Replay divergence with VMWare Fusion 8
robert at ocallahan.org
Wed Mar 2 19:37:53 UTC 2016
On Thu, Mar 3, 2016 at 4:24 AM, Jan de Mooij <jdemooij at mozilla.com> wrote:
> Is anyone using rr with VMWare Fusion 8+? The wiki  mentions Fusion 7
> should work, but with Fusion 8.1 I get very frequent replay divergences.
> For instance, I get a divergence when I replay just starting and
> immediately closing Firefox. I've set the
> monitor_control.disable_hvsim_clusters setting to true, as mentioned on the
> Some more data:
> * Guest is Ubuntu 15.10, 64-bit, kernel 4.2.0-30
> * Host is OS X 10.10, i7 4960HQ.
> * rr was the latest revision as of last week.
> * The tests pass, but sometimes I get a single failure - I'll look into
> that next.
> * The divergence is non-deterministic: sometimes I don't get it at all and
> it's not always at the same location.
> * See below for the failure message.
These really suck to debug unfortunately.
One question is: are the divergence failures in Firefox clustered in one
phase of startup or shutdown, or are they uniformly distributed?
Knowing more about the test failure could be useful.
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