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Thanks for your response. I tried specifying the session > name, but nothing changed. > > Here is the output I get after adding the tracker: > > |Added 1002 to the group ID tracker inclusion set| > > I don’t think the session name is the issue, because I also specified > the session name when starting tracking. This is the session state after > creating it: > > |$ sudo lttng list lttng-gid-test Recording session lttng-gid-test: > [active] Trace output: /tmp/lttng/lttng-gid-test === Domain: Linux > kernel === Tracked process attributes Process IDs: none Virtual process > IDs: none User IDs: none Virtual user IDs: none Group IDs: 1002 Virtual > group IDs: none| > > And these are the logs I get: > > |[11:01:51.222277079] (+0.000004846) dhcp15 ext4_get_inode_loc: { cpu_id > = 3 }, { pid = 403653, tid = 403660, procname = "lttng-consumerd", gid = > 0, uid = 0, vpid = 403653, vuid = 0, vgid = 0 }, { ip = > 0xFFFFFFFFAC804940 } ...| > > There are many logs like this from systemd, kworker, and processes > belonging to other groups. Note that the GID 1002 that I want to trace > currently has no active subjects. > > Do you suggest switching to the recent version of LTTng (current version > 2.13.11)? > I just tested with stable-2.13 and stable-2.14. I was able to reproduce the issue you saw in stable-2.13, but not stable-2.14 I recommend updating to 2.14 or later. thanks, kienan > Best, > Amir > > > On Tue, Apr 7, 2026 at 10:57 AM Kienan Stewart > wrote: > > Hi Amir, > > On 2026-04-04 21:02, Amir Najafi Zadeh via lttng-dev wrote: > > Hello all, > > > > I hope you are doing well. > > > > I have a quick question about LTTng tracking when using kernel > probes. I > > mainly use LTTng to trace file system functions in the Linux > kernel, and > > for that I use the LTTng kernel probe feature, which works very > well. > > However, when I tried filtering logs for a specific group ID, I > noticed > > that filters are not supported for kernel probes. > > > > Then I attempted to use the tracking feature to trace only a > specific > > GID, but this also did not work. From what I see in my logs, it > appears > > that for kernel probes all events are captured and recorded, > regardless > > of the tracking options. > > > > I wanted to know if this is a known limitation, and whether there > is any > > in-progress work or reason why this is not currently supported. > > > > I just tried on the master branch (since I had easy access to it), and > wasn't able to reproduce a situation where I added the gid tracking and > had results for a different gid in lttng view. > > > For reference, here is my code. I am using LTTng 2.13.11 with kernel > > 6.8.0-101-generic: > > > > ``` #!/bin/sh > > SESSION_NAME="lttng-gid-test" > > OUTPUT_DIR="/tmp/lttng/${SESSION_NAME}" > > GROUP_ID=1002 > > > > # create the lttng session > > lttng create "$SESSION_NAME" -o "$OUTPUT_DIR" > > > > # create the lttng ring buffer channel > > lttng enable-channel --session="$SESSION_NAME" --kernel channel0 \ > > --subbuf-size=16M \ > > --num-subbuf=2 > > > > # add pid, tid, proc, and gid for tracing collection > > lttng add-context --session="$SESSION_NAME" --channel=channel0 -- > kernel > > --type pid > > lttng add-context --session="$SESSION_NAME" --channel=channel0 -- > kernel > > --type gid > > > > # enable the target probe > > lttng enable-event --session="$SESSION_NAME" --channel=channel0 > --kernel > > --probe=ext4_get_inode_loc ext4_get_inode_loc > > > > # disable all tracks # NOTE: untracking doesn't make a difference > > # lttng untrack --session="$SESSION_NAME" --kernel --all --gid > > # lttng untrack --session="$SESSION_NAME" --kernel --all --pid > > # lttng untrack --session="$SESSION_NAME" --kernel --all --vpid > > # lttng untrack --session="$SESSION_NAME" --kernel --all --uid > > # lttng untrack --session="$SESSION_NAME" --kernel --all --vuid > > # lttng untrack --session="$SESSION_NAME" --kernel --all --vgid > > # only enable gid 1002 track > > lttng track --kernel --gid=1002 > > > > Could you check the output of your script after "lttng track --kernel > --gid=1002"? > > The rest of your commands specify a session name, but this one does > not. > I wonder if  it's selecting a different default session that the one > you're expecting? > > > # start lttng lttng start $SESSION_NAME > > > > ``` > > > > Thank you for your time and guidance. > > > > Best regards, > > Amir > > > > -- > > *Amirhossein Najafizadeh* > > *PhD Student, Computer Science Department, Stony Brook > University, N.Y. > > File systems and Storage Lab (FSL) > > > > * > > najafizadeh21@gmail.com > > > > https://amirhnajafiz.github.io/ > > >