I have been playing around a bit with KataGo and repeatedly run into trouble when trying to increase the "numSearchThreads" (or trying the benchmark). I am running an up-to-date arch linux and compiled katago from source (v.1.3.5) as described in the readme. I am using a AMD Radeon RX 580 GPU and a AMD Ryzen 7 1700 CPU. The issue seems to be independent of the net (tried with current g170 extended nets b10, b15, and b20) and board size.

I attached the full gdb output with a backtrace.
gdboutput.txt

If you need more information or I can help resolving this issue, please let me know. Thanks for your effort!