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From: Joe Lawrence <joe.lawrence@redhat.com>
To: Miroslav Benes <mbenes@suse.cz>, Petr Mladek <pmladek@suse.com>
Cc: linux-kernel@vger.kernel.org, live-patching@vger.kernel.org,
	linux-kbuild@vger.kernel.org
Subject: Re: [PATCH v4 00/10] klp-convert livepatch build tooling
Date: Tue, 25 Jun 2019 09:24:20 -0400
Message-ID: <76da6ab0-5540-d9ff-c5ea-6dc31a39c744@redhat.com> (raw)
In-Reply-To: <alpine.LSU.2.21.1906251324450.12085@pobox.suse.cz>

On 6/25/19 7:36 AM, Miroslav Benes wrote:
> 
 > [ ... snip ... ]
 >
> So I made a couple of experiments and found that GCC is somehow involved.
> If klp-convert (from scripts/livepatch/) is compiled with our GCC 4.8.5
> from SLE12, the output is incorrect. If I compile it with GCC 7.4.0 from
> openSUSE Leap 15.1, the output is correct.
> 
> If I revert commit d59cadc0a8f8 ("[squash] klp-convert: make
> convert_rela() list-safe") (from Joe's expanded github tree), the problem
> disappears.
> 
> I haven't spotted any problem in the code and I cannot explain a
> dependency on GCC version. Any ideas?
> 

Thanks for revisiting and debugging this.  Narrowing it down to my "fix" 
to convert_rela() should be helpful.

In my case, I was probably testing with RHEL-8, which has gcc 8.2 vs 
RHEL-7 which has gcc 4.8.  I'll have to make sure to try with a few 
different versions for the next round.

-- Joe

  reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20190509143859.9050-1-joe.lawrence@redhat.com>
     [not found] ` <alpine.LSU.2.21.1906131451560.22698@pobox.suse.cz>
     [not found]   ` <b1a627a4-3702-9689-6c03-0c2123c06a2d@redhat.com>
     [not found]     ` <c9021573-11c6-b576-0aa6-97754c98a06e@redhat.com>
     [not found]       ` <20190614083435.uq3mk6mprbatysol@pathway.suse.cz>
2019-06-25 11:36         ` Miroslav Benes
2019-06-25 13:24           ` Joe Lawrence [this message]
2019-06-25 19:08           ` Joe Lawrence
2019-06-26 10:27             ` Miroslav Benes
     [not found] ` <20190509143859.9050-4-joe.lawrence@redhat.com>
2019-07-31  2:50   ` [PATCH v4 03/10] livepatch: Add klp-convert tool Masahiro Yamada
2019-07-31  3:36     ` Masahiro Yamada
2019-08-09 18:42       ` Joe Lawrence
2019-08-13  1:15         ` Masahiro Yamada
     [not found] ` <20190509143859.9050-7-joe.lawrence@redhat.com>
2019-07-31  5:58   ` [PATCH v4 06/10] modpost: Add modinfo flag to livepatch modules Masahiro Yamada
2019-08-12 15:56     ` Joe Lawrence
2019-08-15 15:05       ` Masahiro Yamada
2019-08-16  8:19         ` Miroslav Benes
2019-08-16 12:43           ` Joe Lawrence
2019-08-16 19:01             ` Joe Lawrence
2019-08-19  3:50               ` Masahiro Yamada
2019-08-19 15:55                 ` Joe Lawrence
2019-08-20  7:54                   ` Miroslav Benes
2019-08-19  3:49             ` Masahiro Yamada
2019-08-19  7:31               ` Miroslav Benes
2019-08-19 16:02                 ` Joe Lawrence
2019-08-22  3:35                   ` Masahiro Yamada
2019-08-13 10:26     ` Miroslav Benes
     [not found] ` <20190509143859.9050-8-joe.lawrence@redhat.com>
2019-08-16 11:35   ` [PATCH v4 07/10] livepatch: Add sample livepatch module Masahiro Yamada
2019-08-16 12:47     ` Joe Lawrence

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