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crash(8) [netbsd man page]

CRASH(8)						    BSD System Manager's Manual 						  CRASH(8)

crash -- examine and debug system images SYNOPSIS
crash [-M core] [-N kernel] DESCRIPTION
The crash command is used to examine and debug system images. If run without any arguments, crash operates on the running system. The options are as follows: -M core Operate on the specified crash dump instead of the default /dev/mem. Crash dumps should be from the same version of the system and same machine architecture as the running version of crash, and must be uncompressed. -N kernel Extract the name list from the specified kernel instead of the default /dev/ksyms. The command syntax used by crash is the same as the in-kernel debugger. See the ddb(4) manual page for more information. Operations and facilities that require a running system, such as breakpoints, are not supported by crash. crash does not provide pagination. However, by using the pipe symbol, output may be sent to commands available from the shell. For example: crash> ps | more crash> ps | grep ioflush SEE ALSO
ps(1), vmstat(1), ddb(4), pstat(8) HISTORY
The crash command appeared in NetBSD 6.0. BSD
March 7, 2009 BSD

Check Out this Related Man Page

CRASH(L)																  CRASH(L)

crash - analyze kernel dump or active system image SYNOPSIS
crash [ aps ] [ -bdvtiz ] [ -s sfile ] [ -c cfile ] [ -u addr ] DESCRIPTION
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 aps Print PS & PC at time of interupt (doesn't do anything) 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. The following options may be specified. -b Brief mode; skip general display of processes. Only the currently selected process will be traced. -c cfile 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". -s sfile 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". -u addr Force a process to be displayed as if it were active when the crash occurred. addr is the octal address of the proc table entry. FILES
/unix system namelist /dev/swap swap device /usr/sys/core core file SEE ALSO
crash(8), adb(1), ps(1), rstat(1) DIAGNOSTICS
Missing arg Unable to Open file Format Error in symbolfile BUGS
Care should be used in running crash on "/dev/mem". Things can change while crash is running; the picture it gives is only a close approx- imation to reality. AUTHOR
Mike Muuss, JHU EE John Stewart, Teledyne Geotech March 1983 CRASH(L)

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