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Re: [Qemu-devel] Regression from 2.8: stuck in bdrv_drain()

From: Eric Blake
Subject: Re: [Qemu-devel] Regression from 2.8: stuck in bdrv_drain()
Date: Thu, 13 Apr 2017 09:33:06 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0

On 04/13/2017 04:48 AM, Peter Maydell wrote:
> On 13 April 2017 at 00:54, Fam Zheng <address@hidden> wrote:
>> John and I confirmed that this can be fixed by this pending patch:
>> [PATCH for-2.9 4/5] block: Drain BH in bdrv_drained_begin
>> https://lists.gnu.org/archive/html/qemu-devel/2017-04/msg01018.html
>> It didn't make it into 2.9-rc4 because of limited time. :(
>> Looks like there is no -rc5, we'll have to document this as a known issue.
> Well, we *hope* there is no -rc5, but if the bug is genuinely
> a "we can't release like this" bug we will obviously have to
> do another rc. Basically you all as the block maintainers should
> make the call about whether it's release-critical or not.

Just curious: is there a technical reason we couldn't spin an -rc5 today
(with just the fix to this issue), and slip the schedule only by two
days instead of a full week?  And/or shorten the time for testing -rc5
from the usual 7 days into 5?

I don't know what other constraints we have to play with, so feel free
to tell me that my idea is not feasible.  Also, while I'm a block layer
contributor, I'm not one of its co-maintainers, so I'd trust the replies
from others a bit more than mine when deciding what to do here.

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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