In-memory deadlock getting size

 [2016/05/03 05:09:36.835] #2  0x00000030d56094a7 in pthread_mutex_lock () from /lib64/libpthread.so.0

 [2016/05/03 05:09:36.835] #3  0x0000000001e5c4ee in __im_fs_size ()

 [2016/05/03 05:09:36.835] #4  0x0000000001e89968 in __wt_curstat_table_init ()

 [2016/05/03 05:09:36.835] #5  0x0000000001e32d01 in __wt_curstat_init ()

 [2016/05/03 05:09:36.835] #6  0x0000000001e33a9d in __wt_curstat_open ()

 [2016/05/03 05:09:36.835] #7  0x0000000001e8e6f5 in __session_open_cursor_int ()

 [2016/05/03 05:09:36.835] #8  0x0000000001e8ecc8 in __session_open_cursor ()

 [2016/05/03 05:09:36.836] #9  0x0000000001390f37 in mongo::WiredTigerUtil::getStatisticsValue(__wt_session*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int) ()

 [2016/05/03 05:09:36.836] #10 0x0000000001391c68 in mongo::WiredTigerUtil::getIdentSize(__wt_session*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) ()

 [2016/05/03 05:09:36.836] #11 0x000000000136e1a4 in mongo::WiredTigerKVEngine::getIdentSize(mongo::OperationContext*, mongo::StringData) ()

 [2016/05/03 05:09:36.836] #12 0x00000000012ab133 in mongo::KVDatabaseCatalogEntry::sizeOnDisk(mongo::OperationContext*) const ()