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

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Date:	Wed, 21 Feb 2007 16:22:17 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	<linux-usb-devel@...ts.sourceforge.net>,
	Pete Zaitcev <zaitcev@...hat.com>, Greg KH <gregkh@...e.de>,
	Kumar Gala <galak@...nel.crashing.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [linux-usb-devel] 2.6.20 kernel hang with USB drive and vfat
 doing ftruncate

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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