Date: Sat, 2 Aug 2003 19:09:31 +0300 From: Ruslan Ermilov <ru@FreeBSD.org> To: Bruce Cran <bruce@cran.org.uk> Cc: Poul-Henning Kamp <phk@FreeBSD.org> Subject: Re: MSDOSFS woes Message-ID: <20030802160931.GB25355@sunbay.com> In-Reply-To: <20030802160045.GA40233@buffy.brucec.backnet> References: <20030802150850.GB20186@sunbay.com> <20030802160045.GA40233@buffy.brucec.backnet>
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[-- Attachment #1 --] On Sat, Aug 02, 2003 at 05:00:45PM +0100, Bruce Cran wrote: > On Sat, Aug 02, 2003 at 06:08:50PM +0300, Ruslan Ermilov wrote: > > Gang, :-) > > > > While working with Marcel on a bootable CD-ROM for IA64 issue, > > I've stumbled upon the following problem. I needed to increase > > the size of the EFI partition (which is an MS-DOS file system) > > to 64M, and that made two of my machines stuck solidly -- a lot > > of process are waiting on the "wdrain" event. > > > > The issue is not IA64 specific, both machines in question are > > i386. The following script makes my machines unhappy: > > > > EFISZ=131072 > > dd if=/dev/zero of=$BASE/$EFIPART count=$EFISZ > > md=`mdconfig -a -t vnode -f $BASE/$EFIPART` > > newfs_msdos -F 12 -S 512 -h 4 -o 0 -s $EFISZ -u 16 $md > > mount -t msdosfs /dev/$md /mnt > > dd if=/dev/zero of=/mnt/foo > > > > Changing to the -F 16 does not take any (good) effect. > > Anyone is interested in narrowing it down? > > > > I've also seen this happening on my Athlon XP system running -CURRENT. I > presumed it was the deadlock in vnode-backed md disks. It seems that when > a lot of disk activity occurs on the md partition, the process stops - > this is on a 30GB image containing UFS2 partitions /dev/md0s1[a,d,e]. > Attempting to reboot results in the message 'processes would not die - ps > axl advised', I had to reset the computer because nothing more happened. > Yes, the same here. And I have just been able to reproduce this with only a 16MB MS-DOS file system on a vnode backed md(4) device. Cheers, -- Ruslan Ermilov Sysadmin and DBA, ru@sunbay.com Sunbay Software Ltd, ru@FreeBSD.org FreeBSD committer [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (FreeBSD) iD8DBQE/K+I7Ukv4P6juNwoRAseOAJsEZE+DfNJy5h2Lcuji1G53y3jVYQCfRfL3 Z+3/wKVl3VDZb3NLtTuvZxI= =oUwU -----END PGP SIGNATURE-----
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