# Buggy code
def read(self):
    # Read in the crontab from the system
    self.lines = []
    if self.cron_file:
        # read the cronfile
        try:
            f = open(self.cron_file, "r")
            self.existing = f.read()
            self.lines = self.existing.splitlines()
            f.close()
        except IOError:
            # cron file does not exist
            return
        except Exception:
            raise CronTabError("Unexpected error:", sys.exc_info()[0])
    else:
        # using safely quoted shell for now, but this really should be two non-shell calls instead.  FIXME
        (rc, out, err) = self.module.run_command(
            self._read_user_execute(), use_unsafe_shell=True
        )

        if rc != 0 and rc != 1:  # 1 can mean that there are no jobs.
            raise CronTabError("Unable to read crontab")

        self.existing = out

        lines = out.splitlines()
        count = 0
        for l in lines:
            if count > 2 or (
                not re.match(
                    r"# DO NOT EDIT THIS FILE - edit the master and reinstall.", l
                )
                and not re.match(r"# \(/tmp/.*installed on.*\)", l)
                and not re.match(r"# \(.*version.*\)", l)
            ):
                self.lines.append(l)
            else:
                pattern = re.escape(l) + "[\r\n]?"
                self.existing = re.sub(pattern, "", self.existing, 1)
            count += 1


# Traceback (UnicodeDecodeError)
The full traceback is:
Traceback (most recent call last):
File "/tmp/ansible_cron_payload_0y8i2pgj/ansible_cron_payload.zip/ansible/modules/system/cron.py", line 257, in read
File "/usr/lib/python3.6/encodings/ascii.py", line 26, in decode
return codecs.ascii_decode(input, self.errors)[0]
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 11: ordinal not in range(128)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/root/.ansible/tmp/ansible-tmp-1589383434.7764497-217077099734091/AnsiballZ_cron.py", line 102, in <module>
_ansiballz_main()
File "/root/.ansible/tmp/ansible-tmp-1589383434.7764497-217077099734091/AnsiballZ_cron.py", line 94, in _ansiballz_main
invoke_module(zipped_mod, temp_path, ANSIBALLZ_PARAMS)
File "/root/.ansible/tmp/ansible-tmp-1589383434.7764497-217077099734091/AnsiballZ_cron.py", line 40, in invoke_module
runpy.run_module(mod_name='ansible.modules.system.cron', init_globals=None, run_name='__main__', alter_sys=True)
File "/usr/lib/python3.6/runpy.py", line 205, in run_module
return _run_module_code(code, init_globals, run_name, mod_spec)
File "/usr/lib/python3.6/runpy.py", line 96, in _run_module_code
mod_name, mod_spec, pkg_name, script_name)
File "/usr/lib/python3.6/runpy.py", line 85, in _run_code
exec(code, run_globals)
File "/tmp/ansible_cron_payload_0y8i2pgj/ansible_cron_payload.zip/ansible/modules/system/cron.py", line 770, in <module>
File "/tmp/ansible_cron_payload_0y8i2pgj/ansible_cron_payload.zip/ansible/modules/system/cron.py", line 617, in main
File "/tmp/ansible_cron_payload_0y8i2pgj/ansible_cron_payload.zip/ansible/modules/system/cron.py", line 248, in __init__
File "/tmp/ansible_cron_payload_0y8i2pgj/ansible_cron_payload.zip/ansible/modules/system/cron.py", line 264, in read
__main__.CronTabError: ('Unexpected error:', <class 'UnicodeDecodeError'>)
failed: [cco-web-uat] (item={'name': 'run-all-tasks', 'path': '/scripts/run-all-tasks.php'}) => {
"ansible_loop_var": "cron_task",
"changed": false,
"cron_task": {
"name": "run-all-tasks",
"path": "/scripts/run-all-tasks.php"
},
"module_stderr": "Shared connection to server.fr closed.\r\n",
"module_stdout": "Traceback (most recent call last):\r\n  File \"/tmp/ansible_cron_payload_0y8i2pgj/ansible_cron_payload.zip/ansible/modules/system/cron.py\", line 257, in read\r\n  File \"/usr/lib/python3.6/encodings/ascii.py\", line 26, in decode\r\n    return codecs.ascii_decode(input, self.errors)[0]\r\nUnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 11: ordinal not in range(128)\r\n\r\nDuring handling of the above exception, another exception occurred:\r\n\r\nTraceback (most recent call last):\r\n  File \"/root/.ansible/tmp/ansible-tmp-1589383434.7764497-217077099734091/AnsiballZ_cron.py\", line 102, in <module>\r\n    _ansiballz_main()\r\n  File \"/root/.ansible/tmp/ansible-tmp-1589383434.7764497-217077099734091/AnsiballZ_cron.py\", line 94, in _ansiballz_main\r\n    invoke_module(zipped_mod, temp_path, ANSIBALLZ_PARAMS)\r\n  File \"/root/.ansible/tmp/ansible-tmp-1589383434.7764497-217077099734091/AnsiballZ_cron.py\", line 40, in invoke_module\r\n    runpy.run_module(mod_name='ansible.modules.system.cron', init_globals=None, run_name='__main__', alter_sys=True)\r\n  File \"/usr/lib/python3.6/runpy.py\", line 205, in run_module\r\n    return _run_module_code(code, init_globals, run_name, mod_spec)\r\n  File \"/usr/lib/python3.6/runpy.py\", line 96, in _run_module_code\r\n    mod_name, mod_spec, pkg_name, script_name)\r\n  File \"/usr/lib/python3.6/runpy.py\", line 85, in _run_code\r\n    exec(code, run_globals)\r\n  File \"/tmp/ansible_cron_payload_0y8i2pgj/ansible_cron_payload.zip/ansible/modules/system/cron.py\", line 770, in <module>\r\n  File \"/tmp/ansible_cron_payload_0y8i2pgj/ansible_cron_payload.zip/ansible/modules/system/cron.py\", line 617, in main\r\n  File \"/tmp/ansible_cron_payload_0y8i2pgj/ansible_cron_payload.zip/ansible/modules/system/cron.py\", line 248, in __init__\r\n  File \"/tmp/ansible_cron_payload_0y8i2pgj/ansible_cron_payload.zip/ansible/modules/system/cron.py\", line 264, in read\r\n__main__.CronTabError: ('Unexpected error:', <class 'UnicodeDecodeError'>)\r\n",
"msg": "MODULE FAILURE\nSee stdout/stderr for the exact error",
"rc": 1
}

