java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/systemc/token_ring.04.cil-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f4eb214f-m [2019-10-13 23:27:05,024 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-13 23:27:05,027 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-13 23:27:05,046 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-13 23:27:05,046 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-13 23:27:05,048 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-13 23:27:05,050 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-13 23:27:05,052 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-13 23:27:05,056 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-13 23:27:05,057 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-13 23:27:05,059 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-13 23:27:05,061 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-13 23:27:05,061 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-13 23:27:05,064 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-13 23:27:05,066 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-13 23:27:05,068 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-13 23:27:05,069 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-13 23:27:05,071 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-13 23:27:05,073 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-13 23:27:05,079 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-13 23:27:05,083 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-13 23:27:05,086 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-13 23:27:05,088 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-13 23:27:05,089 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-13 23:27:05,091 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-13 23:27:05,091 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-13 23:27:05,092 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-13 23:27:05,093 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-13 23:27:05,095 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-13 23:27:05,096 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-13 23:27:05,096 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-13 23:27:05,098 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-13 23:27:05,099 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-13 23:27:05,100 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-13 23:27:05,101 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-13 23:27:05,101 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-13 23:27:05,102 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-13 23:27:05,102 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-13 23:27:05,102 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-13 23:27:05,103 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-13 23:27:05,104 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-13 23:27:05,105 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-13 23:27:05,123 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-13 23:27:05,124 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-13 23:27:05,127 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-13 23:27:05,128 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-13 23:27:05,128 INFO L138 SettingsManager]: * Use SBE=true [2019-10-13 23:27:05,129 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-13 23:27:05,129 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-13 23:27:05,129 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-13 23:27:05,129 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-13 23:27:05,129 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-13 23:27:05,130 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-13 23:27:05,131 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-13 23:27:05,131 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-13 23:27:05,131 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-13 23:27:05,131 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-13 23:27:05,132 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-13 23:27:05,132 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-13 23:27:05,132 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-13 23:27:05,132 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-13 23:27:05,132 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-13 23:27:05,133 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-13 23:27:05,133 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-13 23:27:05,133 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-13 23:27:05,133 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-13 23:27:05,133 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-13 23:27:05,134 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-13 23:27:05,134 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-13 23:27:05,134 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-13 23:27:05,134 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> SIFA_TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> CompoundDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> LoopFreeBlock Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Call Summarizer -> TopInputCallSummarizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Fluid -> SizeLimitFluid Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Simplification Technique -> SIMPLIFY_QUICK [2019-10-13 23:27:05,429 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-13 23:27:05,442 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-13 23:27:05,446 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-13 23:27:05,447 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-13 23:27:05,448 INFO L275 PluginConnector]: CDTParser initialized [2019-10-13 23:27:05,448 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/systemc/token_ring.04.cil-2.c [2019-10-13 23:27:05,520 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/941a15220/499d0280ddf44bd8ba6b42c9aad02bc3/FLAG07e8cac73 [2019-10-13 23:27:06,016 INFO L306 CDTParser]: Found 1 translation units. [2019-10-13 23:27:06,017 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/systemc/token_ring.04.cil-2.c [2019-10-13 23:27:06,027 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/941a15220/499d0280ddf44bd8ba6b42c9aad02bc3/FLAG07e8cac73 [2019-10-13 23:27:06,336 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/941a15220/499d0280ddf44bd8ba6b42c9aad02bc3 [2019-10-13 23:27:06,346 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-13 23:27:06,348 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-13 23:27:06,349 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-13 23:27:06,349 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-13 23:27:06,352 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-13 23:27:06,353 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 11:27:06" (1/1) ... [2019-10-13 23:27:06,356 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1af986c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:27:06, skipping insertion in model container [2019-10-13 23:27:06,356 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 11:27:06" (1/1) ... [2019-10-13 23:27:06,364 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-13 23:27:06,424 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-13 23:27:06,778 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 23:27:06,788 INFO L188 MainTranslator]: Completed pre-run [2019-10-13 23:27:06,988 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 23:27:07,010 INFO L192 MainTranslator]: Completed translation [2019-10-13 23:27:07,011 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:27:07 WrapperNode [2019-10-13 23:27:07,011 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-13 23:27:07,012 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-13 23:27:07,012 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-13 23:27:07,012 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-13 23:27:07,024 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:27:07" (1/1) ... [2019-10-13 23:27:07,024 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:27:07" (1/1) ... [2019-10-13 23:27:07,033 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:27:07" (1/1) ... [2019-10-13 23:27:07,033 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:27:07" (1/1) ... [2019-10-13 23:27:07,049 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:27:07" (1/1) ... [2019-10-13 23:27:07,072 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:27:07" (1/1) ... [2019-10-13 23:27:07,074 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:27:07" (1/1) ... [2019-10-13 23:27:07,078 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-13 23:27:07,079 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-13 23:27:07,079 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-13 23:27:07,079 