linux-kernel - [jet.chen@...el.com: [bio] kernel BUG at drivers/block/virtio

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Date:	Mon, 26 May 2014 21:43:47 +0200
From:	Maurizio Lombardi <mlombard@...hat.com>
To:	axboe@...nel.dk
Cc:	jet.chen@...el.com, Stephen Rothwell <sfr@...b.auug.org.au>,
	LKML <linux-kernel@...r.kernel.org>, lkp@...org,
	Fengguang Wu <fengguang.wu@...el.com>
Subject: [jet.chen@...el.com: [bio] kernel BUG at
 drivers/block/virtio_blk.c:166!]

Hi Jens,

looks like that commit 3979ef4dcf3d1de55a560a3a4016c30a835df44d ("bio-modify-__bio_add_page-to-accept-pages-that-dont-start-a-new-segment-v3")
introduces a regression, as reported by Jet Chan.

Do you have any idea about the possible problem with this patch?

it is the one that performs a recount of the segments in case of failure in __bio_add_page()

http://www.spinics.net/lists/mm-commits/msg103684.html

I would not be surprised if the bug was introduced by fceb38f36f, because it
contained a mystake that commit 3979ef4dcf supposedly fixed.
But learning that commit 3979ef4dcf is introducing a regression leaves
me quite puzzled.

Thanks,
Maurizio Lombardi

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