[Bug: 21.4.12] xemacs: X Error of failed request: BadWindow(invalid Window parameter)

[Ben Wing]

> about once a week or so i get the following errors. 
> ----------------------------------------------------
> 
> xemacs: X Error of failed request:  BadWindow (invalid Window 
> parameter)
>   Major opcode of failed request:  25 (X_SendEvent)
>   Resource id in failed request:  0x28284f0
>   Serial number of failed request:  2529824
>   Current serial number in output stream:  2529825
> Xlib: unexpected async reply (sequence 0x269a21)!
> 
> xemacs: X Error of failed request:  BadWindow (invalid Window 
> parameter)
>   Major opcode of failed request:  18 (X_ChangeProperty)
>   Resource id in failed request:  0x28284f0
>   Serial number of failed request:  2529823
>   Current serial number in output stream:  2529825
> -----------------------------------------------------
> 
> when this happens xemacs locks up and i have to kill the process.
> 
> this first started about 5 months ago and was only occasional 
> (once a month so so) but now it happens about every other week.
> 
> i do not know what i was doing when this happened all i can 
> say is that when i went to xemacs to look at a file it was 
> hung. this is typically the case. one minute it is fine and 
> the next its hung.

We need a backtrace to diagnose this.  Could you put in an abort() in
device-x.c directly after the call to XmuPrintDefaultErrorMessage (disp,
event, stderr)?  Then use a debugger to get a backtrace from the core dump.