Public bug reported:
If an application stops in the middle of a call to XQueryPointer - e.g., hits a
breakpoint in gdb - the whole X server freezes until the application is
resumed. That also makes it difficult to resume the application.
It looks like XQueryPointer acquires some kind of a global lock in X. So if
another application - such as the window manager - makes a call to
XQueryPointer, the call won't return until the first application finishes
executing it.
Steps to reproduce:
1. Start Firefox
2. Attach gdb to it
3. Set a breakpoint in XQueryService.
4. When the breakpoint gets hit, set another one at xcb_wait_for_reply
5. When the second breakpoint is hit, X will be frozen
I'm using Kubuntu 9.04.
** Affects: ubuntu
Importance: Undecided
Status: New
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X server freezes while the application is executing XQueryPointer
https://bugs.launchpad.net/bugs/400374
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