================
@@ -264,34 +288,35 @@ PathMappingList::FindFile(const FileSpec &orig_spec) 
const {
 
 bool PathMappingList::Replace(llvm::StringRef path, llvm::StringRef new_path,
                               bool notify) {
-  std::lock_guard<std::recursive_mutex> lock(m_mutex);
-  uint32_t idx = FindIndexForPath(path);
-  if (idx < m_pairs.size()) {
+  {
+    std::lock_guard<std::mutex> lock(m_pairs_mutex);
+    uint32_t idx = FindIndexForPath(path);
----------------
kastiglione wrote:

@JDevlieghere  It seems these two lines lead to deadlock. `FindIndexForPath` 
attempts to lock `m_pairs_mutex` too, but can't.

https://github.com/llvm/llvm-project/pull/114576
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