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Type:
Bug
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Resolution: Fixed
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Priority:
Critical - P2
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None
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Affects Version/s: None
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Component/s: None
SDK and version
SDK : .NET
Version: 10.15.1
Core: 12.5.0
Observations
- How frequent do the crash occur?
- Rarely
- Does it happen in production or during dev/test?
- dev/test
- Can the crash be reproduced by you?
- Occasionally
- Can you provide instructions for how we can reproduce it?
- No, there's no consistent pattern
Crash log / stacktrace
#0 0x000001a83a27cc in pthread_mutex_lock #1 0xdb348001a82f91a8 in std::__1::mutex::lock() #2 0x75630002f014a9c0 in realm::SyncManager::unregister_session(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) #3 0x000002f01586a0 in std::__1::__shared_ptr_emplace<realm::SyncSession::ExternalReference, std::__1::allocator<realm::SyncSession::ExternalReference> >::__on_zero_shared() #4 0x000002f0048730 in realm_syncsession_destroy #5 0x000002fb03adac in (wrapper managed-to-native) Realms.Sync.SessionHandle/NativeMethods:destroy (intptr) [{0x2f5156460} + 0x6c] (0x2fb03ad40 0x2fb03ae0c) [0x130f02a80 - Unity Child Domain] #6 0x000002fb03ab10 in Realms.Sync.SessionHandle:Unbind () [{0x2f57e4988} + 0x20] (0x2fb03aaf0 0x2fb03ab20) [0x130f02a80 - Unity Child Domain] #7 0x000002fb03a990 in Realms.SharedRealmHandle:UnbindLockedList () [{0x2b221bf00} + 0x68] (0x2fb03a928 0x2fb03aa20) [0x130f02a80 - Unity Child Domain] #8 0x000002fb03a4c4 in Realms.SharedRealmHandle:ReleaseHandle () [{0x2e6c681a0} + 0xa4] (0x2fb03a420 0x2fb03a5ec) [0x130f02a80 - Unity Child Domain] #9 0x000002f9662108 in System.Runtime.InteropServices.SafeHandle:DangerousReleaseInternal (bool) [{0x14238f6f8} + 0x218] (0x2f9661ef0 0x2f9662128) [0x130f02a80 - Unity Child Domain] #10 0x000002faf5c4c4 in System.Runtime.InteropServices.SafeHandle:InternalFinalize () [{0x141cad768} + 0x24] (0x2faf5c4a0 0x2faf5c4d4) [0x130f02a80 - Unity Child Domain] #11 0x000002faeb7bf0 in System.Runtime.InteropServices.SafeHandle:Dispose (bool) [{0x14238ea38} + 0x30] (0x2faeb7bc0 0x2faeb7c00) [0x130f02a80 - Unity Child Domain] #12 0x000002faf5c434 in System.Runtime.InteropServices.SafeHandle:Finalize () [{0x14238e9c0} + 0x24] (0x2faf5c410 0x2faf5c46c) [0x130f02a80 - Unity Child Domain] #13 0x000002f9739704 in (wrapper runtime-invoke) object:runtime_invoke_virtual_void__this__ (object,intptr,intptr,intptr) [{0x141959e98} + 0x74] (0x2f9739690 0x2f97397a4) [0x130f02a80 - Unity Child Domain] #14 0x00000135a74728 in mono_gc_run_finalize #15 0x00000135a763d4 in finalizer_thread #16 0x00000135a3d570 in start_wrapper_internal #17 0x00000135a3d41c in start_wrapper #18 0x00000135abccb0 in GC_inner_start_routine #19 0x00000135abcc38 in GC_start_routine #20 0x000001a83a826c in _pthread_start
Steps & Code to Reproduce
Happens in Unity when I reload the assembly. This causes the finalizer to collect all C# instances, which in turn release any shared pointers they were holding. Based on the stacktrace, when destroying a sync session, it tries to unregister from the manager and a mutex fails to lock. I don't know what the reason for that could be, but I figured someone on the Core team might.