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-13 23:27:07,080 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:27:07" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-13 23:27:07,131 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-13 23:27:07,131 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-13 23:27:07,131 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2019-10-13 23:27:07,131 INFO L138 BoogieDeclarations]: Found implementation of procedure master [2019-10-13 23:27:07,131 INFO L138 BoogieDeclarations]: Found implementation of procedure transmit1 [2019-10-13 23:27:07,131 INFO L138 BoogieDeclarations]: Found implementation of procedure transmit2 [2019-10-13 23:27:07,132 INFO L138 BoogieDeclarations]: Found implementation of procedure transmit3 [2019-10-13 23:27:07,132 INFO L138 BoogieDeclarations]: Found implementation of procedure transmit4 [2019-10-13 23:27:07,132 INFO L138 BoogieDeclarations]: Found implementation of procedure is_master_triggered [2019-10-13 23:27:07,132 INFO L138 BoogieDeclarations]: Found implementation of procedure is_transmit1_triggered [2019-10-13 23:27:07,132 INFO L138 BoogieDeclarations]: Found implementation of procedure is_transmit2_triggered [2019-10-13 23:27:07,132 INFO L138 BoogieDeclarations]: Found implementation of procedure is_transmit3_triggered [2019-10-13 23:27:07,133 INFO L138 BoogieDeclarations]: Found implementation of procedure is_transmit4_triggered [2019-10-13 23:27:07,133 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2019-10-13 23:27:07,133 INFO L138 BoogieDeclarations]: Found implementation of procedure init_threads [2019-10-13 23:27:07,133 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2019-10-13 23:27:07,133 INFO L138 BoogieDeclarations]: Found implementation of procedure eval [2019-10-13 23:27:07,133 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2019-10-13 23:27:07,134 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2019-10-13 23:27:07,134 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2019-10-13 23:27:07,134 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2019-10-13 23:27:07,134 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_time_events [2019-10-13 23:27:07,134 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_time_events [2019-10-13 23:27:07,134 INFO L138 BoogieDeclarations]: Found implementation of procedure init_model [2019-10-13 23:27:07,135 INFO L138 BoogieDeclarations]: Found implementation of procedure stop_simulation [2019-10-13 23:27:07,135 INFO L138 BoogieDeclarations]: Found implementation of procedure start_simulation [2019-10-13 23:27:07,135 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-13 23:27:07,135 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-13 23:27:07,135 INFO L130 BoogieDeclarations]: Found specification of procedure error [2019-10-13 23:27:07,136 INFO L130 BoogieDeclarations]: Found specification of procedure is_master_triggered [2019-10-13 23:27:07,136 INFO L130 BoogieDeclarations]: Found specification of procedure is_transmit1_triggered [2019-10-13 23:27:07,136 INFO L130 BoogieDeclarations]: Found specification of procedure is_transmit2_triggered [2019-10-13 23:27:07,136 INFO L130 BoogieDeclarations]: Found specification of procedure is_transmit3_triggered [2019-10-13 23:27:07,136 INFO L130 BoogieDeclarations]: Found specification of procedure is_transmit4_triggered [2019-10-13 23:27:07,136 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2019-10-13 23:27:07,137 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-13 23:27:07,137 INFO L130 BoogieDeclarations]: Found specification of procedure master [2019-10-13 23:27:07,137 INFO L130 BoogieDeclarations]: Found specification of procedure transmit1 [2019-10-13 23:27:07,137 INFO L130 BoogieDeclarations]: Found specification of procedure transmit2 [2019-10-13 23:27:07,137 INFO L130 BoogieDeclarations]: Found specification of procedure transmit3 [2019-10-13 23:27:07,137 INFO L130 BoogieDeclarations]: Found specification of procedure transmit4 [2019-10-13 23:27:07,137 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2019-10-13 23:27:07,138 INFO L130 BoogieDeclarations]: Found specification of procedure init_threads [2019-10-13 23:27:07,138 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2019-10-13 23:27:07,138 INFO L130 BoogieDeclarations]: Found specification of procedure eval [2019-10-13 23:27:07,138 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2019-10-13 23:27:07,138 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2019-10-13 23:27:07,138 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2019-10-13 23:27:07,139 INFO L130 BoogieDeclarations]: Found specification of procedure fire_time_events [2019-10-13 23:27:07,139 INFO L130 BoogieDeclarations]: Found specification of procedure reset_time_events [2019-10-13 23:27:07,139 INFO L130 BoogieDeclarations]: Found specification of procedure init_model [2019-10-13 23:27:07,139 INFO L130 BoogieDeclarations]: Found specification of procedure stop_simulation [2019-10-13 23:27:07,139 INFO L130 BoogieDeclarations]: Found specification of procedure start_simulation [2019-10-13 23:27:07,139 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-13 23:27:07,139 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-13 23:27:07,139 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-13 23:27:08,442 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-13 23:27:08,443 INFO L284 CfgBuilder]: Removed 7 assume(true) statements. [2019-10-13 23:27:08,444 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 11:27:08 BoogieIcfgContainer [2019-10-13 23:27:08,444 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-13 23:27:08,446 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-13 23:27:08,446 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-13 23:27:08,449 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-13 23:27:08,450 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 11:27:06" (1/3) ... [2019-10-13 23:27:08,451 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7df16740 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 11:27:08, skipping insertion in model container [2019-10-13 23:27:08,451 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:27:07" (2/3) ... [2019-10-13 23:27:08,451 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7df16740 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 11:27:08, skipping insertion in model container [2019-10-13 23:27:08,452 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 11:27:08" (3/3) ... [2019-10-13 23:27:08,454 INFO L109 eAbstractionObserver]: Analyzing ICFG token_ring.04.cil-2.c [2019-10-13 23:27:08,464 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-13 23:27:08,474 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-13 23:27:08,487 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-13 23:27:08,516 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-13 23:27:08,516 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-13 23:27:08,517 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-13 23:27:08,517 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-13 23:27:08,517 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-13 23:27:08,518 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-13 23:27:08,518 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-13 23:27:08,518 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-13 23:27:08,543 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states. [2019-10-13 23:27:08,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2019-10-13 23:27:08,555 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:08,556 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 23:27:08,558 INFO L410 AbstractCegarLoop]: === Iteration 1 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:08,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:08,565 INFO L82 PathProgramCache]: Analyzing trace with hash 2119339724, now seen corresponding path program 1 times [2019-10-13 23:27:08,575 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:08,575 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1278638361] [2019-10-13 23:27:08,576 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:08,576 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:08,577 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:08,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:09,006 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 23:27:09,007 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1278638361] [2019-10-13 23:27:09,009 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 23:27:09,009 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-13 23:27:09,010 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167518540] [2019-10-13 23:27:09,016 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 23:27:09,016 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:09,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 