Crashes when synchronizing in the background

[lucatorella]

I'm using background fetch to regularly synchronize the database in the background. Anyway I'm seeing sometimes some crashes. Is background fetch supposed to work?

This is one:

Crashed: Thread
SIGABRT ABORT 0x0000000182b4411c

0  libsystem_kernel.dylib         0x182b4411c __pthread_kill + 8
1  libsystem_pthread.dylib        0x182c10ef8 pthread_kill + 112
2  libsystem_c.dylib              0x182ab5dac abort + 140
3  libsystem_malloc.dylib         0x182b70374 szone_size + 522
4  MyApp                          0x100213088 btreeblk_free + 4297552008
5  MyApp                          0x10022ff2c _fdb_close + 14516
6  MyApp                          0x10022e984 fdb_check_file_reopen + 8972
7  MyApp                          0x10023c52c fdb_kvs_open + 23632
8  MyApp                          0x1001eff88 cbforest::Database::getKeyStore(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >) const (Error.hh:58)
9  MyApp                          0x1001f0268 cbforest::Database::updatePurgeCount() (Database.cc:220)
10 MyApp                          0x1001efcf0 cbforest::Database::compactionCallback(_fdb_file_handle*, unsigned int, char const*, fdb_doc_struct*, unsigned long long, unsigned long long, void*) (Database.cc:399)
11 MyApp                          0x1002336e8 _fdb_compact_file(_fdb_kvs_handle*, filemgr*, btreeblk_handle*, docio_handle*, hbtrie*, hbtrie*, btree*, btree*, unsigned long long, bool) + 28784
12 MyApp                          0x100231e44 fdb_compact_file + 22476
13 MyApp                          0x10021ea10 compactor_thread(void*) + 18468
14 libsystem_pthread.dylib        0x182c0fb28 _pthread_body + 156
15 libsystem_pthread.dylib        0x182c0fa8c _pthread_body + 154
16 libsystem_pthread.dylib        0x182c0d028 thread_start + 4

This is another one:

#11. Crashed: com.MyCompany.MyApp.couchbase
EXC_BAD_ACCESS KERN_INVALID_ADDRESS 0x0000000000000028

0  MyApp                          0x1002cc7b4 list_pop_front + 316
1  MyApp                          0x1002b33c0 _btreeblk_read(void*, unsigned long long, int) + 4297143232
2  MyApp                          0x1002d7020 btree_init_from_bid + 1860
3  MyApp                          0x1002cec18 fdb_sync_db_header + 9632
4  MyApp                          0x1002b3874 fdb_begin_transaction + 4297144436
5  MyApp                          0x1002904b0 cbforest::Database::beginTransaction(cbforest::Transaction*) (Database.cc:283)
6  MyApp                          0x1002906fc cbforest::Transaction::Transaction(cbforest::Database*) (Database.cc:325)
7  MyApp                          0x100298c38 cbforest::MapReduceIndexer::addIndex(cbforest::MapReduceIndex*) (MapReduceIndex.cc:324)
8  MyApp                          0x1002ab034 c4indexer_begin (c4View.cc:265)
9  MyApp                          0x10028a2a0 -[CBL_ForestDBViewStorage updateIndexes:] (CBL_ForestDBViewStorage.mm:339)
10 MyApp                          0x1003140b0 -[CBLView updateIndexes:] (CBLView.m:287)
11 MyApp                          0x100313c48 -[CBLView _updateIndex] (CBLView.m:258)
12 MyApp                          0x10033dd44 -[CBLDatabase(Views) queryViewNamed:options:ifChangedSince:status:] (CBLQuery.m:488)
13 MyApp                          0x10033c644 -[CBLQuery run:] (CBLQuery.m:219)
14 MyApp                          0x100274af8 specialized Indexer.(updateConfig(StorageConfig) -> ()).(closure #1) (Indexer.swift:123)
15 libdispatch.dylib              0x1829f54bc _dispatch_call_block_and_release + 24
16 libdispatch.dylib              0x1829f547c _dispatch_client_callout + 16
17 libdispatch.dylib              0x182a014c0 _dispatch_queue_drain + 864
18 libdispatch.dylib              0x1829f8f80 _dispatch_queue_invoke + 464
19 libdispatch.dylib              0x182a03390 _dispatch_root_queue_drain + 728
20 libdispatch.dylib              0x182a030b0 _dispatch_worker_thread3 + 112
21 libsystem_pthread.dylib        0x182c0d470 _pthread_wqthread + 1092
22 libsystem_pthread.dylib        0x182c0d020 start_wqthread + 4

---

Version: 1.2.2
Client OS: iOS 9.3.2
Server: couchDB

[basememara]

Duplicate but critical: #1422

[snej]

It definitely seems that this is caused by iOS file protection refusing access to the file, but of course this shouldn't be triggering crashes inside ForestDB. I think the file errors may be triggering some edge cases there.

[snej]

Filed a bug report against ForestDB: MB-20944.

[jayahariv]

Closing 1.x issue!