| To: | Nick Piggin <npiggin@xxxxxxx> |
|---|---|
| Subject: | Re: BUG: soft lockup - is this XFS problem? |
| From: | Christoph Hellwig <hch@xxxxxxxxxxxxx> |
| Date: | Sat, 3 Jan 2009 16:44:43 -0500 |
| Cc: | Peter Klotz <peter.klotz@xxxxxx>, Roman Kononov <kernel@xxxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx |
| In-reply-to: | <20081230042333.GC27679@wotan.suse.de> |
| References: | <gifgp1$8ic$1@ger.gmane.org> <20081223171259.GA11945@infradead.org> <20081230042333.GC27679@wotan.suse.de> |
| User-agent: | Mutt/1.5.18 (2008-05-17) |
On Tue, Dec 30, 2008 at 05:23:33AM +0100, Nick Piggin wrote: > On Tue, Dec 23, 2008 at 12:12:59PM -0500, Christoph Hellwig wrote: > > > > Nick, I've seen various reports like this by Roman. It seems to be > > caused by an interaction of the lockless pagecache with the xfs > > I/O code. Any idea what might be wrong here: > > Hmm, it could get into a loop here if there is a page in the pagecache > with a zero refcount, which might be a problem with XFS... other looping > conditions might indicate a problem iwth lockless pagecache or radix > tree. It would be very helpful to know what condition it is looping on... See http://oss.sgi.com/bugzilla/show_bug.cgi?id=805 |
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