linux-kernel - Re: [PATCH v3 1/1] PCI: Fix bug resulting in double hpmemsize being assigned to MMIO window

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Date:   Thu, 21 Nov 2019 11:55:07 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Nicholas Johnson <nicholas.johnson-opensource@...look.com.au>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "mika.westerberg@...ux.intel.com" <mika.westerberg@...ux.intel.com>,
        "corbet@....net" <corbet@....net>,
        "benh@...nel.crashing.org" <benh@...nel.crashing.org>,
        "logang@...tatee.com" <logang@...tatee.com>,
        Naresh Kamboju <naresh.kamboju@...aro.org>
Subject: Re: [PATCH v3 1/1] PCI: Fix bug resulting in double hpmemsize being
 assigned to MMIO window

[+cc Naresh]

On Thu, Nov 21, 2019 at 02:52:41PM +0000, Nicholas Johnson wrote:
> On Tue, Nov 19, 2019 at 07:38:28AM -0600, Bjorn Helgaas wrote:
> > On Tue, Nov 19, 2019 at 03:17:04AM +0000, Nicholas Johnson wrote:
> > > I did just discover linux-next and I built it. Should I be doing this 
> > > more often to help find regressions?
> > 
> > Yes, if you build and run linux-next, that's a great service because
> > it helps find problems before they appear in mainline.
> 
> Funnily enough, I just built Linux next-20191121 and it has a NULL 
> dereference on start-up, which renders the system unusable.
> 
> Can anybody else please confirm? I enabled most of the new options since 
> the last linux-next a few days before.
> ...

> Here is a preliminary bug report (assuming you are meant to report 
> linux-next bugs here):
> https://bugzilla.kernel.org/show_bug.cgi?id=205621

Looks similar to these reports I found by searching for kernfs_find_ns on
https://lore.kernel.org/lkml:

  https://lore.kernel.org/r/000000000000bdfc8e0597ddbde4@google.com
  https://lore.kernel.org/r/000000000000c1e9090597ddbd9d@google.com
  https://lore.kernel.org/r/CA+G9fYsrRw2SRb92eROCt6aU==j6Qr9Fe4AmJyn4fMj5gDFt=w@mail.gmail.com

Thanks very much for doing this testing and reporting the results.  I
don't think there's anything more you need to do.  It looks like
Naresh already cc'd some likely candidates.

Bjorn