[  487.677890] livepatch: kernel.ftrace_enabled = 1
[  487.724742] ===== TEST: livepatch interaction with ftrace_enabled sysctl =====
[  487.784156] livepatch: kernel.ftrace_enabled = 0
[  487.785246] % modprobe test_klp_livepatch
[  487.871325] livepatch: enabling patch 'test_klp_livepatch'
[  487.872095] livepatch: 'test_klp_livepatch': initializing patching transition
[  487.875067] livepatch: failed to register ftrace handler for function 'cmdline_proc_show' (-16)
[  487.876874] livepatch: failed to patch object 'vmlinux'
[  487.877517] livepatch: failed to enable patch 'test_klp_livepatch'
[  487.878285] livepatch: 'test_klp_livepatch': canceling patching transition, going to unpatch
[  487.878293] livepatch: 'test_klp_livepatch': completing unpatching transition
[  487.879429] livepatch: 'test_klp_livepatch': unpatching complete
[  487.893695] modprobe: ERROR: could not insert 'test_klp_livepatch': Device or resource busy
[  487.945060] livepatch: kernel.ftrace_enabled = 1
[  488.077504] % modprobe test_klp_livepatch
[  488.141761] livepatch: enabling patch 'test_klp_livepatch'
[  488.142486] livepatch: 'test_klp_livepatch': initializing patching transition
[  488.148879] livepatch: 'test_klp_livepatch': starting patching transition
[  488.151813] livepatch: 'test_klp_livepatch': completing patching transition
[  488.151933] livepatch: 'test_klp_livepatch': patching complete
[  488.317400] livepatch: sysctl: setting key "kernel.ftrace_enabled": Device or resource busy
[  488.338833] % echo 0 > /sys/kernel/livepatch/test_klp_livepatch/enabled
[  488.387852] livepatch: 'test_klp_livepatch': initializing unpatching transition
[  488.388757] livepatch: 'test_klp_livepatch': starting unpatching transition
[  488.391298] livepatch: 'test_klp_livepatch': completing unpatching transition
[  488.506136] livepatch: 'test_klp_livepatch': unpatching complete
[  488.534678] % rmmod test_klp_livepatch