/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 --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=NARROWEST --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_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 21:33:15,757 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 21:33:15,760 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 21:33:15,799 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 21:33:15,800 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 21:33:15,808 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 21:33:15,810 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 21:33:15,814 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 21:33:15,817 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 21:33:15,822 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 21:33:15,823 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 21:33:15,824 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 21:33:15,825 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 21:33:15,828 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 21:33:15,830 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 21:33:15,832 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 21:33:15,834 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 21:33:15,835 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 21:33:15,836 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 21:33:15,844 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 21:33:15,846 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 21:33:15,847 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 21:33:15,848 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 21:33:15,849 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 21:33:15,861 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 21:33:15,861 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 21:33:15,861 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 21:33:15,862 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 21:33:15,863 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 21:33:15,864 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-21 21:33:15,869 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 21:33:15,870 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 21:33:15,871 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 21:33:15,872 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 [2020-08-21 21:33:15,911 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 21:33:15,911 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 21:33:15,914 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 21:33:15,914 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 21:33:15,914 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 21:33:15,914 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 21:33:15,915 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 21:33:15,915 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 21:33:15,915 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 21:33:15,915 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 21:33:15,916 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 21:33:15,916 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 21:33:15,917 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 21:33:15,917 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 21:33:15,917 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 21:33:15,917 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 21:33:15,918 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 21:33:15,918 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 21:33:15,918 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 21:33:15,918 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 21:33:15,918 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 21:33:15,919 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 21:33:15,919 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 21:33:15,919 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 21:33:15,919 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 21:33:15,919 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 21:33:15,920 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 21:33:15,920 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 21:33:15,920 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 21:33:15,920 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.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; [2020-08-21 21:33:16,252 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 21:33:16,267 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 21:33:16,270 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 21:33:16,272 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 21:33:16,272 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 21:33:16,273 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c [2020-08-21 21:33:16,343 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5d0bb12c9/8a4fa93f98094de69ea86dda5ca50055/FLAGc4acb9d34 [2020-08-21 21:33:17,017 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 21:33:17,018 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c [2020-08-21 21:33:17,040 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5d0bb12c9/8a4fa93f98094de69ea86dda5ca50055/FLAGc4acb9d34 [2020-08-21 21:33:17,228 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5d0bb12c9/8a4fa93f98094de69ea86dda5ca50055 [2020-08-21 21:33:17,240 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 21:33:17,243 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 21:33:17,247 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 21:33:17,247 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 21:33:17,251 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 21:33:17,252 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 09:33:17" (1/1) ... [2020-08-21 21:33:17,257 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6ca85c7f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:33:17, skipping insertion in model container [2020-08-21 21:33:17,257 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 09:33:17" (1/1) ... [2020-08-21 21:33:17,267 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 21:33:17,483 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 21:33:19,109 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 21:33:19,131 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 21:33:20,343 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 21:33:20,380 INFO L208 MainTranslator]: Completed translation [2020-08-21 21:33:20,381 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:33:20 WrapperNode [2020-08-21 21:33:20,381 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 21:33:20,382 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 21:33:20,382 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 21:33:20,382 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 21:33:20,398 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:33:20" (1/1) ... [2020-08-21 21:33:20,400 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:33:20" (1/1) ... [2020-08-21 21:33:20,485 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:33:20" (1/1) ... [2020-08-21 21:33:20,486 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:33:20" (1/1) ... [2020-08-21 21:33:20,586 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:33:20" (1/1) ... [2020-08-21 21:33:20,630 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:33:20" (1/1) ... [2020-08-21 21:33:20,641 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:33:20" (1/1) ... [2020-08-21 21:33:20,659 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 21:33:20,660 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 21:33:20,660 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 21:33:20,660 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 21:33:20,661 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:33:20" (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 [2020-08-21 21:33:20,738 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 21:33:20,738 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 21:33:20,738 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 21:33:20,739 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 21:33:20,739 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 21:33:20,739 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-21 21:33:20,739 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-08-21 21:33:20,740 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-21 21:33:20,740 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-08-21 21:33:20,740 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 21:33:20,740 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 21:33:20,741 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-08-21 21:33:20,741 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-08-21 21:33:20,741 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-08-21 21:33:20,741 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-08-21 21:33:20,741 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-08-21 21:33:20,742 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-08-21 21:33:20,742 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-08-21 21:33:20,742 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-21 21:33:20,742 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-21 21:33:20,743 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 21:33:20,743 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 21:33:20,743 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 21:33:25,617 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 21:33:25,617 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 21:33:25,630 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 09:33:25 BoogieIcfgContainer [2020-08-21 21:33:25,630 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 