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.03.cil-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f4eb214f-m [2019-10-13 23:27:02,750 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-13 23:27:02,752 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-13 23:27:02,772 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-13 23:27:02,772 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-13 23:27:02,774 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-13 23:27:02,776 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-13 23:27:02,785 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-13 23:27:02,790 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-13 23:27:02,794 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-13 23:27:02,794 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-13 23:27:02,795 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-13 23:27:02,796 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-13 23:27:02,796 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-13 23:27:02,797 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-13 23:27:02,798 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-13 23:27:02,799 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-13 23:27:02,799 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-13 23:27:02,801 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-13 23:27:02,802 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-13 23:27:02,804 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-13 23:27:02,805 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-13 23:27:02,806 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-13 23:27:02,806 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-13 23:27:02,808 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-13 23:27:02,808 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-13 23:27:02,809 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-13 23:27:02,809 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-13 23:27:02,810 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-13 23:27:02,811 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-13 23:27:02,811 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-13 23:27:02,812 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-13 23:27:02,812 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-13 23:27:02,813 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-13 23:27:02,814 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-13 23:27:02,814 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-13 23:27:02,815 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-13 23:27:02,815 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-13 23:27:02,815 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-13 23:27:02,816 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-13 23:27:02,816 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-13 23:27:02,817 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 23:27:02,831 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-13 23:27:02,831 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-13 23:27:02,832 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-13 23:27:02,833 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-13 23:27:02,833 INFO L138 SettingsManager]: * Use SBE=true [2019-10-13 23:27:02,833 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-13 23:27:02,833 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-13 23:27:02,834 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-13 23:27:02,834 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-13 23:27:02,834 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-13 23:27:02,834 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-13 23:27:02,834 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-13 23:27:02,834 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-13 23:27:02,835 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-13 23:27:02,835 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-13 23:27:02,835 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-13 23:27:02,835 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-13 23:27:02,835 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-13 23:27:02,836 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-13 23:27:02,836 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-13 23:27:02,836 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-13 23:27:02,836 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-13 23:27:02,836 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-13 23:27:02,837 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-13 23:27:02,837 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-13 23:27:02,837 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-13 23:27:02,837 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-13 23:27:02,837 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-13 23:27:02,838 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 23:27:03,115 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-13 23:27:03,126 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-13 23:27:03,129 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-13 23:27:03,131 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-13 23:27:03,131 INFO L275 PluginConnector]: CDTParser initialized [2019-10-13 23:27:03,132 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/systemc/token_ring.03.cil-1.c [2019-10-13 23:27:03,210 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6db80350f/e83eaa15280d4938bba16308e7e4e3da/FLAG2e3582bf2 [2019-10-13 23:27:03,739 INFO L306 CDTParser]: Found 1 translation units. [2019-10-13 23:27:03,742 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/systemc/token_ring.03.cil-1.c [2019-10-13 23:27:03,758 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6db80350f/e83eaa15280d4938bba16308e7e4e3da/FLAG2e3582bf2 [2019-10-13 23:27:04,105 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6db80350f/e83eaa15280d4938bba16308e7e4e3da [2019-10-13 23:27:04,113 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-13 23:27:04,115 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-13 23:27:04,116 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-13 23:27:04,116 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-13 23:27:04,119 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-13 23:27:04,120 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 11:27:04" (1/1) ... [2019-10-13 23:27:04,123 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2621afd9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:27:04, skipping insertion in model container [2019-10-13 23:27:04,123 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 11:27:04" (1/1) ... [2019-10-13 23:27:04,130 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-13 23:27:04,179 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-13 23:27:04,431 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 23:27:04,445 INFO L188 MainTranslator]: Completed pre-run [2019-10-13 23:27:04,574 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 23:27:04,600 INFO L192 MainTranslator]: Completed translation [2019-10-13 23:27:04,600 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:27:04 WrapperNode [2019-10-13 23:27:04,600 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-13 23:27:04,601 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-13 23:27:04,601 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-13 23:27:04,601 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-13 23:27:04,611 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:27:04" (1/1) ... [2019-10-13 23:27:04,611 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:27:04" (1/1) ... [2019-10-13 23:27:04,620 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:27:04" (1/1) ... [2019-10-13 23:27:04,620 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:27:04" (1/1) ... [2019-10-13 23:27:04,631 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:27:04" (1/1) ... [2019-10-13 23:27:04,645 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:27:04" (1/1) ... [2019-10-13 23:27:04,651 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:27:04" (1/1) ... [2019-10-13 23:27:04,655 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-13 23:27:04,656 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-13 23:27:04,656 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-13 23:27:04,656 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-13 23:27:04,657 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:27:04" (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 23:27:04,713 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-13 23:27:04,713 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-13 23:27:04,713 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2019-10-13 23:27:04,714 INFO L138 BoogieDeclarations]: Found implementation of procedure master [2019-10-13 23:27:04,714 INFO L138 BoogieDeclarations]: Found implementation of procedure transmit1 [2019-10-13 23:27:04,714 INFO L138 BoogieDeclarations]: Found implementation of procedure transmit2 [2019-10-13 23:27:04,715 INFO L138 BoogieDeclarations]: Found implementation of procedure transmit3 [2019-10-13 23:27:04,715 INFO L138 BoogieDeclarations]: