Re: perf, kprobes: fuzzer generates huge number of WARNings

From: Vince Weaver
Date: Tue Jul 07 2015 - 11:05:00 EST


On Tue, 7 Jul 2015, Vince Weaver wrote:

> On Tue, 7 Jul 2015, Masami Hiramatsu wrote:
>
> > > It's a Hawell machine running 4.2-rc1. I can post the .config if it's of
> > > interest.
> >
> > Yes, I'm interested in.
>
> I've put it here:
> http://web.eece.maine.edu/~vweaver/junk/haswell-config
>
> > OK, and also, if you have a chance, please run the ftracetest as below.
> >
> > $ cd tools/testing/selftest/ftrace/
> > $ sudo ./ftracetest
> >
> > This will do a series of basic tests on ftrace and report it.
>
> It won't run:
> sudo ./ftracetest
> Error: No ftrace directory found
>

OK here are the results when I mounted debugfs in the right place.

sudo ./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 - enable/disable with subsystem level files [PASS]
[7] event tracing - enable/disable with top level files [PASS]
[8] ftrace - function graph filters with stack tracer [UNSUPPORTED]
execute:
/home/vince/research/linux-kernel/linux-git/tools/testing/selftests/ftrace/test.d/ftrace/fgraph-filter-stack.tc
+ .
/home/vince/research/linux-kernel/linux-git/tools/testing/selftests/ftrace/test.d/ftrace/fgraph-filter-stack.tc
+ grep -q function_graph available_tracers
+ [ ! -f set_ftrace_filter ]
+ disable_tracing
+ echo 0
+ clear_trace
+ echo
+ echo schedule
+ echo function_graph
+ [ ! -f stack_trace ]
+ echo Stack tracer not configured
Stack tracer not configured
+ do_reset
+ reset_tracer
+ echo nop
+ [ -e /proc/sys/kernel/stack_tracer_enabled ]
+ enable_tracing
+ echo 1
+ clear_trace
+ echo
+ echo
+ exit_unsupported
+ kill -s 40 2725
+ exit 0
[9] ftrace - function graph filters [PASS]
[10] ftrace - function profiler with function tracing [UNSUPPORTED]
execute:
/home/vince/research/linux-kernel/linux-git/tools/testing/selftests/ftrace/test.d/ftrace/func_profiler.tc
+ .
/home/vince/research/linux-kernel/linux-git/tools/testing/selftests/ftrace/test.d/ftrace/func_profiler.tc
+ grep -q function_graph available_tracers
+ [ ! -f set_ftrace_filter ]
+ [ ! -f function_profile_enabled ]
+ echo function_profile_enabled not found, function profiling enabled?
function_profile_enabled not found, function profiling enabled?
+ exit_unsupported
+ kill -s 40 2725
+ exit 0
[11] Kprobe dynamic event - adding and removing [FAIL]
execute:
/home/vince/research/linux-kernel/linux-git/tools/testing/selftests/ftrace/test.d/kprobe/add_and_remove.tc
+ .
/home/vince/research/linux-kernel/linux-git/tools/testing/selftests/ftrace/test.d/kprobe/add_and_remove.tc
+ [ -f kprobe_events ]
+ echo 0
+ echo
+ echo p:myevent do_fork
sh: echo: I/O error
[12] Kprobe dynamic event - busy event check [FAIL]
execute:
/home/vince/research/linux-kernel/linux-git/tools/testing/selftests/ftrace/test.d/kprobe/busy_check.tc
+ .
/home/vince/research/linux-kernel/linux-git/tools/testing/selftests/ftrace/test.d/kprobe/busy_check.tc
+ [ -f kprobe_events ]
+ echo 0
+ echo
+ echo p:myevent do_fork
sh: echo: I/O error
[13] Kprobe dynamic event with arguments [FAIL]
execute:
/home/vince/research/linux-kernel/linux-git/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args.tc
+ .
/home/vince/research/linux-kernel/linux-git/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args.tc
+ [ -f kprobe_events ]
+ echo 0
+ echo
+ echo p:testprobe do_fork $stack $stack0 +0($stack)
sh: echo: I/O error
[14] Kprobe dynamic event with function tracer [FAIL]
execute:
/home/vince/research/linux-kernel/linux-git/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc
+ .
/home/vince/research/linux-kernel/linux-git/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc
+ [ -f kprobe_events ]
+ grep function available_tracers
blk function_graph function nop
+ echo nop
+ echo do_fork
sh: echo: I/O error
[15] Kretprobe dynamic event with arguments [FAIL]
execute:
/home/vince/research/linux-kernel/linux-git/tools/testing/selftests/ftrace/test.d/kprobe/kretprobe_args.tc
+ .
/home/vince/research/linux-kernel/linux-git/tools/testing/selftests/ftrace/test.d/kprobe/kretprobe_args.tc
+ [ -f kprobe_events ]
+ echo 0
+ echo
+ echo r:testprobe2 do_fork $retval
sh: echo: I/O error

# of passed: 8
# of failed: 5
# of unresolved: 0
# of untested: 0
# of unsupported: 2
# of xfailed: 0
# of undefined(test bug): 0

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/