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Subject: Re: NULL pointer dereference in msi_set_mask_bit
To:     Thomas Gleixner <tglx@linutronix.de>
Cc:     Bjorn Helgaas <helgaas@kernel.org>,
        Bjorn Helgaas <bhelgaas@google.com>, linux-pci@vger.kernel.org,
        linux-kernel@vger.kernel.org, Marc Zyngier <marc.zyngier@arm.com>
References: <b9bd8405-64b6-2bea-f5ce-d3ab4d82452a@molgen.mpg.de>
 <20180718140636.GD128988@bhelgaas-glaptop.roam.corp.google.com>
 <alpine.DEB.2.21.1807181646280.1568@nanos.tec.linutronix.de>
 <6339fdef-a335-b833-4022-23725fd86d9e@molgen.mpg.de>
 <alpine.DEB.2.21.1807181722020.1568@nanos.tec.linutronix.de>
 <178bb701-56af-06cf-4836-1a26e74f2b07@molgen.mpg.de>
 <alpine.DEB.2.21.1807182058110.1689@nanos.tec.linutronix.de>
 <7660f2f2-0c37-a617-ecdc-949cd4ecc060@molgen.mpg.de>
 <ed32c159-1629-68e5-26e2-b1770a43acc3@molgen.mpg.de>
 <alpine.DEB.2.21.1807191541130.1602@nanos.tec.linutronix.de>
From:   Paul Menzel <pmenzel+linux-pci@molgen.mpg.de>
Message-ID: <d8a4e146-4c9f-6849-ef0e-d7382ddd147b@molgen.mpg.de>
Date:   Thu, 19 Jul 2018 15:56:09 +0200
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Dear Thomas,


On 07/19/18 15:48, Thomas Gleixner wrote:

> On Thu, 19 Jul 2018, Paul Menzel wrote:
>=20
>> I had to copy the files, and then was able to create an archive with
>> non-zero files. Please find the tar archive attached.
>=20
> Thanks for providing the data. All looks normal there.

Thank you for verifying that.

> Just for clarification. Did this happen exactly once, or did it just no=
t
> happen again after you plugged in a serial cable?

The kernel also panics sometimes when loading the amdgpu module [1]. Befo=
re
using the serial console it crashed often, but I do *not* know the reason=
=2E

After connecting the serial console, the problem only happened exactly
once.

> One thing you might try is to disable irqbalanced when the machine is u=
p
> and then stress the affinity setter mechanism with scripting.
>=20
> Something like
>=20
> while true; do
>  for I in {0..3}; do echo $I > /proc/irq/$IRQ/smp_affinity_list; done
> done
>=20
> might be able to trigger it. But don't ask me which interrupt was invol=
ved,
> so you have to iterate through the ones which are MSI based.
>=20
> 'cat /proc/interrupt | grep MSI' will tell you.

Thank you. I guess I=E2=80=99ll use the machine for some time, and observ=
e if the
problem shows up again.

Thank you very much for your awesome help.


Kind regards,

Paul


[1]: https://bugs.freedesktop.org/show_bug.cgi?id=3D105684


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