# Fixed code
def read(self):
    # Read in the crontab from the system
    self.lines = []
    if self.cron_file:
        # read the cronfile
        try:
            f = open(self.b_cron_file, "rb")
            self.n_existing = to_native(f.read(), errors="surrogate_or_strict")
            f.close()
        except IOError:
            # cron file does not exist
            return
        except Exception:
            raise CronTabError("Unexpected error:", sys.exc_info()[0])
    else:
        # using safely quoted shell for now, but this really should be two non-shell calls instead.  FIXME
        (rc, out, err) = self.module.run_command(
            self._read_user_execute(), use_unsafe_shell=True
        )

        if rc != 0 and rc != 1:  # 1 can mean that there are no jobs.
            raise CronTabError("Unable to read crontab")

        self.n_existing = out

        lines = out.splitlines()
        count = 0
        for l in lines:
            if count > 2 or (
                not re.match(
                    r"# DO NOT EDIT THIS FILE - edit the master and reinstall.", l
                )
                and not re.match(r"# \(/tmp/.*installed on.*\)", l)
                and not re.match(r"# \(.*version.*\)", l)
            ):
                self.lines.append(l)
            else:
                pattern = re.escape(l) + "[\r\n]?"
                self.n_existing = re.sub(pattern, "", self.n_existing, 1)
            count += 1