<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - hang waiting for a reply message (xcb_wait_for_reply)" href="https://bugs.freedesktop.org/show_bug.cgi?id=94108#c12">Comment # 12</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - hang waiting for a reply message (xcb_wait_for_reply)" href="https://bugs.freedesktop.org/show_bug.cgi?id=94108">bug 94108</a> from <a class="email" href="mailto:bertrand.piolin@windriver.com" title="Bp_at_wind <bertrand.piolin@windriver.com>"> Bp_at_wind</a> <pre>(In reply to Uli Schlachter from <a href="show_bug.cgi?id=94108#c9">comment #9</a>) > 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?</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>