https://bugzilla.redhat.com/show_bug.cgi?id=1087720
--- Comment #8 from Matthew Heon mheon@redhat.com --- PR out: https://github.com/dotcloud/docker/pull/6544
It appears that Signal 19 is actually forwarded, also. SIGSTOP cannot be caught, so it was actually preventing my script from printing out that it was received. So it's only Signal 17 that's not forwarded.