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From: Borislav Petkov <bp@alien8.de>
To: Doug Smythies <dsmythies@telus.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: As of kernel 4.4-rc1 segmentation fault if msr module not loaded. [REGRESSION][BISECTED]
Date: Thu, 26 Nov 2015 19:09:34 +0100	[thread overview]
Message-ID: <20151126180934.GB18183@pd.tnic> (raw)
In-Reply-To: <000301d12867$19ba3030$4d2e9090$@net>

On Thu, Nov 26, 2015 at 08:25:43AM -0800, Doug Smythies wrote:
> Hi,
> 
> This might be considered a minor issue, but I submit my
> findings anyhow.
> 
> In some distros, the msr module is not loaded by default.
> (I guess not built in by default, would be more correct.)
> I often forget to load it before using "rdmsr" or "wrmsr".
> It was never an issue before, but as of Kernel 4.4-rc1
> it causes a segmentation fault crash. Example:
> 
> # rdmsr -a 0x19a
> Segmentation fault (core dumped)

You can either cherrypick

http://git.kernel.org/tip/2d5be37d686c4dae8e60d20283d6f44ac2c44f65

or wait until it trickles upwards to Linus, most likely -rc3.

Thanks for the report. Good to know what else broke.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.

  reply	other threads:[~2015-11-26 18:09 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-11-26 16:25 Doug Smythies
2015-11-26 18:09 ` Borislav Petkov [this message]
2015-11-27 16:12   ` Doug Smythies

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