linux-kernel - [PATCH] Fix perf test probe libc's inet_pton on x86

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Message-Id: <20230503081255.3372986-1-tmricht@linux.ibm.com>
Date:   Wed,  3 May 2023 10:12:55 +0200
From:   Thomas Richter <tmricht@...ux.ibm.com>
To:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        acme@...nel.org
Cc:     svens@...ux.ibm.com, gor@...ux.ibm.com, sumanthk@...ux.ibm.com,
        hca@...ux.ibm.com, Thomas Richter <tmricht@...ux.ibm.com>
Subject: [PATCH] Fix perf test probe libc's inet_pton on x86_64

The test case probe libc's inet_pton & backtrace it with ping
fails with Fedora 38 on x86_64.

Function getaddrinfo() does not show up in the call chain anymore:
 # ./perf script
 ping  1803 [000] 728.567146: probe_libc:inet_pton: (7f5275afc840)
           133840 __GI___inet_pton+0x0 (/usr/lib64/libc.so.6)
            27b4a __libc_start_call_main+0x7a (/usr/lib64/libc.so.6)
            27c0b __libc_start_main@@GLIBC_2.34+0x8b (/usr/lib64/libc.so.6)

 ping  1803 [000]   728.567184: probe_libc:inet_pton: (7f5275afc840)
           133840 __GI___inet_pton+0x0 (/usr/lib64/libc.so.6)
             493e main+0xcde (/usr/bin/ping)
            27b4a __libc_start_call_main+0x7a (/usr/lib64/libc.so.6)

 #
which causes the test case to fail. Remove function getaddrinfo()
from list of expected functions.

Output before:
 # ./perf test 'libc'
 91: probe libc's inet_pton & backtrace it with ping    : FAILED!
 #

Output after:
 # ./perf test 'libc'
 91: probe libc's inet_pton & backtrace it with ping    : Ok
 #

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 b4149b2db4c6..8d5915d3ad6f 100755
--- a/tools/perf/tests/shell/record+probe_libc_inet_pton.sh
+++ b/tools/perf/tests/shell/record+probe_libc_inet_pton.sh
@@ -51,7 +51,6 @@ 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
-- 
2.40.1