A signal 4 is an illegal instruction (see the man page on signal or kill), which
probably means that there was a memory overlay somewhere -- either netmon
overlaid his own memory or someone else did it for him -- so that when the
instruction which was at that location came to be executed, it was corrupted.
Please don't confuse a sig 4 with a compile error -- the instruction was legal
at the time the code was compiled. It became illegal because all or part of it
was changed or replaced at run-time.
What can you do about it? Well, very little. You should probably call Support
as the first step, because the situation is basically like this:
If you are not at 5.1.2, then you should get there, because (a) the fix may
already be in that level and (b) even if it is not, any fix from this point on
will require that level as a base.
If you are at 5.1.2, then your only option is to call Support and gather some
data so they can isolate the problem. Look in /usr/OV/PD/cores/netmon. Do you
have a core? If so, that will help. If you are on AIX, you can run
/usr/OV/service/readcore against the core and get a report which gives the call
stack so Support can tell you if it has been reported before. But readcore
requires the AIX utility, dbx, be installed. You get that off the AIX CD if you
haven't installed it already -- its part of the application debugger set.
If you don't have AIX, but Solaris or Digital Unix, you must call Support so
that they can give you utilities to help with the same job.
And you could also format the nettl logs:
netfmt -f /usr/OV/log/nettl.LOG00 > "myfile1"
netfmt -f /usr/OV/log/nettl.LOG01 > "myfile2"
and look for errors about the time that this happened. You may also be asked to
run the netmon trace with all options until this happens again so that Support
can see what leads up to it.
Of course, you could do all this even if you were not at 5.1.2, but it may be
pointless, if Support tells you they already have a fix and that's where it is.
James Shanks
Tivoli (NetView for UNIX) L3 Support
Scott Hammons <SHammons@MCBRIDE.COM> on 12/10/99 03:52:10 PM
Please respond to Discussion of IBM NetView and POLYCENTER Manager on NetView
<NV-L@UCSBVM.UCSB.EDU>
To: NV-L@UCSBVM.UCSB.EDU
cc: (bcc: James Shanks/Tivoli Systems)
Subject: Netmon exited on Signal 4
This has happened twice in the last week. Has anyone seen this error
before. I checked the Diagnosis Guide and it has the reason for exited on
signal 11, but not exited on signal 4.
Scott Hammons
McBride and Associates, Inc.
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