linux-kernel - RE: Panic and page fault in loop during handling NMI backtrace handler

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Message-ID: <27240C0AC20F114CBF8149A2696CBE4A01B63136@SHSMSX101.ccr.corp.intel.com>
Date:	Wed, 16 Oct 2013 02:09:47 +0000
From:	"Liu, Chuansheng" <chuansheng.liu@...el.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	"Ingo Molnar (mingo@...nel.org)" <mingo@...nel.org>,
	"hpa@...or.com" <hpa@...or.com>,
	"fweisbec@...il.com" <fweisbec@...il.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"paulmck@...ux.vnet.ibm.com" <paulmck@...ux.vnet.ibm.com>,
	"Peter Zijlstra (peterz@...radead.org)" <peterz@...radead.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"'linux-kernel@...r.kernel.org' (linux-kernel@...r.kernel.org)" 
	<linux-kernel@...r.kernel.org>,
	"Wang, Xiaoming" <xiaoming.wang@...el.com>,
	"Li, Zhuangzhi" <zhuangzhi.li@...el.com>
Subject: RE: Panic and page fault in loop during handling NMI backtrace
 handler

Hello Steven,

> -----Original Message-----
> From: Steven Rostedt [mailto:rostedt@...dmis.org]
> Sent: Wednesday, October 16, 2013 10:08 AM
> To: Liu, Chuansheng
> Cc: Ingo Molnar (mingo@...nel.org); hpa@...or.com; fweisbec@...il.com;
> akpm@...ux-foundation.org; paulmck@...ux.vnet.ibm.com; Peter Zijlstra
> (peterz@...radead.org); x86@...nel.org; 'linux-kernel@...r.kernel.org'
> (linux-kernel@...r.kernel.org); Wang, Xiaoming; Li, Zhuangzhi
> Subject: Re: Panic and page fault in loop during handling NMI backtrace handler
> 
> On Wed, 16 Oct 2013 01:54:51 +0000
> "Liu, Chuansheng" <chuansheng.liu@...el.com> wrote:
> 
> 
> > > Since the NMI iretq nesting has been fixed, there's no reason that
> > I think you patch fix the infinite loop, we will have a test soon.
> > BTW, we are using 3.10, could you help to point out which NMI iretq nesting
> patch?
> 
> There were many. You can read about what was done here:
> 
>  https://lwn.net/Articles/484932/
> 
> The original is here:
> 
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ccd49c
> 2391773ffbf52bb80d75c4a92b16972517
> 
> But more were added.
> 
> But that is back in 3.3, so 3.10 has all the required updates.
Thanks your info, is trying your patch now.

> 
> -- Steve
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