From: Chr <chunkeey@web.de>
To: linux-kernel@vger.kernel.org
Subject: endless loop in native_flush_tlb_others in smp_64.c
Date: Mon, 10 Mar 2008 23:16:54 +0100
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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... 

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 (and desynced my raid.......). 

---
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?

Regards,
	Chr.
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