linux-kernel - Re: [PATCH v7 0/3] scanf: convert self-test to KUnit

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Message-ID: <Z6uGPZZ7LioJmekz@smile.fi.intel.com>
Date: Tue, 11 Feb 2025 19:17:49 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Tamir Duberstein <tamird@...il.com>
Cc: David Gow <davidgow@...gle.com>, Petr Mladek <pmladek@...e.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Sergey Senozhatsky <senozhatsky@...omium.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Shuah Khan <shuah@...nel.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v7 0/3] scanf: convert self-test to KUnit

On Tue, Feb 11, 2025 at 10:57:11AM -0500, Tamir Duberstein wrote:
> On Tue, Feb 11, 2025 at 10:54 AM Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com> wrote:
> > On Tue, Feb 11, 2025 at 10:47:03AM -0500, Tamir Duberstein wrote:
> > > On Tue, Feb 11, 2025 at 10:40 AM Andy Shevchenko
> > > <andriy.shevchenko@...ux.intel.com> wrote:
> > > > On Tue, Feb 11, 2025 at 10:13:36AM -0500, Tamir Duberstein wrote:

...

> > > > > - Use original test assertions as KUNIT_*_EQ_MSG produces hard-to-parse
> > > > >   messages. The new failure output is:
> > > >
> > > > It would be good if you put into cover letter, or even in the respectful patch
> > > > the example of the error report for the old code and new code that it will be
> > > > clear how it changes.
> > > >
> > > > >     vsscanf("0 1e 3e43 31f0 0 0 5797 9c70", "%1hx %2hx %4hx %4hx %1hx %1hx %4hx %4hx", ...) expected 837828163 got 1044578334
> > > > >             not ok 1 " "
> > > > >         # numbers_list_field_width_val_width: ASSERTION FAILED at lib/scanf_kunit.c:92
> > > > >     vsscanf("dc2:1c:0:3531:2621:5172:1:7", "%3hx:%2hx:%1hx:%4hx:%4hx:%4hx:%1hx:%1hx", ...) expected 892403712 got 28
> > > > >             not ok 2 ":"
> > > > >         # numbers_list_field_width_val_width: ASSERTION FAILED at lib/scanf_kunit.c:92
> > > > >     vsscanf("e083,8f6e,b,70ca,1,1,aab1,10e4", "%4hx,%4hx,%1hx,%4hx,%1hx,%1hx,%4hx,%4hx", ...) expected 1892286475 got 757614
> > > > >             not ok 3 ","
> > > > >         # numbers_list_field_width_val_width: ASSERTION FAILED at lib/scanf_kunit.c:92
> > > > >     vsscanf("2e72-8435-1-2fc-7cbd-c2f1-7158-2b41", "%4hx-%4hx-%1hx-%3hx-%4hx-%4hx-%4hx-%4hx", ...) expected 50069505 got 99381
> > > > >             not ok 4 "-"
> > > > >         # numbers_list_field_width_val_width: ASSERTION FAILED at lib/scanf_kunit.c:92
> > > > >     vsscanf("403/0/17/1/11e7/1/1fe8/34ba", "%3hx/%1hx/%2hx/%1hx/%4hx/%1hx/%4hx/%4hx", ...) expected 65559 got 1507328
> > > > >             not ok 5 "/"
> > > > >         # numbers_list_field_width_val_width: pass:0 fail:5 skip:0 total:5
> > > > >         not ok 4 numbers_list_field_width_val_width
> > > > >         # numbers_slice: ASSERTION FAILED at lib/scanf_kunit.c:92
> > > > >     vsscanf("3c87eac0f4afa1f9231da52", "%1hx%4hx%4hx%4hx%1hx%4hx%4hx%1hx", ...) expected 1257942031 got 2886715518
> > >
> > > Makes sense. As you can see the error report for the new code is
> > > included here. I'll add the old code's error report if I have to
> > > respin v8.
> >
> > At a bare minimum. can you add in the reply to this email?
> 
> Oh, sure:
> 
> On Tue, Feb 11, 2025 at 6:54 AM Petr Mladek <pmladek@...e.com> wrote:
> >
> > [...]
> >
> > [  383.100048] test_scanf: vsscanf("1574 9 64ca 935b 7 142d ff58 0", "%4hx %1hx %4hx %4hx %1hx %4hx %4hx %1hx", ...) expected 2472240330 got 1690959881
> > [  383.102843] test_scanf: vsscanf("f12:2:d:2:c166:1:36b:1906", "%3hx:%1hx:%1hx:%1hx:%4hx:%1hx:%3hx:%4hx", ...) expected 131085 got 851970
> > [  383.105376] test_scanf: vsscanf("4,b2fe,3,593,6,0,3bde,0", "%1hx,%4hx,%1hx,%3hx,%1hx,%1hx,%4hx,%1hx", ...) expected 93519875 got 242430
> > [  383.105659] test_scanf: vsscanf("6-1-2-1-d9e6-f-93e-e567", "%1hx-%1hx-%1hx-%1hx-%4hx-%1hx-%3hx-%4hx", ...) expected 65538 got 131073
> > [  383.106127] test_scanf: vsscanf("72d6/35/e88d/1/0/6c8c/7/1", "%4hx/%2hx/%4hx/%1hx/%1hx/%4hx/%1hx/%1hx", ...) expected 125069 got 3901554741
> > [  383.106235] test_scanf: vsscanf("c9bea1b8122113e9a168df573", "%4hx%4hx%1hx%4hx%4hx%1hx%4hx%3hx", ...) expected 571539457 got 106936

> > [  383.106398] test_scanf: failed 6 out of 2545 tests

Is it me who cut something or the above missing this information (total tests)?
If the latter, how are we supposed to answer to the question if the failed test
is from new bunch of cases I hypothetically added or regression of the existing
ones? Without this it seems like I need to go through all failures. OTOH it may
be needed anyway as failing test case needs an investigation.

> This is from https://lore.kernel.org/all/Z6s6WsIw3VCGys6K@pathway.suse.cz/
> (doesn't load for me, seems lore is having problems).

-- 
With Best Regards,
Andy Shevchenko