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Date: Tue, 6 Mar 2007 10:36:20 -0500 (EST)
From: Alan Stern <stern@...land.harvard.edu>
To: ebuddington@...leyan.edu, Oliver Neukum <oneukum@...e.de>
cc: USB development list <linux-usb-devel@...ts.sourceforge.net>,
Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [linux-usb-devel] khubd and ent:sda1 sucking CPU with reiser4
+ USB HD
On Tue, 6 Mar 2007, Oliver Neukum wrote:
> > Am Dienstag, 6. März 2007 05:13 schrieb Eric Buddington:
> > reiser4[khubd(163)]: commit_current_atom (fs/reiser4/txnmgr.c:1049)[nikita-3176]:
> > WARNING: Flushing like mad: 16384
> > reiser4[khubd(163)]: commit_current_atom (fs/reiser4/txnmgr.c:1049)[nikita-3176]:
> > WARNING: Flushing like mad: 32768
> > ...<many simiar messages>
> >
> > Most problematically, khubd and ent:sda1! are conspiring to suck 100%
> > CPU time, even after powering off the drive. A bunch of processes are
> > stuck in 'D' state, possibly because they're trying to access the dead
> > disk, which won't umount ("device is busy").
>
> It looks like khubd allocates memory and enters reiser4. Possibly we have
> GFP_KERNEL in khubd where we should have GFP_NOIO or reiser4 has
> a problem dealing with IO failures.
A more complete stack trace (for example, Alt-SysRq-T) would help.
Alan Stern
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