[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);
>  }
> ```

Then we will break libdl_deadlock.cpp :(
We can split Threads and Allocator lock, but the may get into the same issue later.

Lets keep as is for now.


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