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Full Discussion: Segmentation fault (core dumped)
Top Forums UNIX for Dummies Questions & Answers Segmentation fault (core dumped) Post 14962 by thehoghunter on Friday 8th of February 2002 10:23:13 AM
Old 02-08-2002
You can get a core dump because of many things. It normally is because of environment variables not being correct. I get the following every time I forget to set my term to vt100 -

$ echo $TERM
dtterm
$ vi /etc/motd
dtterm: Unknown terminal type

[Using open mode]
Segmentation Fault(coredump)
$ ls -l core
-rw-r--r-- 1 tghunter sysadmin 562480 Feb 8 10:13 core
$ file core
core: ELF 32-bit MSB core file SPARC Version 1, from 'vi'


As you can see I tried to vi a file but my term was dtterm instead of vt100 (I was doing a telnet to another server). It dumps a core file which can be removed. Programmers will use core files to check their code when they have a problem. Most admins have a cron job to remove core files from the filesystems (but watch out, some applications have files called somethingcore - removing them causes headaches!)

Example of programmers having problems:
Calls to Performance Library routines cause segmentation faults. What could be wrong and what can I do?

You may be experiencing stack overflow in your program. There are two types of stack space that need to be addressed.

First, there is the stack space allocated to a process. This is controlled by the limit command. Try unlimiting your process stack by saying:

% unlimit stacksize
Secondly, if your program is multi-threaded each thread must have its own stack space. This is controlled by the ${STACKSIZE} environment variable. The units are in KB so saying:

% setenv STACKSIZE 4000
sets each thread's stack size to 4 MB. This is the minimum value that Performance Library requires, so make sure that ${STACKSIZE} is set to at least 4000. You may need to increase this value if your program uses large stack based variables.
thehoghunter
 

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LEARN ABOUT OPENDARWIN

fmd

fmd(1M)                                                   System Administration Commands                                                   fmd(1M)

NAME

       fmd - fault manager daemon

SYNOPSIS

       /usr/lib/fm/fmd/fmd [-V] [-f file] [-o opt=val] [-R dir]

DESCRIPTION

       fmd is a daemon that runs in the background on each Solaris system. fmd receives telemetry information relating to problems detected by the
       system software, diagnoses these problems, and initiates proactive self-healing activities  such  as  disabling  faulty  components.   When
       appropriate, the fault manager also sends a message to the syslogd(1M) service to notify an administrator that a problem has been detected.
       The message directs administrators to a knowledge article on Sun's web site, http://www.sun.com/msg/, which explains more about the problem
       impact and appropriate responses.

       Each  problem  diagnosed by the fault manager is assigned a Universal Unique Identifier (UUID). The UUID uniquely identifes this particular
       problem across any set of systems. The fmdump(1M) utility can be used to view the list of problems diagnosed by the  fault  manager,  along
       with  their UUIDs and knowledge article message identifiers. The fmadm(1M) utility can be used to view the resources on the system believed
       to be faulty. The fmstat(1M) utility can be used to report statistics kept by the fault manager. The fault manager is started automatically
       when  Solaris  boots, so it is not necessary to use the fmd command directly. Sun's web site explains more about what capabilities are cur-
       rently available for the fault manager on Solaris.

OPTIONS

       The following options are supported

       -f file                 Read the specified configuration file prior to searching for any of the default fault manager configuration files.

       -o opt=value            Set the specified fault manager option to the specified value. Fault manager options are currently a Private inter-
                               face; see attributes(5) for information about Private interfaces.

       -R dir                  Use the specified root directory for all pathnames evaluated by the fault manager, instead of the default root (/).

       -V                      Print the fault manager's version to stdout and exit.

EXIT STATUS

       The following exit values are returned:

       0                       Successful completion

       1                       An error occurred which prevented the fault manager from initializing, such as failure to open the telemetry trans-
                               port.

       2                       Invalid command-line options were specified.

FILES

       /etc/fm/fmd             Fault manager configuration directory

       /usr/lib/fm/fmd         Fault manager library directory

       /var/fm/fmd             Fault manager log directory

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWfmd                      |
       +-----------------------------+-----------------------------+
       |Interface Stability          |Evolving                     |
       +-----------------------------+-----------------------------+

SEE ALSO

       svcs(1), fmadm(1M), fmdump(1M), fmstat(1M), syslogd(1M), attributes(5), smf(5)

       http://www.sun.com/msg/

NOTES

       The Fault Manager is managed by the service management facility, smf(5), under the service identifier:

        svc:/system/fmd:default

       The service's status can be queried using the svcs(1) command. Administrators should not disable the Fault Manager service.

SunOS 5.10                                                          17 Nov 2004                                                            fmd(1M)
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