23:27:09,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 23:27:09,033 INFO L87 Difference]: Start difference. First operand 164 states. Second operand 4 states. [2019-10-13 23:27:09,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:09,531 INFO L93 Difference]: Finished difference Result 446 states and 623 transitions. [2019-10-13 23:27:09,532 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 23:27:09,534 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 78 [2019-10-13 23:27:09,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:09,565 INFO L225 Difference]: With dead ends: 446 [2019-10-13 23:27:09,565 INFO L226 Difference]: Without dead ends: 286 [2019-10-13 23:27:09,579 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 23:27:09,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2019-10-13 23:27:09,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 285. [2019-10-13 23:27:09,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 285 states. [2019-10-13 23:27:09,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 285 states to 285 states and 368 transitions. [2019-10-13 23:27:09,752 INFO L78 Accepts]: Start accepts. Automaton has 285 states and 368 transitions. Word has length 78 [2019-10-13 23:27:09,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:09,753 INFO L462 AbstractCegarLoop]: Abstraction has 285 states and 368 transitions. [2019-10-13 23:27:09,753 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 23:27:09,754 INFO L276 IsEmpty]: Start isEmpty. Operand 285 states and 368 transitions. [2019-10-13 23:27:09,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2019-10-13 23:27:09,771 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:09,771 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 23:27:09,772 INFO L410 AbstractCegarLoop]: === Iteration 2 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:09,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:09,773 INFO L82 PathProgramCache]: Analyzing trace with hash 1694527536, now seen corresponding path program 1 times [2019-10-13 23:27:09,774 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:09,774 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [924979370] [2019-10-13 23:27:09,774 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:09,774 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:09,775 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:09,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:10,059 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2019-10-13 23:27:10,061 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [924979370] [2019-10-13 23:27:10,064 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1358342332] [2019-10-13 23:27:10,064 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:10,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:10,264 INFO L256 TraceCheckSpWp]: Trace formula consists of 1000 conjuncts, 2 conjunts are in the unsatisfiable core [2019-10-13 23:27:10,277 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 23:27:10,334 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2019-10-13 23:27:10,334 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 23:27:10,520 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2019-10-13 23:27:10,521 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-13 23:27:10,521 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [4] total 6 [2019-10-13 23:27:10,530 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1938414392] [2019-10-13 23:27:10,538 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 23:27:10,538 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:10,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 23:27:10,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2019-10-13 23:27:10,539 INFO L87 Difference]: Start difference. First operand 285 states and 368 transitions. Second operand 4 states. [2019-10-13 23:27:10,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:10,645 INFO L93 Difference]: Finished difference Result 504 states and 662 transitions. [2019-10-13 23:27:10,646 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 23:27:10,646 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 138 [2019-10-13 23:27:10,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:10,656 INFO L225 Difference]: With dead ends: 504 [2019-10-13 23:27:10,656 INFO L226 Difference]: Without dead ends: 364 [2019-10-13 23:27:10,658 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 275 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2019-10-13 23:27:10,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 364 states. [2019-10-13 23:27:10,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 364 to 320. [2019-10-13 23:27:10,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 320 states. [2019-10-13 23:27:10,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 320 states to 320 states and 424 transitions. [2019-10-13 23:27:10,720 INFO L78 Accepts]: Start accepts. Automaton has 320 states and 424 transitions. Word has length 138 [2019-10-13 23:27:10,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:10,724 INFO L462 AbstractCegarLoop]: Abstraction has 320 states and 424 transitions. [2019-10-13 23:27:10,724 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 23:27:10,724 INFO L276 IsEmpty]: Start isEmpty. Operand 320 states and 424 transitions. [2019-10-13 23:27:10,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2019-10-13 23:27:10,730 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:10,731 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 23:27:10,937 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:10,938 INFO L410 AbstractCegarLoop]: === Iteration 3 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:10,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:10,938 INFO L82 PathProgramCache]: Analyzing trace with hash -104772843, now seen corresponding path program 1 times [2019-10-13 23:27:10,938 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:10,939 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507874159] [2019-10-13 23:27:10,939 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:10,939 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:10,939 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:10,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:11,173 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2019-10-13 23:27:11,173 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1507874159] [2019-10-13 23:27:11,174 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2074424624] [2019-10-13 23:27:11,174 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:11,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:11,447 INFO L256 TraceCheckSpWp]: Trace formula consists of 1187 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-13 23:27:11,458 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 23:27:11,521 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2019-10-13 23:27:11,521 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 23:27:11,807 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2019-10-13 23:27:11,808 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-13 23:27:11,808 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 6 [2019-10-13 23:27:11,808 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [31730473] [2019-10-13 23:27:11,809 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-13 23:27:11,810 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:11,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-13 23:27:11,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-10-13 23:27:11,810 INFO L87 Difference]: Start difference. First operand 320 states and 424 transitions. Second operand 3 states. [2019-10-13 23:27:11,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:11,872 INFO L93 Difference]: Finished difference Result 918 states and 1258 transitions. [2019-10-13 23:27:11,872 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 23:27:11,872 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 186 [2019-10-13 23:27:11,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:11,879 INFO L225 Difference]: With dead ends: 918 [2019-10-13 23:27:11,880 INFO L226 Difference]: Without dead ends: 614 [2019-10-13 23:27:11,881 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 377 GetRequests, 365 SyntacticMatches, 8 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-10-13 23:27:11,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 614 states. [2019-10-13 23:27:11,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 614 to 607. [2019-10-13 23:27:11,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 607 states. [2019-10-13 23:27:11,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 607 states to 607 states and 808 transitions. [2019-10-13 23:27:11,939 INFO L78 Accepts]: Start accepts. Automaton has 607 states and 808 transitions. Word has length 