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From: Nicholas Johnson <nicholas.johnson-opensource@outlook.com.au>
To: "mika.westerberg@linux.intel.com" <mika.westerberg@linux.intel.com>
Cc: Bjorn Helgaas <helgaas@kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>
Subject: Re: Linux v5.5 serious PCI bug
Date: Mon, 9 Dec 2019 13:29:30 +0000
Message-ID: <PSXP216MB043859B2FDA7F999BF88157080580@PSXP216MB0438.KORP216.PROD.OUTLOOK.COM> (raw)
In-Reply-To: <20191209131239.GP2665@lahna.fi.intel.com>

On Mon, Dec 09, 2019 at 03:12:39PM +0200, mika.westerberg@linux.intel.com wrote:
> On Mon, Dec 09, 2019 at 12:34:04PM +0000, Nicholas Johnson wrote:
> > Hi,
> > 
> > I have compiled Linux v5.5-rc1 and thought all was good until I 
> > hot-removed a Gigabyte Aorus eGPU from Thunderbolt. The driver for the 
> > GPU was not loaded (blacklisted) so the crash is nothing to do with the 
> > GPU driver.
> > 
> > We had:
> > - kernel NULL pointer dereference
> > - refcount_t: underflow; use-after-free.
> > 
> > Attaching dmesg for now; will bisect and come back with results.
> 
> Looks like something related to iommu. Does it work if you disable it?
> (intel_iommu=off in the command line).
I thought it could be that, too.

The attachment "dmesg-4" from the original email is with iommu parameters.
The attachment "dmesg-5" from the original email is with no iommu parameters.
Attaching here "dmesg-6" with the iommu explicitly set off like you said.

No difference, still broken. Although, with iommu off, there are less stack traces.

Could it be sysfs-related?

Kind regards,
Nicholas

  reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-09 12:34 Nicholas Johnson
2019-12-09 12:37 ` Pavel Machek
2019-12-09 13:07   ` Nicholas Johnson
2019-12-09 13:12 ` mika.westerberg
2019-12-09 13:29   ` Nicholas Johnson [this message]
2019-12-09 13:33   ` Nicholas Johnson
2019-12-10  7:28     ` mika.westerberg
2019-12-10 12:00       ` Nicholas Johnson
2019-12-10 12:29         ` Lukas Wunner
2019-12-10 12:46           ` Takashi Iwai
2019-12-11  7:33             ` Jiasen Lin
2019-12-10 12:52           ` Nicholas Johnson
2019-12-10 12:34         ` mika.westerberg
2019-12-10 13:39 ` [PATCH] ALSA: hda/hdmi - Fix duplicate unref of pci_dev Lukas Wunner
2019-12-10 13:41   ` Takashi Iwai
2019-12-10 13:47   ` Nicholas Johnson
2019-12-10 13:50     ` Takashi Iwai
2019-12-10 15:34   ` Deucher, Alexander
2019-12-10 15:46     ` Lukas Wunner
2019-12-10 15:53       ` Deucher, Alexander
2019-12-10 16:10         ` Takashi Iwai
2019-12-10 16:51           ` Deucher, Alexander
2019-12-10 16:13         ` Lukas Wunner

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