/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=0.6 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-22 00:45:52,805 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 00:45:52,808 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 00:45:52,846 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 00:45:52,846 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 00:45:52,847 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 00:45:52,848 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 00:45:52,850 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 00:45:52,852 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 00:45:52,853 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 00:45:52,854 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 00:45:52,855 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 00:45:52,855 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 00:45:52,856 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 00:45:52,857 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 00:45:52,858 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 00:45:52,859 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 00:45:52,860 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 00:45:52,862 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 00:45:52,864 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 00:45:52,865 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 00:45:52,866 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 00:45:52,868 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 00:45:52,869 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 00:45:52,872 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-22 00:45:52,872 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-22 00:45:52,872 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-22 00:45:52,873 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-22 00:45:52,874 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-22 00:45:52,875 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-22 00:45:52,875 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-22 00:45:52,876 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-22 00:45:52,876 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-22 00:45:52,877 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-22 00:45:52,878 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-22 00:45:52,878 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-22 00:45:52,879 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-22 00:45:52,879 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-22 00:45:52,879 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 00:45:52,880 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 00:45:52,881 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 00:45:52,882 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 [2020-08-22 00:45:52,904 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 00:45:52,904 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 00:45:52,906 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 00:45:52,906 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 00:45:52,906 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 00:45:52,906 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 00:45:52,907 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 00:45:52,907 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 00:45:52,907 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 00:45:52,907 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 00:45:52,907 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 00:45:52,907 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 00:45:52,908 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 00:45:52,908 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 00:45:52,908 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 00:45:52,908 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 00:45:52,908 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 00:45:52,909 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 00:45:52,909 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 00:45:52,909 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 00:45:52,909 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 00:45:52,909 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 00:45:52,910 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 00:45:52,910 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 00:45:52,910 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 00:45:52,910 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 00:45:52,910 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 00:45:52,911 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 00:45:52,911 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 00:45:52,911 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=0.6;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=0.6;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=0.6;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=0.6;log-additional-information=true; [2020-08-22 00:45:53,192 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 00:45:53,205 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 00:45:53,208 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 00:45:53,210 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 00:45:53,210 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 00:45:53,211 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-08-22 00:45:53,275 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6e06382fc/8eabc7fe399b4b1b90a076e792887c8f/FLAG85255c130 [2020-08-22 00:45:53,968 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 00:45:53,969 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-08-22 00:45:53,991 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6e06382fc/8eabc7fe399b4b1b90a076e792887c8f/FLAG85255c130 [2020-08-22 00:45:54,113 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6e06382fc/8eabc7fe399b4b1b90a076e792887c8f [2020-08-22 00:45:54,125 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 00:45:54,127 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 00:45:54,128 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 00:45:54,128 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 00:45:54,132 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 00:45:54,133 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 12:45:54" (1/1) ... [2020-08-22 00:45:54,136 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@238ffb9c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:45:54, skipping insertion in model container [2020-08-22 00:45:54,136 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 12:45:54" (1/1) ... [2020-08-22 00:45:54,145 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 00:45:54,323 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 00:45:55,838 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 00:45:55,852 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 00:45:57,382 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 00:45:57,430 INFO L208 MainTranslator]: Completed translation [2020-08-22 00:45:57,431 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:45:57 WrapperNode [2020-08-22 00:45:57,431 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 00:45:57,432 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 00:45:57,432 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 00:45:57,432 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 00:45:57,454 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:45:57" (1/1) ... [2020-08-22 00:45:57,457 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:45:57" (1/1) ... [2020-08-22 00:45:57,526 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:45:57" (1/1) ... [2020-08-22 00:45:57,526 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:45:57" (1/1) ... [2020-08-22 00:45:57,611 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:45:57" (1/1) ... [2020-08-22 00:45:57,649 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:45:57" (1/1) ... [2020-08-22 00:45:57,664 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:45:57" (1/1) ... [2020-08-22 00:45:57,685 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 00:45:57,686 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 00:45:57,686 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 00:45:57,686 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 00:45:57,687 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:45:57" (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 [2020-08-22 00:45:57,770 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 00:45:57,771 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 00:45:57,771 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-22 00:45:57,772 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 00:45:57,772 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 00:45:57,772 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-22 00:45:57,772 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-22 00:45:57,773 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-08-22 00:45:57,773 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-22 00:45:57,774 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-22 00:45:57,774 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-08-22 00:45:57,774 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-08-22 00:45:57,774 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-08-22 00:45:57,774 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-08-22 00:45:57,775 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-08-22 00:45:57,776 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-08-22 00:45:57,776 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-08-22 00:45:57,776 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-22 00:45:57,776 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-22 00:45:57,777 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 00:45:57,777 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 00:45:57,777 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 00:46:02,068 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 