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Message-ID: <CA+G9fYvjJgLyEHymByjE8y4OhWfTWbUmQOn0oT2FZoL3T4orVw@mail.gmail.com>
Date: Tue, 25 Jul 2023 12:03:45 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: Puranjay Mohan <puranjay12@...il.com>
Cc: Mark Rutland <mark.rutland@....com>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>,
open list <linux-kernel@...r.kernel.org>,
linux-rpi-kernel@...ts.infradead.org,
Netdev <netdev@...r.kernel.org>, lkft-triage@...ts.linaro.org,
Arnd Bergmann <arnd@...db.de>,
Dan Carpenter <dan.carpenter@...aro.org>,
Linus Walleij <linus.walleij@...aro.org>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>,
Anshuman Khandual <anshuman.khandual@....com>,
Song Liu <song@...nel.org>, Alexei Starovoitov <ast@...nel.org>
Subject: Re: next: Rpi4: Unexpected kernel BRK exception at EL1
Hi Puranjay,
On Mon, 3 Jul 2023 at 15:07, Puranjay Mohan <puranjay12@...il.com> wrote:
>
> Hi Naresh,
>
> On Mon, Jun 26, 2023 at 11:04 AM Puranjay Mohan <puranjay12@...il.com> wrote:
> >
> > Hi Naresh,
> >
> > On Thu, Jun 22, 2023 at 2:35 PM Naresh Kamboju
> > <naresh.kamboju@...aro.org> wrote:
> > >
> > > Hi Mark,
> > >
> > > On Thu, 22 Jun 2023 at 15:12, Mark Rutland <mark.rutland@....com> wrote:
> > > >
> > > > On Wed, Jun 21, 2023 at 01:57:21PM +0100, Mark Rutland wrote:
> > > > > On Wed, Jun 21, 2023 at 06:06:51PM +0530, Naresh Kamboju wrote:
> > > > > > Following boot warnings and crashes noticed on arm64 Rpi4 device running
> > > > > > Linux next-20230621 kernel.
> > > > > >
> > > > > > Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
> > > > > >
> > > > > > boot log:
> > > > > >
> > > > > > [ 22.331748] Kernel text patching generated an invalid instruction
> > > > > > at 0xffff8000835d6580!
> > > > > > [ 22.340579] Unexpected kernel BRK exception at EL1
> > > > > > [ 22.346141] Internal error: BRK handler: 00000000f2000100 [#1] PREEMPT SMP
> > > > >
> > > > > This indicates execution of AARCH64_BREAK_FAULT.
> > > > >
> > > > > That could be from dodgy arguments to aarch64_insn_gen_*(), or elsewhere, and
> > > > > given this is in the networking code I suspect this'll be related to BPF.
> > > > >
> > > > > Looking at next-20230621 I see commit:
> > > > >
> > > > > 49703aa2adfaff28 ("bpf, arm64: use bpf_jit_binary_pack_alloc")
> > > > >
> > > > > ... which changed the way BPF allocates memory, and has code that pads memory
> > > > > with a bunch of AARCH64_BREAK_FAULT, so it looks like that *might* be related.
> > > >
> > > > For the benefit of those just looknig at this thread, there has been some
> > > > discussion in the original thread for this commit. Summary and links below.
> > > >
> > > > We identified a potential issue with missing cache maintenance:
> > > >
> > > > https://lore.kernel.org/linux-arm-kernel/ZJMXqTffB22LSOkd@FVFF77S0Q05N/
> > > >
> > > > Puranjay verified that was causing the problem seen here:
> > > >
> > > > https://lore.kernel.org/linux-arm-kernel/CANk7y0h5ucxmMz4K8sGx7qogFyx6PRxYxmFtwTRO7=0Y=B4ugw@mail.gmail.com/
> > > >
> > > > Alexei has dropped this commit for now:
> > > >
> > > > https://lore.kernel.org/linux-arm-kernel/CAADnVQJqDOMABEx8JuU6r_Dehyf=SkDfRNChx1oNfqPoo7pSrw@mail.gmail.com/
> > >
> > > Thanks for the detailed information.
> > > I am happy to test any proposed fix patches.
> >
> > I have sent the v4 of the patch series:
> > https://lore.kernel.org/bpf/20230626085811.3192402-1-puranjay12@gmail.com/T/#t
> > This works on my raspberry pi 4 setup. If possible can you test this
> > on the similar setup where it was failing earlier?
>
> I think my previous email was missed.
> Can you test the V4 series in the same setup?
I have tested V4 series and reported issues got fixed.
Tested-by: Naresh Kamboju <naresh.kamboju@...aro.org>
Thank you !
> This is still not applied to the bpf-next tree.
>
> Thanks,
> Puranjay.
- Naresh
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