Guys, sorry for the bad description of the problem - I'm learning things as I debug at this time. I think it would be good if you don't invest too much effort in debugging this at this point :-)
I now realized that xrootd no longer uses the glibc version to decide whether the custom semaphore should be used, but instead one has to pass -DUSE_LIBC_SEMAPHORE=1 to cmake to activate the glibc implementation. I now did this and the code also crashes, but with a different backtrace.
Then I found that the crash only happens if I link my code with a specific version of a library of ours. If I don't link that library than the problem disappears. After realizing this I was able to reproduce the crash on my laptop with glibc 2.24. So it might be a problem in our code after all.
I will report back when I'm done debugging, it's possible that we can just close this issue at that point.
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