我在Mac High Sierra v10.13.4上使用Xcode 9.4。我已将FireStore集成到我的应用程序中，并且启用了“未定义的行为清除程序”。
当我执行以下命令时
- (void)updateData:(NSDictionary<id, id> *)fields
completion:(nullable void (^)(NSError *_Nullable error))completion
我在控制台中收到此错误
/Users/<folderName>/Pods/FirebaseFirestore/Firestore/core/src/firebase/firestore/util/ordered_code.cc:172:21: runtime error: load of misaligned address 0x000106af8a41 for type 'const uint32_t' (aka 'const unsigned int'), which requires 4 byte alignment
0x000106af8a41: note: pointer points here
69 6e 67 00 76 65 72 73 69 6f 6e 00 54 40 22 4e 53 4e 75 6d 62 65 72 22 2c 52 2c 56 5f 76 65 72
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /Users/<folderName>/Pods/FirebaseFirestore/Firestore/core/src/firebase/firestore/util/ordered_code.cc:172:21 in
/Users/<folderName>/Pods/FirebaseFirestore/Firestore/core/src/firebase/firestore/util/ordered_code.cc:102:3: runtime error: load of misaligned address 0x000106af8a41 for type 'const uint32_t' (aka 'const unsigned int'), which requires 4 byte alignment
0x000106af8a41: note: pointer points here
69 6e 67 00 76 65 72 73 69 6f 6e 00 54 40 22 4e 53 4e 75 6d 62 65 72 22 2c 52 2c 56 5f 76 65 72
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /Users/<folderName>/Pods/FirebaseFirestore/Firestore/core/src/firebase/firestore/util/ordered_code.cc:102:3 in
这很容易复制
当我在Xcode中同时启用“线程清理程序”和“未定义行为”时，我会在控制台中看到此消息。
================== WARNING: ThreadSanitizer: data race (pid=59902)
Read of size 8 at 0x7b4c00051750 by thread T10:
#0 leveldb::port::AtomicPointer::Acquire_Load() const atomic_pointer.h:135 (leveldb:x86_64+0x73d55)
#1 leveldb::(anonymous namespace)::Limiter::GetAllowed() const env_posix.cc:80 (leveldb:x86_64+0x15ccd6)
#2 leveldb::(anonymous namespace)::Limiter::Acquire() env_posix.cc:55 (leveldb:x86_64+0x15c768)
#3 leveldb::(anonymous namespace)::PosixEnv::NewRandomAccessFile(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, leveldb::RandomAccessFile**) env_posix.cc:354 (leveldb:x86_64+0x1461d6)
#4 leveldb::TableCache::FindTable(unsigned long long, unsigned long long, leveldb::Cache::Handle**) table_cache.cc:56 (leveldb:x86_64+0x228a50)
#5 leveldb::TableCache::Get(leveldb::ReadOptions const&, unsigned long long, unsigned long long, leveldb::Slice const&, void*, void (*)(void*, leveldb::Slice const&, leveldb::Slice const&)) table_cache.cc:112 (leveldb:x86_64+0x229cf9)
#6 leveldb::Version::Get(leveldb::ReadOptions const&, leveldb::LookupKey const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*, leveldb::Version::GetStats*) version_set.cc:408 (leveldb:x86_64+0x27fbd6)
#7 leveldb::DBImpl::Get(leveldb::ReadOptions const&, leveldb::Slice const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*) db_impl.cc:1141 (leveldb:x86_64+0x8f922)
#8 firebase::firestore::local::LevelDbTransaction::Get(absl::string_view const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*) <null>:5344896 (SampleApp:x86_64+0x10109be79)
#9 +[FSTLevelDBMigrations schemaVersionWithTransaction:] <null>:5344896 (SampleApp:x86_64+0x100cedd6a)
#10 +[FSTLevelDBMigrations runMigrationsWithTransaction:] <null>:5344896 (SampleApp:x86_64+0x100cedf3e)
#11 -[FSTLevelDB start:] <null>:5344896 (SampleApp:x86_64+0x100cbbf1e)
#12 -[FSTFirestoreClient initializeWithUser:usePersistence:] <null>:5344896 (SampleApp:x86_64+0x100c5f2d3)
#13 __111-[FSTFirestoreClient initWithDatabaseInfo:usePersistence:credentialsProvider:userExecutor:workerDispatchQueue:]_block_invoke <null>:5344896 (SampleApp:x86_64+0x100c5c87a)
