stress test crash: Tuple::SetNull() from UnnestNode::Open()

(gdb) bt
#0  0x0000003fa8232625 in raise () from /lib64/libc.so.6
#1  0x0000003fa8233e05 in abort () from /lib64/libc.so.6
#2  0x00007f7f2b0edc55 in os::abort(bool) () from /opt/toolchain/sun-jdk-64bit-1.7.0.75/jre/lib/amd64/server/libjvm.so
#3  0x00007f7f2b26fcd7 in VMError::report_and_die() () from /opt/toolchain/sun-jdk-64bit-1.7.0.75/jre/lib/amd64/server/libjvm.so
#4  0x00007f7f2b0f2b6f in JVM_handle_linux_signal () from /opt/toolchain/sun-jdk-64bit-1.7.0.75/jre/lib/amd64/server/libjvm.so
#5  <signal handler called>
#6  0x0000000000c423d9 in SetNull (this=0x7f7c362e0380, state=0x156eff000) at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/be/src/runtime/tuple.h:124
#7  impala::UnnestNode::Open (this=0x7f7c362e0380, state=0x156eff000) at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/be/src/exec/unnest-node.cc:100
#8  0x0000000000c52e8f in impala::BlockingJoinNode::Open (this=0x7f6d2dbd0f80, state=0x156eff000) at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/be/src/exec/blocking-join-node.cc:209
#9  0x0000000000c121da in impala::NestedLoopJoinNode::Open (this=0x7f6d2dbd0f80, state=0x156eff000) at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/be/src/exec/nested-loop-join-node.cc:61
#10 0x0000000000c3addb in impala::SubplanNode::GetNext (this=0x7f7677b0adc0, state=0x156eff000, row_batch=0x7f76145da0a0, eos=0x7f6d2dbd0e61)
    at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/be/src/exec/subplan-node.cc:124
#11 0x0000000000c52f29 in impala::BlockingJoinNode::Open (this=0x7f6d2dbd0d00, state=0x156eff000) at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/be/src/exec/blocking-join-node.cc:220
#12 0x0000000000c121da in impala::NestedLoopJoinNode::Open (this=0x7f6d2dbd0d00, state=0x156eff000) at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/be/src/exec/nested-loop-join-node.cc:61
#13 0x0000000000c3addb in impala::SubplanNode::GetNext (this=0x7f7351b5b760, state=0x156eff000, row_batch=0x7f76145db840, eos=0x7f734f769361)
    at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/be/src/exec/subplan-node.cc:124
#14 0x0000000000c22ace in impala::PartitionedHashJoinNode::NextProbeRowBatch (this=0x7f734f769200, state=0x156eff000, out_batch=0x7f71fdf64360)
    at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/be/src/exec/partitioned-hash-join-node.cc:754
#15 0x0000000000c2a57d in impala::PartitionedHashJoinNode::GetNext (this=Unhandled dwarf expression opcode 0xf3
) at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/be/src/exec/partitioned-hash-join-node.cc:981
#16 0x0000000000c22ace in impala::PartitionedHashJoinNode::NextProbeRowBatch (this=0x7f78b6957b00, state=0x156eff000, out_batch=0x7f71fdf65d40)
    at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/be/src/exec/partitioned-hash-join-node.cc:754
#17 0x0000000000c2a57d in impala::PartitionedHashJoinNode::GetNext (this=Unhandled dwarf expression opcode 0xf3
) at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/be/src/exec/partitioned-hash-join-node.cc:981
#18 0x0000000000c22ace in impala::PartitionedHashJoinNode::NextProbeRowBatch (this=0x16815e880, state=0x156eff000, out_batch=0x7f71331f8760)
    at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/be/src/exec/partitioned-hash-join-node.cc:754
#19 0x0000000000c2a57d in impala::PartitionedHashJoinNode::GetNext (this=Unhandled dwarf expression opcode 0xf3
) at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/be/src/exec/partitioned-hash-join-node.cc:981
#20 0x0000000000c162ee in impala::PartitionedAggregationNode::GetRowsStreaming (this=Unhandled dwarf expression opcode 0xf3
) at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/be/src/exec/partitioned-aggregation-node.cc:483
#21 0x0000000000c1b801 in impala::PartitionedAggregationNode::GetNext (this=0x7f7c01478000, state=0x156eff000, row_batch=0x7f7a52862120, eos=0x7f7a34057099)
