-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 05/24/2013 01:28 PM, Marius Gedminas wrote: > I was trying to debug a failing ZEO test case > (testConcurrentUpdates), and found out it had nothing to do with ZEO. > There's a bug either in BTrees or in ZODB itself that causes data > corruption under Python 3.x. > > Here's a test case: > https://gist.github.com/mgedmin/5644876#file-zodbfail_simple-py > > It initializes an OOBTree to {0:0, 1:0, 2:0}, then launches two > threads that attempt just one write each: > > tree[1] = 1 # thread 1 tree[2] = 2 # thread 2 > > All transactions are committed successfully and the end result > _sometimes_ is {0:0, 1:0, 2:2} instead of the expected {0:0, 1:1, > 2:2}. > > There's also a larger test case (zodbfail.py) that modifies more than > one item in a thread. That one fails pretty reliably. > > This only happens under Python 3.x. > > To reproduce:: > > git clone git://gist.github.com/5644876.git zodbfail cd zodbfail > detox
Thanks for the detective work! I can confirm the bug, and that it is in the BTrees C extensions (the tests pass after 'rm .tox/py32/lib/python3.2/site-packages/BTrees/*.so'). Tres. - -- =================================================================== Tres Seaver +1 540-429-0999 tsea...@palladion.com Palladion Software "Excellence by Design" http://palladion.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with undefined - http://www.enigmail.net/ iEYEARECAAYFAlGgFIsACgkQ+gerLs4ltQ5QxgCgves8VGndIxt37UCV/CPMKeuw t3EAoK+gwFE3SNOpBSLJ0p+mZ4ftP7gl =wxp6 -----END PGP SIGNATURE----- _______________________________________________ For more information about ZODB, see http://zodb.org/ ZODB-Dev mailing list - ZODB-Dev@zope.org https://mail.zope.org/mailman/listinfo/zodb-dev