#14 -[FSTDispatchQueue dispatchAsync:]::$_1::operator()() const <null>:5344896 (SampleApp:x86_64+0x100bf6a7b)
#15 void std::__1::__invoke_void_return_wrapper<void>::__call<-[FSTDispatchQueue dispatchAsync:]::$_1&>(-[FSTDispatchQueue dispatchAsync:]::$_1&&&) <null>:5344896 (SampleApp:x86_64+0x100bf69cc)
#16 std::__1::__function::__func<-[FSTDispatchQueue dispatchAsync:]::$_1, std::__1::allocator<-[FSTDispatchQueue dispatchAsync:]::$_1>, void ()>::operator()() <null>:5344896 (SampleApp:x86_64+0x100bf5e6e)
#17 std::__1::function<void ()>::operator()() const <null>:5344896 (SampleApp:x86_64+0x100be643b)
#18 firebase::firestore::util::AsyncQueue::ExecuteBlocking(std::__1::function<void ()> const&) <null>:5344896 (SampleApp:x86_64+0x100a67d40)
#19 firebase::firestore::util::AsyncQueue::Wrap(std::__1::function<void ()> const&)::$_0::operator()() const <null>:5344896 (SampleApp:x86_64+0x100a774ac)
#20 void std::__1::__invoke_void_return_wrapper<void>::__call<firebase::firestore::util::AsyncQueue::Wrap(std::__1::function<void ()> const&)::$_0&>(firebase::firestore::util::AsyncQueue::Wrap(std::__1::function<void ()> const&)::$_0&&&) <null>:5344896 (SampleApp:x86_64+0x100a773cc)
#21 std::__1::__function::__func<firebase::firestore::util::AsyncQueue::Wrap(std::__1::function<void ()> const&)::$_0, std::__1::allocator<firebase::firestore::util::AsyncQueue::Wrap(std::__1::function<void ()> const&)::$_0>, void ()>::operator()() <null>:5344896 (SampleApp:x86_64+0x100a7662e)
#22 std::__1::function<void ()>::operator()() const <null>:5344896 (SampleApp:x86_64+0x100be643b)
#23 firebase::firestore::util::internal::DispatchAsync(NSObject<OS_dispatch_queue>*, std::__1::function<void ()>&&)::$_0::operator()(void*) const <null>:5344896 (SampleApp:x86_64+0x100ac1d99)
#24 firebase::firestore::util::internal::DispatchAsync(NSObject<OS_dispatch_queue>*, std::__1::function<void ()>&&)::$_0::__invoke(void*) <null>:5344896 (SampleApp:x86_64+0x100ac1cf8)
#25 __tsan::dispatch_callback_wrap(void*) <null>:5344896 (libclang_rt.tsan_iossim_dynamic.dylib:x86_64+0x62401)
#26 _dispatch_client_callout <null>:5344896 (libdispatch.dylib:x86_64+0x37eb)
Previous write of size 8 at 0x7b4c00051750 by thread T20 (mutexes: write M1134761197468718864):
#0 leveldb::port::AtomicPointer::Release_Store(void*) atomic_pointer.h:141 (leveldb:x86_64+0x57b76)
#1 leveldb::(anonymous namespace)::Limiter::SetAllowed(long) env_posix.cc:85 (leveldb:x86_64+0x158646)
#2 leveldb::(anonymous namespace)::Limiter::Acquire() env_posix.cc:63 (leveldb:x86_64+0x15c82e)
#3 leveldb::(anonymous namespace)::PosixEnv::NewRandomAccessFile(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, leveldb::RandomAccessFile**) env_posix.cc:354 (leveldb:x86_64+0x1461d6)
#4 leveldb::TableCache::FindTable(unsigned long long, unsigned long long, leveldb::Cache::Handle**) table_cache.cc:56 (leveldb:x86_64+0x228a50)
#5 leveldb::TableCache::NewIterator(leveldb::ReadOptions const&, unsigned long long, unsigned long long, leveldb::Table**) table_cache.cc:91 (leveldb:x86_64+0x229712)
#6 leveldb::VersionSet::MakeInputIterator(leveldb::Compaction*) version_set.cc:1274 (leveldb:x86_64+0x2b6b61)
#7 leveldb::DBImpl::DoCompactionWork(leveldb::DBImpl::CompactionState*) db_impl.cc:909 (leveldb:x86_64+0x7ffeb)
#8 leveldb::DBImpl::BackgroundCompaction() db_impl.cc:737 (leveldb:x86_64+0x7c79f)
#9 leveldb::DBImpl::BackgroundCall() db_impl.cc:675 (leveldb:x86_64+0x77f0a)
