c96f5471ce7d and its following fix has been applied to Bionic.
** Changed in: linux (Ubuntu)
Status: Fix Committed => Fix Released
** Changed in: linux (Ubuntu Bionic)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1747769
Title:
Cherry pick c96f5471ce7d for delayacct fix
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Artful:
Fix Released
Status in linux source package in Bionic:
Fix Released
Bug description:
== SRU Justification ==
Mainline commit e33a9bba85a8 introduced a regression in v4.11-rc1. This
regression
caused delayacct_blkio_end() to be called by try_to_wake_up().
However, the call was made before we have context-switched. This patch is now
correct, in that
the delay accounting ends when the I/O is complete.
Commit c96f5471ce7 is in mainline as fo v4.15-rc9.
== Fix ==
commit c96f5471ce7d2aefd0dda560cc23f08ab00bc65d
Author: Josh Snyder <jo...@netflix.com>
Date: Mon Dec 18 16:15:10 2017 +0000
delayacct: Account blkio completion on the correct task
== Regression Potential ==
Low. This commit has also been cc'd to stable, so it has had additional
upstream
review.
== Test Case ==
A test kernel was built with this patch and tested by the original bug
reporter.
The bug reporter states the test kernel resolved the bug.
Please cherry pick upstream commit c96f5471ce7d ("delayacct: Account
blkio completion on the correct task") into the Ubuntu 4.13 kernel. It
has also been accepted into the Linux stable branch as 4.14.15.
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