21:33:25,632 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 21:33:25,632 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 21:33:25,635 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 21:33:25,635 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 09:33:17" (1/3) ... [2020-08-21 21:33:25,636 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@59dc7bcf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 09:33:25, skipping insertion in model container [2020-08-21 21:33:25,636 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:33:20" (2/3) ... [2020-08-21 21:33:25,636 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@59dc7bcf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 09:33:25, skipping insertion in model container [2020-08-21 21:33:25,637 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 09:33:25" (3/3) ... [2020-08-21 21:33:25,638 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c [2020-08-21 21:33:25,649 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 21:33:25,658 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-08-21 21:33:25,673 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-08-21 21:33:25,705 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 21:33:25,706 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 21:33:25,706 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 21:33:25,706 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 21:33:25,706 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 21:33:25,706 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 21:33:25,707 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 21:33:25,707 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 21:33:25,749 INFO L276 IsEmpty]: Start isEmpty. Operand 1506 states. [2020-08-21 21:33:25,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 494 [2020-08-21 21:33:25,798 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:33:25,799 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:33:25,800 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:33:25,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:33:25,807 INFO L82 PathProgramCache]: Analyzing trace with hash 1738290825, now seen corresponding path program 1 times [2020-08-21 21:33:25,817 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:33:25,817 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [869628740] [2020-08-21 21:33:25,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:33:27,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:33:29,518 WARN L193 SmtUtils]: Spent 1.16 s on a formula simplification that was a NOOP. DAG size: 400 [2020-08-21 21:33:29,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:33:29,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:33:29,871 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:33:29,872 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [869628740] [2020-08-21 21:33:29,874 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:33:29,874 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 21:33:29,875 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705769434] [2020-08-21 21:33:29,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 21:33:29,894 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:33:29,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 21:33:29,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 21:33:29,912 INFO L87 Difference]: Start difference. First operand 1506 states. Second operand 5 states. [2020-08-21 21:33:47,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:33:47,756 INFO L93 Difference]: Finished difference Result 4460 states and 8053 transitions. [2020-08-21 21:33:47,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 21:33:47,759 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 493 [2020-08-21 21:33:47,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:33:47,799 INFO L225 Difference]: With dead ends: 4460 [2020-08-21 21:33:47,800 INFO L226 Difference]: Without dead ends: 2963 [2020-08-21 21:33:47,810 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 21:33:47,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2963 states. [2020-08-21 21:33:48,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2963 to 2906. [2020-08-21 21:33:48,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2906 states. [2020-08-21 21:33:48,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2906 states to 2906 states and 4772 transitions. [2020-08-21 21:33:48,021 INFO L78 Accepts]: Start accepts. Automaton has 2906 states and 4772 transitions. Word has length 493 [2020-08-21 21:33:48,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:33:48,023 INFO L479 AbstractCegarLoop]: Abstraction has 2906 states and 4772 transitions. [2020-08-21 21:33:48,023 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 21:33:48,023 INFO L276 IsEmpty]: Start isEmpty. Operand 2906 states and 4772 transitions. [2020-08-21 21:33:48,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 496 [2020-08-21 21:33:48,041 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:33:48,042 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:33:48,042 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 21:33:48,042 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:33:48,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:33:48,043 INFO L82 PathProgramCache]: Analyzing trace with hash -1236769392, now seen corresponding path program 1 times [2020-08-21 21:33:48,043 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:33:48,044 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [295616883] [2020-08-21 21:33:48,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:33:48,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:33:49,609 WARN L193 SmtUtils]: Spent 1.14 s on a formula simplification that was a NOOP. DAG size: 400 [2020-08-21 21:33:49,612 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:33:49,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:33:49,965 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:33:49,965 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [295616883] [2020-08-21 21:33:49,966 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:33:49,966 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 21:33:49,966 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448273439] [2020-08-21 21:33:49,968 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 21:33:49,968 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:33:49,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 21:33:49,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 21:33:49,969 INFO L87 Difference]: Start difference. First operand 2906 states and 4772 transitions. Second operand 4 states. [2020-08-21 21:34:10,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:34:10,365 INFO L93 Difference]: Finished difference Result 8439 states and 13819 transitions. [2020-08-21 21:34:10,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 21:34:10,366 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 495 [2020-08-21 21:34:10,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:34:10,397 INFO L225 Difference]: With dead ends: 8439 [2020-08-21 21:34:10,397 INFO L226 Difference]: Without dead ends: 5747 [2020-08-21 21:34:10,404 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 21:34:10,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5747 states. [2020-08-21 21:34:10,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5747 to 5692. [2020-08-21 21:34:10,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5692 states. [2020-08-21 21:34:10,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5692 states to 5692 states and 9324 transitions. [2020-08-21 21:34:10,619 INFO L78 Accepts]: Start accepts. Automaton has 5692 states and 9324 transitions. Word has length 495 [2020-08-21 21:34:10,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:34:10,620 INFO L479 AbstractCegarLoop]: Abstraction has 5692 states and 9324 transitions. [2020-08-21 21:34:10,620 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 21:34:10,621 INFO L276 IsEmpty]: Start isEmpty. Operand 5692 states and 9324 transitions. [2020-08-21 21:34:10,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-08-21 21:34:10,640 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:34:10,687 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:34:10,688 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 21:34:10,688 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:34:10,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:34:10,688 INFO L82 PathProgramCache]: Analyzing trace with hash -1780546784, now seen corresponding path program 1 times [2020-08-21 21:34:10,690 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:34:10,690 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [899190201] [2020-08-21 21:34:10,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:34:10,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:34:11,979 WARN L193 SmtUtils]: Spent 1.07 s on a formula simplification that was a NOOP. DAG size: 400 [2020-08-21 21:34:11,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:34:11,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:34:12,137 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:34:12,138 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [899190201] [2020-08-21 21:34:12,138 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:34:12,138 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 21:34:12,139 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2134631808] [2020-08-21 21:34:12,140 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 21:34:12,140 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:34:12,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 21:34:12,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 21:34:12,141 INFO L87 Difference]: Start difference. First operand 5692 states and 9324 transitions. Second operand 4 states.