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This is a 64-bit issue. I have confirmed that the 32-bit version works properly. http://forum.zdoom.org/viewtopic.php?f=2&t=28245

I have disabled them accordingly.

I can reproduce with zandronum 1.x (based on r1551) and with 2.0 (based on r2509) ... it seems an error inside fmodex itself.

which version of fmodex are you using?

[edit]nvm, I can reproduce the crash pretty well in my linux x64 setup. My fmod version is 4.26.36. I'll give more info later.

Since... I don't even know. Setting sound interpolation to cubic or spline results in a crash. Haven't verified if this is x86_64-only.
From gdb all I can see is that it's a segmentation fault in libfmodex.so itself, in FMOD_Resampler_Cubic() and FMOD_Resampler_Spline(), respectively.

I don't experience this issue if I build ZDoom with the latest fmodex, but doing that breaks other things, so it's not a great solution.

This doesn't really count as an actual "ZDoom bug", though, so I guess there's no way to really fix anything.