Found implementation of procedure is_master_triggered [2019-10-13 23:27:04,715 INFO L138 BoogieDeclarations]: Found implementation of procedure is_transmit1_triggered [2019-10-13 23:27:04,715 INFO L138 BoogieDeclarations]: Found implementation of procedure is_transmit2_triggered [2019-10-13 23:27:04,715 INFO L138 BoogieDeclarations]: Found implementation of procedure is_transmit3_triggered [2019-10-13 23:27:04,716 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2019-10-13 23:27:04,716 INFO L138 BoogieDeclarations]: Found implementation of procedure init_threads [2019-10-13 23:27:04,716 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2019-10-13 23:27:04,718 INFO L138 BoogieDeclarations]: Found implementation of procedure eval [2019-10-13 23:27:04,718 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2019-10-13 23:27:04,721 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2019-10-13 23:27:04,721 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2019-10-13 23:27:04,721 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2019-10-13 23:27:04,721 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_time_events [2019-10-13 23:27:04,721 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_time_events [2019-10-13 23:27:04,722 INFO L138 BoogieDeclarations]: Found implementation of procedure init_model [2019-10-13 23:27:04,722 INFO L138 BoogieDeclarations]: Found implementation of procedure stop_simulation [2019-10-13 23:27:04,723 INFO L138 BoogieDeclarations]: Found implementation of procedure start_simulation [2019-10-13 23:27:04,723 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-13 23:27:04,723 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-13 23:27:04,723 INFO L130 BoogieDeclarations]: Found specification of procedure error [2019-10-13 23:27:04,723 INFO L130 BoogieDeclarations]: Found specification of procedure is_master_triggered [2019-10-13 23:27:04,723 INFO L130 BoogieDeclarations]: Found specification of procedure is_transmit1_triggered [2019-10-13 23:27:04,724 INFO L130 BoogieDeclarations]: Found specification of procedure is_transmit2_triggered [2019-10-13 23:27:04,724 INFO L130 BoogieDeclarations]: Found specification of procedure is_transmit3_triggered [2019-10-13 23:27:04,724 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2019-10-13 23:27:04,724 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-13 23:27:04,725 INFO L130 BoogieDeclarations]: Found specification of procedure master [2019-10-13 23:27:04,725 INFO L130 BoogieDeclarations]: Found specification of procedure transmit1 [2019-10-13 23:27:04,725 INFO L130 BoogieDeclarations]: Found specification of procedure transmit2 [2019-10-13 23:27:04,725 INFO L130 BoogieDeclarations]: Found specification of procedure transmit3 [2019-10-13 23:27:04,725 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2019-10-13 23:27:04,726 INFO L130 BoogieDeclarations]: Found specification of procedure init_threads [2019-10-13 23:27:04,726 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2019-10-13 23:27:04,726 INFO L130 BoogieDeclarations]: Found specification of procedure eval [2019-10-13 23:27:04,726 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2019-10-13 23:27:04,726 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2019-10-13 23:27:04,726 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2019-10-13 23:27:04,727 INFO L130 BoogieDeclarations]: Found specification of procedure fire_time_events [2019-10-13 23:27:04,727 INFO L130 BoogieDeclarations]: Found specification of procedure reset_time_events [2019-10-13 23:27:04,727 INFO L130 BoogieDeclarations]: Found specification of procedure init_model [2019-10-13 23:27:04,727 INFO L130 BoogieDeclarations]: Found specification of procedure stop_simulation [2019-10-13 23:27:04,727 INFO L130 BoogieDeclarations]: Found specification of procedure start_simulation [2019-10-13 23:27:04,727 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-13 23:27:04,727 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-13 23:27:04,727 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-13 23:27:05,836 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-13 23:27:05,837 INFO L284 CfgBuilder]: Removed 6 assume(true) statements. [2019-10-13 23:27:05,838 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 11:27:05 BoogieIcfgContainer [2019-10-13 23:27:05,838 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-13 23:27:05,839 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-13 23:27:05,840 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-13 23:27:05,842 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-13 23:27:05,843 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 11:27:04" (1/3) ... [2019-10-13 23:27:05,844 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@560a7f56 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 11:27:05, skipping insertion in model container [2019-10-13 23:27:05,844 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:27:04" (2/3) ... [2019-10-13 23:27:05,844 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@560a7f56 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 11:27:05, skipping insertion in model container [2019-10-13 23:27:05,844 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 11:27:05" (3/3) ... [2019-10-13 23:27:05,846 INFO L109 eAbstractionObserver]: Analyzing ICFG token_ring.03.cil-1.c [2019-10-13 23:27:05,856 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-13 23:27:05,864 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-13 23:27:05,875 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-13 23:27:05,908 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-13 23:27:05,908 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-13 23:27:05,908 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-13 23:27:05,908 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-13 23:27:05,909 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-13 23:27:05,910 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-13 23:27:05,910 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-13 23:27:05,911 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-13 23:27:05,942 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states. [2019-10-13 23:27:05,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2019-10-13 23:27:05,958 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:05,959 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] [2019-10-13 23:27:05,962 INFO L410 AbstractCegarLoop]: === Iteration 1 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:05,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:05,969 INFO L82 PathProgramCache]: Analyzing trace with hash 1944161368, now seen corresponding path program 1 times [2019-10-13 23:27:05,977 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:05,978 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1915601151] [2019-10-13 23:27:05,978 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:05,978 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:05,978 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:06,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:06,384 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 23:27:06,385 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1915601151] [2019-10-13 23:27:06,386 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 23:27:06,387 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-13 23:27:06,388 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [461076245] [2019-10-13 23:27:06,396 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-13 23:27:06,397 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:06,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-13 23:27:06,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-13 23:27:06,418 INFO L87 Difference]: Start difference. First operand 147 states. Second operand 3 states. [2019-10-13 23:27:06,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:06,585 INFO L93 Difference]: Finished difference Result 395 states and 548 transitions. [2019-10-13 23:27:06,586 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 23:27:06,587 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 71 [2019-10-13 23:27:06,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:06,616 INFO L225 Difference]: With dead ends: 395 [2019-10-13 23:27:06,616 INFO L226 Difference]: Without dead ends: 252 [2019-10-13 23:27:06,628 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-13 23:27:06,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2019-10-13 23:27:06,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 251. [2019-10-13 23:27:06,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 251 states. [2019-10-13 23:27:06,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 335 transitions. [2019-10-13 23:27:06,713 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 335 transitions. Word has length 71 [2019-10-13 23:27:06,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:06,714 INFO L462 AbstractCegarLoop]: Abstraction has 251 states and 335 transitions. [2019-10-13 23:27:06,714 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-13 23:27:06,714 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 335 transitions. [2019-10-13 