linux-kernel - Re: mount stuck, khubd blocked

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Message-ID: <x49lijhyg58.fsf@segfault.boston.devel.redhat.com>
Date:	Wed, 20 Jun 2012 14:47:31 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Dima Tisnek <dimaqq@...il.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Jens Axboe <axboe@...nel.dk>,
	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

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++;
--
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