From: "Doug Smythies" <dsmythies@telus.net>
To: "'Borislav Petkov'" <bp@alien8.de>
Cc: <linux-kernel@vger.kernel.org>, "Doug Smythies" <dsmythies@telus.net>
Subject: RE: As of kernel 4.4-rc1 segmentation fault if msr module not loaded. [REGRESSION][BISECTED]
Date: Fri, 27 Nov 2015 08:12:59 -0800 [thread overview]
Message-ID: <000401d1292e$7c50ce80$74f26b80$@net> (raw)
In-Reply-To: <20151126180934.GB18183@pd.tnic>
On 2015.11.26 10:10 Borislav Petkov wrote:
> On Thu, Nov 26, 2015 at 08:25:43AM -0800, Doug Smythies wrote:
>>
>> 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
Just for completeness:
I confirm that the above commit fixes the issue raised herein.
Thanks.
... Doug
prev parent reply other threads:[~2015-11-27 16:13 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-26 16:25 As of kernel 4.4-rc1 segmentation fault if msr module not loaded. [REGRESSION][BISECTED] Doug Smythies
2015-11-26 18:09 ` Borislav Petkov
2015-11-27 16:12 ` Doug Smythies [this message]
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