/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=0.5 --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.3.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-c90d42b [2020-09-25 14:50:16,767 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-25 14:50:16,772 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-25 14:50:16,820 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-25 14:50:16,820 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-25 14:50:16,832 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-25 14:50:16,833 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-25 14:50:16,838 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-25 14:50:16,842 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-25 14:50:16,844 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-25 14:50:16,846 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-25 14:50:16,847 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-25 14:50:16,848 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-25 14:50:16,852 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-25 14:50:16,855 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-25 14:50:16,858 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-25 14:50:16,859 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-25 14:50:16,861 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-25 14:50:16,863 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-25 14:50:16,871 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-25 14:50:16,873 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-25 14:50:16,875 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-25 14:50:16,876 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-25 14:50:16,877 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-25 14:50:16,881 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-25 14:50:16,882 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-25 14:50:16,882 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-25 14:50:16,886 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-25 14:50:16,886 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-25 14:50:16,888 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-25 14:50:16,888 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-25 14:50:16,889 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-25 14:50:16,890 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-25 14:50:16,891 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-25 14:50:16,893 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-25 14:50:16,893 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-25 14:50:16,894 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-25 14:50:16,894 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-25 14:50:16,894 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-25 14:50:16,896 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-25 14:50:16,897 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-25 14:50:16,899 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 14:50:16,944 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-25 14:50:16,944 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-25 14:50:16,947 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-25 14:50:16,947 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-25 14:50:16,947 INFO L138 SettingsManager]: * Use SBE=true [2020-09-25 14:50:16,947 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-25 14:50:16,948 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-25 14:50:16,948 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-25 14:50:16,949 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-25 14:50:16,949 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-25 14:50:16,950 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-25 14:50:16,950 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-25 14:50:16,950 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-25 14:50:16,951 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-25 14:50:16,951 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-25 14:50:16,951 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-25 14:50:16,952 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-25 14:50:16,952 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-25 14:50:16,952 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-25 14:50:16,952 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-25 14:50:16,952 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-25 14:50:16,953 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-25 14:50:16,953 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-25 14:50:16,953 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-25 14:50:16,953 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-25 14:50:16,954 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-25 14:50:16,954 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-25 14:50:16,954 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-25 14:50:16,954 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-25 14:50:16,954 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=0.5;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=0.5;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=0.5;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=0.5;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=0.5;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=0.5;log-additional-information=true; [2020-09-25 14:50:17,502 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-25 14:50:17,530 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-25 14:50:17,538 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-25 14:50:17,540 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-25 14:50:17,540 INFO L275 PluginConnector]: CDTParser initialized [2020-09-25 14:50:17,542 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.3.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-09-25 14:50:17,625 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2c3ea260e/f9219eebfb1e4f5a94ff9567e4864947/FLAG634c7a829 [2020-09-25 14:50:18,260 INFO L306 CDTParser]: Found 1 translation units. [2020-09-25 14:50:18,261 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.3.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-09-25 14:50:18,276 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2c3ea260e/f9219eebfb1e4f5a94ff9567e4864947/FLAG634c7a829 [2020-09-25 14:50:18,487 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2c3ea260e/f9219eebfb1e4f5a94ff9567e4864947 [2020-09-25 14:50:18,500 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-25 14:50:18,505 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-25 14:50:18,506 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-25 14:50:18,506 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-25 14:50:18,511 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-25 14:50:18,512 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 02:50:18" (1/1) ... [2020-09-25 14:50:18,517 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@425c36b8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:50:18, skipping insertion in model container [2020-09-25 14:50:18,517 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 02:50:18" (1/1) ... [2020-09-25 14:50:18,527 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-25 14:50:18,617 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-25 14:50:19,286 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-25 14:50:19,300 INFO L203 MainTranslator]: Completed pre-run [2020-09-25 14:50:19,512 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-25 14:50:19,536 INFO L208 MainTranslator]: Completed translation [2020-09-25 14:50:19,537 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:50:19 WrapperNode [2020-09-25 14:50:19,537 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-25 14:50:19,538 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-25 14:50:19,538 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-25 14:50:19,539 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-25 14:50:19,555 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:50:19" (1/1) ... [2020-09-25 