firebase / firebase/firebase-ios-sdk

Firestore Crash (assertion) if connection is interrupted in between transaction retries at specific point

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#10,719 13 comments 0 reactions 1 assignee Claimed by @MarkDuckworth View on GitHub
api: firestore needs-attention
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Description

### Description

We have been observing this issue in production and it appears similar issues have been reported by others and I have a theory of how to try to reproduce it via unit tests.

```

Fatal Exception: NSInternalInconsistencyException
0 CoreFoundation 0xa248 __exceptionPreprocess
1 libobjc.A.dylib 0x17a68 objc_exception_throw
2 Foundation 0x546958 -[NSMutableDictionary(NSMutableDictionary) initWithContentsOfFile:]
3 Runner 0xb17c0 firebase::firestore::util::ObjcThrowHandler(firebase::firestore::util::ExceptionType, char const*, char const*, int, std::__1::basic_string, std::__1::allocator > const&)
4 Runner 0xb126c firebase::firestore::util::Throw(firebase::firestore::util::ExceptionType, char const*, char const*, int, std::__1::basic_string, std::__1::allocator > const&)
5 Runner 0x109c88 firebase::firestore::util::internal::FailAssertion(char const*, char const*, int, std::__1::basic_string, std::__1::allocator > const&, char const*)
6 Runner 0x109d18 firebase::firestore::util::internal::FailAssertion(char const*, char const*, int, std::__1::basic_string, std::__1::allocator > const&, char const*)
7 Runner 0x1b43a8 firebase::firestore::core::Transaction::EnsureCommitNotCalled()
8 Runner 0x1b4000 firebase::firestore::core::Transaction::Lookup(std::__1::vector > const&, std::__1::function > > const&)>&&)
9 Runner 0xf4934 -[FIRTransaction getDocument:completion:]
10 Runner 0xf4b10 -[FIRTransaction getDocument:error:]
11 Runner 0x1fa648 __66-[FLTFirebaseFirestorePlugin transactionGet:withMethodCallResult:]_block_invoke + 368 (FLTFirebaseFirestorePlugin.m:368)
12 libdispatch.dylib 0x24b4 _dispatch_call_block_and_release
13 libdispatch.dylib 0x3fdc _dispatch_client_callout
14 libdispatch.dylib 0x70c8 _dispatch_queue_override_invoke
15 libdispatch.dylib 0x15a6c _dispatch_root_queue_drain
16 libdispatch.dylib 0x16284 _dispatch_worker_thread2
17 libsystem_pthread.dylib 0xdbc _pthread_wqthread
18 libsystem_pthread.dylib 0xb98 start_wqthread

```

### Reproducing the issue

We see these reports in production and have not been able to reproduce locally in lab environment, we believe an integration test can be written as follows:

Pre-condition: ensure transaction auto-retries are enabled

1. Start a transaction
2. Get document
3. Write a document
4. Interrupt the connection BEFORE the transaction commit invokes the result callback

The resulting backtrace suggests the following theory of failure:

The assertion is thrown here:
```
void Transaction::EnsureCommitNotCalled() {
HARD_ASSERT(!committed_,
"A transaction object cannot be used after its "
"update callback has been invoked.");
}
```

The assertion checks against `comitted_` flag which is set only in only place (`Transaction::Commit`) but appears to be set prematurely:

```
void Transaction::Commit(util::StatusCallback&& callback) {
...

committed_ = true; // <--- Too early!

std::shared_ptr datastore = datastore_.lock();
if (!datastore) {
callback(Status(Error::kErrorFailedPrecondition,
"The client has already been terminated."));
return;
}

datastore->CommitMutations(mutations_, std::move(callback));
}
```

The last line of `Transaction::Commit` performs the action commit. However, if connection is interrupted between the beginning of the function and the actual transaction write, we end up with _comitted flag set.

At this point the transaction runner will retry. At step 2 in the above test case it will assert because it erroneously considers that the transaction has been committed.

