Help! Xlib error

[Peter Hutterer]

On Wed, May 05, 2010 at 04:16:02PM +0800, Ma, Qingyu (GE Healthcare) wrote:
> My application use openGL to draw some image on window, and modify led
> state on keyboard through faking key event. The operations are executed
> at 33ms interval.
> If I add some system pressure, after long time execution, there is a
> rare possibility to occur below two errors. 
>  
> #1
> XIO: fatal IO error 0 (Success ) on X server "-"
>        after 21 requests (9 known processed) with 0 event remaining.
>  
> #2
> X Error of failed request:  BadLength (poly request too large or
> internal Xlib length error)
>   Major opcode of failed request:  148 (XTEST)
>   Minor opcode of failed request:  2 (X_XTestFakeInput)
>   Serial number of failed request:  16
>   Current serial number in output stream:  20 X Error of failed request:
> BadLength (poly request too large or internal Xlib length error)
>   Major opcode of failed request:  148 (XTEST)
>   Minor opcode of failed request:  2 (X_XTestFakeInput)
>   Serial number of failed request:  15
>   Current serial number in output stream:  20
>  
>  
> I didn't find any clue in Xorg.0.log and message log.
> The system pressure is, Mem: 40MB free and 500MB swap is used, CPU: 95%,
> continuous disk writing, opengl demo(moving gear).
>  
> Could you please tell me what may cause these two errors?  It's urgent.
> Thanks very much.

hmm. BadLength is usually a server or an Xlib bug. Can you provide the code
that reproduces this issue?

Cheers,
  Peter