Re: No output from trace file after a few hours

[Daniel Doron <danielmeirdoron at gmail dot com>]

ok

On Thu, Jun 15, 2017 at 2:59 PM, Arkady <arkady.miasnikov@gmail.com> wrote:
> you can also try  --suppress-time-limits
>
> On Thu, Jun 15, 2017 at 2:32 PM, Arkady <arkady.miasnikov@gmail.com> wrote:
>> One possible reason is a system update which caused lot of probes to trigger.
>>
>> On Thu, Jun 15, 2017 at 2:13 PM, Daniel Doron <danielmeirdoron@gmail.com> wrote:
>>> I will try that.
>>> BTW, this also just happened after almost 24 hours on kernel 4.11.3-1-ARCH
>>>
>>> On Thu, Jun 15, 2017 at 2:05 PM, Arkady <arkady.miasnikov@gmail.com> wrote:
>>>> This works fine
>>>>
>>>> sudo stap -D MAXSKIPPED=0 -D MAXTRYLOCK=1000 -D TRYLOCKDELAY=100  -F
>>>> -o ./test.log -S 1,2  test.stp
>>>>
>>>> On Thu, Jun 15, 2017 at 2:03 PM, Arkady <arkady.miasnikov@gmail.com> wrote:
>>>>> STAP simply quits in a couple of seconds
>>>>>
>>>>> sudo stap -F -o ./test.log -S 1,2  test.stp
>>>>> 94089
>>>>> ps -ef | grep -v "grep" | grep  94089
>>>>>
>>>>> On Thu, Jun 15, 2017 at 1:53 PM, Arkady <arkady.miasnikov@gmail.com> wrote:
>>>>>> Interesting. I have reproduced the problem by running two tight bash
>>>>>> loops simultaneously
>>>>>>
>>>>>> sudo stap -F -o ./test.log -S 1,2  test.stp
>>>>>> while [ 1 ];do ls > /dev/null;done &
>>>>>> while [ 1 ];do echo -en "\033[0;0H";ls -l | grep "test.log";echo -en
>>>>>> "\033[0;0H";done;
>>>>>>
>>>>>> Linux centos6 2.6.32-642.el6.x86_64 #1 SMP Tue May 10 17:27:01 UTC
>>>>>> 2016 x86_64 x86_64 x86_64 GNU/Linux
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Thu, Jun 15, 2017 at 11:59 AM, Daniel Doron
>>>>>> <danielmeirdoron@gmail.com> wrote:
>>>>>>> On that specific kernel about 8-10 hours.
>>>>>>> On my machine with latest kernel, been running for 24 hours.
>>>>>>> I need to check other distros.
>>>>>>>
>>>>>>> sudo stap -v -F -m mymodule test.stp
>>>>>>>
>>>>>>> On Thu, Jun 15, 2017 at 11:26 AM, Arkady <arkady.miasnikov@gmail.com> wrote:
>>>>>>>> Do you do something like
>>>>>>>>
>>>>>>>> sudo stap -F -o ./test.log -S 1,2  test.stp ?
>>>>>>>>
>>>>>>>> On Thu, Jun 15, 2017 at 11:25 AM, Daniel Doron
>>>>>>>> <danielmeirdoron@gmail.com> wrote:
>>>>>>>>> On that specific kernel about 8-10 hours.
>>>>>>>>> On my machine with latest kernel, been running for 24 hours.
>>>>>>>>> I need to check other distros.
>>>>>>>>>
>>>>>>>>> On Jun 15, 2017 11:18, "Arkady" <arkady.miasnikov@gmail.com> wrote:
>>>>>>>>>>
>>>>>>>>>> How long time it runs for you?
>>>>>>>>>>
>>>>>>>>>> On Thu, Jun 15, 2017 at 10:38 AM, Daniel Doron
>>>>>>>>>> <danielmeirdoron@gmail.com> wrote:
>>>>>>>>>> > Systemtap translator/driver (version 2.9/0.164, rpm 2.9-7.el6)
>>>>>>>>>> > Copyright (C) 2005-2015 Red Hat, Inc. and others
>>>>>>>>>> > This is free software; see the source for copying conditions.
>>>>>>>>>> > enabled features: AVAHI LIBRPM LIBSQLITE3 NLS NSS TR1_UNORDERED_MAP
>>>>>>>>>> >
>>>>>>>>>> > On Thu, Jun 15, 2017 at 10:37 AM, Daniel Doron
>>>>>>>>>> > <danielmeirdoron@gmail.com> wrote:
>>>>>>>>>> >> BTW kernel version: 2.6.32-431.el6.x86_64
>>>>>>>>>> >>
>>>>>>>>>> >> On Thu, Jun 15, 2017 at 10:36 AM, Daniel Doron
>>>>>>>>>> >> <danielmeirdoron@gmail.com> wrote:
>>>>>>>>>> >>> if you mean that the kernel version does not get upgraded, then yes.
>>>>>>>>>> >>>
>>>>>>>>>> >>> On Thu, Jun 15, 2017 at 10:34 AM, Daniel Doron
>>>>>>>>>> >>> <danielmeirdoron@gmail.com> wrote:
>>>>>>>>>> >>>> Sorry, I do not know what you mean by that...
>>>>>>>>>> >>>>
>>>>>>>>>> >>>> On Thu, Jun 15, 2017 at 10:32 AM, Arkady <arkady.miasnikov@gmail.com>
>>>>>>>>>> >>>> wrote:
>>>>>>>>>> >>>>> Do you have the kernel version pinned?
>>>>>>>>>> >>>>>
>>>>>>>>>> >>>>> On Thu, Jun 15, 2017 at 10:12 AM, Arkady
>>>>>>>>>> >>>>> <arkady.miasnikov@gmail.com> wrote:
>>>>>>>>>> >>>>>> Please send the stap script
>>>>>>>>>> >>>>>>
>>>>>>>>>> >>>>>> On Thu, Jun 15, 2017 at 10:10 AM, Daniel Doron
>>>>>>>>>> >>>>>> <danielmeirdoron@gmail.com> wrote:
>>>>>>>>>> >>>>>>> Hi,
>>>>>>>>>> >>>>>>>
>>>>>>>>>> >>>>>>> I built my module to probe a few system calls and functions.
>>>>>>>>>> >>>>>>> Nothing
>>>>>>>>>> >>>>>>> fancy, no big work in it, just prints some data. Then I wrote a
>>>>>>>>>> >>>>>>> simple
>>>>>>>>>> >>>>>>> python script to read data directly off the
>>>>>>>>>> >>>>>>> /sys/kernel/debug/systemtap/mymodule/trace0 file (of course
>>>>>>>>>> >>>>>>> running as
>>>>>>>>>> >>>>>>> sudo)
>>>>>>>>>> >>>>>>> I run stap in Flight recorder mode.
>>>>>>>>>> >>>>>>> After a few hours (varies from 8 to 20) I stop getting any output
>>>>>>>>>> >>>>>>> from
>>>>>>>>>> >>>>>>> the module...
>>>>>>>>>> >>>>>>> Any idea how to check why that is?
>>>>>>>>>> >>>>>>> dmesg does not report anything unusual...
>>>>>>>>>> >>>>>>>
>>>>>>>>>> >>>>>>> Thanks.
>>>>>>>>>> >>>>>>> Daniel.