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Date: Mon, 19 Dec 2016 18:28:42 +0100
From: Markus Trippelsdorf <markus@trippelsdorf.de>
To: linux-kernel@vger.kernel.org
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
        Ingo Molnar <mingo@redhat.com>
Subject: Re: *** buffer overflow detected ***: /usr/src/linux/tools/perf/perf
 terminated
Message-ID: <20161219172842.GB289@x4>
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 <20161219165243.GA289@x4>
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On 2016.12.19 at 17:52 +0100, Markus Trippelsdorf wrote:
> On 2016.12.19 at 17:18 +0100, Markus Trippelsdorf wrote:
> > Running the latest kernel git tree, I get buffer overflow warnings when
> > I try to run "perf top":
> > 
> > *** buffer overflow detected ***: /usr/src/linux/tools/perf/perf terminated        
> 
> It only happens when I link my kernel with gold.
> 
> (with ld.bfd)
> markus@x4 linux % readelf -n vmlinux
> 
> Displaying notes found in: .notes
>   Owner                 Data size       Description
>   GNU                  0x00000014       NT_GNU_BUILD_ID (unique build ID bitstring)
>     Build ID: 74b478c2194c0ba07481acf30f6f8781d4ffcdee
> 
> (with ld.gold)
> markus@x4 linux % readelf -n vmlinux
> 
> Displaying notes found in: .note.gnu.build-id
>   Owner                 Data size       Description
>   GNU                  0x00000014       NT_GNU_BUILD_ID (unique build ID bitstring)
>     Build ID: 017ef6e6f8ce3b44332d0baa0767526bb3a77bf8
> 
> Displaying notes found in: .note.gnu.gold-version
>   Owner                 Data size       Description
>   GNU                  0x00000009       NT_GNU_GOLD_VERSION (gold version)
>     Version: gold 1.12
> 
> And perf than chokes when parsing /sys/kernel/notes.

Started with gold commit:

 commit bfbf34de2f27672282d4fa4c0916cc41890dcc6c
 Author: Cary Coutant <ccoutant@gmail.com>
 Date:   Mon Dec 12 18:51:29 2016 -0800

    When using linker scripts, place linker-generated sections by the output section name.

I've opened a gold bug:
https://sourceware.org/bugzilla/show_bug.cgi?id=20983

-- 
Markus