<div dir="ltr"><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr">





<p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-variant-alternates:normal;font-kerning:auto;font-feature-settings:normal;font-stretch:normal;line-height:normal;color:rgb(0,0,0)"><font face="times new roman, serif" style=""><span style="font-variant-ligatures:no-common-ligatures">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 </span><span style="font-variant-ligatures:no-common-ligatures">6.5.0-14-generic #14~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC, </span><span style="font-variant-ligatures:no-common-ligatures">lttng (LTTng Trace Control) 2.13.10 - Nordicité. </span></font></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-variant-alternates:normal;font-kerning:auto;font-feature-settings:normal;font-stretch:normal;line-height:normal;color:rgb(0,0,0)"><span style="font-variant-ligatures:no-common-ligatures"><font face="times new roman, serif"><br></font></span></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-variant-alternates:normal;font-kerning:auto;font-feature-settings:normal;font-stretch:normal;line-height:normal;color:rgb(0,0,0)"><span style="font-variant-ligatures:no-common-ligatures"><font face="times new roman, serif">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?</font></span></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-variant-alternates:normal;font-kerning:auto;font-feature-settings:normal;font-stretch:normal;line-height:normal;color:rgb(0,0,0)"><span style="font-variant-ligatures:no-common-ligatures"><font face="times new roman, serif"><br></font></span></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-variant-alternates:normal;font-kerning:auto;font-feature-settings:normal;font-stretch:normal;line-height:normal;color:rgb(0,0,0)"><span style="font-variant-ligatures:no-common-ligatures"><font face="times new roman, serif">Thank you</font></span></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-variant-alternates:normal;font-kerning:auto;font-feature-settings:normal;font-stretch:normal;line-height:normal;color:rgb(0,0,0)"><span style="font-variant-ligatures:no-common-ligatures"><font face="times new roman, serif">Yonghong</font></span></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-variant-alternates:normal;font-kerning:auto;font-feature-settings:normal;font-stretch:normal;font-size:17px;line-height:normal;font-family:Menlo;color:rgb(0,0,0)"><span style="font-variant-ligatures:no-common-ligatures"><br></span></p>











<p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-variant-alternates:normal;font-kerning:auto;font-feature-settings:normal;font-stretch:normal;font-size:17px;line-height:normal;font-family:Menlo;color:rgb(0,0,0)"><span style="font-variant-ligatures:no-common-ligatures"><br></span></p><p style="margin:0px;font:17px Menlo;color:rgb(0,0,0)"><span style="font-variant-ligatures:no-common-ligatures">c:1016)</span></p><p style="margin:0px;font:17px Menlo;color:rgb(0,0,0)"><span style="font-variant-ligatures:no-common-ligatures">DBG1 - 00:24:25.134138433 [Client management]: Getting session auto-20240112-002417 by name (in process_client_msg() at client.c:1133)</span></p><p style="margin:0px;font:17px Menlo;color:rgb(0,0,0)"><span style="font-variant-ligatures:no-common-ligatures">DBG1 - 00:24:25.134148894 [Client management]: Creating UST session (in create_ust_session() at client.c:510)</span></p><p style="margin:0px;font:17px Menlo;color:rgb(0,0,0)"><span style="font-variant-ligatures:no-common-ligatures">DBG1 - 00:24:25.134267958 [Client management]: Spawning consumerd (in spawn_consumerd() at client.c:204)</span></p><p style="margin:0px;font:17px Menlo;color:rgb(0,0,0)"><span style="font-variant-ligatures:no-common-ligatures">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)</span></p><p style="margin:0px;font:17px Menlo;color:rgb(0,0,0)"><span style="font-variant-ligatures:no-common-ligatures">DBG1 - 00:24:25.135247552 [Consumer management]: Entering thread entry point (in launch_thread() at thread.c:65)</span></p><p style="margin:0px;font:17px Menlo;color:rgb(0,0,0)"><span style="font-variant-ligatures:no-common-ligatures">DBG1 - 00:24:25.135293542 [Consumer management]: [thread] Manage consumer started (in thread_consumer_management() at manage-consumer.c:65)</span></p><p style="margin:0px;font:17px Menlo;color:rgb(0,0,0)"><span style="font-variant-ligatures:no-common-ligatures">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)</span></p><p style="margin:0px;font:17px Menlo;color:rgb(0,0,0)"><span style="font-variant-ligatures:no-common-ligatures">DBG1 - 00:24:25.240725883 [Consumer management]: Consumer command socket ready (fd: 61) (in thread_consumer_management() at manage-consumer.c:204)</span></p><p style="margin:0px;font:17px Menlo;color:rgb(0,0,0)"><span style="font-variant-ligatures:no-common-ligatures">DBG1 - 00:24:25.240746802 [Consumer management]: Consumer metadata socket ready (fd: 62) (in thread_consumer_management() at manage-consumer.c:205)</span></p><p style="margin:0px;font:17px Menlo;color:rgb(0,0,0)"><span style="font-variant-ligatures:no-common-ligatures">DBG1 - 00:24:25.240775318 [Consumer management]: Sending consumer initialization command (in consumer_init() at consumer.c:1791)</span></p><p style="margin:0px;font:17px Menlo;color:rgb(0,0,0)"><span style="font-variant-ligatures:no-common-ligatures">DBG1 - 00:24:25.241066762 [Consumer management]: Marking consumer management thread as ready (in mark_thread_as_ready() at manage-consumer.c:31)</span></p><p style="margin:0px;font:17px Menlo;color:rgb(0,0,0)"><span style="font-variant-ligatures:no-common-ligatures">DBG1 - 00:24:25.241100481 [Client management]: Consumer management thread is ready (in wait_until_thread_is_ready() at manage-consumer.c:48)</span></p><p style="margin:0px;font:17px Menlo;color:rgb(0,0,0)"><span style="font-variant-ligatures:no-common-ligatures">DBG1 - 00:24:25.241138386 [Client management]: Setting relayd for session auto-20240112-002417 (in cmd_setup_relayd() at cmd.c:1004)</span></p><p style="margin:0px;font:17px Menlo;color:rgb(0,0,0)"><span style="font-variant-ligatures:no-common-ligatures">lttng-sessiond: unix.c:185: lttcomm_recv_unix_sock: Assertion `buf' failed.</span></p><p style="margin:0px;font:17px Menlo;color:rgb(0,0,0)"><span style="font-variant-ligatures:no-common-ligatures">Error: Events: No session daemon is available (channel channel0, session auto-20240112-002417)</span></p><p style="margin:0px;font:17px Menlo;color:rgb(0,0,0)"><span style="font-variant-ligatures:no-common-ligatures">[1]+<span>  </span>Aborted <span>                </span>(core dumped) lttng-sessiond --verbose</span></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-variant-alternates:normal;font-kerning:auto;font-feature-settings:normal;font-stretch:normal;font-size:17px;line-height:normal;font-family:Menlo;color:rgb(0,0,0)">






















</p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-variant-alternates:normal;font-kerning:auto;font-feature-settings:normal;font-stretch:normal;font-size:17px;line-height:normal;font-family:Menlo;color:rgb(0,0,0)"><span style="font-variant-ligatures:no-common-ligatures">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)</span></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-variant-alternates:normal;font-kerning:auto;font-feature-settings:normal;font-stretch:normal;font-size:17px;line-height:normal;font-family:Menlo;color:rgb(0,0,0)"><span style="font-variant-ligatures:no-common-ligatures"><br></span></p><div dir="ltr"><div dir="ltr"><p style="font-size:12.8px"></p></div><div dir="ltr"></div></div></div></div></div></div></div></div></div></div>