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Date: Thu, 5 Sep 2013 15:33:10 +0200
Message-ID: <CAFrcx1koLAnNRBtpAhOoTP0SC-wWknY7ipUmcvnjxKqwDOUmag@mail.gmail.com>
Subject: Re: [PATCH 3/3] perf: parse the .debug_frame section in case
 .eh_frame is not present
From: Jean Pihet <jean.pihet@linaro.org>
To: Will Deacon <will.deacon@arm.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>,
        Jean Pihet <jean.pihet@newoldbits.com>,
        "linaro-kernel@lists.linaro.org" <linaro-kernel@lists.linaro.org>,
        "patches@linaro.org" <patches@linaro.org>,
        Michael Hudson-Doyle <michael.hudson@linaro.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Jiri Olsa <jolsa@redhat.com>,
        "linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>
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On 5 September 2013 15:19, Will Deacon <will.deacon@arm.com> wrote:
> On Thu, Sep 05, 2013 at 02:17:30PM +0100, Ard Biesheuvel wrote:
>> On 5 September 2013 15:05, Jean Pihet <jean.pihet@newoldbits.com> wrote:
>> [..]
>> > Here are the commands I have been using:
>> >  perf record -g dwarf -- <binary to profile>
>> >  perf report --sort symbol --call-graph --stdio
>> >
>>
>> Ah, I failed to add the 'dwarf' after -g, however, in that case, my
>> perf report segfaults:
>
> Same SEGV here.
Ouch! I never got the segfault on my side.

Here is the setup I am using:
- OMAP4 Pandaboard,
- 13.07 Ubuntu dist from http://www.linaro.org/downloads/,
- 3.11 mainline kernel + 3 patches for unwinding info,
- patched perf tool,
- dbg flavor of the libs installed. Without them installed I do not
get the address resolved but no segfaults

Can you check if the linked libraries contain the .debug_frame
sections? (ldd; readelf -S /lib/arm-linux-gnueabihf/libc-2.17.so|grep
debug_frame; readelf -S
/usr/lib/debug/lib/arm-linux-gnueabihf/libc-2.17.so|grep debug_frame)?

>
> Will

Jean
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