Date: Wed, 23 Apr 2008 22:37:35 +0200 From: Dominic Fandrey <kamikaze@bsdforen.de> To: Bruce Evans <brde@optusnet.com.au> Cc: freebsd-bugs@FreeBSD.org, gavin@FreeBSD.org, bug-followup@FreeBSD.org Subject: Re: kern/122961: write operation on msdosfs file system causes panic Message-ID: <480F9E0F.3010803@bsdforen.de> In-Reply-To: <20080423110846.I67125@delplex.bde.org> References: <200804211445.m3LEjNh6018941@freefall.freebsd.org> <480CC6F4.1000200@bsdforen.de> <20080422084732.H63563@delplex.bde.org> <480E1F9E.5070308@bsdforen.de> <20080423110846.I67125@delplex.bde.org>
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Bruce Evans wrote: > On Tue, 22 Apr 2008, Dominic Fandrey wrote: > >> Bruce Evans wrote: >>> On Mon, 21 Apr 2008, Dominic Fandrey wrote: >>> This seems to be a bug in usb (umass) or the particular usb drive... >>> ... >>> >>> To check that this is the bug, mount msdosfs with -o >>> noclusterr,noclusterw >>> under RELENG_7 or later (the bug also affects RELENG_6, but these mount >>> options are broken in RELENG_6). ... >> >> # mount -t msdosfs -o >> noatime,noexec,-L=en_GB.UTF-8,noclusterr,noclusterw /dev/da0 /mnt/tmp >> mount_msdosfs: /dev/da0: mount option <noclusterw> is unknown: Invalid >> argument >> >> It seems they are also broken under RELENG_7 from the day before >> yesterday. > > Oops, it is indeed broken there too. msdosfs in RELENG_7 is in the state > that I thought RELENG_6 was in (missing critical MFCs only for nocluster* > in the options list and to fix panics related to the dirty flag), while > msdosfs in RELENG_6 is just too old to support clustering. > > The broken nocluster* can be worked around by upgrading to a version of > mount_msdsosfs(8) that hasn't been broken by using nmount(2). > mount_msdsosfs(8) from RELENG_5 should work. I feel reluctant about downgrading to 5.x mount_msdosfs, however I can confirm that cp with large files does _not_ cause a panic. As far as I understand this confirms your theory. How can I provide more useful information?
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