[Bug tools/23673] TEST ./tests/backtrace-dwarf fails on s390x in at least 0.173

["mliska at suse dot cz" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23673

--- Comment #9 from Martin Liska <mliska at suse dot cz> ---
Hm, on x86_64 (on trunk) I see all tests OK, but:

$ ./backtrace-dwarf 
backtrace-dwarf: backtrace-dwarf.c:146: main: Assertion `errno == 0' failed.
0x7ffff7a4f08b  raise
0x7ffff7a384e9  abort
0x7ffff7a383c1  __assert_fail_base.cold.0
0x7ffff7a476f2  __assert_fail
0x40135a        main

which should not happen. On my machine I see errno == 2.

I would expect the test will fail with:

diff --git a/tests/backtrace-dwarf.c b/tests/backtrace-dwarf.c
index e1eb4928..273d2b5e 100644
--- a/tests/backtrace-dwarf.c
+++ b/tests/backtrace-dwarf.c
@@ -143,8 +143,8 @@ main (int argc __attribute__ ((unused)), char **argv)
       abort ();
     case 0:;
       long l = ptrace (PTRACE_TRACEME, 0, NULL, NULL);
-      assert (errno == 0);
-      assert (l == 0);
+      if (errno != 0 || l != 0)
+        return -1;
       cleanup_13_main ();
       abort ();
     default:

but it's still fine, while:
./backtrace-dwarf 
backtrace-dwarf: backtrace-dwarf.c:159: main: Assertion `WIFSTOPPED (status)'
failed.
Aborted (core dumped)

That said, the tests looks to me very fragile..

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