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Message-ID: <Pine.LNX.4.44L0.0702211621310.3435-100000@iolanthe.rowland.org> 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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