https://sourceware.org/bugzilla/show_bug.cgi?id=17226
Bug ID: 17226
Summary: ld --gc-sections segfaults on sparc-linux
Product: binutils
Version: 2.25 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: mikpelinux at gmail dot com
Created attachment 7737
--> https://sourceware.org/bugzilla/attachment.cgi?id=7737&action=edit
gcsec-1.s from GCC's testsuite
GCC's gcc/testsuite/gcc.dg/special/gcsec-1.c fails on sparc-linux because it
causes ld to segfault. This is reproducible both natively on sparc-linux and
with cross toolchains hosted on x86_64-linux. Occurs with (at least) binutils
2.25 (HEAD), 2.24, and 2.23.2. Occurs with both 32 and 64-bit sparc targets.
To reproduce natively on sparc-linux, do sth like:
> gcc -m32 -c gcsec-1.s
> ld -m elf32_sparc -static -relax -o a.out /usr/lib/crt1.o /usr/lib/crti.o
> /usr/lib/gcc/sparcv9-brewer-linux/4.7.4/crtbeginT.o gcsec-1.o --gc-sections
> --start-group /usr/lib/libc.a
> /usr/lib/gcc/sparcv9-brewer-linux/4.7.4/libgcc.a
> /usr/lib/gcc/sparcv9-brewer-linux/4.7.4/libgcc_eh.a --end-group
> /usr/lib/gcc/sparcv9-brewer-linux/4.7.4/crtend.o /usr/lib/crtn.o
Segmentation fault
Running the above in gdb shows:
Program received signal SIGSEGV, Segmentation fault.
0xf7f2ec2c in _bfd_sparc_elf_gc_sweep_hook (abfd=0x15ce98, info=0x9bc28
<link_info>, sec=0x16f418, relocs=<optimized out>) at elfxx-sparc.c:2003
2003 if (local_got_refcounts[r_symndx] > 0)
Missing separate debuginfos, use: debuginfo-install
glibc-2.17-2.bl17.bl.2.sparcv9 libgcc-4.7.4-10.bl17.bl.2.sparcv9
zlib-1.2.5-7.bl17.sparcv9
(gdb) list
1998 case R_SPARC_GOTDATA_OP_HIX22:
1999 case R_SPARC_GOTDATA_OP_LOX10:
2000 break;
2001
2002 default:
2003 if (local_got_refcounts[r_symndx] > 0)
2004 local_got_refcounts[r_symndx]--;
2005 break;
2006 }
2007 }
(gdb) bt
#0 0xf7f2ec2c in _bfd_sparc_elf_gc_sweep_hook (abfd=0x15ce98, info=0x9bc28
<link_info>, sec=0x16f418, relocs=<optimized out>) at elfxx-sparc.c:2003
#1 0xf7f5e264 in elf_gc_sweep (info=0x9bc28 <link_info>, abfd=0xa9618) at
elflink.c:11936
#2 bfd_elf_gc_sections (abfd=0xa9618, info=0x9bc28 <link_info>) at
elflink.c:12199
#3 0x00028e58 in lang_gc_sections () at ldlang.c:6401
#4 lang_process () at ldlang.c:6744
#5 0x00013b04 in main (argc=19, argv=0xffffd2b4) at ./ldmain.c:386
(gdb) print local_got_refcounts
$1 = (bfd_signed_vma *) 0x0
Removing the --gc-sections option allows the link to succeed.
To reproduce with a cross toolchain, do sth like:
> sparc64-unknown-linux-gcc -m32 -c gcsec-1.s
> sparc64-unknown-linux-ld -m elf32_sparc -static -relax -o a.out
> /home/mikpe/pkgs/linux-x86_64/cross-sparc64/usr/lib/crt1.o
> /home/mikpe/pkgs/linux-x86_64/cross-sparc64/usr/lib/crti.o
> /home/mikpe/pkgs/linux-x86_64/cross-sparc64/lib/gcc/sparc64-unknown-linux/4.8.3/32/crtbeginT.o
> gcsec-1.o --gc-sections --start-group
> /home/mikpe/pkgs/linux-x86_64/cross-sparc64/usr/lib/libc.a
> /home/mikpe/pkgs/linux-x86_64/cross-sparc64/lib/gcc/sparc64-unknown-linux/4.8.3/32/libgcc.a
> --end-group
> /home/mikpe/pkgs/linux-x86_64/cross-sparc64/lib/gcc/sparc64-unknown-linux/4.8.3/32/crtend.o
> /home/mikpe/pkgs/linux-x86_64/cross-sparc64/usr/lib/crtn.o
Segmentation fault
The cross toolchain was built with binutils-2.24, gcc-4.8.3, Linux 3.13 kernel
headers, and glibc-2.19.
I've tried to make the test case standalone, but simply stubbing out the
references to libc makes the segfault go away.
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