Re: [2.4.17] net/network.o(.text.lock+0x1a88): undefined reference to `local symbols...

From: Keith Owens (kaos@ocs.com.au)
Date: Sun Dec 23 2001 - 00:18:39 EST


On Sat, 22 Dec 2001 22:22:13 -0500,
nveber@pyre.virge.net (Norbert Veber) wrote:
>net/network.o(.text.lock+0x1a88): undefined reference to `local symbols in discarded section .text.exit'

Got bored, wrote some Perl (Oh hang on, I've used that before).

net/network.o is not much help, it is a conglomerate object. I need
the individual object that is failing. cd linux and run
reference_discarded.pl below.

Any other patches applied?

#!/usr/bin/perl -w
#
# reference_discarded.pl (C) Keith Owens 2001 <kaos@ocs.com.au>
#
# List dangling references to vmlinux discarded sections.

use strict;
die($0 . " takes no arguments\n") if($#ARGV >= 0);

my %object;
my $object;
my $line;
my $ignore;

$| = 1;

printf("Finding objects, ");
open(OBJDUMP_LIST, "find . -name '*.o' | xargs objdump -h |") || die "getting objdump list failed";
while (defined($line = <OBJDUMP_LIST>)) {
        chomp($line);
        if ($line =~ /:\s+file format/) {
                ($object = $line) =~ s/:.*//;
                $object{$object}->{'module'} = 0;
                $object{$object}->{'size'} = 0;
                $object{$object}->{'off'} = 0;
        }
        if ($line =~ /^\s*\d+\s+\.modinfo\s+/) {
                $object{$object}->{'module'} = 1;
        }
        if ($line =~ /^\s*\d+\s+\.comment\s+/) {
                ($object{$object}->{'size'}, $object{$object}->{'off'}) = (split(' ', $line))[2,5];
        }
}
close(OBJDUMP_LIST);
printf("%d objects, ", scalar keys(%object));
$ignore = 0;
foreach $object (keys(%object)) {
        if ($object{$object}->{'module'}) {
                ++$ignore;
                delete($object{$object});
        }
}
printf("ignoring %d module(s)\n", $ignore);

# Ignore conglomerate objects, they have been built from multiple objects and we
# only care about the individual objects. If an object has more than one GCC:
# string in the comment section then it is conglomerate. This does not filter
# out conglomerates that consist of exactly one object, can't be helped.

printf("Finding conglomerates, ");
$ignore = 0;
foreach $object (keys(%object)) {
        if (exists($object{$object}->{'off'})) {
                my ($off, $size, $comment, $l);
                $off = hex($object{$object}->{'off'});
                $size = hex($object{$object}->{'size'});
                open(OBJECT, "<$object") || die "cannot read $object";
                seek(OBJECT, $off, 0) || die "seek to $off in $object failed";
                $l = read(OBJECT, $comment, $size);
                die "read $size bytes from $object .comment failed" if ($l != $size);
                close(OBJECT);
                if ($comment =~ /GCC\:.*GCC\:/m) {
                        ++$ignore;
                        delete($object{$object});
                }
        }
}
printf("ignoring %d conglomerate(s)\n", $ignore);

printf("Scanning objects\n");
foreach $object (keys(%object)) {
        my $from;
        open(OBJDUMP, "objdump -r $object|") || die "cannot objdump -r $object";
        while (defined($line = <OBJDUMP>)) {
                chomp($line);
                if ($line =~ /RELOCATION RECORDS FOR /) {
                        ($from = $line) =~ s/.*\[([^]]*).*/$1/;
                }
                if (($line =~ /\.text\.exit$/ ||
                     $line =~ /\.data\.exit$/ ||
                     $line =~ /\.exitcall\.exit$/) &&
                    ($from !~ /\.text\.exit$/ &&
                     $from !~ /\.data\.exit$/ &&
                     $from !~ /\.exitcall\.exit$/)) {
                        printf("Error: %s %s refers to %s\n", $object, $from, $line);
                }
        }
        close(OBJDUMP);
}
printf("Done\n");

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