[Bug 2032623] Re: [armhf] learning switch - OpenFlow15 test fails due to unexpected debug logging

[Frode Nordahl]

** Changed in: openvswitch (Ubuntu)
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/2032623

Title:
  [armhf] learning switch - OpenFlow15 test fails due to unexpected
  debug logging

Status in openvswitch package in Ubuntu:
  Fix Committed

Bug description:
  Open vSwitch 3.2.0 added the ability to print backtraces in the event
  of a fatal crash.  The commit [0] adding this functionality also added
  debug logging on startup if a call to libc backtrace() does not
  provide any frames.

  On the systems where armhf packages are built and tested this is the
  case and as a consequence the build fails.

  Test log excerpt:
  #                             -*- compilation -*-
  2560. learning-switch.at:7: testing learning switch - OpenFlow15 ...
  ../../tests/learning-switch.at:9: ovs-testcontroller --no-chdir --detach punix:controller --pidfile -v ptcp:
  --- /dev/null	2023-08-22 06:47:35.672268660 +0000
  +++ /tmp/openvswitch-3.2.0/_debian/tests/testsuite.dir/at-groups/2560/stderr	2023-08-22 07:45:45.858016173 +0000
  @@ -0,0 +1 @@
  +2023-08-22T07:45:45Z|00001|fatal_signal|DBG|Capturing of dummy backtrace has failed.
  stdout:
  2560. learning-switch.at:7: 2560. learning switch - OpenFlow15 (learning-switch.at:7): FAILED (learning-switch.at:9)

  Compiling and running this super simple program confirms the behavior in isolation:
  #include <stdio.h>

  #include <execinfo.h>

  #define BACKTRACE_MAX_FRAMES 31

  int
  main(int argc, char **argv)
  {
      int n_frames;
      void *frames[BACKTRACE_MAX_FRAMES];    

      n_frames = backtrace(frames, BACKTRACE_MAX_FRAMES);

      printf("%d/%d", n_frames, BACKTRACE_MAX_FRAMES);
  }

  0:
  https://github.com/openvswitch/ovs/commit/759a29dc2d97bfba9e3c5270a621beca673962ca

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