/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=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.3 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/ddlm2013.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-22 04:47:39,928 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 04:47:39,931 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 04:47:39,974 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 04:47:39,975 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 04:47:39,986 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 04:47:39,989 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 04:47:39,990 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 04:47:39,992 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 04:47:39,993 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 04:47:39,995 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 04:47:39,996 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 04:47:39,996 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 04:47:39,998 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 04:47:39,999 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 04:47:40,001 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 04:47:40,002 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 04:47:40,006 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 04:47:40,007 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 04:47:40,012 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 04:47:40,015 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 04:47:40,016 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 04:47:40,018 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 04:47:40,019 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 04:47:40,024 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-22 04:47:40,024 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-22 04:47:40,025 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-22 04:47:40,027 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-22 04:47:40,027 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-22 04:47:40,029 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-22 04:47:40,029 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-22 04:47:40,030 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-22 04:47:40,030 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-22 04:47:40,031 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-22 04:47:40,032 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-22 04:47:40,032 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-22 04:47:40,033 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-22 04:47:40,033 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-22 04:47:40,033 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 04:47:40,034 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 04:47:40,035 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 04:47:40,036 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 04:47:40,079 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 04:47:40,079 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 04:47:40,081 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 04:47:40,081 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 04:47:40,081 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 04:47:40,082 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 04:47:40,082 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 04:47:40,082 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 04:47:40,082 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 04:47:40,082 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 04:47:40,083 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 04:47:40,084 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 04:47:40,084 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 04:47:40,084 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 04:47:40,085 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 04:47:40,085 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 04:47:40,085 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 04:47:40,085 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 04:47:40,085 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 04:47:40,086 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 04:47:40,086 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 04:47:40,086 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 04:47:40,086 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 04:47:40,086 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 04:47:40,087 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 04:47:40,087 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 04:47:40,087 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 04:47:40,087 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 04:47:40,087 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 04:47:40,088 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=SMALLESTAMONGWIDE;tolerance=0.3;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3;log-additional-information=true; [2020-08-22 04:47:40,372 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 04:47:40,384 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 04:47:40,387 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 04:47:40,389 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 04:47:40,389 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 04:47:40,390 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-22 04:47:40,448 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/97a7d8fbf/333d42b431eb4235b26483be6cefe817/FLAG51861d5d4 [2020-08-22 04:47:40,865 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 04:47:40,868 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-22 04:47:40,872 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/97a7d8fbf/333d42b431eb4235b26483be6cefe817/FLAG51861d5d4 [2020-08-22 04:47:41,285 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/97a7d8fbf/333d42b431eb4235b26483be6cefe817 [2020-08-22 04:47:41,296 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 04:47:41,298 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 04:47:41,299 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 04:47:41,299 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 04:47:41,302 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 04:47:41,304 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:47:41" (1/1) ... [2020-08-22 04:47:41,307 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4147517c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:47:41, skipping insertion in model container [2020-08-22 04:47:41,307 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:47:41" (1/1) ... [2020-08-22 04:47:41,315 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 04:47:41,338 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 04:47:41,558 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 04:47:41,563 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 04:47:41,581 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 04:47:41,596 INFO L208 MainTranslator]: Completed translation [2020-08-22 04:47:41,597 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:47:41 WrapperNode [2020-08-22 04:47:41,597 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 04:47:41,598 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 04:47:41,598 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 04:47:41,598 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 04:47:41,612 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:47:41" (1/1) ... [2020-08-22 04:47:41,613 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:47:41" (1/1) ... [2020-08-22 04:47:41,709 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:47:41" (1/1) ... [2020-08-22 04:47:41,709 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:47:41" (1/1) ... [2020-08-22 04:47:41,713 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:47:41" (1/1) ... [2020-08-22 04:47:41,719 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:47:41" (1/1) ... [2020-08-22 04:47:41,720 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:47:41" (1/1) ... [2020-08-22 04:47:41,731 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 04:47:41,732 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 04:47:41,732 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 04:47:41,732 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 04:47:41,734 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:47:41" (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 04:47:41,785 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 04:47:41,786 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 04:47:41,786 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-22 04:47:41,786 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 04:47:41,786 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 04:47:41,787 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 04:47:41,787 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-22 04:47:41,787 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-22 04:47:41,787 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 04:47:41,787 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-22 04:47:41,787 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 04:47:41,787 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 04:47:41,788 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 04:47:42,052 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 04:47:42,053 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-22 04:47:42,069 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:47:42 BoogieIcfgContainer [2020-08-22 04:47:42,069 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 04:47:42,070 