linux-kernel - RE: [Bug 25832] kernel crashes when a mounted ext3/4 file system is physically removed

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Date:	Mon, 19 Sep 2011 00:00:18 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Alan Stern <stern@...land.harvard.edu>,
	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	Rocko Requin <rockorequin@...mail.com>, tytso@....edu,
	Kernel development list <linux-kernel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>
Subject: RE: [Bug 25832] kernel crashes when a mounted ext3/4 file system is
 physically removed

On Sat, 2011-09-17 at 13:34 -0400, Alan Stern wrote:
> On Sat, 17 Sep 2011, Rocko Requin wrote:
> 
> > > Why were you using gnome-terminal?  You should be running the tests at
> > > a console VT, not under X at all.  Ctrl-Alt-F2 or the equivalent...
> > 
> > Because with Ted's patch it doesn't crash when run from a console VT, even with an X server running.
> 
> That's weird.  Maybe the screen updates change some timing.
> 
> > > Here's another patch to address the new problem.  You can apply it on 
> > > top of all the other patches.
> > 
> > Attached is the crash log I get with the latest patch applied.
> 
> Okay, more fallout from the same problem.  Here's an updated version of 
> the previous patch.
[...]

There have been reports of this in Debian going back to 2.6.39:

http://bugs.debian.org/631187
http://bugs.debian.org/636263
http://bugs.debian.org/642043

Plus possibly related crashes in elv_put_request after CD-ROM removal:

http://bugs.debian.org/633890
http://bugs.debian.org/634681
http://bugs.debian.org/636103

The former was also reported in Ubuntu since their 2.6.38-10:

https://bugs.launchpad.net/debian/+source/linux-2.6/+bug/793796

The result of the discussion there was that it appeared to be a
regression due to commit 86cbfb5607d4b81b1a993ff689bbd2addd5d3a9b 
("[SCSI] put stricter guards on queue dead checks") which was also
included in a stable update for 2.6.38.

There was also a report on bugzilla.kernel.org, though no-one can see
quite what that says now:

https://bugzilla.kernel.org/show_bug.cgi?id=38842

I also reported most of the above to James Bottomley and linux-scsi
nearly 2 months ago, to no response.

Ben.

-- 
Ben Hutchings
Power corrupts.  Absolute power is kind of neat.
                           - John Lehman, Secretary of the US Navy 1981-1987

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