The simplest way to answer this is if you can help us construct a program, whether as Haskell or cmm, which tickles the failure you suspect is there ? 

The rts definitely gets less love overall.  And there’s fewer folks involved in those layers overall.  

On Wed, Feb 26, 2020 at 10:03 AM Shao, Cheng <cheng.shao@tweag.io> wrote:

Hi all,

When an MVar# primop blocks, it jumps to a function in
HeapStackCheck.cmm which pushes a RET_SMALL stack frame before
returning to the scheduler (e.g. the takeMVar# primop jumps to
stg_block_takemvar for stack adjustment). But these functions directly
bump Sp without checking for possible stack overflow, I wonder if it
is a bug?

Cheers,
Cheng
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