linux-kernel - Re: [PATCH v2] perf test shell: Add -D to check dynamic symbols for ubuntu/debian

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Date:   Thu, 10 May 2018 09:11:32 +0800
From:   Li Zhijian <lizhijian@...fujitsu.com>
To:     Kim Phillips <kim.phillips@....com>
CC:     <linux-kernel@...r.kernel.org>, <acme@...nel.org>,
        <peterz@...radead.org>, <mingo@...hat.com>,
        <alexander.shishkin@...ux.intel.com>, <jolsa@...hat.com>,
        <namhyung@...nel.org>, <philip.li@...el.com>,
        Thomas Richter <tmricht@...ux.vnet.ibm.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH v2] perf test shell: Add -D to check dynamic symbols for
 ubuntu/debian

The input file is from
lizhijian@...well-OptiPlex-9020:~/lkp/linux/tools/perf/tests/shell$ grep libc= -A1  record+probe_libc_inet_pton.sh
libc=$(grep -w libc /proc/self/maps | head -1 | sed -r 's/.*[[:space:]](\/.*)/\1/g')
nm -gD $libc 2>/dev/null | fgrep -q inet_pton || exit 254

It mostly points to a striped libc.so(the runtime library)
lizhijian@...well-OptiPlex-9020:~/lkp/linux/tools/perf/tests/shell$ grep -w libc /proc/self/maps | head -1 | sed -r 's/.*[[:space:]](\/.*)/\1/g'
/lib/x86_64-linux-gnu/libc-2.23.so

Although we can get the expected symbol from the debug library, it still doesn't work for this case.

Thanks
Zhijian


On 05/10/2018 05:41 AM, Kim Phillips wrote:
> On Wed, 9 May 2018 15:45:29 +0800
> Li Zhijian <lizhijian@...fujitsu.com> wrote:
>
>> On Ubuntu and Debian, we can't find any symbol including "inet_pton" from 'nm -g'
>> root@...lkp-nex04-8G-5 ~# nm -g /lib/x86_64-linux-gnu/libc-2.25.so | grep inet_pton
>> nm: /lib/x86_64-linux-gnu/libc-2.25.so: no symbols
>>
>> it looks libc.so has different symbol compositions at different distros
> I'm wondering if that is because libc6-dbg isn't installed?:
>
> ubuntu$ nm -g /usr/lib/debug/lib/x86_64-linux-gnu/libc-2.26.so | grep inet_pton
> 0000000000136340 W inet_pton
> 0000000000136010 T __inet_pton_length
>
> Kim
>
>
> .
>