Major - P3 I don't have a good reproducer. It happened while running a failing jstest in a loop.
Stacktrace:
m30999| 2015-04-27T18:02:26.454-0400 D NETWORK [Balancer] Socket recv() conn closed? 127.0.1.1:29000 m30999| 2015-04-27T18:02:26.454-0400 D NETWORK [Balancer] SocketException: remote: 127.0.1.1:29000 error: 9001 socket exception [CLOSED] server [127.0.1.1:29000] m30999| 2015-04-27T18:02:26.454-0400 I NETWORK [Balancer] DBClientCursor::init call() failed m30999| mongos: src/third_party/boost-1.56.0/boost/smart_ptr/scoped_ptr.hpp:99: T* boost::scoped_ptr<T>::operator->() const [with T = mongo::DBClientCursor]: Assertion `px != 0' failed. m30999| 2015-04-27T18:02:26.462-0400 F - [Balancer] Got signal: 6 (Aborted). m30999| m30999| 0x107b74c 0x107aa0f 0x107ae33 0x7ffbf1c35d40 0x7ffbf1c35cc9 0x7ffbf1c390d8 0x7ffbf1c2eb86 0x7ffbf1c2ec32 0xbfc923 0xed67ab 0xf2864c 0xf27d99 0xeb4ea6 0x100971d 0x100cfb3 0x100cf1c 0x100ce98 0x100ce6e \ 0x10ba1d5 0x7ffbf1fcc182 0x7ffbf1cf947d m30999| ----- BEGIN BACKTRACE ----- m30999| mongos(mongo::printStackTrace(std::ostream&) 0x27) [0x107b74c] m30999| mongos( 0xC7AA0F) [0x107aa0f] m30999| mongos( 0xC7AE33) [0x107ae33] m30999| libc.so.6( 0x36D40) [0x7ffbf1c35d40] m30999| libc.so.6(gsignal 0x39) [0x7ffbf1c35cc9] m30999| libc.so.6(abort 0x148) [0x7ffbf1c390d8] m30999| libc.so.6( 0x2FB86) [0x7ffbf1c2eb86] m30999| libc.so.6( 0x2FC32) [0x7ffbf1c2ec32] m30999| mongos(boost::scoped_ptr<mongo::DBClientCursor>::operator->() const 0x37) [0xbfc923] m30999| mongos(mongo::CatalogManagerLegacy::getAllShards(std::vector<mongo::ShardType, std::allocator<mongo::ShardType> >*) 0x345) [0xed67ab] m30999| mongos(mongo::StaticShardInfo::reload() 0x48) [0xf2864c] m30999| mongos(mongo::Shard::reloadShardInfo() 0x13) [0xf27d99] m30999| mongos(mongo::Shard::reloadShardInfo() 0x13) [0xf27d99] m30999| mongos(mongo::Balancer::run() 0x1F8) [0xeb4ea6] m30999| mongos(mongo::BackgroundJob::jobBody() 0x169) [0x100971d] m30999| mongos(void std::_Mem_fn<void (mongo::BackgroundJob::*)()>::operator()<, void>(mongo::BackgroundJob*) const 0x65) [0x100cfb3] m30999| mongos(void std::_Bind<std::_Mem_fn<void (mongo::BackgroundJob::*)()> (mongo::BackgroundJob*)>::__call<void, , 0ul>(std::tuple<>&&, std::_Index_tuple<0ul>) 0x48) [0x100cf1c] m30999| mongos(void std::_Bind<std::_Mem_fn<void (mongo::BackgroundJob::*)()> (mongo::BackgroundJob*)>::operator()<, void>() 0x28) [0x100ce98] m30999| mongos(boost::detail::thread_data<std::_Bind<std::_Mem_fn<void (mongo::BackgroundJob::*)()> (mongo::BackgroundJob*)> >::run() 0x1E) [0x100ce6e] m30999| mongos( 0xCBA1D5) [0x10ba1d5] m30999| libpthread.so.0( 0x8182) [0x7ffbf1fcc182] m30999| libc.so.6(clone 0x6D) [0x7ffbf1cf947d]