23:27:06,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2019-10-13 23:27:06,721 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:06,722 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 23:27:06,722 INFO L410 AbstractCegarLoop]: === Iteration 2 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:06,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:06,722 INFO L82 PathProgramCache]: Analyzing trace with hash -412651718, now seen corresponding path program 1 times [2019-10-13 23:27:06,723 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:06,723 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2015109340] [2019-10-13 23:27:06,723 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:06,723 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:06,723 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:06,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:06,928 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2019-10-13 23:27:06,929 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2015109340] [2019-10-13 23:27:06,930 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 23:27:06,930 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-13 23:27:06,930 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643877770] [2019-10-13 23:27:06,937 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 23:27:06,940 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:06,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 23:27:06,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-13 23:27:06,941 INFO L87 Difference]: Start difference. First operand 251 states and 335 transitions. Second operand 4 states. [2019-10-13 23:27:07,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:07,102 INFO L93 Difference]: Finished difference Result 644 states and 902 transitions. [2019-10-13 23:27:07,103 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 23:27:07,103 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 123 [2019-10-13 23:27:07,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:07,110 INFO L225 Difference]: With dead ends: 644 [2019-10-13 23:27:07,110 INFO L226 Difference]: Without dead ends: 410 [2019-10-13 23:27:07,113 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-13 23:27:07,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2019-10-13 23:27:07,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 371. [2019-10-13 23:27:07,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 371 states. [2019-10-13 23:27:07,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 371 states to 371 states and 523 transitions. [2019-10-13 23:27:07,186 INFO L78 Accepts]: Start accepts. Automaton has 371 states and 523 transitions. Word has length 123 [2019-10-13 23:27:07,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:07,187 INFO L462 AbstractCegarLoop]: Abstraction has 371 states and 523 transitions. [2019-10-13 23:27:07,188 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 23:27:07,188 INFO L276 IsEmpty]: Start isEmpty. Operand 371 states and 523 transitions. [2019-10-13 23:27:07,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2019-10-13 23:27:07,199 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:07,199 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, 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] [2019-10-13 23:27:07,200 INFO L410 AbstractCegarLoop]: === Iteration 3 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:07,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:07,200 INFO L82 PathProgramCache]: Analyzing trace with hash -1563024248, now seen corresponding path program 1 times [2019-10-13 23:27:07,201 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:07,201 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [36640401] [2019-10-13 23:27:07,201 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:07,201 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:07,202 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:07,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:07,389 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 9 proven. 10 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2019-10-13 23:27:07,390 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [36640401] [2019-10-13 23:27:07,390 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2043945091] [2019-10-13 23:27:07,390 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 23:27:07,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:07,574 INFO L256 TraceCheckSpWp]: Trace formula consists of 988 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-13 23:27:07,588 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 23:27:07,644 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 72 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-13 23:27:07,644 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 23:27:07,933 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 21 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-10-13 23:27:07,934 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-13 23:27:07,934 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3, 4] imperfect sequences [6] total 7 [2019-10-13 23:27:07,934 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462611291] [2019-10-13 23:27:07,936 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 23:27:07,936 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:07,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 23:27:07,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2019-10-13 23:27:07,937 INFO L87 Difference]: Start difference. First operand 371 states and 523 transitions. Second operand 4 states. [2019-10-13 23:27:08,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:08,211 INFO L93 Difference]: Finished difference Result 1065 states and 1644 transitions. [2019-10-13 23:27:08,211 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 23:27:08,212 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 164 [2019-10-13 23:27:08,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:08,223 INFO L225 Difference]: With dead ends: 1065 [2019-10-13 23:27:08,224 INFO L226 Difference]: Without dead ends: 710 [2019-10-13 23:27:08,226 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 329 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 23:27:08,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 710 states. [2019-10-13 23:27:08,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 710 to 688. [2019-10-13 23:27:08,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 688 states. [2019-10-13 23:27:08,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 688 states to 688 states and 961 transitions. [2019-10-13 23:27:08,324 INFO L78 Accepts]: Start accepts. Automaton has 688 states and 961 transitions. Word has length 164 [2019-10-13 23:27:08,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:08,326 INFO L462 AbstractCegarLoop]: Abstraction has 688 states and 961 transitions. [2019-10-13 23:27:08,326 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 23:27:08,326 INFO L276 IsEmpty]: Start isEmpty. Operand 688 states and 961 transitions. [2019-10-13 23:27:08,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2019-10-13 23:27:08,338 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:08,339 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, 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] [2019-10-13 23:27:08,551 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:08,552 INFO L410 AbstractCegarLoop]: === Iteration 4 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:08,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:08,553 INFO L82 PathProgramCache]: Analyzing trace with hash -897899996, now seen corresponding path program 1 times [2019-10-13 23:27:08,553 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:08,555 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [915151228] [2019-10-13 23:27:08,555 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:08,555 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:08,555 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:08,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:08,748 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 9 proven. 