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From:   Max Filippov <jcmvbkbc@gmail.com>
Date:   Mon, 26 Dec 2022 13:10:40 -0800
Message-ID: <CAMo8BfKR2quFYBKmVdgmFfhP0y2jCTwKB7Det9o0a6PYuJkP3A@mail.gmail.com>
Subject: Re: Linux 6.2-rc1
To:     Guenter Roeck <linux@roeck-us.net>
Cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Vlastimil Babka <vbabka@suse.cz>,
        Peter Zijlstra <peterz@infradead.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Kees Cook <keescook@chromium.org>
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On Mon, Dec 26, 2022 at 12:44 PM Guenter Roeck <linux@roeck-us.net> wrote:
> xtensa:allmodconfig
>
> Building xtensa:allmodconfig ... failed
> --------------
> Error log:
> kernel/kcsan/kcsan_test.c: In function '__report_matches':
> kernel/kcsan/kcsan_test.c:257:1: error: the frame size of 1680 bytes is larger than 1536 bytes
>
> Bisect for both points to commit e240e53ae0abb08 ("mm, slub: add
> CONFIG_SLUB_TINY").  Reverting it on its own is not possible, but
> reverting the following two patches fixes the problem.
>
> 149b6fa228ed mm, slob: rename CONFIG_SLOB to CONFIG_SLOB_DEPRECATED
> e240e53ae0ab mm, slub: add CONFIG_SLUB_TINY
>
> Context: CONFIG_SLUB_TINY is enabled with allmodconfig builds.
> This enables some previously disabled configurations and disables
> some previously enabled configurations. Not sure if that is a good
> thing or a bad thing, but it does result in the above errors.

For xtensa I've posted the following fix:
https://lore.kernel.org/lkml/20221223074238.4092772-1-jcmvbkbc@gmail.com/
I suspect that previously KCSAN was disabled in allmodconfig builds for xtensa.

-- 
Thanks.
-- Max