Stefan Krah <stefan-use...@bytereef.org> added the comment:

I can't pinpoint the exact causes for each individual test failure. I assumed 
that they are caused by threading/signal issues, because the tests pass when 
Python is compiled --without-threads.


But here's a list of possible culprits for future reference:

[pthread's execve(2) breaks close(2)]
http://cvs.openbsd.org/cgi-bin/query-pr-wrapper?full=yes&numbers=6183

[SIGCHLD handler is called at bad timing when linked to libpthread]
http://cvs.openbsd.org/cgi-bin/query-pr-wrapper?full=yes&numbers=6273

[pthread: 100% CPU usage after execv]
http://cvs.openbsd.org/cgi-bin/query-pr-wrapper?full=yes&numbers=6376

[pthread: file descriptors are "pseudo-blocking"]
http://www.mail-archive.com/m...@openbsd.org/msg80643.html

[test_siginterrupt_off broken by libpthread's internal hooking of signals]
[test_itimer_prof broken by libpthread's internal use of SIGPROF]
http://www.openbsd.org/cgi-bin/cvsweb/ports/lang/python/2.6/patches/patch-Lib_test_test_signal_py

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