[Bug gdb/17968] [ppc64] SEGV in ppc64_elf_get_synthetic_symtab reading a separate debug file

["msebor at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17968

--- Comment #1 from Martin Sebor <msebor at redhat dot com> ---
The following test case reduced from a build of the kernel module in the
problem Description reproduces the SEGV with the top of trunk.  Tthough the
program faults in a different function, Valgrind reports the same Invalid read.

$ set -x && cat t.c && gcc -c -g t.c && cat t.lds && ld -r -T t.lds --build-id
-o t.ko t.o && cp t.ko t.sym.ko && objcopy --only-keep-debug t.ko t.ko.debug &&
strip --strip-debug t.ko && objcopy --add-gnu-debuglink=t.ko.debug t.ko &&
/build/gdb-fsf/gdb/gdb -q -batch t.sym.ko && /build/gdb-fsf/gdb/gdb -q -batch
t.ko; set +x
+ cat t.c
void foo (void) __attribute__ ((section (".bar")));
void foo (void) { }

+ gcc -c -g t.c
+ cat t.lds
SECTIONS {
  .foobar : { *(.bar) }
}
+ ld -r -T t.lds --build-id -o t.ko t.o
+ cp t.ko t.sym.ko
+ objcopy --only-keep-debug t.ko t.ko.debug
+ strip --strip-debug t.ko
+ objcopy --add-gnu-debuglink=t.ko.debug t.ko
+ /build/gdb-fsf/gdb/gdb -q -batch t.sym.ko
+ /build/gdb-fsf/gdb/gdb -q -batch t.ko
Segmentation fault

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