linux-kernel - Re: [tip:x86/urgent] x86/mce: Fix CMCI preemption bugs

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Message-ID: <20140417213012.GC27852@pd.tnic>
Date:	Thu, 17 Apr 2014 23:30:12 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Owen Kibel <qmewlo@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Josh Boyer <jwboyer@...oraproject.org>,
	"Luck, Tony" <tony.luck@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"hpa@...or.com" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"atodorov@...hat.com" <atodorov@...hat.com>,
	"gong.chen@...ux.intel.com" <gong.chen@...ux.intel.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>
Subject: Re: [tip:x86/urgent] x86/mce: Fix CMCI preemption bugs

On Thu, Apr 17, 2014 at 02:21:41PM -0700, Owen Kibel wrote:
> The patch tested was from Chen, Gong
> 
> https://lkml.org/lkml/2014/4/15/838
> 
> It worked, apart from the warning on boot described previously - the
> possible boot message was extracted from /var/log/kern.log
> 
> The above patch on mainline: 3.15-rc1 2014-04-13 [tar.xz]
> 
> seems to have cured the problem

Ok, good. So this is straightened out.

@Ingo: just pick up Gong's fix without the raw_spin_lock* stuff.

> - the kernel appears fine after announcing something like
> 
> kernel: [    7.341085] BUG: using __this_cpu_write() in preemptible
> [00000000] code: modprobe/546
> 
> in the boot process.

This is most likely unrelated and is caused by the preemption checks
added to __this_cpu_* in 188a81409ff7. If you'd like to debug this
further, please send a full dmesg:

dmesg > dmesg.log

Privately is fine too.

Thanks.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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