[lttng-dev] LTTng sessiond daemon Assertion `buf' failed and killed

[Kienan Stewart]

Hi Yonghong,

in a brief test I'm unable to reproduce the error you see by running the 
following commands on an Ubuntu 22.04 installation with lttng-tools 
2.13.10, lttng-ust 2.13.6, urcu stable-0.12, and babeltrace stable-2.0.
```
$ uname -r -v
6.5.0-14-generic #14~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Mon Nov 20 
18:15:30 UTC 2

$ lttng-relayd -v -b
$ lttng-sessiond -v -b
$ lttng create
$ lttng enable-event -u --all
```

Could you please review the bug reporting guidelines at 
https://lttng.org/community/ and elaborate on the steps taken to 
reproduce the issue?

thanks,
kienan

On 1/12/24 08:12, Yonghong Yan via lttng-dev wrote:
> I am not sure whether this is my setting problem or a bug with a 
> more recent kernel. lttng-sessiond was killed when I tried to "enable 
> event" after a session was created. See below part of the verbose output 
> of the sessiond. It is observed on Ubuntu 22.04, kernel 6.5.0-14-generic 
> #14~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC, lttng (LTTng Trace Control) 
> 2.13.10 - Nordicité.
> 
> 
> The same version of LTTng works on another Ubuntu 22.04 machine, but 
> with kernel 6.2.0-33-generic. Any suggestion on what I should try?
> 
> 
> Thank you
> 
> Yonghong
> 
> 
> 
> c:1016)
> 
> DBG1 - 00:24:25.134138433 [Client management]: Getting session 
> auto-20240112-002417 by name (in process_client_msg() at client.c:1133)
> 
> DBG1 - 00:24:25.134148894 [Client management]: Creating UST session (in 
> create_ust_session() at client.c:510)
> 
> DBG1 - 00:24:25.134267958 [Client management]: Spawning consumerd (in 
> spawn_consumerd() at client.c:204)
> 
> DBG1 - 00:24:25.135155823 [Client management]: Waiting for consumer 
> management thread to be ready (in wait_until_thread_is_ready() at 
> manage-consumer.c:46)
> 
> DBG1 - 00:24:25.135247552 [Consumer management]: Entering thread entry 
> point (in launch_thread() at thread.c:65)
> 
> DBG1 - 00:24:25.135293542 [Consumer management]: [thread] Manage 
> consumer started (in thread_consumer_management() at manage-consumer.c:65)
> 
> DBG1 - 00:24:25.135335776 [Client management]: Using 64-bit UST consumer 
> at: /usr/lib/x86_64-linux-gnu/lttng/libexec/lttng-consumerd (in 
> spawn_consumerd() at client.c:284)
> 
> DBG1 - 00:24:25.240725883 [Consumer management]: Consumer command socket 
> ready (fd: 61) (in thread_consumer_management() at manage-consumer.c:204)
> 
> DBG1 - 00:24:25.240746802 [Consumer management]: Consumer metadata 
> socket ready (fd: 62) (in thread_consumer_management() at 
> manage-consumer.c:205)
> 
> DBG1 - 00:24:25.240775318 [Consumer management]: Sending consumer 
> initialization command (in consumer_init() at consumer.c:1791)
> 
> DBG1 - 00:24:25.241066762 [Consumer management]: Marking consumer 
> management thread as ready (in mark_thread_as_ready() at 
> manage-consumer.c:31)
> 
> DBG1 - 00:24:25.241100481 [Client management]: Consumer management 
> thread is ready (in wait_until_thread_is_ready() at manage-consumer.c:48)
> 
> DBG1 - 00:24:25.241138386 [Client management]: Setting relayd for 
> session auto-20240112-002417 (in cmd_setup_relayd() at cmd.c:1004)
> 
> lttng-sessiond: unix.c:185: lttcomm_recv_unix_sock: Assertion `buf' failed.
> 
> Error: Events: No session daemon is available (channel channel0, session 
> auto-20240112-002417)
> 
> [1]+Aborted (core dumped) lttng-sessiond --verbose
> 
> DBG1 - 00:24:26.357769106 [Run-as worker]: run_as worker exiting (ret = 
> 0) (in run_as_create_worker_no_lock() at runas.c:1526)
> 
> 
> 
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