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Re: [Qemu-devel] rbd: Possible regression in 2.9 RCs

From: Eric Blake
Subject: Re: [Qemu-devel] rbd: Possible regression in 2.9 RCs
Date: Thu, 30 Mar 2017 19:39:50 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0

On 03/30/2017 06:42 PM, Alexandru Avadanii wrote:
> Hi,
> While testing out 2.9.0-rc2 on AArch64, we noticed a possible regression in 
> QEMU, related to parsing -drive 'file=rbd/...':
>> "conf option 6789 has no value".
> Instance logs [1].

Pastebins don't last forever; it helps to paste the actual error message
in the email for archival purposes, and to make it easier for readers to
see your problem without having to chase URLs:

2017-03-30T20:02:27.499695Z qemu-system-aarch64: -drive
conf option 6789 has no value

Looking at that, the only instance of 6789 that I see is the
'mon_host=\:6789,' portion.  I bet what is happening is that
we are mis-parsing the string, and trying to treat it as a key-values
pair.  In other words, it's probably an unintended regression introduced
in the range of 7830f909..0a55679b by Jeff [3] or in Markus' cleanups
between f51c363c..2836284d [4].

On the bright side, we still have time to fix it before 2.9 goes final,
now that you called it to our attention.

> Occasionally, we get "conf option too long", with the same effect.
> We bisected this manually between 2.8.0 (working ok with the above cmd) and 
> 2.9.0-rc2, and the problematic change seems to be the merge point [2].

I suspect you didn't run the bisect quite correctly, as that merge point
has nothing to do with block/rbd.c.

> [1] http://paste.openstack.org/show/604938/
> [2] https://github.com/qemu/qemu/commit/9a81b79

[3] https://lists.gnu.org/archive/html/qemu-devel/2017-02/msg07506.html
[4] https://lists.gnu.org/archive/html/qemu-devel/2017-03/msg05565.html

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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