linux-kernel - Re: next-20230110: arm64: defconfig+kselftest config boot failed - Unable to handle kernel paging request at virtual address fffffffffffffff8

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Message-ID: <Y72WEvxzARvnWVST@sirena.org.uk>
Date:   Tue, 10 Jan 2023 16:45:06 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Will Deacon <will@...nel.org>
Cc:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        dri-devel@...ts.freedesktop.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        lkft-triage@...ts.linaro.org, regressions@...ts.linux.dev,
        Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Rutland <mark.rutland@....com>,
        Aishwarya TCV <aishwarya.tcv@....com>,
        Anders Roxell <anders.roxell@...aro.org>, james.clark@....com,
        nathan@...nel.org
Subject: Re: next-20230110: arm64: defconfig+kselftest config boot failed -
 Unable to handle kernel paging request at virtual address fffffffffffffff8

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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