I've gtk+ 2.12.9. Core stack is, --- called from signal handler with signal 11 (SIGSEGV) --- f39708fc ???????? (fa847000, fa874144, fa874140, fe9f6d08, fa803a64, 1) fe59f0d1 gdk_display_x11_finalize (fa874140, 80476b8, fa874140, fe5efef4, fe9c10d5, fa874140) + 195 fe9c4f5b g_object_unref (fa874140) + 143 fe57f897 gdk_display_close (fa874140, 0) + 5b fad6f1d3 void MOZ_gdk_display_close(_GdkDisplay*) (fa874140, 0) + 113 fad74c8a XRE_main (1, 80475b0, fa8020c0) + 5aaa 080523d5 main (1, 80475b0, 80475b8, fef65080) + 3e5 08051e7d _start (1, 8047720, 0, 8047735, 804774e, 8047799) + 7d The regression window is 2008-07-13 20:00:00 -0700 to 2008-07-13 20:25:00 -0700 I think it is bug 403706. My build config is ac_add_options --disable-tests ac_add_options --enable-debug ac_add_options --disable-optimize ac_add_options --with-system-jpeg mk_add_options MOZ_CO_PROJECT=browser ac_add_options --enable-application=browser

Which of the 5 changesets landed there was responsible?

http://hg.mozilla.org/index.cgi/mozilla-central/rev/8be867e8b341 Comment out PR_UnloadLibrary(mXineramalib); solved the problem.