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From: jwp@uwmacc.UUCP
Newsgroups: comp.unix.questions
Subject: 4.3BSD dbx question:  internal error?
Message-ID: <1331@uwmacc.UUCP>
Date: Fri, 3-Apr-87 16:13:39 EST
Article-I.D.: uwmacc.1331
Posted: Fri Apr  3 16:13:39 1987
Date-Received: Sun, 5-Apr-87 06:12:47 EST
Organization: UWisconsin-Madison Academic Comp Center
Lines: 18
Keywords: dbx unix 4.3bsd microvax

I was using dbx on a 4.3BSD MicroVAX II, like this:

	dbx a.out
	(dbx) trace

when it said (approximately)
"internal error, reference through nil pointer at line 119 in languages.c"
and aborted the dbx session, leaving me back with my csh prompt.

What can cause such a thing?

Another curiosity is that when I said, for example, "trace dnum"
to follow a variable "dnum" it said "dnum is not defined" when in
fact dnum was declared right in the main program.

What can cause variables not to be seen by dbx?
-- 
	Jeff Percival (jwp@salvax1)