Native crash when running npm test with node 6

[Pchelolo]

That's weird, but I get a native crash simply by running npm test in the repository when using node.js 6.0.0. It's not completely clear where is it coming from, but here's a relevant part of the crash dump:

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_CRASH (SIGABRT)
Exception Codes:       0x0000000000000000, 0x0000000000000000

Application Specific Information:
abort() called
*** error for object 0x7f9602e014f0: pointer being freed was not allocated


Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libsystem_kernel.dylib          0x00007fff8f610f06 __pthread_kill + 10
1   libsystem_pthread.dylib         0x00007fff9cd414ec pthread_kill + 90
2   libsystem_c.dylib               0x00007fff9e9cb6e7 abort + 129
3   libsystem_malloc.dylib          0x00007fff8aef5041 free + 425
4   node-librdkafka.node            0x0000000109855578 RdKafka::ConfImpl::~ConfImpl() + 14 (rdkafkacpp_int.h:228)
5   node-librdkafka.node            0x0000000109849ffb NodeKafka::Connection::~Connection() + 67 (connection.cc:67)
6   node-librdkafka.node            0x000000010984fa36 NodeKafka::Producer::~Producer() + 14 (producer.cc:40)
7   node                            0x0000000107ddde43 v8::internal::GlobalHandles::DispatchPendingPhantomCallbacks(bool) + 163
8   node                            0x0000000107dde171 v8::internal::GlobalHandles::PostGarbageCollectionProcessing(v8::internal::GarbageCollector, v8::GCCallbackFlags) + 49
9   node                            0x0000000107deb35f v8::internal::Heap::PerformGarbageCollection(v8::internal::GarbageCollector, v8::GCCallbackFlags) + 1871
10  node                            0x0000000107dea79d v8::internal::Heap::CollectGarbage(v8::internal::GarbageCollector, char const*, char const*, v8::GCCallbackFlags) + 717
11  node                            0x0000000107dae6bb v8::internal::Factory::NewFillerObject(int, bool, v8::internal::AllocationSpace) + 107
12  node                            0x0000000107ff31bb v8::internal::Runtime_AllocateInTargetSpace(int, v8::internal::Object**, v8::internal::Isolate*) + 139

Seems like the 'RdKafka::Conf' object deletion crashes internally - perhaps some of the properties were garbage-collected by v8?

[Pchelolo]

Here's a minimalistic test case, run it with --expose_gc flag, with this test the version of node doesn't matter - it crashes anyway.

"use strict";
var Producer = require('bindings')('node-librdkafka').Producer;
new Producer({}, {});
global.gc();

[webmakersteve]

Fixed with PR #11