14 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2019-10-13 23:27:08,748 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [915151228] [2019-10-13 23:27:08,748 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1404643266] [2019-10-13 23:27:08,748 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 23:27:08,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:08,923 INFO L256 TraceCheckSpWp]: Trace formula consists of 988 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-13 23:27:08,930 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 23:27:08,962 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 72 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-13 23:27:08,963 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 23:27:09,171 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2019-10-13 23:27:09,171 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-13 23:27:09,172 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3, 4] imperfect sequences [6] total 7 [2019-10-13 23:27:09,172 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469431957] [2019-10-13 23:27:09,173 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 23:27:09,173 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:09,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 23:27:09,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2019-10-13 23:27:09,174 INFO L87 Difference]: Start difference. First operand 688 states and 961 transitions. Second operand 4 states. [2019-10-13 23:27:09,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:09,493 INFO L93 Difference]: Finished difference Result 2001 states and 3052 transitions. [2019-10-13 23:27:09,493 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 23:27:09,494 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 164 [2019-10-13 23:27:09,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:09,504 INFO L225 Difference]: With dead ends: 2001 [2019-10-13 23:27:09,504 INFO L226 Difference]: Without dead ends: 1329 [2019-10-13 23:27:09,509 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 329 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 23:27:09,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1329 states. [2019-10-13 23:27:09,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1329 to 1299. [2019-10-13 23:27:09,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1299 states. [2019-10-13 23:27:09,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1299 states to 1299 states and 1793 transitions. [2019-10-13 23:27:09,602 INFO L78 Accepts]: Start accepts. Automaton has 1299 states and 1793 transitions. Word has length 164 [2019-10-13 23:27:09,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:09,603 INFO L462 AbstractCegarLoop]: Abstraction has 1299 states and 1793 transitions. [2019-10-13 23:27:09,604 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 23:27:09,605 INFO L276 IsEmpty]: Start isEmpty. Operand 1299 states and 1793 transitions. [2019-10-13 23:27:09,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2019-10-13 23:27:09,610 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:09,611 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, 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] [2019-10-13 23:27:09,824 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:09,825 INFO L410 AbstractCegarLoop]: === Iteration 5 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:09,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:09,826 INFO L82 PathProgramCache]: Analyzing trace with hash -621454025, now seen corresponding path program 1 times [2019-10-13 23:27:09,826 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:09,827 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1469948494] [2019-10-13 23:27:09,827 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:09,827 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:09,827 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:09,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:09,955 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 9 proven. 18 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2019-10-13 23:27:09,955 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1469948494] [2019-10-13 23:27:09,956 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [394882408] [2019-10-13 23:27:09,956 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 23:27:10,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:10,151 INFO L256 TraceCheckSpWp]: Trace formula consists of 988 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-13 23:27:10,163 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 23:27:10,256 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 72 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-13 23:27:10,258 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 23:27:10,429 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2019-10-13 23:27:10,430 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-13 23:27:10,431 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3, 4] imperfect sequences [6] total 7 [2019-10-13 23:27:10,431 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679975173] [2019-10-13 23:27:10,432 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 23:27:10,432 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:10,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 23:27:10,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2019-10-13 23:27:10,433 INFO L87 Difference]: Start difference. First operand 1299 states and 1793 transitions. Second operand 4 states. [2019-10-13 23:27:10,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:10,773 INFO L93 Difference]: Finished difference Result 3803 states and 5732 transitions. [2019-10-13 23:27:10,774 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 23:27:10,775 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 164 [2019-10-13 23:27:10,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:10,793 INFO L225 Difference]: With dead ends: 3803 [2019-10-13 23:27:10,794 INFO L226 Difference]: Without dead ends: 2520 [2019-10-13 23:27:10,806 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 329 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 23:27:10,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2520 states. [2019-10-13 23:27:10,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2520 to 2474. [2019-10-13 23:27:10,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2474 states. [2019-10-13 23:27:11,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2474 states to 2474 states and 3375 transitions. [2019-10-13 23:27:11,021 INFO L78 Accepts]: Start accepts. Automaton has 2474 states and 3375 transitions. Word has length 164 [2019-10-13 23:27:11,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:11,023 INFO L462 AbstractCegarLoop]: Abstraction has 2474 states and 3375 transitions. [2019-10-13 23:27:11,024 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 23:27:11,024 INFO L276 IsEmpty]: Start isEmpty. Operand 2474 states and 3375 transitions. [2019-10-13 23:27:11,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2019-10-13 23:27:11,044 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:11,044 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, 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 23:27:11,250 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:11,250 INFO L410 AbstractCegarLoop]: === Iteration 6 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:11,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:11,251 INFO L82 PathProgramCache]: Analyzing trace with hash -1658173048, now seen corresponding path program 1 times [2019-10-13 23:27:11,251 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:11,252 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [12079769] [2019-10-13 23:27:11,252 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:11,252 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:11,252 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:11,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:11,475 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 21 proven. 6 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2019-10-13 23:27:11,476 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [12079769] [2019-10-13 23:27:11,476 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [59515225] [2019-10-13 23:27:11,476 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 23:27:11,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:11,668 INFO L256 TraceCheckSpWp]: Trace formula consists of 1053 conjuncts, 2 conjunts are in the unsatisfiable core [2019-10-13 23:27:11,673 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 23:27:11,725 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 92 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-13 23:27:11,725 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 23:27:11,883 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 24 proven. 1 refuted. 0 times theorem prover too weak. 97 trivial. 