5aea50b5c7
We're struggling all the time to figure out where the code came from that
oopsed.. The script below (a adaption from a script used by
kerneloops.org) can help developers quite a bit, at least for non-module
cases.
It works and looks like this:
[/home/arjan/linux]$ dmesg | perl scripts/markup_oops.pl vmlinux
{
struct agp_memory *memory;
memory = agp_allocate_memory(agp_bridge, pg_count, type);
c055c10f: 89 c2 mov %eax,%edx
if (memory == NULL)
c055c111: 74 19 je c055c12c <agp_allocate_memory_wrap+0x30>
/* This function must only be called when current_controller != NULL */
static void agp_insert_into_pool(struct agp_memory * temp)
{
struct agp_memory *prev;
prev = agp_fe.current_controller->pool;
c055c113: a1 ec dc 8f c0 mov 0xc08fdcec,%eax
*c055c118: 8b 40 10 mov 0x10(%eax),%eax <----- faulting instruction
if (prev != NULL) {
c055c11b: 85 c0 test %eax,%eax
c055c11d: 74 05 je c055c124 <agp_allocate_memory_wrap+0x28>
prev->prev = temp;
c055c11f: 89 50 04 mov %edx,0x4(%eax)
temp->next = prev;
c055c122: 89 02 mov %eax,(%edx)
}
agp_fe.current_controller->pool = temp;
c055c124: a1 ec dc 8f c0 mov 0xc08fdcec,%eax
c055c129: 89 50 10 mov %edx,0x10(%eax)
if (memory == NULL)
return NULL;
agp_insert_into_pool(memory);
so in this case, we faulted while dereferencing agp_fe.current_controller
pointer, and we get to see exactly which function and line it affects...
Personally I find this very useful, and I can see value for having this
script in the kernel for more-than-just-me to use.
Caveats:
* It only works for oopses not-in-modules
* It only works nicely for kernels compiled with CONFIG_DEBUG_INFO
* It's not very fast.
* It only works on x86
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
163 lines
2.8 KiB
Perl
163 lines
2.8 KiB
Perl
#!/usr/bin/perl -w
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# Copyright 2008, Intel Corporation
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#
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# This file is part of the Linux kernel
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#
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# This program file is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation; version 2 of the License.
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#
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# Authors:
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# Arjan van de Ven <arjan@linux.intel.com>
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my $vmlinux_name = $ARGV[0];
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#
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# Step 1: Parse the oops to find the EIP value
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#
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my $target = "0";
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while (<STDIN>) {
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if ($_ =~ /EIP: 0060:\[\<([a-z0-9]+)\>\]/) {
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$target = $1;
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}
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}
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if ($target =~ /^f8/) {
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print "This script does not work on modules ... \n";
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exit;
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}
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if ($target eq "0") {
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print "No oops found!\n";
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print "Usage: \n";
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print " dmesg | perl scripts/markup_oops.pl vmlinux\n";
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exit;
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}
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my $counter = 0;
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my $state = 0;
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my $center = 0;
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my @lines;
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sub InRange {
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my ($address, $target) = @_;
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my $ad = "0x".$address;
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my $ta = "0x".$target;
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my $delta = hex($ad) - hex($ta);
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if (($delta > -4096) && ($delta < 4096)) {
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return 1;
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}
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return 0;
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}
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# first, parse the input into the lines array, but to keep size down,
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# we only do this for 4Kb around the sweet spot
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my $filename;
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open(FILE, "objdump -dS $vmlinux_name |") || die "Cannot start objdump";
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while (<FILE>) {
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my $line = $_;
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chomp($line);
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if ($state == 0) {
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if ($line =~ /^([a-f0-9]+)\:/) {
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if (InRange($1, $target)) {
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$state = 1;
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}
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}
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} else {
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if ($line =~ /^([a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]+)\:/) {
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my $val = $1;
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if (!InRange($val, $target)) {
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last;
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}
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if ($val eq $target) {
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$center = $counter;
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}
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}
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$lines[$counter] = $line;
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$counter = $counter + 1;
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}
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}
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close(FILE);
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if ($counter == 0) {
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print "No matching code found \n";
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exit;
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}
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if ($center == 0) {
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print "No matching code found \n";
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exit;
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}
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my $start;
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my $finish;
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my $codelines = 0;
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my $binarylines = 0;
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# now we go up and down in the array to find how much we want to print
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$start = $center;
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while ($start > 1) {
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$start = $start - 1;
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my $line = $lines[$start];
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if ($line =~ /^([a-f0-9]+)\:/) {
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$binarylines = $binarylines + 1;
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} else {
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$codelines = $codelines + 1;
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}
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if ($codelines > 10) {
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last;
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}
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if ($binarylines > 20) {
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last;
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}
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}
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$finish = $center;
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$codelines = 0;
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$binarylines = 0;
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while ($finish < $counter) {
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$finish = $finish + 1;
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my $line = $lines[$finish];
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if ($line =~ /^([a-f0-9]+)\:/) {
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$binarylines = $binarylines + 1;
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} else {
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$codelines = $codelines + 1;
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}
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if ($codelines > 10) {
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last;
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}
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if ($binarylines > 20) {
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last;
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}
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}
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my $i;
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my $fulltext = "";
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$i = $start;
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while ($i < $finish) {
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if ($i == $center) {
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$fulltext = $fulltext . "*$lines[$i] <----- faulting instruction\n";
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} else {
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$fulltext = $fulltext . " $lines[$i]\n";
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}
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$i = $i +1;
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}
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print $fulltext;
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