Multiple crashes: realm::Node::do_copy_on_write(unsigned long)

[NZQN23]

Hi,

I am currently experiencing multiple crashes with Realm 10.28.6. They are all happening on iOS 16.

Crash stack is mostly similar to his one:

0   libsystem_platform.dylib      	0x0000000224941930 _platform_memmove + 96
1   Realm                         	0x000000010355f4bc realm::Node::do_copy_on_write(unsigned long) + 152
2   Realm                         	0x00000001034e3bc4 realm::BasicArrayNull<double>::insert(unsigned long, std::__1::optional<double>) + 76
3   Realm                         	0x00000001034e28dc void realm::Cluster::do_insert_row<realm::BasicArrayNull<double> >(unsigned long, realm::ColKey, realm::Mixed, bool) + 164
4   Realm                         	0x00000001034e21d8 realm::util::FunctionRef<bool (realm::ColKey)>::FunctionRef<realm::Cluster::insert_row(unsigned long, realm::ObjKey, realm::FieldValues const&)::$_1&>(realm::Cluster::insert_row(unsigned long, real... + 676
5   Realm                         	0x0000000103621cfc realm::TableClusterTree::for_each_and_every_column(realm::util::FunctionRef<bool (realm::ColKey)>) const + 84
6   Realm                         	0x00000001034dd74c realm::Cluster::insert_row(unsigned long, realm::ObjKey, realm::FieldValues const&) + 208
7   Realm                         	0x00000001034df70c realm::Cluster::insert(realm::ObjKey, realm::FieldValues const&, realm::ClusterNode::State&) + 240
8   Realm                         	0x00000001034ef86c realm::ClusterNodeInner::insert(realm::ObjKey, realm::FieldValues const&, realm::ClusterNode::State&)::$_1::operator()(realm::ClusterNode*, realm::ClusterNodeInner::ChildInfo&) const + 72
9   Realm                         	0x00000001034eab00 realm::ClusterNodeInner::insert(realm::ObjKey, realm::FieldValues const&, realm::ClusterNode::State&) + 232
10  Realm                         	0x00000001034ee350 realm::ClusterTree::insert_fast(realm::ObjKey, realm::FieldValues const&, realm::ClusterNode::State&) + 48
11  Realm                         	0x00000001034ee5ac realm::ClusterTree::insert(realm::ObjKey, realm::FieldValues const&) + 48
12  Realm                         	0x0000000103621848 realm::TableClusterTree::insert(realm::ObjKey, realm::FieldValues const&) + 52
13  Realm                         	0x0000000103614e94 realm::Table::create_object_with_primary_key(realm::Mixed const&, realm::FieldValues&&, realm::Table::UpdateMode, bool*) + 860
14  Realm                         	0x00000001033734e0 realm::Table::create_object_with_primary_key(realm::Mixed const&, bool*) + 80 (table.hpp:260)
15  Realm                         	0x00000001033686cc realm::Object realm::Object::create<objc_object* __strong, RLMAccessorContext>(RLMAccessorContext&, std::__1::shared_ptr<realm::Realm> const&, realm::ObjectSchema const&, objc_object* __strong, rea... + 616 (object_accessor.hpp:305)
16  Realm                         	0x0000000103368068 RLMAccessorContext::createObject(objc_object*, realm::CreatePolicy, bool, realm::ObjKey) + 940 (RLMAccessor.mm:1102)
17  Realm                         	0x00000001033c08c0 RLMAddObjectToRealm + 200 (RLMObjectStore.mm:119)
18  RealmSwift                    	0x0000000103ad99d4 add + 16 (Realm.swift:540)
19  RealmSwift                    	0x0000000103ad99d4 Realm.add<A>(_:update:) + 284 (Realm.swift:564)
20  Geory                         	0x0000000102e48348 partial apply for closure #1 in closure #1 in closure #1 in writeObjectsToDatabase(qos:objectsToWrite:completion:) + 96 (DatabaseManagement.swift:52)
21  Geory                         	0x0000000102dfe458 thunk for @callee_guaranteed () -> (@error @owned Error) + 20 (<compiler-generated>:0)
22  Geory                         	0x0000000102e482e0 partial apply for thunk for @callee_guaranteed () -> (@error @owned Error) + 16 (<compiler-generated>:0)
23  Geory                         	0x0000000102e4ac24 thunk for @callee_guaranteed () -> (@error @owned Error)partial apply + 12
24  RealmSwift                    	0x0000000103ad8dec Realm.write<A>(withoutNotifying:_:) + 180 (Realm.swift:258)
25  Geory                         	0x0000000102e47e28 closure #1 in closure #1 in writeObjectsToDatabase(qos:objectsToWrite:completion:) + 916 (DatabaseManagement.swift:50)
26  Geory                         	0x0000000102dfe458 thunk for @callee_guaranteed () -> (@error @owned Error) + 20 (<compiler-generated>:0)
27  Geory                         	0x0000000102e482e0 partial apply for thunk for @callee_guaranteed () -> (@error @owned Error) + 16 (<compiler-generated>:0)
28  libswiftObjectiveC.dylib      	0x00000001feab7308 autoreleasepool<A>(invoking:) + 64 (ObjectiveC.swift:184)
29  Geory                         	0x0000000102e4a7e8 partial apply for closure #1 in writeObjectsToDatabase(qos:objectsToWrite:completion:) + 72
30  Geory                         	0x0000000102dfe164 thunk for @escaping @callee_guaranteed () -> () + 28 (<compiler-generated>:0)
31  libdispatch.dylib             	0x00000001df8044b4 _dispatch_call_block_and_release + 32 (init.c:1518)
32  libdispatch.dylib             	0x00000001df805fdc _dispatch_client_callout + 20 (object.m:560)
33  libdispatch.dylib             	0x00000001df817b8c _dispatch_root_queue_drain + 684 (inline_internal.h:2632)
34  libdispatch.dylib             	0x00000001df818284 _dispatch_worker_thread2 + 164 (queue.c:7052)
35  libsystem_pthread.dylib       	0x00000002249d5dbc _pthread_wqthread + 228 (pthread.c:2631)
36  libsystem_pthread.dylib       	0x00000002249d5b98 start_wqthread + 8 (:-1)

I'd be very grateful if you could give any advice on how to deal with this issue.

Thank you!

[jedelbo]

Hi @NZQN23 . Thank you for reporting this. Could you give other examples? Do they all have memmove on the top of the stack?

[NZQN23]

Hi @jedelbo , yes. They all have the identical first two lines "platform_memmove" and "realm::Node::do_copy_on_write(unsigned long)" on top of the stack.

[jedelbo]

@NZQN23 Thanks - we will investigate

[jedelbo]

Closed by #5993