I don't have a great answer, but 

> ==16592== Conditional jump or move depends on uninitialised value(s)

usually means it's seeing the value as being a valrind-specific magic 
number that shouldn't exist in normal circumstances like 0xbebebebebebebebe 
as far as I remember.

This would make it likely that it's not a false positive.

Have you run valgrind with –track-origins=yes ?

--Zac

On Sunday, September 3, 2017 at 7:01:36 AM UTC-7, Bogdan Padalko wrote:
>
> Under certain circumstances when when I suppressed reports listed in a 
> previous mail, I'm getting output similar to one in 
> https://bugs.chromium.org/p/v8/issues/detail?id=6566, so I guess the 
> overall issue is that how valgrind traits optimized v8 code (I'm using 
> release build).
>
> Can someone validate my assumptions, please? While it looks like I get it, 
> v8 internals is a tough piece of cake.
>
> For now I will suppress all reports which relates to v8 internals.
>
> Regards,
> Bogdan
>

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