> > >> > Could it be the case that firefox-bin hangs in umtxn state?
> > >> you're right!
> > >> > These trace the wrong process: the wrapper shell script (sh).
> > >> > ktracing with child processes (-i).
> > >> Do you know which port/lib causing this hang on _umtx_op?
> > > build hangs in umtxn state while running a tool called shlibsign.
> > > to after the unpretty xorg-7.4 changes just yet.
> > > no old leftover libraries or binaries were still lying around.
> >     Have you read UPDATING yet about the libxcb upgrade?
> this unless I am very much mistaken.