utility creates tar a archive that contains all files needed for
debugging FreeBSD kernel crash (vmcore, kernel, loaded modules,
sources that appear in backtrace). This is useful for debugging a
crash on another host, sending it to developers or if you are going to
upgrade the kernel on crashed host but would like to keep crashdump in
case the developers ask you to provide additional info.
Created tar archive contains also a script that when being run
inside unpacked archive will give
session with crash core loaded in it. The script should be run with
root privileges because it does
archives the most recent core dump in the core dump directory. A
specific core dump may be specified via either the
has located a core dump, it analyzes the core dump to determine the
exact version of the kernel that generated the core. It then looks
for a matching kernel file under each of the subdirectories in
The location of the kernel file can also be explicitly provided via the
argument. By default the resulting tar archived is stored in the core
dump directory with a name
The options are as follows:
Print the minihelp and exit.
Specify an alternate core dump directory.
The default crash dump directory is
Use the core dump saved in
instead of the latest core in the core dump directory.
Specify an explicit kernel file.
Specify an explicit core file.