Comment #6 on issue 1732 by reinhold...@gmail.com: occasional segfault when compiling input/regression/midi/key-initial.ly
http://code.google.com/p/lilypond/issues/detail?id=1732
The error message "throw from within critical section." indicates that this is a problem somewhere in threaded GUILE (they are using critical sections instead of finer-grained mutexes).
In particular, a (throw ...) function was called in guile, while guile was in a critical section (i.e. one where no error should occur). In that case, guile's libguile/throw.c simply exists. Unfortunately, it does not print out the exception that was thrown, so it's really hard to track down where the problem lies...
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