Re: ❌ FAIL:?Test?report?for?kernel?5.11.0-rc7 (arm-next)

From: Will Deacon <will@kernel.org>
To: Veronika Kabatova <vkabatov@redhat.com>
Cc: catalin marinas <catalin.marinas@arm.com>,
	CKI Project <cki-project@redhat.com>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: ❌ FAIL:?Test?report?for?kernel?5.11.0-rc7 (arm-next)
Date: Thu, 11 Feb 2021 11:50:50 +0000	[thread overview]
Message-ID: <20210211115049.GA29894@willie-the-truck> (raw)
In-Reply-To: <1678987485.27351381.1613040362669.JavaMail.zimbra@redhat.com>

On Thu, Feb 11, 2021 at 05:46:02AM -0500, Veronika Kabatova wrote:
> > On Wed, Feb 10, 2021 at 08:17:53PM +0000, Will Deacon wrote:
> > > On Wed, Feb 10, 2021 at 02:31:45PM -0500, Veronika Kabatova wrote:
> > > > > > > > The machine in question can on course be somewhat flaky (hard to
> > > > > > > > eliminate
> > > > > > > > that possibility completely), but I checked our historical data
> > > > > > > > and it
> > > > > > > > didn't fail to boot a single time other than with these two new
> > > > > > > > kernels.
> > > > > > > 
> > > > > > > So the first thing we should probably try is whether vanilla -rc7
> > > > > > > fails
> > > > > > > on
> > > > > > > the machine causing us problems. If it does, then the arm64 queue
> > > > > > > for
> > > > > > > 5.12
> > > > > > > is out of the equation, if not then we can try a targetted
> > > > > > > bisection.
> > > > > > > 
> > > > > > > Would you be able to try v5.11-rc7 please?
> > > > > > 
> > > > > > Can do.
> > > > > 
> > > > > Brill, thanks.
> > > > > 
> > > > > > Someone snatched up the machine in the meanwhile and appears to have
> > > > > > it
> > > > > > reserved till next Monday :/ I sincerely hope that they'll release it
> > > > > > sooner
> > > > > > and have queued up the test job with high priority. Will let you know
> > > > > > right
> > > > > > as I get the results.
> > > > > 
> > > > > Just tell them the machine is broken and they really don't want to use
> > > > > it
> > > > > for anything important ;)
> > > > > 
> > > > 
> > > > Our wishes were granted by the lab fairy and the machine was returned
> > > > rather quickly :)
> > > > 
> > > > The 5.11-rc7 kernel boots.
> > > 
> > > Fantastic! Then it's something in the arm64 for-next/core tree that was
> > > added since then. The diff isn't huge and one change stands out for me, so
> > > let me try reverting that and I'll update the branch...
> > 
> > Ok, I updated for-kernelci so that it contains the arm64 for-next/core
> > branch merged into -rc7, but with a couple of patches reverted on top.
> > 
> > HEAD is	e56137cc7606 ("Revert "arm64/mm: Fix pfn_valid() for ZONE_DEVICE
> > based memory""). Please can you try that?
> > 
> 
> I didn't actually have to, the autopick picked the machine for the testing
> and it happily booted :) \o/

Phew, so I'll drop those from linux-next as well. Do you know if "earlycon"
works on the problematic machine? If possible, it would be helpful to try
booting the bad kernel with earlycon on the cmdline to see if it manages to
say anything in its dying breath.

> Apparently IT cut off our email sending access because we're sending too
> many emails so that's why you don't have the report yet. When we work
> around it I'll make sure to retrigger the sending so you have it.

That's nice of them...

Will

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