GNU bug report logs - #75924
maint: fix s390 buffer flushes

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Message #37 received at 75924 <at> debbugs.gnu.org (full text, mbox):

From: Eduard Stefes <Eduard.Stefes <at> ibm.com>
To: "eggert <at> cs.ucla.edu" <eggert <at> cs.ucla.edu>
Cc: "75924 <at> debbugs.gnu.org" <75924 <at> debbugs.gnu.org>,
 "iii <at> linux.ibm.com" <iii <at> linux.ibm.com>,
 "andreas.hasenack <at> canonical.com" <andreas.hasenack <at> canonical.com>
Subject: RE: bug#75924: maint: fix s390 buffer flushes
Date: Thu, 20 Feb 2025 11:33:13 +0000

Hi,

On Mon, 2025-02-17 at 10:38 +0000, Eduard Stefes wrote:
> 
> ...
> This makes hufts pass and does not affect any other test case. I will
> do more exhaustive tests just to be sure that nothing else is
> affected.
> ...

So, I did some tests. I setup afl++ with a static seed and went through
some minutes of fuzzing on both x86 and s390x.

Results are as expected: 
- many tests(~50%) result in the same error message
- others result in different error messages
- I could not find a crash (note that i tested only a limited time)

at this stage I am hesitating to go forward and try to fix all cases
where hardware and software implementation generate different error
messages. 
I think we are at a solid state here, as both implementations run with
the same test suit. 
Investing more time to get a 100% error message overlap looks like a
bigger effort. We know that the hardware state machine does not simply
map the software, so I fear that it will result in very very cumbersome
error handling code.

> 
> 
> -- 
> Eduard Stefes <eduard.stefes <at> ibm.com>

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