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Thanks Xiaojing,

commit e1f1414bcf672be16809cc3deb01789575b8772c (origin/s390x_ttysclp0, s390x_ttysclp0)
Author: rfan1 richard.fan@suse.com
Date: Mon Feb 7 03:40:12 2022 -0500

Make sure non-root user can access serialdev

diff --git a/lib/utils.pm b/lib/utils.pm
index b185e8e1d..05ac37b00 100644
--- a/lib/utils.pm
+++ b/lib/utils.pm
@@ -1259,7 +1259,8 @@ sub ensure_serialdev_permissions {
     else {
         # when serial getty is started, it changes the group of serialdev from dialout to tty (but doesn't change it back when stopped)
         # let's make sure that both will work
-        assert_script_run "chown $testapi::username /dev/$testapi::serialdev && usermod -a -G tty,dialout,\$(stat -c %G /dev/$testapi::serialdev) $testapi::username";
+        # based on bsc#1195620, let's restore file permission to '620'
+        assert_script_run "chmod 620 /dev/$testapi::serialdev && chown $testapi::username /dev/$testapi::serialdev && usermod -a -G tty,dialout,\$(stat -c %G /dev/$testapi::serialdev) $testapi::username";
     }
 }

I can revert this change.

Let me do some test with my own branch at first

https://github.com/os-autoinst/os-autoinst-distri-opensuse/pull/14456