Description of problem:
Segfault trying to run eu-readelf i386 on an s390x binary.

Version-Release number of selected component (if applicable):
elfutils-0.125-3.el5.i386, running on this OS:
Linux dhcp-100-3-213.bos.redhat.com 2.6.18-8.el5xen #1 SMP Fri Jan 26 14:42:21
EST 2007 i686 i686 i386 GNU/Linux
(although the hardware is x86_64)

How reproducible:
100% for me

Steps to Reproduce:
1. Extract s390x payload thus:
mkdir payload; (cd payload; rpm2cpio ../krb5-1.6.1-17.el5.s390x | cpio -i -d )
2. gdb eu-readelf
3. (gdb) set args -d payload/usr/kerberos/sbin/krb5kdc
4. (gdb) run
Starting program: /usr/bin/eu-readelf -d payload/usr/kerberos/sbin/krb5kdc

Program received signal SIGSEGV, Segmentation fault.
0x44d8259e in elf64_offscn (elf=0x9c6e850, offset=102576) at elf32_offscn.c:89
89              if (runp->data[i].shdr.ELFW(e,LIBELFBITS)->sh_offset == offset)
(gdb) bt
#0  0x44d8259e in elf64_offscn (elf=0x9c6e850, offset=102576) at elf32_offscn.c:89
#1  0x44d82631 in gelf_offscn (elf=0x0, offset=102576) at gelf_offscn.c:77
#2  0x0804b577 in print_dynamic (ebl=0x9c6f4f8, ehdr=0xbfefbbe0) at readelf.c:1267
#3  0x08053a82 in process_elf_file (elf=0x9c6e850, prefix=0x0, fname=<value
optimized out>, only_one=true) at readelf.c:493
#4  0x08054755 in process_file (fd=6, elf=0x9c6e850, prefix=0x0, 
    fname=0xbfefd869 "payload/usr/kerberos/sbin/krb5kdc", only_one=true) at
readelf.c:390
#5  0x080548d3 in main (argc=3, argv=0xbfefbde4) at readelf.c:226
#6  0x467d3dec in __libc_start_main () from /lib/i686/nosegneg/libc.so.6
#7  0x08049c21 in _start ()
(gdb) p runp
$1 = (Elf_ScnList *) 0x926f8ec
(gdb) p runp->data
$2 = 0x926f8f8
(gdb) p i
$3 = 0
(gdb) p runp->data[i]
$4 = {data_list = {data = {d = {d_buf = 0x0, d_type = ELF_T_BYTE, d_version = 0,
d_size = 0, d_off = 0, d_align = 0}, s = 0x0}, next = 0x0, flags = 0}, 
  data_list_rear = 0x0, rawdata = {d = {d_buf = 0x0, d_type = ELF_T_BYTE,
d_version = 0, d_size = 0, d_off = 0, d_align = 0}, s = 0x0}, data_read = 0, 
  index = 0, elf = 0x926f850, shdr = {e32 = 0x0, e64 = 0x0}, shdr_flags = 0,
flags = 0, rawdata_base = 0x0, data_base = 0x0, list = 0x926f8ec}
(gdb) p runp->data[i].shdr
$5 = {e32 = 0x0, e64 = 0x0}
(gdb) p runp->data[i].shdr.ELFW(e, LIBELFBITS)
No symbol "e" in current context.