Public bug reported:
I'm using qtcreator-plugin-ubuntu
3.1.1+15.10.20150508-0ubuntu1i~0trusty1 from the Trusty PPA.
I'm currently porting my Ubuntu App to Android, so I have my android
phone connected to my computer using USB.
A few days ago I noticed that qtcreator started using a complete CPU
core soon after startup, which makes working with qtcreator quite
unpleasant (sluggish interface, and CPU fan noise). After some time (30
minutes?), it is then no longer possible to start a build process in
qtcreator for what appears to be a strange reason. I no longer have the
error message. I guess this is because of some kind of ressource leak.
Now I noticed these popping up in ps aux quite frequently while it happens:
> x 10209 8.0 0.0 19696 2972 ? S 14:57 0:00 /bin/bash
> /usr/share/qtcreator/ubuntu/scripts/device_version 007692f760d6239b
> x 10233 0.0 0.0 19696 304 ? S 14:57 0:00 /bin/bash
> /usr/share/qtcreator/ubuntu/scripts/device_version 007692f760d6239b
> x 10234 0.0 0.0 19696 1888 ? S 14:57 0:00 /bin/bash
> /usr/share/qtcreator/ubuntu/scripts/device_version 007692f760d6239b
And this test shows that something, probably qtcreator, is forking almost 30
times per second:
$ while true; do ps aux | grep OnlyFindGrepItself; sleep 10; done
> x 10841 0.0 0.0 18980 2152 pts/0 S+ 14:58 0:00 grep
> --color=auto OnlyFindGrepItself
> x 11132 0.0 0.0 18980 2152 pts/0 S+ 14:58 0:00 grep
> --color=auto OnlyFindGrepItself
> x 11406 0.0 0.0 18980 2152 pts/0 R+ 14:58 0:00 grep
> --color=auto OnlyFindGrepItself
As soon as I disconnect my android device from the USB port, the CPU fan
goes silent and there's no significant CPU usage any more.
So I guess that something in the qt creator Ubuntu plugin tries to detect my
android phone as an Ubuntu device, fails, and then instantly tries again.
This is from qtcreator strace and repeats quite often as well: read(36,
"/system/bin/sh: chroot: not found\r\n", 35) = 35
Looks like something is trying to use chroot on my phone, and my Android
lollipop can't do that. So the device_version script might not be the only
thing that keeps my system busy.
** Affects: qtcreator-plugin-ubuntu (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1456627
Title:
Almost unusuable while non-Ubuntu device connected through adb
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