From owner-freebsd-hackers  Wed Jan 26 13:43:22 2000
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Date: Wed, 26 Jan 2000 14:07:51 -0800
From: Alfred Perlstein <bright@wintelcom.net>
To: Scott Hess <scott@avantgo.com>
Cc: freebsd-hackers@FreeBSD.ORG
Subject: Re: aio_read crashing certain kernels.
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References: <01b301bf6824$46e928a0$1e80000a@avantgo.com>
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* Scott Hess <scott@avantgo.com> [000126 10:08] wrote:
> Since nobody here seems to be able to figure it out... I wrote a program to
> play around with aio_read(), and it ran stellarly well on my
> FreeBSD3.4-release system using EIDE hard drives.  But, when I tried to run
> it on a system using our production kernel with Adaptec SCSI controllers,
> it locked the kernel up HARD.  No console messages, no Ctrl-Alt-Del, had to
> push the hard reset switch.
> 
> The kernel in question is a FreeBSD3.4-release kernel compiled with a
> different set of options (lots of mbufs, etc, etc).  I can't find anything
> in it that seems at all related to async I/O.  The appropriate sysctl
> values all seem the same between the systems.  And the fact that it locks
> the system up instead of saying ENOTSUPP or "async I/O not compiled in"
> concerns me greatly.
> 
> Any ideas on why this might be happening?

No, please provide a debug traceback and file a PR, see: 
http://www.freebsd.org/handbook/kerneldebug.html

thanks,
-Alfred


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