Re: Hang running fs_mark

[Chris Mason <chris.mason@oracle.com>]

On Thu, 2008-09-25 at 16:37 -0400, Ric Wheeler wrote:
> Chris Mason wrote:
> > On Thu, 2008-09-25 at 14:34 -0400, Josef Bacik wrote:
> >   
> >> On Thu, Sep 25, 2008 at 02:37:02PM -0400, Chris Mason wrote:
> >>     
> >>> On Thu, 2008-09-25 at 13:56 -0400, Josef Bacik wrote:
> >>>       
> >>>> Hello,
> >>>>
> >>>> Reporting this on behalf of ric.  He was running the following fs_mark command
> >>>>
> >>>> ./fs_mark -d /mnt/test -s 20480 -D 64 -t 8 -F
> >>>>
> >>>> Seems it hung and wasn't making any progress.  He managed to get some sysrq-t,
> >>>> which is at http://people.redhat.com/jwhiter/fs-mark-hang.txt towards the bottom
> >>>> of the document.  He could ctrl+c and unmount the fs so its not a hard hang.
> >>>> Looks like we've just locked up behind a page lock somewhere.  I have to run off
> >>>> to class so I can't look into it too deeply so throwing this out there hoping
> >>>> somebody else figures it out :).  Thanks,
> >>>>         
> >>> Which kernel was this?

> It actually cleaned up very nicely after I killed the fs_mark processes 
> & unmounted the btrfs file system. Before doing that, the box was 
> sluggish and had the feeling of a system with something that might have 
> been spinning (but that is just an observation, not measured in any 
> strict sense).

Ok, I have that fs_mark test running here.  How far did yours get before
it stopped?

-chris