On Mon, Sep 28, 2009 at 11:34:06PM -0400, Daniel Kahn Gillmor wrote: > Package: libc6 > Version: 2.9-25 > Severity: normal > > I'm running alsaplayer on an armel platform, using the -text frontend > and the -alsa output. I've configured my armel machine to send a SIGBUS > to any process which makes an alignment error by doing this: > > echo 5 > /proc/cpu/alignment > > when i launch the player (compiled with debug symbols), even before it > gets to main() i get the SIGBUS. > > Here's the backtrace i see with libc6-dbg installed: > > (gdb) bt > #0 elf_machine_rel (scope=0x4001e1a0, lazy=1, consider_profiling=0) at > ../ports/sysdeps/arm/dl-machine.h:429 > #1 elf_dynamic_do_rel (scope=0x4001e1a0, lazy=1, consider_profiling=0) at > do-rel.h:120 > #2 _dl_relocate_object (scope=0x4001e1a0, lazy=1, consider_profiling=0) at > dl-reloc.c:266 > #3 0x400039bc in dl_main (phdr=0x8034, phnum=8, user_entry=0xbe98257c) at > rtld.c:2231 > #4 0x40015110 in _dl_sysdep_start (start_argptr=<value optimized out>, > dl_main=0x400021d8 <dl_main>) at ../elf/dl-sysdep.c:239 > #5 0x40000cd0 in _dl_start_final (arg=0xbe982870, info=0xbe9825f8) at > rtld.c:332 > #6 0x40000f68 in _dl_start (arg=0xbe982870) at rtld.c:560 > #7 0x400007f0 in _start () from /lib/ld-linux.so.3 > #8 0x400007f0 in _start () from /lib/ld-linux.so.3 > Backtrace stopped: previous frame identical to this frame (corrupt stack?) > (gdb) > > that last line is just: > > *reloc_addr += value > > but reloc_addr is optimized out. >
The problem is most probably a non word aligned relocation in the program you are trying to run or one of its library. You can list them with objdump -R file. -- Aurelien Jarno GPG: 1024D/F1BCDB73 aurel...@aurel32.net http://www.aurel32.net -- To UNSUBSCRIBE, email to debian-gcc-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
