linux-kernel - Re: small regression: hwmon: (applesmc) Check key count before proceeding

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Message-Id: <76837691-ED07-4448-BC56-9D16EA321970@colorremedies.com>
Date:	Sun, 24 Nov 2013 09:22:52 -0700
From:	Chris Murphy <bugzilla@...orremedies.com>
To:	Henrik Rydberg <rydberg@...omail.se>
Cc:	Michele Baldessari <michele@...syn.org>, jwboyer@...oraproject.org,
	Guenter Roeck <linux@...ck-us.net>,
	linux-kernel@...r.kernel.org, lm-sensors@...sensors.org,
	Chris Murphy <chris@...rf.com>
Subject: Re: small regression: hwmon: (applesmc) Check key count before proceeding - 5f4513864304672e6ea9eac60583eeac32e679f2

On Nov 24, 2013, at 2:44 AM, Henrik Rydberg <rydberg@...omail.se> wrote:

> Hi Michele,
> 
>> The issue Chris has seen in Fedora on one MacBookPro4,1
>> (https://bugzilla.redhat.com/show_bug.cgi?id=1033414) is that this
>> machine returns a huge number from read_register_count() so now we will
>> try to allocate an insane amount of memory and we will barf:
>> [    8.603053] applesmc: key count changed from 261 to 1392508929
> 
> I was under the impression that this machine was tested before, and that
> 
> commit 25f2bd7f5add608c1d1405938f39c96927b275ca
> Author: Henrik Rydberg <rydberg@...omail.se>
> Date:   Wed Oct 2 19:15:03 2013 +0200
> 
>    hwmon: (applesmc) Always read until end of data
> 
> resolved this problem? But if the kernel under test is 3.11.8, both patches are
> already present... Chris, could you please sched some light on this before
> moving on?

Well, it seems to be a another one off event. It's the same hardware as before, and it was booting from a USB stick containing Fedora 20 final test candidate 2 which uses kernel 3.11.8. An immediate reboot did not reproduce the problem, nor multiple subsequent reboots. I think I previously mentioned a preponderance of these events happen when booting from USB sticks.

It would be nice to have an identical model for this testing. I suspect most users wouldn't go to the trouble to report the occasional, seemingly one off, events like this. So unfortunately it's  uncertain if the hardware I have has a unique problem, or if it's a model specific behavior.

Chris Murphy--
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