00:46:02,068 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-22 00:46:02,081 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 12:46:02 BoogieIcfgContainer [2020-08-22 00:46:02,081 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 00:46:02,083 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 00:46:02,083 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 00:46:02,087 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 00:46:02,087 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 12:45:54" (1/3) ... [2020-08-22 00:46:02,088 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@230ca98e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 12:46:02, skipping insertion in model container [2020-08-22 00:46:02,089 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:45:57" (2/3) ... [2020-08-22 00:46:02,089 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@230ca98e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 12:46:02, skipping insertion in model container [2020-08-22 00:46:02,089 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 12:46:02" (3/3) ... [2020-08-22 00:46:02,092 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-08-22 00:46:02,105 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 00:46:02,114 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-08-22 00:46:02,129 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-08-22 00:46:02,161 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 00:46:02,161 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 00:46:02,161 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 00:46:02,161 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 00:46:02,161 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 00:46:02,162 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 00:46:02,162 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 00:46:02,162 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 00:46:02,202 INFO L276 IsEmpty]: Start isEmpty. Operand 1371 states. [2020-08-22 00:46:02,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 465 [2020-08-22 00:46:02,239 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:46:02,240 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] [2020-08-22 00:46:02,241 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:46:02,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:46:02,248 INFO L82 PathProgramCache]: Analyzing trace with hash -856462850, now seen corresponding path program 1 times [2020-08-22 00:46:02,258 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:46:02,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1904109766] [2020-08-22 00:46:02,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:46:04,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:46:05,839 WARN L193 SmtUtils]: Spent 1.22 s on a formula simplification that was a NOOP. DAG size: 391 [2020-08-22 00:46:05,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:46:05,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:46:06,574 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:46:06,575 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1904109766] [2020-08-22 00:46:06,577 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 00:46:06,577 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 00:46:06,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613207757] [2020-08-22 00:46:06,585 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 00:46:06,585 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:46:06,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 00:46:06,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 00:46:06,602 INFO L87 Difference]: Start difference. First operand 1371 states. Second operand 5 states. [2020-08-22 00:46:23,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:46:23,583 INFO L93 Difference]: Finished difference Result 4059 states and 7350 transitions. [2020-08-22 00:46:23,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 00:46:23,586 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 464 [2020-08-22 00:46:23,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:46:23,637 INFO L225 Difference]: With dead ends: 4059 [2020-08-22 00:46:23,637 INFO L226 Difference]: Without dead ends: 2697 [2020-08-22 00:46:23,647 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-22 00:46:23,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2697 states. [2020-08-22 00:46:23,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2697 to 2647. [2020-08-22 00:46:23,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2647 states. [2020-08-22 00:46:23,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2647 states to 2647 states and 4347 transitions. [2020-08-22 00:46:23,875 INFO L78 Accepts]: Start accepts. Automaton has 2647 states and 4347 transitions. Word has length 464 [2020-08-22 00:46:23,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:46:23,876 INFO L479 AbstractCegarLoop]: Abstraction has 2647 states and 4347 transitions. [2020-08-22 00:46:23,876 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 00:46:23,877 INFO L276 IsEmpty]: Start isEmpty. Operand 2647 states and 4347 transitions. [2020-08-22 00:46:23,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 467 [2020-08-22 00:46:23,889 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:46:23,889 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:46:23,890 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 00:46:23,890 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:46:23,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:46:23,891 INFO L82 PathProgramCache]: Analyzing trace with hash -1286826198, now seen corresponding path program 1 times [2020-08-22 00:46:23,891 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:46:23,891 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [471335000] [2020-08-22 00:46:23,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:46:24,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:46:25,861 WARN L193 SmtUtils]: Spent 1.48 s on a formula simplification that was a NOOP. DAG size: 391 [2020-08-22 00:46:25,863 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:46:25,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:46:26,287 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:46:26,288 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [471335000] [2020-08-22 00:46:26,288 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 00:46:26,288 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 00:46:26,289 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1027025672] [2020-08-22 00:46:26,292 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 00:46:26,292 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:46:26,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 00:46:26,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 00:46:26,293 INFO L87 Difference]: Start difference. First operand 2647 states and 4347 transitions. Second operand 4 states. [2020-08-22 00:46:44,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:46:44,915 INFO L93 Difference]: Finished difference Result 7670 states and 12560 transitions. [2020-08-22 00:46:44,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 00:46:44,921 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 466 [2020-08-22 00:46:44,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:46:44,954 INFO L225 Difference]: With dead ends: 7670 [2020-08-22 00:46:44,955 INFO L226 Difference]: Without dead ends: 5237 [2020-08-22 00:46:44,962 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 00:46:44,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5237 states. [2020-08-22 00:46:45,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5237 to 5189. [2020-08-22 00:46:45,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5189 states. [2020-08-22 00:46:45,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5189 states to 5189 states and 8497 transitions. [2020-08-22 00:46:45,208 INFO L78 Accepts]: Start accepts. Automaton has 5189 states and 8497 transitions. Word has length 466 [2020-08-22 00:46:45,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:46:45,209 INFO L479 AbstractCegarLoop]: Abstraction has 5189 states and 8497 transitions. [2020-08-22 00:46:45,210 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 00:46:45,210 INFO L276 IsEmpty]: Start isEmpty. Operand 5189 states and 8497 transitions. [2020-08-22 00:46:45,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-08-22 00:46:45,233 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:46:45,236 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] [2020-08-22 00:46:45,237 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 00:46:45,237 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:46:45,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:46:45,238 INFO L82 PathProgramCache]: Analyzing trace with hash -244647039, now seen corresponding path program 1 times [2020-08-22 00:46:45,239 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:46:45,240 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1018787587] [2020-08-22 00:46:45,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:46:45,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:46:46,477 WARN L193 SmtUtils]: Spent 1.02 s on a formula simplification that was a NOOP. DAG size: 391 [2020-08-22 00:46:46,479 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:46:46,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:46:46,662 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:46:46,663 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1018787587] [2020-08-22 00:46:46,663 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 00:46:46,663 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 00:46:46,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044886445] [2020-08-22 00:46:46,664 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 00:46:46,665 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:46:46,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 00:46:46,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 00:46:46,665 INFO L87 Difference]: Start difference. First operand 5189 states and 8497 transitions. Second operand 4 states.