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

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Date:   Tue, 13 Dec 2022 11:37:08 +0100
From:   Thomas Richter <tmricht@...ux.ibm.com>
To:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        acme@...nel.org, hca@...ux.ibm.com, gor@...ux.ibm.com,
        sumanthk@...ux.ibm.com
Cc:     svens@...ux.ibm.com, Thomas Richter <richter@...ibm.com>
Subject: [PATCH 2/2] perf/test: Fix perf test 89 on x86

From: Thomas Richter <richter@...ibm.com>

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
 #

Signed-off-by: Thomas Richter <richter@...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