linux-kernel - Re: [PATCH v2 2/7] block: rewrite __bio_copy

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Message-ID: <20150116115845.GB22882@posteo.de>
Date:	Fri, 16 Jan 2015 12:58:45 +0100
From:	Dongsu Park <dongsu.park@...fitbricks.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	linux-kernel@...r.kernel.org, Kent Overstreet <kmo@...erainc.com>,
	Jens Axboe <axboe@...nel.dk>, Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH v2 2/7] block: rewrite __bio_copy_iov()

Hi Christoph,

On 16.01.2015 03:31, Christoph Hellwig wrote:
> On Thu, Jan 15, 2015 at 10:18:17AM -0800, Christoph Hellwig wrote:
> > This breaks booting a simple KVM VM for me:
> Seems like the issue actually is in the patch before this one, but
> only shows up with this one applied.
> The root cause is that we only copy the iov_iter, but not the
> actual iovecs into the bio_map_data.
> I have a fixed series, which I'll send out together with various
> related cleanups ASAP.

Thanks for testing it and finding out the root cause.
Strange, I haven't never seen the bug.
Maybe I'd have to test it also with virtio-scsi, which I don't do usually.

Dongsu
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