Re: No output from trace file after a few hours

[Arkady <arkady dot miasnikov at gmail dot com>]

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.