Public bug reported: [Impact]
* systemd-shutdown binary is executed to complete system shutdown. In xenial, it calls sync() after killing all processes, and not before killing them. This means that processes are racing the SIGKILL/TERM timeouts to sync all IO to disk. To mitigate this race condition, and make the shutdown process more reliable the sync() should also happen before process killing spree starts. [Fix] Backport upstream commit https://github.com/systemd/systemd/commit/2e79d1828a8da9b3af1b052297e3617905ec94f3 [Test Case] * Make sure systems still shuts down, including e.g. root on raid. [Regression Potential] * Shutdowns may appear to be slower due to two sync() calls instead of one * However total shutdown time should not be impacted much, as there really should not be much additional IO caused by killing all processes. ** Affects: systemd (Ubuntu) Importance: Undecided Status: Fix Released ** Affects: systemd (Ubuntu Xenial) Importance: Undecided Status: New ** Also affects: systemd (Ubuntu Xenial) Importance: Undecided Status: New ** Changed in: systemd (Ubuntu) Status: New => Fix Released -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1722481 Title: systemd should sync disks, before killing all processes on shutdown Status in systemd package in Ubuntu: Fix Released Status in systemd source package in Xenial: New Bug description: [Impact] * systemd-shutdown binary is executed to complete system shutdown. In xenial, it calls sync() after killing all processes, and not before killing them. This means that processes are racing the SIGKILL/TERM timeouts to sync all IO to disk. To mitigate this race condition, and make the shutdown process more reliable the sync() should also happen before process killing spree starts. [Fix] Backport upstream commit https://github.com/systemd/systemd/commit/2e79d1828a8da9b3af1b052297e3617905ec94f3 [Test Case] * Make sure systems still shuts down, including e.g. root on raid. [Regression Potential] * Shutdowns may appear to be slower due to two sync() calls instead of one * However total shutdown time should not be impacted much, as there really should not be much additional IO caused by killing all processes. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1722481/+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
