[GRLUG] weird mount thing

[John-Thomas Richards]

On Mon, Mar 07, 2011 at 10:28:29AM -0500, Michael Mol wrote:
> On Mon, Mar 7, 2011 at 10:18 AM, John-Thomas Richards <jtr at jrichards.org> wrote:
> > I attempted to unmount something earlier and it wouldn't unmount.  When
> > I did a `mount' I received this along with the usual stuff I expect to
> > see:
> >
> > /dev/sda6 on /home type ext3 (rw,commit=0,commit=600,commit=0,commit=600,commit=0,commit=600,commit=0,commit=600,commit=0,commit=600,commit=0,commit=600,commit=0,commit=600,commit=0,commit=600,commit=0,commit=600,commit=0,commit=600,commit=0,commit=600,commit=0,commit=600,commit=0,commit=600,commit=0,commit=600,commit=0,commit=600,commit=0,commit=0,commit=0,commit=600,commit=0,commit=600,commit=0,commit=600.......
> >
> > The `commit=0,commit=600' repeats many times.  I've never seen this
> > before.  Any ideas why I'm getting this?  None of the other mount points
> > do this (well, / shows `/dev/sda5 on / type ext3
> > (rw,errors=remount-ro,commit=0)').  Should I be concerned about
> > something?
> 
> That's clearly a bug somewhere. Even if there's a hardware issue
> somewhere, something would likely need to be screwed up in code for
> that kind of iterative listing error. You should report it to your
> distro's bugtracker for the package owning mount/umount.
> 
> I'd include:
> 
> * normal and 'strace' output for:
> ** mount
> ** umount /home
> * any seemingly-relevant lines in syslog in proximity to when that
> mount point was mounted, and  the same in proximity to when you
> attempted to unmount
> * The output of 'file -s /dev/sda6'.

root at rondo:/home/jtr# file -s /dev/sda6
/dev/sda6: Linux rev 1.0 ext3 filesystem data,\
UUID=991fdaf9-bdc1-4ef4-b00e-8627345bfdbe (needs journal recovery) (large files)

`needs journal recovery' sounds ominous.

> Finally, I'd try running fsck on the /dev/sda6, possibly from a
> different machine, after running smart tests on the drive, and include
> the output from those.

It's amazing how a quick answer from Mike can usher in a whole new sense
of humility.  :-)  After 14 years with Linux I know nothing.
-- 
john-thomas
------
If a person is obviously mentally disabled, such as having Down's
syndrome or Alzheimer's, decent people exercise sympathy and
understanding in their interactions. So why, if someone merely has a low
IQ, is he treated with ridicule and contempt?
Geoff Kuenning, computer science professor (1951- )

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