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Date: Sun, 17 Feb 2008 17:50:40 +0100
From: Kris Kennaway <kris@FreeBSD.org>
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To: Michiel Boland <michiel@boland.org>
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Cc: freebsd-current@freebsd.org
Subject: Re: PRINTF_BUFR_SIZE (Re: 7.0 RC2 kernel panic with Kqemu/AMD64)
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Michiel Boland wrote:
> On Sun, 17 Feb 2008, Gary Jennejohn wrote:
> 
> [...]
>> I can't help with your problem, but I suggest that you add
>> options         PRINTF_BUFR_SIZE=128
>> to your kernel config file to avoid the above corrupted output.
> 
> Any reason why this PRINTF_BUFR_SIZE option isn't in GENERIC on all 
> platforms? At the moment it is set for sun4v only.
> 
> Cheers
> Michiel
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> 

I think the fear is that it could cause a stack overflow because it 
allocates a character array (128-bytes in the above case) on the stack. 
  I would like to know how real this fear is though.  Clearly we do need 
a way to avoid interleaving console output by default.

Kris