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

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Date:   Fri, 29 Jun 2018 12:17:36 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Li Zhijian <lizhijian@...fujitsu.com>
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

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.

- 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