[Xcb] [Bug 94108] hang waiting for a reply message (xcb_wait_for_reply)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94108

--- Comment #12 from Bp_at_wind <bertrand.piolin at windriver.com> ---
(In reply to Uli Schlachter from comment #9)
> Let's try again: What are the backtraces of the other threads? Is any other
> thread inside libxcb-code?
> 
> Also, does the application use libGL / libX11 from multiple threads? 
According Qt documentation (we also checked it enabling some debug information
and attaching the debugger..), a basic renderer is used for Mesa drivers. 
This renderer is single-threaded.
Actually we are using Qt 5.4.0. You may find convenient to check out Qt
codebase. 
You will find system integration layer at:
                        qtbase/src/plugins/platforms/xcb/
And most of openGL usage at:
qtdeclarative/src/quick/scenegraph

> Is XInitThreads() called at startup?
Yes, it is. 

> 
> According to the only backtrace you provided, libX11 asks for a reply that
> we don't have yet and some other thread "grabbed" the socket. Could you get
> a debug build of libxcb and libX11 so that the backtraces provide more
> information?

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