Re: 2.6.20 kernel hang with USB drive and vfat doing ftruncate

[Kumar Gala]

On Feb 19, 2007, at 4:19 PM, OGAWA Hirofumi wrote:

> Kumar Gala <galak@xxxxxxxxxxxxxxxxxxx> writes:
>
> > > > I usually run the following twice to get the hang state:
> > > >
> > > > time ./trunc_test bar 100000000 &
> > > > time ./trunc_test baz 100000000 &
> > > >
> > > > I was wondering if anyone had any suggestions on what to poke at  
> > > > next
> > > > to try and figure out what is going on.
> > >
> > > Can you check /sys/block/xxx/stat or something to make sure there is
> > > no outstanding IO request?
> > >
> > > It seems to be no response from the lower layer...
> >
> > Once the system locks up I dont have any ability to do anything.
>
> Ah, doesn't sysrq also work? If sysrq work, it can use to see IO
> request state with a patch.

Yeah, got sysrq working today.  If you can point me at the patch I  
happy to apply it and get data.

- k

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