Date: Fri, 24 Aug 2007 10:10:07 GMT From: "Rahul Siddharthan" <rsidd@online.fr> To: freebsd-usb@FreeBSD.org Subject: Re: usb/105361: [panic] Kernel panic during unmounting mass storage (Creative mp3 player) Message-ID: <200708241010.l7OAA7bl066026@freefall.freebsd.org>
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The following reply was made to PR usb/105361; it has been noted by GNATS.
From: "Rahul Siddharthan" <rsidd@online.fr>
To: bug-followup@freebsd.org, linimon@freebsd.org
Cc:
Subject: Re: usb/105361: [panic] Kernel panic during unmounting mass storage (Creative mp3 player)
Date: Fri, 24 Aug 2007 15:11:36 +0530
linimon wrote:
> Does this panic occur if you umnount the device before removal? (We are
> aware of the problem if a device is removed before unmounting).
I am experimenting with FreeBSD (7.0-CURRENT) after a few years. My
USB stick was not initialised by the system: it was recognised but no
device node was created. When I inserted and removed it a few times,
the system panicked. (As I said, there was no device node, so no mounting.)
I can submit a backtrace for this if anyone is interested.
I followed the suggested change to usb_subr.c here:
http://lists.freebsd.org/pipermail/freebsd-questions/2006-February/112698.html
and, after this, the system creates a da0 device, and
mount -t msdosfs /dev/da0s1 /mnt
works. I haven't yet got a panic by unmounting and removing, but removing
without unmounting does cause a panic still (as you say you are aware).
Other than this issue FreeBSD-7 seems remarkably stable so far. But this
problem with removable media has been around since floppy disk days, and
really seems to preclude using FreeBSD on any desktop machine where
uptime is important (eg, a compute workstation where long-term jobs
are running).
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