** Tags added: testcase -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to pygtk in Ubuntu. https://bugs.launchpad.net/bugs/664920
Title: SRU: 100% CPU usage when calling a child process from a python script Status in PyGTK: GTK+ for Python: Unknown Status in “pygtk” package in Ubuntu: Fix Released Status in “pygtk” source package in Lucid: New Status in “pygtk” source package in Maverick: Fix Committed Status in “pygtk” source package in Natty: Fix Released Bug description: == Impact == pygtk apps which handle signals busy-loop in the glib main loop dispatch, causing 100% CPU usage after a signal is received. This commonly occurs when spawned child processes exit. == TEST CASE == A simple testcase (pygtk-signal-testcase.py) is attached. To trigger the bug, run the testcase and send the process SIGCHLD. When run with pygtk 2.22-0ubuntu1 the test process will now consume 100% CPU. == Regression Potential == PyGTK is core infrastructure, so the potential impact of a regression is high. However, the patch is small and clearly correct, and the file descriptor being read from is nonblocking, so it should not cause application hangs even if it tries to read more bytes than are there. Original bugreport follows: When creating a child process from a python script that uses pygtk 2.21, such subprocess.check_call(), 100% of the CPU is used (technically, 100% of the core the python interpreter is using). If the creation of the child processes are removed, the script runs as expected. According to user exarkun on the #python IRC channel, the problem may be manifesting when the child process exits. It may be related to a bug that was fixed in 9.10, but broken in 9.04. If that is the case, this is the relevant bug report: https://bugzilla.gnome.org/show_bug.cgi?id=481569 The code in which I noticed this problem is in the videometadata.py module of Rapid Photo Downloader: http://bazaar.launchpad.net/~dlynch3/rapid/trunk/annotate/head%3A/rapid/videometadata.py#L189 ProblemType: Bug DistroRelease: Ubuntu 10.10 Package: python-gtk2 2.21.0-0ubuntu1 ProcVersionSignature: Ubuntu 2.6.35-22.35-generic 2.6.35.4 Uname: Linux 2.6.35-22-generic x86_64 Architecture: amd64 Date: Thu Oct 21 22:51:42 2010 InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007) ProcEnviron: PATH=(custom, user) LANG=en_US.utf8 SHELL=/bin/bash SourcePackage: pygtk To manage notifications about this bug go to: https://bugs.launchpad.net/pygtk/+bug/664920/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