14:50:19,555 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:50:19" (1/1) ... [2020-09-25 14:50:19,576 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:50:19" (1/1) ... [2020-09-25 14:50:19,576 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:50:19" (1/1) ... [2020-09-25 14:50:19,606 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:50:19" (1/1) ... [2020-09-25 14:50:19,628 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:50:19" (1/1) ... [2020-09-25 14:50:19,633 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:50:19" (1/1) ... [2020-09-25 14:50:19,641 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-25 14:50:19,642 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-25 14:50:19,642 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-25 14:50:19,643 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-25 14:50:19,644 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:50:19" (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 14:50:19,756 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-25 14:50:19,756 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-25 14:50:19,757 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-09-25 14:50:19,757 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-25 14:50:19,757 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-25 14:50:19,758 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-09-25 14:50:19,758 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-09-25 14:50:19,759 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-09-25 14:50:19,759 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-09-25 14:50:19,759 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-09-25 14:50:19,759 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-09-25 14:50:19,760 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-09-25 14:50:19,760 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-09-25 14:50:19,760 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-09-25 14:50:19,760 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-09-25 14:50:19,761 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-09-25 14:50:19,761 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-09-25 14:50:19,762 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-09-25 14:50:19,762 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-25 14:50:19,762 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-25 14:50:19,762 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-25 14:50:21,535 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-25 14:50:21,535 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-09-25 14:50:21,546 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.09 02:50:21 BoogieIcfgContainer [2020-09-25 14:50:21,547 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-25 14:50:21,548 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-25 14:50:21,548 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-25 14:50:21,553 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-25 14:50:21,553 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.09 02:50:18" (1/3) ... [2020-09-25 14:50:21,554 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ebf4bf0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.09 02:50:21, skipping insertion in model container [2020-09-25 14:50:21,554 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:50:19" (2/3) ... [2020-09-25 14:50:21,555 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ebf4bf0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.09 02:50:21, skipping insertion in model container [2020-09-25 14:50:21,555 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.09 02:50:21" (3/3) ... [2020-09-25 14:50:21,557 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.3.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-09-25 14:50:21,567 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-25 14:50:21,578 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-25 14:50:21,604 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-25 14:50:21,638 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-25 14:50:21,638 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-25 14:50:21,638 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-25 14:50:21,638 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-25 14:50:21,639 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-25 14:50:21,639 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-25 14:50:21,639 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-25 14:50:21,639 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-25 14:50:21,679 INFO L276 IsEmpty]: Start isEmpty. Operand 903 states. [2020-09-25 14:50:21,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 450 [2020-09-25 14:50:21,716 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 14:50:21,718 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] [2020-09-25 14:50:21,719 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 14:50:21,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 14:50:21,728 INFO L82 PathProgramCache]: Analyzing trace with hash 1632941541, now seen corresponding path program 1 times [2020-09-25 14:50:21,740 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 14:50:21,741 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2068541055] [2020-09-25 14:50:21,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 14:50:22,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:50:22,595 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:22,942 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:23,221 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:23,443 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:23,639 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:23,837 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:24,269 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:26,802 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:27,176 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:27,301 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:50:27,301 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 456 [2020-09-25 14:50:27,302 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 9 [2020-09-25 14:50:27,302 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5032 [2020-09-25 14:50:27,307 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:50:27,308 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:50:27,309 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-09-25 14:50:27,310 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 200 [2020-09-25 14:50:27,310 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 207 [2020-09-25 14:50:27,311 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 7 [2020-09-25 14:50:28,204 WARN L193 SmtUtils]: Spent 363.00 ms on a formula simplification that was a NOOP. DAG size: 175 [2020-09-25 14:50:28,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 14:50:28,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:50:28,226 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:28,273 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:50:28,273 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 67 [2020-09-25 14:50:28,274 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 14:50:28,274 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 56 [2020-09-25 14:50:28,275 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:50:28,275 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:50:28,276 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 14:50:28,276 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 14:50:28,276 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 14:50:28,277 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-09-25 14:50:28,813 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 14:50:28,815 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2068541055] [2020-09-25 14:50:28,818 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-25 14:50:28,818 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-25 14:50:28,820 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124921758] [2020-09-25 14:50:28,835 