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 04:47:42,071 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 04:47:42,080 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 04:47:42,081 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 04:47:41" (1/3) ... [2020-08-22 04:47:42,082 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@cc89b89 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:47:42, skipping insertion in model container [2020-08-22 04:47:42,082 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:47:41" (2/3) ... [2020-08-22 04:47:42,083 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@cc89b89 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:47:42, skipping insertion in model container [2020-08-22 04:47:42,083 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:47:42" (3/3) ... [2020-08-22 04:47:42,088 INFO L109 eAbstractionObserver]: Analyzing ICFG ddlm2013.i [2020-08-22 04:47:42,111 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 04:47:42,121 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 04:47:42,133 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 04:47:42,154 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 04:47:42,154 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 04:47:42,155 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 04:47:42,155 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 04:47:42,155 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 04:47:42,155 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 04:47:42,155 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 04:47:42,155 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 04:47:42,175 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-08-22 04:47:42,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-22 04:47:42,180 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:42,181 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:42,182 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:42,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:42,187 INFO L82 PathProgramCache]: Analyzing trace with hash -917653371, now seen corresponding path program 1 times [2020-08-22 04:47:42,195 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:42,195 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1189620361] [2020-08-22 04:47:42,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:42,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:42,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:42,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:42,312 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 04:47:42,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1189620361] [2020-08-22 04:47:42,315 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 04:47:42,315 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-22 04:47:42,316 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644302451] [2020-08-22 04:47:42,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-22 04:47:42,321 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:42,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-22 04:47:42,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-22 04:47:42,335 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-08-22 04:47:42,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:42,357 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2020-08-22 04:47:42,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-22 04:47:42,358 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-08-22 04:47:42,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:42,368 INFO L225 Difference]: With dead ends: 35 [2020-08-22 04:47:42,368 INFO L226 Difference]: Without dead ends: 15 [2020-08-22 04:47:42,371 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-22 04:47:42,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-22 04:47:42,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-22 04:47:42,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-22 04:47:42,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-22 04:47:42,410 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 12 [2020-08-22 04:47:42,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:42,410 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-22 04:47:42,410 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-22 04:47:42,411 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-22 04:47:42,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-22 04:47:42,411 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:42,412 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:42,412 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 04:47:42,412 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:42,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:42,413 INFO L82 PathProgramCache]: Analyzing trace with hash -1750778295, now seen corresponding path program 1 times [2020-08-22 04:47:42,413 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:42,413 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [50483766] [2020-08-22 04:47:42,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:42,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:42,468 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:42,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:42,476 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:42,477 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [50483766] [2020-08-22 04:47:42,477 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 04:47:42,477 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 04:47:42,478 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330019947] [2020-08-22 04:47:42,480 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 04:47:42,480 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:42,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 04:47:42,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 04:47:42,481 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-22 04:47:42,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:42,498 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-22 04:47:42,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 04:47:42,498 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-08-22 04:47:42,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:42,500 INFO L225 Difference]: With dead ends: 24 [2020-08-22 04:47:42,500 INFO L226 Difference]: Without dead ends: 15 [2020-08-22 04:47:42,501 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 04:47:42,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-22 04:47:42,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-22 04:47:42,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-22 04:47:42,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-08-22 04:47:42,505 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2020-08-22 04:47:42,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:42,506 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-08-22 04:47:42,506 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 04:47:42,506 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-08-22 04:47:42,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-22 04:47:42,507 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:42,507 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:42,508 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 04:47:42,508 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:42,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:42,508 INFO L82 PathProgramCache]: Analyzing trace with hash -941431669, now seen corresponding path program 1 times [2020-08-22 04:47:42,509 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:42,509 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [569093516] [2020-08-22 04:47:42,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:42,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:42,772 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:42,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:42,779 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 04:47:42,780 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [569093516] [2020-08-22 04:47:42,780 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 04:47:42,781 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 04:47:42,781 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063104635] [2020-08-22 04:47:42,782 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 04:47:42,782 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:42,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 04:47:42,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 04:47:42,783 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2020-08-22 04:47:42,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:42,827 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2020-08-22 04:47:42,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 04:47:42,828 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-22 04:47:42,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:42,829 INFO L225 Difference]: With dead ends: 23 [2020-08-22 04:47:42,829 INFO L226 Difference]: Without dead ends: 17 [2020-08-22 04:47:42,830 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-22 04:47:42,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-22 04:47:42,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-22 04:47:42,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-22 04:47:42,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-08-22 04:47:42,835 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-08-22 04:47:42,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:42,835 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-08-22 04:47:42,835 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 04:47:42,836 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-08-22 04:47:42,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-22 04:47:42,837 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:42,837 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:42,837 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 04:47:42,838 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:42,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:42,839 INFO L82 PathProgramCache]: Analyzing trace with hash 447870728, now seen corresponding path program 1 times [2020-08-22 04:47:42,839 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:42,842 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1234211974] [2020-08-22 04:47:42,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:42,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:43,047 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 15 [2020-08-22 04:47:43,049 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:43,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:43,052 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:43,053 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1234211974] [2020-08-22 04:47:43,053 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 04:47:43,053 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 04:47:43,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856406276] [2020-08-22 04:47:43,054 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 04:47:43,054 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:43,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 04:47:43,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 04:47:43,055 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-08-22 04:47:43,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:43,077 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-08-22 04:47:43,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 04:47:43,078 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-08-22 04:47:43,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:43,079 INFO L225 Difference]: With dead ends: 26 [2020-08-22 04:47:43,079 INFO L226 Difference]: Without dead ends: 17 [2020-08-22 04:47:43,080 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 04:47:43,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-22 04:47:43,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-22 04:47:43,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-22 04:47:43,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-22 04:47:43,084 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 16 [2020-08-22 04:47:43,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:43,085 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-22 04:47:43,085 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 04:47:43,085 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-22 04:47:43,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-22 04:47:43,086 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:43,086 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:43,086 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 04:47:43,086 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:43,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:43,087 INFO L82 PathProgramCache]: Analyzing trace with hash 1257217354, now seen corresponding path program 1 times [2020-08-22 04:47:43,087 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:43,088 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1103183160] [2020-08-22 04:47:43,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:43,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:43,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:43,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:43,335 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:43,335 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1103183160] [2020-08-22 04:47:43,336 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:43,336 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 04:47:43,336 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [200590445] [2020-08-22 04:47:43,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 04:47:43,337 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:43,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 04:47:43,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-22 04:47:43,338 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2020-08-22 04:47:43,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:43,466 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-22 04:47:43,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 04:47:43,468 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-08-22 04:47:43,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:43,469 INFO L225 Difference]: With dead ends: 26 [2020-08-22 04:47:43,469 INFO L226 Difference]: Without dead ends: 20 [2020-08-22 04:47:43,471 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-22 04:47:43,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-22 04:47:43,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-22 04:47:43,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-22 04:47:43,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-22 04:47:43,481 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2020-08-22 04:47:43,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:43,481 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-22 04:47:43,481 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 04:47:43,481 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-22 04:47:43,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-22 04:47:43,482 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:43,483 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:43,483 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 04:47:43,483 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:43,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:43,484 INFO L82 PathProgramCache]: Analyzing trace with hash -1335969749, now seen corresponding path program 2 times [2020-08-22 04:47:43,484 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:43,485 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [795528522] [2020-08-22 04:47:43,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:43,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:43,762 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:43,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:43,769 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:43,769 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [795528522] [2020-08-22 04:47:43,770 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:43,770 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-22 04:47:43,770 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983304942] [2020-08-22 04:47:43,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 04:47:43,771 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:43,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 04:47:43,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-22 04:47:43,773 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2020-08-22 04:47:43,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:43,901 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-22 04:47:43,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 04:47:43,901 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-22 04:47:43,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:43,902 INFO L225 Difference]: With dead ends: 29 [2020-08-22 04:47:43,902 INFO L226 Difference]: Without dead ends: 23 [2020-08-22 04:47:43,903 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-22 04:47:43,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-22 04:47:43,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-22 04:47:43,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-22 04:47:43,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-22 04:47:43,908 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2020-08-22 04:47:43,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:43,908 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-22 04:47:43,908 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 04:47:43,908 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-22 04:47:43,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-22 04:47:43,909 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:43,909 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:43,909 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 04:47:43,910 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:43,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:43,910 INFO L82 PathProgramCache]: Analyzing trace with hash -1396202070, now seen corresponding path program 3 times [2020-08-22 04:47:43,910 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:43,911 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1469359743] [2020-08-22 04:47:43,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:43,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:44,185 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:44,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:44,190 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:44,190 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1469359743] [2020-08-22 04:47:44,191 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:44,191 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-22 04:47:44,191 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723526011] [2020-08-22 04:47:44,192 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 04:47:44,192 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:44,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 04:47:44,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-22 04:47:44,193 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 11 states. [2020-08-22 04:47:48,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:48,573 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-22 04:47:48,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-22 04:47:48,573 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2020-08-22 04:47:48,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:48,574 INFO L225 Difference]: With dead ends: 32 [2020-08-22 04:47:48,574 INFO L226 Difference]: Without dead ends: 26 [2020-08-22 04:47:48,575 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=33, Invalid=148, Unknown=1, NotChecked=0, Total=182 [2020-08-22 04:47:48,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-22 04:47:48,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-22 04:47:48,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-22 04:47:48,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-22 04:47:48,584 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2020-08-22 04:47:48,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:48,587 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-22 04:47:48,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 04:47:48,587 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-22 04:47:48,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-22 04:47:48,588 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:48,588 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:48,588 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 04:47:48,589 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:48,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:48,589 INFO L82 PathProgramCache]: Analyzing trace with hash -480947253, now seen corresponding path program 4 times [2020-08-22 04:47:48,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:48,590 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1766029170] [2020-08-22 04:47:48,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:48,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:48,953 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:48,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:48,961 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:48,961 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1766029170] [2020-08-22 04:47:48,961 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:48,961 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-22 04:47:48,962 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621592549] [2020-08-22 04:47:48,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 04:47:48,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:48,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 04:47:48,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-22 04:47:48,966 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 13 states. [2020-08-22 04:47:49,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:49,208 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-22 04:47:49,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 04:47:49,209 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2020-08-22 04:47:49,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:49,210 INFO L225 Difference]: With dead ends: 35 [2020-08-22 04:47:49,210 INFO L226 Difference]: Without dead ends: 29 [2020-08-22 04:47:49,212 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2020-08-22 04:47:49,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-22 04:47:49,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-22 04:47:49,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-22 04:47:49,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-22 04:47:49,220 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2020-08-22 04:47:49,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:49,223 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-22 04:47:49,223 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 04:47:49,223 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-22 04:47:49,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-22 04:47:49,224 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:49,225 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:49,225 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 04:47:49,225 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:49,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:49,226 INFO L82 PathProgramCache]: Analyzing trace with hash 1422910986, now seen corresponding path program 5 times [2020-08-22 04:47:49,226 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:49,227 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1132333956] [2020-08-22 04:47:49,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:49,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:49,704 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:49,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:49,710 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:49,712 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1132333956] [2020-08-22 04:47:49,714 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:49,714 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-22 04:47:49,715 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846361765] [2020-08-22 04:47:49,715 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-22 04:47:49,715 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:49,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-22 04:47:49,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-22 04:47:49,717 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2020-08-22 04:47:52,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:52,144 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-22 04:47:52,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-22 04:47:52,144 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2020-08-22 04:47:52,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:52,145 INFO L225 Difference]: With dead ends: 38 [2020-08-22 04:47:52,145 INFO L226 Difference]: Without dead ends: 32 [2020-08-22 04:47:52,146 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=41, Invalid=265, Unknown=0, NotChecked=0, Total=306 [2020-08-22 04:47:52,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-22 04:47:52,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-22 04:47:52,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-22 04:47:52,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-22 04:47:52,157 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2020-08-22 04:47:52,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:52,157 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-22 04:47:52,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-22 04:47:52,158 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-22 04:47:52,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-22 04:47:52,160 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:52,160 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:52,161 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 04:47:52,161 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:52,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:52,161 INFO L82 PathProgramCache]: Analyzing trace with hash -74401941, now seen corresponding path program 6 times [2020-08-22 04:47:52,161 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:52,161 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [277486204] [2020-08-22 04:47:52,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:52,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:52,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:52,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:52,627 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:52,627 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [277486204] [2020-08-22 04:47:52,627 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:52,627 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-22 04:47:52,628 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1896197906] [2020-08-22 04:47:52,628 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-22 04:47:52,628 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:52,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-22 04:47:52,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-22 04:47:52,629 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 17 states. [2020-08-22 04:48:03,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:48:03,722 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-22 04:48:03,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-22 04:48:03,722 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2020-08-22 04:48:03,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:48:03,723 INFO L225 Difference]: With dead ends: 41 [2020-08-22 04:48:03,723 INFO L226 Difference]: Without dead ends: 35 [2020-08-22 04:48:03,724 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=45, Invalid=334, Unknown=1, NotChecked=0, Total=380 [2020-08-22 04:48:03,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-22 04:48:03,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-22 04:48:03,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-22 04:48:03,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-22 04:48:03,728 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2020-08-22 04:48:03,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:48:03,729 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-22 04:48:03,729 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-22 04:48:03,729 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-22 04:48:03,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-22 04:48:03,730 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:48:03,730 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:48:03,730 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 04:48:03,730 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:48:03,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:48:03,730 INFO L82 PathProgramCache]: Analyzing trace with hash 1006526058, now seen corresponding path program 7 times [2020-08-22 04:48:03,731 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:48:03,731 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [144598806] [2020-08-22 04:48:03,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:48:03,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:48:04,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:48:04,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:48:04,318 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:48:04,319 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [144598806] [2020-08-22 04:48:04,319 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:48:04,320 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-22 04:48:04,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [309778938] [2020-08-22 04:48:04,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-22 04:48:04,321 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:48:04,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-22 04:48:04,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-22 04:48:04,322 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 19 states. [2020-08-22 04:48:10,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:48:10,947 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-22 04:48:10,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-22 04:48:10,947 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 34 [2020-08-22 04:48:10,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:48:10,948 INFO L225 Difference]: With dead ends: 44 [2020-08-22 04:48:10,949 INFO L226 Difference]: Without dead ends: 38 [2020-08-22 04:48:10,949 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=49, Invalid=412, Unknown=1, NotChecked=0, Total=462 [2020-08-22 04:48:10,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-22 04:48:10,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-22 04:48:10,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-22 04:48:10,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-22 04:48:10,954 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2020-08-22 04:48:10,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:48:10,954 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-22 04:48:10,955 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-22 04:48:10,955 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-22 04:48:10,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-22 04:48:10,956 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:48:10,956 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:48:10,956 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 04:48:10,956 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:48:10,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:48:10,957 INFO L82 PathProgramCache]: Analyzing trace with hash -732241141, now seen corresponding path program 8 times [2020-08-22 04:48:10,957 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:48:10,957 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [653597555] [2020-08-22 04:48:10,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:48:10,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:48:11,546 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:48:11,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:48:11,557 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:48:11,557 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [653597555] [2020-08-22 04:48:11,557 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:48:11,558 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-22 04:48:11,558 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324682789] [2020-08-22 04:48:11,560 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-22 04:48:11,560 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:48:11,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-22 04:48:11,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-22 04:48:11,561 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 21 states. [2020-08-22 04:48:12,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:48:12,021 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-22 04:48:12,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-22 04:48:12,023 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 37 [2020-08-22 04:48:12,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:48:12,024 INFO L225 Difference]: With dead ends: 47 [2020-08-22 04:48:12,024 INFO L226 Difference]: Without dead ends: 41 [2020-08-22 04:48:12,025 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=53, Invalid=499, Unknown=0, NotChecked=0, Total=552 [2020-08-22 04:48:12,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-22 04:48:12,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-22 04:48:12,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-22 04:48:12,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-22 04:48:12,035 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2020-08-22 04:48:12,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:48:12,035 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-22 04:48:12,036 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-22 04:48:12,036 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-22 04:48:12,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-22 04:48:12,040 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:48:12,040 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:48:12,040 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-22 04:48:12,040 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:48:12,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:48:12,041 INFO L82 PathProgramCache]: Analyzing trace with hash 1254690506, now seen corresponding path program 9 times [2020-08-22 04:48:12,041 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:48:12,041 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1390891686] [2020-08-22 04:48:12,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:48:12,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:48:12,826 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:48:12,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:48:12,837 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:48:12,837 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1390891686] [2020-08-22 04:48:12,838 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:48:12,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-22 04:48:12,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075212182] [2020-08-22 04:48:12,840 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-22 04:48:12,841 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:48:12,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-22 04:48:12,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-22 04:48:12,843 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 23 states. [2020-08-22 04:48:40,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:48:40,547 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-22 04:48:40,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-22 04:48:40,547 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 40 [2020-08-22 04:48:40,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:48:40,549 INFO L225 Difference]: With dead ends: 50 [2020-08-22 04:48:40,549 INFO L226 Difference]: Without dead ends: 44 [2020-08-22 04:48:40,550 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=57, Invalid=589, Unknown=4, NotChecked=0, Total=650 [2020-08-22 04:48:40,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-22 04:48:40,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-22 04:48:40,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-22 04:48:40,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-22 04:48:40,557 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2020-08-22 04:48:40,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:48:40,557 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-22 04:48:40,557 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-22 04:48:40,557 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-22 04:48:40,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-22 04:48:40,558 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:48:40,559 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:48:40,559 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-22 04:48:40,559 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:48:40,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:48:40,559 INFO L82 PathProgramCache]: Analyzing trace with hash 696112811, now seen corresponding path program 10 times [2020-08-22 04:48:40,560 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:48:40,562 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1594877389] [2020-08-22 04:48:40,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:48:40,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:48:41,404 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:48:41,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:48:41,413 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:48:41,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1594877389] [2020-08-22 04:48:41,414 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:48:41,414 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-22 04:48:41,414 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449809200] [2020-08-22 04:48:41,415 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-22 04:48:41,415 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:48:41,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-22 04:48:41,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-22 04:48:41,416 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 25 states.