linux-kernel - RE: endless loop in native_flush_tlb_others in smp

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Message-ID: <924EFEDD5F540B4284297C4DC59F3DEEAF9755@orsmsx423.amr.corp.intel.com>
Date:	Tue, 11 Mar 2008 07:01:56 -0700
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	<chunkeey@....de>, "Jike Song" <albcamus@...il.com>
Cc:	"Linux Kernel" <linux-kernel@...r.kernel.org>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Brown, Len" <len.brown@...el.com>
Subject: RE: endless loop in native_flush_tlb_others in smp_64.c

 

>-----Original Message-----
>From: chunkeey@....de [mailto:chunkeey@....de] 
>Sent: Tuesday, March 11, 2008 3:31 AM
>To: Jike Song
>Cc: Linux Kernel; Pallipadi, Venkatesh; Ingo Molnar; Thomas 
>Gleixner; Brown, Len
>Subject: Re: endless loop in native_flush_tlb_others in smp_64.c
>
>On Tuesday 11 March 2008 10:55:40 Jike Song wrote:
>> On Tue, Mar 11, 2008 at 6:16 AM, Chr <chunkeey@....de> wrote:
>> > Hi,
>> >  ever since I moved to 2.6.25-rcY (Y should be between 2 and 5!).
>> >  I've seen several, but really hard-to-catch instant freezes on my
>> >  AMD64 Athlon X2 4200+ system...
>>
>> Here I guess 2.6.24 is fine for you?
>Yes, 2.6.24(.3) is fine!
>
>> >  Most of them happend in X.org so at first I thought it 
>had something to
>> > do with the NVIDIA module... BUT, one time it froze "a way 
>before" the
>> > module could get loaded...
>> >
>> >  ---
>> >  SYSRQ-P revealed that the CPU were looping inside:
>> >
>> >  smp_64.c native_flush_tlb_others:
>> >  assembler code:
>> >  < 1ee:   f3 90                   pause
>> >  < 1f0:   f6 45 00 03             testb  $0x3,0x0(%rbp)
>> >  < 1f4:   75 f8                   jne    1ee
>> > <native_flush_tlb_others+0x5f>
>> >
>> >  also known as: (in C)
>> >
>> >  while (!cpus_empty(f->flush_cpumask))
>> >         cpu_relax();
>> >
>> >  So... has anyone a good idea what's happening here 
>exactly? Or is there
>> >  already another topic or even a patch available?
>>
>> Would you please attach your config file?  Do you have 
>CONFIG_CPU_IDLE set?
>(Attached). Yes, CONFIG_CPU_IDLE is enabled! I guess I should 
>now disable it, 
>try again and report back, right?! ;-) 

I don't think it is related to CPU_IDLE. SYSRQ-T that Thomas asked
should give more clues.

Thanks,
Venki
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