hctim added a comment.

In D127812#4009447 <https://reviews.llvm.org/D127812#4009447>, @hctim wrote:

> Hi, this looks like a candidate for breaking the MSan bot: 
> https://lab.llvm.org/buildbot/#/builders/5/builds/30139
>
> Still looking into it and bisecting, will let you know when I have more info. 
> To reproduce the bots, the best way (because MSan setup is tricky because it 
> requires an instrumented libcxx) is to use the scripts from 
> https://github.com/google/sanitizers/wiki/SanitizerBotReproduceBuild 
> (buildbot_fast.sh is the right one).

Yeah, unfortunately I did track this failure down to this commit and reverted 
it upstream. If you need help figuring it out, please let me know. You may find 
that adding `-fsanitize-memory-track-origins=2` useful to add to the 
buildscript as well (which can be done by changing `check_stage2_msan` to 
`check_stage2_msan_track_origins` in `buildbot_fast.sh`.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D127812/new/

https://reviews.llvm.org/D127812

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