http://sourceware.org/bugzilla/show_bug.cgi?id=15382
Bug #: 15382
Summary: ld segfaults with .debug_types sections
Product: binutils
Version: 2.23
Status: NEW
Severity: normal
Priority: P2
Component: ld
AssignedTo: unassig...@sourceware.org
ReportedBy: jan.sm...@alcatel-lucent.com
Classification: Unclassified
The segfault happens in 2.23.2.
Starting program: ld -m elf64btsmip -X -N -r --fatal-warnings -o ../lib/x.a
/tmp/a.o /tmp/b.o
Program received signal SIGSEGV, Segmentation fault.
elf_link_input_bfd (input_bfd=0xc109d0, flinfo=0x7fffffffd430) at
elflink.c:9771
9771 irela->r_info = 0;
(gdb) bt
#0 elf_link_input_bfd (input_bfd=0xc109d0, flinfo=0x7fffffffd430) at
elflink.c:9771
#1 bfd_elf_final_link (abfd=0x7767f0, info=0x7603e0 <link_info>) at
elflink.c:10852
#2 0x0000000000458834 in _bfd_mips_elf_final_link (abfd=<optimized out>,
info=0x7603e0 <link_info>) at elfxx-mips.c:13571
#3 0x000000000041766b in ldwrite () at ldwrite.c:582
#4 0x000000000041656a in main (argc=11, argv=0x7fffffffdd88) at ./ldmain.c:420
(gdb) p /x irela
$27 = 0x7ffff1790ff8
(gdb) p /x *irela
$8 = {
r_offset = 0xffffffffffffffff,
r_info = 0xde020109,
r_addend = 0x2d900000038
}
elflink.c in 2.23.2
9763 if (irela->r_offset >= (bfd_vma) -2)
9764 {
9765 /* This is a reloc for a deleted entry or somesuch.
9766 Turn it into an R_*_NONE reloc, at the same
9767 offset as the last reloc. elf_eh_frame.c and
9768 bfd_elf_discard_info rely on reloc offsets
9769 being ordered. */
9770 irela->r_offset = last_offset;
9771 irela->r_info = 0;
9772 irela->r_addend = 0;
9773 continue;
9774 }
The key difference between crashing/asserting and working just fine is that I
have enabled debugging. Dwarf-4 debug symbols where each type is placed into
its own .debug_types section. I'm using GCC 4.6.
In binutils 2.22 there is an assert at
ld: BFD (GNU Binutils) 2.22 assertion fail elf64-mips.c:2521
ld: BFD (GNU Binutils) 2.22 assertion fail elf64-mips.c:2522
ld: BFD (GNU Binutils) 2.22 assertion fail elf64-mips.c:2527
ld: BFD (GNU Binutils) 2.22 assertion fail elf64-mips.c:2528
2512 /* Swap out a MIPS 64-bit Rela reloc. */
2513
2514 static void
2515 mips_elf64_be_swap_reloca_out (bfd *abfd, const Elf_Internal_Rela *src,
2516 bfd_byte *dst)
2517 {
2518 Elf64_Mips_Internal_Rela mirela;
2519
2520 mirela.r_offset = src[0].r_offset;
2521 BFD_ASSERT(src[0].r_offset == src[1].r_offset);
2522 BFD_ASSERT(src[0].r_offset == src[2].r_offset);
2523
2524 mirela.r_type = ELF64_MIPS_R_TYPE (src[0].r_info);
2525 mirela.r_sym = ELF64_R_SYM (src[0].r_info);
2526 mirela.r_addend = src[0].r_addend;
2527 BFD_ASSERT(src[1].r_addend == 0);
2528 BFD_ASSERT(src[2].r_addend == 0);
2529
2530 mirela.r_type2 = ELF64_MIPS_R_TYPE (src[1].r_info);
2531 mirela.r_ssym = ELF64_MIPS_R_SSYM (src[1].r_info);
2532 mirela.r_type3 = ELF64_MIPS_R_TYPE (src[2].r_info);
2533
2534 mips_elf64_swap_reloca_out (abfd, &mirela,
2535 (Elf64_Mips_External_Rela *) dst);
2536 }
Unfortunately this bug is preventing me to roll out a new debugging
infrastructure. Thank you for your help.
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