Looks like it was the V8_COMPRESS_POINTERS define. I didn't use 
V8_31BIT_SMIS_ON_64BIT_ARCH however, could you elaborate more on what that 
define does? 

On Tuesday, 25 February 2020 17:12:05 UTC-5, Ben Noordhuis wrote:
>
> On Mon, Feb 24, 2020 at 7:35 PM Joel Scarfone <joelrs...@gmail.com 
> <javascript:>> wrote: 
> > 
> > V8 Version: 8.0.426.23 
> > 
> > Hi all! When updating V8 I found a segmentation fault in tests. I 
> managed to reproduce it with the following code (initialization code 
> stripped, can provide full example upon request): 
> > 
> >  Local<String> str = String::NewFromUtf8(isolate, "Hello", 
> v8::NewStringType::kNormal) 
> >         .ToLocalChecked(); Local<Value> val = Local<Value>::Cast(str); 
> Persistent<Value> persistentVal(isolate, val); 
> persistentVal.Get(isolate)->IsString(); // seg fault 
> > 
> > 
> > This worked on previous version. Is this now invalid? 
>
> Can you verify that V8 and your code are compiled using the same 
> compiler flags? More specifically: defines? 
>
> A number of people have reported crashes after recent upgrades that 
> could be traced back to V8 turning on pointer compression but the 
> downstream projects missing the requisite V8_COMPRESS_POINTERS and 
> V8_31BIT_SMIS_ON_64BIT_ARCH defines. 
>

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