Re: [PATCH] libtracefs: Destroy synthetic and eprobes before other events

[Metin Kaya <metin.kaya@arm.com>]

On 17/10/2024 9:01 pm, Steven Rostedt wrote:
> On Thu, 17 Oct 2024 09:38:35 +0100
> Metin Kaya <metin.kaya@arm.com> wrote:
> 
>> I see one more failure in this section of unit tests:
>>
>>     Test: tracefs_iterate_snapshot_events API ...FAILED
>>       1. tracefs-utest.c:235  - ret == sizeof(struct test_sample)
>>       2. tracefs-utest.c:235  - ret == sizeof(struct test_sample)
>>       3. tracefs-utest.c:235  - ret == sizeof(struct test_sample)
>>
> 
> Does this occur without this patch? IOW, is this caused by this patch?

I thought there were 2 "tracefs-utest.c:235  - ret == sizeof(struct 
test_sample)" failures before this patch and this patch increased the 
number of failures by 1. However, this does not seem to be 100% correct. 
I sometimes see only 1 failure, but then there are 2-3 of them.

I do trace-cmd reset && unmount before running the unit tests.

> 
>> I did run trace-cmd reset and unmounted my tracefs before running the
>> unit tests.
>> Please feel free to ignore if something is weirdly wrong in my setup.
>>
>> Other than that -kind of existing- failure, the patch looks good to me
>> (e.g., trace-cmd unit tests are working fine).
> 
> 
> Can you add a printf("ret = %d\n", ret) to find out what "ret" is?

Here is the output with printf's:

   ...
   Test: tracefs_iterate_snapshot_events API ...
line=237 i=87 path=n~_ cpu=55 value=2046397138 ret=-1
FAILED
     1. tracefs-utest.c:240  - ret == sizeof(struct test_sample)
   Test: tracefs_iterate_raw_events API ...
line=237 i=1444 path=~_ cpu=50 value=1150454427 ret=-1
FAILED
     1. tracefs-utest.c:240  - ret == sizeof(struct test_sample)
   Test: Follow events ...passed
   ...
   Test: uprobes ...
line=2229 ename=utest_u 
address=/libtracefs/utest/trace-utest:0x00000000000003e8 event=utest_u 
system=utest format=arg1=$stack2 prefix=p type=0x000004 ret=-1

line=2229 ename=utest_r 
address=/libtracefs/utest/trace-utest:0x00000000000003e8 event=utest_r 
system=utest format=arg1=$retval prefix=r type=0x000008 ret=-1
FAILED
     1. tracefs-utest.c:2232  - ret == 0
     2. tracefs-utest.c:2232  - ret == 0


And this is the output with your "libtracefs utest: Fixes and new tests" 
patch series [1]:

   Test: tracefs_iterate_raw_events API ...
line=237 i=2532 path=Db cpu=0 value=1144606227 ret=-1

line=237 i=1285 path=ו3b cpu=6 value=1157898007 ret=-1
FAILED
     1. tracefs-utest.c:240  - ret == sizeof(struct test_sample)
     2. tracefs-utest.c:240  - ret == sizeof(struct test_sample)
   Test: Follow events ...passed
   Test: Follow events clear ...passed
   Test: tracefs_tracers API ...passed
   Test: tracefs_local events API ...passed
   Test: tracefs_instances_walk API ...passed
   Test: tracefs_get_clock API ...passed
   Test: tracing on / off ...passed
   Test: tracing options ...passed
   Test: custom system directory ...passed
   Test: ftrace marker ...passed
   Test: kprobes ...passed
   Test: synthetic events ...passed
   Test: eprobes ...passed
   Test: uprobes ...
line=2249 ename=utest_u 
address=/ssd/tracecmd-work/libtracefs/utest/trace-utest:0x00000000000003e8 
event=utest_u system=utest format=arg1=$stack2 prefix=p type=0x000004 ret=-1

line=2249 ename=utest_r 
address=/ssd/tracecmd-work/libtracefs/utest/trace-utest:0x00000000000003e8 
event=utest_r system=utest format=arg1=$retval prefix=r type=0x000008 ret=-1
FAILED
     1. tracefs-utest.c:2252  - ret == 0
     2. tracefs-utest.c:2252  - ret == 0
   Test: multi probe test ...
line=2249 ename=utest_u 
address=/ssd/tracecmd-work/libtracefs/utest/trace-utest:0x00000000000003e8 
event=utest_u system=utest format=arg1=$stack2 prefix=p type=0x000004 ret=-1

line=2249 ename=utest_r 
address=/ssd/tracecmd-work/libtracefs/utest/trace-utest:0x00000000000003e8 
event=utest_r system=utest format=arg1=$retval prefix=r type=0x000008 ret=-1
FAILED
     1. tracefs-utest.c:2252  - ret == 0
     2. tracefs-utest.c:2252  - ret == 0

Thanks,

[1] 
https://lore.kernel.org/linux-trace-devel/20241017200609.932728-1-rostedt@goodmis.org