Hex and int Kconfig options are supposed to have defaults. This is so we can configure U-Boot without having to enter particular values for the items that don't have specific values in the board's defconfig file.

If this rule is not followed, then introducing a new Kconfig can produce a loop like this:

Break things (BREAK_ME) [] (NEW) Error in reading or end of file.

Break things (BREAK_ME) [] (NEW) Error in reading or end of file.

The continues forever since buildman passes /dev/null to 'conf', and the build system just tries again. Eventually there is so much output that buildman runs out of memory.

We can detect this situation by looking for a symbol (like 'BREAK_ME') which has no default (the '[]' above) and is marked as new. If this appears multiple times in the output, we know something is wrong.

Add a filter function for the output which detects this situation. Allow it to return True to terminate the process. Implement this termination in cros_subprocess.

With this we get a nice message:

buildman --board sandbox -T0 Building current source for 1 boards (0 threads, 32 jobs per thread) sandbox: w+ sandbox +.config:66:warning: symbol value '' invalid for BREAK_ME + +Error in reading or end of file. +make[3]: *** [scripts/kconfig/Makefile:75: syncconfig] Terminated +make[2]: *** [Makefile:569: syncconfig] Terminated +make: *** [Makefile:177: sub-make] Terminated +(** did you define an int/hex Kconfig with no default? **)

Signed-off-by: Simon Glass sjg@chromium.org ---

tools/buildman/builder.py | 43 ++++++++++++++++++++++++++++++++- tools/patman/command.py | 7 ++++-- tools/patman/cros_subprocess.py | 10 ++++++-- 3 files changed, 55 insertions(+), 5 deletions(-)

diff --git a/tools/buildman/builder.py b/tools/buildman/builder.py index ce852eb03a3..122f0d14065 100644 --- a/tools/buildman/builder.py +++ b/tools/buildman/builder.py @@ -24,6 +24,17 @@ from patman import gitutil from patman import terminal from patman.terminal import Print

+# This indicates an new int or hex Kconfig property with no default +# It hangs the build since the 'conf' tool cannot proceed without valid input. +# +# We get a repeat sequence of something like this: +# >> +# Break things (BREAK_ME) [] (NEW) +# Error in reading or end of file. +# << +# which indicates that BREAK_ME has an empty default +RE_NO_DEFAULT = re.compile(b'((\w+)) [] (NEW)') + """ Theory of Operation

@@ -200,6 +211,8 @@ class Builder: _working_dir: Base working directory containing all threads _single_builder: BuilderThread object for the singer builder, if threading is not being used + _terminated: Thread was terminated due to an error + _restarting_config: True if 'Restart config' is detected in output """ class Outcome: """Records a build outcome for a single make invocation @@ -304,6 +317,8 @@ class Builder: self.work_in_output = work_in_output if not self.squash_config_y: self.config_filenames += EXTRA_CONFIG_FILENAMES + self._terminated = False + self._restarting_config = False

self.warnings_as_errors = warnings_as_errors self.col = terminal.Color() @@ -429,9 +444,35 @@ class Builder: args: Arguments to pass to make kwargs: Arguments to pass to command.RunPipe() """ + + def check_output(stream, data): + if b'Restart config' in data: + self._restarting_config = True + + # If we see 'Restart config' following by multiple errors + if self._restarting_config: + m = RE_NO_DEFAULT.findall(data) + + # Number of occurences of each Kconfig item + multiple = [m.count(val) for val in set(m)] + + # If any of them occur more than once, we have a loop + if [val for val in multiple if val > 1]: + self._terminated = True + return True + return False + + self._restarting_config = False + self._terminated = False cmd = [self.gnu_make] + list(args) result = command.RunPipe([cmd], capture=True, capture_stderr=True, - cwd=cwd, raise_on_error=False, infile='/dev/null', **kwargs) + cwd=cwd, raise_on_error=False, infile='/dev/null', + output_func=check_output, **kwargs) + + if self._terminated: + # Try to be helpful + result.stderr += '(** did you define an int/hex Kconfig with no default? **)' + if self.verbose_build: result.stdout = '%s\n' % (' '.join(cmd)) + result.stdout result.combined = '%s\n' % (' '.join(cmd)) + result.combined diff --git a/tools/patman/command.py b/tools/patman/command.py index bf8ea6c8c3c..d54b1e0efce 100644 --- a/tools/patman/command.py +++ b/tools/patman/command.py @@ -49,7 +49,8 @@ test_result = None

def RunPipe(pipe_list, infile=None, outfile=None, capture=False, capture_stderr=False, oneline=False, - raise_on_error=True, cwd=None, binary=False, **kwargs): + raise_on_error=True, cwd=None, binary=False, + output_func=None, **kwargs): """ Perform a command pipeline, with optional input/output filenames.

@@ -63,6 +64,8 @@ def RunPipe(pipe_list, infile=None, outfile=None, capture: True to capture output capture_stderr: True to capture stderr oneline: True to strip newline chars from output + output_func: Output function to call with each output fragment + (if it returns True the function terminates) kwargs: Additional keyword arguments to cros_subprocess.Popen() Returns: CommandResult object @@ -105,7 +108,7 @@ def RunPipe(pipe_list, infile=None, outfile=None,

if capture: result.stdout, result.stderr, result.combined = ( - last_pipe.CommunicateFilter(None)) + last_pipe.CommunicateFilter(output_func)) if result.stdout and oneline: result.output = result.stdout.rstrip(b'\r\n') result.return_code = last_pipe.wait() diff --git a/tools/patman/cros_subprocess.py b/tools/patman/cros_subprocess.py index fdd51386856..88a4693feff 100644 --- a/tools/patman/cros_subprocess.py +++ b/tools/patman/cros_subprocess.py @@ -128,6 +128,9 @@ class Popen(subprocess.Popen): sys.stdout or sys.stderr. data: a string containing the data

+ Returns: + True to terminate the process + Note: The data read is buffered in memory, so do not use this method if the data size is large or unlimited.

@@ -175,6 +178,7 @@ class Popen(subprocess.Popen): stderr = bytearray() combined = bytearray()

+ stop_now = False input_offset = 0 while read_set or write_set: try: @@ -212,7 +216,7 @@ class Popen(subprocess.Popen): stdout += data combined += data if output: - output(sys.stdout, data) + stop_now = output(sys.stdout, data) if self.stderr in rlist: data = b'' # We will get an error on read if the pty is closed @@ -227,7 +231,9 @@ class Popen(subprocess.Popen): stderr += data combined += data if output: - output(sys.stderr, data) + stop_now = output(sys.stderr, data) + if stop_now: + self.terminate()

# All data exchanged. Translate lists into strings. stdout = self.ConvertData(stdout)