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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 13:55:27 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0

On 09/03/2016 13:21, Christian Borntraeger wrote:
> I have some random crashes at startup 
>                 Stack trace of thread 48326:
>                 #0  0x000002aa2e0cce46 bdrv_co_do_rw (qemu-system-s390x)
>                 #1  0x000002aa2e159e8e coroutine_trampoline 
> (qemu-system-s390x)
>                 #2  0x000003ffbc35150a __makecontext_ret (libc.so.6)
> that I was able to bisect.
> commit 2906cddfecff21af20eedab43288b485a679f9ac does crash regularly, 
> 2906cddfecff21af20eedab43288b485a679f9ac^ does not.
> I will try to find somebody that looks into that - unless you have an idea.

The only random idea is to move

    vblk->dataplane_started = true

to the beginning of virtio_blk_data_plane_start rather than the end.


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