0 not checked. [2019-10-13 23:27:11,884 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-13 23:27:11,884 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8, 3] total 10 [2019-10-13 23:27:11,884 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [977904906] [2019-10-13 23:27:11,885 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-13 23:27:11,885 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:11,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-13 23:27:11,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2019-10-13 23:27:11,886 INFO L87 Difference]: Start difference. First operand 2474 states and 3375 transitions. Second operand 3 states. [2019-10-13 23:27:12,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:12,113 INFO L93 Difference]: Finished difference Result 4601 states and 6428 transitions. [2019-10-13 23:27:12,113 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 23:27:12,113 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 179 [2019-10-13 23:27:12,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:12,133 INFO L225 Difference]: With dead ends: 4601 [2019-10-13 23:27:12,133 INFO L226 Difference]: Without dead ends: 3377 [2019-10-13 23:27:12,142 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 365 GetRequests, 357 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2019-10-13 23:27:12,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3377 states. [2019-10-13 23:27:12,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3377 to 2834. [2019-10-13 23:27:12,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2834 states. [2019-10-13 23:27:12,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2834 states to 2834 states and 3885 transitions. [2019-10-13 23:27:12,374 INFO L78 Accepts]: Start accepts. Automaton has 2834 states and 3885 transitions. Word has length 179 [2019-10-13 23:27:12,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:12,376 INFO L462 AbstractCegarLoop]: Abstraction has 2834 states and 3885 transitions. [2019-10-13 23:27:12,376 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-13 23:27:12,376 INFO L276 IsEmpty]: Start isEmpty. Operand 2834 states and 3885 transitions. [2019-10-13 23:27:12,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2019-10-13 23:27:12,394 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:12,395 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 23:27:12,600 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:12,600 INFO L410 AbstractCegarLoop]: === Iteration 7 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:12,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:12,601 INFO L82 PathProgramCache]: Analyzing trace with hash -1797323528, now seen corresponding path program 1 times [2019-10-13 23:27:12,601 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:12,602 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1010954127] [2019-10-13 23:27:12,602 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:12,602 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:12,602 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:12,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:12,822 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 45 proven. 27 refuted. 0 times theorem prover too weak. 183 trivial. 0 not checked. [2019-10-13 23:27:12,822 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1010954127] [2019-10-13 23:27:12,823 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [974121505] [2019-10-13 23:27:12,824 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 23:27:13,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:13,179 INFO L256 TraceCheckSpWp]: Trace formula consists of 1352 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-13 23:27:13,192 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 23:27:13,419 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 208 proven. 0 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2019-10-13 23:27:13,419 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 23:27:13,774 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 48 proven. 8 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2019-10-13 23:27:13,775 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-13 23:27:13,775 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7, 4] total 12 [2019-10-13 23:27:13,775 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [935579090] [2019-10-13 23:27:13,776 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-13 23:27:13,776 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:13,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-13 23:27:13,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2019-10-13 23:27:13,777 INFO L87 Difference]: Start difference. First operand 2834 states and 3885 transitions. Second operand 6 states. [2019-10-13 23:27:14,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:14,484 INFO L93 Difference]: Finished difference Result 4554 states and 6425 transitions. [2019-10-13 23:27:14,485 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-13 23:27:14,485 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 246 [2019-10-13 23:27:14,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:14,507 INFO L225 Difference]: With dead ends: 4554 [2019-10-13 23:27:14,507 INFO L226 Difference]: Without dead ends: 3177 [2019-10-13 23:27:14,522 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 507 GetRequests, 494 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 23:27:14,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3177 states. [2019-10-13 23:27:14,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3177 to 3177. [2019-10-13 23:27:14,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3177 states. [2019-10-13 23:27:14,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3177 states to 3177 states and 4246 transitions. [2019-10-13 23:27:14,745 INFO L78 Accepts]: Start accepts. Automaton has 3177 states and 4246 transitions. Word has length 246 [2019-10-13 23:27:14,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:14,747 INFO L462 AbstractCegarLoop]: Abstraction has 3177 states and 4246 transitions. [2019-10-13 23:27:14,747 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-13 23:27:14,747 INFO L276 IsEmpty]: Start isEmpty. Operand 3177 states and 4246 transitions. [2019-10-13 23:27:14,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2019-10-13 23:27:14,761 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:14,761 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, 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 23:27:14,967 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:14,967 INFO L410 AbstractCegarLoop]: === Iteration 8 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:14,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:14,976 INFO L82 PathProgramCache]: Analyzing trace with hash -1376038240, now seen corresponding path program 1 times [2019-10-13 23:27:14,976 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:14,977 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [155083212] [2019-10-13 23:27:14,978 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:14,978 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:14,978 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:15,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:15,148 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 23 proven. 4 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2019-10-13 23:27:15,149 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [155083212] [2019-10-13 23:27:15,150 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [979561927] [2019-10-13 23:27:15,150 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 23:27:15,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:15,373 INFO L256 TraceCheckSpWp]: Trace formula consists of 1053 conjuncts, 2 conjunts are in the unsatisfiable core [2019-10-13 23:27:15,378 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 23:27:15,407 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 88 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2019-10-13 23:27:15,408 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 23:27:15,588 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 41 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-10-13 23:27:15,588 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-13 23:27:15,588 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3, 4] imperfect sequences [8] total 10 [2019-10-13 23:27:15,588 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [582689658] [2019-10-13 23:27:15,589 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 23:27:15,589 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:15,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 23:27:15,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2019-10-13 23:27:15,590 INFO L87 Difference]: Start difference. First operand 3177 states and 4246 transitions. Second operand 4 states. [2019-10-13 23:27:15,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:15,940 INFO L93 Difference]: Finished difference Result 5429 states and 7337 transitions. [2019-10-13 23:27:15,941 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 23:27:15,941 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 179 [2019-10-13 23:27:15,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:15,970 INFO L225 Difference]: With dead ends: 5429 [2019-10-13 23:27:15,971 INFO L226 Difference]: Without dead ends: 3725 [2019-10-13 23:27:15,992 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 365 GetRequests, 351 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2019-10-13 23:27:15,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3725 states. [2019-10-13 23:27:16,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3725 to 3725. [2019-10-13 23:27:16,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3725 states. [2019-10-13 23:27:16,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3725 states to 3725 states and 4808 transitions. [2019-10-13 23:27:16,299 INFO L78 Accepts]: Start accepts. Automaton has 3725 states and 4808 transitions. Word has length 179 [2019-10-13 23:27:16,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:16,299 INFO L462 AbstractCegarLoop]: Abstraction has 3725 states and 4808 transitions. [2019-10-13 23:27:16,300 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 23:27:16,300 INFO L276 IsEmpty]: Start isEmpty. Operand 3725 states and 4808 transitions. [2019-10-13 23:27:16,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2019-10-13 23:27:16,318 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:16,319 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 23:27:16,524 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:16,525 INFO L410 AbstractCegarLoop]: === Iteration 9 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:16,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:16,526 INFO L82 PathProgramCache]: Analyzing trace with hash -274662592, now seen corresponding path program 1 times [2019-10-13 23:27:16,526 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:16,526 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1915548489] [2019-10-13 23:27:16,527 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:16,527 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:16,527 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:16,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:16,769 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 45 proven. 