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Re: [Qemu-devel] [PATCH 5/8] virtio-blk: fix "disabled data plane" mode

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH 5/8] virtio-blk: fix "disabled data plane" mode
Date: Wed, 9 Mar 2016 17:17:31 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0

On 09/03/2016 15:29, Christian Borntraeger wrote:
> FWIW, it seems that this patch triggers this error, the 
> "tracked_request_begin"
> that I reported yesterday and / or some early read issues from the bootloader
> in a random fashion.
> Using 2906cddfecff21af20eedab43288b485a679f9ac^ seems to work all the time,
> moving around vblk->dataplane_started = true also triggers all 3 types
> of bugs

In all likelihood, the bug is that virtio_blk_handle_output is being
called in two threads.

It's not clear to me how that's possible, though.


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