Thank so much Paul, this works and performance is great!
From: FSL - FMRIB's Software Library <[log in to unmask]> On Behalf Of Paul McCarthy
Sent: Monday, October 23, 2023 9:50 AM
To: [log in to unmask]
Subject: Re: [FSL] FSLeyes doesn't start, "Segmentation fault"
Hi Tanja,
Can you try running this in a terminal:
unset LIBGL_ALWAYS_INDIRECT
export LIBGL_ALWAYS_SOFTWARE=1
And then try running glxgears and FSLeyes.
I'm guessing you're using the Wayland server that is built into WSL2. I have seen a few instances where attempting to use the graphics card results in segmentation faults, so in these instances software-based rendering is the only option. If this works, you can add the unset/export lines at the bottom of your ~/.bashrc file.
If the above doesn't work, or results in very poor performance in FSLeyes, another option is to try a different X server such as vcxsrv or mobaxterm.
Paul
________________________________
From: FSL - FMRIB's Software Library <[log in to unmask]<mailto:[log in to unmask]>> on behalf of Tatjana Schmidt <[log in to unmask]<mailto:[log in to unmask]>>
Sent: 20 October 2023 16:16
To: [log in to unmask]<mailto:[log in to unmask]> <[log in to unmask]<mailto:[log in to unmask]>>
Subject: Re: [FSL] FSLeyes doesn't start, "Segmentation fault"
Hi Paul,
Thank you for the ideas! I'm not sure about the Wayland server, when I run
"loginctl show-session $(loginctl | grep $(whoami) | awk '{print $1}') -p Type"
I get "Type=tty".
LIBGL_ALWAYS_INDIRECT or LIBGL_ALWAYS_SOFTWARE weren't in my bash profile in the first place, I tried adding
unset LIBGL_ALWAYS_INDIRECT
glxinfo
glxgears
and
export LIBGL_ALWAYS_INDIRECT=1
glxinfo
glxgears
but neither worked: For the first version, once I change bashrc I get a long output that starts with "name of display: :0" and ends with "Segmentation fault" (I attached the output here), and when I then run fsleyes I get the same segmentation fault error message I got initially. For the second version, after changing bashrc I get
name of display: :0
X Error of failed request: BadValue (integer parameter out of range for operation)
Major opcode of failed request: 148 (GLX)
Minor opcode of failed request: 24 (X_GLXCreateNewContext)
Value in failed request: 0x0
Serial number of failed request: 58
Current serial number in output stream: 59
Error: glXCreateContext failed
...and then once I run fsleyes I get
tanja@LAPTOP-PRVNU0UE:~$ fsleyes
WARNING idle.py 578: __idleLoop - Idle task create crashed - wxAssertionError: C++ assertion ""tempContext"" failed at /home/conda/feedstock_root/build_artifacts/wxpython_1689356204926/work/ext/wxWidgets/src/unix/glx11.cpp(498) in wxGLContext(): glXCreateContext failed
Traceback (most recent call last):
File "/home/tanja/fsl/lib/python3.11/site-packages/fsl/utils/idle.py", line 576, in __idleLoop
task.task(*task.args, **task.kwargs)
File "/home/tanja/fsl/lib/python3.11/site-packages/fsleyes/gl/__init__.py", line 742, in create
self.__createWXGLContext(requestVersion=requestVersion)
File "/home/tanja/fsl/lib/python3.11/site-packages/fsleyes/gl/__init__.py", line 975, in __createWXGLContext
ctx = wxgl.GLContext(self.__canvas, **candidate)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
wx._core.wxAssertionError: C++ assertion ""tempContext"" failed at /home/conda/feedstock_root/build_artifacts/wxpython_1689356204926/work/ext/wxWidgets/src/unix/glx11.cpp(498) in wxGLContext(): glXCreateContext failed
From: FSL - FMRIB's Software Library <[log in to unmask]<mailto:[log in to unmask]>> On Behalf Of Paul McCarthy
Sent: Friday, October 20, 2023 9:29 AM
To: [log in to unmask]<mailto:[log in to unmask]>
Subject: Re: [FSL] FSLeyes doesn't start, "Segmentation fault"
Hi Tanja,
What X/Wayland server are you using? Can you try different values for the LIBGL_ALWAYS_INDIRECT and LIBGL_ALWAYS_SOFTWARE variables? They should be in your ~/.bashrc file. You can find some more details in the FSLeyes documentation at https://open.win.ox.ac.uk/pages/fsl/fsleyes/fsleyes/userdoc/troubleshooting.html#ssh-x11-vnc-nomachine-etc-fsleyes-won-t-start
Paul
________________________________
From: FSL - FMRIB's Software Library <[log in to unmask]<mailto:[log in to unmask]>> on behalf of Tatjana Schmidt <[log in to unmask]<mailto:[log in to unmask]>>
Sent: 19 October 2023 10:31
To: [log in to unmask]<mailto:[log in to unmask]> <[log in to unmask]<mailto:[log in to unmask]>>
Subject: [FSL] FSLeyes doesn't start, "Segmentation fault"
Hi everyone,
I have a problem with opening FSLeyes, I'm using WSL2 and when I run "fsleyes" from the terminal it returns "/home/tanja/fsl/share/fsl/bin/fsleyes: line 2: 1353 Segmentation fault /home/tanja/fsl/bin/python3.11 -I /home/tanja/fsl/bin/fsleyes "$@"", the number after "line 2" is a different one every time and I can't figure out what is wrong. I've seen this issue being discussed here a while ago but I didn't quite understand how it was resolved in the end. Does anyone have an idea what I could try?
Thanks a lot!
Tanja
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