[lttng-dev] loglevel: <<UNKNOWN>>

[Thibault, Daniel]

   Something strange is going on in one of my virtual machines.  I was fooling around with defining events, creating and deleting sessions, etc., and now the list of kernel tracepoints (lttng list -k) contains several entries where the loglevel reads a corrupt value.  Specifically:

      skb_consume (loglevel: <<UNKNOWN>> (577)) (type:tracepoint)
      skb_copy_datagram_iovec (loglevel: <<UNKNOWN>> (1140980544)) (type:tracepoint)
      sched_switch (loglevel: <<UNKNOWN>> (6647407)) (type:tracepoint)
      sched_migrate_task (loglevel: <<UNKNOWN>> (1140883008)) (type:tracepoint)
      sched_process_free (loglevel: <<UNKNOWN>> (51088)) (type:tracepoint)
      regulator_enable (loglevel: <<UNKNOWN>> (1140998064)) (type:tracepoint)
      regulator_enable_delay (loglevel: <<UNKNOWN>> (1140998080)) (type:tracepoint)
      power_machine_suspend (loglevel: <<UNKNOWN>> (52)) (type:tracepoint)

   None of these events were the subject of kprobe or kretprobe events, except maybe sched_switch.

   This weirdness went away after a restart of lttng-sessiond.  I've saved the VM with this corrupt system in case anyone wants to investigate.

Daniel U. Thibault
Protection des systèmes et contremesures (PSC) | Systems Protection & Countermeasures (SPC)
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