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Created attachment 426446 [details]
$HOME/.mwmrc

Description of problem:
Passive button grabs can get stuck, resulting in an unresponsive desktop. One reproducer is described below, there are likely other applications that trigger the same behaviour.

Version-Release number of selected component (if applicable):
xorg-x11-server-1.7.7-12.el6.x86_64

How reproducible:
Install the mwm window manager and install the $HOME/.mwmrc attached. Start up a plain X server, mwm and two xterms. Then hit Alt+mouse button1 over one of the terminals. The mouse is now unresponsive.

Steps to Reproduce:
1. start a plain X server
2. start mpwm
3. start two xterms
4. press Alt+Button1
5. desktop is unresponsive
 
Additional info:
Seems to be caused by invalid ButtonPress event delivery when a passive grab without the ButtonPress mask is activated.

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release.  Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release.  This request is not yet committed for
inclusion.

MODIFIED

xorg-x11-server-1.7.7-16.el6 is available in brew.

Tested and Verified using reproducer from comment 0 on xorg-x11-server-common-1.7.7-26.el6.
Moving to VERIFIED.

Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.