[Bug ld/30155] New: ld: Segfault in _bfd_nearby_section with custom linker scripts

[acoplan at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=30155

            Bug ID: 30155
           Summary: ld: Segfault in _bfd_nearby_section with custom linker
                    scripts
           Product: binutils
           Version: 2.41 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: acoplan at gcc dot gnu.org
  Target Milestone: ---

The following fails:

$ cat t1.ld
SECTIONS {
   a : {
     b = .;
  }
}
INSERT BEFORE .text.start
$ cat t2.ld
SECTIONS {
  a = .;
  .text.start 0 : { c = .; }
}
$ echo nop | aarch64-none-elf-as -o t.o
$ aarch64-none-elf-ld --version
GNU ld (GNU Binutils) 2.40.50.20230222
Copyright (C) 2023 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.
$ aarch64-none-elf-ld t.o -T t1.ld -T t2.ld
Segmentation fault (core dumped)

Looking in GDB the backtrace is as follows:

(gdb) r
Starting program: /data_sdb/toolchain/bu/dbg-aarch64/bin/aarch64-none-elf-ld
t.o -T t1.ld -T t2.ld

Program received signal SIGSEGV, Segmentation fault.
0x00005555555e33a8 in _bfd_nearby_section (obfd=0x5555559fa4c0,
s=0x5555559eed90 <_bfd_std_section+560>, addr=0) at
/home/alecop01/toolchain/src/binutils-gdb/bfd/linker.c:2986
2986        next = s->owner->sections;
(gdb) bt
#0  0x00005555555e33a8 in _bfd_nearby_section (obfd=0x5555559fa4c0,
s=0x5555559eed90 <_bfd_std_section+560>, addr=0) at
/home/alecop01/toolchain/src/binutils-gdb/bfd/linker.c:2986
#1  0x00005555555e35fa in fix_syms (h=0x555555a067e0, data=0x5555559fa4c0) at
/home/alecop01/toolchain/src/binutils-gdb/bfd/linker.c:3056
#2  0x00005555555df598 in bfd_link_hash_traverse (htab=0x5555559fc850,
func=0x5555555e3522 <fix_syms>, info=0x5555559fa4c0) at
/home/alecop01/toolchain/src/binutils-gdb/bfd/linker.c:671
#3  0x00005555555e3657 in _bfd_fix_excluded_sec_syms (obfd=0x5555559fa4c0,
info=0x5555559f3980 <link_info>) at
/home/alecop01/toolchain/src/binutils-gdb/bfd/linker.c:3068
#4  0x00005555555b48f9 in finish_default () at
/home/alecop01/toolchain/src/binutils-gdb/ld/ldemul.c:303
#5  0x00005555555bcad5 in gldaarch64elf_finish () at eaarch64elf.c:325
#6  0x00005555555b43db in ldemul_finish () at
/home/alecop01/toolchain/src/binutils-gdb/ld/ldemul.c:108
#7  0x00005555555a8909 in lang_process () at
/home/alecop01/toolchain/src/binutils-gdb/ld/ldlang.c:8206
#8  0x00005555555ad42c in main (argc=6, argv=0x7fffffffbe68) at
/home/alecop01/toolchain/src/binutils-gdb/ld/ldmain.c:501

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