/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=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.2 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 23:10:01,635 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 23:10:01,638 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 23:10:01,663 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 23:10:01,664 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 23:10:01,665 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 23:10:01,666 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 23:10:01,669 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 23:10:01,674 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 23:10:01,675 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 23:10:01,676 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 23:10:01,680 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 23:10:01,680 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 23:10:01,681 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 23:10:01,684 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 23:10:01,686 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 23:10:01,687 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 23:10:01,688 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 23:10:01,691 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 23:10:01,693 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 23:10:01,695 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 23:10:01,696 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 23:10:01,698 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 23:10:01,698 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 23:10:01,705 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 23:10:01,706 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 23:10:01,706 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 23:10:01,710 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 23:10:01,711 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 23:10:01,713 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 23:10:01,713 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 23:10:01,714 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 23:10:01,715 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 23:10:01,715 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 23:10:01,725 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 23:10:01,726 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 23:10:01,729 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 23:10:01,729 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 23:10:01,729 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 23:10:01,730 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 23:10:01,733 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 23:10:01,734 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 23:10:01,779 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 23:10:01,780 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 23:10:01,782 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 23:10:01,782 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 23:10:01,782 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 23:10:01,782 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 23:10:01,783 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 23:10:01,783 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 23:10:01,783 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 23:10:01,783 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 23:10:01,783 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 23:10:01,784 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 23:10:01,785 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 23:10:01,785 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 23:10:01,785 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 23:10:01,785 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 23:10:01,786 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 23:10:01,786 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 23:10:01,786 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 23:10:01,786 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 23:10:01,787 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 23:10:01,787 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 23:10:01,787 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 23:10:01,787 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 23:10:01,787 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 23:10:01,788 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 23:10:01,788 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 23:10:01,788 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 23:10:01,788 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 23:10:01,788 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=WIDESTAMONGSMALL;tolerance=0.2;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2;log-additional-information=true; [2020-08-21 23:10:02,142 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 23:10:02,159 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 23:10:02,163 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 23:10:02,165 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 23:10:02,165 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 23:10:02,166 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-08-21 23:10:02,225 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2204e43f4/509522787d7041e6b393dfff9a316169/FLAGd103e6d82 [2020-08-21 23:10:02,940 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 23:10:02,941 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-08-21 23:10:02,963 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2204e43f4/509522787d7041e6b393dfff9a316169/FLAGd103e6d82 [2020-08-21 23:10:03,029 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2204e43f4/509522787d7041e6b393dfff9a316169 [2020-08-21 23:10:03,037 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 23:10:03,039 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 23:10:03,040 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 23:10:03,041 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 23:10:03,044 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 23:10:03,045 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 11:10:03" (1/1) ... [2020-08-21 23:10:03,049 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@701ef800 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:10:03, skipping insertion in model container [2020-08-21 23:10:03,049 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 11:10:03" (1/1) ... [2020-08-21 23:10:03,058 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 23:10:03,267 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 23:10:05,121 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 23:10:05,137 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 23:10:06,581 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 23:10:06,618 INFO L208 MainTranslator]: Completed translation [2020-08-21 23:10:06,619 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:10:06 WrapperNode [2020-08-21 23:10:06,620 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 23:10:06,621 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 23:10:06,621 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 23:10:06,621 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 23:10:06,637 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:10:06" (1/1) ... [2020-08-21 23:10:06,638 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:10:06" (1/1) ... [2020-08-21 23:10:06,681 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:10:06" (1/1) ... [2020-08-21 23:10:06,682 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:10:06" (1/1) ... [2020-08-21 23:10:06,750 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:10:06" (1/1) ... [2020-08-21 23:10:06,794 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:10:06" (1/1) ... [2020-08-21 23:10:06,805 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:10:06" (1/1) ... [2020-08-21 23:10:06,823 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 23:10:06,823 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 23:10:06,823 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 23:10:06,824 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 23:10:06,825 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:10:06" (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 23:10:06,893 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 23:10:06,893 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 23:10:06,894 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 23:10:06,894 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 23:10:06,894 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 23:10:06,894 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-21 23:10:06,895 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-21 23:10:06,895 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-08-21 23:10:06,895 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 23:10:06,895 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 23:10:06,896 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-08-21 23:10:06,896 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-08-21 23:10:06,896 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-08-21 23:10:06,896 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-08-21 23:10:06,896 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-08-21 23:10:06,897 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-08-21 23:10:06,897 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-08-21 23:10:06,897 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-21 23:10:06,897 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-21 23:10:06,898 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 23:10:06,898 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 23:10:06,898 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 23:10:11,443 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 23:10:11,443 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 