Blocking MVar# primops not performing stack checks?

[Carter Schonwald]

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 at 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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