[compiler-rt] [TSan] Fix deadlocks during TSan error reporting on Apple platforms (PR #151495)

[Vitaly Buka via llvm-commits]

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@@ -528,53 +543,81 @@ void AfterSleep(ThreadState *thr, uptr pc) {
 void ReportDeadlock(ThreadState *thr, uptr pc, DDReport *r) {
   if (r == 0 || !ShouldReport(thr, ReportTypeDeadlock))
     return;
-  ThreadRegistryLock l(&ctx->thread_registry);
-  ScopedReport rep(ReportTypeDeadlock);
-  for (int i = 0; i < r->n; i++) {
-    rep.AddMutex(r->loop[i].mtx_ctx0, r->loop[i].stk[0]);
-    rep.AddUniqueTid((int)r->loop[i].thr_ctx);
-    rep.AddThread((int)r->loop[i].thr_ctx);
-  }
-  uptr dummy_pc = 0x42;
-  for (int i = 0; i < r->n; i++) {
-    for (int j = 0; j < (flags()->second_deadlock_stack ? 2 : 1); j++) {
-      u32 stk = r->loop[i].stk[j];
-      StackTrace stack;
-      if (stk && stk != kInvalidStackID) {
-        stack = StackDepotGet(stk);
-      } else {
-        // Sometimes we fail to extract the stack trace (FIXME: investigate),
-        // but we should still produce some stack trace in the report.
-        stack = StackTrace(&dummy_pc, 1);
+  // Use alloca, because malloc during signal handling deadlocks
+  ScopedReport *rep = (ScopedReport *)__builtin_alloca(sizeof(ScopedReport));
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vitalybuka wrote:

> // Use alloca, because malloc during signal

but it was using stack?

https://github.com/llvm/llvm-project/pull/151495