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-25 14:50:28,835 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 14:50:28,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-25 14:50:28,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-25 14:50:28,868 INFO L87 Difference]: Start difference. First operand 903 states. Second operand 4 states. [2020-09-25 14:50:32,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 14:50:32,877 INFO L93 Difference]: Finished difference Result 1657 states and 2169 transitions. [2020-09-25 14:50:32,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-25 14:50:32,881 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 449 [2020-09-25 14:50:32,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 14:50:32,915 INFO L225 Difference]: With dead ends: 1657 [2020-09-25 14:50:32,916 INFO L226 Difference]: Without dead ends: 1241 [2020-09-25 14:50:32,924 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-25 14:50:32,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1241 states. [2020-09-25 14:50:33,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1241 to 1234. [2020-09-25 14:50:33,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1234 states. [2020-09-25 14:50:33,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1234 states to 1234 states and 1513 transitions. [2020-09-25 14:50:33,086 INFO L78 Accepts]: Start accepts. Automaton has 1234 states and 1513 transitions. Word has length 449 [2020-09-25 14:50:33,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 14:50:33,089 INFO L479 AbstractCegarLoop]: Abstraction has 1234 states and 1513 transitions. [2020-09-25 14:50:33,090 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-25 14:50:33,090 INFO L276 IsEmpty]: Start isEmpty. Operand 1234 states and 1513 transitions. [2020-09-25 14:50:33,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 450 [2020-09-25 14:50:33,104 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 14:50:33,105 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] [2020-09-25 14:50:33,106 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-25 14:50:33,106 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 14:50:33,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 14:50:33,106 INFO L82 PathProgramCache]: Analyzing trace with hash -1248222459, now seen corresponding path program 1 times [2020-09-25 14:50:33,107 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 14:50:33,107 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [979010308] [2020-09-25 14:50:33,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 14:50:33,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:50:33,328 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:33,502 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:33,688 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:33,825 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:33,953 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:34,069 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:34,413 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:36,719 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:37,061 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:38,241 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:50:38,242 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 456 [2020-09-25 14:50:38,242 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 9 [2020-09-25 14:50:38,242 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5028 [2020-09-25 14:50:38,244 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:50:38,244 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:50:38,245 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-09-25 14:50:38,253 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 201 [2020-09-25 14:50:38,253 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 218 [2020-09-25 14:50:38,254 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 10 [2020-09-25 14:50:38,653 WARN L193 SmtUtils]: Spent 195.00 ms on a formula simplification that was a NOOP. DAG size: 175 [2020-09-25 14:50:38,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 14:50:38,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:50:38,681 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:38,731 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:50:38,732 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 67 [2020-09-25 14:50:38,732 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 14:50:38,733 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 60 [2020-09-25 14:50:38,733 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:50:38,733 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:50:38,734 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 14:50:38,734 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 14:50:38,735 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 14:50:38,735 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-09-25 14:50:39,155 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 14:50:39,157 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [979010308] [2020-09-25 14:50:39,158 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-25 14:50:39,158 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-25 14:50:39,158 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424494104] [2020-09-25 14:50:39,165 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-25 14:50:39,165 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 14:50:39,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-25 14:50:39,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-25 14:50:39,166 INFO L87 Difference]: Start difference. First operand 1234 states and 1513 transitions. Second operand 4 states. [2020-09-25 14:50:42,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 14:50:42,109 INFO L93 Difference]: Finished difference Result 2498 states and 3152 transitions. [2020-09-25 14:50:42,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-25 14:50:42,110 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 449 [2020-09-25 14:50:42,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 14:50:42,122 INFO L225 Difference]: With dead ends: 2498 [2020-09-25 14:50:42,123 INFO L226 Difference]: Without dead ends: 2052 [2020-09-25 14:50:42,128 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 14:50:42,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2052 states. [2020-09-25 14:50:42,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2052 to 2040. [2020-09-25 14:50:42,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2040 states. [2020-09-25 14:50:42,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2040 states to 2040 states and 2543 transitions. [2020-09-25 14:50:42,188 INFO L78 Accepts]: Start accepts. Automaton has 2040 states and 2543 transitions. Word has length 449 [2020-09-25 14:50:42,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 14:50:42,189 INFO L479 AbstractCegarLoop]: Abstraction has 2040 states and 2543 transitions. [2020-09-25 14:50:42,189 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-25 14:50:42,190 INFO L276 IsEmpty]: Start isEmpty. Operand 2040 states and 2543 transitions. [2020-09-25 14:50:42,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 450 [2020-09-25 14:50:42,195 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 14:50:42,195 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] [2020-09-25 14:50:42,196 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-25 14:50:42,196 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 14:50:42,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 14:50:42,197 INFO L82 PathProgramCache]: Analyzing trace with hash 1103013733, now seen corresponding path program 1 times [2020-09-25 14:50:42,197 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 14:50:42,197 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [424589357] [2020-09-25 14:50:42,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 14:50:42,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:50:42,408 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:42,584 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:42,738 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:42,883 