Date: Fri, 25 Mar 2005 13:20:05 GMT From: Marc Olzheim <zlo@zlo.nu> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/79208: Deadlock or starvation doing heavy NFS writes with writev Message-ID: <200503251320.j2PDK5rZ029819@freefall.freebsd.org>
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The following reply was made to PR kern/79208; it has been noted by GNATS. From: Marc Olzheim <zlo@zlo.nu> To: FreeBSD-gnats-submit@FreeBSD.org, freebsd-bugs@FreeBSD.org Cc: Marc Olzheim <zlo@zlo.nu>, sven@berkvens.net Subject: Re: kern/79208: Deadlock or starvation doing heavy NFS writes with writev Date: Fri, 25 Mar 2005 14:12:13 +0100 --TRYliJ5NKNqkz5bu Content-Type: text/plain; charset=us-ascii Content-Disposition: inline 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 --TRYliJ5NKNqkz5bu Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQFCRA4tezjnobFOgrERAqnUAJ96HLgAJVDPpcks01JbodFIlk/UGACgqCcI RTdiBc/Q1zXrriwideSu2Oc= =jF8g -----END PGP SIGNATURE----- --TRYliJ5NKNqkz5bu--
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