linux-kernel - [PATCH 1/2 v2] perf/test: Fix perf test 84 on s390

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Message-Id: <20221216115910.369093-1-tmricht@linux.ibm.com>
Date:   Fri, 16 Dec 2022 12:59:09 +0100
From:   Thomas Richter <tmricht@...ux.ibm.com>
To:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        acme@...nel.org, gor@...ux.ibm.com, sandipan.das@....com,
        sumanthk@...ux.ibm.com
Cc:     svens@...ux.ibm.com, hca@...ux.ibm.com,
        Thomas Richter <tmricht@...ux.ibm.com>
Subject: [PATCH 1/2 v2] perf/test: Fix perf test 84 on s390

perf test '84: probe libc's inet_pton & backtrace it with ping'
fails on s390. Debugging revealed a changed stack trace for the
ping command using probes:

ping 35729 [002]  8006.365063: probe_libc:inet_pton: (3ff9603e7c0)
                  13e7c0 __GI___inet_pton+0x0 (/usr/lib64/libc.so.6)
          --->    104371 text_to_binary_address+0xef1 (inlined)
                  104371 gaih_inet+0xef1 (inlined)
                  104371 __GI_getaddrinfo+0xef1 (inlined)
                    5d4b main+0x139b (/usr/bin/ping)

The line ---> text_to_binary_address ...
is new. It was introduced with glibc version 2.36.7.2 released
with Fedora 37 for s390.

Output before
 # ./perf test 84
 84: probe libc's inet_pton & backtrace it with ping   : FAILED!
 #

Output after:
 # ./perf test 84
 84: 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 insertion(+)

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 f12a4e217968..0f01c62cbee9 100755
--- a/tools/perf/tests/shell/record+probe_libc_inet_pton.sh
+++ b/tools/perf/tests/shell/record+probe_libc_inet_pton.sh
@@ -37,6 +37,7 @@ trace_libc_inet_pton_backtrace() {
 	case "$(uname -m)" in
 	s390x)
 		eventattr='call-graph=dwarf,max-stack=4'
+		echo "text_to_binary_address.*\+0x[[:xdigit:]]+[[:space:]]\($libc|inlined\)$" >> $expected
 		echo "gaih_inet.*\+0x[[:xdigit:]]+[[:space:]]\($libc|inlined\)$" >> $expected
 		echo "(__GI_)?getaddrinfo\+0x[[:xdigit:]]+[[:space:]]\($libc|inlined\)$" >> $expected
 		echo "main\+0x[[:xdigit:]]+[[:space:]]\(.*/bin/ping.*\)$" >> $expected
-- 
2.38.1