This is the mail archive of the systemtap@sourceware.org mailing list for the systemtap project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: No output from trace file after a few hours


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.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]