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Date: Sat, 13 Oct 2001 19:36:35 -0700
From: Matthew Dharm <mdharm-kernel@one-eyed-alien.net>
To: Alexander Viro <viro@math.psu.edu>
Cc: Ed Tomlinson <tomlins@CAM.ORG>, linux-kernel@vger.kernel.org
Subject: Re: mount hanging 2.4.12
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Media change is broken for the SDDR-09 driver.  That's why it's
experimental, among other reasons.

Don't worry about that, but if you've got a non-media change related
problem, then I would look at that.

Matt

On Sat, Oct 13, 2001 at 10:01:06PM -0400, Alexander Viro wrote:
>=20
>=20
> On Sat, 13 Oct 2001, Ed Tomlinson wrote:
>=20
> > Oct 13 19:28:31 oscar kernel: usb-uhci.c: interrupt, status 2, frame# 1=
147
> > Oct 13 19:28:31 oscar kernel:  I/O error: dev 08:01, sector 0
> > Oct 13 19:28:31 oscar kernel: FAT: unable to read boot sector
> > Oct 13 19:28:31 oscar kernel: VFS: Disk change detected on device sd(8,=
1)
> > Oct 13 19:28:31 oscar kernel: SCSI device sda: 131072 512-byte hdwr sec=
tors (67 MB)
> > Oct 13 19:28:31 oscar kernel: sda: Write Protect is on
> > Oct 13 19:28:31 oscar kernel:  sda: sda1
> >=20
> > The device is a usb smartmedia reader using the sddr-09 support.
>=20
> OK, looks like:
> 	a) ->check_media_change() is screwed for that device.
> 	b) we are hanging on something interesting.  It isn't ->s_umount
> and it's very unlikely to be ->s_lock or mount_sem.  What it might be,
> though... I suspect that ->bd_sem is screwed.
>=20
> 	Could you reproduce the hang and then do Alt-Sysrq-T?  That should
> give you stack traces.  I'm especially interested in stack trace of hung
> mount(8).  It's nice to know that it ends on down(), but knowing what had
> called that down() would help big way.
>=20
> -
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--=20
Matthew Dharm                              Home: mdharm-usb@one-eyed-alien.=
net=20
Maintainer, Linux USB Mass Storage Driver

NYET! The evil stops here!
					-- Pitr
User Friendly, 6/22/1998

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