ubuntu-apps-bugs team mailing list archive

[Gerry Boland <1404302@xxxxxxxxxxxxxxxxxx>]

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

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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.

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