On 19 September 2017 at 10:55, Steven Rostedt <rostedt@xxxxxxxxxxx> wrote: > On Tue, 5 Sep 2017 13:49:52 +0100 > Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> wrote: > >> OK, thanks for spotting that. >> >> I will fix and resend after the merge window closes. > > I also just applied your patches (to 4.13-rc7) and ran the ftrace self > tests in tools/testing/selftests/ftrace/ftracetest and it triggered > this: > Thanks Steven. I'm a bit puzzled how changing the struct tracepoint pointers into relative references would result in a behavioral change like this, but I take it this doesn't occur with a plain -rc7 build? (Just asking) Unfortunately, I am failing to reproduce this running a kernel built from your .config on a 4-way SMP QEMU VM running under KVM (log below) I do get a lot of trace_kprobe errors (attached), but I get these with a plain v4.13-rc7 as well, so that seems unrelated. So I will update my series to address the issue reported by Jessica, and I would appreciate it if you can check whether that version still triggers this issue, but there is not a whole lot I can do to fix it atm. Thanks, Ard. $ sudo tools/testing/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 - test for function event triggers [PASS] [12] ftrace - function glob filters [PASS] [13] ftrace - function pid filters [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] Kprobes event arguments with types [PASS] [23] Kprobe event auto/manual naming [PASS] [24] Kprobe dynamic event with function tracer [PASS] [25] Kprobe dynamic event - probing module [PASS] [26] Kretprobe dynamic event with arguments [PASS] [27] Kretprobe dynamic event with maxactive [PASS] [28] Register/unregister many kprobe events [PASS] [29] event trigger - test event enable/disable trigger [PASS] [30] event trigger - test trigger filter [PASS] [31] event trigger - test histogram modifiers [PASS] [32] event trigger - test histogram trigger [PASS] [33] event trigger - test multiple histogram triggers [PASS] [34] event trigger - test snapshot-trigger [PASS] [35] event trigger - test stacktrace-trigger [PASS] [36] event trigger - test traceon/off trigger [PASS] [37] (instance) Basic test for tracers [PASS] [38] (instance) Basic trace clock test [PASS] [39] (instance) event tracing - enable/disable with event level files [PASS] [40] (instance) event tracing - restricts events based on pid [PASS] [41] (instance) event tracing - enable/disable with subsystem level files [PASS] [42] (instance) ftrace - test for function event triggers [PASS] [43] (instance) ftrace - test for function traceon/off triggers [PASS] [44] (instance) event trigger - test event enable/disable trigger [PASS] [45] (instance) event trigger - test trigger filter [PASS] [46] (instance) event trigger - test histogram modifiers [PASS] [47] (instance) event trigger - test histogram trigger [PASS] [48] (instance) event trigger - test multiple histogram triggers [PASS] # of passed: 48 # of failed: 0 # of unresolved: 0 # of untested: 0 # of unsupported: 0 # of xfailed: 0 # of undefined(test bug): 0
Attachment:
trace-kprobe-errors
Description: Binary data
