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 application.
Regards, Lakshmi ________________________________ From: Kienan Stewart <kstew...@efficios.com> Sent: 13 February 2024 20:50 To: Lakshmi Deverkonda <la...@nvidia.com>; lttng-dev@lists.lttng.org <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=https%3A%2F%2Fgithub.com%2Flttng%2Flttng-ust%2Fblob%2F3287f48be61ef3491aff0a80b7185ac57b3d8a5d%2Fsrc%2Fpython-lttngust%2Flttngust%2Fagent.py%23L334&data=05%7C02%7Claksd%40nvidia.com%7Cbdf064d348474249f14a08dc2ca755c9%7C43083d15727340c1b7db39efd9ccc17a%7C0%7C0%7C638434344447867621%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=7tmpFtjl7RkTVgYLr2YjdlPs2oM1F%2FXOg6W51mHDCws%3D&reserved=0<https://github.com/lttng/lttng-ust/blob/3287f48be61ef3491aff0a80b7185ac57b3d8a5d/src/python-lttngust/lttngust/agent.py#L334> [2]: https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Flttng%2Flttng-ust%2Fblob%2F3287f48be61ef3491aff0a80b7185ac57b3d8a5d%2Fsrc%2Fpython-lttngust%2Flttngust%2Fagent.py%23L83&data=05%7C02%7Claksd%40nvidia.com%7Cbdf064d348474249f14a08dc2ca755c9%7C43083d15727340c1b7db39efd9ccc17a%7C0%7C0%7C638434344447874777%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=PKb8rKDWFKmuuVB4YQEL8ZtAP%2B%2BYfTniUuLN9fFBctc%3D&reserved=0<https://github.com/lttng/lttng-ust/blob/3287f48be61ef3491aff0a80b7185ac57b3d8a5d/src/python-lttngust/lttngust/agent.py#L83> 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 <module> > 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=https%3A%2F%2Flists.lttng.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Flttng-dev&data=05%7C02%7Claksd%40nvidia.com%7Cbdf064d348474249f14a08dc2ca755c9%7C43083d15727340c1b7db39efd9ccc17a%7C0%7C0%7C638434344447880631%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=2iVi8xLrTS1Dj%2FcF3V30q0OjCvMP4kTpOUSthJvnZI0%3D&reserved=0<https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev>
_______________________________________________ lttng-dev mailing list lttng-dev@lists.lttng.org https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
