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Add support for Ruby seg fault traces #94

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Add support for Ruby seg fault traces #94

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f7c3219
Add support for Ruby seg fault traces
stanhu Feb 8, 2022
3843683
Handle C level backtraces without address
stanhu Dec 22, 2022
dedfd01
Adjust Ruby exception parser to handle stripped newlines
stanhu Jan 13, 2023
62637f8
Handle blank lines in Ruby exception
stanhu Jan 20, 2023
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56 changes: 54 additions & 2 deletions lib/fluent/plugin/exception_detector.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,7 @@ module Fluent
Struct.new('Rule', :from_states, :pattern, :to_state)

# Configuration of the state machine that detects exceptions.
module ExceptionDetectorConfig
module ExceptionDetectorConfig # rubocop:disable Metrics/ModuleLength
# Rule for a state transition: if pattern matches go to the given state.
class RuleTarget
attr_accessor :pattern, :to_state
Expand Down Expand Up @@ -106,13 +106,61 @@ def self.supported
rule(:go_frame_2, /^\s/, :go_frame_1)
].freeze

RUBY_RULES = [
RUBY_ERROR_RULES = [
rule(:start_state, /Error \(.*\):$/, :ruby_before_rails_trace),
rule(:ruby_before_rails_trace, /^ $/, :ruby),
rule(:ruby_before_rails_trace, /^[\t ]+.*?\.rb:\d+:in `/, :ruby),
rule(:ruby, /^[\t ]+.*?\.rb:\d+:in `/, :ruby)
].freeze

RUBY_SEGFAULT_RULES = [
rule(:start_state,
/:\d+:\s\[BUG\] Segmentation fault/, :ruby_segfault),
rule(:ruby_segfault, /^ruby\n*/, :ruby_segfault),
rule(:ruby_segfault, /^\n*$/, :ruby_segfault),
rule(:ruby_segfault,
/^-- Control frame information --/, :ruby_control_frames),
rule(:ruby_control_frames, /^c:/, :ruby_control_frames),
rule(:ruby_control_frames, /^\n*$/, :ruby_segfault),
rule([:ruby_segfault, :ruby_control_frames],
/^-- Ruby level backtrace information --/,
:ruby_level_backtrace_frames),
rule(:ruby_level_backtrace_frames, /:\d+:in /,
:ruby_level_backtrace_frames),
rule(:ruby_level_backtrace_frames, /^\n*$/, :ruby_segfault),
rule([:ruby_segfault, :ruby_level_backtrace_frames],
/^-- Machine register context --/, :ruby_machine_registers),
rule(:ruby_machine_registers, /: /, :ruby_machine_registers),
rule(:ruby_machine_registers, /^\n*$/, :ruby_segfault),
rule([:ruby_segfault, :ruby_machine_registers],
/^-- C level backtrace information --/,
:ruby_c_level_backtrace_frames),
rule(:ruby_c_level_backtrace_frames, /\[.*\]/,
:ruby_c_level_backtrace_frames),
rule(:ruby_c_level_backtrace_frames, / .*:\d+$/,
:ruby_c_level_backtrace_frames),
rule(:ruby_c_level_backtrace_frames, /^\n*$/, :ruby_segfault),
rule([:ruby_segfault, :ruby_c_level_backtrace_frames],
/^-- Other runtime information/, :ruby_other_runtime_info),
rule(:ruby_other_runtime_info, /^\n*$/, :ruby_other_runtime_info),
rule(:ruby_other_runtime_info, /^* Loaded script:/, :ruby_loaded_script),
rule(:ruby_loaded_script, /^\n*$/, :ruby_loaded_features),
rule([:ruby_loaded_features, :ruby_loaded_script],
/^* Loaded features:/, :ruby_loaded_features),
rule(:ruby_loaded_features, /^\n*$/, :ruby_loaded_features_frames),
rule([:ruby_loaded_features_frames, :ruby_loaded_features],
/\d/, :ruby_loaded_features_frames),
rule(:ruby_loaded_features_frames,
/^\n*$/, :ruby_process_memory_map),
rule([:ruby_process_memory_map, :ruby_loaded_features_frames],
/^* Process memory map:/, :ruby_process_memory_map),
rule(:ruby_process_memory_map,
/^\n*$/, :ruby_process_memory_map_frames),
rule([:ruby_process_memory_map_frames, :ruby_process_memory_map],
/\-/, :ruby_process_memory_map_frames),
rule(:ruby_process_memory_map_frames, /^\n*$/, :start_state)
].freeze

DART_RULES = [
rule(:start_state, /^Unhandled exception:$/, :dart_exc),
rule(:dart_exc, /^Instance of/, :dart_stack),
Expand Down Expand Up @@ -149,6 +197,10 @@ def self.supported
rule(:dart_stack, /^<asynchronous suspension>$/, :dart_stack)
].freeze

RUBY_RULES = (
RUBY_ERROR_RULES + RUBY_SEGFAULT_RULES
).freeze

ALL_RULES = (
JAVA_RULES + PYTHON_RULES + PHP_RULES + GO_RULES + RUBY_RULES + DART_RULES
).freeze
Expand Down
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