/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=LOWLEXORDER --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 [2020-08-21 18:16:43,171 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 18:16:43,174 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 18:16:43,198 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 18:16:43,198 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 18:16:43,199 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 18:16:43,201 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 18:16:43,202 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 18:16:43,204 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 18:16:43,205 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 18:16:43,206 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 18:16:43,207 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 18:16:43,207 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 18:16:43,208 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 18:16:43,210 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 18:16:43,211 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 18:16:43,212 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 18:16:43,213 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 18:16:43,214 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 18:16:43,216 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 18:16:43,218 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 18:16:43,219 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 18:16:43,220 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 18:16:43,221 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 18:16:43,223 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 18:16:43,230 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 18:16:43,230 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 18:16:43,231 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 18:16:43,235 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 18:16:43,236 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 18:16:43,237 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 18:16:43,238 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 18:16:43,238 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 18:16:43,239 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 18:16:43,240 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 18:16:43,240 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 18:16:43,242 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 18:16:43,291 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 18:16:43,291 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 18:16:43,295 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 18:16:43,295 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 18:16:43,295 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 18:16:43,295 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 18:16:43,296 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 18:16:43,297 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 18:16:43,297 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 18:16:43,297 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 18:16:43,297 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 18:16:43,297 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 18:16:43,298 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 18:16:43,299 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 18:16:43,299 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 18:16:43,299 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 18:16:43,299 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 18:16:43,300 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 18:16:43,300 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 18:16:43,300 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 18:16:43,300 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 18:16:43,300 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 18:16:43,301 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 18:16:43,301 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 18:16:43,301 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 18:16:43,301 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 18:16:43,301 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 18:16:43,301 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 18:16:43,302 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 18:16:43,302 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=LOWLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; [2020-08-21 18:16:43,629 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 18:16:43,641 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 18:16:43,645 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 18:16:43,647 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 18:16:43,647 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 18:16:43,648 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-21 18:16:43,711 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/739202f81/1763751918a74e20a24dfaa16f4a4dc8/FLAG4e0f7216a [2020-08-21 18:16:44,193 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 18:16:44,194 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-21 18:16:44,201 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/739202f81/1763751918a74e20a24dfaa16f4a4dc8/FLAG4e0f7216a [2020-08-21 18:16:44,549 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/739202f81/1763751918a74e20a24dfaa16f4a4dc8 [2020-08-21 18:16:44,559 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 18:16:44,560 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 18:16:44,561 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 18:16:44,561 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 18:16:44,565 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 18:16:44,566 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:16:44" (1/1) ... [2020-08-21 18:16:44,569 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@69a111ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:44, skipping insertion in model container [2020-08-21 18:16:44,570 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:16:44" (1/1) ... [2020-08-21 18:16:44,577 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 18:16:44,601 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 18:16:44,813 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:16:44,817 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 18:16:44,832 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:16:44,844 INFO L208 MainTranslator]: Completed translation [2020-08-21 18:16:44,845 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:44 WrapperNode [2020-08-21 18:16:44,845 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 18:16:44,846 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 18:16:44,846 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 18:16:44,846 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 18:16:44,856 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:44" (1/1) ... [2020-08-21 18:16:44,857 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:44" (1/1) ... [2020-08-21 18:16:44,862 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:44" (1/1) ... [2020-08-21 18:16:44,862 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:44" (1/1) ... [2020-08-21 18:16:44,866 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:44" (1/1) ... [2020-08-21 18:16:44,871 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:44" (1/1) ... [2020-08-21 18:16:44,872 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:44" (1/1) ... [2020-08-21 18:16:44,956 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 18:16:44,957 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 18:16:44,957 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 18:16:44,957 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 18:16:44,958 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:44" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 18:16:45,011 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 18:16:45,011 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 18:16:45,011 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 18:16:45,011 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 18:16:45,011 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 18:16:45,011 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 18:16:45,012 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 18:16:45,012 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 18:16:45,012 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 18:16:45,012 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 18:16:45,012 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 18:16:45,012 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 18:16:45,012 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 18:16:45,222 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 18:16:45,223 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 18:16:45,226 