vmunix: sendsig: bad user stack

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#2425

From: Brian Fitzgerald
Date: Fri, 18 Dec 1992 17:27

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I have found that if I startup a shell, but interrupt it immediately
with ^C, I get:

fitzgb@mml0.meche /fitzgb (22) bash -norc
^C^C
^C^C^C^C^CIllegal instruction (core dumped)

In /var/adm/messages I get 

Dec 18 00:56:31 mml0 vmunix: sendsig: bad user stack pid=6856, sig=11
Dec 18 00:56:31 mml0 vmunix: usp is ffffffdc, action is 3eac0, upc is e00482e

I'm interested to know ...

--  Why would interrupting a program during startup result in an illegal
instruction signal?

--  What do the log messages mean?

--  Why does the log message say "sig=11" (segmentation fault), but
"Illegal instruction", (signal 4), is printed on my terminal.

Sun3 os 4.1.1

Brian

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Message-ID: <w6n2=sg@rpi.edu>

Path: arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!rpi!fitzgb

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Newsgroups: comp.unix.internals
Path: arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!rpi!fitzgb
From: fitzgb@mml0.meche.rpi.edu (Brian Fitzgerald)
Subject: vmunix: sendsig: bad user stack
Message-ID: <w6n2=sg@rpi.edu>
Nntp-Posting-Host: mml0.meche.rpi.edu
Organization: Rensselaer Polytechnic Institute, Troy, NY
Date: Fri, 18 Dec 1992 17:27:38 GMT
Lines: 25