kern/79208: Deadlock or starvation doing heavy NFS writes with
writev
Marc Olzheim
zlo at zlo.nu
Fri Mar 25 05:20:06 PST 2005
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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