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[Launchpad Bug Tracker <1652591@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package fcitx - 1:4.2.9.1-1ubuntu1.16.04.2

---------------
fcitx (1:4.2.9.1-1ubuntu1.16.04.2) xenial; urgency=medium

  * debian/patches/0014-exit-the-loop-after-trying-20-times.patch:
    Avoid 100% CPU usage on rare case (LP: #1652591)

 -- Aron Xu <happyaron@xxxxxxxxxx>  Mon, 26 Dec 2016 11:58:13 +0000

** Changed in: fcitx (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1652591

Title:
  [SRU] fcitx 100% CPU usage on rare case

Status in fcitx package in Ubuntu:
  Fix Released
Status in fcitx source package in Xenial:
  Fix Released
Status in fcitx source package in Yakkety:
  Fix Committed

Bug description:
  [Impact]

  There is a rare case that fcitx runs at 100% CPU when using Sogou
  Pinyin input method that sometimes happen after suspend/resume, even
  though the problem does not break client usages, it will drain battery
  of laptop and makes fan very noisy.

  [Test Case]
  After upgrading the package, user will not see 100% CPU usage of fcitx after frequent suspend/resume.

  [Regression Potential]
  The patch limits the call of accept() to be less than 21 times, and the calling code already has error handling when the returning value is less than 0, so the possibility of regression is minimal.

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