ilovepi wrote:

> > https://lab.llvm.org/buildbot/#/builders/164/builds/20521 the msan bot 
> > seems good now, but darwin still seems unhappy 
> > https://lab.llvm.org/buildbot/#/builders/23/builds/19172. I have one more 
> > PR I think could solve this, and if not, I'll have to revert the stack.
> 
> Which PR is this? I can take the bot offline and give it a try. 
> Alternatively, is there anything I can easily do that might help to debug the 
> issue?

The pr is in https://github.com/llvm/llvm-project/pull/191644

I have a revert up also in #191668, which is sad since it was quite the 
undertaking to get that part of the stack landed.

As far as debugging ... IDK. I can't repro on an M4 macbook, so this seems 
either specific to that builder or to x86 darwin.  Its frustrating since the 
msan bot is green now, so I'm not too sure what I can do other than back it all 
out. 

Likely there is something subtle going on with the memory management and I'm 
missing it someplace.

https://github.com/llvm/llvm-project/pull/190054
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