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[Mitch Walker <mitch@xxxxxxxxxxxxx>]

Pretty sure I'm also getting this problem.

System:

Ubuntu 10.04 LTS

X.Org X Server 1.7.6
Release Date: 2010-03-17
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.24-25-server i686 Ubuntu
Current Operating System: Linux metro 2.6.32-22-generic #36-Ubuntu SMP Thu Jun 3 22:02:19 UTC 2010 i686
Kernel command line: root=UUID=bd093912-d6dc-454b-b709-ae4b992b6bf2 ro quiet splash 
Build Date: 23 April 2010  05:11:50PM
xorg-server 2:1.7.6-2ubuntu7 (Bryce Harrington <bryce@xxxxxx>) 
Current version of pixman: 0.16.4

Xorg.0.log
...
[mi] EQ overflowing. The server is probably stuck in an infinite loop.

Backtrace:
0: /usr/bin/X (xorg_backtrace+0x3b) [0x80e937b]
1: /usr/bin/X (mieqEnqueue+0x1ab) [0x80e8b6b]
2: /usr/bin/X (xf86PostMotionEventP+0xd2) [0x80c2d02]
3: /usr/lib/xorg/modules/input/evdev_drv.so (0x171000+0x48a1) [0x1758a1]
4: /usr/lib/xorg/modules/input/evdev_drv.so (0x171000+0x4b96) [0x175b96]
5: /usr/bin/X (0x8048000+0x6d5bf) [0x80b55bf]
6: /usr/bin/X (0x8048000+0x122794) [0x816a794]
7: (vdso) (__kernel_sigreturn+0x0) [0x259400]

Usage:

This has happened twice now in the last three days, but I've never seen
it before now.  I'm running a dual-monitor setup on a Dell Latitude
E6400, with separate X screens (instead of XRandR or Xinerama).  I
switch between the screens with a simple X program that I wrote to
create a small window on the target screen, warp the pointer, then close
the display.  I switch screens pretty frequently and without thinking
about it, so this program may have triggered the problem both times.

Symptoms:

The mouse pointer goes to the junction of the screens (left of right
screen/right of left screen) and flickers rapidly.  It can be moved a
little with the mouse, but only ~1/5 screen from it's new favorite
place, and after any deflection it always returns to the junction.  The
keyboards (both external and built-in) seem to be completely locked out,
because nothing responds to key-strokes, including any attempts to get a
virtual terminal (CTRL + ALT + F[1-7]).  I have not attempted to kill
the X server with CTRL + ALT + BACKSPACE.

I can log in from another machine (SSH),  and, in line with the earlier
comments, Xorg is using an entire core.  It ignores a SIGTERM, but
SIGKILL works and gets me back to the GDM login.

Please feel free to contact me if you need any more details.

-- 
EQ overflowing
https://bugs.launchpad.net/bugs/563598
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