kern/79208: Deadlock or starvation doing heavy NFS writes with writev

[Marc Olzheim]

The following reply was made to PR kern/79208; it has been noted by GNATS.

From: Marc Olzheim <zlo at zlo.nu>
To: FreeBSD-gnats-submit at FreeBSD.org, freebsd-bugs at FreeBSD.org
Cc: Marc Olzheim <zlo at zlo.nu>, sven at berkvens.net
Subject: Re: kern/79208: Deadlock or starvation doing heavy NFS writes with writev
Date: Fri, 25 Mar 2005 14:12:13 +0100

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 On a FreeBSD 6.0-CURRENT (Fri Mar 25 11:09:51 CET 2005) machine,
 the same happens.
 
 This machine has less memory 512 MB instead of 4GB, so the limit is
 lower than 60 MB: 31 MB is enough. It produces a file of 31506432 bytes
 on the NFS server, during which the machine becomes unresponsive and
 then never recovers.
 
 ping/ping6 still works, but that's all. Power cycling the machine is all
 that's left...
 
 Oh yeah, forgot to mention: this is as mortal user, not as root, so it's
 a simple local Denial of Service attack. :-(
 
 On FreeBSD-4.11 it works as expected, no hangs.
 
 Marc
 
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