/usr/bin/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 --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --rcfgbuilder.size.of.a.code.block SingleStatement --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options produce-proofs=true --traceabstraction.additional.smt.options produce-unsat-cores=true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.2 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.3.1.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-c90d42b [2020-09-25 11:27:04,663 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-25 11:27:04,667 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-25 11:27:04,711 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-25 11:27:04,712 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-25 11:27:04,723 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-25 11:27:04,725 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-25 11:27:04,728 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-25 11:27:04,731 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-25 11:27:04,732 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-25 11:27:04,733 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-25 11:27:04,734 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-25 11:27:04,734 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-25 11:27:04,739 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-25 11:27:04,742 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-25 11:27:04,744 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-25 11:27:04,746 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-25 11:27:04,747 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-25 11:27:04,749 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-25 11:27:04,754 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-25 11:27:04,757 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-25 11:27:04,758 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-25 11:27:04,759 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-25 11:27:04,760 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-25 11:27:04,764 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-25 11:27:04,765 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-25 11:27:04,765 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-25 11:27:04,767 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-25 11:27:04,768 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-25 11:27:04,770 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-25 11:27:04,770 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-25 11:27:04,771 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-25 11:27:04,772 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-25 11:27:04,773 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-25 11:27:04,775 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-25 11:27:04,775 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-25 11:27:04,776 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-25 11:27:04,776 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-25 11:27:04,776 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-25 11:27:04,777 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-25 11:27:04,779 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-25 11:27:04,779 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-09-25 11:27:04,829 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-25 11:27:04,829 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-25 11:27:04,832 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-25 11:27:04,832 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-25 11:27:04,832 INFO L138 SettingsManager]: * Use SBE=true [2020-09-25 11:27:04,832 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-25 11:27:04,833 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-25 11:27:04,833 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-25 11:27:04,833 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-25 11:27:04,833 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-25 11:27:04,834 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-25 11:27:04,835 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-25 11:27:04,835 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-25 11:27:04,835 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-25 11:27:04,836 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-25 11:27:04,836 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-25 11:27:04,836 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-25 11:27:04,836 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-25 11:27:04,837 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-25 11:27:04,837 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-25 11:27:04,837 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-25 11:27:04,837 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-25 11:27:04,838 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-25 11:27:04,838 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-25 11:27:04,838 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-25 11:27:04,838 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-25 11:27:04,838 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-25 11:27:04,839 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-25 11:27:04,839 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-25 11:27:04,839 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SingleStatement Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.2;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.2;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.2;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.2;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.2;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.2;log-additional-information=true; [2020-09-25 11:27:05,272 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-25 11:27:05,299 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-25 11:27:05,304 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-25 11:27:05,306 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-25 11:27:05,306 INFO L275 PluginConnector]: CDTParser initialized [2020-09-25 11:27:05,307 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.3.1.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c [2020-09-25 11:27:05,396 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/691e0134f/9d552103b7e44ded9938fc3280738ca8/FLAG256894d60 [2020-09-25 11:27:06,027 INFO L306 CDTParser]: Found 1 translation units. [2020-09-25 11:27:06,028 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.3.1.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c [2020-09-25 11:27:06,042 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/691e0134f/9d552103b7e44ded9938fc3280738ca8/FLAG256894d60 [2020-09-25 11:27:06,275 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/691e0134f/9d552103b7e44ded9938fc3280738ca8 [2020-09-25 11:27:06,290 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-25 11:27:06,298 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-25 11:27:06,299 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-25 11:27:06,300 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-25 11:27:06,304 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-25 11:27:06,305 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 11:27:06" (1/1) ... [2020-09-25 11:27:06,309 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@268d0111 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:27:06, skipping insertion in model container [2020-09-25 11:27:06,309 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 11:27:06" (1/1) ... [2020-09-25 11:27:06,318 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-25 11:27:06,409 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-25 11:27:07,170 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-25 11:27:07,191 INFO L203 MainTranslator]: Completed pre-run [2020-09-25 11:27:07,419 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-25 11:27:07,444 INFO L208 MainTranslator]: Completed translation [2020-09-25 11:27:07,445 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:27:07 WrapperNode [2020-09-25 11:27:07,445 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-25 11:27:07,446 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-25 11:27:07,446 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-25 11:27:07,446 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-25 11:27:07,464 