yxsamliu wrote:

I opened #206738 to fix this.

The test still had one extra 8-byte word in the hand-written raw profile. After 
#190708, that shifts the name section, so the reader sees the wrong name size 
and MSan catches the over-read.

The fix removes that extra word. I also ran `llvm/test/tools/llvm-profdata`; it 
passed locally.

https://github.com/llvm/llvm-project/pull/190708
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