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Thu, 05 Jun 2025 03:49:38 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: Date: Thu, 5 Jun 2025 11:49:26 +0100 X-Gm-Features: AX0GCFt2oSQBQmNqb_-XpKtO664urPqprdGdhFGktHNj7fkPb9tqKYunbNZFJI4 Message-ID: Subject: Re: Function tracing not working To: Mathieu Desnoyers Cc: lttng-dev@lists.lttng.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-BeenThere: lttng-dev@lists.lttng.org X-Mailman-Version: 2.1.39 Precedence: list List-Id: LTTng development list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: David Aldrich via lttng-dev Reply-To: David Aldrich Errors-To: lttng-dev-bounces@lists.lttng.org Sender: "lttng-dev" Hi Mathieu I'd like to add some more detail. I now run our app using this pattern: LD_PRELOAD=3Dliblttng-ust-cyg-profile.so ./app On importing the trace into TraceCompass I see: "null analysis for LTTng-UST CallStack" Could the reason be the lttng commands I am using to capture UST and Kernel events: lttng enable-event --userspace 'lttng_ust_tracef:*' lttng enable-channel --kernel --session app_trace kernel_channel lttng enable-event --kernel --all --channel kernel_channel --session app_tr= ace Best regards David On Wed, Jun 4, 2025 at 5:22=E2=80=AFPM David Aldrich wrote: > > Hi Mathieu > > > > Any idea what I am doing wrong please? > > > > AFAIK, the "LD_PRELOAD" environment variable is cleared by > > sudo when running its child process for security purposes. > > Thanks for your answer, that does help. However, I have now adjusted > the code so that sudo is not required, but when I import the trace the > UST-CallStacks are still strikethrough. > > Any thoughts why this is happening? > > I don't see any runtime errors whether or not I specify the prefix: > > LD_PRELOAD=3Dliblttng-ust-cyg-profile.so > > Is that expected? > > Best regards, David