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Re: No output from trace file after a few hours
- From: Arkady <arkady dot miasnikov at gmail dot com>
- To: Daniel Doron <danielmeirdoron at gmail dot com>
- Cc: systemtap at sourceware dot org
- Date: Thu, 15 Jun 2017 14:03:46 +0300
- Subject: Re: No output from trace file after a few hours
- Authentication-results: sourceware.org; auth=none
- References: <CAFwN=+ywma7CvB6AajmEb99LKZkTg9fWP724to6r=FrKrB0stQ@mail.gmail.com> <CANA-60qKnB_x4UuPfej_H2ebkHNXepmqpE+dgnOT=kOV6MYbqw@mail.gmail.com> <CANA-60oP_i=0oCQ1e73B_96juT1gW10d2Q7yps_r-jPyo=AJKQ@mail.gmail.com> <CAFwN=+xs21q38vf_ZNN-QAr5-EOfSkoKUx-e3u8PaZ=GKOkkdA@mail.gmail.com> <CAFwN=+yn+TGsHKNmoCJBaqeJakRG=XS8uVGbN8a16a0z3UdXmQ@mail.gmail.com> <CAFwN=+xMd=iXUw79A0WkpjHY1Vii3tFzWh4=5vS7f9qdtfdSAQ@mail.gmail.com> <CAFwN=+x34nb0ZYBW1wYB=-4m-Ctyrd-tkT4wXS0bcDTdBNaOtg@mail.gmail.com> <CANA-60pBnzZrAkg_WJ1bLr+e1atAGeFbUcbU_ffrW=hTj0Q+dw@mail.gmail.com> <CAFwN=+w2u+QpZyPavfxf2i+QsrhaHbSnRcGzYLPOpLwK4TA4vA@mail.gmail.com> <CANA-60o1VWpywY6-YZCuyjHYVXxakRoZ4f=JnD9rRERH-rpjQA@mail.gmail.com> <CAFwN=+yAGLbX+a8fQQ2h2doXrEd2-OxLWKPO11xb8G96UifYOw@mail.gmail.com> <CANA-60r=U8tmEfiQJxfQ-u+vdDBgwHFzZHthXbL3uQbusrYNew@mail.gmail.com>
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.