FYI, we noticed the following commit (built with gcc-7): commit: ecadccb31b8f1516dd045cc64fc7bc7a2d72947f ("[PATCH 1/2] tracing: kprobes: Prohibit probing on notrace functions") url: https://github.com/0day-ci/linux/commits/Francis-Deslauriers/tracing-kprobes-Prohibit-probing-on-notrace-functions/20180714-072854 in testcase: kernel_selftests with following parameters: group: kselftests-01 test-description: The kernel contains a set of "self tests" under the tools/testing/selftests/ directory. These are intended to be small unit tests to exercise individual code paths in the kernel. test-url: https://www.kernel.org/doc/Documentation/kselftest.txt on test machine: 8 threads Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz with 8G memory caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): KERNEL SELFTESTS: linux_headers_dir is /usr/src/linux-headers-x86_64-rhel-7.2-ecadccb31b8f1516dd045cc64fc7bc7a2d72947f 2018-07-18 22:17:02 ln -sf /usr/bin/clang-7 /usr/bin/clang 2018-07-18 22:17:02 ln -sf /usr/bin/llc-7 /usr/bin/llc 2018-07-18 22:17:47 make run_tests -C ftrace make: Entering directory '/usr/src/perf_selftests-x86_64-rhel-7.2-ecadccb31b8f1516dd045cc64fc7bc7a2d72947f/tools/testing/selftests/ftrace' TAP version 13 selftests: ftrace: ftracetest ======================================== === Ftrace unit tests === [1] Basic trace file check [PASS] [2] Basic test for tracers [PASS] [3] Basic trace clock test [PASS] [4] Basic event tracing check [PASS] [5] event tracing - enable/disable with event level files [PASS] [6] event tracing - restricts events based on pid [PASS] [7] event tracing - enable/disable with subsystem level files [PASS] [8] event tracing - enable/disable with top level files [PASS] [9] ftrace - function graph filters with stack tracer [PASS] [10] ftrace - function graph filters [PASS] [11] ftrace - function glob filters [PASS] [12] ftrace - function pid filters [PASS] [13] ftrace - test for function event triggers [PASS] [14] ftrace - function profiler with function tracing [PASS] [15] ftrace - test reading of set_ftrace_filter [PASS] [16] ftrace - test for function traceon/off triggers [PASS] [17] Test creation and deletion of trace instances while setting an event [PASS] [18] Test creation and deletion of trace instances [PASS] [19] Kprobe dynamic event - adding and removing [PASS] [20] Kprobe dynamic event - busy event check [PASS] [21] Kprobe dynamic event with arguments [PASS] [22] Kprobe event string type argument [FAIL] [23] Kprobe event argument syntax [PASS] [24] Kprobes event arguments with types [PASS] [25] Kprobe event auto/manual naming [PASS] [26] Kprobe dynamic event with function tracer [PASS] [27] Kprobe dynamic event - probing module [FAIL] [28] Kretprobe dynamic event with arguments [PASS] [29] Kretprobe dynamic event with maxactive [PASS] [30] Register/unregister many kprobe events [PASS] [31] Kprobe events - probe points [FAIL] [32] event trigger - test extended error support [PASS] [33] event trigger - test field variable support [PASS] [34] event trigger - test inter-event combined histogram trigger [PASS] [35] event trigger - test multiple actions on hist trigger [PASS] [36] event trigger - test inter-event histogram trigger onmatch action [PASS] [37] event trigger - test inter-event histogram trigger onmatch-onmax action [PASS] [38] event trigger - test inter-event histogram trigger onmax action [PASS] [39] event trigger - test synthetic event create remove [PASS] [40] event trigger - test event enable/disable trigger [PASS] [41] event trigger - test trigger filter [PASS] [42] event trigger - test histogram modifiers [PASS] [43] event trigger - test histogram trigger [PASS] [44] event trigger - test multiple histogram triggers [PASS] [45] event trigger - test snapshot-trigger [PASS] [46] event trigger - test stacktrace-trigger [PASS] [47] trace_marker trigger - test histogram trigger [PASS] [48] trace_marker trigger - test snapshot trigger [PASS] [49] trace_marker trigger - test histogram with synthetic event against kernel event [PASS] [50] trace_marker trigger - test histogram with synthetic event [PASS] [51] event trigger - test traceon/off trigger [PASS] [52] (instance) Basic test for tracers [PASS] [53] (instance) Basic trace clock test [PASS] [54] (instance) event tracing - enable/disable with event level files [PASS] [55] (instance) event tracing - restricts events based on pid [PASS] [56] (instance) event tracing - enable/disable with subsystem level files [PASS] [57] (instance) ftrace - test for function event triggers [PASS] [58] (instance) ftrace - test for function traceon/off triggers [PASS] [59] (instance) event trigger - test event enable/disable trigger [PASS] [60] (instance) event trigger - test trigger filter [PASS] [61] (instance) event trigger - test histogram modifiers [PASS] [62] (instance) event trigger - test histogram trigger [PASS] [63] (instance) event trigger - test multiple histogram triggers [PASS] [64] (instance) trace_marker trigger - test histogram trigger [PASS] [65] (instance) trace_marker trigger - test snapshot trigger [PASS] # of passed: 62 # of failed: 3 # of unresolved: 0 # of untested: 0 # of unsupported: 0 # of xfailed: 0 # of undefined(test bug): 0 not ok 1..1 selftests: ftrace: ftracetest [FAIL] make: Leaving directory '/usr/src/perf_selftests-x86_64-rhel-7.2-ecadccb31b8f1516dd045cc64fc7bc7a2d72947f/tools/testing/selftests/ftrace' to reproduce: git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp run job.yaml thanks, rong, chen