linux-kernel - Re: -tip: origin tree boot crash

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Message-ID: <20091217094448.GB12228@elte.hu>
Date:	Thu, 17 Dec 2009 10:44:48 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Christoph Hellwig <hch@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Chinner <david@...morbit.com>,
	Badari Pulavarty <pbadari@...ibm.com>,
	Jeff Moyer <jmoyer@...hat.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Zach Brown <zach.brown@...cle.com>,
	Alex Elder <aelder@....com>, Mark Fasheh <mfasheh@...e.com>,
	Joel Becker <joel.becker@...cle.com>
Subject: Re: -tip: origin tree boot crash


* Al Viro <viro@...IV.linux.org.uk> wrote:

> On Thu, Dec 17, 2009 at 10:02:50AM +0100, Ingo Molnar wrote:
> > 
> > Today's -tip crashes during bootup on one of my testsystems, and i've bisected 
> > it back to this commit:
> > 
> > | 5fe878ae7f82fbf0830dbfaee4c5ca18f3aee442 is the first bad commit
> > | commit 5fe878ae7f82fbf0830dbfaee4c5ca18f3aee442
> > | Author: Christoph Hellwig <hch@....de>
> > | Date:   Tue Dec 15 16:47:50 2009 -0800
> > |
> > |    direct-io: cleanup blockdev_direct_IO locking
> > |
> > |    Currently the locking in blockdev_direct_IO is a mess, we have three
> > |    different locking types and very confusing checks for some of them.  The
> > |    most complicated one is DIO_OWN_LOCKING for reads, which happens to not
> > |    actually be used.
> > 
> > I have no bootlog available currently. The kernel config is attached.
> > 
> > I've reverted the patch from -tip for now.
> 
> How about this:
> 
> diff --git a/fs/direct-io.c b/fs/direct-io.c
> index 4012885..e82adc2 100644
> --- a/fs/direct-io.c
> +++ b/fs/direct-io.c
> @@ -1206,7 +1206,7 @@ __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
>  	 * NOTE: filesystems with their own locking have to handle this
>  	 * on their own.
>  	 */
> -	if (dio->flags & DIO_LOCKING) {
> +	if (flags & DIO_LOCKING) {
>  		if (unlikely((rw & WRITE) && retval < 0)) {
>  			loff_t isize = i_size_read(inode);
>  			if (end > isize)

thanks, will check this.

	Ingo
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