AIX 5L Problem Determination - IBM Redbooks

In this example, the VMM return code 0x86 means protection exception. The
various VMM return codes, symbolic names, and meanings are provided in the
following:
0000000E This return code indicates an EFAULT. It comes from errno.h (14)
and is returned if you attempt to access an invalid address.
FFFFFFFA This return code indicates that you tried to access an invalid page
that is not in memory. This is usually the result of a page fault. This
will be returned if you try to access something that is paged out
while interrupts are disabled.
00000005 This is a hardware problem. An I/O error occurred when you tried
to page in or page out, or you tried to access a memory mapped
file and could not do it. Check the error log for disk or SCSI errors.
00000086 This return code indicates a protection exception. This means that
you tried to store to a location that is protected. This is usually
caused by low kernel memory.
0000001C This return code indicates no paging space. This means that the
system has exhausted its paging space.
Handling crash output
Some crash subcommands generate many more lines than can fit on one
screen. Also, crash does not pause the output after each screen is full. You will
want to have some way of seeing the scrolled data.
In the past, the script or tee commands were used for this. For example:
tee -a outf | crash /tmp/dump /unix | tee -a outf
There is now a new way to obtain a log file by using the set logfile subcommand.
For example:
>set logfile crash.log
Once this has been entered, crash starts logging all input and output to the
specified file. The set variable subcommand is available in AIX Version 4.1.5,
4.2.1, 4.3, and later.
In addition to the logfile support, command pipeline support was added to crash,
allowing you to pipe long output to other commands, such as more, pg, and grep.
For example:
> le 0123cc5c | grep Name
Name: /usr/lib/drivers/pse/pse
94 IBM ^ Certification Study Guide - AIX 5L Problem Determination Tools and Techniques