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:43,011 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:43,128 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:44,164 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:44,411 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:47,069 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:47,325 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:50:47,325 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 456 [2020-09-25 14:50:47,325 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 9 [2020-09-25 14:50:47,326 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5025 [2020-09-25 14:50:47,326 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:50:47,326 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:50:47,326 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-09-25 14:50:47,327 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 171 [2020-09-25 14:50:47,327 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 120 [2020-09-25 14:50:47,327 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 14:50:47,750 WARN L193 SmtUtils]: Spent 205.00 ms on a formula simplification that was a NOOP. DAG size: 175 [2020-09-25 14:50:47,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 14:50:47,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:50:47,775 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:47,815 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:50:47,816 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 67 [2020-09-25 14:50:47,816 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 14:50:47,817 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 56 [2020-09-25 14:50:47,818 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:50:47,818 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:50:47,819 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 14:50:47,819 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 14:50:47,820 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 14:50:47,820 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-09-25 14:50:48,230 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 14:50:48,231 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [424589357] [2020-09-25 14:50:48,232 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-25 14:50:48,232 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-25 14:50:48,232 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801486539] [2020-09-25 14:50:48,233 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-25 14:50:48,234 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 14:50:48,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-25 14:50:48,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-25 14:50:48,235 INFO L87 Difference]: Start difference. First operand 2040 states and 2543 transitions. Second operand 5 states. [2020-09-25 14:50:52,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 14:50:52,697 INFO L93 Difference]: Finished difference Result 5618 states and 7065 transitions. [2020-09-25 14:50:52,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-25 14:50:52,698 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 449 [2020-09-25 14:50:52,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 14:50:52,715 INFO L225 Difference]: With dead ends: 5618 [2020-09-25 14:50:52,715 INFO L226 Difference]: Without dead ends: 3778 [2020-09-25 14:50:52,720 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-25 14:50:52,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3778 states. [2020-09-25 14:50:52,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3778 to 3776. [2020-09-25 14:50:52,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3776 states. [2020-09-25 14:50:52,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3776 states to 3776 states and 4713 transitions. [2020-09-25 14:50:52,840 INFO L78 Accepts]: Start accepts. Automaton has 3776 states and 4713 transitions. Word has length 449 [2020-09-25 14:50:52,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 14:50:52,841 INFO L479 AbstractCegarLoop]: Abstraction has 3776 states and 4713 transitions. [2020-09-25 14:50:52,841 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-25 14:50:52,841 INFO L276 IsEmpty]: Start isEmpty. Operand 3776 states and 4713 transitions. [2020-09-25 14:50:52,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-09-25 14:50:52,849 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 14:50:52,850 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] [2020-09-25 14:50:52,850 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-25 14:50:52,850 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 14:50:52,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 14:50:52,851 INFO L82 PathProgramCache]: Analyzing trace with hash 1493609028, now seen corresponding path program 1 times [2020-09-25 14:50:52,851 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 14:50:52,852 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2013158523] [2020-09-25 14:50:52,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 14:50:52,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:50:52,983 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:53,155 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:53,298 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:53,424 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:53,536 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:54,042 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:54,812 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:55,136 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:57,919 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:50:57,920 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 457 [2020-09-25 14:50:57,920 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 8 [2020-09-25 14:50:57,920 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5006 [2020-09-25 14:50:57,920 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:50:57,921 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:50:57,921 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-09-25 14:50:57,921 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 170 [2020-09-25 14:50:57,921 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 76 [2020-09-25 14:50:57,921 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-25 14:50:58,333 WARN L193 SmtUtils]: Spent 194.00 ms on a formula simplification that was a NOOP. DAG size: 175 [2020-09-25 14:50:58,335 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 14:50:58,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:50:58,351 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:50:58,386 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:50:58,386 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 67 [2020-09-25 14:50:58,387 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 14:50:58,387 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 43 [2020-09-25 14:50:58,387 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:50:58,387 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:50:58,387 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 14:50:58,388 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 14:50:58,388 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 14:50:58,388 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 14:50:58,692 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 14:50:58,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2013158523] [2020-09-25 14:50:58,693 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-25 14:50:58,693 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-25 14:50:58,698 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311148500] [2020-09-25 14:50:58,699 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-25 14:50:58,700 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 14:50:58,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-25 14:50:58,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-25 14:50:58,701 INFO L87 Difference]: Start difference. First operand 3776 states and 4713 transitions. Second operand 5 states.