[Bug server/30387] gdbserver assert error on arm platform

["luis.machado at arm dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30387

Luis Machado <luis.machado at arm dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW

--- Comment #21 from Luis Machado <luis.machado at arm dot com> ---
Hi,

Thanks for the patch.

A few comments.

When running this test on a 32-bit docker instance in 64-bit hardware, against
the native-gdbserver board, I'm seeing FAIL's:

# of expected passes            3074
# of unexpected failures        13

The FAIL's are of this kind:

FAIL: gdb.threads/next-fork-exec-other-thread.exp: fork_func=fork:
target-non-stop=on: non-stop=off: displaced-stepping=off: i=0: next to other
line

They fail for both a patched and an unpatched gdb. But I see 12 unexpected core
files for the unpatched gdb.

It passes for both patched and unpatched native gdb though. So it might not be
exercising the bug there.

Also, I gave the testcase a try, and I noticed it takes a reasonably long time
to run, both on 32-bit and 64-bit.

Is it a timing issue of some kind that we need a lot of iterations to run to
get it to show up?

From the testcase description, it looks like this is mostly a software
single-step issue and on gdbserver. Should we isolate the tests to gdbserver
and known targets using software single-step instead of making all targets run
the test only to potentially PASS every time?

So, in summary:

* For native gdb (32-bit or 64-bit), this doesn't seem to be exercising the
bug.

* For native-gdbserver on 64-bit, it doesn't seem to exercise the bug.

* For native-gdbserver on 32-bit, I see unexpected core files, which indicates
it does exercise the bug, but I also see unexpected failures, which may be
something off with the testcase patterns.

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