linux-kernel - Re: [PATCH] perf test record+probe_libc_inet_pton: expect [unknown] for ping as well

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Date:   Sun, 1 Jul 2018 13:40:06 +0800
From:   Li Zhijian <lizhijian@...fujitsu.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
CC:     <peterz@...radead.org>, <mingo@...hat.com>,
        <alexander.shishkin@...ux.intel.com>, <jolsa@...hat.com>,
        <namhyung@...nel.org>, <linux-kernel@...r.kernel.org>,
        Sandipan Das <sandipan@...ux.vnet.ibm.com>,
        Thomas Richter <tmricht@...ux.ibm.com>
Subject: Re: [PATCH] perf test record+probe_libc_inet_pton: expect [unknown]
 for ping as well


On 06/29/2018 11:17 PM, Arnaldo Carvalho de Melo wrote:
> Em Thu, Jun 28, 2018 at 03:16:00PM +0800, Li Zhijian escreveu:
>> On system which has not installed debuginfo of iputils(ping) will fail like:
>> ~/lkp/linux/tools/perf$ sudo ./perf test ping -v
> I think that we should try to check if the required debuginfo package is
> installed and if so, expect the symbol resolution that takes place in
> that case. Other wise expect [unknown], this way we don't leave this
> test accepting almost anything in any case.

Looks ping binary in different distros include different symbol.
without this patch, ubuntu 16.04 is good and debian 9 is bad when they both have not installed debuginfo for ping.

and then after i installed debuginfo for ping(iputils-ping-dbgsym), test become passed as well on debian 9

Debian 9
bofore installing debuginfo, it includes [unknown]
root@...lkp-nex04-8G-10 /usr/src/linux-perf-x86_64-randconfig-w0-06061439-fb43d6cb91ef57d9e58d5f69b423784ff4a4c374/tools/perf# ./perf test ping -v
62: probe libc's inet_pton & backtrace it with ping       :
--- start ---
test child forked, pid 6324
ping 6341 [000] 4470.361330: probe_libc:inet_pton: (7f9f3900eaa0)
105aa0 inet_pton (/lib/x86_64-linux-gnu/libc-2.24.so)
d52f8 getaddrinfo (/lib/x86_64-linux-gnu/libc-2.24.so)
3ebe [unknown] (/bin/ping)
test child finished with 0

------------------------------
after install debuginfo
root@...lkp-nex04-8G-10 /usr/src/linux-perf-x86_64-randconfig-w0-06061439-fb43d6cb91ef57d9e58d5f69b423784ff4a4c374/tools/perf# ./perf test ping -v
62: probe libc's inet_pton & backtrace it with ping       :
--- start ---
test child forked, pid 6387
ping 6404 [000] 4488.855086: probe_libc:inet_pton: (7fb5bcc7caa0)
105aa0 inet_pton (/lib/x86_64-linux-gnu/libc-2.24.so)
d52f8 getaddrinfo (/lib/x86_64-linux-gnu/libc-2.24.so)
3ebe main (/bin/ping)
test child finished with 0



Thanks


>
> - Arnaldo
>
>> 63: probe libc's inet_pton & backtrace it with ping       :
>> --- start ---
>> test child forked, pid 4207
>> ping 4224 [007] 3034121.295510: probe_libc:inet_pton: (7fedfccb2200)
>> 7fedfccb2200 __GI___inet_pton+0x0 (/lib/x86_64-linux-gnu/libc-2.23.so)
>> 7fedfcc7ad5e getaddrinfo+0xee (/lib/x86_64-linux-gnu/libc-2.23.so)
>> 55e3239a9f4d [unknown] (/bin/ping)
>> FAIL: expected backtrace entry 3
>> ".*\+0x[[:xdigit:]]+[[:space:]]\(.*/bin/ping.*\)$" got "55e3239a9f4d [unknown] (/bin/ping)"
>> test child finished with -1
>> ---- end ----
>> probe libc's inet_pton & backtrace it with ping: FAILED!
>>
>> To be compatible with this system, expects [unknown] as well
>>
>> Fixes: 7903a7086723 ("perf script: Show symbol offsets by default")
>> CC: Sandipan Das <sandipan@...ux.vnet.ibm.com>
>> CC: Thomas Richter <tmricht@...ux.ibm.com>
>> Reported-by: kernel test robot <xiaolong.ye@...el.com>
>> Signed-off-by: Li Zhijian <lizhijian@...fujitsu.com>
>> ---
>>   tools/perf/tests/shell/record+probe_libc_inet_pton.sh | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/tools/perf/tests/shell/record+probe_libc_inet_pton.sh b/tools/perf/tests/shell/record+probe_libc_inet_pton.sh
>> index 2630570..ebb6549 100755
>> --- a/tools/perf/tests/shell/record+probe_libc_inet_pton.sh
>> +++ b/tools/perf/tests/shell/record+probe_libc_inet_pton.sh
>> @@ -22,12 +22,12 @@ trace_libc_inet_pton_backtrace() {
>>   		eventattr='call-graph=dwarf,max-stack=4'
>>   		expected[2]="gaih_inet.*\+0x[[:xdigit:]]+[[:space:]]\($libc|inlined\)$"
>>   		expected[3]="(__GI_)?getaddrinfo\+0x[[:xdigit:]]+[[:space:]]\($libc|inlined\)$"
>> -		expected[4]="main\+0x[[:xdigit:]]+[[:space:]]\(.*/bin/ping.*\)$"
>> +		expected[4]=".*(\+0x[[:xdigit:]]|\[unknown\])+[[:space:]]\(.*/bin/ping.*\)$"
>>   		;;
>>   	*)
>>   		eventattr='max-stack=3'
>>   		expected[2]="getaddrinfo\+0x[[:xdigit:]]+[[:space:]]\($libc\)$"
>> -		expected[3]=".*\+0x[[:xdigit:]]+[[:space:]]\(.*/bin/ping.*\)$"
>> +		expected[3]=".*(\+0x[[:xdigit:]]|\[unknown\])+[[:space:]]\(.*/bin/ping.*\)$"
>>   		;;
>>   	esac
>>   
>> -- 
>> 2.7.4
>
> .
>

-- 
Best regards.
Li Zhijian (8528)