Date: Fri, 15 Jun 2007 14:25:21 -0400 From: Kris Kennaway <kris@obsecurity.org> To: Benjamin Close <Benjamin.Close@clearchain.com> Cc: freebsd-current@freebsd.org Subject: Re: Swapfile on ZFS & Deadlock Message-ID: <20070615182521.GB9619@rot13.obsecurity.org> In-Reply-To: <4672945C.3060304@clearchain.com> References: <4672945C.3060304@clearchain.com>
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[-- Attachment #1 --] On Fri, Jun 15, 2007 at 11:00:04PM +0930, Benjamin Close wrote: > Hi All, > Whilst running out of memory compiling Xorg (scanPCI is a killer) I > discovered a quick way to deadlock the system: > > dd if=/dev/zero of=somefileonzfs bs=something count=something > mdconfig -a -f something > swapon /dev/md0 > > Then do something that needs swap.. instant deadlock. The system is > still responsive but all disk access become hung. > > Known issue? If so is there a way we can warn users/prevent users from > doing it? Enable DEBUG_VFS_LOCKS and DEBUG_LOCKS, then break to DDB when the deadlock occurs and do 'show lockedvnods'. Kris [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.3 (FreeBSD) iD8DBQFGctmRWry0BWjoQKURAsidAJwLaPKf9Fsjcb3/bL1xaBdgmWKfgACeO7vP vXSNYoA0poAnJcjHGb3W8+I= =ZarY -----END PGP SIGNATURE-----help
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