Ok, I have an idea. content-hub links to libubuntu-app-launch.so, which links to liblttng-ust.so. On load of liblttng-ust.so, it registers 2 tracepoint providers by default: ust_baddr_statedump and lttng_ust_tracef. These are causing our repeating error messages.
Instead, I think we need to refactor UAL to dynamically load liblttng-ust.so, instead of linking to it, and dlload it when tracing is desired. See the strangely-named "Dynamic linking" section of the doc: http://www.lttng.org/docs/#doc-building-tracepoint-providers-and-user-application This is what Mir is doing, and works well there. See http://bazaar.launchpad.net/~mir-team/mir/development-branch/view/head:/src/common/report/lttng/tracepoint_provider.cpp ** Changed in: content-hub (Ubuntu) Status: New => Invalid ** Also affects: ubuntu-app-launch (Ubuntu) Importance: Undecided Status: New ** Summary changed: - liblttng-ust0 Error opening shm /lttng-ust-wait-5 + liblttng-ust0 Error opening shm /lttng-ust-wait-5 - do not link liblttng-ust! ** Changed in: platform-api Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to content-hub in Ubuntu. https://bugs.launchpad.net/bugs/1404302 Title: liblttng-ust0 Error opening shm /lttng-ust-wait-5 - do not link liblttng-ust! Status in Client Developer Experience: Confirmed Status in platform-api: Invalid Status in content-hub package in Ubuntu: Invalid Status in qtmir package in Ubuntu: Invalid Status in ubuntu-app-launch package in Ubuntu: New Status in webbrowser-app package in Ubuntu: Confirmed Bug description: Confined apps don't have access to this and continuously produce this error message in stderr: libust[31283/31285]: Error: Error opening shm /lttng-ust-wait-5 (in get_wait_shm() at lttng-ust-comm.c:958) This is printed to the application's log about once every other second and makes it hard to read the application's own debug output. For a better app developer experience this message should be silenced. To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-developer-experience/+bug/1404302/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
