* [lttng-dev] Assertion tgt_fc failed when trying to trace callstack-user @ 2021-08-01 9:11 Evan Galea via lttng-dev 2021-08-02 12:56 ` Francis Deslauriers via lttng-dev 0 siblings, 1 reply; 3+ messages in thread From: Evan Galea via lttng-dev @ 2021-08-01 9:11 UTC (permalink / raw) To: lttng-dev [-- Attachment #1.1: Type: text/plain, Size: 1114 bytes --] Hi there Thanks for help on my previous issue. I was able to get callstack-user to work and see it in my traces. However, in order to get it to run I needed to enable-event --kernel all. Is it necessary to have all kernel events enabled to run callstack-user? Or is it just one specific event? When I try to run it without enabling all kernel events the command is accepted and it runs but I get the following error when trying to view my traces: (╯°□°)╯︵ ┻━┻ ctf-meta-update-value-storing-indexes.c:65: update_field_class_stored_value_index(): Assertion `tgt_fc` failed. Aborted (core dumped) What does this error mean? Should I just continue to enable all kernel events? My current command setup, not sure if relevant lttng create && lttng enable-channel mychannel --subbuf-size 100000000 lttng enable-event --kernel --all && lttng add-context -u -t vpid -t vtid -t procname && lttng add-context --kernel --type callstack-user && lttng add-context --kernel --type callstack-kernel && lttng enable-event --jul jello again thank you for your time Evan Galea [-- Attachment #1.2: Type: text/html, Size: 3589 bytes --] [-- Attachment #2: Type: text/plain, Size: 156 bytes --] _______________________________________________ lttng-dev mailing list lttng-dev@lists.lttng.org https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [lttng-dev] Assertion tgt_fc failed when trying to trace callstack-user 2021-08-01 9:11 [lttng-dev] Assertion tgt_fc failed when trying to trace callstack-user Evan Galea via lttng-dev @ 2021-08-02 12:56 ` Francis Deslauriers via lttng-dev [not found] ` <CAA+-46qpk52j9B56wpvsJ=WvE-TX_83r+A6o7hqTxGeTLLS8cQ@mail.gmail.com> 0 siblings, 1 reply; 3+ messages in thread From: Francis Deslauriers via lttng-dev @ 2021-08-02 12:56 UTC (permalink / raw) To: Evan Galea, lttng-dev [-- Attachment #1.1: Type: text/plain, Size: 1901 bytes --] Hi Evan, On 8/1/21 5:11 AM, Evan Galea via lttng-dev wrote: > Hi there > > Thanks for help on my previous issue. I was able to get > callstack-user to work and see it in my traces. However, in order to > get it to run I needed to enable-event --kernel all. Is it necessary > to have all kernel events enabled to run callstack-user? Or is it just > one specific event? > > When I try to run it without enabling all kernel events the command is > accepted and it runs but I get the following error when trying to view > my traces: > > (╯°□°)╯︵ ┻━┻ ctf-meta-update-value-storing-indexes.c:65: > update_field_class_stored_value_index(): Assertion `tgt_fc` failed. > Aborted (core dumped) > > What does this error mean? Should I just continue to enable all kernel > events? It's a Babeltrace 2 error. Now, we need to find out if the root cause is the LTTng kernel tracer or Babeltrace2 itself. What is the "one specific event" you're enabling that seems to cause this issue? Do you have access to a Babeltrace 1.5 build? if so, could you try to read that same trace using it? Could you please share a small trace reproducing this issue? What version of LTTng-tools, LTTng-Modules, and Babeltrace2 are you using? Cheers, Francis > > My current command setup, not sure if relevant > > lttng create && > lttng enable-channel mychannel --subbuf-size 100000000 > lttng enable-event --kernel --all && > lttng add-context -u -t vpid -t vtid -t procname && > lttng add-context --kernel --type callstack-user && > lttng add-context --kernel --type callstack-kernel && > lttng enable-event --jul jello > > again thank you for your time > > Evan Galea > > _______________________________________________ > lttng-dev mailing list > lttng-dev@lists.lttng.org > https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev [-- Attachment #1.2: Type: text/html, Size: 6314 bytes --] [-- Attachment #2: Type: text/plain, Size: 156 bytes --] _______________________________________________ lttng-dev mailing list lttng-dev@lists.lttng.org https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev ^ permalink raw reply [flat|nested] 3+ messages in thread
