ref: Disable Async Stacktraces

Due to some problems with arm64 devices, we disable this feature until we find out how to fix them.
We don't want this feature to block 7.0.0 GA. The plan is to add a flag to SentryOptions for enabling
and disabling this feature in the future, see #1086.

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## Unreleased
+
+- ref: Disable Async Stacktraces (#1087)
+
 ## 7.0.0-beta.1
 
 ### Features and Fixes

Sources/Sentry/SentryCrashIntegration.m

@@ -74,7 +74,8 @@ - (void)installWithOptions:(nonnull SentryOptions *)options
                                                  outOfMemoryLogic:logic];
 
     [self startCrashHandler];
-    sentrycrash_install_async_hooks();
+    // TODO: enable with feature flag from SentryOptions because this is still experimental
+    //    sentrycrash_install_async_hooks();
     [self configureScope];
 }
 

Sources/SentryCrash/Recording/Tools/SentryHook.c

@@ -25,11 +25,14 @@ static pthread_key_t async_caller_key = 0;
 sentrycrash_async_backtrace_t *
 sentrycrash_get_async_caller_for_thread(SentryCrashThread thread)
 {
-    const pthread_t pthread = pthread_from_mach_thread_np((thread_t)thread);
-    void **tsd_slots = (void *)((uint8_t *)pthread + TSD_OFFSET);
+    return NULL;
 
-    return (sentrycrash_async_backtrace_t *)__atomic_load_n(
-        &tsd_slots[async_caller_key], __ATOMIC_SEQ_CST);
+    // TODO: Disabled because still experimental.
+    //    const pthread_t pthread = pthread_from_mach_thread_np((thread_t)thread);
+    //    void **tsd_slots = (void *)((uint8_t *)pthread + TSD_OFFSET);
+    //
+    //    return (sentrycrash_async_backtrace_t *)__atomic_load_n(
+    //        &tsd_slots[async_caller_key], __ATOMIC_SEQ_CST);
 }
 
 void