100 lines
2.9 KiB
Groff
100 lines
2.9 KiB
Groff
.\" $NetBSD: crash.8,v 1.7 2017/07/03 21:35:30 wiz Exp $
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.\"
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.\" Copyright (c) 2009 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Andrew Doran.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd December 10, 2016
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.Dt CRASH 8
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.Os
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.Sh NAME
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.Nm crash
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.Nd examine and debug system images
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.Sh SYNOPSIS
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.Nm
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.Op Fl w
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.Op Fl M Ar core
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.Op Fl N Ar kernel
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.Sh DESCRIPTION
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The
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.Nm
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command is used to examine and debug system images.
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.Pp
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If run without any arguments,
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.Nm
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operates on the running system.
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.Pp
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The options are as follows:
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.Bl -tag -width xpalidocious
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.It Fl M Ar core
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Operate on the specified crash dump instead of the default
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.Pa /dev/mem .
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Crash dumps should be from the same version of the system and same machine
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architecture as the running version of
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.Nm crash ,
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and must be uncompressed.
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.It Fl N Ar kernel
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Extract the name list from the specified kernel instead of the default
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.Pa /dev/ksyms .
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.It Fl w
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Enable writing.
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.El
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.Pp
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The command syntax used by
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.Nm
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is the same as the in-kernel debugger.
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See the
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.Xr ddb 4
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manual page for more information.
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.Pp
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Operations and facilities that require a running system, such as breakpoints,
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are not supported by
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.Nm crash .
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.Pp
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.Nm
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does not provide pagination.
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However, by using the pipe symbol, output may be sent to commands available
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from the shell.
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For example:
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.Bd -literal -offset abcd
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crash> ps | more
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crash> ps | grep ioflush
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.Ed
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.Sh SEE ALSO
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.Xr ps 1 ,
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.Xr vmstat 1 ,
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.Xr ddb 4 ,
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.Xr pstat 8
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Nx 6.0 .
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.Sh BUGS
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The
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.Nm
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command for the sparc port is unstable.
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