[Bug gdb/27908] FAIL: gdb.base/run-attach-while-running.exp: threaded=1: run-or-attach=attach: non-stop=on: test: attach to process (timeout)

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27908

--- Comment #4 from Tom de Vries <vries at gcc dot gnu.org> ---
Using this trick:
...
$ git diff
diff --git a/gdb/testsuite/gdb.base/run-attach-while-running.exp
b/gdb/testsuite/gdb.base/r
un-attach-while-running.exp
index 7c16aa6f5c4..230ad66ee73 100644
--- a/gdb/testsuite/gdb.base/run-attach-while-running.exp
+++ b/gdb/testsuite/gdb.base/run-attach-while-running.exp
@@ -93,6 +93,8 @@ proc_with_prefix test { non-stop threaded run-or-attach } {

        gdb_test "attach $test_pid" "Attaching to program: .*" "attach to
process"

+       gdb_test "echo bla\\n"
+
        gdb_exit
        kill_wait_spawned_process $test_spawn_id
     } else {
...
we can see the extra message in the PASS case as well:
...
Reading symbols from
/usr/lib/debug/lib64/ld-2.26.so-2.26-lp152.26.6.1.x86_64.debug...^M
0x00007f5eeb0554c0 in __GI___nanosleep
(requested_time=requested_time@entry=0x7fff7b78a1c0,
remaining=remaining@entry=0x7fff7b78a1c0) at
../sysdeps/unix/sysv/linux/nanosleep.c:27^M
27        return SYSCALL_CANCEL (nanosleep, requested_time, remaining);^M
(gdb) PASS: gdb.base/run-attach-while-running.exp: threaded=1:
run-or-attach=attach: non-stop=on: test: attach to process
^M
Thread 2 "run-attach-whil" stopped.^M
0x00007f5eeb0554c0 in __GI___nanosleep
(requested_time=requested_time@entry=0x7f5eeaf8aea0,
remaining=remaining@entry=0x7f5eeaf8aea0) at
../sysdeps/unix/sysv/linux/nanosleep.c:27^M
27        return SYSCALL_CANCEL (nanosleep, requested_time, remaining);^M
echo bla\n^M
bla^M
(gdb) PASS: gdb.base/run-attach-while-running.exp: threaded=1:
run-or-attach=attach: non-stop=on: test: echo bla\n
...

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