12-13-2010
I used to run a cron script to find core files, generate reports on them (stack trace if possible, ownership or file output at least), save them in /tmp compressed (in case they are important and might get overwritten), and email the report to the dev group. People write a lot of unattended scripts with loose error checking, and a core report may raise awareness of a hole in the code or why a periodic process has no effect. So, search everywhere for a file called core, run it through ls -l and file, and see what has been dying! Also, do not run code in unwritable directories if you want a core.
The cd is much overused in the popular UNIX pragma. There are lots of ways to handle paths without $PWD, like X cut/paste and command recall. It makes shell command history less useful! Life is simpler if you stay home most of the time!
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LEARN ABOUT NETBSD
savecore
SAVECORE(8) BSD System Manager's Manual SAVECORE(8)
NAME
savecore -- save a core dump of the operating system
SYNOPSIS
savecore [-fvz] [-N system] [-Z level] [directory]
savecore -c [-v] [-N system]
savecore -n [-v] [-N system]
DESCRIPTION
When the NetBSD kernel encounters a fatal error, the panic(9) routine arranges for a snapshot of the contents of physical memory to be writ-
ten into a dump area, typically in the swap partition.
Upon a subsequent reboot, savecore is typically run out of rc(8), before swapping is enabled, to copy the kernel and the saved memory image
into directory, and enters a reboot message and information about the core dump into the system log. If a directory is not specified, then
/var/crash is used.
The kernel and core file can then be analyzed using various tools, including crash(8), dmesg(8), fstat(1), gdb(1), iostat(8), netstat(1),
ps(1), and pstat(8), to attempt to deduce the cause of the crash.
Crashes are usually the result of hardware faults or kernel bugs. If a kernel bug is suspected, a full bug report should be filed at
http://www.netbsd.org/, or using send-pr(1), containing as much information as possible about the circumstances of the crash. Since crash
dumps are typically very large and may contain whatever (potentially confidential) information was in memory at the time of the crash, do NOT
include a copy of the crash dump file in the bug report; instead, save it somewhere in the event that a NetBSD developer wants to examine it.
The options are as follows:
-c Only clears the dump without saving it, so that future invocations of savecore will ignore it.
-f Forces a dump to be taken even if the dump doesn't appear correct or there is insufficient disk space.
-n Check whether a dump is present without taking further action. The command exits with zero status if a dump is present, or with
non-zero status otherwise.
-N Use system as the kernel instead of the default (returned by getbootfile(3)). Note that getbootfile(3) uses secure_path(3) to
check that kernel file is ``secure'' and will default to /netbsd if the check fails.
-v Prints out some additional debugging information.
-z Compresses the core dump and kernel (see gzip(1)).
-Z level Set the compression level for -z to level. Defaults to 1 (the fastest compression mode). Refer to gzip(1) for more information
regarding the compression level.
savecore checks the core dump in various ways to make sure that it is current and that it corresponds to the currently running system. If it
passes these checks, it saves the core image in directory/netbsd.#.core and the system in directory/netbsd.# (or in
directory/netbsd.#.core.gz and directory/netbsd.#.gz, respectively, if the -z option is used). The ``#'' is the number from the first line
of the file directory/bounds, and it is incremented and stored back into the file each time savecore successfully runs.
savecore also checks the available disk space before attempting to make the copies. If there is insufficient disk space in the file system
containing directory, or if the file directory/minfree exists and the number of free kilobytes (for non-superusers) in the file system after
the copies were made would be less than the number in the first line of this file, the copies are not attempted.
If savecore successfully copies the kernel and the core dump, the core dump is cleared so that future invocations of savecore will ignore it.
SEE ALSO
fstat(1), gdb(1), gzip(1), netstat(1), ps(1), send-pr(1), crash(8), dmesg(8), iostat(8), pstat(8), rc(8), syslogd(8), panic(9)
HISTORY
The savecore command appeared in 4.1BSD.
BUGS
The minfree code does not consider the effect of compression.
BSD
September 13, 2011 BSD