186 [2019-10-13 23:27:11,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:11,940 INFO L462 AbstractCegarLoop]: Abstraction has 607 states and 808 transitions. [2019-10-13 23:27:11,941 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-13 23:27:11,941 INFO L276 IsEmpty]: Start isEmpty. Operand 607 states and 808 transitions. [2019-10-13 23:27:11,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2019-10-13 23:27:11,948 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:11,948 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 23:27:12,152 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:12,153 INFO L410 AbstractCegarLoop]: === Iteration 4 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:12,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:12,154 INFO L82 PathProgramCache]: Analyzing trace with hash -272235167, now seen corresponding path program 1 times [2019-10-13 23:27:12,154 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:12,155 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [280890634] [2019-10-13 23:27:12,155 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:12,155 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:12,155 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:12,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:12,281 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 9 proven. 14 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-10-13 23:27:12,282 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [280890634] [2019-10-13 23:27:12,283 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [316145855] [2019-10-13 23:27:12,283 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:12,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:12,539 INFO L256 TraceCheckSpWp]: Trace formula consists of 1178 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-13 23:27:12,545 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 23:27:12,594 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 86 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2019-10-13 23:27:12,595 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 23:27:12,769 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2019-10-13 23:27:12,770 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-13 23:27:12,770 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3, 4] imperfect sequences [6] total 7 [2019-10-13 23:27:12,771 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72883658] [2019-10-13 23:27:12,772 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 23:27:12,772 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:12,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 23:27:12,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2019-10-13 23:27:12,773 INFO L87 Difference]: Start difference. First operand 607 states and 808 transitions. Second operand 4 states. [2019-10-13 23:27:13,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:13,113 INFO L93 Difference]: Finished difference Result 1768 states and 2502 transitions. [2019-10-13 23:27:13,113 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 23:27:13,114 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 186 [2019-10-13 23:27:13,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:13,124 INFO L225 Difference]: With dead ends: 1768 [2019-10-13 23:27:13,124 INFO L226 Difference]: Without dead ends: 1177 [2019-10-13 23:27:13,129 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 373 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2019-10-13 23:27:13,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1177 states. [2019-10-13 23:27:13,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1177 to 1163. [2019-10-13 23:27:13,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1163 states. [2019-10-13 23:27:13,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1163 states to 1163 states and 1537 transitions. [2019-10-13 23:27:13,228 INFO L78 Accepts]: Start accepts. Automaton has 1163 states and 1537 transitions. Word has length 186 [2019-10-13 23:27:13,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:13,229 INFO L462 AbstractCegarLoop]: Abstraction has 1163 states and 1537 transitions. [2019-10-13 23:27:13,229 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 23:27:13,229 INFO L276 IsEmpty]: Start isEmpty. Operand 1163 states and 1537 transitions. [2019-10-13 23:27:13,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2019-10-13 23:27:13,235 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:13,236 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 23:27:13,448 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:13,449 INFO L410 AbstractCegarLoop]: === Iteration 5 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:13,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:13,450 INFO L82 PathProgramCache]: Analyzing trace with hash 1217605220, now seen corresponding path program 1 times [2019-10-13 23:27:13,451 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:13,451 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [439034200] [2019-10-13 23:27:13,452 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:13,452 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:13,452 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:13,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:13,602 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 9 proven. 18 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2019-10-13 23:27:13,602 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [439034200] [2019-10-13 23:27:13,603 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1841053586] [2019-10-13 23:27:13,603 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:13,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:13,814 INFO L256 TraceCheckSpWp]: Trace formula consists of 1178 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-13 23:27:13,820 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 23:27:13,852 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 86 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2019-10-13 23:27:13,853 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 23:27:14,119 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2019-10-13 23:27:14,120 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-13 23:27:14,120 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3, 4] imperfect sequences [6] total 7 [2019-10-13 23:27:14,120 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543521190] [2019-10-13 23:27:14,121 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 23:27:14,121 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:14,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 23:27:14,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2019-10-13 23:27:14,122 INFO L87 Difference]: Start difference. First operand 1163 states and 1537 transitions. Second operand 4 states. [2019-10-13 23:27:14,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:14,500 INFO L93 Difference]: Finished difference Result 3416 states and 4809 transitions. [2019-10-13 23:27:14,500 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 23:27:14,501 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 186 [2019-10-13 23:27:14,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:14,520 INFO L225 Difference]: With dead ends: 3416 [2019-10-13 23:27:14,520 INFO L226 Difference]: Without dead ends: 2269 [2019-10-13 23:27:14,530 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 373 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2019-10-13 23:27:14,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2269 states. [2019-10-13 23:27:14,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2269 to 2245. [2019-10-13 23:27:14,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2245 states. [2019-10-13 23:27:14,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2245 states to 2245 states and 2949 transitions. [2019-10-13 23:27:14,673 INFO L78 Accepts]: Start accepts. Automaton has 2245 states and 2949 transitions. Word has length 186 [2019-10-13 23:27:14,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:14,674 INFO L462 AbstractCegarLoop]: Abstraction has 2245 states and 2949 transitions. [2019-10-13 23:27:14,674 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 23:27:14,674 INFO L276 IsEmpty]: Start isEmpty. Operand 2245 states and 2949 transitions. [2019-10-13 23:27:14,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2019-10-13 23:27:14,683 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:14,683 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 23:27:14,889 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:14,889 INFO L410 AbstractCegarLoop]: === Iteration 6 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:14,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:14,890 INFO L82 PathProgramCache]: Analyzing trace with hash -773567800, now seen corresponding path program 1 times [2019-10-13 23:27:14,891 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:14,891 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [539264132] [2019-10-13 23:27:14,891 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:14,891 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:14,892 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:14,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:15,079 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 9 proven. 