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Data race detected when compiling app under TSan #289
Description
Hello Team,
running the app under TSan results in the following data race, i can't verify if it's causing crashes/inconstancies on prod, but in general data races could cause issues.
most likely we need a synchronised NSDictionary
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�[1m�[31mWARNING: ThreadSanitizer: data race (pid=69950)
�[1m�[0m�[1m�[34m Read of size 8 at 0x000158142c50 by thread T13:
�[1m�[0m
#0 __54-[NSDictionary(MPCaseInsensitive) caseInsensitiveKey:]_block_invoke NSDictionary+MPCaseInsensitive.m:16 (mParticle_Apple_SDK:arm64+0x1f53d4)
#1 __NSARRAY_IS_CALLING_OUT_TO_A_BLOCK__ <null>:584394248 (CoreFoundation:arm64+0x91c04)
#2 _dispatch_client_callout2 <null>:584394248 (libdispatch.dylib:arm64+0x39b0)
�[1m�[34m Previous write of size 8 at 0x000158142c50 by thread T7:
�[1m�[0m #0 __copy_helper_block_e8_32s40r mParticle.m (mParticle_Apple_SDK:arm64+0x33620)
#1 _call_copy_helpers_excp <null>:584394248 (libsystem_blocks.dylib:arm64+0x10b4)
#2 __NSCollectionHandleConcurrentEnumerationIfSpecified <null>:584394248 (CoreFoundation:arm64+0x15157c)
#3 -[MPBackendController setUserAttributeChange:completionHandler:] MPBackendController.m:544 (mParticle_Apple_SDK:arm64+0x57a0c)
#4 -[MPBackendController setUserAttribute:value:timestamp:completionHandler:] MPBackendController.m:1726 (mParticle_Apple_SDK:arm64+0x6b014)
#5 __40-[MParticleUser setUserAttribute:value:]_block_invoke MParticleUser.m:286 (mParticle_Apple_SDK:arm64+0x425a8)
#6 __tsan::invoke_and_release_block(void*) <null>:584394248 (libclang_rt.tsan_iossim_dynamic.dylib:arm64+0x77ee0)
#7 _dispatch_client_callout <null>:584394248 (libdispatch.dylib:arm64+0x3974)
�[1m�[32m Location is heap block of size 48 at 0x000158142c30 allocated by thread T7:
�[1m�[0m #0 malloc <null>:584394248 (libclang_rt.tsan_iossim_dynamic.dylib:arm64+0x4fa48)
#1 _malloc_type_malloc_outlined <null>:584394248 (libsystem_malloc.dylib:arm64+0xf3ec)
#2 __NSCollectionHandleConcurrentEnumerationIfSpecified <null>:584394248 (CoreFoundation:arm64+0x15157c)
#3 -[MPBackendController setUserAttributeChange:completionHandler:] MPBackendController.m:544 (mParticle_Apple_SDK:arm64+0x57a0c)
#4 -[MPBackendController setUserAttribute:value:timestamp:completionHandler:] MPBackendController.m:1726 (mParticle_Apple_SDK:arm64+0x6b014)
#5 __40-[MParticleUser setUserAttribute:value:]_block_invoke MParticleUser.m:286 (mParticle_Apple_SDK:arm64+0x425a8)
#6 __tsan::invoke_and_release_block(void*) <null>:584394248 (libclang_rt.tsan_iossim_dynamic.dylib:arm64+0x77ee0)
#7 _dispatch_client_callout <null>:584394248 (libdispatch.dylib:arm64+0x3974)
�[1m�[36m Thread T13 (tid=12827004, running) is a GCD worker thread
�[1m�[0m�[1m�[36m Thread T7 (tid=12826816, running) is a GCD worker thread
�[1m�[0mSUMMARY: ThreadSanitizer: data race NSDictionary+MPCaseInsensitive.m:16 in __54-[NSDictionary(MPCaseInsensitive) caseInsensitiveKey:]_block_invoke
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[-]Data race detected when ompiling app under TSan[/-][+]Data race detected when compiling app under TSan[/+]