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Title: Segfault in gc with cyclic trash Status in oslo.messaging: Invalid Status in Python: Fix Released Status in python3.4 package in Ubuntu: Fix Released Status in python3.4 source package in Trusty: In Progress Bug description: Trusty's python3.4 package is affected by python bug http://bugs.python.org/issue21435. This bug was fixed in http://hg.python.org/cpython/rev/64ba3f2de99c. Trusty should pull this fix into the python3.4 package. Note this definitely affects some python projects. `git clone https://git.openstack.org/openstack/oslo.messaging && cd oslo.messaging && edit tox.ini file, copy py33 target and rename to py34 && tox -repy34` will segfault due to this bug. With previous versions of python unaffected by this bug there is no segfaulting. Now for details, broken using: $ lsb_release -rd Description: Ubuntu 14.04.1 LTS Release: 14.04 $ apt-cache policy python3.4 python3.4: Installed: 3.4.0-2ubuntu1 Candidate: 3.4.0-2ubuntu1 Version table: *** 3.4.0-2ubuntu1 0 500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages 100 /var/lib/dpkg/status If I install the following python3.4 packages for Unicorn on Trusty this bug is corrected. The Unicorn packages here on lp for python3.4 are python3.4.1 which includes the bug fix for this bug. libpython3.4_3.4.1-10ubuntu1_amd64.deb libpython3.4-dev_3.4.1-10ubuntu1_amd64.deb libpython3.4-stdlib_3.4.1-10ubuntu1_amd64.deb python3.4-dbg_3.4.1-10ubuntu1_amd64.deb python3.4-minimal_3.4.1-10ubuntu1_amd64.deb libpython3.4-dbg_3.4.1-10ubuntu1_amd64.deb libpython3.4-minimal_3.4.1-10ubuntu1_amd64.deb python3.4_3.4.1-10ubuntu1_amd64.deb python3.4-dev_3.4.1-10ubuntu1_amd64.deb Note I installed the -dbg packages too just in case I needed to use gdb but that wasn't necessary as the test case works with these newer versions of python. $ apt-cache policy python3.4 python3.4: Installed: 3.4.1-10ubuntu1 Candidate: 3.4.1-10ubuntu1 Version table: *** 3.4.1-10ubuntu1 0 100 /var/lib/dpkg/status 3.4.0-2ubuntu1 0 500 http://az2.clouds.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages [Impact] This python bug can cause python processes that tickle it to segfault python. This means there could be a significant number of python packages that are broken when run under this interpreter. The fix for this bug should be backported to avoid seemingly random and hard to debug segfaults from happening when users use python. Unicorn's 3.4.1 packages fix this bug by including the patch at http://hg.python.org/cpython/rev/64ba3f2de99c. [Test Case] There is a test case detailed in the upstream bug http://bugs.python.org/issue21435, though I have been doing the following instead: git clone https://git.openstack.org/openstack/oslo.messaging cd oslo.messaging git fetch https://review.openstack.org/openstack/oslo.messaging refs/changes/90/118790/2 && git checkout FETCH_HEAD tox -repy34 # This should end with segfaulting test runners. Note if you don't have tox installed you will need to install version 1.7.2 or greater. `sudo pip install tox==1.7.2` will do this. [Regression Potential] The patch in question is small. If we go straight to python 3.4.1 the diff will be larger but that isn't necessary to fix this particular issue. The biggest regression potential would be that the garbage collector is newly broken by the this bug fix. Considering that the garbage collector is already broken and this patch comes with test cases to check it is less broken the risk of regression here is less than the pain of dealing with this bug. To manage notifications about this bug go to: https://bugs.launchpad.net/oslo.messaging/+bug/1367907/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
