Fedora 33 and perf probe failures

From: Thomas Richter <tmricht@linux.ibm.com>
To: "linux-perf-use." <linux-perf-users@vger.kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
	Sumanth Korikkar <sumanthk@linux.ibm.com>,
	Masami Hiramatsu <mhiramat@kernel.org>
Subject: Fedora 33 and perf probe failures
Date: Wed, 18 Nov 2020 17:37:21 +0100	[thread overview]
Message-ID: <63cdd43f-c970-6c7e-b322-a41f6d418cf7@linux.ibm.com> (raw)

I debugged the failure of some perf test cases on Fedora 33. The following
test cases fail on s390 and x86_64 using

[root@f33 yum.repos.d]# uname -a
Linux f33 5.9.8-200.fc33.x86_64 #1 SMP Tue Nov 10 21:58:19 UTC 2020
                                x86_64 x86_64 x86_64 GNU/Linux
[root@f33 yum.repos.d]#

[root@f33 yum.repos.d]# perf test -F 74 77 78
74: Use vfs_getname probe to get syscall args filenames
                :Failed to write event: Invalid argument
Error: Failed to add events.
FAILED!
77: Check open filename arg using perf trace + vfs_getname
                :Failed to write event: Invalid argument
Error: Failed to add events.
FAILED!
78: Add vfs_getname probe to get syscall args filenames
                :Failed to write event: Invalid argument
Error: Failed to add events.
FAILED!
[root@f33 yum.repos.d]#

The root cause is the output of perf probe -L which returns:
[root@f33 yum.repos.d]# perf probe -L getname_flags
Specified source line is not found.
Error: Failed to show lines.
[root@f33 yum.repos.d]#

whereas on my Fedora 32 installation this command shows
[root@t35lp46 perf]# cat /etc/redhat-release
Fedora release 32 (Thirty Two)
[root@t35lp46 perf]#

[root@t35lp46 perf]# ./perf probe -L getname_flags | tail -10
     68                         return ERR_PTR(-ENOENT);
                        }
                }

     72         result->uptr = filename;
     73         result->aname = NULL;
     74         audit_getname(result);
                return result;
}

[root@t35lp46 perf]#

Any ideas how to fix this? Is this failure related to a missing debuginfod
setup, even when I have installed the debuginfo packages for the kernel:

[root@f33 ~]# perf probe -L getname_flags
Specified source line is not found.
  Error: Failed to show lines.
[root@f33 ~]# uname -a
Linux f33 5.9.8-200.fc33.x86_64 #1 SMP Tue Nov 10 21:58:19 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
[root@f33 ~]# rpm -qa | fgrep kernel | fgrep debuginfo
kernel-debuginfo-common-x86_64-5.9.8-200.fc33.x86_64
kernel-debuginfo-5.9.8-200.fc33.x86_64
kernel-tools-debuginfo-5.9.7-200.fc33.x86_64
[root@f33 ~]#
~                          

Thanks a lot
-- 
Thomas Richter, Dept 3252, IBM s390 Linux Development, Boeblingen, Germany
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