Date: Mon, 19 Oct 2009 13:50:50 +0200 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-stable@freebsd.org Subject: Re: Extreme console latency during disk IO (8.0-RC1, previous releases also affected according to others) Message-ID: <hbhjqf$sjk$3@ger.gmane.org> In-Reply-To: <hb6rhk$8t8$1@ger.gmane.org> References: <E316139E-FFCF-432F-8DCE-62B120C38E55@exscape.org> <CC16B639-7A75-4016-A8A8-5C59E9CD5E95@exscape.org> <hb1qs0$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> <hb6rhk$8t8$1@ger.gmane.org>
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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.
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