On Mon, Aug 12, 2013 at 8:31 AM, Stanislav Vovk <stanislav.v...@ericsson.com> wrote: > Hi, > > No, "Bob" did not belong to group "tracing"! > > I created group "tracing", added Bob to it(as secondary group, "users" is > primary) and could successfully see all events registered by program run as > Bob. Thanks for that!
Glad I could help! > One problem though, when I took a snapshot with "lttng snapshot record" > consumerd crashed! See below for debug output from sessiond. Seems like a bug > to me, something to add to the bugtracker? Yes, please file a new bug entry against the lttng-tools project and join any relevant logs, stack traces or core dumps you may have. Also, include reproduction steps if you can you get it to crash reliably. Regards, Jérémie > > Cheers, > Stanislav > > DEBUG1 [2056/2061]: Sending metadata request to sessiond, session id 0, > per-pid 6 (in lttng_ustconsumer_request_metadata() at ust-consumer.c:1867) > DEBUG1 [1855/2057]: Metadata request received for session 0, key 8 (in > ust_consumer_metadata_request() at ust-consumer.c:455) > DEBUG3 [1855/2057]: Buffer registry per UID find id: 0, ABI: 32, uid: 0 (in > buffer_reg_uid_find() at buffer-registry.c:195) > DEBUG3 [1855/2057]: No metadata to push for metadata key 4 (in > ust_app_push_metadata() at ust-app.c:441) > DEBUG1 [1855/2057]: No metadata to push (in ust_app_push_metadata() at > ust-app.c:444) > DEBUG2 [1855/2057]: Consumer push metadata to consumer socket 33 (in > consumer_push_metadata() at consumer.c:1175) > lttng-consumerd: ust-consumer.c:1907: lttng_ustconsumer_request_metadata: > Assertion `key == channel->key' failed. > DEBUG1 [1855/1858]: Fail to receive status reply on sock 32 (in > consumer_recv_status_reply() at consumer.c:58) > DEBUG1 [1855/1858]: Sending response (size: 16, retcode: Snapshot record > failed) (in thread_manage_clients() at main.c:3765) > DEBUG1 [1855/2057]: Fail to receive status reply on sock 33 (in > consumer_recv_status_reply() at consumer.c:58) > Error: Pushing metadata > Error: Handling metadata request > Error: Health error occurred in thread_manage_consumer > DEBUG1 [1855/2057]: consumer thread cleanup completed (in > thread_manage_consumer() at main.c:1194) > DEBUG1 [1855/1858]: Clean command context structure (in clean_command_ctx() > at main.c:538) > DEBUG1 [1855/1858]: Accepting client command ... (in thread_manage_clients() > at main.c:3629) > > > -----Original Message----- > From: jeremie.galarn...@gmail.com [mailto:jeremie.galarn...@gmail.com] On > Behalf Of Jérémie Galarneau > Sent: den 9 augusti 2013 16:55 > To: Stanislav Vovk > Cc: lttng-dev@lists.lttng.org > Subject: Re: [lttng-dev] one sessiond for multiuser system > > On Fri, Aug 9, 2013 at 4:01 AM, Stanislav Vovk <stanislav.v...@ericsson.com> > wrote: >> Hi, >> >> Have a few questions regarding lttng configuration in a multi user system. >> >> In my system there are two users, root and Bob. I am starting sessiond at >> boot as root user. And instrumented programs are started as either root or >> Bob. I am logged in to the system and controlling lttng as root user. >> >> - When executing "lttng list -u" I see events registered by programs started >> as root. I don't see events from programs started as Bob. Why? Did I forget >> something? >> >> - Now I switch user to Bob in the shell. Executing "lttng list -u" does not >> give any output at all, instead a new sessiond is started. How can I have >> one sessiond for the whole system? > > Hi Stanislav, > > A non-privileged user can only interact with a root session daemon if he is > part of the "tracing" group. Is it the case for "Bob" in this example? > > Reproducing your scenario here with "Bob" being part of the tracing group: > - Root can list its own sessions as well as Bob's > - Bob's user space events can also be seen by root > - Bob can't see the sessions created by root. > > Regards, > Jérémie > >> >> Cheers, >> Stanislav >> >> _______________________________________________ >> lttng-dev mailing list >> lttng-dev@lists.lttng.org >> http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev > > > > -- > Jérémie Galarneau > EfficiOS Inc. > http://www.efficios.com -- Jérémie Galarneau EfficiOS Inc. http://www.efficios.com _______________________________________________ lttng-dev mailing list lttng-dev@lists.lttng.org http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
