severity 400635 important reassign 400635 libxrandr2 forcemerge 400441 400635 thanks
As you stated in your followup, this issue does not apply to unstable. As documented in the NEWS.Debian of libx11-6 2:1.1-1 and newer in experimental, this type of assertion represents a locking bug in software invoking libx11, not a bug in XCB or Xlib. Does your x-session-manager alternative point to gnome-session? If so, we know about the problem; it occurs due to a locking bug in libxrandr2 (bug 400441), and a fixed version of libxrandr2 should hit unstable soon. Under the assumption that this describes your bug report, I've reassigned to libxrandr2 and merged with 400441; if not, please provide a gdb backtrace so we can track down the source of the problem. - Josh Triplett
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