22 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2019-10-13 23:27:15,080 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [539264132] [2019-10-13 23:27:15,080 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [962083467] [2019-10-13 23:27:15,080 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:15,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:15,300 INFO L256 TraceCheckSpWp]: Trace formula consists of 1178 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-13 23:27:15,304 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 23:27:15,337 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 86 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2019-10-13 23:27:15,337 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 23:27:15,525 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 33 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2019-10-13 23:27:15,526 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-13 23:27:15,526 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3, 4] imperfect sequences [6] total 7 [2019-10-13 23:27:15,526 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1615172103] [2019-10-13 23:27:15,528 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 23:27:15,529 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:15,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 23:27:15,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2019-10-13 23:27:15,529 INFO L87 Difference]: Start difference. First operand 2245 states and 2949 transitions. Second operand 4 states. [2019-10-13 23:27:16,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:16,032 INFO L93 Difference]: Finished difference Result 6622 states and 9315 transitions. [2019-10-13 23:27:16,033 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 23:27:16,033 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 186 [2019-10-13 23:27:16,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:16,064 INFO L225 Difference]: With dead ends: 6622 [2019-10-13 23:27:16,065 INFO L226 Difference]: Without dead ends: 4393 [2019-10-13 23:27:16,086 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 373 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2019-10-13 23:27:16,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4393 states. [2019-10-13 23:27:16,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4393 to 4349. [2019-10-13 23:27:16,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4349 states. [2019-10-13 23:27:16,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4349 states to 4349 states and 5699 transitions. [2019-10-13 23:27:16,388 INFO L78 Accepts]: Start accepts. Automaton has 4349 states and 5699 transitions. Word has length 186 [2019-10-13 23:27:16,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:16,389 INFO L462 AbstractCegarLoop]: Abstraction has 4349 states and 5699 transitions. [2019-10-13 23:27:16,389 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 23:27:16,389 INFO L276 IsEmpty]: Start isEmpty. Operand 4349 states and 5699 transitions. [2019-10-13 23:27:16,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2019-10-13 23:27:16,416 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:16,416 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 23:27:16,623 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:16,624 INFO L410 AbstractCegarLoop]: === Iteration 7 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:16,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:16,624 INFO L82 PathProgramCache]: Analyzing trace with hash -1579190277, now seen corresponding path program 1 times [2019-10-13 23:27:16,625 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:16,625 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2069764295] [2019-10-13 23:27:16,625 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:16,625 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:16,626 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:16,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:16,795 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 21 proven. 7 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2019-10-13 23:27:16,795 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2069764295] [2019-10-13 23:27:16,796 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1120975761] [2019-10-13 23:27:16,796 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:17,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:17,137 INFO L256 TraceCheckSpWp]: Trace formula consists of 1248 conjuncts, 2 conjunts are in the unsatisfiable core [2019-10-13 23:27:17,144 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 23:27:17,183 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 107 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2019-10-13 23:27:17,183 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 23:27:17,353 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 25 proven. 1 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2019-10-13 23:27:17,353 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-13 23:27:17,353 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8, 3] total 10 [2019-10-13 23:27:17,354 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1030678086] [2019-10-13 23:27:17,354 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-13 23:27:17,355 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:17,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-13 23:27:17,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2019-10-13 23:27:17,355 INFO L87 Difference]: Start difference. First operand 4349 states and 5699 transitions. Second operand 3 states. [2019-10-13 23:27:17,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:17,612 INFO L93 Difference]: Finished difference Result 8141 states and 10933 transitions. [2019-10-13 23:27:17,612 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 23:27:17,612 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 202 [2019-10-13 23:27:17,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:17,658 INFO L225 Difference]: With dead ends: 8141 [2019-10-13 23:27:17,658 INFO L226 Difference]: Without dead ends: 5925 [2019-10-13 23:27:17,682 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 403 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2019-10-13 23:27:17,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5925 states. [2019-10-13 23:27:18,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5925 to 4883. [2019-10-13 23:27:18,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4883 states. [2019-10-13 23:27:18,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4883 states to 4883 states and 6469 transitions. [2019-10-13 23:27:18,099 INFO L78 Accepts]: Start accepts. Automaton has 4883 states and 6469 transitions. Word has length 202 [2019-10-13 23:27:18,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:18,099 INFO L462 AbstractCegarLoop]: Abstraction has 4883 states and 6469 transitions. [2019-10-13 23:27:18,100 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-13 23:27:18,100 INFO L276 IsEmpty]: Start isEmpty. Operand 4883 states and 6469 transitions. [2019-10-13 23:27:18,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2019-10-13 23:27:18,133 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:18,133 INFO L380 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 23:27:18,339 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:18,339 INFO L410 AbstractCegarLoop]: === Iteration 8 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:18,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:18,340 INFO L82 PathProgramCache]: Analyzing trace with hash -126022762, now seen corresponding path program 1 times [2019-10-13 23:27:18,341 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:18,341 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [891531235] [2019-10-13 23:27:18,341 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:18,341 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:18,341 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:18,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:18,541 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 48 proven. 