std::exception::what(): boost::lock_error
Actual exception type: boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::lock_error> >

mongod(mongo::printStackTrace(std::ostream&) 0x27) [/home/ubuntu/mongo/src/mongo/util/stacktrace_posix.cpp:104]
mongod( 0x151A087) [/home/ubuntu/mongo/src/mongo/util/signal_handlers_synchronous.cpp:180]
libstdc.so.6( 0x5E836) [0x7ffff750a836]
libstdc.so.6( 0x5D8F9) [0x7ffff75098f9]
libstdc.so.6(__gxx_personality_v0 0x52A) [0x7ffff750a4aa]
libgcc_s.so.1( 0xFFF3) [0x7ffff6f9fff3]
libgcc_s.so.1(_Unwind_Resume 0x57) [0x7ffff6fa0517]
mongod(mongo::CachedPlanStage::updateCache() 0x372) [/home/ubuntu/mongo/src/mongo/db/exec/cached_plan.cpp:198]
mongod(mongo::CachedPlanStage::~CachedPlanStage() 0x39) [/home/ubuntu/mongo/src/mongo/db/exec/cached_plan.cpp:67]
mongod(mongo::CachedPlanStage::~CachedPlanStage() 0x18) [/home/ubuntu/mongo/src/mongo/db/exec/cached_plan.cpp:73]
mongod(void boost::checked_delete<mongo::PlanStage>(mongo::PlanStage*) 0x2A) [/home/ubuntu/mongo/src/third_party/boost/boost/checked_delete.hpp:40]
mongod(boost::scoped_ptr<mongo::PlanStage>::~scoped_ptr() 0x1B) [/home/ubuntu/mongo/src/third_party/boost/boost/smart_ptr/scoped_ptr.hpp:81]
mongod(mongo::CountStage::~CountStage() 0x50) [/home/ubuntu/mongo/src/mongo/db/exec/count.cpp:58]
mongod(mongo::CountStage::~CountStage() 0x18) [/home/ubuntu/mongo/src/mongo/db/exec/count.cpp:58]
mongod(void boost::checked_delete<mongo::PlanStage>(mongo::PlanStage*) 0x2A) [/home/ubuntu/mongo/src/third_party/boost/boost/checked_delete.hpp:40]
mongod(boost::scoped_ptr<mongo::PlanStage>::~scoped_ptr() 0x1B) [/home/ubuntu/mongo/src/third_party/boost/boost/smart_ptr/scoped_ptr.hpp:81]
mongod(mongo::PlanExecutor::~PlanExecutor() 0x4C) [/home/ubuntu/mongo/src/mongo/db/query/plan_executor.cpp:197]
mongod(void boost::checked_delete<mongo::PlanExecutor>(mongo::PlanExecutor*) 0x1E) [/home/ubuntu/mongo/src/third_party/boost/boost/checked_delete.hpp:39 (discriminator 1)]
mongod(boost::scoped_ptr<mongo::PlanExecutor>::~scoped_ptr() 0x1B) [/home/ubuntu/mongo/src/third_party/boost/boost/smart_ptr/scoped_ptr.hpp:81]
mongod(mongo::CmdCount::run(mongo::OperationContext*, std::string const&, mongo::BSONObj&, int, std::string&, mongo::BSONObjBuilder&, bool) 0x368) [/home/ubuntu/mongo/src/mongo/db/commands/count.cpp:137]
mongod(mongo::_execCommand(mongo::OperationContext*, mongo::Command*, std::string const&, mongo::BSONObj&, int, std::string&, mongo::BSONObjBuilder&, bool) 0x96) [/home/ubuntu/mongo/src/mongo/db/dbcommands.cpp:1273]
mongod(mongo::Command::execCommand(mongo::OperationContext*, mongo::Command*, int, char const*, mongo::BSONObj&, mongo::BSONObjBuilder&, bool) 0xB9E) [/home/ubuntu/mongo/src/mongo/db/dbcommands.cpp:1489]
mongod(mongo::_runCommands(mongo::OperationContext*, char const*, mongo::BSONObj&, mongo::_BufBuilder<mongo::TrivialAllocator>&, mongo::BSONObjBuilder&, bool, int) 0x491) [/home/ubuntu/mongo/src/mongo/db/dbcommands.cpp:1561]
mongod( 0x1135D2A) [/home/ubuntu/mongo/src/mongo/db/query/find.cpp:137]
mongod(mongo::runQuery(mongo::OperationContext*, mongo::Message&, mongo::QueryMessage&, mongo::NamespaceString const&, mongo::CurOp&, mongo::Message&, bool) 0x372) [0x1537d52]
mongod( 0x103DEFA) [/home/ubuntu/mongo/src/mongo/db/instance.cpp:220 (discriminator 1)]
mongod(mongo::assembleResponse(mongo::OperationContext*, mongo::Message&, mongo::DbResponse&, mongo::HostAndPort const&, bool) 0x4F9) [/home/ubuntu/mongo/src/mongo/db/instance.cpp:403]
mongod(mongo::MyMessageHandler::process(mongo::Message&, mongo::AbstractMessagingPort*, mongo::LastError*) 0xF6) [/home/ubuntu/mongo/src/mongo/db/db.cpp:206 (discriminator 1)]
mongod(mongo::PortMessageServer::handleIncomingMsg(void*) 0x40D) [/home/ubuntu/mongo/src/mongo/util/net/message_server_port.cpp:231]
libpthread.so.0( 0x8182) [0x7ffff7bc4182]
libc.so.6(clone 0x6D) [0x7ffff6cc500d]