[  131.003203] livepatch: kernel.ftrace_enabled = 1
[  131.008255] ===== TEST: livepatch interaction with ftrace_enabled sysctl =====
[  131.013638] livepatch: kernel.ftrace_enabled = 0
[  131.014846] % modprobe test_klp_livepatch
[  131.038724] livepatch: enabling patch 'test_klp_livepatch'
[  131.039988] livepatch: 'test_klp_livepatch': initializing patching transition
[  131.040057] livepatch: failed to register ftrace handler for function 'cmdline_proc_show' (-16)
[  131.042112] livepatch: failed to patch object 'vmlinux'
[  131.043280] livepatch: failed to enable patch 'test_klp_livepatch'
[  131.044649] livepatch: 'test_klp_livepatch': canceling patching transition, going to unpatch
[  131.044651] livepatch: 'test_klp_livepatch': completing unpatching transition
[  131.044756] livepatch: 'test_klp_livepatch': unpatching complete
[  131.061234] modprobe: ERROR: could not insert 'test_klp_livepatch': Device or resource busy
[  131.067031] livepatch: kernel.ftrace_enabled = 1
[  131.076310] % modprobe test_klp_livepatch
[  131.099521] livepatch: enabling patch 'test_klp_livepatch'
[  131.100774] livepatch: 'test_klp_livepatch': initializing patching transition
[  131.104068] livepatch: 'test_klp_livepatch': starting patching transition
[  132.494380] livepatch: 'test_klp_livepatch': completing patching transition
[  132.494499] livepatch: 'test_klp_livepatch': patching complete
[  132.569909] livepatch: sysctl: setting key "kernel.ftrace_enabled": Device or resource busy
[  132.571782] kernel.ftrace_enabled = 1
[  132.574967] % echo 0 > /sys/kernel/livepatch/test_klp_livepatch/enabled
[  132.576905] livepatch: 'test_klp_livepatch': initializing unpatching transition
[  132.576951] livepatch: 'test_klp_livepatch': starting unpatching transition
[  132.578938] livepatch: 'test_klp_livepatch': completing unpatching transition
[  132.601398] livepatch: 'test_klp_livepatch': unpatching complete
[  132.605141] % rmmod test_klp_livepatch