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

[Frode Nordahl]

Public bug reported:

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

** Affects: openvswitch (Ubuntu)
     Importance: Undecided
         Status: New

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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:
  New

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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