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Date: Wed, 02 Jan 2002 21:46:06 -0800
From: Andrew Morton <akpm@zip.com.au>
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To: kees <kees@schoen.nl>
CC: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] solves freeze due to serial comm. on SMP
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kees wrote:
> 
> Hi,
> 
> In the beginning of last year I reported a solid freeze problem with Linux
> when I moved from UP to SMP. Some bughunting especially with kdb an hints
> from AM I was able to nail it down to some SMP unsafe irq table handling
> in serial.c.
> I submitted the attached patch to Ted but that never made it to the
> kernel. It _really_ solved the problem as I had a crash sometimes within
> 15 minutes and after applying it I reached uptimes over 100 days.
> 

It looks like somebody has already had a go at fixing this in current
kernels - the restore_flags() has been moved to the end of
shutdown().  (It's not a complete fix, because request_irq() can
schedule).

Are you able to test 2.4.17?
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