Public bug reported:

I start fcitx through terminal, getting some normal-looking output(attached). 
The process shows up, consuming over 1GB of memory. There's no popup, nothing 
on the notification area, it just runs invisibly.
Tracking it through htop, I can see the memory usage grow at the rate of about 
100MB per second. It doesn't respond to TERM, and if I don't kill the process 
it hangs the entire system after about 30 seconds, presumably just by eating 
too much ram.

I've been trying input methods out and messing with configs, but before
reporting this bug I did apt-get purge on all of them ( ibus, fcitx,
scim) and installed fcitx from scratch, and the result is the same.

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: fcitx 1:4.2.9.1-6
ProcVersionSignature: Ubuntu 4.10.0-28.32-generic 4.10.17
Uname: Linux 4.10.0-28-generic x86_64
ApportVersion: 2.20.4-0ubuntu4.5
Architecture: amd64
CurrentDesktop: XFCE
Date: Mon Jul 31 20:49:21 2017
EcryptfsInUse: Yes
InstallationDate: Installed on 2017-07-29 (2 days ago)
InstallationMedia: Xubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
PackageArchitecture: all
SourcePackage: fcitx
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: fcitx (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug zesty

** Attachment added: "output on starting fcitx"
   
https://bugs.launchpad.net/bugs/1707694/+attachment/4924689/+files/2017-07-31_55%3A47.png

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https://bugs.launchpad.net/bugs/1707694

Title:
  fcitx memory usage grows on startup until hang

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