Fw: 2.6.27 & ext4 strangeness

Fw: 2.6.27 & ext4 strangeness

[Alex Buell]

Hi,

As this has happened three times in the last 24 hours, I thought I'd
report this. Whenever my laptop locks up, I have to powercycle. After
rebooting, and fsck.ext4 reports a clean filesystem, often I get a 'no
space on device' error even though I have plenty of disk space left.
Another reboot with a forced fsck.ext4 cures this, every time. This only
happens with ext4 filesystems used as the root filesystem. 
-- 
http://www.munted.org.uk

Fearsome grindings.

Re: Fw: 2.6.27 & ext4 strangeness

[Theodore Tso]

On Fri, Jan 30, 2009 at 07:47:02PM +0000, Alex Buell wrote:
> 
> As this has happened three times in the last 24 hours, I thought I'd
> report this. Whenever my laptop locks up, I have to powercycle. After
> rebooting, and fsck.ext4 reports a clean filesystem, often I get a 'no
> space on device' error even though I have plenty of disk space left.
> Another reboot with a forced fsck.ext4 cures this, every time. This only
> happens with ext4 filesystems used as the root filesystem. 

If you can reproduce this, can you send me the output of "df /; df -i
/; dumpe2fs /dev/XXX" (where XXX is your root device) before you
reboot and force an fsck?  And then can you send me the output of "df
/ ; df -i /; dumpe2fs /dev/XXX" after the 2nd reboot and forced fsck.
I've never seen anything like this, so I don't know what to make of it.

It also would be interesting to see if you can reproduce it running a
kernel from the ext4-stable branch of the ext4 tree:

   git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git
   http://git.kernel.org/?p=linux/kernel/git/tytso/ext4.git

This has all of the ext4 fixes that is in the latest mainline, based
on the 2.6.28 kernel.

Thanks for reporting your observations,

							- Ted

Re: 2.6.27 & ext4 strangeness

[Alex Buell]

On Fri, 30 Jan 2009 19:09:17 -0500, I waved a wand and this message
magically appears in front of Theodore Tso:

> On Fri, Jan 30, 2009 at 07:47:02PM +0000, Alex Buell wrote:
> > 
> > As this has happened three times in the last 24 hours, I thought I'd
> > report this. Whenever my laptop locks up, I have to powercycle.
> > After rebooting, and fsck.ext4 reports a clean filesystem, often I
> > get a 'no space on device' error even though I have plenty of disk
> > space left. Another reboot with a forced fsck.ext4 cures this,
> > every time. This only happens with ext4 filesystems used as the
> > root filesystem. 
> 
> If you can reproduce this, can you send me the output of "df /; df -i
> /; dumpe2fs /dev/XXX" (where XXX is your root device) before you
> reboot and force an fsck?  And then can you send me the output of "df
> / ; df -i /; dumpe2fs /dev/XXX" after the 2nd reboot and forced fsck.
> I've never seen anything like this, so I don't know what to make of
> it.

It's happened again this morning before your e-mail arrived. I'm now
sure I can reproduce it every time the laptop locks up. The next
time it happens I'll do as you request. 

Regards
Alex
-- 
http://www.munted.org.uk

Fearsome grindings.

Re: 2.6.27 & ext4 strangeness

[Alex Buell]

On Fri, 30 Jan 2009 19:09:17 -0500, I waved a wand and this message
magically appears in front of Theodore Tso:

> If you can reproduce this, can you send me the output of "df /; df -i
> /; dumpe2fs /dev/XXX" (where XXX is your root device) before you
> reboot and force an fsck?  And then can you send me the output of "df
> / ; df -i /; dumpe2fs /dev/XXX" after the 2nd reboot and forced fsck.
> I've never seen anything like this, so I don't know what to make of
> it.
> 
> It also would be interesting to see if you can reproduce it running a
> kernel from the ext4-stable branch of the ext4 tree:
> 
>    git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git
>    http://git.kernel.org/?p=linux/kernel/git/tytso/ext4.git
> 
> This has all of the ext4 fixes that is in the latest mainline, based
> on the 2.6.28 kernel.

I've not been able to reproduce this yet but when it happens again I
will drop you a email. I'm actually quite happy with ext4 ever since I
switched all my boxes over to that filesystem. 

Thanks.
-- 
http://www.munted.org.uk

Fearsome grindings.