On 22.12.2017 17:58, Robert Elz wrote:
>     Date:        Fri, 22 Dec 2017 23:35:12 +0700
>     From:        Robert Elz <k...@munnari.oz.au>
>     Message-ID:  <19521.1513960...@andromeda.noi.kre.to>
> 
>   | The EFAULT that is returned there is probably the one Kamil mentioned.
> 
> And of course it is, as in the test ...
> 
>       if ((p != curproc && (p->p_sflag & PS_WEXIT) != 0) ||
> 
> (the || alternative is irrelevant, even though it is XXX'd) as
> we know p != curproc (this is ptrace I/O - the process whose addr
> space is being written is not the process doing the sys call
> "What never?   Well, hardly ever...")  and nor is that process usually
> exiting (too late to modify it then) - so for ptrace() that test
> is more or less guaranteed true - which leads to the EFAULT.
> 
> kre
> 

Thank you for the investigation!

I'm cleaning up now the status of the existing tests and be back to to
proper fix for PT_READ/WRITE_I/D.

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