It looks like some recursion in get_private. Sorry if the lines don't match, we have a slightly modified version including the fix for https://bugs.launchpad.net/ubuntu/+source/overlay-scrollbar/+bug/1188831

Thread [1] 4645 (Suspended : Container)	
	__GI__IO_default_xsputn() at /build/buildd/eglibc-2.17/libio/genops.c:464 0x7f8282a96b09	
	_IO_vfprintf_internal() at /build/buildd/eglibc-2.17/stdio-common/vfprintf.c:1,334 0x7f8282a63917	
	__GI___vasprintf_chk() at /build/buildd/eglibc-2.17/debug/vasprintf_chk.c:66 0x7f8282b2af41	
	vasprintf() at /usr/include/x86_64-linux-gnu/bits/stdio2.h:210 0x7f826a3bebeb	
	g_vasprintf() at /build/buildd/glib2.0-2.36.0/./glib/gprintf.c:314 0x7f826a3bebeb	
	g_strdup_vprintf() at /build/buildd/glib2.0-2.36.0/./glib/gstrfuncs.c:517 0x7f826a39c8fd	
	g_logv() at /build/buildd/glib2.0-2.36.0/./glib/gmessages.c:878 0x7f826a387112	
	g_log() at /build/buildd/glib2.0-2.36.0/./glib/gmessages.c:1,010 0x7f826a387492	
	g_type_check_instance_cast() at /build/buildd/glib2.0-2.36.0/./gobject/gtype.c:4,044 0x7f826a664dfb	
	hijacked_scrollbar_hide() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:3,398 0x7f824005799b	
	0x7f827eb9aeb0	
	0x7f827c8b20b0	
	0x7f827eb99cf0	
	0x7f827eb99cf0	
	get_private() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:692 0x7f8240057c26	
	get_private() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:627 0x7f8240057c26	
	get_private() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:675 0x7f8240057b1b	
	get_private() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:627 0x7f8240057b1b	
	get_private() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:692 0x7f8240057c26	
	get_private() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:627 0x7f8240057c26	
	get_private() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:675 0x7f8240057b1b	
	get_private() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:627 0x7f8240057b1b	
	get_private() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:692 0x7f8240057c26	
	get_private() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:627 0x7f8240057c26	
	get_private() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:675 0x7f8240057b1b	
	get_private() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:627 0x7f8240057b1b	
	get_private() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:692 0x7f8240057c26	
	get_private() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:627 0x7f8240057c26	
	get_private() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:675 0x7f8240057b1b	
	get_private() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:627 0x7f8240057b1b	
	get_private() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:692 0x7f8240057c26	
	get_private() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:627 0x7f8240057c26	
	get_private() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:675 0x7f8240057b1b	
	get_private() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:627 0x7f8240057b1b	
	get_private() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:692 0x7f8240057c26	
	get_private() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:627 0x7f8240057c26	
	get_private() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:675 0x7f8240057b1b	
	get_private() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:627 0x7f8240057b1b	
	get_private() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:692 0x7f8240057c26	
	get_private() at /build/buildd/overlay-scrollbar-0.2.16+r359daily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:627 0x7f8240057c26	....

and near the botom 

      thumb_button_release_event_cb() at /build/buildd/overlay-scrollbar-0.2.16+r359ddaily13.05.30/build/gtk2/os/../../../os/os-scrollbar.c:1799
0x7f824005ae34