linux-kernel - Re: mount stuck, khubd blocked

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Date:	Mon, 23 Jul 2012 15:07:24 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Jeff Moyer <jmoyer@...hat.com>
cc:	Dima Tisnek <dimaqq@...il.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Jens Axboe <axboe@...nel.dk>, <amethyst623@....com>,
	USB list <linux-usb@...r.kernel.org>,
	<linux-fsdevel@...r.kernel.org>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: mount stuck, khubd blocked

On Wed, 20 Jun 2012, Jeff Moyer wrote:

> Alan Stern <stern@...land.harvard.edu> writes:
> 
> > On Tue, 19 Jun 2012, Dima Tisnek wrote:
> >
> >> I made a microsd flash with 2 partitions, sdb1 is data partition, and
> >> sdb2 is a sentinel partition, 1 block in size.
> >> 
> >> I attached the usb-microsd reader with that card in it and by mistake
> >> tried to mount the sentinel partition, I ran:
> >> mount /dev/sdb2 /mnt/flash/
> >> 
> >> mount got stuck, I was not able to kill or strace it, I pulled the usb
> >> reader from the port, mount was still stuck, here's the dmesg log:
> 
> Hi, Dima,
> 
> Could you try the following patch?
> 
> Thanks,
> Jeff
> 
> diff --git a/fs/buffer.c b/fs/buffer.c
> index 838a9cf..769b30b 100644
> --- a/fs/buffer.c
> +++ b/fs/buffer.c
> @@ -930,7 +930,7 @@ init_page_buffers(struct page *page, struct block_device *bdev,
>  			bh->b_blocknr = block;
>  			if (uptodate)
>  				set_buffer_uptodate(bh);
> -			if (block < end_block)
> +			if (block <= end_block)
>  				set_buffer_mapped(bh);
>  		}
>  		block++;

Jeff, does this also fix Bugzilla #43269?

Alan Stern

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