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:27:07" (1/1) ... [2020-09-25 11:27:07,464 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:27:07" (1/1) ... [2020-09-25 11:27:07,485 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:27:07" (1/1) ... [2020-09-25 11:27:07,486 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:27:07" (1/1) ... [2020-09-25 11:27:07,518 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:27:07" (1/1) ... [2020-09-25 11:27:07,544 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:27:07" (1/1) ... [2020-09-25 11:27:07,549 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:27:07" (1/1) ... [2020-09-25 11:27:07,559 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-25 11:27:07,559 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-25 11:27:07,560 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-25 11:27:07,560 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-25 11:27:07,561 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:27:07" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-25 11:27:07,673 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-25 11:27:07,674 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-25 11:27:07,674 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-09-25 11:27:07,674 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-25 11:27:07,674 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-25 11:27:07,675 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-09-25 11:27:07,675 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-09-25 11:27:07,675 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-09-25 11:27:07,675 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-09-25 11:27:07,675 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-09-25 11:27:07,676 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-09-25 11:27:07,676 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-09-25 11:27:07,676 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-09-25 11:27:07,676 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-09-25 11:27:07,676 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-09-25 11:27:07,677 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-09-25 11:27:07,677 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-09-25 11:27:07,677 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-09-25 11:27:07,677 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-25 11:27:07,678 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-25 11:27:07,678 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-25 11:27:09,688 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-25 11:27:09,689 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-09-25 11:27:09,709 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.09 11:27:09 BoogieIcfgContainer [2020-09-25 11:27:09,710 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-25 11:27:09,712 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-25 11:27:09,712 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-25 11:27:09,716 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-25 11:27:09,716 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.09 11:27:06" (1/3) ... [2020-09-25 11:27:09,717 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b0771e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.09 11:27:09, skipping insertion in model container [2020-09-25 11:27:09,718 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:27:07" (2/3) ... [2020-09-25 11:27:09,718 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b0771e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.09 11:27:09, skipping insertion in model container [2020-09-25 11:27:09,718 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.09 11:27:09" (3/3) ... [2020-09-25 11:27:09,722 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_floodmax.3.1.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c [2020-09-25 11:27:09,733 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-25 11:27:09,747 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 5 error locations. [2020-09-25 11:27:09,769 INFO L251 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2020-09-25 11:27:09,809 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-25 11:27:09,810 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-25 11:27:09,810 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-25 11:27:09,810 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-25 11:27:09,810 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-25 11:27:09,810 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-25 11:27:09,811 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-25 11:27:09,811 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-25 11:27:09,852 INFO L276 IsEmpty]: Start isEmpty. Operand 1123 states. [2020-09-25 11:27:09,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 415 [2020-09-25 11:27:09,887 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 11:27:09,889 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-25 11:27:09,890 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr4ASSERT_VIOLATIONERROR_FUNCTION, mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr2ASSERT_VIOLATIONERROR_FUNCTION, mainErr3ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 11:27:09,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 11:27:09,898 INFO L82 PathProgramCache]: Analyzing trace with hash -1272027086, now seen corresponding path program 1 times [2020-09-25 11:27:09,910 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 11:27:09,911 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1857969855] [2020-09-25 11:27:09,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 11:27:10,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 11:27:10,741 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:11,132 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:11,420 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:11,748 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:11,960 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:12,153 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:12,536 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:12,878 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:15,461 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 11:27:15,461 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 421 [2020-09-25 11:27:15,462 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 8 [2020-09-25 11:27:15,462 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5018 [2020-09-25 11:27:15,465 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 11:27:15,466 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-09-25 11:27:15,466 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-09-25 11:27:15,466 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 199 [2020-09-25 11:27:15,466 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 188 [2020-09-25 11:27:15,467 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 4 [2020-09-25 11:27:16,025 WARN L193 SmtUtils]: Spent 250.00 ms on a formula simplification that was a NOOP. DAG size: 187 [2020-09-25 11:27:16,029 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 11:27:16,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 11:27:16,054 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:16,097 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 11:27:16,098 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 71 [2020-09-25 11:27:16,098 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 11:27:16,098 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 53 [2020-09-25 11:27:16,098 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 11:27:16,099 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-09-25 11:27:16,099 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 11:27:16,099 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 11:27:16,099 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 11:27:16,100 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 11:27:16,476 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-25 11:27:16,477 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1857969855] [2020-09-25 11:27:16,480 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-25 11:27:16,480 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-25 11:27:16,482 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568163042] [2020-09-25 11:27:16,500 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-25 11:27:16,502 