Thread error in 5.2-RC2

Hi

I am running 5.2-RC2 with a GENERIC kernel. I am having some problem with a 
certain port that I compiled on my machine. When I try to run 'gnucash', it 
crashes in 'guile' with the following error:

Fatal error 'Unable to read from thread kernel pipe' at line 1100 in file /
usr/src/lib/libc_r/uthread/uthread_kern.c (errno = 0)

Line 1100 in uthread_kern.c is in function dequeue_signals(), when it is 
trying to clear the pthread kernel pipe (from the comments near the point of 
failure).

I am not sure where to start looking now. I am assuming this is related to the 
various thread libraries in -current. (This is my first exposure to 
-current). Any suggestions appreciated, in particular how to debug similar 
problems and if there are any documents I can refer to for debugging on 
-current. Please let me know if more information is needed.

Thanks.

kaarthik