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Re: Odd build breakage in 4.9-rc7

From Prarit Bhargava <prarit@redhat.com>
Newsgroups linux.kernel
Subject Re: Odd build breakage in 4.9-rc7
Date 2016-12-01 13:50 +0100
Message-ID <sJyYi-3Vi-17@gated-at.bofh.it> (permalink)
References (2 earlier) <sJhNL-1aw-5@gated-at.bofh.it> <sJhXs-1dw-25@gated-at.bofh.it> <sJigO-1kn-17@gated-at.bofh.it> <sJiTy-1Nf-89@gated-at.bofh.it> <sJlRo-3GR-13@gated-at.bofh.it>
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On 11/30/2016 05:41 PM, Nicolas Pitre wrote:
> On Wed, 30 Nov 2016, Linus Torvalds wrote:
> 
>> On Wed, Nov 30, 2016 at 10:50 AM, Prarit Bhargava <prarit@redhat.com> wrote:
>>>
>>> It comes back.  The steps to reproduce this are:
>>>
>>> 1.  checkout latest linux.git
>>> 2.  make -j112
>>>
>>> (IOW, it occurs 100% of the time for me on a clean tree.)
> 
> I don't have access to such hardware where -j112 could ever make sense.  :-)

:)  I could push the builds onto the -j256 but I'm doing other stuff over there. :)

> In other words, I can't reproduce regardless of the -j value I try.
> 
>> I suspect it's not new, it's just that you are able to hit the timing
>> just right (and the new include presumable makes that just be much
>> easier).
> 
> Here's the best fix I can think of. I can't convince myself any other 
> location would be 100% safe.  Obviously I can't confirm if this actually 
> fixes anything.
> 
> ----- >8
> Subject: kbuild: make sure autoksyms.h exists early
> 

I'm building with this patch on top of latest now.  I will put it in a tight
loop and clear the drop_caches between builds to see if I can make it fail.

Thanks Nicolas -- your help is very much appreciated.

P.

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Thread

Odd build breakage in 4.9-rc7 Jarod Wilson <jarod@redhat.com> - 2016-11-30 18:30 +0100
  Re: Odd build breakage in 4.9-rc7 Linus Torvalds <torvalds@linux-foundation.org> - 2016-11-30 19:20 +0100
    Re: Odd build breakage in 4.9-rc7 Prarit Bhargava <prarit@redhat.com> - 2016-11-30 19:30 +0100
      Re: Odd build breakage in 4.9-rc7 Linus Torvalds <torvalds@linux-foundation.org> - 2016-11-30 19:40 +0100
        Re: Odd build breakage in 4.9-rc7 Prarit Bhargava <prarit@redhat.com> - 2016-11-30 20:00 +0100
          Re: Odd build breakage in 4.9-rc7 Jarod Wilson <jarod@redhat.com> - 2016-11-30 20:10 +0100
          Re: Odd build breakage in 4.9-rc7 Linus Torvalds <torvalds@linux-foundation.org> - 2016-11-30 20:40 +0100
            Re: Odd build breakage in 4.9-rc7 Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-11-30 23:50 +0100
              Re: Odd build breakage in 4.9-rc7 Prarit Bhargava <prarit@redhat.com> - 2016-12-01 13:50 +0100
              Re: Odd build breakage in 4.9-rc7 Prarit Bhargava <prarit@redhat.com> - 2016-12-01 15:20 +0100
                Re: Odd build breakage in 4.9-rc7 Jarod Wilson <jarod@redhat.com> - 2016-12-01 16:30 +0100
          Re: Odd build breakage in 4.9-rc7 Nicolas Pitre <nico@fluxnic.net> - 2016-12-01 00:20 +0100
  Re: Odd build breakage in 4.9-rc7 Paul Bolle <pebolle@tiscali.nl> - 2016-11-30 22:00 +0100
    Re: Odd build breakage in 4.9-rc7 Jarod Wilson <jarod@redhat.com> - 2016-11-30 22:10 +0100
      Re: Odd build breakage in 4.9-rc7 Jarod Wilson <jarod@redhat.com> - 2016-11-30 22:40 +0100
        Re: Odd build breakage in 4.9-rc7 Paul Bolle <pebolle@tiscali.nl> - 2016-11-30 22:50 +0100
          Re: Odd build breakage in 4.9-rc7 Paul Bolle <pebolle@tiscali.nl> - 2016-11-30 23:00 +0100
            Re: Odd build breakage in 4.9-rc7 Jarod Wilson <jarod@redhat.com> - 2016-12-01 00:50 +0100
              Re: Odd build breakage in 4.9-rc7 Paul Bolle <pebolle@tiscali.nl> - 2016-12-01 10:10 +0100
                Re: Odd build breakage in 4.9-rc7 Paul Bolle <pebolle@tiscali.nl> - 2016-12-01 14:50 +0100
                Re: Odd build breakage in 4.9-rc7 Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-12-01 18:50 +0100
                Re: Odd build breakage in 4.9-rc7 Paul Bolle <pebolle@tiscali.nl> - 2016-12-01 21:20 +0100
                Re: Odd build breakage in 4.9-rc7 Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-12-02 21:20 +0100
                Re: Odd build breakage in 4.9-rc7 Jarod Wilson <jarod@redhat.com> - 2016-12-02 23:50 +0100

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