Tests fix: test_callstack: output of addr2line incorrectly parsed

Tests fix: test_callstack: output of addr2line incorrectly parsed

Issue observed
--------------

The test_callstack test fails with GCC 13.1 with the following output:

  Traceback (most recent call last):
  File "/usr/lib/lttng-tools/ptest/tests/regression/././kernel//../../utils/parse-callstack.py", line 160, in <module>
  main()
  File "/usr/lib/lttng-tools/ptest/tests/regression/././kernel//../../utils/parse-callstack.py", line 155, in main
  raise Exception('Expected function name not found in recorded callstack')
  Exception: Expected function name not found in recorded callstack
  ok 10 - Destroy session callstack
  PASS: kernel/test_callstack 10 - Destroy session callstack
  not ok 11 - Validate userspace callstack
  FAIL: kernel/test_callstack 11 - Validate userspace callstack

Cause
-----

parse-callstack.py uses 'split()' to split the lines of addr2line's
output. By default, 'split()' splits a string on any whitespace.
Typically this was fine as addr2line's output doesn't contain spaces and
the function then splits on new lines.

Typical output of addr2line:

  $ addr2line -e ./tests/regression/kernel//../../utils/testapp/gen-syscall-events-callstack/gen-syscall-events-callstack --functions --addresses 0x40124B
  0x000000000040124b
  my_gettid
  /tmp/test-callstack-master/src/lttng-tools/tests/utils/testapp/gen-syscall-events-callstack/gen-syscall-events-callstack.c:40

However, with the test app compiled using gcc 13.1, a "discriminator"
annotation is present:

  0x0000000000401279
  fct_b
  /tmp/test-callstack-master/src/lttng-tools/tests/utils/testapp/gen-syscall-events-callstack/gen-syscall-events-callstack.c:58 (discriminator 1)

Hence, by selecting the second to last element (-2, with negative
indexing), the addr2line function returns '(discriminator' as the
function name.

Solution
--------

The parsing code is changed to simply iterate on groups of 3 lines,
following addr2line's output format.

Fixes #1377

Change-Id: I8c1eab97e84ca7cad171904bed6660540061cf08
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>