Re: [Xen-devel] [linux-3.18 bisection] complete test-amd64-amd64-pair [and 1 more messages]

[Ian Jackson <ian.jackson@xxxxxxxxxx>]

Summary:

 7b8052e19304 which is a backport to linux-3.18 of be06998f96ec has
 been found by the Xen CI auto-bisector to be responsible for a
 regression booting under Xen.

Jan Beulich writes ("Re: [linux-3.18 bisection] complete 
test-amd64-amd64-pair"):
> No, I'm not. I've said what I can say in a reply to an earlier bisection
> report (from Dec 12th), attached again here for reference.

I missed that.  Thanks.

Jan Beulich writes ("Re: [Xen-devel] [linux-3.18 bisection] complete 
test-amd64-amd64-pair"):
> On 12.12.18 at 22:41, <osstest-admin@xxxxxxxxxxxxxx> wrote:
> >   Bug is in tree:  linux 
> > git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
> >   Bug introduced:  7b8052e19304865477e03a0047062d977309a22f
> >   Bug not present: d255d18a34a8d53ccc4a019dc07e17b6e8cf6bd1
> >   Last fail repro: http://logs.test-lab.xenproject.org/osstest/logs/131278/ 
> > 
> > 
> >   commit 7b8052e19304865477e03a0047062d977309a22f
> >   Author: Jan Beulich <JBeulich@xxxxxxxx>
> >   Date:   Mon Oct 19 04:23:29 2015 -0600
> >   
> >       igb: fix NULL derefs due to skipped SR-IOV enabling
> 
> _Very_ interesting. An over three years old commit was determined
> to cause whatever regression it is. But wait - that's the date of the
> mainline commit, not that of the backport (which was done a month
> ago). I notice that of the two original commits the combination of
> which the one here is supposed to fix, only one actually got
> backported. Hence I wonder whether backporting the one here
> was actually appropriate.

The mainline commit be06998f96ecb93938ad2cce46c4289bf7cf45bc from
October 2015 was backported as
7b8052e19304865477e03a0047062d977309a22f.  You need to look at the
commit date as well as the author date:

   commit 7b8052e19304865477e03a0047062d977309a22f
   Author:     Jan Beulich <JBeulich@xxxxxxxx>
   AuthorDate: Mon Oct 19 04:23:29 2015 -0600
   Commit:     Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
   CommitDate: Sat Nov 10 07:39:21 2018 -0800

CC'ing Greg K-H.

Ian.

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