https://sourceware.org/bugzilla/show_bug.cgi?id=25034
Bug ID: 25034
Summary: gold creates incorrect executable with large arrays
Product: binutils
Version: 2.32
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gold
Assignee: ccoutant at gmail dot com
Reporter: greened at obbligato dot org
CC: ian at airs dot com
Target Milestone: ---
$ cat big.c
#include <stdio.h>
struct {
double a[512][512][512];
double b[512][512][512];
double c[512][512][512];
} bigarrays;
int x;
int main(void) {
printf("&a: 0x%016x\n", bigarrays.a);
printf("&b: 0x%016x\n", bigarrays.b);
printf("&c: 0x%016x\n", bigarrays.c);
printf("&x: 0x%016x\n", &x);
x = 20;
int i = 0;
int j = 0;
int k = 0;
for (k = 0; k < 512; ++k) {
for (j = 0; j < 512; ++j) {
for (i = 0; i < 512; ++i) {
bigarrays.a[k][j][i] = 0.0;
bigarrays.b[k][j][i] = 0.0;
bigarrays.c[k][j][i] = 0.0;
}
}
}
printf("x: %d\n", x);
return 0;
}
$ gcc -fPIC big.c -Wl,--no-relax -o big.bfd
$ ./big.bfd
&a: 0x0000000000404080
&b: 0x0000000040404080
&c: 0x0000000080404080
&x: 0x0000000000404060
x: 20
$ gcc -fuse-ld=gold -fPIC big.c -o big.gold
$ ./big.gold
&a: 0x0000000000402060
&b: 0x0000000040402060
&c: 0x0000000080402060
&x: 0x00000000c0402060
Segmentation fault
$ ld --version
GNU ld (GNU Binutils) 2.32
Copyright (C) 2019 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or (at your option) a later version.
This program has absolutely no warranty.
$ ld.gold --version
GNU gold (GNU Binutils 2.32) 1.16
Copyright (C) 2019 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or (at your option) a later version.
This program has absolutely no warranty.
gdb shows the fault here:
0x0000000000400610 <+126>: lea -0x3fffe5b7(%rip),%rax #
0xffffffffc0402060
=> 0x0000000000400617 <+133>: movl $0x14,(%rax)
That offset looks like a relocation overflow. Is gold trying to relax the
reference and doing it incorrectly? `--no-relax` doesn't help. The code looks
the same with and without the option.
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