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From: Ivan Voras <ivoras@freebsd.org>
Date: Mon, 19 Oct 2009 13:50:50 +0200
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References: <E316139E-FFCF-432F-8DCE-62B120C38E55@exscape.org>	<CC16B639-7A75-4016-A8A8-5C59E9CD5E95@exscape.org>	<hb1qs0$qjd$1@ger.gmane.org>	<alpine.BSF.2.00.0910131406340.26071@fledge.watson.org>	<9bbcef730910130633w150571a0k461fb4e67a51fb1d@mail.gmail.com>	<B5BA3ACC-BC06-4042-8434-0D9395A0F478@freebsd.org>	<hb23i7$opq$1@ger.gmane.org>	<alpine.BSF.2.00.0910130957540.26159@thebighonker.lerctr.org>	<9bbcef730910131057i71db846et1f0d4aeadef5e302@mail.gmail.com>
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Subject: Re: Extreme console latency during disk IO (8.0-RC1, previous   
 releases also affected according to others)
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Ivan Voras wrote:

> Another data point - the OS in the VM in question hanged today sometime 
> after 5 AM in the following way:
> 
>     * console nonresponsive (also to ctrl-alt-del)
>     * ssh login nonresponsive (timeout)
>     * ping works (!)
> 
> Judging by the last seen timestamp, the machine should have been in the 
> process of receiving rsync backups - so IO-bound.

It looks like something really could be fishy in this area, at least 
with VMWare. The same thing happened again, and I have an additional 
data point: I left 'top' running on the console and when I attached the 
VMWare console to the VM, the top was still running ok, but as soon as I 
hit a key on the keyboard, the OS console locked up. All other symptoms 
were as I enumerated above.