linux-kernel - Re: [PATCH 2/2] perf/test: Fix perf test 89 on x86

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Date:   Tue, 13 Dec 2022 11:46:52 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Thomas Richter <tmricht@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        hca@...ux.ibm.com, gor@...ux.ibm.com, sumanthk@...ux.ibm.com,
        svens@...ux.ibm.com
Subject: Re: [PATCH 2/2] perf/test: Fix perf test 89 on x86

Em Tue, Dec 13, 2022 at 11:57:29AM +0100, Thomas Richter escreveu:
> perf test '89: probe libc's inet_pton & backtrace it with ping'
> fails on x86. Debugging revealed a changed stack trace for the
> ping command using probes:
> 
> ping 35729 [002]  8006.365063: probe_libc:inet_pton: (3ff9603e7c0)
>                   12be50 __GI___inet_pton+0x0 (/usr/lib64/libc.so.6)
>                   4fca main+0x139b (/usr/bin/ping)
> 
> The line getaddrinfo.... in the call stack is gone.
> It was introduced with glibc version 2.36.8 released
> with Fedora 37.
> 
> Output before on x86
>  # ./perf test 89
>  89: probe libc's inet_pton & backtrace it with ping   : FAILED!
>  #
> 
> Output after on x86:
>  # ./perf test 89
>  89: probe libc's inet_pton & backtrace it with ping   : Ok
>  #

Not having at the current state of that script, that $expected may be a
subset of the actual backtrace, i.e. will this continue working with
the systems where that getaddrinfo line appear?

- Arnaldo
 
> Signed-off-by: Thomas Richter <tmricht@...ux.ibm.com>
> ---
>  tools/perf/tests/shell/record+probe_libc_inet_pton.sh | 1 -
>  1 file changed, 1 deletion(-)
> 
> 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 0f01c62cbee9..51ae8b906055 100755
> --- a/tools/perf/tests/shell/record+probe_libc_inet_pton.sh
> +++ b/tools/perf/tests/shell/record+probe_libc_inet_pton.sh
> @@ -50,7 +50,6 @@ trace_libc_inet_pton_backtrace() {
>  		;;
>  	*)
>  		eventattr='max-stack=3'
> -		echo "getaddrinfo\+0x[[:xdigit:]]+[[:space:]]\($libc\)$" >> $expected
>  		echo ".*(\+0x[[:xdigit:]]+|\[unknown\])[[:space:]]\(.*/bin/ping.*\)$" >> $expected
>  		;;
>  	esac
> -- 
> 2.38.1

-- 

- Arnaldo