STINNER Victor added the comment:

Oh wow! The commit 1fef0154d97bd7f01c5bc59954a278bacf1a3f0e fixed PGO 
compilation on Python 2.7: 
http://buildbot.python.org/all/builders/AMD64%20Debian%20PGO%202.7/builds/227 
is the first successful build since June 20. I didn't notice that the PGO 
buildbot was also stuck in running test_weakref in the compile step: job killed 
after 30 min.
---
...
0:06:01 [380/400] test_warnings
0:06:02 [381/400] test_wave
0:06:02 [382/400] test_weakref

command timed out: 1200 seconds without output running ['make', 'all'], 
attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=1699.111100
---

While build 206 was green, the buildbot started to fail in build 207:

http://buildbot.python.org/all/builders/AMD64%20Debian%20PGO%202.7/builds/207

The strange thing is that this change only contains two small changes:
* commit b39a7481ee7e6166d6d2b252a7a514b1f6553dfa
* commit d4324baca4c03eb8d55446cd1b74b32ec5633af5

I fail to understand how these changes make test_weakref hangs.

Well, at least the good news is that it's now fixed ;-)

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue29796>
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