AMD64 with 9.0 PRERELEASE freezing/hanging without any messages

Reed Loefgren rloefgren at
Sat Nov 19 15:40:34 UTC 2011

On 11/19/11 03:54, Jukka A. Ukkonen wrote:
> Hello,
> Has anyone else noticed a similar odd behavior with AMD64 and 9.0
> prerelease (as well as RCs and betas)?
> On my 12 core (2*4162EE) the whole system just freezes quite often
> without any warning, without any messages being logged. Neither is
> there any panic message from the kernel. The system just suddenly
> hangs such that there is no alternative but to reboot using the
> reset button.
> At the moment I don't have any further info about the cause of the
> problem, but quite often the freeze has happened when there has been
> some network activity.
> Does anyone have an idea how to start tracking down such a problem?
> I mean anything in addition to this...
> 	Cheers,
> 		// jau
> .---  ..-  -.-  -.-  .-    .-  .-.-.-    ..-  -.-  -.-  ---  -.  .  -.
>    /    Jukka A. Ukkonen,                             Oxit Ltd, Finland
>   /__   M.Sc. (sw-eng&  cs)                    (Phone) +358-500-606-671
>     /   Internet: Jukka.Ukkonen(a)Oxit.Fi
>    /    Internet: jau(a)
>   v
>          .---  .-  ..-  ...-.-  ..  -.-  ..  .-.-.-  ..-.  ..
> + + + + My opinions are mine and mine alone, not my employers. + + + +
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I experienced this a rather long time ago with an AMD X2600 (Barton?) 
processor. The machine would freeze when I did some rapid 
mousing/clicking in and out of a window. Nothing in the logs. If I 
stayed out of X things were just fine but this was my home machine and 
why should I have to stay out of X? I figured FBSD dev was just running 
behind the Intel dev and time would fix it. Or Xorg dev would even up. 
In any case it went away in the next release. It was never *that* much 
of a problem; consistent but not often. Your freezing appears to be more 
frequent than was mine. At this point in the release cycle I think the 
only issues they find are for weird corner cases. Perhaps you have one. 
Or it's hardware :( Try a different NIC for a while.


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