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From: Robert Watson <rwatson@FreeBSD.org>
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To: Andrey Chernov <ache@freebsd.org>
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Cc: wpaul@ctr.columbia.edu, current@freebsd.org
Subject: Re: rl(4) is not ready for mpsafenet net enough? (silent reboots)
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On Thu, 21 Jul 2005, Andrey Chernov wrote:

> I got silent (without panic) reboots approx. every 4 hours running rl(4) 
> driver. When I turn off mpsafenet with debug.mpsafenet=0 reboots are 
> stopped. I have KASSERTS on, but none of them are triggered, just silent 
> hardware reboots. Plain UP machine. No netgraph, ipfw, etc. Any ideas?

I can't speak to the specifics of the driver, as I neither use it nor have 
any if_rl hardware.  However, you should know that because 
debug.mpsafenet=0 also changes quite a bit of timing, not just lock 
coverage, it's not necessarily a locking problem.  Out of curiousity, if 
you take "options PREEMPTION" out, but leave debug.mpsafenet=1, do things 
change?

Robert N M Watson