    at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/be/src/exec/partitioned-aggregation-node.cc:385
#22 0x0000000000d309cb in impala::PlanFragmentExecutor::GetNextInternal (this=0x7f7a34056f70, batch=0x7f73be176040) at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/be/src/runtime/plan-fragment-executor.cc:492
#23 0x0000000000d30f5f in impala::PlanFragmentExecutor::OpenInternal (this=0x7f7a34056f70) at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/be/src/runtime/plan-fragment-executor.cc:365
#24 0x0000000000d3175b in impala::PlanFragmentExecutor::Open (this=0x7f7a34056f70) at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/be/src/runtime/plan-fragment-executor.cc:328
#25 0x0000000000ad7608 in impala::FragmentMgr::FragmentExecState::Exec (this=0x7f7a34056d00) at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/be/src/service/fragment-exec-state.cc:54
#26 0x0000000000acefca in impala::FragmentMgr::FragmentThread (this=0xdb0fc80, fragment_instance_id=Unhandled dwarf expression opcode 0xf3
) at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/be/src/service/fragment-mgr.cc:86
#27 0x0000000000ad02da in operator() (function_obj_ptr=Unhandled dwarf expression opcode 0xf3
) at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/toolchain/boost-1.57.0/include/boost/bind/mem_fn_template.hpp:165
#28 operator()<boost::_mfi::mf1<void, impala::FragmentMgr, impala::TUniqueId>, boost::_bi::list0> (function_obj_ptr=Unhandled dwarf expression opcode 0xf3
)   
    at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/toolchain/boost-1.57.0/include/boost/bind/bind.hpp:313
#29 operator() (function_obj_ptr=Unhandled dwarf expression opcode 0xf3
) at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/toolchain/boost-1.57.0/include/boost/bind/bind_template.hpp:20
#30 boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void, boost::_mfi::mf1<void, impala::FragmentMgr, impala::TUniqueId>, boost::_bi::list2<boost::_bi::value<impala::FragmentMgr*>, boost::_bi::value<impala::TUniqueId> > >, void>::invoke (function_obj_ptr=Unhandled dwarf expression opcode 0xf3
) at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/toolchain/boost-1.57.0/include/boost/function/function_template.hpp:153
#31 0x0000000000b71dd7 in operator() (name=Unhandled dwarf expression opcode 0xf3
) at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/toolchain/boost-1.57.0/include/boost/function/function_template.hpp:767
#32 impala::Thread::SuperviseThread (name=Unhandled dwarf expression opcode 0xf3
) at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/be/src/util/thread.cc:316
#33 0x0000000000b72714 in operator()<void (*)(const std::basic_string<char>&, const std::basic_string<char>&, boost::function<void()>, impala::Promise<long int>*), boost::_bi::list0> (this=0x188d3cc00)
    at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/toolchain/boost-1.57.0/include/boost/bind/bind.hpp:457
#34 operator() (this=0x188d3cc00) at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/toolchain/boost-1.57.0/include/boost/bind/bind_template.hpp:20
#35 boost::detail::thread_data<boost::_bi::bind_t<void, void (*)(const std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, const std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, boost::function<void()>, impala::Promise<long int>*), boost::_bi::list4<boost::_bi::value<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, boost::_bi::value<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, boost::_bi::value<boost::function<void()> >, boost::_bi::value<impala::Promise<long int>*> > > >::run(void) (this=0x188d3cc00)
    at /usr/src/debug/impala-2.6.0-cdh5.8.0-SNAPSHOT/toolchain/boost-1.57.0/include/boost/thread/detail/thread.hpp:116
#36 0x0000000000dc02da in thread_proxy ()
#37 0x0000003fa86079d1 in start_thread () from /lib64/libpthread.so.0
#38 0x0000003fa82e88fd in clone () from /lib64/libc.so.6
(gdb)