31 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2019-10-13 23:27:18,542 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [891531235] [2019-10-13 23:27:18,542 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1068250032] [2019-10-13 23:27:18,542 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:18,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:18,843 INFO L256 TraceCheckSpWp]: Trace formula consists of 1599 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-13 23:27:18,854 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 23:27:18,995 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 244 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2019-10-13 23:27:18,995 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 23:27:19,402 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 45 proven. 6 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2019-10-13 23:27:19,403 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-13 23:27:19,403 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7, 4] total 12 [2019-10-13 23:27:19,403 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138499415] [2019-10-13 23:27:19,404 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-13 23:27:19,404 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:19,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-13 23:27:19,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2019-10-13 23:27:19,405 INFO L87 Difference]: Start difference. First operand 4883 states and 6469 transitions. Second operand 6 states. [2019-10-13 23:27:20,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:20,107 INFO L93 Difference]: Finished difference Result 8353 states and 11220 transitions. [2019-10-13 23:27:20,107 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-13 23:27:20,107 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 276 [2019-10-13 23:27:20,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:20,144 INFO L225 Difference]: With dead ends: 8353 [2019-10-13 23:27:20,144 INFO L226 Difference]: Without dead ends: 5603 [2019-10-13 23:27:20,170 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 567 GetRequests, 554 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2019-10-13 23:27:20,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5603 states. [2019-10-13 23:27:20,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5603 to 5603. [2019-10-13 23:27:20,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5603 states. [2019-10-13 23:27:20,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5603 states to 5603 states and 7189 transitions. [2019-10-13 23:27:20,585 INFO L78 Accepts]: Start accepts. Automaton has 5603 states and 7189 transitions. Word has length 276 [2019-10-13 23:27:20,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:20,586 INFO L462 AbstractCegarLoop]: Abstraction has 5603 states and 7189 transitions. [2019-10-13 23:27:20,586 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-13 23:27:20,586 INFO L276 IsEmpty]: Start isEmpty. Operand 5603 states and 7189 transitions. [2019-10-13 23:27:20,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2019-10-13 23:27:20,617 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:20,617 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 23:27:20,823 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:20,824 INFO L410 AbstractCegarLoop]: === Iteration 9 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:20,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:20,824 INFO L82 PathProgramCache]: Analyzing trace with hash -1621482354, now seen corresponding path program 1 times [2019-10-13 23:27:20,825 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:20,825 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1490016348] [2019-10-13 23:27:20,825 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:20,826 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:20,826 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:20,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:20,953 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 23 proven. 3 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2019-10-13 23:27:20,954 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1490016348] [2019-10-13 23:27:20,954 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [88114214] [2019-10-13 23:27:20,955 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:21,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:21,252 INFO L256 TraceCheckSpWp]: Trace formula consists of 1245 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-13 23:27:21,258 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 23:27:21,305 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 139 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-10-13 23:27:21,306 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 23:27:21,525 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 30 proven. 8 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2019-10-13 23:27:21,526 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-13 23:27:21,526 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 6 [2019-10-13 23:27:21,526 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384137787] [2019-10-13 23:27:21,527 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-13 23:27:21,527 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:21,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-13 23:27:21,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2019-10-13 23:27:21,528 INFO L87 Difference]: Start difference. First operand 5603 states and 7189 transitions. Second operand 3 states. [2019-10-13 23:27:21,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:21,850 INFO L93 Difference]: Finished difference Result 8729 states and 11567 transitions. [2019-10-13 23:27:21,850 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 23:27:21,851 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 202 [2019-10-13 23:27:21,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:21,900 INFO L225 Difference]: With dead ends: 8729 [2019-10-13 23:27:21,900 INFO L226 Difference]: Without dead ends: 5615 [2019-10-13 23:27:21,927 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 404 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2019-10-13 23:27:21,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5615 states. [2019-10-13 23:27:22,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5615 to 5571. [2019-10-13 23:27:22,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5571 states. [2019-10-13 23:27:22,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5571 states to 5571 states and 7069 transitions. [2019-10-13 23:27:22,302 INFO L78 Accepts]: Start accepts. Automaton has 5571 states and 7069 transitions. Word has length 202 [2019-10-13 23:27:22,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:22,302 INFO L462 AbstractCegarLoop]: Abstraction has 5571 states and 7069 transitions. [2019-10-13 23:27:22,303 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-13 23:27:22,303 INFO L276 IsEmpty]: Start isEmpty. Operand 5571 states and 7069 transitions. [2019-10-13 23:27:22,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2019-10-13 23:27:22,332 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:22,333 INFO L380 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 23:27:22,537 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:22,538 INFO L410 AbstractCegarLoop]: === Iteration 10 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:22,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:22,539 INFO L82 PathProgramCache]: Analyzing trace with hash -1077510136, now seen corresponding path program 1 times [2019-10-13 23:27:22,539 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:22,539 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [232693320] [2019-10-13 23:27:22,540 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:22,540 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:22,541 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:22,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:22,774 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 48 proven. 31 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2019-10-13 23:27:22,774 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [232693320] [2019-10-13 23:27:22,775 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [332008404] [2019-10-13 23:27:22,775 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:23,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:23,103 INFO L256 TraceCheckSpWp]: Trace formula consists of 1599 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-13 23:27:23,110 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 23:27:23,294 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 244 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2019-10-13 23:27:23,294 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 23:27:23,659 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 49 proven. 8 refuted. 0 times theorem prover too weak. 241 trivial. 