Is this an X bug?

Adam Jackson ajax at
Mon Aug 2 10:45:54 PDT 2010

On Mon, 2010-08-02 at 12:21 -0400, Bob Self wrote:
> I'm running Ubuntu linux and am getting lockups. When it 'locks up' sometimes I can login via
> ssh, sometimes everything is halted. When I can log in I always find that X is stuck at 100% cpu.
> I have found this in /var/log/Xorg.0.log.old after rebooting via a ssh connection.
> [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 (xf86PostButtonEventP+0xcf) [0x80c29cf]
> 3: /usr/bin/X (xf86PostButtonEvent+0x6c) [0x80c2a7c]
> 4: /usr/lib/xorg/modules/input/ (0x7d4000+0x4c67) [0x7d8c67]
> 5: /usr/bin/X (0x8048000+0x6d5bf) [0x80b55bf]
> 6: /usr/bin/X (0x8048000+0x122744) [0x816a744]
> 7: (vdso) (__kernel_sigreturn+0x0) [0x149400]
> Does anyone know what this means?

You stopped the backtrace just before it got interesting.  All we see
there is the SIGIO signal handler being entered and calling into the
input driver, which then tries to eat an event from the kernel and has
no place to put it because the core server is stuck not processing input

So whatever's going on in stack frame 8 is to blame.

- ajax
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