Public bug reported:

Binary package hint: drscheme

The upgrade to libx11-6 pulled in libxcb1 1.0-1.1 as an additional
dependancy. Following this upgrade, drscheme crashes shortly after
startup with this message:

$ drscheme
mred: xcb_xlib.c:41: xcb_xlib_lock: Assertion `!c->xlib.lock' failed.
Aborted (core dumped)

This bug has been reported in Debian (#409197) and a similar bug occurs
in Java (Ubuntu #86103). This type of crash is mentioned in debian-
devel-announce at
http://people.debian.org/~terpstra/message/20061127.041128.8a08d75f.en.html
which says the message indicates "that a caller attempted to lock the
display while already locked".

A backtrace is attached to the Debian drscheme bug mentioned above.

** Affects: drscheme (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed
** Affects: drscheme (Debian)
     Importance: Unknown
         Status: Unknown

** Bug watch added: Debian Bug tracker #409197
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=409197

** Also affects: drscheme (Debian) via
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=409197
   Importance: Unknown
       Status: Unknown

-- 
drscheme crashes after upgrade to libx11-6 2:1.1.1-1ubuntu1
https://launchpad.net/bugs/87789

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