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Full Discussion: Memory Fault
Top Forums UNIX for Dummies Questions & Answers Memory Fault Post 18919 by Bab00shka on Thursday 4th of April 2002 08:09:14 AM
Old 04-04-2002
Hi

This happens when there is some sort of conflict within memory. A file called "core" is produced. This contains an image of the memory at the time the problem occurred. There are packages available to examine the "core" file to find out where the memory conflict occurs. But, its not always easy to trace the error.

There could be numerous reasons why this is happening. It could be that he application could require permissions or environment variables which are only available to the superuser. Although it may be just "luck" that the core dump does not happen as "superuser", such is the nature of memory faults. Do you have the source code to the application? If so, it may be worth checking the permissions/env variables theory within the code. It could also be a totally unrelated error in the source code.

Sorry to be vague, but memory faults are unpredictable by nature and difficult to track down without usually a great deal of investigation.

Good luck!
 

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SAVECORE(8)						      System Manager's Manual						       SAVECORE(8)

NAME
savecore - save a core dump of the operating system SYNOPSIS
savecore dirname [ system ] DESCRIPTION
Savecore is meant to be called at the end of the /etc/rc file. Its function is to save the core dump of the system (if one was made) and to write a reboot message in the shutdown log. It saves the core image in the file dirname/core.n and its corresponding namelist in dirname/unix.n. The second argument is the namelist for the system which made the core image; the current system is always assumed to be /unix. The trailing ".n" in the pathnames is replaced by a number which grows every time savecore is run in that directory. Before savecore writes out a core image, it reads a number from the file dirname/minfree. If there are fewer free blocks on the file sys- tem which contains dirname than the number obtained from the minfree file, the core dump is not done. If the minfree file does not exist, savecore always writes out the core file (assuming that a core dump was taken). Savecore also writes a reboot message in the shut down log. If the system crashed as a result of a panic, savecore records the panic string in the shut down log too. If savecore detects that the system time is wrong because of a crash (the time in the core image is after the current time), it will reset the system time to its best estimate of the time, which is the time in the core image plus the elapsed time since the reboot. It announces the time that it set when this occurs. FILES
/usr/adm/shutdownlogshutdown log /unix current UNIX BUGS
The method used to determine whether a dump is present, and to prevent the same core image from being saved multiple times, is not elegant. This information should be passed to init by the system; however, this is difficult because the system may have to be rebooted a second time if the root filesystem is patched. 3rd Berkeley Distribution SAVECORE(8)

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