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boundary="===============6748333623123689776==" Errors-To: lttng-dev-bounces@lists.lttng.org Sender: "lttng-dev" --===============6748333623123689776== Content-Language: en-GB Content-Type: multipart/alternative; boundary="_000_MW3PR12MB4555080ACAE20ED17F263B8CD94F2MW3PR12MB4555namp_" --_000_MW3PR12MB4555080ACAE20ED17F263B8CD94F2MW3PR12MB4555namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Yes. We are trying to join only the threads related to the application. The= timeout is happening while trying to join the threads started by the appli= cation. Regards, Lakshmi ________________________________ From: Kienan Stewart Sent: 13 February 2024 20:50 To: Lakshmi Deverkonda ; lttng-dev@lists.lttng.org Subject: Re: [lttng-dev] Crash in application due to watchdog timeout with = python3 lttng External email: Use caution opening links or attachments Hi Lakshmi, when the lttngust python agent starts, it attempts to connect to one or more session daemons[1]. Each connection starts a thread that loops forever, retrying the registration in case an exception occurs[2]. I don't think the it's designed to have `join()` called on those threads, which I assume is happening in some of the code you or your team have written. My initial thought is that you should `join()` only the threads that pertinent to your application, ignoring the lttngust agent threads and then exit the application as normal. [1]: https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fgithub.= com%2Flttng%2Flttng-ust%2Fblob%2F3287f48be61ef3491aff0a80b7185ac57b3d8a5d%2= Fsrc%2Fpython-lttngust%2Flttngust%2Fagent.py%23L334&data=3D05%7C02%7Claksd%= 40nvidia.com%7Cbdf064d348474249f14a08dc2ca755c9%7C43083d15727340c1b7db39efd= 9ccc17a%7C0%7C0%7C638434344447867621%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLj= AwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=3D7= tmpFtjl7RkTVgYLr2YjdlPs2oM1F%2FXOg6W51mHDCws%3D&reserved=3D0 [2]: https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fgithub.= com%2Flttng%2Flttng-ust%2Fblob%2F3287f48be61ef3491aff0a80b7185ac57b3d8a5d%2= Fsrc%2Fpython-lttngust%2Flttngust%2Fagent.py%23L83&data=3D05%7C02%7Claksd%4= 0nvidia.com%7Cbdf064d348474249f14a08dc2ca755c9%7C43083d15727340c1b7db39efd9= ccc17a%7C0%7C0%7C638434344447874777%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjA= wMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=3DPK= b8rKDWFKmuuVB4YQEL8ZtAP%2B%2BYfTniUuLN9fFBctc%3D&reserved=3D0 thanks, kienan On 2/13/24 09:23, Lakshmi Deverkonda via lttng-dev wrote: > Hi, > > We are able to integrate python3 lttng module in our application(python3 > based). However, we are seeing that whenever the application terminates, > there is watchdog timeout due to timeout in joining the threads. What > could be the reason for this ? Does lttng module hold any thread event > locks ? > We are completely blocked on this issue. Could you please help ? > > Here is the snippet of the core dump > > (gdb) py-bt > Traceback (most recent call first): > File "/usr/lib/python3.7/threading.py", line 1048, in > _wait_for_tstate_lock > elif lock.acquire(block, timeout): > File "/usr/lib/python3.7/threading.py", line 1032, in join > self._wait_for_tstate_lock() > File "/usr/lib/python3/dist-packages/h.py", line 231, in JoinThreads > self.TT.join() > File "/usr/sbin/c", line 1466, in do_exit > H.JoinThreads() > File "/usr/sbin/c", line 7201, in main > do_exit(nlm, status) > File "/usr/sbin/c", line 7233, in > main() > (gdb) > > On a parallel note, thanks to Kienan who has been trying to provide > pointers on various issues reported so far. > > Need help on this issue as well. > Thanks in advance, > > Regards, > Lakshmi > > > > _______________________________________________ > lttng-dev mailing list > lttng-dev@lists.lttng.org > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Flists= .lttng.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Flttng-dev&data=3D05%7C02%7Claks= d%40nvidia.com%7Cbdf064d348474249f14a08dc2ca755c9%7C43083d15727340c1b7db39e= fd9ccc17a%7C0%7C0%7C638434344447880631%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4w= LjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata= =3D2iVi8xLrTS1Dj%2FcF3V30q0OjCvMP4kTpOUSthJvnZI0%3D&reserved=3D0 --_000_MW3PR12MB4555080ACAE20ED17F263B8CD94F2MW3PR12MB4555namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
Yes. We are trying to join only the threads related to the application. The= timeout is happening while trying to join the threads started by the appli= cation.   

