Re: [linux-usb-devel] 2.6.20 kernel hang with USB drive and vfatdoing ftruncate

From: Alan Stern
Date: Wed Feb 21 2007 - 16:23:31 EST

On Wed, 21 Feb 2007, Andrew Morton wrote:

> > > It seems like usb-storage and aio are completely off in the weeds.
> > > Ideas?
> >
> > It seems usb-storage should remove some kmalloc and use mempool() for
> > urb... Is someone working on this? And idea?
> I think Pete said that we're supposed to be using GFP_NOIO in there.

We _are_ using it.

> Not that it'll help much: the VM calls throttle_vm_writeout() for GFP_NOIO
> and GFP_NOFS allocations, which is a bug. Because if the caller holds
> locks which prevent filesystem or IO progress, we deadlock.
> I'll fix the VM if someone else fixes USB ;)

What else needs to be fixed?

Alan Stern

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