Hi Steven, The following test fails are mostly due to this commit, or one of the last 4 commits in tree: git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git tip/perf/core head: d57c5d51a30152f3175d2344cb6395f08bf8ee0c commit: d57c5d51a30152f3175d2344cb6395f08bf8ee0c [100/100] ftrace/x86: Add support for -mfentry to x86_64 [ 9.084881] Kprobe smoke test failed: register_jprobe returned -22 [ 9.086786] Kprobe smoke test failed: register_jprobes returned -22 [ 9.121281] BUG: Kprobe smoke test: 2 out of 6 tests failed [ 9.171132] Testing tracer function: PASSED [ 9.408938] Testing dynamic ftrace: PASSED Thanks, Fengguang