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 11:27:16,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-25 11:27:16,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-25 11:27:16,529 INFO L87 Difference]: Start difference. First operand 1123 states. Second operand 4 states. [2020-09-25 11:27:20,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 11:27:20,975 INFO L93 Difference]: Finished difference Result 1830 states and 2374 transitions. [2020-09-25 11:27:20,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-25 11:27:20,978 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 414 [2020-09-25 11:27:20,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 11:27:21,019 INFO L225 Difference]: With dead ends: 1830 [2020-09-25 11:27:21,019 INFO L226 Difference]: Without dead ends: 1312 [2020-09-25 11:27:21,030 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-25 11:27:21,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1312 states. [2020-09-25 11:27:21,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1312 to 1303. [2020-09-25 11:27:21,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1303 states. [2020-09-25 11:27:21,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1303 states to 1303 states and 1563 transitions. [2020-09-25 11:27:21,201 INFO L78 Accepts]: Start accepts. Automaton has 1303 states and 1563 transitions. Word has length 414 [2020-09-25 11:27:21,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 11:27:21,207 INFO L479 AbstractCegarLoop]: Abstraction has 1303 states and 1563 transitions. [2020-09-25 11:27:21,207 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-25 11:27:21,208 INFO L276 IsEmpty]: Start isEmpty. Operand 1303 states and 1563 transitions. [2020-09-25 11:27:21,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 415 [2020-09-25 11:27:21,220 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 11:27:21,221 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-25 11:27:21,222 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-25 11:27:21,222 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr4ASSERT_VIOLATIONERROR_FUNCTION, mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr2ASSERT_VIOLATIONERROR_FUNCTION, mainErr3ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 11:27:21,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 11:27:21,223 INFO L82 PathProgramCache]: Analyzing trace with hash -1791071559, now seen corresponding path program 1 times [2020-09-25 11:27:21,223 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 11:27:21,224 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1554056585] [2020-09-25 11:27:21,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 11:27:21,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 11:27:21,472 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:21,680 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:21,824 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:21,958 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:22,083 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:22,208 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:22,532 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:22,815 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:26,373 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 11:27:26,373 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 421 [2020-09-25 11:27:26,374 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 8 [2020-09-25 11:27:26,375 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5033 [2020-09-25 11:27:26,376 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 11:27:26,376 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-09-25 11:27:26,376 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-09-25 11:27:26,377 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 167 [2020-09-25 11:27:26,377 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 110 [2020-09-25 11:27:26,386 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 10 [2020-09-25 11:27:27,041 WARN L193 SmtUtils]: Spent 294.00 ms on a formula simplification that was a NOOP. DAG size: 187 [2020-09-25 11:27:27,043 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 11:27:27,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 11:27:27,061 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:27,104 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 11:27:27,105 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 71 [2020-09-25 11:27:27,105 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 11:27:27,106 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 52 [2020-09-25 11:27:27,106 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 11:27:27,106 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-09-25 11:27:27,107 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 11:27:27,107 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 11:27:27,108 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 11:27:27,108 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 11:27:27,618 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-25 11:27:27,618 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1554056585] [2020-09-25 11:27:27,619 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-25 11:27:27,619 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-25 11:27:27,619 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620497461] [2020-09-25 11:27:27,622 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-25 11:27:27,622 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 11:27:27,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-25 11:27:27,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-25 11:27:27,623 INFO L87 Difference]: Start difference. First operand 1303 states and 1563 transitions. Second operand 5 states. [2020-09-25 11:27:33,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 11:27:33,788 INFO L93 Difference]: Finished difference Result 3465 states and 4205 transitions. [2020-09-25 11:27:33,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-25 11:27:33,788 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 414 [2020-09-25 11:27:33,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 11:27:33,800 INFO L225 Difference]: With dead ends: 3465 [2020-09-25 11:27:33,800 INFO L226 Difference]: Without dead ends: 2364 [2020-09-25 11:27:33,803 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-25 11:27:33,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2364 states. [2020-09-25 11:27:33,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2364 to 2239. [2020-09-25 11:27:33,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2239 states. [2020-09-25 11:27:33,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2239 states to 2239 states and 2723 transitions. [2020-09-25 11:27:33,883 INFO L78 Accepts]: Start accepts. Automaton has 2239 states and 2723 transitions. Word has length 414 [2020-09-25 11:27:33,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 11:27:33,884 INFO L479 AbstractCegarLoop]: Abstraction has 2239 states and 2723 transitions. [2020-09-25 11:27:33,884 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-25 11:27:33,884 INFO L276 IsEmpty]: Start isEmpty. Operand 2239 states and 2723 transitions. [2020-09-25 11:27:33,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 416 [2020-09-25 11:27:33,894 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 11:27:33,894 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-25 11:27:33,895 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-25 11:27:33,895 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr4ASSERT_VIOLATIONERROR_FUNCTION, mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr2ASSERT_VIOLATIONERROR_FUNCTION, mainErr3ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 11:27:33,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 11:27:33,896 INFO L82 PathProgramCache]: Analyzing trace with hash 129832887, now seen corresponding path program 1 times [2020-09-25 11:27:33,896 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 11:27:33,896 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2011118231] [2020-09-25 11:27:33,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 11:27:33,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 11:27:34,016 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:34,152 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:34,316 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:34,463 