#10 leveldb::DBImpl::BGWork(void*) db_impl.cc:664 (leveldb:x86_64+0x77cf5)
#11 leveldb::(anonymous namespace)::PosixEnv::BGThread() env_posix.cc:648 (leveldb:x86_64+0x18885b)
#12 leveldb::(anonymous namespace)::PosixEnv::BGThreadWrapper(void*) env_posix.cc:555 (leveldb:x86_64+0x186995)
Location is heap block of size 416 at 0x7b4c00051600 allocated by thread T10:
#0 operator new(unsigned long) <null>:5344912 (libclang_rt.tsan_iossim_dynamic.dylib:x86_64+0x67bd3)
#1 leveldb::InitDefaultEnv() env_posix.cc:678 (leveldb:x86_64+0x142aac)
#2 pthread_once <null>:5344912 (libclang_rt.tsan_iossim_dynamic.dylib:x86_64+0x28236)
#3 leveldb::Env::Default() env_posix.cc:691 (leveldb:x86_64+0x142a43)
#4 leveldb::Options::Options() options.cc:17 (leveldb:x86_64+0x1ea333)
#5 leveldb::Options::Options() options.cc:27 (leveldb:x86_64+0x1ea5a9)
#6 -[FSTLevelDB createDBWithDirectory:error:] <null>:5344912 (SampleApp:x86_64+0x100cbcb5d)
#7 -[FSTLevelDB start:] <null>:5344912 (SampleApp:x86_64+0x100cbb45d)
#8 -[FSTFirestoreClient initializeWithUser:usePersistence:] <null>:5344912 (SampleApp:x86_64+0x100c5f2d3)
#9 __111-[FSTFirestoreClient initWithDatabaseInfo:usePersistence:credentialsProvider:userExecutor:workerDispatchQueue:]_block_invoke <null>:5344912 (SampleApp:x86_64+0x100c5c87a)
#10 -[FSTDispatchQueue dispatchAsync:]::$_1::operator()() const <null>:5344912 (SampleApp:x86_64+0x100bf6a7b)
#11 void std::__1::__invoke_void_return_wrapper<void>::__call<-[FSTDispatchQueue dispatchAsync:]::$_1&>(-[FSTDispatchQueue dispatchAsync:]::$_1&&&) <null>:5344912 (SampleApp:x86_64+0x100bf69cc)
#12 std::__1::__function::__func<-[FSTDispatchQueue dispatchAsync:]::$_1, std::__1::allocator<-[FSTDispatchQueue dispatchAsync:]::$_1>, void ()>::operator()() <null>:5344912 (SampleApp:x86_64+0x100bf5e6e)
#13 std::__1::function<void ()>::operator()() const <null>:5344912 (SampleApp:x86_64+0x100be643b)
#14 firebase::firestore::util::AsyncQueue::ExecuteBlocking(std::__1::function<void ()> const&) <null>:5344912 (SampleApp:x86_64+0x100a67d40)
#15 firebase::firestore::util::AsyncQueue::Wrap(std::__1::function<void ()> const&)::$_0::operator()() const <null>:5344912 (SampleApp:x86_64+0x100a774ac)
#16 void std::__1::__invoke_void_return_wrapper<void>::__call<firebase::firestore::util::AsyncQueue::Wrap(std::__1::function<void ()> const&)::$_0&>(firebase::firestore::util::AsyncQueue::Wrap(std::__1::function<void ()> const&)::$_0&&&) <null>:5344912 (SampleApp:x86_64+0x100a773cc)
#17 std::__1::__function::__func<firebase::firestore::util::AsyncQueue::Wrap(std::__1::function<void ()> const&)::$_0, std::__1::allocator<firebase::firestore::util::AsyncQueue::Wrap(std::__1::function<void ()> const&)::$_0>, void ()>::operator()() <null>:5344912 (SampleApp:x86_64+0x100a7662e)
#18 std::__1::function<void ()>::operator()() const <null>:5344912 (SampleApp:x86_64+0x100be643b)
#19 firebase::firestore::util::internal::DispatchAsync(NSObject<OS_dispatch_queue>*, std::__1::function<void ()>&&)::$_0::operator()(void*) const <null>:5344912 (SampleApp:x86_64+0x100ac1d99)
#20 firebase::firestore::util::internal::DispatchAsync(NSObject<OS_dispatch_queue>*, std::__1::function<void ()>&&)::$_0::__invoke(void*) <null>:5344912 (SampleApp:x86_64+0x100ac1cf8)
#21 __tsan::dispatch_callback_wrap(void*) <null>:5344912 (libclang_rt.tsan_iossim_dynamic.dylib:x86_64+0x62401)
#22 _dispatch_client_callout <null>:5344912 (libdispatch.dylib:x86_64+0x37eb)
Mutex M1134761197468718864 is already destroyed.
