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20:55:08.000000000","tz":-240},"committer":{"name":"Jérémie Galarneau","email":"jeremie.galarneau@efficios.com","date":"2024-03-25 14:19:46.000000000","tz":-240},"subject":"Fix: consumerd: leak of tracing buffers on relayd connectivity issue","message":"Fix: consumerd: leak of tracing buffers on relayd connectivity issue\n\nObserved issue\n\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\n\nA leak of the tracing buffers can be noticed when the relay daemon is\nterminated following the creation of a live session, but prior to the\ninitiation of any applications.\n\nThe issue can be reproduced with the following steps:\n  # Create a live session\n  $ lttng create --live\n\n  # Kill the relay daemon before the allocation of the buffers\n  $ killall lttng-relayd\n  $ lttng enable-event --userspace --all\n  $ lttng start\n\n  # Launch an instrumented application\n  $ ./my_app\n\n  # Destroy all sessions\n  $ lttng destroy --all\n\n  # List the open file descriptors of the lttng-consumerd process\n  # and notice how the tracing buffer are still visible.\n  $ ls -lah /proc/$pid_of_lttng_consumerd/fd\n\n[...]\nlrwx------ 1 root root   64 Mar 19 19:50 987 -\u003e \u0027/dev/shm/shm-ust-consumer-358446 (deleted)\u0027\nlrwx------ 1 root root   64 Mar 19 19:50 988 -\u003e \u0027/dev/shm/shm-ust-consumer-358446 (deleted)\u0027\nlrwx------ 1 root root   64 Mar 19 19:50 989 -\u003e \u0027/dev/shm/shm-ust-consumer-358446 (deleted)\u0027\n[...]\n\nCause\n\u003d\u003d\u003d\u003d\u003d\n\nThe consumer daemon allocates recording channels and their tracing\nbuffers in a two-step process.\n\nFirst, the session daemon emits an `ASK_CHANNEL_CREATION` command, which\nresults in the allocation of the internal consumer channel structures\nand of the actual tracing buffers. The channel\u0027s unique key is returned\nto the session daemon.\n\nAfter this command, the channel temporarily holds a list of streams\nwhich are waiting to be sent to the session and relay daemons as a\nresult of the `GET_CHANNEL` command.\n\nAt this moment, the channel\u0027s reference count is one over the number of\nstreams as they all hold a back-reference to their parent channel and\nthere is a global reference held by the session daemon.\n\nThe session daemon uses the key it received to emit the `GET_CHANNEL`\ncommand. When executing this command, the consumer daemon attempts to\nsend the streams to the relay daemon.\n\nOn failure to do so, the session daemon is informed of the connection\nerror. The consumer daemon then omits a step of the command: the streams\nare never handed-off from the channel\u0027s internal list to the\nconsumption/monitoring thread. This hand-off is what is internally\nreferred-to as making the streams \"globally visible\".\n\nThe session daemon, upon receiving the failure error code of the\nGET_CHANNEL command, tears down its internal ust_app channel structures.\nAs part of that process, it emits the `DESTROY_CHANNEL` command to\nreclaim the channel on the consumer daemon\u0027s end. This command is\ndeferred to the channel poll thread as the `CHANNEL_DEL`\ninternal command.\n\nAs part of this internal command, the channel poll thread cleans the\nchannel\u0027s stream list to clean-up any streams that are not \"globally\nvisible\": all of them, in our case.\n\nThen, the session daemon\u0027s global reference is released which should\nnormally result in the reclamation of the channel itself.\n\nWhile reproducing the problem, we noted that channel wasn\u0027t reclaimed\nand that its reference count matched the number of CPUs on the system at\nthe time the `CHANNEL_DEL` command completed.\n\nThis hinted at the streams holding a reference to the channel even after\nthe completion of the reclamation command.\n\nLooking at clean_channel_stream_list(), which cleans up the channel\u0027s\ntemporary stream list, we note that the streams\u0027 monitor property is\noverridden to `false` just before the call to consumer_stream_destroy().\n\nThis is strange and a comment (added as part of 212d67a2 in 2014) hints\nat a locking problem that was being worked-around. In all likelihood,\nthis no longer applies as the locking strategies used have evolved quite\na bit since then.\n\nStill, setting the monitor property to `false` is problematic as, in\nthat mode (say, channels that are used to record a snapshot), streams do\nnot hold a reference to their parent channel. This causes the clean-up\ncode to forego the clean-up of the channel, resulting in its leak.\n\nSince the channel ultimately owns the \u0027stream_fds\u0027 which represent the\nshared memory files, those files (and associated memory) are also leaked\n(they are closed during the execution of lttng_ustconsumer_del_channel()).\n\nSolution\n\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\n\nWe simply remove the stream monitor mode override to leave it in its\nappropriate state. The clean-up then proceeds normally, ensuring the\ntracing buffers are properly reclaimed.\n\nKnown drawbacks\n\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\n\nNone.\n\nFixes #1411\n\nSigned-off-by: Jérémie Galarneau \u003cjeremie.galarneau@efficios.com\u003e\nChange-Id: I4a2fb8cddd2f9da9a2c9df19ba36229627ad2569\n","web_links":[{"name":"gitweb","tooltip":"Open in GitWeb","url":"/gitweb?p\u003dlttng-tools.git;a\u003dcommit;h\u003dba477ceaa6c304fcff1134f21bcead1b1cf99b6c"}],"resolve_conflicts_web_links":[{"name":"gitweb","tooltip":"Open in GitWeb","url":"/gitweb?p\u003dlttng-tools.git;a\u003dcommit;h\u003dba477ceaa6c304fcff1134f21bcead1b1cf99b6c"}]},"parents_data":[{"branch_name":"refs/heads/stable-2.13","commit_id":"283c6fa6cc573166ec4e41b70a9db57f8356f4aa","is_merged_in_target_branch":true,"change_id":"Iff46f87c7725d25c131a86ac3dbaed5c99b4d16b","change_number":10486,"patch_set_number":3,"change_status":"MERGED"}],"branch":"refs/heads/stable-2.13"}},"requirements":[],"submit_records":[],"submit_requirements":[]}