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Re: [Qemu-block] [Qemu-devel] [PATCH 0/4] Tweaks around virtio-blk start

From: TU BO
Subject: Re: [Qemu-block] [Qemu-devel] [PATCH 0/4] Tweaks around virtio-blk start/stop
Date: Mon, 21 Mar 2016 21:47:28 +0800
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:38.0) Gecko/20100101 Thunderbird/38.6.0

On 16/3/18 下午11:03, Paolo Bonzini wrote:

On 17/03/2016 17:08, Christian Borntraeger wrote:
Good (or bad?) news is the assert also triggers on F23, it just seems
to take longer.
I guess good news, because we can rule out the kernel (not that I
believed it was a kernel problem, but the thought is always there in
the background...).

The interaction between ioeventfd and dataplane is too complicated.  I
think if we get rid of the start/stop ioeventfd calls (just set up the
ioeventfd as soon as possible and then only set/clear the handlers)
things would be much simpler.

I'll see if I can produce something based on Conny's patches, which are
already a start.  Today I had a short day so I couldn't play with the
bug; out of curiosity, does the bug reproduce with her work + patch 4
from this series + the reentrancy assertion?
I did NOT see crash with qemu master + "[PATCH RFC 0/6] virtio: refactor host notifiers" from Conny + patch 4 + assertion. thx


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