Re: Confidence: Chopping between 5.2 and 6.0.1

[Michael <macallan%netbsd.org@localhost>]

Hello,

On Fri, 22 Mar 2013 23:38:17 -0500
Donald Lee <MacPPC2%c.icompute.com@localhost> wrote:

> I have converged on a 99% solution for my "chop".  Here is my
> data:
> 
> 2011-04-15 - usr9 - netbsd 5.99.49 - clean - clean2 - c3 c4 c5
> 2011-04-25 - usrd - (buildfail)       netbsd 5.99.50
> 2011-05-05 - usra - netbsd 5.99.51 - clean - bad2 - bad3
> 2011-05-11 - usrc - netbsd 5.99.51b - clean - clean bad1 bad2 bad3
> 2011-05-17 - usrb - netbsd 5.99.51a - bad - bad - bad - bad
> 
> These are the checkout dates I tried, and the test results.
> 
> The 2011-04-15 version was the latest one where I saw no errors, even though
> I ran the test case (at least) 5 times.  No errors on versions prior to that
> date.
> 
> The 2011-04-25 checkout did not build, unfortunately.
> 
> The 2011-05-05 and 2011-05-11 builds looked OK, but when I re-ran the 
> tests, I did see failures.  For the 2011-05-11 version especially, it
> was hard to get an error, but I did get them.  2011-05-17 (and later)
> seems to fail freely
> 
> 
> This puts the timeframe about 3 weeks - somewhere between 2011-04-15
> and 2011-05-05, code went in to cause our badness.

There was a bunch of altivec and fpu handling related commits on May 2nd:
http://mail-index.netbsd.org/source-changes/2011/05/date1.html
Might be worth to check right before / after that.

have fun
Michael