linux-kernel - Re: [PATCH 3/5] lib/bitmap: add test for bitmap_{from,to}

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Message-ID: <CAAH8bW8ju7XLkbYya1A1OtqGVGDUAk7dPyw01RsDzg+v7xihyQ@mail.gmail.com>
Date:   Thu, 19 May 2022 09:01:00 -0700
From:   Yury Norov <yury.norov@...il.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     linux-kernel@...r.kernel.org,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>, linux-s390@...r.kernel.org,
        kvm@...r.kernel.org
Subject: Re: [PATCH 3/5] lib/bitmap: add test for bitmap_{from,to}_arr64

On Thu, May 19, 2022 at 8:09 AM Guenter Roeck <linux@...ck-us.net> wrote:
>
> On Thu, Apr 28, 2022 at 01:51:14PM -0700, Yury Norov wrote:
> > Test newly added bitmap_{from,to}_arr64() functions similarly to
> > already existing bitmap_{from,to}_arr32() tests.
> >
> > Signed-off-by: Yury Norov <yury.norov@...il.com>
>
> With this patch in linux-next (including next-20220519), I see lots of
> bitmap test errors when booting 32-bit ppc images in qemu. Examples:
>
> test_bitmap: [lib/test_bitmap.c:600] bitmaps contents differ: expected "0", got "0,65"
> ...
> test_bitmap: [lib/test_bitmap.c:600] bitmaps contents differ: expected "0,65", got "0,65,128"
> test_bitmap: [lib/test_bitmap.c:600] bitmaps contents differ: expected "0,65", got "0,65,128-129"
> test_bitmap: [lib/test_bitmap.c:600] bitmaps contents differ: expected "0,65", got "0,65,128-130"
> ...
> test_bitmap: [lib/test_bitmap.c:600] bitmaps contents differ: expected "0,65,128-143", got "0,65,128-143,208-209"
> test_bitmap: [lib/test_bitmap.c:600] bitmaps contents differ: expected "0,65,128-143", got "0,65,128-143,208-210"
>
> and so on. It only  gets worse from there, and ends with:
>
> test_bitmap: parselist: 14: input is '0-2047:128/256' OK, Time: 4274
> test_bitmap: bitmap_print_to_pagebuf: input is '0-32767
> ', Time: 127267
> test_bitmap: failed 337 out of 3801 tests
>
> Other architectures and 64-bit ppc builds seem to be fine.

Hi Guenter,

Thanks for letting me know. It's really weird because it has already
been for 2 weeks
in next with no issues. But I tested it on mips32, not powerpc. I'll
check what happens
there.

Can you please share your config and qemu image if possible?

Thanks,
Yury