gdb.threads/attach-stopped.exp fails

[Yao Qi]

FAIL: gdb.threads/attach-stopped.exp: threaded: attach2 to stopped bt

(gdb) PASS: gdb.threads/attach-stopped.exp: threaded: attach2 to stopped, after setting file
thread apply all bt^M
^M
Thread 2 (Thread 0x403b8470 (LWP 7203)):^M
#0 0x401373c4 in nanosleep () from /lib/libc.so.6^M
#1 0x4016a122 in ?? () from /lib/libc.so.6^M
#2 0x4016a122 in ?? () from /lib/libc.so.6^M
Backtrace stopped: previous frame identical to this frame (corrupt stack?)^M
^M
Thread 1 (Thread 0x40019af0 (LWP 7202)):^M
#0 0x40041fc6 in __libc_do_syscall () from /lib/libpthread.so.0^M
#1 0x4003a3e2 in pthread_join () from /lib/libpthread.so.0^M
#2 0x000084b8 in main () at ../../../gdb/gdb/testsuite/gdb.threads/attach-stopped.c:45^M
(gdb) FAIL: gdb.threads/attach-stopped.exp: threaded: attach2 to stopped bt

Looks like related to stack backtrace. Further analysis is needed.

[Ulrich Weigand (uweigand)]

This problem does not occur if debug/symbol information for glibc is installed.

Note that even without debuginfo, this problem is fixed with the proposed patch to use ARM unwind data (LP #661253).