It appears that `datastore->CommitMutations()` is itself an asynchronous function, so in order to properly set _comitted flag, we may have to wrap it within a lambda function instead of moving instead of committed_ = true; so probably something like this:
```
datastore->CommitMutations(mutations_,
[callback, this] (util::Status status){
if(status.ok()) {
this->committed_ = true;
}
callback(status);
```

For reference, here is the transaction runner:

```
void TransactionRunner::Run() {
queue_->VerifyIsCurrentQueue();
attempts_remaining_ -= 1;

auto shared_this = this->shared_from_this();
backoff_.BackoffAndRun([shared_this] {
std::shared_ptr transaction =
shared_this->remote_store_->CreateTransaction();
shared_this->update_callback_(
transaction, [transaction, shared_this](const util::Status& status) {
shared_this->queue_->Enqueue([transaction, shared_this, status] {
shared_this->ContinueCommit(transaction, status);
});
});
});
}
```

I originally discovered and commented on here:
https://github.com/firebase/firebase-ios-sdk/commit/58c75667065bb42750bc19be356ec8a71f554306

### Firebase SDK Version

10.4.0 and earlier

### Xcode Version

14.1

### Installation Method

CocoaPods

### Firebase Product(s)

Firestore

### Targeted Platforms

iOS

### Relevant Log Output

_No response_

### If using Swift Package Manager, the project's Package.resolved

Expand Package.resolved snippet

```json

Replace this line with the contents of your Package.resolved.

