[Bug 1862936] Re: Error: Rotation feature not supported by the kernel tracer.

[Mathew Hodson]

** Tags added: regression-release

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Title:
  Error: Rotation feature not supported by the kernel tracer.

Status in ltt-control package in Ubuntu:
  Fix Released
Status in ltt-control source package in Focal:
  Fix Released
Status in ltt-control package in Debian:
  Unknown

Bug description:
  $ dpkg -l | grep ltt
  ii  liblttng-ctl0:amd64                  2.11.1-1                            amd64        LTTng control and utility library
  ii  liblttng-ust-ctl4:amd64              2.11.0-1                            amd64        LTTng 2.0 Userspace Tracer (trace control library)
  ii  lttng-modules-dkms                   2.10.8-1ubuntu2                     all          Linux Trace Toolkit (LTTng) kernel modules (DKMS)
  ii  lttng-tools                          2.11.1-1                            amd64        LTTng control and utility programs

  $ lsb_release -a
  No LSB modules are available.
  Distributor ID: Ubuntu
  Description:    Ubuntu Focal Fossa (development branch)
  Release:        20.04
  Codename:       focal

  How to reproduce:

  $ sudo lttng create foobar
  Session foobar created.
  Traces will be output to /root/lttng-traces/foobar-20200212-123955

  $ sudo lttng enable-event --kernel sched_switch
  Kernel event sched_switch created in channel channel0

  $ sudo lttng start
  Tracing started for session foobar

  $ dd if=/dev/zero bs=4096 count=100000 | cat | cat | cat | dd bs=4096 > /dev/null
  100000+0 records in
  100000+0 records out
  409600000 bytes (410 MB, 391 MiB) copied, 0.664467 s, 616 MB/s
  100000+0 records in
  100000+0 records out
  409600000 bytes (410 MB, 391 MiB) copied, 0.664758 s, 616 MB/s

  $ sudo lttng stop
  Waiting for data availability.
  Tracing stopped for session foobar

  $ sudo lttng destroy
  Error: Rotation feature not supported by the kernel tracer. during the destruction of session "foobar"

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