Bug 739051 - Xorg server using 100% CPU
Summary: Xorg server using 100% CPU
Alias: None
Product: Fedora
Classification: Fedora
Component: xorg-x11-server
Version: 15
Hardware: x86_64
OS: Linux
Target Milestone: ---
Assignee: X/OpenGL Maintenance List
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2011-09-16 12:17 UTC by Matan Ziv-Av
Modified: 2018-04-11 19:14 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2012-08-07 19:13:47 UTC

Attachments (Terms of Use)
strace of X process while using 100% CPU. fd 6 is /dev/tty2, fd 7 is /dev/vga-arbiter (65.13 KB, text/plain)
2011-09-16 12:17 UTC, Matan Ziv-Av
no flags Details
xorg.conf (2.86 KB, application/octet-stream)
2011-09-21 09:46 UTC, Matan Ziv-Av
no flags Details
Xorg.0.log file (19.12 KB, text/plain)
2012-01-19 23:57 UTC, John Horne
no flags Details
Output of the dmesg command (75.55 KB, text/plain)
2012-01-19 23:58 UTC, John Horne
no flags Details
xorg.conf file (111 bytes, text/plain)
2012-01-19 23:59 UTC, John Horne
no flags Details
/etc/X11/xorg.conf.d/00-nvidia.conf file (185 bytes, text/plain)
2012-01-20 00:00 UTC, John Horne
no flags Details
/etc/X11/xorg.conf.d/00-system-setup-keyboard.conf file (316 bytes, text/plain)
2012-01-20 00:01 UTC, John Horne
no flags Details
/etc/X11/xorg.conf.d/local.x11.conf file (448 bytes, text/plain)
2012-01-20 00:01 UTC, John Horne
no flags Details
/var/log/messages file (3.68 MB, text/plain)
2012-01-20 00:17 UTC, John Horne
no flags Details
Some output from 'strace' of PID 2151 (110.85 KB, text/plain)
2012-01-20 00:25 UTC, John Horne
no flags Details

Description Matan Ziv-Av 2011-09-16 12:17:56 UTC
Created attachment 523551 [details]
strace of X process while using 100% CPU. fd 6 is /dev/tty2, fd 7 is /dev/vga-arbiter

Description of problem:

Sometimes X server uses 100% CPU time, and continues using it until the process is killed.

Version-Release number of selected component (if applicable):


Additional info:

KDE desktop on Fedora 15 (with latest updates). The problem started a few months ago. 

X might start using 100% CPU time even on minimal use (only one konsole open). 

Sometimes a day or two might go without the problem appearing and at other times it happens every few minutes.

When X starts to use 100% CPU, the following line appears in log file:

Sep 16 15:13:38 matan systemd[1]: getty@tty2.service holdoff time over, scheduling restart.

strace of X process while it is using 100% CPU is attached.

Comment 1 Matěj Cepl 2011-09-21 00:10:42 UTC
This seems like an obvious problem, but some more information about the context, could be helpful. Please add drm.debug=0x04 to the kernel command line, restart computer, and attach

* your X server config file (/etc/X11/xorg.conf, if available),
* X server log file (/var/log/Xorg.*.log*; check with grep Backtrace /var/log/Xorg* which logs might be the most interesting ones, send us at least Xorg.0.log)
* output of the dmesg command, and
* system log (/var/log/messages)

to the bug report as individual uncompressed file attachments using the bugzilla file attachment link above.

We will review this issue again once you've had a chance to attach this information.

Thanks in advance.

Comment 2 Matan Ziv-Av 2011-09-21 09:46:44 UTC
Created attachment 524172 [details]

Comment 3 John Horne 2012-01-19 23:45:11 UTC
I am seeing the same problem on my F15 PC. An strace shows similar output to that of the reporter, but mainly the 'select(256,...' and 'EIO' lines (didn't see many read/write lines at all).

I have rebooted with 'drm.debug=0x04' and will send the requested files when the problem occurs.

Comment 4 John Horne 2012-01-19 23:57:29 UTC
Created attachment 556421 [details]
Xorg.0.log file

Comment 5 John Horne 2012-01-19 23:58:43 UTC
Created attachment 556422 [details]
Output of the dmesg command

Comment 6 John Horne 2012-01-19 23:59:23 UTC
Created attachment 556423 [details]
xorg.conf file

Comment 7 John Horne 2012-01-20 00:00:30 UTC
Created attachment 556424 [details]
/etc/X11/xorg.conf.d/00-nvidia.conf file

Comment 8 John Horne 2012-01-20 00:01:23 UTC
Created attachment 556425 [details]
/etc/X11/xorg.conf.d/00-system-setup-keyboard.conf file

Comment 9 John Horne 2012-01-20 00:01:59 UTC
Created attachment 556426 [details]
/etc/X11/xorg.conf.d/local.x11.conf file

Comment 10 John Horne 2012-01-20 00:17:49 UTC
Created attachment 556428 [details]
/var/log/messages file

I had to chop the file down since bugzilla didn't like 40MB. It is now 3.7MB in size, but includes all the output for the day when I was doing this (19 Jan 2012).

Comment 11 John Horne 2012-01-20 00:24:52 UTC
Should have added kernel and xorg server rpm versions:

uname -a
Linux jhorne #1 SMP Tue Nov 29 11:53:48 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

rpm -q xorg-x11-server-xorg

'top' command is currently showing:

Tasks: 178 total,   2 running, 176 sleeping,   0 stopped,   0 zombie
Cpu(s):  5.8%us, 44.5%sy,  0.0%ni, 49.7%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   7921400k total,  1932692k used,  5988708k free,    62132k buffers
Swap:  8388604k total,        0k used,  8388604k free,   680824k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                 
 2151 root      20   0  183m  35m 9084 R 100.3  0.5  39:43.26 X                      
 2611 john      20   0  591m  25m  16m S  0.3  0.3   0:09.54 konsole                 
    1 root      20   0 58116  25m 1888 S  0.0  0.3   0:04.54 systemd                 
    2 root      20   0     0    0    0 S  0.0  0.0   0:00.03 kthreadd

As can be seen PID 2151 the 'X' server is using 100% CPU time.

Comment 12 John Horne 2012-01-20 00:25:52 UTC
Created attachment 556430 [details]
Some output from 'strace' of PID 2151

Comment 13 Jérôme Glisse 2012-01-20 00:47:12 UTC
John you are using closed source driver we can't help you.

Comment 14 Fedora End Of Life 2012-08-07 19:13:49 UTC
This message is a notice that Fedora 15 is now at end of life. Fedora
has stopped maintaining and issuing updates for Fedora 15. It is
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