Messages in this thread | | | From | Keith Owens <> | Subject | New ksymoops that handles modules (was Re: How to translate an oops) | Date | Thu, 22 Oct 1998 01:06:41 +1000 |
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On Sat, 17 Oct 1998 15:19:00 +0200 (MET DST), dwguest@win.tue.nl (Guest section DW) wrote: Probably really Andries.Brouwer@cwi.nl >In fact, the program ksymoops found in linux/scripts is worthless junk. > >First of all, it is in C++. On many machines it does not compile. >Secondly, it is not robust at all. It will only work when given the >precise Oops output (and sometimes it even dumps core on an actual Oops). >It does not work with Oops output that someone copied down by hand. > >Maybe someone with a little spare time can write a real ksymoops.c. >[Or perhaps it has been written, and only linux/scripts/ksymoops.cc has to >be replaced?]
Ask and ye shall receive :).
ftp://ftp.ocs.com.au/pub/ksymoops.c.gz (a link to ksymoops-0.1.c.gz).
Bug reports directly to kaos@ocs.com.au please. Patches for other architectures and/or sample Oops logs will be gratefully accepted.
>And a ksymoops.8 wouldnt harm either.
No ksymoops.8 yet, everything is documented in the source. From the start of the code :-
Read a kernel Oops file and make the best stab at converting the code to instructions and mapping stack values to kernel symbols.
Why another ksymoops I hear you ask? Various complaints about ksymoops.cc -
* It requires C++. * It has hard wired limitations on the number of symbols. * It does not handle modules at all. * Very rigid requirements on the format of input, especially the Oops log. * No cross checking between ksyms, modules, System.map etc. * Very little error checking, diagnostics are not suitable for beginners. * It only prints the trace and decoded code, users have to manually extract the other lines from the Oops. * Gives up on the slightest problem. * Only handles i386 and possibly m68k. The code is difficult to extend to other architectures. * Stops after the first Oops, you have to manually extract each one and run through ksymoops one at a time.
This version is - * C. * No hard wired limitations (malloc as far as the eye can see). * Handles modules by default. * Uses regular pattern matching so it is a lot more forgiving about input formats. * By default, cross checks ksyms, modules, System.map and vmlinux. * Lots of diagnostics and error checking. * Prints all relevant lines for a complete Oops report. * Tries to provide output no matter how bad the input is. The level of progress and error reporting is aimed at beginners. * Still only handles i386 and possibly m68k, but it is a lot easier to extend to other architectures (patches and/or sample data gratefully accepted). * Handles all Oops in the input file(s).
Usage: ksymoops [-v vmlinux] Where to read vmlinux [-V] No vmlinux is available [-o object_dir] Directory containing modules [-O] No modules is available [-k ksyms] Where to read ksyms [-K] No ksyms is available [-m system.map] Where to read System.map [-M] No System.map is available [-s save.map] Save consolidated map [-d] Increase debug level by 1 [-h] Print help text Oops.file Oops to decode
All flags can occur more than once. With the exception of -o and -d which are cumulative, the last occurrence of each flag is used. Note that "-v my.vmlinux -V" will be taken as "No vmlinux available" but "-V -v my.vmlinux" will read my.vmlinux. You will be warned about such combinations.
Each occurrence of -d increases the debug level.
Each -o flag can refer to a directory or to a single object file. If a directory is specified then all *.o files in that directory and its subdirectories are assumed to be modules.
Defaults: -v /usr/src/linux/vmlinux -o /lib/modules/`uname -r` -k /proc/ksyms -m /usr/src/linux/System.map Oops report is read from stdin
Note: Unless you tell ksymoops *NOT* to read a particular file, it will try to read and reconcile all possible sources of kernel symbol information. This is intended for beginners, they just type
ksymoops < /var/log/syslog
no thinking required. Experts can point at different files or suppress the input from selected files. For example, if you save /proc/ksyms before doing a test that creates an Oops, you can point ksymoops at the saved ksyms instead of using /proc/ksyms.
To get the equivalent of the old ksymoops.c (no vmlinux, no modules objects, no ksyms, no System.map) just do ksymoops -VOKM. Or to just read System.map, ksymoops -VOK -m mapfile.
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