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

[Vince Weaver]

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

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