Re: [next] [arm64] kernel BUG at arch/arm64/mm/physaddr.c

From: Naresh Kamboju <naresh.kamboju@linaro.org>
To: Will Deacon <will@kernel.org>
Cc: Linux-Next Mailing List <linux-next@vger.kernel.org>,
	linux-mm <linux-mm@kvack.org>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	open list <linux-kernel@vger.kernel.org>,
	lkft-triage@lists.linaro.org, regressions@lists.linux.dev,
	Andrew Morton <akpm@linux-foundation.org>,
	Stephen Rothwell <sfr@canb.auug.org.au>,
	Arnd Bergmann <arnd@arndb.de>, Ard Biesheuvel <ardb@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Christophe Leroy <christophe.leroy@csgroup.eu>
Subject: Re: [next] [arm64] kernel BUG at arch/arm64/mm/physaddr.c
Date: Thu, 17 Jun 2021 17:45:34 +0530	[thread overview]
Message-ID: <CA+G9fYvCX5fd5dHdaGpQ7wpZNcea-=vtuhapW00D8AUkE5VUqA@mail.gmail.com> (raw)
In-Reply-To: <20210615115044.GC20598@willie-the-truck>

Hi Will,

On Tue, 15 Jun 2021 at 17:20, Will Deacon <will@kernel.org> wrote:
>
> Hi Naresh,
>
> On Tue, Jun 15, 2021 at 04:41:25PM +0530, Naresh Kamboju wrote:
> > Following kernel crash reported while boot linux next 20210615 tag on qemu_arm64
> > with allmodconfig build.

<trim>

> Thanks for the report, although since this appears to be part of a broader
> testing effort, here are some things that I think would make the reports
> even more useful:
>
>   1. An indication as to whether or not this is a regression (i.e. do you
>      have a known good build, perhaps even a bisection?)
>
>   2. Either a link to the vmlinux, or faddr2line run on the backtrace.
>      Looking at the above, I can't tell what sparse_init_nid+0x98/0x6d0
>      actually is.
>
>   3. The exact QEMU command-line you are using, so I can try to reproduce
>      this locally. I think the 0-day bot wraps the repro up in a shell
>      script for you.
>
>   4. Whether or not the issue is reproducible.
>
>   5. Information about the toolchain you used to build the kernel (it
>      happens to be present here because it's in the kernel log, but
>      generally I think it would be handy to specify that in the report).
>
> Please can you provide that information for this crash? It would really
> help in debugging it.

Sorry for the incomplete bug report.

Thanks for sharing these details.
Next time I will include the suggested data points in my email report.

- Naresh