Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:6 as permitted sender) client-ip=2620:137:e000::3:6;
MIME-Version: 1.0
References: <CA+G9fYsCskpn_TNpSwLq9HGUgtT=aZpDzs7SVrqpa9WmyYFaxQ@mail.gmail.com>
 <ZTqGBzOQd4Oi3e9j@FVFF77S0Q05N.cambridge.arm.com> <CAMj1kXE8VrG6aPsjByd83kavw7He6vn=DszhJfAd-TfP9y8VBA@mail.gmail.com>
 <CA+G9fYuQxUhsrL_=uYSAdotU1_Wx7iu5PxFuG9EzWgBE2nMjcw@mail.gmail.com>
 <CAMj1kXESknQ40SZRMFv6Vv32x-2mSuMyOxoURQwwO1apQ+m=jA@mail.gmail.com>
 <CA+G9fYv3Ph6UDpW1uhoXD5QBE4tAZKpUkVy-Oo9NNrghChL_+A@mail.gmail.com> <CAMj1kXE9c3YVbiuwB6cQnWsmUu_kh=vnipJgitYcUh_HWeS=OA@mail.gmail.com>
In-Reply-To: <CAMj1kXE9c3YVbiuwB6cQnWsmUu_kh=vnipJgitYcUh_HWeS=OA@mail.gmail.com>
From:   Naresh Kamboju <naresh.kamboju@linaro.org>
Date:   Mon, 30 Oct 2023 17:20:40 +0530
Message-ID: <CA+G9fYsyDQZmsHpN+4qv8q_DsagKbmDZ5vjo60QDEr+uCVXoNA@mail.gmail.com>
Subject: Re: qemu-arm64: handle_futex_death - kernel/futex/core.c:661 - Unable
 to handle kernel unknown 43 at virtual address
To:     Ard Biesheuvel <ardb@kernel.org>
Cc:     Mark Rutland <mark.rutland@arm.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Oliver Upton <oliver.upton@linux.dev>,
        Linux-Next Mailing List <linux-next@vger.kernel.org>,
        open list <linux-kernel@vger.kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        lkft-triage@lists.linaro.org, Arnd Bergmann <arnd@arndb.de>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@kernel.org>,
        Anders Roxell <anders.roxell@linaro.org>,
        Dan Carpenter <dan.carpenter@linaro.org>,
        LTP List <ltp@lists.linux.it>, Petr Vorel <pvorel@suse.cz>
Content-Type: multipart/mixed; boundary="000000000000661c610608eda645"
Precedence: bulk

--000000000000661c610608eda645
Content-Type: text/plain; charset="UTF-8"

On Mon, 30 Oct 2023 at 13:45, Ard Biesheuvel <ardb@kernel.org> wrote:
>
> On Mon, 30 Oct 2023 at 09:07, Naresh Kamboju <naresh.kamboju@linaro.org> wrote:
> >
> > On Sat, 28 Oct 2023 at 13:12, Ard Biesheuvel <ardb@kernel.org> wrote:
> > >
> > > On Fri, 27 Oct 2023 at 12:57, Naresh Kamboju <naresh.kamboju@linaro.org> wrote:
> > > >
> > > > On Thu, 26 Oct 2023 at 21:09, Ard Biesheuvel <ardb@kernel.org> wrote:
> > > > >
> > > > > On Thu, 26 Oct 2023 at 17:30, Mark Rutland <mark.rutland@arm.com> wrote:
> > > > > >
> > > > > > On Thu, Oct 26, 2023 at 08:11:26PM +0530, Naresh Kamboju wrote:
> > > > > > > Following kernel crash noticed on qemu-arm64 while running LTP syscalls
> > > > > > > set_robust_list test case running Linux next 6.6.0-rc7-next-20231026 ...
> > > > > > It looks like this is fallout from the LPA2 enablement.
> > > > > >
> > > > > > According to the latest ARM ARM (ARM DDI 0487J.a), page D19-6475, that "unknown
> > > > > > 43" (0x2b / 0b101011) is the DFSC for a level -1 translation fault:
> > > > > >
> > > > > >         0b101011 When FEAT_LPA2 is implemented:
> > > > > >                  Translation fault, level -1.
> > > > > >
> > > > > > It's triggered here by an LDTR in a get_user() on a bogus userspace address.
> > > > > > The exception is expected, and it's supposed to be handled via the exception
> > > > > > fixups, but the LPA2 patches didn't update the fault_info table entries for all
> > > > > > the level -1 faults, and so those all get handled by do_bad() and don't call
> > > > > > fixup_exception(), causing them to be fatal.
> > > > > >
> > > > > > It should be relatively simple to update the fault_info table for the level -1
> > > > > > faults, but given the other issues we're seeing I think it's probably worth
> > > > > > dropping the LPA2 patches for the moment.
> > > > > >
> > > > >
> > > > > Thanks for the analysis Mark.
> > > > >
> > > > > I agree that this should not be difficult to fix, but given the other
> > > > > CI problems and identified loose ends, I am not going to object to
> > > > > dropping this partially or entirely at this point. I'm sure everybody
> > > > > will be thrilled to go over those 60 patches again after I rebase them
> > > > > onto v6.7-rc1 :-)
> > > >
> > > > I am happy to test any proposed fix patch.
> > > >
> > >
> > > Thanks Naresh. Patch attached.
> >
> > This patch did not solve the reported problem.
> > Test log links,
> >  - https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/naresh/tests/2XTP1lXcUUscT357YaAm2G1AhpS
> >
>
> Oops, sorry about that.
>
> Fixed patch attched.

Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>

- Naresh

--000000000000661c610608eda645
Content-Type: application/x-patch; 
	name="v2-0001-Add-missing-ESR-decoding-for-level-1-translation-.patch"
Content-Disposition: attachment; 
	filename="v2-0001-Add-missing-ESR-decoding-for-level-1-translation-.patch"
Content-Transfer-Encoding: base64
Content-ID: <f_locmjrdg0>
X-Attachment-Id: f_locmjrdg0
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--000000000000661c610608eda645--