```

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Expand Podfile.lock snippet

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- abseil/strings/cord_internal
- abseil/strings/cordz_info
- abseil/strings/cordz_update_tracker
- abseil/strings/cordz_update_tracker (1.20211102.0):
- abseil/base/config
- abseil/strings/internal (1.20211102.0):
- abseil/base/config
- abseil/base/core_headers
- abseil/base/endian
- abseil/base/raw_logging_internal
- abseil/meta/type_traits
- abseil/strings/str_format (1.20211102.0):
- abseil/strings/str_format_internal
- abseil/strings/str_format_internal (1.20211102.0):
- abseil/base/config
- abseil/base/core_headers
- abseil/functional/function_ref
- abseil/meta/type_traits
- abseil/numeric/bits
- abseil/numeric/int128
- abseil/numeric/representation
- abseil/strings/strings
- abseil/types/optional
- abseil/types/span
- abseil/strings/strings (1.20211102.0):
- abseil/base/base
- abseil/base/config
- abseil/base/core_headers
- abseil/base/endian
- abseil/base/raw_logging_internal
- abseil/base/throw_delegate
- abseil/memory/memory
- abseil/meta/type_traits
- abseil/numeric/bits
- abseil/numeric/int128
- abseil/strings/internal
- abseil/synchronization/graphcycles_internal (1.20211102.0):
- abseil/base/base
- abseil/base/base_internal
- abseil/base/config
- abseil/base/core_headers
- abseil/base/malloc_internal
- abseil/base/raw_logging_internal
- abseil/synchronization/kernel_timeout_internal (1.20211102.0):
- abseil/base/core_headers
- abseil/base/raw_logging_internal
- abseil/time/time
- abseil/synchronization/synchronization (1.20211102.0):
- abseil/base/atomic_hook
- abseil/base/base
- abseil/base/base_internal
- abseil/base/config
- abseil/base/core_headers
- abseil/base/dynamic_annotations
- abseil/base/malloc_internal
- abseil/base/raw_logging_internal
- abseil/debugging/stacktrace
- abseil/debugging/symbolize
- abseil/synchronization/graphcycles_internal
- abseil/synchronization/kernel_timeout_internal
- abseil/time/time
- abseil/time (1.20211102.0):
- abseil/time/internal (= 1.20211102.0)
- abseil/time/time (= 1.20211102.0)
- abseil/time/internal (1.20211102.0):
- abseil/time/internal/cctz (= 1.20211102.0)
- abseil/time/internal/cctz (1.20211102.0):
- abseil/time/internal/cctz/civil_time (= 1.20211102.0)
- abseil/time/internal/cctz/time_zone (= 1.20211102.0)
- abseil/time/internal/cctz/civil_time (1.20211102.0):
- abseil/base/config
- abseil/time/internal/cctz/time_zone (1.20211102.0):
- abseil/base/config
- abseil/time/internal/cctz/civil_time
- abseil/time/time (1.20211102.0):
- abseil/base/base
- abseil/base/core_headers
- abseil/base/raw_logging_internal
- abseil/numeric/int128
- abseil/strings/strings
- abseil/time/internal/cctz/civil_time
- abseil/time/internal/cctz/time_zone
- abseil/types (1.20211102.0):
- abseil/types/any (= 1.20211102.0)
- abseil/types/bad_any_cast (= 1.20211102.0)
- abseil/types/bad_any_cast_impl (= 1.20211102.0)
- abseil/types/bad_optional_access (= 1.20211102.0)
- abseil/types/bad_variant_access (= 1.20211102.0)
- abseil/types/compare (= 1.20211102.0)
- abseil/types/optional (= 1.20211102.0)
- abseil/types/span (= 1.20211102.0)
- abseil/types/variant (= 1.20211102.0)
- abseil/types/any (1.20211102.0):
- abseil/base/config
- abseil/base/core_headers
- abseil/base/fast_type_id
- abseil/meta/type_traits
- abseil/types/bad_any_cast
- abseil/utility/utility
- abseil/types/bad_any_cast (1.20211102.0):
- abseil/base/config
- abseil/types/bad_any_cast_impl
- abseil/types/bad_any_cast_impl (1.20211102.0):
- abseil/base/config
- abseil/base/raw_logging_internal
- abseil/types/bad_optional_access (1.20211102.0):
- abseil/base/config
- abseil/base/raw_logging_internal
- abseil/types/bad_variant_access (1.20211102.0):
- abseil/base/config
- abseil/base/raw_logging_internal
- abseil/types/compare (1.20211102.0):
- abseil/base/core_headers
- abseil/meta/type_traits
- abseil/types/optional (1.20211102.0):
- abseil/base/base_internal
- abseil/base/config
- abseil/base/core_headers
- abseil/memory/memory
- abseil/meta/type_traits
- abseil/types/bad_optional_access
- abseil/utility/utility
- abseil/types/span (1.20211102.0):
- abseil/algorithm/algorithm
