linux-kernel - Re: 2.4.24-rc1-git: crash on shutdown/unmount?

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Date:	Thu, 1 Nov 2007 11:51:09 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Alistair John Strachan <alistair@...zero.co.uk>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	lkml@...breakpoint.cc
Subject: Re: 2.4.24-rc1-git: crash on shutdown/unmount?

On Wed, Oct 31 2007, Alistair John Strachan wrote:
> Hi Jens,
> 
> I guessed from the oops that you might have an idea what's causing this oops 
> on shutdown/unmount. The git version (describe), a screenshot showing the 
> oops, a config, and dmesg for a booted kernel are available from:
> 
> http://devzero.co.uk/~alistair/oops-20071031/
> 
> I went back to -rc1 and it still happens there too. If you need any more 
> information or want me to bisect it, please let me know.

Does this work for you?

diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 54fd385..75c98d5 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -3221,6 +3221,7 @@ static inline void __generic_make_request(struct bio *bio)
 	sector_t old_sector;
 	int ret, nr_sectors = bio_sectors(bio);
 	dev_t old_dev;
+	int err = -EIO;
 
 	might_sleep();
 
@@ -3248,7 +3249,7 @@ static inline void __generic_make_request(struct bio *bio)
 				bdevname(bio->bi_bdev, b),
 				(long long) bio->bi_sector);
 end_io:
-			bio_endio(bio, -EIO);
+			bio_endio(bio, err);
 			break;
 		}
 
@@ -3283,6 +3284,10 @@ end_io:
 
 		if (bio_check_eod(bio, nr_sectors))
 			goto end_io;
+		if (bio_empty_barrier(bio) && !q->prepare_flush_fn) {
+			err = -EOPNOTSUPP;
+			goto end_io;
+		}
 
 		ret = q->make_request_fn(q, bio);
 	} while (ret);

-- 
Jens Axboe

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