0 not checked. [2019-10-13 23:27:23,660 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-13 23:27:23,660 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7, 4] total 12 [2019-10-13 23:27:23,660 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1031265242] [2019-10-13 23:27:23,663 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-13 23:27:23,664 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:23,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-13 23:27:23,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2019-10-13 23:27:23,664 INFO L87 Difference]: Start difference. First operand 5571 states and 7069 transitions. Second operand 6 states. [2019-10-13 23:27:24,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:24,372 INFO L93 Difference]: Finished difference Result 9375 states and 11983 transitions. [2019-10-13 23:27:24,373 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-13 23:27:24,373 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 276 [2019-10-13 23:27:24,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:24,404 INFO L225 Difference]: With dead ends: 9375 [2019-10-13 23:27:24,404 INFO L226 Difference]: Without dead ends: 6283 [2019-10-13 23:27:24,417 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 567 GetRequests, 554 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2019-10-13 23:27:24,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6283 states. [2019-10-13 23:27:24,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6283 to 6283. [2019-10-13 23:27:24,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6283 states. [2019-10-13 23:27:24,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6283 states to 6283 states and 7749 transitions. [2019-10-13 23:27:24,865 INFO L78 Accepts]: Start accepts. Automaton has 6283 states and 7749 transitions. Word has length 276 [2019-10-13 23:27:24,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:24,866 INFO L462 AbstractCegarLoop]: Abstraction has 6283 states and 7749 transitions. [2019-10-13 23:27:24,866 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-13 23:27:24,866 INFO L276 IsEmpty]: Start isEmpty. Operand 6283 states and 7749 transitions. [2019-10-13 23:27:24,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2019-10-13 23:27:24,897 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:24,897 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 23:27:25,105 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:25,106 INFO L410 AbstractCegarLoop]: === Iteration 11 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:25,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:25,106 INFO L82 PathProgramCache]: Analyzing trace with hash 317482813, now seen corresponding path program 1 times [2019-10-13 23:27:25,107 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:25,107 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2031829433] [2019-10-13 23:27:25,107 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:25,109 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:25,109 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:25,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:25,253 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 23 proven. 5 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2019-10-13 23:27:25,254 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2031829433] [2019-10-13 23:27:25,254 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1707201371] [2019-10-13 23:27:25,254 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:25,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:25,673 INFO L256 TraceCheckSpWp]: Trace formula consists of 1248 conjuncts, 2 conjunts are in the unsatisfiable core [2019-10-13 23:27:25,679 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 23:27:25,736 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 107 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2019-10-13 23:27:25,736 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 23:27:25,993 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 25 proven. 1 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2019-10-13 23:27:25,994 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-13 23:27:25,994 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8, 3] total 10 [2019-10-13 23:27:25,995 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978740894] [2019-10-13 23:27:25,995 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-13 23:27:25,996 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:25,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-13 23:27:25,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2019-10-13 23:27:25,996 INFO L87 Difference]: Start difference. First operand 6283 states and 7749 transitions. Second operand 3 states. [2019-10-13 23:27:26,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:26,383 INFO L93 Difference]: Finished difference Result 11495 states and 14534 transitions. [2019-10-13 23:27:26,383 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 23:27:26,383 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 202 [2019-10-13 23:27:26,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:26,431 INFO L225 Difference]: With dead ends: 11495 [2019-10-13 23:27:26,431 INFO L226 Difference]: Without dead ends: 8043 [2019-10-13 23:27:26,532 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 403 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2019-10-13 23:27:26,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8043 states. [2019-10-13 23:27:26,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8043 to 7043. [2019-10-13 23:27:26,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7043 states. [2019-10-13 23:27:26,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7043 states to 7043 states and 8835 transitions. [2019-10-13 23:27:26,939 INFO L78 Accepts]: Start accepts. Automaton has 7043 states and 8835 transitions. Word has length 202 [2019-10-13 23:27:26,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:26,940 INFO L462 AbstractCegarLoop]: Abstraction has 7043 states and 8835 transitions. [2019-10-13 23:27:26,940 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-13 23:27:26,940 INFO L276 IsEmpty]: Start isEmpty. Operand 7043 states and 8835 transitions. [2019-10-13 23:27:26,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2019-10-13 23:27:26,965 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:26,966 INFO L380 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 23:27:27,171 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:27,172 INFO L410 AbstractCegarLoop]: === Iteration 12 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:27,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:27,172 INFO L82 PathProgramCache]: Analyzing trace with hash 1303327769, now seen corresponding path program 1 times [2019-10-13 23:27:27,173 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:27,173 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1933854325] [2019-10-13 23:27:27,173 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:27,173 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:27,173 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:27,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:27,338 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 48 proven. 31 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2019-10-13 23:27:27,339 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1933854325] [2019-10-13 23:27:27,339 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2050243461] [2019-10-13 23:27:27,339 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:27,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:27,677 INFO L256 TraceCheckSpWp]: Trace formula consists of 1599 conjuncts, 2 conjunts are in the unsatisfiable core [2019-10-13 23:27:27,685 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 23:27:27,750 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 147 proven. 0 refuted. 0 times theorem prover too weak. 151 trivial. 0 not checked. [2019-10-13 23:27:27,750 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 23:27:28,056 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 58 proven. 