Thread T10 (tid=26697881, running) is a GCD worker thread
Thread T20 (tid=26701255, running) created by thread T10 at:
#0 pthread_create <null>:5344976 (libclang_rt.tsan_iossim_dynamic.dylib:x86_64+0x2678d)
#1 leveldb::(anonymous namespace)::PosixEnv::Schedule(void (*)(void*), void*) env_posix.cc:618 (leveldb:x86_64+0x153ef7)
#2 leveldb::DBImpl::MaybeScheduleCompaction() db_impl.cc:659 (leveldb:x86_64+0x779e9)
#3 leveldb::DB::Open(leveldb::Options const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, leveldb::DB**) db_impl.cc:1522 (leveldb:x86_64+0x9fdeb)
#4 -[FSTLevelDB createDBWithDirectory:error:] <null>:5344976 (SampleApp:x86_64+0x100cbcfd3)
#5 -[FSTLevelDB start:] <null>:5344976 (SampleApp:x86_64+0x100cbb45d)
#6 -[FSTFirestoreClient initializeWithUser:usePersistence:] <null>:5344976 (SampleApp:x86_64+0x100c5f2d3)
#7 __111-[FSTFirestoreClient initWithDatabaseInfo:usePersistence:credentialsProvider:userExecutor:workerDispatchQueue:]_block_invoke <null>:5344976 (SampleApp:x86_64+0x100c5c87a)
#8 -[FSTDispatchQueue dispatchAsync:]::$_1::operator()() const <null>:5344976 (SampleApp:x86_64+0x100bf6a7b)
#9 void std::__1::__invoke_void_return_wrapper<void>::__call<-[FSTDispatchQueue dispatchAsync:]::$_1&>(-[FSTDispatchQueue dispatchAsync:]::$_1&&&) <null>:5344976 (SampleApp:x86_64+0x100bf69cc)
#10 std::__1::__function::__func<-[FSTDispatchQueue dispatchAsync:]::$_1, std::__1::allocator<-[FSTDispatchQueue dispatchAsync:]::$_1>, void ()>::operator()() <null>:5344976 (SampleApp:x86_64+0x100bf5e6e)
#11 std::__1::function<void ()>::operator()() const <null>:5344976 (SampleApp:x86_64+0x100be643b)
#12 firebase::firestore::util::AsyncQueue::ExecuteBlocking(std::__1::function<void ()> const&) <null>:5344976 (SampleApp:x86_64+0x100a67d40)
#13 firebase::firestore::util::AsyncQueue::Wrap(std::__1::function<void ()> const&)::$_0::operator()() const <null>:5344976 (SampleApp:x86_64+0x100a774ac)
#14 void std::__1::__invoke_void_return_wrapper<void>::__call<firebase::firestore::util::AsyncQueue::Wrap(std::__1::function<void ()> const&)::$_0&>(firebase::firestore::util::AsyncQueue::Wrap(std::__1::function<void ()> const&)::$_0&&&) <null>:5344976 (SampleApp:x86_64+0x100a773cc)
#15 std::__1::__function::__func<firebase::firestore::util::AsyncQueue::Wrap(std::__1::function<void ()> const&)::$_0, std::__1::allocator<firebase::firestore::util::AsyncQueue::Wrap(std::__1::function<void ()> const&)::$_0>, void ()>::operator()() <null>:5344976 (SampleApp:x86_64+0x100a7662e)
#16 std::__1::function<void ()>::operator()() const <null>:5344976 (SampleApp:x86_64+0x100be643b)
#17 firebase::firestore::util::internal::DispatchAsync(NSObject<OS_dispatch_queue>*, std::__1::function<void ()>&&)::$_0::operator()(void*) const <null>:5344976 (SampleApp:x86_64+0x100ac1d99)
#18 firebase::firestore::util::internal::DispatchAsync(NSObject<OS_dispatch_queue>*, std::__1::function<void ()>&&)::$_0::__invoke(void*) <null>:5344976 (SampleApp:x86_64+0x100ac1cf8)
#19 __tsan::dispatch_callback_wrap(void*) <null>:5344976 (libclang_rt.tsan_iossim_dynamic.dylib:x86_64+0x62401)
#20 _dispatch_client_callout <null>:5344976 (libdispatch.dylib:x86_64+0x37eb)
SUMMARY: ThreadSanitizer: data race atomic_pointer.h:135 in leveldb::port::AtomicPointer::Acquire_Load() const
==================