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charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Felix, There was indeed a bug in how CTF trace index is parsed in Trace Compass. I= created a fix in https://github.com/eclipse-tracecompass/org.eclipse.trace= compass/pull/427 If you find another issue in Trace Compass, you can file a bug here instead= : https://github.com/eclipse-tracecompass/org.eclipse.tracecompass/issues Thank you, Arnaud Fiorini ________________________________ From: MOESSBAUER, Felix via lttng-dev Sent: Wednesday, August 5, 2026 6:16 AM To: MOESSBAUER, Felix via lttng-dev Subject: babeltrace master: trace-compass is unable to open trace with inde= x Hi, the babeltrace version from the master branch (65fb4669f) is able to create LTTng index files. However, these index files seem to be incompatible with trace-compass. On loading such a trace, trace-compass (incubator version, 0.18.0- 20260711-0558, or release 12.0.0) issues the following error message: > Error initializing trace. > org.eclipse.tracecompass.tmf.core.exceptions.TmfTraceException: > Failed to allocate mapped byte buffer at 36 of size 416 on a > file of size 176 I double checked the traces with babeltrace and https://github.com/eepp/jacquesctf , which are both able to properly read the traces. For reproducing, run the tests/plugins/sink.ctf.fs/test_create_lttng_index.py test and open any of the generated CTF files in trace-compass. I explicitly tested and reproduced it with "with-packets-ctf-2" and "no-packets-ctf-2". The traces itself are valid, which can be proved by removing the index file and successfully re-opening them in trace-compass. PS: I'm pretty sure this is a trace-compass bug, but as I'm not a member of the tracecompass-dev ML, I report it here. Feel free to forward. Best regards, Felix Moessbauer -- Siemens AG Linux Expert Center Friedrich-Ludwig-Bauer-Str. 3 85748 Garching, Germany --_000_YQBPR0101MB9838D35D912444AEB1C71531E9D32YQBPR0101MB9838_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
Hi Felix,

There was indeed a bug in how CTF trace index is parsed in Trace Compass. I= created a fix in https://github.com/eclipse-tracecompass/org.eclipse.tracecompass/pull/427

If you find another issue in Trace Compass, you can file a bug here instead= : https://github.com/eclipse-tracecompass/org.eclipse.tracecompass/issues=

Thank you,
Arnaud Fiorini

From: MOESSBAUER, Felix via= lttng-dev <lttng-dev@lists.lttng.org>
Sent: Wednesday, August 5, 2026 6:16 AM
To: MOESSBAUER, Felix via lttng-dev <lttng-dev@lists.lttng.org>= ;
Subject: babeltrace master: trace-compass is unable to open trace wi= th index
 
Hi,

the babeltrace version from the master branch (65fb4669f) is able to
create LTTng index files. However, these index files seem to be
incompatible with trace-compass.

On loading such a trace, trace-compass (incubator version, 0.18.0-
20260711-0558, or release 12.0.0) issues the following error message:

> Error initializing trace.
> org.eclipse.tracecompass.tmf.core.exceptions.TmfTraceException:
> Failed to allocate mapped byte buffer at 36 of size 416 on a
> file of size 176

I double checked the traces with babeltrace and
https://github.com/eepp/jacq= uesctf , which are both able to properly
read the traces.

For reproducing, run the
tests/plugins/sink.ctf.fs/test_create_lttng_index.py test and open any
of the generated CTF files in trace-compass. I explicitly tested and
reproduced it with "with-packets-ctf-2" and "no-packets-ctf-= 2".

The traces itself are valid, which can be proved by removing the index
file and successfully re-opening them in trace-compass.

PS: I'm pretty sure this is a trace-compass bug, but as I'm not a
member of the tracecompass-dev ML, I report it here. Feel free to
forward.

Best regards,
Felix Moessbauer

--
Siemens AG
Linux Expert Center
Friedrich-Ludwig-Bauer-Str. 3
85748 Garching, Germany

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