From: Stanislaw Gruszka <sgruszka@redhat.com>
To: Kalle Valo <kvalo@adurom.com>
Cc: linux-wireless@vger.kernel.org
Subject: Re: iwlagn: crash when unloading the module
Date: Wed, 4 May 2011 15:26:03 +0200 [thread overview]
Message-ID: <20110504132602.GA2183@redhat.com> (raw)
In-Reply-To: <87iptsgk5y.fsf@purkki.adurom.net>
On Tue, May 03, 2011 at 01:20:25PM +0300, Kalle Valo wrote:
> I noticed today a crash when removing iwlagn module. I can see the
> crash everytime on my lenovo x201 (x86 64bit, i5) with this wireless
> chip:
>
> [ 19.484551] iwlagn 0000:02:00.0: Detected Intel(R) Centrino(R)
> Ultimate-N 6300 AGN, REV=0x74
>
> As I'm travelling I only have two bad quality screenshots and 40 MB
> video of the crash :) From the stacktrace it looks that this is iommu
> related:
>
> http://www.adurom.com/~kvalo/tmp/iwlagn/rmmod-iommu-crash/1.png
> http://www.adurom.com/~kvalo/tmp/iwlagn/rmmod-iommu-crash/2.png
>
> This is a new laptop and most likely I haven't removed iwlagn module
> before. So this shouldn't be a regression.
We can not exclude iwlagn problem only triggered with intel iommu,
because problem does not happen with other modules, or does it?
Except test patch pointed by Johannes, I suggest turning on
CONFIG_DMA_API_DEBUG and test with intel_iommu=on and intel_iommu=off.
Stanislaw
next prev parent reply other threads:[~2011-05-04 13:25 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-03 10:20 iwlagn: crash when unloading the module Kalle Valo
2011-05-03 14:42 ` wwguy
2011-05-03 15:07 ` Johannes Berg
2011-05-03 15:07 ` Johannes Berg
2011-05-07 5:40 ` Kalle Valo
2011-05-06 4:11 ` Kalle Valo
2011-05-04 13:26 ` Stanislaw Gruszka [this message]
2011-05-07 5:42 ` Kalle Valo
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