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.\" Copyright (c) 2008 Yahoo!, Inc.
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. Neither the name of the author nor the names of any co-contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $FreeBSD$
.\"
.Dd December 2, 2020
.Dt CRASHINFO 8
.Os
.Sh NAME
.Nm crashinfo
.Nd "analyze a core dump of the operating system"
.Sh SYNOPSIS
.Nm
.Op Fl d Ar crashdir
.Op Fl n Ar dumpnr
.Op Fl k Ar kernel
.Op Ar core
.Sh DESCRIPTION
The
.Nm
utility analyzes a core dump saved by
.Xr savecore 8 .
It generates a text file containing the analysis in the same directory as
the core dump.
For a given core dump file named
.Pa vmcore.XX
the generated text file will be named
.Pa core.txt.XX .
.Pp
By default,
.Nm
analyzes the most recent core dump in the core dump directory.
A specific core dump may be specified via either the
.Ar core
or
.Ar dumpnr
arguments.
Once
.Nm
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
.Pa /boot .
The location of the kernel file can also be explicitly provided via the
.Ar kernel
argument.
.Pp
Once
.Nm
has located a core dump and kernel,
it uses several utilities to analyze the core including
.Xr dmesg 8 ,
.Xr fstat 1 ,
.Xr iostat 8 ,
.Xr ipcs 1 ,
.Xr kgdb 1 ,
.Xr netstat 1 ,
.Xr nfsstat 1 ,
.Xr ps 1 ,
.Xr pstat 8 ,
and
.Xr vmstat 8 .
Note that kgdb must be installed from the devel/gdb port or gdb package.
.Pp
The options are as follows:
.Bl -tag -width indent
.It Fl b
Run in batch mode.
Write most messages to the
.Pa core.txt.XX
file instead of the terminal.
This flag is used when
.Nm
is run during boot.
.It Fl d Ar crashdir
Specify an alternate core dump directory.
The default crash dump directory is
.Pa /var/crash .
.It Fl n Ar dumpnr
Use the core dump saved in
.Pa vmcore. Ns Ar dumpnr
instead of the latest core in the core dump directory.
.It Fl k Ar kernel
Specify an explicit kernel file.
.El
.Sh SEE ALSO
.Xr textdump 4 ,
.Xr savecore 8
.Sh HISTORY
The
.Nm
utility appeared in
.Fx 6.4 .
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