Red Hat Bugzilla – Bug 235747
linker segfault with MALLOC_PERTURB
Last modified: 2015-01-04 17:29:41 EST
whilst building a kernel, the final stage of the linking segfaults.. WARNING: vmlinux - Section mismatch: reference to .init.text: from .text between 'iret_exc' (at offset 0xc120eaac) and '_etext' LD arch/i386/boot/compressed/piggy.o /bin/sh: line 1: 4049 Segmentation fault (core dumped) ld -m elf_i386 -m elf_i386 -r --format binary --oformat elf32-i386 -T arch/i386/boot/compressed/vmlinux.scr arch/i386/boot/compressed/vmlinux.bin.gz -o arch/i386/boot/compressed/piggy.o make[2]: *** [arch/i386/boot/compressed/piggy.o] Error 139 make[1]: *** [arch/i386/boot/compressed/vmlinux] Error 2 make: *** [bzImage] Error 2 gdb on the core shows.. Core was generated by `ld -m elf_i386 -m elf_i386 -r --format binary --oformat elf32-i386 -T arch/i386'. Program terminated with signal 11, Segmentation fault. #0 0x401291cc in free () from /lib/libc.so.6 (gdb) bt #0 0x401291cc in free () from /lib/libc.so.6 #1 0x400750db in bfd_elf_final_link (abfd=0x8cf1a20, info=0x80a3b00) at bfd/elflink.c:8900 #2 0x0805ee7a in ldwrite () at ld/ldwrite.c:557 #3 0x0805e2c2 in main (argc=147800232, argv=0xd58) at ld/ldmain.c:527 #4 0x400d3ef0 in __libc_start_main () from /lib/libc.so.6 #5 0x0804ab01 in _start () unsetting MALLOC_PERTURB makes it 'behave', though obviously it's just making it non-fatal.
Which exact kernel nvr was that and what was MALLOC_PERTURB value you reproduced it with?
that was a git clone from linus' tree from 2 days ago. MALLOC_PERTURB was 30 something (38 I think) to begin with, but it was reproducable with many others (my .bashrc sets it to $RANDOM, and I had this happen in multiple terminals).
I tried MALLOC_PERTURB_=136 mock -r fedora-devel-i386-core --arch=i686 kernel-2.6.20-1.3054.fc7.src.rpm today and that didn't reproduce this for me. Could you please tar the above files in question for me, so that I can just run ld to reproduce it? arch/i386/boot/compressed/vmlinux.scr and arch/i386/boot/compressed/vmlinux.bin.gz should be hopefully all that is needed (unless vmlinux.scr includes other linker scripts).
Reproduced, thanks.
http://sources.redhat.com/ml/binutils/2007-04/msg00187.html
Should be fixed in binutils-2.17.50.0.12-4 in rawhide.