% UBSAN_OPTIONS=print_stacktrace=1 build/ninjaASAN/mongo/bson/bson_obj_test                                                                         
src/mongo/base/data_view.h:46:23: runtime error: addition of unsigned offset to 0x55eb06831084 overflowed to 0x55eb06831080                                                                                       
    #0 0x55eb05d1e642 in mongo::ConstDataView::view(unsigned long) const /home/sajack/mongo/src/mongo/base/data_view.h:46:23                                                                                      
    #1 0x55eb0642de6a in mongo::ConstDataView const& mongo::ConstDataView::read<mongo::ReverseLittleEndian<unsigned int> >(mongo::ReverseLittleEndian<unsigned int>*, unsigned long) const /home/sajack/mongo/src/mongo/base/data_view.h:51:33
    #2 0x55eb0642daf8 in mongo::ReverseLittleEndian<unsigned int> mongo::ConstDataView::read<mongo::ReverseLittleEndian<unsigned int> >(unsigned long) const /home/sajack/mongo/src/mongo/base/data_view.h:60:9   
    #3 0x55eb0642c646 in getblock(unsigned int const*, int) /home/sajack/mongo/src/third_party/murmurhash3/MurmurHash3.cpp:67:10                                                                                  
    #4 0x55eb0642c646 in MurmurHash3_x86_32(void const*, int, unsigned int, void*) /home/sajack/mongo/src/third_party/murmurhash3/MurmurHash3.cpp:123                                                             
    #5 0x55eb061e7275 in mongo::StringMapTraits::hash(mongo::StringData) /home/sajack/mongo/src/mongo/util/string_map.h:43:9                                                                                      
    #6 0x55eb061e612c in mongo::StringMapTraits::HashedKey::HashedKey(mongo::StringData) /home/sajack/mongo/src/mongo/util/string_map.h:61:68                                                                     
    #7 0x55eb061e3f5c in mongo::UnorderedFastKeyTable<mongo::StringData, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, mongo::BSONType, mongo::StringMapTraits>::UnorderedFastKeyTable(std::initializer_list<std::pair<mongo::StringData, mongo::BSONType> >) /home/sajack/mongo/src/mongo/util/unordered_fast_key_table_internal.h:101:20                                                        
    #8 0x55eb05b5c8d9 in __cxx_global_var_init.26 /home/sajack/mongo/src/mongo/bson/bsontypes.cpp:96:43
    #9 0x55eb05b5cae8 in _GLOBAL__sub_I_bsontypes.cpp /home/sajack/mongo/src/mongo/bson/bsontypes.cpp
    #10 0x55eb0663074c in __libc_csu_init (/home/sajack/mongo/build/ninjaASAN/mongo/bson/bson_obj_test+0x134b74c)                                                                                                 
    #11 0x7f8d1cd0f1ad in __libc_start_main (/usr/lib/libc.so.6+0x241ad)
    #12 0x55eb05b6258d in _start (/home/sajack/mongo/build/ninjaASAN/mongo/bson/bson_obj_test+0x87d58d)

SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior src/mongo/base/data_view.h:46:23 in
% clang --version                                                                                                                                   
clang version 6.0.1 (tags/RELEASE_601/final)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin