Debugging an issue with PRBVolpath on Windows

[Microno95]

I'm running a custom build of mitsuba 3 (feature/emissive-media) and while running the volume_optimization.ipynb test through pytest, I get the error: drjit.cuda.ad.UInt.__richcmp__(): Could not promote type 'int' to 'drjit.cuda.ad.UInt'.

While I understand that this may be an issue with the custom build, I wanted to get an idea of how best I could debug the problem as I have no idea why such an operation would fail.

[wjakob]

Sorry about the slow response time. My suggestion: Copy the whole notebook content into a Python file. Then, on a machine with Linux/GDB, install the GDB<->Python integration. Following this, you can put a breakpoint on jitc_raise which will stop the program when the exception is raised. At this point, you can use "bt" to get a C++ backtrace, and "py-bt" to get a Python backtrace. That at least tells you what led up to this exception being raised.

[Microno95]

Okiedokie! I'll give that a go and get back 👍