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Date:   Tue, 10 Jan 2023 16:45:06 +0000
From:   Mark Brown <broonie@kernel.org>
To:     Will Deacon <will@kernel.org>
Cc:     Naresh Kamboju <naresh.kamboju@linaro.org>,
        Linux-Next Mailing List <linux-next@vger.kernel.org>,
        open list <linux-kernel@vger.kernel.org>,
        dri-devel@lists.freedesktop.org,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        lkft-triage@lists.linaro.org, regressions@lists.linux.dev,
        Arnd Bergmann <arnd@arndb.de>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Aishwarya TCV <aishwarya.tcv@arm.com>,
        Anders Roxell <anders.roxell@linaro.org>, james.clark@arm.com,
        nathan@kernel.org
Subject: Re: next-20230110: arm64: defconfig+kselftest config boot failed -
 Unable to handle kernel paging request at virtual address fffffffffffffff8
Message-ID: <Y72WEvxzARvnWVST@sirena.org.uk>
References: <CA+G9fYsns3krivbPSjQ1c1EQpVyd-bkW84MaUvqMTQr9c=iEaw@mail.gmail.com>
 <20230110163258.GC9436@willie-the-truck>
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On Tue, Jan 10, 2023 at 04:32:59PM +0000, Will Deacon wrote:
> On Tue, Jan 10, 2023 at 09:44:40PM +0530, Naresh Kamboju wrote:

> > GOOD: next-20230109  (defconfig + kselftests configs)
> > BAD: next-20230110 (defconfig + kselftests configs)

> I couldn't find a kselftests .config in the tree (assumedly I'm just ont
> looking hard enough), but does that happen to enable CONFIG_STACK_TRACER=y?

It's adding on all the config fragments in

   tools/testing/selftests/*/config

which includes ftrace, which does set STACK_TRACER>

> If so, since you're using clang, I wonder if this is an issue with
> 68a63a412d18 ("arm64: Fix build with CC=clang, CONFIG_FTRACE=y and
> CONFIG_STACK_TRACER=y")?

ftrace also enables FTRACE.

> Please let us know how the bisection goes...

Not sure that Naresh has a bisection going, I don't think he's got
direct access to such a board.

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