This bug was fixed in the package apt - 1.5.2 --------------- apt (1.5.2) artful; urgency=medium
* apt.conf.autoremove: Catch some new Ubuntu module packages (LP: #1778551) * Fix lock counting in debSystem (LP: #1778547) -- Julian Andres Klode <juli...@ubuntu.com> Tue, 26 Jun 2018 12:51:24 +0200 ** Changed in: apt (Ubuntu Xenial) Status: Fix Committed => Fix Released -- You received this bug notification because you are a member of नेपाली भाषा समायोजकहरुको समूह, which is subscribed to Xenial. Matching subscriptions: Ubuntu 16.04 Bugs https://bugs.launchpad.net/bugs/1778547 Title: Broken system lock counting Status in apt package in Ubuntu: Fix Committed Status in apt source package in Xenial: Fix Released Status in apt source package in Artful: Fix Released Status in apt source package in Bionic: Fix Released Bug description: [Impact] System lock unrefing is broken, off-by-one error. Locking twice opens a second fd for the lock file, and the old fd gets lost and remains open for the remaining duration of the program [Test case] Executing the following script should show one lock file in the first line, and none in the last line. def maybe_readlink(path): try: return os.readlink(path) except: return "<deleted>" import os, apt_pkg apt_pkg.init() apt_pkg.pkgsystem_lock() apt_pkg.pkgsystem_lock() print([(p, maybe_readlink("/proc/self/fd/" + p)) for p in os.listdir("/proc/self/fd")]) apt_pkg.pkgsystem_unlock() apt_pkg.pkgsystem_unlock() print([(p, maybe_readlink("/proc/self/fd/" + p)) for p in os.listdir("/proc/self/fd")]) [Test output] good, cosmic: [('0', '/dev/pts/2'), ('1', '/dev/pts/2'), ('2', '/dev/pts/2'), ('3', '/var/lib/dpkg/lock'), ('4', '<deleted>')] [('0', '/dev/pts/2'), ('1', '/dev/pts/2'), ('2', '/dev/pts/2'), ('3', '<deleted>')] bad, bionic: [('0', '/dev/pts/0'), ('1', '/dev/pts/0'), ('2', '/dev/pts/0'), ('3', 'pipe:[40889331]'), ('4', '/var/lib/dpkg/lock'), ('5', '/var/lib/dpkg/lock'), ('6', '<deleted>'), ('17', 'socket:[53931]')] [('0', '/dev/pts/0'), ('1', '/dev/pts/0'), ('2', '/dev/pts/0'), ('3', 'pipe:[40889331]'), ('4', '/var/lib/dpkg/lock'), ('5', '<deleted>'), ('17', 'socket:[53931]')] [Regression potential] A locking change can potentially break locking, but this one seems like an obvious off-by-one error. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1778547/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~group.of.nepali.translators Post to : group.of.nepali.translators@lists.launchpad.net Unsubscribe : https://launchpad.net/~group.of.nepali.translators More help : https://help.launchpad.net/ListHelp