1.\" Copyright (c) 2008 Yahoo!, Inc. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. Neither the name of the author nor the names of any co-contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" $FreeBSD$ 29.\" 30.Dd April 19, 2017 31.Dt CRASHINFO 8 32.Os 33.Sh NAME 34.Nm crashinfo 35.Nd "analyze a core dump of the operating system" 36.Sh SYNOPSIS 37.Nm 38.Op Fl d Ar crashdir 39.Op Fl n Ar dumpnr 40.Op Fl k Ar kernel 41.Op Ar core 42.Sh DESCRIPTION 43The 44.Nm 45utility analyzes a core dump saved by 46.Xr savecore 8 . 47It generates a text file containing the analysis in the same directory as 48the core dump. 49For a given core dump file named 50.Pa vmcore.XX 51the generated text file will be named 52.Pa core.txt.XX . 53.Pp 54By default, 55.Nm 56analyzes the most recent core dump in the core dump directory. 57A specific core dump may be specified via either the 58.Ar core 59or 60.Ar dumpnr 61arguments. 62Once 63.Nm 64has located a core dump, 65it analyzes the core dump to determine the exact version of the kernel 66that generated the core. 67It then looks for a matching kernel file under each of the subdirectories in 68.Pa /boot . 69The location of the kernel file can also be explicitly provided via the 70.Ar kernel 71argument. 72.Pp 73Once 74.Nm 75has located a core dump and kernel, 76it uses several utilities to analyze the core including 77.Xr dmesg 8 , 78.Xr fstat 1 , 79.Xr iostat 8 , 80.Xr ipcs 1 , 81.Xr kgdb 1 , 82.Xr netstat 1 , 83.Xr nfsstat 1 , 84.Xr ps 1 , 85.Xr pstat 8 , 86and 87.Xr vmstat 8 . 88.Pp 89The options are as follows: 90.Bl -tag -width indent 91.It Fl b 92Run in batch mode. Write most messages to the 93.Pa core.txt.XX 94file instead of the terminal. This flag is used when 95.Nm 96is run during boot. 97.It Fl d Ar crashdir 98Specify an alternate core dump directory. 99The default crash dump directory is 100.Pa /var/crash . 101.It Fl n Ar dumpnr 102Use the core dump saved in 103.Pa vmcore. Ns Ar dumpnr 104instead of the latest core in the core dump directory. 105.It Fl k Ar kernel 106Specify an explicit kernel file. 107.El 108.Sh SEE ALSO 109.Xr textdump 4 , 110.Xr savecore 8 111.Sh HISTORY 112The 113.Nm 114utility appeared in 115.Fx 6.4 . 116