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Date: Tue, 29 Jul 2003 13:50:25 -0700
From: Andrew Morton <akpm@osdl.org>
To: Yaroslav Halchenko <yoh@onerussian.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.6.0-test2-bk3 phantom I/O errors
Message-Id: <20030729135025.335de3a0.akpm@osdl.org>
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Yaroslav Halchenko <yoh@onerussian.com> wrote:
>
> Buffer I/O error on device hda2, logical block 3861502
> Buffer I/O error on device hda2, logical block 3861504
> Buffer I/O error on device hda2, logical block 3861506

Odd.

> dmesg bears also signs about 
> buffer layer error at fs/buffer.c:416
> Call Trace:
>  [<c0154f30>] __find_get_block_slow+0x80/0xe0
>  [<c0155f51>] __find_get_block+0x91/0xf0

Yes, this mystery has been floating about for some time.

What filesystem types are in use?

Are you using some sort of initrd setup?

Could you please run with this patch, send the traces?

diff -puN fs/buffer.c~buffer-debug fs/buffer.c
--- 25/fs/buffer.c~buffer-debug	Tue Jul 29 12:11:59 2003
+++ 25-akpm/fs/buffer.c	Tue Jul 29 13:48:48 2003
@@ -163,6 +163,7 @@ static void buffer_io_error(struct buffe
 	printk(KERN_ERR "Buffer I/O error on device %s, logical block %Lu\n",
 			bdevname(bh->b_bdev, b),
 			(unsigned long long)bh->b_blocknr);
+	dump_stack();
 }
 
 /*
@@ -414,6 +415,9 @@ __find_get_block_slow(struct block_devic
 		bh = bh->b_this_page;
 	} while (bh != head);
 	buffer_error();
+	printk("block=%llu, b_blocknr=%llu\n",
+		(unsigned long long)block, (unsigned long long)bh->b_blocknr);
+	printk("b_state=0x%08lx, b_size=%u\n", bh->b_state, bh->b_size);
 out_unlock:
 	spin_unlock(&bd_mapping->private_lock);
 	page_cache_release(page);

_

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