From: Naresh Kamboju <naresh.kamboju@linaro.org>
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>
Subject: Re: qemu-arm64: handle_futex_death - kernel/futex/core.c:661 - Unable to handle kernel unknown 43 at virtual address
Date: Mon, 30 Oct 2023 17:20:40 +0530 [thread overview]
Message-ID: <CA+G9fYsyDQZmsHpN+4qv8q_DsagKbmDZ5vjo60QDEr+uCVXoNA@mail.gmail.com> (raw)
In-Reply-To: <CAMj1kXE9c3YVbiuwB6cQnWsmUu_kh=vnipJgitYcUh_HWeS=OA@mail.gmail.com>
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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
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next prev parent reply other threads:[~2023-10-30 11:50 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-26 14:41 qemu-arm64: handle_futex_death - kernel/futex/core.c:661 - Unable to handle kernel unknown 43 at virtual address Naresh Kamboju
2023-10-26 15:30 ` Mark Rutland
2023-10-26 15:39 ` Ard Biesheuvel
2023-10-27 10:57 ` Naresh Kamboju
2023-10-28 7:42 ` Ard Biesheuvel
2023-10-30 8:07 ` Naresh Kamboju
2023-10-30 8:14 ` Ard Biesheuvel
2023-10-30 11:50 ` Naresh Kamboju [this message]
2023-10-31 7:43 ` Naresh Kamboju
2023-10-31 16:27 ` Mark Rutland
2023-10-31 16:32 ` Mark Rutland
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