CRASH(8) — UNIX Programmer’s Manual
NAME
crash − examine system images
SYNOPSIS
/etc/crash [system_image] [system_namelist]
DESCRIPTION
crash is used to examine system memory images interactively. It can be run on-line against /dynix and /dev/kmem. It may also be run against a savecore of a crashed system. It can read both vmcore and the compressed vmcore.ZZ formats of core image "on-the-fly". The help command lists available commands.
help lists the following commands:
| Name | Long Name | Description |
| or Option | ||
| (D) | Debug | change debug settings |
| (dis) | disassemble | disassemble addr count |
| (hdr) | bufhdr | buffer headers |
| (dp) | dp | dump physical |
| i.e., dp addr [count] [dhoxDHOXcs] | ||
| (dv) | dv | dump virtual |
| i.e., dv addr [count] [dhoxDHOXcs] | ||
| (file) | file | file table |
| (inode) | inode | inode table |
| (kfp) | kfp | frame pointer for kernel stack |
| trace start | ||
| (every) | every | repeat periodically |
| (ex) | expr | evaluate expressions |
| (e) | engine | display engine tables |
| (map) | map | display resources maps |
| (N) | News | news and features |
| (p) | proc | process table (one per line) |
| −l | process table (long listing) | |
| −r | RUN & ONPROC procs only | |
| −o | ONPROC procs only | |
| (q) | quit | quit or exit |
| (set) | set var=expr | set variable equal to expression value |
| (s) | stack | kernel stack trace (all procs) |
| −r | kernel stack modifier (display | |
| registers) | ||
| −f | kernel stack modifier (use kfp value) | |
| −e value | kernel stack trace (give engine #) | |
| value | kernel stack trace (give proc #) | |
| (t) | trace | turn on debug tracing |
| (upte) | upte | dump user pte’s (give proc #) |
| (u) | user | display user area (give proc #) |
| (vnode) | vnode | dump a vnode table (sort of) |
| (vtop) | vtop | virtual to physical |
| !! | escape to shell | |
| !!! | repeat last command | |
| .<file> | source a file | |
| (?) | ? | print this list of available commands |
| (h) | help | print this list of available commands |
| (w) | what | interpret addresses, symbols or |
| expressions |
FILES
/dev/kmemdefault system image
/dynixdefault system namelist
SEE ALSO
WARNINGS
This command is intended for system debugging and is not supported software.
4BSD/DYNIX