but no core dump seems to be created.
/usr/bin/xtrkcad is indeed a script. It sets an environment variable to /usr/lib/xtrkcad and then runs xtrkcad from that path.