Subject: Re: [PATCH] Readd BUG for SMP TLB IPI
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Andi Kleen <ak@suse.de>
Cc: torvalds@osdl.org,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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Date: 09 Jul 2003 17:53:28 +0100
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On Mer, 2003-07-09 at 12:41, Andi Kleen wrote:
> > We have recorded retransmitted IPI's on some boards (notably the
> > infamous BP6). They do happen. Early 2.4 had a fix for handling the
> > replay case too, but someone lost it and BP6 boards no longer work as
> > reliably.
> 
> Ok, all non broken hardware.

It can happen to any PII/PIII box, its just very very rare on others, so
rare I guess such crashes are in the noise.

> I don't believe it. It would cause an immediate hang because the goto out
> does not ack the IPI.  Surely such hangs would have been reported?

See - trawling bug data is *useful* 8)

For 2.4.x crashes relating to IPI replay bugs are reported very occasionally, for
2.5 I've no idea at all


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