linux-kernel - [linux41] regression with 'x86/cacheinfo: Move cacheinfo sysfs code to generic infrastructure' on AMD i686

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Date:	Sun, 26 Jul 2015 08:18:32 +0200
From:	Philip Müller <philm@...jaro.org>
To:	linux-kernel@...r.kernel.org, Sudeep Holla <sudeep.holla@....com>,
	Guenter Roeck <linux@...ck-us.net>, manjaro-dev@...jaro.org
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andre Przywara <andre.przywara@....com>,
	Borislav Petkov <bp@...e.de>
Subject: [linux41] regression with 'x86/cacheinfo: Move cacheinfo sysfs code
 to generic infrastructure' on AMD i686

Hi Guenter, Sudeep,

It now came down to 'x86/cacheinfo: Move cacheinfo sysfs code to generic
infrastructure'[1] as you can see here[2].

The facts are:

- You can't boot on i686 only with more than one CPU core on AMD
hardware (x86_64 however works)
- Using Ubuntu config[3] it boots but creates an kernel >= 1 GB in size
on Manjaro
- By reverting 0d55ba4[4] the kernel boots.

So we have to find out what is causing this issue[5].

kind regards
Philip Müller
--------------------------
Manjaro Project-Lead

[1]
https://github.com/torvalds/linux/commit/0d55ba46bfbee64fd2b492b87bfe2ec172e7b056
[2]
https://raw.githubusercontent.com/philmmanjaro/linux41/master/git-bisect.txt
[3]
https://raw.githubusercontent.com/philmmanjaro/linux41/master/config.4.1.3-040103-generic
[4]
https://github.com/manjaro/packages-core/commit/f7b77f3e84295a6313a9181d520fb48e60453b64
[5] https://github.com/manjaro/packages-core/issues/14


On 24.07.2015 00:23, Philip Müller wrote:
> Hi all,
> 
> I started to test linux 4.1 series with rc6. However, I was never able
> to boot that kernel in i686 architecture. Trying it again with
> VirtualBox gave me more conclusions. Using one core it simply boots up.
> Using more than one CPU core it crashes with:
> 
> Failed to access perfctr msr (MSR c0010007 is 0)
> 
> task: f58e0000 ti: f58e8000 task.ti: f58e800
> EIP: 0060:[<c135a903>] EFLAGS: 00010206 CPU: 0
> EIP is at free_cache_attributes+0x83/0xd0
> EAX: 00000001 EBX: f589d46c ECX: 00000090 EDX: 360c2000
> ESI: 00000000 EDI: c1724a80 EBP: f58e9ec0 ESP: f58e9ea0
>  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
> CR0: 8005003b CR2: 000000ac CR3: 01731000 CR4: 000006d0
> 
> In more rich detail you can find that problem on my bug-tracker for
> Manjaro Linux:
> 
> https://github.com/manjaro/packages-core/issues/14
> 
> I just want to know if you are aware of it. With current 4.1.3 release I
> still face that issue ...
> 
> kind regards
> Philip Müller
> --------------------------
> Manjaro Project-Lead
> 

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