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Re: [Qemu-block] [PATCH v4 for 2.12 0/3] fix bitmaps migration through s

From: Max Reitz
Subject: Re: [Qemu-block] [PATCH v4 for 2.12 0/3] fix bitmaps migration through shared storage
Date: Mon, 26 Mar 2018 20:06:54 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0

On 2018-03-20 18:05, Vladimir Sementsov-Ogievskiy wrote:
> Hi all.
> This fixes bitmaps migration through shared storage. Look at 02 for
> details.
> The bug introduced in 2.10 with the whole qcow2 bitmaps feature, so
> qemu-stable in CC. However I doubt that someone really suffered from this.
> Do we need dirty bitmaps at all in inactive case? - that was a question in v2.
> And, keeping in mind that we are going to use inactive mode not only for
> incoming migration, I'm not sure that answer is NO (but, it may be "NO" for 
> 2.10, 2.11), so let's fix it in proposed here manner at least for 2.12.

For some reason, I can't get 169 to work now at all[1].  What's more,
whenever I run it, two (on current master, maybe more after this series)
"cat $TEST_DIR/mig_file" processes stay around.  That doesn't seem right.

However, this series doesn't seem to make it worse[2]...  So I'm keeping
it.  I suppose it's just some issue with the test.


[1] Sometimes there are migration even timeouts, sometimes just VM
launch timeouts (specifically when VM B is supposed to be re-launched
just after it has been shut down), and sometimes I get a dirty bitmap
hash mismatch.

[2] The whole timeline was:

- Apply this series, everything seems alright

(a couple of hours later)
- Test some other things, stumble over 169 once or so

- Focus on 169, fails a bit more often

- Can't get it to work at all

- Can't get it to work in any version, neither before nor after this patch

- Lose my sanity

- Write this email


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