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I now run our app using this pattern: > > LD_PRELOAD=liblttng-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_trace Indeed, You will also need to enable something like this: lttng enable-event --userspace 'lttng_ust_cyg_profile:*' See "man 3 lttng-ust-cyg-profile" for details. Thanks, Mathieu > > Best regards > David > > On Wed, Jun 4, 2025 at 5:22 PM 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=liblttng-ust-cyg-profile.so >> >> Is that expected? >> >> Best regards, David -- Mathieu Desnoyers EfficiOS Inc. https://www.efficios.com