[compiler-rt] [ASan] Prevent ASan/LSan deadlock by preloading modules before error reporting (PR #131756)

[Vitaly Buka via llvm-commits]

vitalybuka wrote:

> ### Proposed Fixes for ASan-LSan Deadlock Issue

@Camsyn Will this work?
```
--- a/compiler-rt/lib/lsan/lsan_common_linux.cpp
+++ b/compiler-rt/lib/lsan/lsan_common_linux.cpp
@@ -117,7 +117,6 @@ void HandleLeaks() {
 
 static int LockStuffAndStopTheWorldCallback(struct dl_phdr_info *info,
                                             size_t size, void *data) {
-  ScopedStopTheWorldLock lock;
   DoStopTheWorldParam *param = reinterpret_cast<DoStopTheWorldParam *>(data);
   StopTheWorld(param->callback, param->argument);
   return 1;
@@ -133,6 +132,7 @@ static int LockStuffAndStopTheWorldCallback(struct dl_phdr_info *info,
 // callback in the parent thread.
 void LockStuffAndStopTheWorld(StopTheWorldCallback callback,
                               CheckForLeaksParam *argument) {
+  ScopedStopTheWorldLock lock;
   DoStopTheWorldParam param = {callback, argument};
   dl_iterate_phdr(LockStuffAndStopTheWorldCallback, &param);
 }
```

https://github.com/llvm/llvm-project/pull/131756