.TH CRASH L "March 1983" 
.SH NAME
crash \- analyze kernel dump or active system image
.SH SYNOPSIS
.B crash
[ aps ]
[ -bdvtiz ]
[ -s sfile ]
[ -c cfile ]
[ -u addr ]
.SH DESCRIPTION
.nf
Synopsis of options -
-b	Brief mode; skip general display of processes
-d	Crash dump contains swap image.  (default?)
-v	Verbose; dump much information about each proc [future]
-t	TTY structs to be dumpped
-i	Incore inode table to be printed
-c FILE	Provide non-standard file name for system image input
-s FILE Provide non-standard symboltable input
-u ADDR	Trace a process other than currently selected one
-z	Interrupt Trace displayed
\fIaps\fR	Print PS & PC at time of interupt (doesn't do anything)
.fi
.PP
.I crash
examines a dump of unix which it looks for in the file
sysdump.  It prints out the contents of the general
registers, the kernel stack and a traceback through the
kernel stack.  If an aps is specified, the ps and pc at
time of interrupt are also printed out.  The dump of the
stack commences from a "reasonable" address and all addresses
are relocated to virtual addresses by using the value of
kdsa6 found in the dump.
.PP
The following options may be specified.
.IP -b
Brief mode; skip general display of processes.  Only the currently
selected process will be traced.
.IP "-c \fIcfile\fR"
If the -c argument is found, the following argument
is taken to be the name of a file containing the system image.
The default is "/usr/sys/core".
.IP "-s \fIsfile\fR"
If the -s argument is found the following argument is taken
to be the name of a file, containing a symbol table which
should be used in interpreting text addresses.
The default is "/unix".
.IP "-u \fIaddr\fR"
Force a process to be displayed as if it were active when the
crash occurred.  \fIaddr\fR is the octal address of the proc
table entry.
.SH FILES
.ta \w'/usr/sys/core 'u
/unix	system namelist
.br
/dev/swap	swap device
.br
/usr/sys/core	core file
.SH "SEE ALSO"
crash(8), adb(1), ps(1), rstat(1)
.SH DIAGNOSTICS
Missing arg
Unable to Open \fIfile\fR
Format Error in \fIsymbolfile\fR
.SH BUGS
Care should be used in running
.I crash
on "/dev/mem".
Things can change while
.I crash
is running; the picture it gives is only a close
approximation to reality.
.SH AUTHOR
Mike Muuss, JHU EE
.br
John Stewart, Teledyne Geotech