23:10:11,462 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 11:10:11 BoogieIcfgContainer [2020-08-21 23:10:11,463 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 23:10:11,465 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 23:10:11,466 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 23:10:11,469 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 23:10:11,469 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 11:10:03" (1/3) ... [2020-08-21 23:10:11,471 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79b4ae94 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 11:10:11, skipping insertion in model container [2020-08-21 23:10:11,471 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:10:06" (2/3) ... [2020-08-21 23:10:11,471 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79b4ae94 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 11:10:11, skipping insertion in model container [2020-08-21 23:10:11,472 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 11:10:11" (3/3) ... [2020-08-21 23:10:11,476 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-08-21 23:10:11,488 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 23:10:11,505 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-08-21 23:10:11,519 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-08-21 23:10:11,546 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 23:10:11,546 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 23:10:11,546 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 23:10:11,546 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 23:10:11,546 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 23:10:11,546 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 23:10:11,546 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 23:10:11,546 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 23:10:11,589 INFO L276 IsEmpty]: Start isEmpty. Operand 1484 states. [2020-08-21 23:10:11,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 485 [2020-08-21 23:10:11,632 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:10:11,633 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] [2020-08-21 23:10:11,634 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:10:11,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:10:11,641 INFO L82 PathProgramCache]: Analyzing trace with hash -1064488228, now seen corresponding path program 1 times [2020-08-21 23:10:11,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:10:11,650 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1820200594] [2020-08-21 23:10:11,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:10:13,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:10:15,307 WARN L193 SmtUtils]: Spent 1.04 s on a formula simplification that was a NOOP. DAG size: 406 [2020-08-21 23:10:15,310 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:10:15,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:10:16,179 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 23:10:16,180 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1820200594] [2020-08-21 23:10:16,182 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 23:10:16,183 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 23:10:16,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164193531] [2020-08-21 23:10:16,190 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 23:10:16,191 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:10:16,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 23:10:16,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 23:10:16,208 INFO L87 Difference]: Start difference. First operand 1484 states. Second operand 5 states. [2020-08-21 23:10:33,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:10:33,648 INFO L93 Difference]: Finished difference Result 4394 states and 7936 transitions. [2020-08-21 23:10:33,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 23:10:33,651 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 484 [2020-08-21 23:10:33,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:10:33,697 INFO L225 Difference]: With dead ends: 4394 [2020-08-21 23:10:33,697 INFO L226 Difference]: Without dead ends: 2919 [2020-08-21 23:10:33,707 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 23:10:33,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2919 states. [2020-08-21 23:10:33,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2919 to 2865. [2020-08-21 23:10:33,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2865 states. [2020-08-21 23:10:33,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2865 states to 2865 states and 4721 transitions. [2020-08-21 23:10:33,982 INFO L78 Accepts]: Start accepts. Automaton has 2865 states and 4721 transitions. Word has length 484 [2020-08-21 23:10:33,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:10:33,984 INFO L479 AbstractCegarLoop]: Abstraction has 2865 states and 4721 transitions. [2020-08-21 23:10:33,984 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 23:10:33,985 INFO L276 IsEmpty]: Start isEmpty. Operand 2865 states and 4721 transitions. [2020-08-21 23:10:34,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 487 [2020-08-21 23:10:34,001 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:10:34,002 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] [2020-08-21 23:10:34,003 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 23:10:34,003 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:10:34,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:10:34,004 INFO L82 PathProgramCache]: Analyzing trace with hash 1721765960, now seen corresponding path program 1 times [2020-08-21 23:10:34,004 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:10:34,004 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [819818706] [2020-08-21 23:10:34,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:10:34,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:10:35,581 WARN L193 SmtUtils]: Spent 1.03 s on a formula simplification that was a NOOP. DAG size: 406 [2020-08-21 23:10:35,584 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:10:35,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:10:36,486 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 23:10:36,487 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [819818706] [2020-08-21 23:10:36,487 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 23:10:36,488 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 23:10:36,488 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546367275] [2020-08-21 23:10:36,491 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 23:10:36,492 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:10:36,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 23:10:36,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 23:10:36,492 INFO L87 Difference]: Start difference. First operand 2865 states and 4721 transitions. Second operand 4 states. [2020-08-21 23:10:57,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:10:57,550 INFO L93 Difference]: Finished difference Result 8316 states and 13666 transitions. [2020-08-21 23:10:57,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 23:10:57,556 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 486 [2020-08-21 23:10:57,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:10:57,590 INFO L225 Difference]: With dead ends: 8316 [2020-08-21 23:10:57,591 INFO L226 Difference]: Without dead ends: 5665 [2020-08-21 23:10:57,598 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 23:10:57,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5665 states. [2020-08-21 23:10:57,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5665 to 5613. [2020-08-21 23:10:57,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5613 states. [2020-08-21 23:10:57,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5613 states to 5613 states and 9225 transitions. [2020-08-21 23:10:57,802 INFO L78 Accepts]: Start accepts. Automaton has 5613 states and 9225 transitions. Word has length 486 [2020-08-21 23:10:57,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:10:57,804 INFO L479 AbstractCegarLoop]: Abstraction has 5613 states and 9225 transitions. [2020-08-21 23:10:57,804 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 23:10:57,805 INFO L276 IsEmpty]: Start isEmpty. Operand 5613 states and 9225 transitions. [2020-08-21 23:10:57,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-08-21 23:10:57,819 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:10:57,823 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] [2020-08-21 23:10:57,823 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 23:10:57,824 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:10:57,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:10:57,824 INFO L82 PathProgramCache]: Analyzing trace with hash 326918239, now seen corresponding path program 1 times [2020-08-21 23:10:57,833 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:10:57,833 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1506553907] [2020-08-21 23:10:57,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:10:57,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:10:58,961 WARN L193 SmtUtils]: Spent 906.00 ms on a formula simplification that was a NOOP. DAG size: 406 [2020-08-21 23:10:58,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:10:58,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:10:59,166 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 23:10:59,167 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1506553907] [2020-08-21 23:10:59,167 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 23:10:59,167 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 23:10:59,168 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1288380818] [2020-08-21 23:10:59,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 23:10:59,169 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:10:59,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 23:10:59,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 23:10:59,170 INFO L87 Difference]: Start difference. First operand 5613 states and 9225 transitions. Second operand 4 states.