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-rw-r--r--compiler-rt/lib/tsan/rtl/tsan_sync.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler-rt/lib/tsan/rtl/tsan_sync.cc b/compiler-rt/lib/tsan/rtl/tsan_sync.cc
index 44c6a26a1e8..2be047462fc 100644
--- a/compiler-rt/lib/tsan/rtl/tsan_sync.cc
+++ b/compiler-rt/lib/tsan/rtl/tsan_sync.cc
@@ -64,6 +64,7 @@ void MetaMap::AllocBlock(ThreadState *thr, uptr pc, uptr p, uptr sz) {
u32 idx = block_alloc_.Alloc(&thr->proc()->block_cache);
MBlock *b = block_alloc_.Map(idx);
b->siz = sz;
+ b->tag = 0;
b->tid = thr->tid;
b->stk = CurrentStackId(thr, pc);
u32 *meta = MemToMeta(p);
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