Re: weird assertion failure in js::NewContext (JS60)

On Wed, Mar 27, 2019 at 04:40:36PM -0500, Kent Williams wrote:
> This is an app that embeds JS60 SpiderMonkey (checked out from github and
> based on the the JS60 release tag)
> 
> The same code seems to work fine in a bunch of my own tests.  I passed it
> off to another programmer, and he somehow gets it to segfault.
> 
> My mystery is that the stuff he's doing follows EXACTLY the same path into
> the SpiderMonkey code as everything else I've done.
> 
> The crash comes on this line:
> 
>     MOZ_RELEASE_ASSERT(!TlsContext.get());
> 
> at the top of js::NewContext()
> 
> I don't know what TlsContext.get() is supposed to return, except in this
> case it's returning NULL/nullptr.

There's so little information here it's not going too be practical to guess.
Can you provide a stack trace?  Unless you can reproduce it yourself it's
going to be very difficult to work on.  The other programmer should try
doing a debug non-optimized build and running it in a debugger to try to
find the problem.  Because it's your embedding they may need to work with
you in case it's a bug in your code.

Good luck.


-- 
Paul Bone
http://paul.bone.id.au