Regards,
Lakshmi
From: Kienan Stewart <ks= tewart@efficios.com>
Sent: 13 February 2024 20:50
To: Lakshmi Deverkonda <laksd@nvidia.com>; lttng-dev@lists.ltt= ng.org <lttng-dev@lists.lttng.org>
Subject: Re: [lttng-dev] Crash in application due to watchdog timeou= t with python3 lttng
 
External email: Use caution opening links or attac= hments


Hi Lakshmi,

when the lttngust python agent starts, it attempts to connect to one or
more session daemons[1].

Each connection starts a thread that loops forever, retrying the
registration in case an exception occurs[2].

I don't think the it's designed to have `join()` called on those
threads, which I assume is happening in some of the code you or your
team have written.

My initial thought is that you should `join()` only the threads that
pertinent to your application, ignoring the lttngust agent threads and
then exit the application as normal.

[1]:
https://nam11.= safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fgithub.com%2Flttng%2F= lttng-ust%2Fblob%2F3287f48be61ef3491aff0a80b7185ac57b3d8a5d%2Fsrc%2Fpython-= lttngust%2Flttngust%2Fagent.py%23L334&data=3D05%7C02%7Claksd%40nvidia.c= om%7Cbdf064d348474249f14a08dc2ca755c9%7C43083d15727340c1b7db39efd9ccc17a%7C= 0%7C0%7C638434344447867621%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQ= IjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=3D7tmpFtj= l7RkTVgYLr2YjdlPs2oM1F%2FXOg6W51mHDCws%3D&reserved=3D0
[2]:
https://nam11.s= afelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fgithub.com%2Flttng%2Fl= ttng-ust%2Fblob%2F3287f48be61ef3491aff0a80b7185ac57b3d8a5d%2Fsrc%2Fpython-l= ttngust%2Flttngust%2Fagent.py%23L83&data=3D05%7C02%7Claksd%40nvidia.com= %7Cbdf064d348474249f14a08dc2ca755c9%7C43083d15727340c1b7db39efd9ccc17a%7C0%= 7C0%7C638434344447874777%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIj= oiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=3DPKb8rKDWF= KmuuVB4YQEL8ZtAP%2B%2BYfTniUuLN9fFBctc%3D&reserved=3D0

thanks,
kienan

On 2/13/24 09:23, Lakshmi Deverkonda via lttng-dev wrote:
> Hi,
>
> We are able to integrate python3 lttng module in our application(pytho= n3
> based). However, we are seeing that whenever the application terminate= s,
> there is watchdog timeout due to timeout in joining the threads. What<= br> > could be the reason for this ? Does lttng module hold any thread event=
> locks ?
> We are completely blocked on this issue. Could you please help ?
>
> Here is the snippet of the core dump
>
> (gdb) py-bt
> Traceback (most recent call first):
>    File "/usr/lib/python3.7/threading.py", li= ne 1048, in
> _wait_for_tstate_lock
>      elif lock.acquire(block, timeout):
>    File "/usr/lib/python3.7/threading.py", li= ne 1032, in join
>      self._wait_for_tstate_lock()
>    File "/usr/lib/python3/dist-packages/h.py"= , line 231, in JoinThreads
>      self.TT.join()
>    File "/usr/sbin/c", line 1466, in do_exit<= br> >      H.JoinThreads()
>    File "/usr/sbin/c", line 7201, in main
>      do_exit(nlm, status)
>    File "/usr/sbin/c", line 7233, in <modu= le>
>      main()
> (gdb)
>
> On a parallel note, thanks to Kienan who has been trying to provide > pointers on various issues reported so far.
>
> Need help on this issue as well.
> Thanks in advance,
>
> Regards,
> Lakshmi
>
>
>
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