27 refuted. 0 times theorem prover too weak. 183 trivial. 0 not checked. [2019-10-13 23:27:16,769 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1915548489] [2019-10-13 23:27:16,769 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1696929894] [2019-10-13 23:27:16,770 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 23:27:17,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:17,141 INFO L256 TraceCheckSpWp]: Trace formula consists of 1352 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-13 23:27:17,148 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 23:27:17,258 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 208 proven. 0 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2019-10-13 23:27:17,259 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 23:27:17,612 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 44 proven. 6 refuted. 0 times theorem prover too weak. 205 trivial. 0 not checked. [2019-10-13 23:27:17,612 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-13 23:27:17,613 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7, 4] total 12 [2019-10-13 23:27:17,613 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440757956] [2019-10-13 23:27:17,617 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-13 23:27:17,617 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:17,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-13 23:27:17,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2019-10-13 23:27:17,618 INFO L87 Difference]: Start difference. First operand 3725 states and 4808 transitions. Second operand 6 states. [2019-10-13 23:27:18,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:18,191 INFO L93 Difference]: Finished difference Result 6021 states and 7999 transitions. [2019-10-13 23:27:18,192 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-13 23:27:18,192 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 246 [2019-10-13 23:27:18,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:18,216 INFO L225 Difference]: With dead ends: 6021 [2019-10-13 23:27:18,216 INFO L226 Difference]: Without dead ends: 4055 [2019-10-13 23:27:18,232 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 507 GetRequests, 494 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 23:27:18,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4055 states. [2019-10-13 23:27:18,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4055 to 4055. [2019-10-13 23:27:18,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4055 states. [2019-10-13 23:27:18,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4055 states to 4055 states and 5128 transitions. [2019-10-13 23:27:18,606 INFO L78 Accepts]: Start accepts. Automaton has 4055 states and 5128 transitions. Word has length 246 [2019-10-13 23:27:18,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:18,607 INFO L462 AbstractCegarLoop]: Abstraction has 4055 states and 5128 transitions. [2019-10-13 23:27:18,607 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-13 23:27:18,607 INFO L276 IsEmpty]: Start isEmpty. Operand 4055 states and 5128 transitions. [2019-10-13 23:27:18,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2019-10-13 23:27:18,624 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:18,624 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, 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 23:27:18,837 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:18,838 INFO L410 AbstractCegarLoop]: === Iteration 10 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:18,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:18,838 INFO L82 PathProgramCache]: Analyzing trace with hash -184206936, now seen corresponding path program 1 times [2019-10-13 23:27:18,838 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:18,839 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1006317452] [2019-10-13 23:27:18,839 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:18,839 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:18,839 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:18,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:19,059 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 22 proven. 5 refuted. 0 times theorem prover too weak. 97 trivial. 0 not checked. [2019-10-13 23:27:19,059 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1006317452] [2019-10-13 23:27:19,060 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1224825775] [2019-10-13 23:27:19,060 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 23:27:19,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:19,508 INFO L256 TraceCheckSpWp]: Trace formula consists of 1052 conjuncts, 2 conjunts are in the unsatisfiable core [2019-10-13 23:27:19,513 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 23:27:19,567 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 94 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-13 23:27:19,567 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 23:27:19,723 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 24 proven. 1 refuted. 0 times theorem prover too weak. 99 trivial. 0 not checked. [2019-10-13 23:27:19,724 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-13 23:27:19,724 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8, 3] total 10 [2019-10-13 23:27:19,724 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607322011] [2019-10-13 23:27:19,725 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-13 23:27:19,725 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:19,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-13 23:27:19,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2019-10-13 23:27:19,726 INFO L87 Difference]: Start difference. First operand 4055 states and 5128 transitions. Second operand 3 states. [2019-10-13 23:27:19,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:19,982 INFO L93 Difference]: Finished difference Result 7505 states and 9686 transitions. [2019-10-13 23:27:19,982 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 23:27:19,982 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 180 [2019-10-13 23:27:19,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:20,019 INFO L225 Difference]: With dead ends: 7505 [2019-10-13 23:27:20,020 INFO L226 Difference]: Without dead ends: 5358 [2019-10-13 23:27:20,039 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 367 GetRequests, 359 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 23:27:20,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5358 states. [2019-10-13 23:27:20,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5358 to 4558. [2019-10-13 23:27:20,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4558 states. [2019-10-13 23:27:20,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4558 states to 4558 states and 5828 transitions. [2019-10-13 23:27:20,398 INFO L78 Accepts]: Start accepts. Automaton has 4558 states and 5828 transitions. Word has length 180 [2019-10-13 23:27:20,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:20,399 INFO L462 AbstractCegarLoop]: Abstraction has 4558 states and 5828 transitions. [2019-10-13 23:27:20,399 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-13 23:27:20,399 INFO L276 IsEmpty]: Start isEmpty. Operand 4558 states and 5828 transitions. [2019-10-13 23:27:20,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2019-10-13 23:27:20,419 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:20,420 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, 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 23:27:20,624 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:20,625 INFO L410 AbstractCegarLoop]: === Iteration 11 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:20,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:20,625 INFO L82 PathProgramCache]: Analyzing trace with hash -590445688, now seen corresponding path program 1 times [2019-10-13 23:27:20,626 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:20,626 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1373732958] [2019-10-13 23:27:20,626 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:20,626 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:20,626 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:20,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:20,791 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 23 proven. 4 refuted. 0 times theorem prover too weak. 97 trivial. 