- abseil/base/core_headers
- abseil/base/throw_delegate
- abseil/meta/type_traits
- abseil/types/variant (1.20211102.0):
- abseil/base/base_internal
- abseil/base/config
- abseil/base/core_headers
- abseil/meta/type_traits
- abseil/types/bad_variant_access
- abseil/utility/utility
- abseil/utility/utility (1.20211102.0):
- abseil/base/base_internal
- abseil/base/config
- abseil/meta/type_traits
- BoringSSL-GRPC (0.0.24):
- BoringSSL-GRPC/Implementation (= 0.0.24)
- BoringSSL-GRPC/Interface (= 0.0.24)
- BoringSSL-GRPC/Implementation (0.0.24):
- BoringSSL-GRPC/Interface (= 0.0.24)
- BoringSSL-GRPC/Interface (0.0.24)
- FirebaseCore (10.5.0):
- FirebaseCoreInternal (~> 10.0)
- GoogleUtilities/Environment (~> 7.8)
- GoogleUtilities/Logger (~> 7.8)
- FirebaseCoreExtension (10.5.0):
- FirebaseCore (~> 10.0)
- FirebaseCoreInternal (10.5.0):
- "GoogleUtilities/NSData+zlib (~> 7.8)"
- FirebaseFirestore (10.5.0):
- abseil/algorithm (~> 1.20211102.0)
- abseil/base (~> 1.20211102.0)
- abseil/container/flat_hash_map (~> 1.20211102.0)
- abseil/memory (~> 1.20211102.0)
- abseil/meta (~> 1.20211102.0)
- abseil/strings/strings (~> 1.20211102.0)
- abseil/time (~> 1.20211102.0)
- abseil/types (~> 1.20211102.0)
- FirebaseCore (~> 10.0)
- "gRPC-C++ (~> 1.44.0)"
- leveldb-library (~> 1.22)
- nanopb (< 2.30910.0, >= 2.30908.0)
- FirebaseFirestoreSwift (10.5.0):
- FirebaseCore (~> 10.0)
- FirebaseCoreExtension (~> 10.0)
- FirebaseFirestore (~> 10.0)
- FirebaseSharedSwift (~> 10.0)
- FirebaseSharedSwift (10.5.0)
- GoogleBenchmark (1.5.0)
- GoogleTest (99.99.99)
- GoogleUtilities/Environment (7.11.0):
- PromisesObjC (< 3.0, >= 1.2)
- GoogleUtilities/Logger (7.11.0):
- GoogleUtilities/Environment
- "GoogleUtilities/NSData+zlib (7.11.0)"
- "gRPC-C++ (1.44.0)":
- "gRPC-C++/Implementation (= 1.44.0)"
- "gRPC-C++/Interface (= 1.44.0)"
- "gRPC-C++/Implementation (1.44.0)":
- abseil/base/base (= 1.20211102.0)
- abseil/base/core_headers (= 1.20211102.0)
- abseil/container/flat_hash_map (= 1.20211102.0)
- abseil/container/inlined_vector (= 1.20211102.0)
- abseil/functional/bind_front (= 1.20211102.0)
- abseil/hash/hash (= 1.20211102.0)
- abseil/memory/memory (= 1.20211102.0)
- abseil/random/random (= 1.20211102.0)
- abseil/status/status (= 1.20211102.0)
- abseil/status/statusor (= 1.20211102.0)
- abseil/strings/cord (= 1.20211102.0)
- abseil/strings/str_format (= 1.20211102.0)
- abseil/strings/strings (= 1.20211102.0)
- abseil/synchronization/synchronization (= 1.20211102.0)
- abseil/time/time (= 1.20211102.0)
- abseil/types/optional (= 1.20211102.0)
- abseil/types/variant (= 1.20211102.0)
- abseil/utility/utility (= 1.20211102.0)
- "gRPC-C++/Interface (= 1.44.0)"
- gRPC-Core (= 1.44.0)
- "gRPC-C++/Interface (1.44.0)"
- gRPC-Core (1.44.0):
- gRPC-Core/Implementation (= 1.44.0)
- gRPC-Core/Interface (= 1.44.0)
- gRPC-Core/Implementation (1.44.0):
- abseil/base/base (= 1.20211102.0)
- abseil/base/core_headers (= 1.20211102.0)
- abseil/container/flat_hash_map (= 1.20211102.0)
- abseil/container/inlined_vector (= 1.20211102.0)
- abseil/functional/bind_front (= 1.20211102.0)
- abseil/hash/hash (= 1.20211102.0)
- abseil/memory/memory (= 1.20211102.0)
- abseil/random/random (= 1.20211102.0)
- abseil/status/status (= 1.20211102.0)
- abseil/status/statusor (= 1.20211102.0)
- abseil/strings/cord (= 1.20211102.0)
- abseil/strings/str_format (= 1.20211102.0)
- abseil/strings/strings (= 1.20211102.0)
- abseil/synchronization/synchronization (= 1.20211102.0)
- abseil/time/time (= 1.20211102.0)
- abseil/types/optional (= 1.20211102.0)
- abseil/types/variant (= 1.20211102.0)
- abseil/utility/utility (= 1.20211102.0)
- BoringSSL-GRPC (= 0.0.24)
- gRPC-Core/Interface (= 1.44.0)
- Libuv-gRPC (= 0.0.10)
- gRPC-Core/Interface (1.44.0)
- leveldb-library (1.22.1)
- LibFuzzer (1.0)
- Libuv-gRPC (0.0.10):
- Libuv-gRPC/Implementation (= 0.0.10)
- Libuv-gRPC/Interface (= 0.0.10)
- Libuv-gRPC/Implementation (0.0.10):
- Libuv-gRPC/Interface (= 0.0.10)
- Libuv-gRPC/Interface (0.0.10)
- nanopb (2.30909.0):
- nanopb/decode (= 2.30909.0)
- nanopb/encode (= 2.30909.0)
- nanopb/decode (2.30909.0)
- nanopb/encode (2.30909.0)
- PromisesObjC (2.1.1)
- ProtobufCpp (3.11.4)

