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?

> Its 2.6.25.14-108.fc9.x86_64 and its kernel-unstable since yesterday I think 
> he
> said, its just shy whatever patches you've pushed into git recently, it has
> yan's backref work plus a few other fixes.  Thanks,
> 

Well, the trace is strange because it looks like everyone is waiting on
IO.  Any chance once of the procs was spinning in system time?

-chris


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