0 not checked. [2019-10-13 23:27:20,792 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1373732958] [2019-10-13 23:27:20,792 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1735031856] [2019-10-13 23:27:20,792 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 23:27:21,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:21,163 INFO L256 TraceCheckSpWp]: Trace formula consists of 1052 conjuncts, 2 conjunts are in the unsatisfiable core [2019-10-13 23:27:21,168 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 23:27:21,203 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 94 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-13 23:27:21,203 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 23:27:21,366 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 24 proven. 1 refuted. 0 times theorem prover too weak. 99 trivial. 0 not checked. [2019-10-13 23:27:21,366 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-13 23:27:21,366 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8, 3] total 10 [2019-10-13 23:27:21,367 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197637483] [2019-10-13 23:27:21,368 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-13 23:27:21,369 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:21,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-13 23:27:21,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2019-10-13 23:27:21,369 INFO L87 Difference]: Start difference. First operand 4558 states and 5828 transitions. Second operand 3 states. [2019-10-13 23:27:21,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:21,717 INFO L93 Difference]: Finished difference Result 8271 states and 10832 transitions. [2019-10-13 23:27:21,718 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 23:27:21,718 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 180 [2019-10-13 23:27:21,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:21,769 INFO L225 Difference]: With dead ends: 8271 [2019-10-13 23:27:21,769 INFO L226 Difference]: Without dead ends: 5910 [2019-10-13 23:27:21,792 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 367 GetRequests, 359 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 23:27:21,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5910 states. [2019-10-13 23:27:22,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5910 to 5258. [2019-10-13 23:27:22,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5258 states. [2019-10-13 23:27:22,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5258 states to 5258 states and 6782 transitions. [2019-10-13 23:27:22,163 INFO L78 Accepts]: Start accepts. Automaton has 5258 states and 6782 transitions. Word has length 180 [2019-10-13 23:27:22,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:22,165 INFO L462 AbstractCegarLoop]: Abstraction has 5258 states and 6782 transitions. [2019-10-13 23:27:22,165 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-13 23:27:22,166 INFO L276 IsEmpty]: Start isEmpty. Operand 5258 states and 6782 transitions. [2019-10-13 23:27:22,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2019-10-13 23:27:22,185 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:22,186 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, 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] [2019-10-13 23:27:22,391 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:22,391 INFO L410 AbstractCegarLoop]: === Iteration 12 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:22,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:22,392 INFO L82 PathProgramCache]: Analyzing trace with hash -1740688795, now seen corresponding path program 1 times [2019-10-13 23:27:22,392 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:22,392 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1743542969] [2019-10-13 23:27:22,393 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:22,393 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:22,393 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:22,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:22,546 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 38 proven. 16 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2019-10-13 23:27:22,547 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1743542969] [2019-10-13 23:27:22,547 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1181091721] [2019-10-13 23:27:22,548 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 23:27:22,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:22,822 INFO L256 TraceCheckSpWp]: Trace formula consists of 1061 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-13 23:27:22,829 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 23:27:23,029 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 76 proven. 0 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2019-10-13 23:27:23,029 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 23:27:23,219 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 23:27:23,325 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 23:27:23,326 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 23:27:23,346 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 23:27:23,379 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 15 proven. 20 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2019-10-13 23:27:23,379 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-13 23:27:23,379 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [9, 7] total 19 [2019-10-13 23:27:23,380 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950969167] [2019-10-13 23:27:23,381 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-13 23:27:23,385 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:23,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-13 23:27:23,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2019-10-13 23:27:23,386 INFO L87 Difference]: Start difference. First operand 5258 states and 6782 transitions. Second operand 9 states. [2019-10-13 23:27:24,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:24,635 INFO L93 Difference]: Finished difference Result 13378 states and 18438 transitions. [2019-10-13 23:27:24,635 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-13 23:27:24,635 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 182 [2019-10-13 23:27:24,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:24,685 INFO L225 Difference]: With dead ends: 13378 [2019-10-13 23:27:24,685 INFO L226 Difference]: Without dead ends: 8137 [2019-10-13 23:27:24,711 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 387 GetRequests, 361 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=150, Invalid=606, Unknown=0, NotChecked=0, Total=756 [2019-10-13 23:27:24,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8137 states. [2019-10-13 23:27:25,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8137 to 7953. [2019-10-13 23:27:25,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7953 states. [2019-10-13 23:27:25,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7953 states to 7953 states and 10692 transitions. [2019-10-13 23:27:25,390 INFO L78 Accepts]: Start accepts. Automaton has 7953 states and 10692 transitions. Word has length 182 [2019-10-13 23:27:25,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:25,391 INFO L462 AbstractCegarLoop]: Abstraction has 7953 states and 10692 transitions. [2019-10-13 23:27:25,391 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-13 23:27:25,391 INFO L276 IsEmpty]: Start isEmpty. Operand 7953 states and 10692 transitions. [2019-10-13 23:27:25,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2019-10-13 23:27:25,418 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:25,419 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, 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] [2019-10-13 23:27:25,624 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:25,625 INFO L410 AbstractCegarLoop]: === Iteration 13 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:25,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:25,625 INFO L82 PathProgramCache]: Analyzing trace with hash -985563667, now seen corresponding path program 1 times [2019-10-13 23:27:25,625 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:25,626 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [365432430] [2019-10-13 23:27:25,626 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:25,626 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:25,626 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:25,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:25,758 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 41 proven. 