DEPENDENCIES:
- FirebaseCore (from `../..`)
- FirebaseCoreExtension (from `../..`)
- FirebaseCoreInternal (from `../..`)
- FirebaseFirestore (from `../..`)
- FirebaseFirestoreSwift (from `../../`)
- FirebaseSharedSwift (from `../../`)
- GoogleBenchmark (from `GoogleBenchmark.podspec`)
- GoogleTest (from `GoogleTest.podspec`)
- leveldb-library
- LibFuzzer (from `LibFuzzer.podspec`)
- ProtobufCpp (from `ProtobufCpp.podspec`)

SPEC REPOS:
trunk:
- abseil
- BoringSSL-GRPC
- GoogleUtilities
- "gRPC-C++"
- gRPC-Core
- leveldb-library
- Libuv-gRPC
- nanopb
- PromisesObjC

EXTERNAL SOURCES:
FirebaseCore:
:path: "../.."
FirebaseCoreExtension:
:path: "../.."
FirebaseCoreInternal:
:path: "../.."
FirebaseFirestore:
:path: "../.."
FirebaseFirestoreSwift:
:path: "../../"
FirebaseSharedSwift:
:path: "../../"
GoogleBenchmark:
:podspec: GoogleBenchmark.podspec
GoogleTest:
:podspec: GoogleTest.podspec
LibFuzzer:
:podspec: LibFuzzer.podspec
ProtobufCpp:
:podspec: ProtobufCpp.podspec

CHECKOUT OPTIONS:
LibFuzzer:
:commit: 4626bd0b91102af234125f7f8ff0daaffb7a1fa4
:git: https://github.com/llvm/llvm-project.git

SPEC CHECKSUMS:
abseil: ebe5b5529fb05d93a8bdb7951607be08b7fa71bc
BoringSSL-GRPC: 3175b25143e648463a56daeaaa499c6cb86dad33
FirebaseCore: 324b8d182d9ff7e3f6d1fa2f04b082d1c7a3e366
FirebaseCoreExtension: d9fa427f1ae1edccf2368ce5e8d567e4c1f0ebc8
FirebaseCoreInternal: e463f41bb935cd049505bf7e9a5bdd7dcea90df6
FirebaseFirestore: 7785ee9fe192f736fdb9f5d14a451ba0b33c3005
FirebaseFirestoreSwift: 3f63a09244cf0dc5e19072c13618446c686b05b6
FirebaseSharedSwift: 30289ed76ccb441067a2cd3472cc5b2f491b9d8f
GoogleBenchmark: cf1f83beb67a519251fcc4026876a665966e8b6b
GoogleTest: 3768a5de0867ab88af66e86117030466d313f485
GoogleUtilities: c2bdc4cf2ce786c4d2e6b3bcfd599a25ca78f06f
"gRPC-C++": 9675f953ace2b3de7c506039d77be1f2e77a8db2
gRPC-Core: 943e491cb0d45598b0b0eb9e910c88080369290b
leveldb-library: 50c7b45cbd7bf543c81a468fe557a16ae3db8729
LibFuzzer: 5d026ad5b27314c02b1d8e8440de43ec35382710
Libuv-gRPC: 55e51798e14ef436ad9bc45d12d43b77b49df378
nanopb: b552cce312b6c8484180ef47159bc0f65a1f0431
PromisesObjC: ab77feca74fa2823e7af4249b8326368e61014cb
ProtobufCpp: 3e2fbf7f779e13869e8065a46b77a0e4c1db4f04

PODFILE CHECKSUM: e0ea8e0c3ec38137252f85cf75983e473cbf9219

COCOAPODS: 1.11.3

```

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