Re: No output from trace file after a few hours

[Daniel Doron <danielmeirdoron at gmail dot com>]

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.