------- Additional Comments From ro at TechFak dot Uni-Bielefeld dot DE
2008-11-11 22:37 -------
Subject: Re: New: ld is unable to link 32 bit libffi.so on gcc mainline:
Memory exhausted
Some additional investigation revealed the following:
* bfd_set_error (bfd_error_no_memory) is called here:
#0 bfd_set_error (error_tag=bfd_error_no_memory) at
/vol/gnu/src/binutils/binutils-2.19/bfd/bfd.c:425
#1 0x00046e20 in bfd_malloc2 (nmemb=4294967295, size=68719476720) at
/vol/gnu/src/binutils/binutils-2.19/bfd/libbfd.c:199
#2 0x00064968 in bfd_elf_get_elf_syms (ibfd=0x15c8b0, symtab_hdr=0x0,
symcount=4294967295, symoffset=1, intsym_buf=0x0, extsym_buf=0x0,
extshndx_buf=0x0) at /vol/gnu/src/binutils/binutils-2.19/bfd/elf.c:390
#3 0x00078164 in bfd_elf_link_add_symbols (abfd=0x15c8b0, info=0x122920) at
/vol/gnu/src/binutils/binutils-2.19/bfd/elflink.c:3666
#4 0x00027638 in load_symbols (entry=0x1230b0, place=0xffbff240) at
/vol/gnu/src/binutils/binutils-2.19/ld/ldlang.c:2573
#5 0x000280dc in open_input_bfds (s=0x1230b0, force=0) at
/vol/gnu/src/binutils/binutils-2.19/ld/ldlang.c:3002
#6 0x0002dd60 in lang_process () at
/vol/gnu/src/binutils/binutils-2.19/ld/ldlang.c:6073
#7 0x000306f4 in main (argc=34, argv=0xffbff3d4) at
/vol/gnu/src/binutils/binutils-2.19/ld/ldmain.c:453
* bfd_elf_get_elf_syms is called with symcount = -1L, which leads to the
allocation failure observed
* That value of symcount is computed in bfd/elflink.c
(elf_link_add_object_symbols): at line 3674 (current binutils mainline)
symcount =0, hdr->sh_info = 1 -> extsymcount = -1LL
hdr is like this at this point:
(gdb) p hdr
$6 = (Elf_Internal_Shdr *) 0x213d00
(gdb) p *$6
$7 = {sh_name = 11, sh_type = 2, sh_flags = 2, sh_addr = 0, sh_offset = 88,
sh_size = 0, sh_link = 3, sh_info = 1, sh_addralign = 1, sh_entsize = 16,
bfd_section = 0x0, contents = 0x0}
further investigation with readelf gives:
% readelf -S src/sparc/.libs/v9.o
There are 5 section headers, starting at offset 0x94:
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf Al
[ 0] NULL 00000000 000000 000000 00 0 0 0
[ 1] .shstrtab STRTAB 00000000 000034 000024 00 0 0 1
[ 2] .symtab SYMTAB 00000000 000058 000000 10 A 3 1 1
[ 3] .strtab STRTAB 00000000 000058 000001 00 A 0 0 1
[ 4] .comment PROGBITS 00000000 000059 00003b 00 0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings)
I (info), L (link order), G (group), x (unknown)
O (extra OS processing required) o (OS specific), p (processor specific)
I'm not sure how best to fix this: the following hack worked for me:
Index: bfd/elflink.c
===================================================================
RCS file: /cvs/src/src/bfd/elflink.c,v
retrieving revision 1.315
diff -u -p -r1.315 elflink.c
--- bfd/elflink.c 20 Oct 2008 10:57:33 -0000 1.315
+++ bfd/elflink.c 11 Nov 2008 22:32:25 -0000
@@ -3671,7 +3671,10 @@ elf_link_add_object_symbols (bfd *abfd,
}
else
{
- extsymcount = symcount - hdr->sh_info;
+ if (symcount > 0)
+ extsymcount = symcount - hdr->sh_info;
+ else
+ extsymcount = symcount;
extsymoff = hdr->sh_info;
}
--
http://sourceware.org/bugzilla/show_bug.cgi?id=7023
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