[Bug 30697] New: Commit "winex11: Give XInitThreads yet another chance." breaks (ancient) RHEL 5.8

http://bugs.winehq.org/show_bug.cgi?id=30697

Bug #: 30697
           Summary: Commit "winex11: Give XInitThreads yet another
                    chance." breaks (ancient) RHEL 5.8
           Product: Wine
           Version: 1.5.4
          Platform: x86-64
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: winex11.drv
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]
    Classification: Unclassified

Created attachment 40199
  --> http://bugs.winehq.org/attachment.cgi?id=40199
Backtrace from winedbg notepad.exe

Red Hat Enterprise Linux Client release 5.8 (Tikanga)

With this patch applied, applications freeze if I type to input controls.
  * wine notepad.exe : Writing into the big text field freezes notepad (pasting
text with mouse works tho)
  * winecfg : Writing text in Libraries pane for example, also freezes wine.

It works with
  * wine-1.4
  * wine-1.5.0
  * wine-1.5.2
  * wine-1.5.3

I did git bisect as told on IRC (http://wiki.winehq.org/RegressionTesting):

07bc017ff13c43bc897de730715e8b07139268ec is the first bad commit
commit 07bc017ff13c43bc897de730715e8b07139268ec
Author: Alexandre Julliard 
Date:   Sat May 5 12:13:38 2012 +0200

winex11: Give XInitThreads yet another chance.

:040000 040000 7506fd969f20eb23d7ab60e571c301989a3f8b6c
70b676142c444abd3e0e7f0baae861bff95d4334 M      dlls

Also I attached a backtrace from winedbg notepad.exe. strace says it's waiting
on a futex() call.