[parent not found: <CAA+-46qpk52j9B56wpvsJ=WvE-TX_83r+A6o7hqTxGeTLLS8cQ@mail.gmail.com>]
* Re: [lttng-dev] Assertion tgt_fc failed when trying to trace callstack-user [not found] ` <CAA+-46qpk52j9B56wpvsJ=WvE-TX_83r+A6o7hqTxGeTLLS8cQ@mail.gmail.com> @ 2021-08-05 21:07 ` Francis Deslauriers via lttng-dev 0 siblings, 0 replies; 3+ messages in thread From: Francis Deslauriers via lttng-dev @ 2021-08-05 21:07 UTC (permalink / raw) To: Evan Galea; +Cc: lttng-dev [-- Attachment #1.1: Type: text/plain, Size: 2931 bytes --] Hi Evan, It turns out it's a Babeltrace 2 bug. Here the fix: https://review.lttng.org/c/babeltrace/+/6257. It should be merged into the master and stable-2.0 branches soon. Thank you for reporting the issue, Francis On 8/4/21 3:55 AM, Evan Galea wrote: > Hi Francis, thanks for your reply. As it turns out, running babeltrace > on the file worked and I'm able to read the traces. I am running > babeltrace 1.5.8, lttng 2.12.4, lttng-tools 2.12.x stable, and lttng > modules 5.8.0-63. I attached the trace of the file. > > > On Mon, Aug 2, 2021 at 8:56 AM Francis Deslauriers > <francis.deslauriers@efficios.com > <mailto:francis.deslauriers@efficios.com>> wrote: > > Hi Evan, > > On 8/1/21 5:11 AM, Evan Galea via lttng-dev wrote: >> Hi there >> >> Thanks for help on my previous issue. I was able to get >> callstack-user to work and see it in my traces. However, in order >> to get it to run I needed to enable-event --kernel all. Is it >> necessary to have all kernel events enabled to run >> callstack-user? Or is it just one specific event? >> >> When I try to run it without enabling all kernel events the >> command is accepted and it runs but I get the following error >> when trying to view my traces: >> >> (╯°□°)╯︵ ┻━┻ ctf-meta-update-value-storing-indexes.c:65: >> update_field_class_stored_value_index(): Assertion `tgt_fc` failed. >> Aborted (core dumped) >> >> What does this error mean? Should I just continue to enable all >> kernel events? > > It's a Babeltrace 2 error. Now, we need to find out if the root > cause is the LTTng kernel tracer or Babeltrace2 itself. > > What is the "one specific event" you're enabling that seems to > cause this issue? > > Do you have access to a Babeltrace 1.5 build? if so, could you try > to read that same trace using it? > > Could you please share a small trace reproducing this issue? > > What version of LTTng-tools, LTTng-Modules, and Babeltrace2 are > you using? > > > Cheers, > > Francis > >> >> My current command setup, not sure if relevant >> >> lttng create && >> lttng enable-channel mychannel --subbuf-size 100000000 >> lttng enable-event --kernel --all && >> lttng add-context -u -t vpid -t vtid -t procname && >> lttng add-context --kernel --type callstack-user && >> lttng add-context --kernel --type callstack-kernel && >> lttng enable-event --jul jello >> >> again thank you for your time >> >> Evan Galea >> >> _______________________________________________ >> lttng-dev mailing list >> lttng-dev@lists.lttng.org <mailto:lttng-dev@lists.lttng.org> >> https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev <https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev> > [-- Attachment #1.2: Type: text/html, Size: 5855 bytes --] [-- Attachment #2: Type: text/plain, Size: 156 bytes --] _______________________________________________ lttng-dev mailing list lttng-dev@lists.lttng.org https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev ^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-08-01 9:11 [lttng-dev] Assertion tgt_fc failed when trying to trace callstack-user Evan Galea via lttng-dev
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