0 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2019-10-13 23:27:28,056 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-13 23:27:28,057 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3, 4] imperfect sequences [7] total 9 [2019-10-13 23:27:28,057 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969496981] [2019-10-13 23:27:28,058 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 23:27:28,058 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:28,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 23:27:28,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2019-10-13 23:27:28,059 INFO L87 Difference]: Start difference. First operand 7043 states and 8835 transitions. Second operand 4 states. [2019-10-13 23:27:28,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:28,573 INFO L93 Difference]: Finished difference Result 11844 states and 14831 transitions. [2019-10-13 23:27:28,574 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 23:27:28,574 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 276 [2019-10-13 23:27:28,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:28,611 INFO L225 Difference]: With dead ends: 11844 [2019-10-13 23:27:28,611 INFO L226 Difference]: Without dead ends: 8379 [2019-10-13 23:27:28,630 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 563 GetRequests, 550 SyntacticMatches, 6 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2019-10-13 23:27:28,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8379 states. [2019-10-13 23:27:29,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8379 to 8379. [2019-10-13 23:27:29,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8379 states. [2019-10-13 23:27:29,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8379 states to 8379 states and 10155 transitions. [2019-10-13 23:27:29,103 INFO L78 Accepts]: Start accepts. Automaton has 8379 states and 10155 transitions. Word has length 276 [2019-10-13 23:27:29,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:29,104 INFO L462 AbstractCegarLoop]: Abstraction has 8379 states and 10155 transitions. [2019-10-13 23:27:29,104 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 23:27:29,104 INFO L276 IsEmpty]: Start isEmpty. Operand 8379 states and 10155 transitions. [2019-10-13 23:27:29,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2019-10-13 23:27:29,133 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:29,134 INFO L380 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 23:27:29,339 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:29,340 INFO L410 AbstractCegarLoop]: === Iteration 13 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:29,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:29,340 INFO L82 PathProgramCache]: Analyzing trace with hash -622035404, now seen corresponding path program 1 times [2019-10-13 23:27:29,340 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:29,341 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1041490530] [2019-10-13 23:27:29,341 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:29,341 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:29,342 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:29,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:29,533 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 48 proven. 31 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2019-10-13 23:27:29,533 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1041490530] [2019-10-13 23:27:29,533 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1139815545] [2019-10-13 23:27:29,534 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:30,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:30,031 INFO L256 TraceCheckSpWp]: Trace formula consists of 1599 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-13 23:27:30,038 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 23:27:30,187 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 244 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2019-10-13 23:27:30,188 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 23:27:30,547 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 53 proven. 10 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2019-10-13 23:27:30,548 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-13 23:27:30,548 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7, 4] total 12 [2019-10-13 23:27:30,548 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1267527931] [2019-10-13 23:27:30,549 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-13 23:27:30,549 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:30,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-13 23:27:30,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2019-10-13 23:27:30,549 INFO L87 Difference]: Start difference. First operand 8379 states and 10155 transitions. Second operand 6 states. [2019-10-13 23:27:31,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:31,317 INFO L93 Difference]: Finished difference Result 13711 states and 16827 transitions. [2019-10-13 23:27:31,317 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-13 23:27:31,317 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 276 [2019-10-13 23:27:31,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:31,368 INFO L225 Difference]: With dead ends: 13711 [2019-10-13 23:27:31,368 INFO L226 Difference]: Without dead ends: 9067 [2019-10-13 23:27:31,388 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 567 GetRequests, 554 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2019-10-13 23:27:31,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9067 states. [2019-10-13 23:27:31,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9067 to 9067. [2019-10-13 23:27:31,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9067 states. [2019-10-13 23:27:31,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9067 states to 9067 states and 10763 transitions. [2019-10-13 23:27:32,000 INFO L78 Accepts]: Start accepts. Automaton has 9067 states and 10763 transitions. Word has length 276 [2019-10-13 23:27:32,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:32,000 INFO L462 AbstractCegarLoop]: Abstraction has 9067 states and 10763 transitions. [2019-10-13 23:27:32,000 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-13 23:27:32,000 INFO L276 IsEmpty]: Start isEmpty. Operand 9067 states and 10763 transitions. [2019-10-13 23:27:32,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 280 [2019-10-13 23:27:32,017 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:32,017 INFO L380 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 23:27:32,223 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:32,224 INFO L410 AbstractCegarLoop]: === Iteration 14 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:32,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:32,224 INFO L82 PathProgramCache]: Analyzing trace with hash 1836045459, now seen corresponding path program 1 times [2019-10-13 23:27:32,224 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:32,224 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1366036371] [2019-10-13 23:27:32,224 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:32,224 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:32,225 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:32,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:32,423 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 48 proven. 31 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2019-10-13 23:27:32,424 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1366036371] [2019-10-13 23:27:32,424 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1814566485] [2019-10-13 23:27:32,425 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:32,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:32,827 INFO L256 TraceCheckSpWp]: Trace formula consists of 1596 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-13 23:27:32,836 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 23:27:32,933 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 162 proven. 4 refuted. 0 times theorem prover too weak. 138 trivial. 0 not checked. [2019-10-13 23:27:32,934 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 23:27:33,199 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 23:27:33,302 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 23:27:33,302 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 23:27:33,317 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 23:27:33,363 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 33 proven. 36 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2019-10-13 23:27:33,363 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2139431954] [2019-10-13 23:27:33,402 INFO L162 IcfgInterpreter]: Started Sifa with 119 locations of interest [2019-10-13 23:27:33,402 INFO L169 IcfgInterpreter]: Building call graph [2019-10-13 23:27:33,409 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-13 23:27:33,433 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-13 23:27:33,434 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-13 23:27:33,840 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 82 for LOIs [2019-10-13 23:27:33,906 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 137 for LOIs [2019-10-13 23:27:34,104 WARN L191 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 165 [2019-10-13 23:27:34,208 WARN L191 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 219 [2019-10-13 23:27:34,665 WARN L191 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 220 [2019-10-13 23:27:35,009 INFO L199 IcfgInterpreter]: Interpreting procedure init_model with input of size 87 for LOIs [2019-10-13 23:27:35,119 INFO L199 IcfgInterpreter]: Interpreting procedure start_simulation with input of size 148 for LOIs