Kernel 2.4.0 loop device still hangs

Kernel 2.4.0 loop device still hangs

[Mark Bratcher]

Hello,

I saw a post dated last fall 2000 sometime about the loop device hanging
when copying large amounts of data to a file mounted as, say, ext2fs. It
was in regard to kernel 2.4.0test-something.

I have the latest 2.4.0 kernel loaded on my system and this bug appears
to be there, although I have seen other notes that claim that it is
fixed.

Can anyone confirm whether this bug is "officially" known to be in the
official 2.4.0 kernel? Currently I have to reboot to 2.2.17 to do my
CD-RW backups.

Thanks.
-- 
Mark Bratcher
mailto:mbratche@rochester.rr.com
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Re: Kernel 2.4.0 loop device still hangs

[qkholland]

In article <fa.hl5rjsv.1b78u0u@ifi.uio.no>,
  Mark Bratcher <mbratche@rochester.rr.com> wrote:
> I saw a post dated last fall 2000 sometime about the
> loop device hanging when copying large amounts of data
> to a file mounted as, say, ext2fs.

I've recently reported a similar problem and told by
Jens Axboe at SUSE that it is still there, and appears
to be generic (not hardware nor kernel configuration
specific) problem.
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Re: Kernel 2.4.0 loop device still hangs

[Jens Axboe]

On Fri, Jan 26 2001, qkholland@my-deja.com wrote:
>   Mark Bratcher <mbratche@rochester.rr.com> wrote:
> > I saw a post dated last fall 2000 sometime about the
> > loop device hanging when copying large amounts of data
> > to a file mounted as, say, ext2fs.
> 
> I've recently reported a similar problem and told by
> Jens Axboe at SUSE that it is still there, and appears
> to be generic (not hardware nor kernel configuration
> specific) problem.

Yes, and please try:

*.kernel.org/pub/linux/kernel/people/axboe/patches/2.4.1-pre10/loop-3

and see if you can reproduce.

-- 
* Jens Axboe <axboe@suse.de>
* SuSE Labs
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Re: Kernel 2.4.0 loop device still hangs

[Mark Bratcher]

Hey all,

I applied the patch "loop-3", from Jen Axboe's 2.4.1-pre10 version, to
my 2.4.0 kernel as Jen had suggested we try for the loop device hang
problem.

This patch appears to have gotten rid of the problem (at least after
testing it once in my previous scenario, which would normally fail 100%
of the time on 2.4.0 official).

Thanks Jen!

Can I continue running this patch on 2.4.0 with impunity, or do I need
to be careful of anything else? :-)

Mark

Mark Bratcher wrote:
> 
> Hello,
> 
> I saw a post dated last fall 2000 sometime about the loop device hanging
> when copying large amounts of data to a file mounted as, say, ext2fs. It
> was in regard to kernel 2.4.0test-something.
> 
> I have the latest 2.4.0 kernel loaded on my system and this bug appears
> to be there, although I have seen other notes that claim that it is
> fixed.
> 
> Can anyone confirm whether this bug is "officially" known to be in the
> official 2.4.0 kernel? Currently I have to reboot to 2.2.17 to do my
> CD-RW backups.
> 
> Thanks.

-- 
Mark Bratcher
mailto:mbratche@rochester.rr.com
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Re: Kernel 2.4.0 loop device still hangs

[Jens Axboe]

On Sat, Jan 27 2001, Mark Bratcher wrote:
> Hey all,
> 
> I applied the patch "loop-3", from Jen Axboe's 2.4.1-pre10 version, to
> my 2.4.0 kernel as Jen had suggested we try for the loop device hang
> problem.
> 
> This patch appears to have gotten rid of the problem (at least after
> testing it once in my previous scenario, which would normally fail 100%
> of the time on 2.4.0 official).
> 
> Thanks Jen!

First of all, I'm all man (not up for debate) so it's Jens not Jen :-)

> Can I continue running this patch on 2.4.0 with impunity, or do I need
> to be careful of anything else? :-)

It should be safe. Thanks for the feedback.

-- 
* Jens Axboe <axboe@suse.de>
* SuSE Labs
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Re: Kernel 2.4.0 loop device still hangs

[Mark Bratcher]

Jens Axboe wrote:
[snip]
> 
> First of all, I'm all man (not up for debate) so it's Jens not Jen :-)
> 
[snip]

Doh! I beg your pardon. I must be blind. 8-) 8-)

Mark
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Re: Kernel 2.4.0 loop device still hangs

[Mircea Damian]

On Sun, Jan 28, 2001 at 03:43:00AM +0100, Jens Axboe wrote:
> 
> It should be safe. Thanks for the feedback.


The patch works fine here too, but I have not tested it very hard ... just
normal read/write small/big files into it.

It looks fine here.

Any thoughts to integrate it into 2.4.1? What's Linus opinion?

-- 
Mircea Damian
E-mails: dmircea@kappa.ro, dmircea@roedu.net
WebPage: http://taz.mania.k.ro/~dmircea/
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Re: Kernel 2.4.0 loop device still hangs

[Andreas Franck]

Hi Jens,

I've tested your patch quite as heavy as it gets: I created 5 files of each 
100 MB, set up 5 loop devices and made a RAID5 array out of them, putting 
ext2 on it and running a bonnie loop with 350 MB test size over it for the 
night.

Everything survived, worked flawlessly and I'm happy my disk did too :-)
Many thanks for the fine work!

Greetings,
Andreas

-- 
->>>----------------------- Andreas Franck --------<<<-
---<<<---- Andreas.Franck@post.rwth-aachen.de --->>>---
->>>---- Keep smiling! ----------------------------<<<-
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Re: Kernel 2.4.0 loop device still hangs

[Jens Axboe]

On Sun, Jan 28 2001, Andreas Franck wrote:
> Hi Jens,
> 
> I've tested your patch quite as heavy as it gets: I created 5 files of each 
> 100 MB, set up 5 loop devices and made a RAID5 array out of them, putting 
> ext2 on it and running a bonnie loop with 350 MB test size over it for the 
> night.
> 
> Everything survived, worked flawlessly and I'm happy my disk did too :-)
> Many thanks for the fine work!

Thanks for the testing, it does indeed look promising if it survives
a beating like that :-)

-- 
* Jens Axboe <axboe@suse.de>
* SuSE Labs
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