I managed to invoke an error:
check_mst -file MR12.5plus
Begin checker
Read collection 0.5
Read collection 1.0
Read collection 1.2
Read collection 1.5
Read collection 2.0
Read collection 3.0
Begin Crossreference.
Checking collection 0.0.
Checking collection 1.0.
Error: Linkage error by trace_catch_|2740
(>system_library_standard>bound_trace_)
referencing trace_error_halt_|trace_error_halt_
Segment not found.
Searching the Multics source code yielded no results for trace_error_halt_ other then the reference in bound_trace_.
Investigation led to searching the 12.5 total.crossref, which yielded:
-------------------- ***** NOT FOUND ***** --------------------
trace_error_halt_ (?)
table_full (?) trace_catch_.alm
table_index_oob (?)
trace_catch_.alm
trace_error_halt_ (?)
trace_catch_.alm
Somebody forgot to write some code?
trace_catch_.alm is in >ldd>sss>s>bound_trace_.s.archive. It just isn't found by peruse_crossref (pcref). I suspect the cross-ref creation tools are blowing the finding of it.
As far as I know, this was fixed with MCR10004 some time ago.
Closing as ticket moved here: http://multics-trac.swenson.org/ticket/21