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-rw-r--r--lib/tsan/rtl/tsan_mman.cc17
1 files changed, 17 insertions, 0 deletions
diff --git a/lib/tsan/rtl/tsan_mman.cc b/lib/tsan/rtl/tsan_mman.cc
index ebb3f77fb992..12a616ff5ae8 100644
--- a/lib/tsan/rtl/tsan_mman.cc
+++ b/lib/tsan/rtl/tsan_mman.cc
@@ -36,6 +36,23 @@ struct MapUnmapCallback {
// We are about to unmap a chunk of user memory.
// Mark the corresponding shadow memory as not needed.
DontNeedShadowFor(p, size);
+ // Mark the corresponding meta shadow memory as not needed.
+ // Note the block does not contain any meta info at this point
+ // (this happens after free).
+ const uptr kMetaRatio = kMetaShadowCell / kMetaShadowSize;
+ const uptr kPageSize = GetPageSizeCached() * kMetaRatio;
+ // Block came from LargeMmapAllocator, so must be large.
+ // We rely on this in the calculations below.
+ CHECK_GE(size, 2 * kPageSize);
+ uptr diff = RoundUp(p, kPageSize) - p;
+ if (diff != 0) {
+ p += diff;
+ size -= diff;
+ }
+ diff = p + size - RoundDown(p + size, kPageSize);
+ if (diff != 0)
+ size -= diff;
+ FlushUnneededShadowMemory((uptr)MemToMeta(p), size / kMetaRatio);
}
};