Public bug reported:
I'm using Ubuntu Hardy Heron, and I just got back to my computer and for
the third time I found it completely hung with no mouse cursor, no
response and a single frozen image from the screen saver is visible (I
use the screensaver called "busy spheres" and I think it uses openGL?
not sure). The screen saver image also has some defects in it along the
borders. I have attached a screenshot (photo) of what it looks like.
This is what I know:
* the machine is completely unresponsive through the usual keyboard/mouse (I
don't see any mouse curosor even).
* I can however SSH to the machine so the kernel is still operating correctly.
* If I start the "top" program I can see X spinning permanently at 100% (and
this does not go away; I've tried waiting for more than 15minutes). This is
what it looks like in top:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
3487 root 20 0 264m 3292 2496 R 99.2 0.2 26:19.56 Xorg
1 root 20 0 2844 1688 544 S 0.0 0.1 0:01.16 init
2 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 kthreadd
3 root 15 -5 0 0 0 S 0.0 0.0 0:00.94 ksoftirqd/0
4 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/0
5 root 15 -5 0 0 0 S 0.0 0.0 0:00.08 events/0
* Further, I also know that all commands that require super user privileges
doesn't work. The first thing I tired was to launch a "sudo gdb" in order to
attach to X.org and see what it's doing but this "sudo gdb" command just hangs
too, blocking indefinatelt and I can't even press CTRL-C on it. Also, other
commands such as "sudo su", "su strace" and even "sudo apt-get install
something" will also hang and I can't CTRL-B out of them. Basically, whenever I
run anything command as a super user that ssh connection becomes unusable so I
have to connect a new ssh client to continue trying other stuff.
* I also know that this doesn't happen all the time, most of the time when I
get back to my computer I just move the mouse a little bit and the screensaver
(busy spheres) goes away I can continue use my machine normally. I've ran into
this freeze/hang bug three times since I installed hardy (so the bug happens
about once a week). Note that I always leave this machine on over night though
so it's getting a pretty nice stress test each night I suppose?
* I did not have any problems like this with ubuntu gutsy gibbon. I most have
left this machine on over night every single day for at least 5 months with
gutsy gibbon installed and using the exact same screen saver. I never ever saw
this bug using gutsy gibbon.
I have an intel 965GM gfx card and I use compiz. I will attach x.org
conf and log later today. If there is any additional information I can
provide which will help you track down this bug, let me know.
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
--
x.org hangs during screensaver (100% CPU, no mouse cursor, no response)
https://bugs.launchpad.net/bugs/234768
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
--
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
