crash in ReaderArena::tryGetSegment()

[Robert Ritz]

I'm using release 0.6.1 and seeing a crash due to calling pure virtual function ReaderArena::tryGetSegment().

Stack trace is:

 std::terminate() ()

 __cxa_pure_virtual ()

 capnp::_::ReaderArena::tryGetSegment(kj::Id<unsigned int, capnp::_::Segment>) ()

 capnp::Data::Reader capnp::_::PointerReader::getBlob<capnp::Data>(void const*, unsigned int) const ()

 capnp::_::PointerHelpers<capnp::Data, (capnp::Kind)1>::get (defaultBytes=0, defaultValue=0x0, reader=...)

 ...

Any idea if this is a known issue?  Or any other suggestion?

Thanks,

Rob

[Kenton Varda]

Hi Robert,

This almost certainly means that you're trying to use a Reader object after the containing MessageReader has been destroyed. Check where you're creating the MessageReader and make sure it stays alive until you're done using all the Reader objects that point into it.

-Kenton

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[Robert Ritz]

Thanks for the quick reply.  As you suspected, I was referencing a MessageReader object that was out of scope.

Thanks,
Rob