I recently installed GNURadio on two laptops (installation via PYBOMBs) and everything has been running fine for a few weeks; but I'm suddenly running into issues with QT GUI on one of the laptops. I wasn't sure what the issue was originally, but after narrowing it down I'm able to see the problem with a simple flow graph:
signal source -> throttle -> QT GUI Sink
Starting with a blank slate in GRC and building the flow graph works fine on one device; but the same flow graph on the second laptop opens and closes immediately with return code -11. If I run the python code outside of GRC, I get the segmentation fault.
I was looking for a solution and I came across bug 645 (http://gnuradio.org/redmine/issues/645
) that was resolved in 3.7.3, but these laptops have 3.7.6 (git-133-gd814810) installed.
I noticed that the bug report mentions the avx volk kernel as the issue and both of my machines indicate that they're using volk machine avx_64_mmx. I also ran volk_profile and changed "volk_32fc_32f_multiply_32fc a_avx generic" to "volk_32fc_32f_multiply_32fc generic generic" as indicated in the bug report, but I still see the problem.
To be honest, I don't really know how the volk library works and I'm not sure what else I should try changing. If anybody has suggestions, it would be greatly appreciated.