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

[Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>]

On 2015/07/08 0:11, Vince Weaver wrote:
> 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.

Thanks, I've found do_fork does not exist anymore... that caused the
failure.
Unsupported results are just because of the lack of function profiler
from kconfig.

Thank you for reporting!

> 
> 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
> 
> 


-- 
Masami HIRAMATSU
Linux Technology Research Center, System Productivity Research Dept.
Center for Technology Innovation - Systems Engineering
Hitachi, Ltd., Research & Development Group
E-mail: masami.hiramatsu.pt@hitachi.com