[Xcb] [Bug 94461] New: Compiz freezes when undocking Lenovo T450s, hang in xcb_wait_for_reply/wait_for_reply/_xcb_conn_wait

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94461

            Bug ID: 94461
           Summary: Compiz freezes when undocking Lenovo T450s, hang in
                    xcb_wait_for_reply/wait_for_reply/_xcb_conn_wait
           Product: XCB
           Version: 1.11
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Library
          Assignee: xcb at lists.freedesktop.org
          Reporter: cs_gon at yahoo.com
        QA Contact: xcb at lists.freedesktop.org

Created attachment 122174
  --> https://bugs.freedesktop.org/attachment.cgi?id=122174&action=edit
compiz stack trace

When undocking my Lenovo T450s from the docking station (with external monitor
connected), compiz frequently freezes, especially when an application is
running, that does a lot of screen updates (i.e. terminal with top running at a
low refresh frequency, or something like glxgears).

This happens since updating a 14.04 system to the Wily HWE stack (libxcb 1.10),
but it is also reproducible when using Xenial (with libxcb 1.11).

When compiz freezes, the screen gets kinda corrupted (will attach an screen
shot). The screen does not get updated, only the mouse cursor works. When
docking the notebook again, compiz recovers most of the time. Sometimes though,
nothing happens and compiz keeps frozen. In this state only a restart of compiz
or the X-Server (from the text console) help to get the system usable again.

When doing a stack trace on compiz, it hangs in xcb_wait_for_reply /
wait_for_reply / _xcb_conn_wait. I will attach the full stack trace. The stack
trace was captured with libxcb 1.10, but as mentioned above, the problem does
also happen with libxcb 1.11).

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