libsanitizer: Initialize local_head member [PR126307]

The following patch cherry picks an upstream fix for this.

2026-07-20  Jakub Jelinek  <jakub@redhat.com>

	PR sanitizer/126307
	* tsan/tsan_trace.h: Cherry-pick llvm-project revision
	cdfdb06c9155080ec97d6e4f4dd90b6e7cefb0ca.

diff --git a/libsanitizer/tsan/tsan_trace.h b/libsanitizer/tsan/tsan_trace.h
index 01bb7b34f43a2c5b6e3f1ee93a44db51033bf739..1e791ff765fec554c69b3258e2dc65c5a87f16c8 100644 (file)
--- a/libsanitizer/tsan/tsan_trace.h
+++ b/libsanitizer/tsan/tsan_trace.h
@@ -190,7 +190,7 @@ struct Trace {
   Mutex mtx;
   IList<TraceHeader, &TraceHeader::trace_parts, TracePart> parts;
   // First node non-queued into ctx->trace_part_recycle.
-  TracePart* local_head;
+  TracePart* local_head = nullptr;
   // Final position in the last part for finished threads.
   Event* final_pos = nullptr;
   // Number of trace parts allocated on behalf of this trace specifically.