0 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2019-10-13 23:27:25,758 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [365432430] [2019-10-13 23:27:25,759 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 23:27:25,759 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-13 23:27:25,759 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976557706] [2019-10-13 23:27:25,760 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 23:27:25,760 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:25,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 23:27:25,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 23:27:25,761 INFO L87 Difference]: Start difference. First operand 7953 states and 10692 transitions. Second operand 4 states. [2019-10-13 23:27:26,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:26,546 INFO L93 Difference]: Finished difference Result 16968 states and 23439 transitions. [2019-10-13 23:27:26,546 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 23:27:26,546 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 181 [2019-10-13 23:27:26,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:26,596 INFO L225 Difference]: With dead ends: 16968 [2019-10-13 23:27:26,597 INFO L226 Difference]: Without dead ends: 9032 [2019-10-13 23:27:26,649 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 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 23:27:26,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9032 states. [2019-10-13 23:27:27,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9032 to 9008. [2019-10-13 23:27:27,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9008 states. [2019-10-13 23:27:27,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9008 states to 9008 states and 11775 transitions. [2019-10-13 23:27:27,441 INFO L78 Accepts]: Start accepts. Automaton has 9008 states and 11775 transitions. Word has length 181 [2019-10-13 23:27:27,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:27,441 INFO L462 AbstractCegarLoop]: Abstraction has 9008 states and 11775 transitions. [2019-10-13 23:27:27,441 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 23:27:27,442 INFO L276 IsEmpty]: Start isEmpty. Operand 9008 states and 11775 transitions. [2019-10-13 23:27:27,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2019-10-13 23:27:27,467 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:27,468 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, 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] [2019-10-13 23:27:27,468 INFO L410 AbstractCegarLoop]: === Iteration 14 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:27,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:27,468 INFO L82 PathProgramCache]: Analyzing trace with hash 2076149021, now seen corresponding path program 1 times [2019-10-13 23:27:27,469 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:27,469 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1949171060] [2019-10-13 23:27:27,469 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:27,469 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:27,469 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:27,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:27,598 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 39 proven. 16 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2019-10-13 23:27:27,598 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1949171060] [2019-10-13 23:27:27,599 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [687440284] [2019-10-13 23:27:27,599 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 23:27:27,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:27,873 INFO L256 TraceCheckSpWp]: Trace formula consists of 1075 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-13 23:27:27,886 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 23:27:28,020 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 78 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2019-10-13 23:27:28,020 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 23:27:28,204 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 23:27:28,305 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 23:27:28,305 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 23:27:28,324 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 23:27:28,354 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 17 proven. 20 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2019-10-13 23:27:28,355 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-13 23:27:28,355 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [9, 7] total 19 [2019-10-13 23:27:28,355 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353849946] [2019-10-13 23:27:28,356 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-13 23:27:28,356 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-13 23:27:28,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-13 23:27:28,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2019-10-13 23:27:28,357 INFO L87 Difference]: Start difference. First operand 9008 states and 11775 transitions. Second operand 9 states. [2019-10-13 23:27:30,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 23:27:30,594 INFO L93 Difference]: Finished difference Result 22785 states and 32745 transitions. [2019-10-13 23:27:30,595 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-13 23:27:30,595 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 184 [2019-10-13 23:27:30,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 23:27:30,661 INFO L225 Difference]: With dead ends: 22785 [2019-10-13 23:27:30,661 INFO L226 Difference]: Without dead ends: 13794 [2019-10-13 23:27:30,717 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 365 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=150, Invalid=606, Unknown=0, NotChecked=0, Total=756 [2019-10-13 23:27:30,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13794 states. [2019-10-13 23:27:31,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13794 to 13550. [2019-10-13 23:27:31,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13550 states. [2019-10-13 23:27:31,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13550 states to 13550 states and 18679 transitions. [2019-10-13 23:27:31,702 INFO L78 Accepts]: Start accepts. Automaton has 13550 states and 18679 transitions. Word has length 184 [2019-10-13 23:27:31,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 23:27:31,702 INFO L462 AbstractCegarLoop]: Abstraction has 13550 states and 18679 transitions. [2019-10-13 23:27:31,703 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-13 23:27:31,703 INFO L276 IsEmpty]: Start isEmpty. Operand 13550 states and 18679 transitions. [2019-10-13 23:27:31,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 254 [2019-10-13 23:27:31,740 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 23:27:31,740 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, 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, 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 23:27:31,945 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 23:27:31,945 INFO L410 AbstractCegarLoop]: === Iteration 15 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 23:27:31,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 23:27:31,945 INFO L82 PathProgramCache]: Analyzing trace with hash -242898162, now seen corresponding path program 1 times [2019-10-13 23:27:31,946 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-13 23:27:31,946 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [129244161] [2019-10-13 23:27:31,946 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:31,947 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 23:27:31,947 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 23:27:31,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:32,365 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 31 proven. 26 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2019-10-13 23:27:32,365 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [129244161] [2019-10-13 23:27:32,366 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [568374272] [2019-10-13 23:27:32,366 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 23:27:32,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 23:27:32,756 INFO L256 TraceCheckSpWp]: Trace formula consists of 1377 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-13 23:27:32,764 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 23:27:32,953 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 142 proven. 4 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2019-10-13 23:27:32,954 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 23:27:33,170 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 23:27:33,263 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 23:27:33,263 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 23:27:33,286 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 23:27:33,332 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 34 proven. 30 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2019-10-13 23:27:33,332 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1868432279] [2019-10-13 23:27:33,365 INFO L162 IcfgInterpreter]: Started Sifa with 113 locations of interest [2019-10-13 23:27:33,365 INFO L169 IcfgInterpreter]: Building call graph [2019-10-13 23:27:33,372 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-13 23:27:33,378 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-13 23:27:33,378 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-13 23:27:33,684 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 67 for LOIs [2019-10-13 23:27:33,752 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 113 for LOIs [2019-10-13 23:27:34,515 INFO L199 IcfgInterpreter]: Interpreting procedure init_model with input of size 69 for LOIs [2019-10-13 23:27:34,595 INFO L199 IcfgInterpreter]: Interpreting procedure start_simulation with input of size 122 for LOIs