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:34,595 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:34,704 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:36,048 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:38,121 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:39,018 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 11:27:39,018 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 422 [2020-09-25 11:27:39,019 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 8 [2020-09-25 11:27:39,019 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5061 [2020-09-25 11:27:39,020 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 11:27:39,020 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-09-25 11:27:39,020 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-09-25 11:27:39,021 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 169 [2020-09-25 11:27:39,021 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 110 [2020-09-25 11:27:39,021 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 11:27:39,611 WARN L193 SmtUtils]: Spent 292.00 ms on a formula simplification that was a NOOP. DAG size: 187 [2020-09-25 11:27:39,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 11:27:39,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 11:27:39,631 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:39,675 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 11:27:39,676 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 71 [2020-09-25 11:27:39,676 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 11:27:39,677 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 53 [2020-09-25 11:27:39,677 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 11:27:39,677 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-09-25 11:27:39,678 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 11:27:39,678 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 11:27:39,679 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 11:27:39,679 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 11:27:40,203 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-25 11:27:40,204 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2011118231] [2020-09-25 11:27:40,205 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-25 11:27:40,205 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-25 11:27:40,206 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117007117] [2020-09-25 11:27:40,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-25 11:27:40,208 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 11:27:40,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-25 11:27:40,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-25 11:27:40,211 INFO L87 Difference]: Start difference. First operand 2239 states and 2723 transitions. Second operand 5 states. [2020-09-25 11:27:46,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 11:27:46,425 INFO L93 Difference]: Finished difference Result 6029 states and 7386 transitions. [2020-09-25 11:27:46,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-25 11:27:46,426 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 415 [2020-09-25 11:27:46,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 11:27:46,444 INFO L225 Difference]: With dead ends: 6029 [2020-09-25 11:27:46,444 INFO L226 Difference]: Without dead ends: 4178 [2020-09-25 11:27:46,449 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-25 11:27:46,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4178 states. [2020-09-25 11:27:46,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4178 to 4053. [2020-09-25 11:27:46,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4053 states. [2020-09-25 11:27:46,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4053 states to 4053 states and 4958 transitions. [2020-09-25 11:27:46,634 INFO L78 Accepts]: Start accepts. Automaton has 4053 states and 4958 transitions. Word has length 415 [2020-09-25 11:27:46,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 11:27:46,635 INFO L479 AbstractCegarLoop]: Abstraction has 4053 states and 4958 transitions. [2020-09-25 11:27:46,636 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-25 11:27:46,639 INFO L276 IsEmpty]: Start isEmpty. Operand 4053 states and 4958 transitions. [2020-09-25 11:27:46,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 417 [2020-09-25 11:27:46,646 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 11:27:46,647 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-25 11:27:46,647 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-25 11:27:46,648 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr4ASSERT_VIOLATIONERROR_FUNCTION, mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr2ASSERT_VIOLATIONERROR_FUNCTION, mainErr3ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 11:27:46,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 11:27:46,648 INFO L82 PathProgramCache]: Analyzing trace with hash -2007208563, now seen corresponding path program 1 times [2020-09-25 11:27:46,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 11:27:46,650 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1594892900] [2020-09-25 11:27:46,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 11:27:46,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 11:27:46,763 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:46,865 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:46,977 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:47,094 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:47,572 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:47,758 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:48,661 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:48,777 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:49,370 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:49,863 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:50,605 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:51,746 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 11:27:51,747 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 423 [2020-09-25 11:27:51,747 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 11 [2020-09-25 11:27:51,747 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5041 [2020-09-25 11:27:51,748 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 11:27:51,748 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-09-25 11:27:51,748 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-09-25 11:27:51,748 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 165 [2020-09-25 11:27:51,748 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 165 [2020-09-25 11:27:51,749 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 11:27:52,173 WARN L193 SmtUtils]: Spent 203.00 ms on a formula simplification that was a NOOP. DAG size: 187 [2020-09-25 11:27:52,174 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 11:27:52,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 11:27:52,190 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 11:27:52,229 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 11:27:52,229 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 71 [2020-09-25 11:27:52,229 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 11:27:52,230 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 47 [2020-09-25 11:27:52,230 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 11:27:52,230 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-09-25 11:27:52,230 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 11:27:52,231 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 11:27:52,231 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 11:27:52,231 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 11:27:52,587 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-25 11:27:52,588 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1594892900] [2020-09-25 11:27:52,588 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-25 11:27:52,589 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-25 11:27:52,589 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [695851765] [2020-09-25 11:27:52,590 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-25 11:27:52,590 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 11:27:52,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-25 11:27:52,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-25 11:27:52,591 INFO L87 Difference]: Start difference. First operand 4053 states and 4958 transitions. Second operand 5 states.