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:16:45 BoogieIcfgContainer [2020-08-21 18:16:45,227 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 18:16:45,228 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 18:16:45,228 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 18:16:45,232 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 18:16:45,232 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 06:16:44" (1/3) ... [2020-08-21 18:16:45,233 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@303b02b2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:16:45, skipping insertion in model container [2020-08-21 18:16:45,233 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:44" (2/3) ... [2020-08-21 18:16:45,234 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@303b02b2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:16:45, skipping insertion in model container [2020-08-21 18:16:45,234 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:16:45" (3/3) ... [2020-08-21 18:16:45,236 INFO L109 eAbstractionObserver]: Analyzing ICFG ddlm2013.i [2020-08-21 18:16:45,247 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 18:16:45,254 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 18:16:45,275 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 18:16:45,302 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 18:16:45,303 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 18:16:45,303 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 18:16:45,303 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 18:16:45,303 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 18:16:45,303 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 18:16:45,304 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 18:16:45,304 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 18:16:45,330 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-08-21 18:16:45,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 18:16:45,348 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:45,349 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:45,353 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:45,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:45,366 INFO L82 PathProgramCache]: Analyzing trace with hash -917653371, now seen corresponding path program 1 times [2020-08-21 18:16:45,377 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:45,378 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1660029312] [2020-08-21 18:16:45,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:45,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:45,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:45,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:45,508 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:45,509 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1660029312] [2020-08-21 18:16:45,511 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:16:45,512 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-21 18:16:45,513 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149646129] [2020-08-21 18:16:45,518 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-21 18:16:45,519 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:45,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-21 18:16:45,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 18:16:45,537 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-08-21 18:16:45,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:45,563 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2020-08-21 18:16:45,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-21 18:16:45,565 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-08-21 18:16:45,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:45,575 INFO L225 Difference]: With dead ends: 35 [2020-08-21 18:16:45,575 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 18:16:45,579 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 [2020-08-21 18:16:45,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 18:16:45,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 18:16:45,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 18:16:45,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-21 18:16:45,623 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 12 [2020-08-21 18:16:45,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:45,623 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-21 18:16:45,623 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-21 18:16:45,624 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-21 18:16:45,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 18:16:45,624 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:45,625 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:45,625 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 18:16:45,626 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:45,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:45,626 INFO L82 PathProgramCache]: Analyzing trace with hash -1750778295, now seen corresponding path program 1 times [2020-08-21 18:16:45,627 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:45,627 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1158817876] [2020-08-21 18:16:45,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:45,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:45,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:45,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:45,678 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:45,678 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1158817876] [2020-08-21 18:16:45,678 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:16:45,679 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 18:16:45,679 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993622557] [2020-08-21 18:16:45,681 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 18:16:45,681 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:45,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 18:16:45,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 18:16:45,682 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-21 18:16:45,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:45,701 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-21 18:16:45,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 18:16:45,702 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-08-21 18:16:45,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:45,703 INFO L225 Difference]: With dead ends: 24 [2020-08-21 18:16:45,703 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 18:16:45,704 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 [2020-08-21 18:16:45,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 18:16:45,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 18:16:45,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 18:16:45,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-08-21 18:16:45,709 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2020-08-21 18:16:45,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:45,709 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-08-21 18:16:45,709 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 18:16:45,710 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-08-21 18:16:45,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 18:16:45,710 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:45,711 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:45,711 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 18:16:45,711 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:45,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:45,712 INFO L82 PathProgramCache]: Analyzing trace with hash -941431669, now seen corresponding path program 1 times [2020-08-21 18:16:45,712 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:45,712 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1923240336] [2020-08-21 18:16:45,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:45,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:45,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:45,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:45,958 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:45,958 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1923240336] [2020-08-21 18:16:45,959 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:16:45,959 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 18:16:45,959 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063076311] [2020-08-21 18:16:45,960 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 18:16:45,960 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:45,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 18:16:45,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:16:45,961 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2020-08-21 18:16:46,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:46,031 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2020-08-21 18:16:46,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 18:16:46,033 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-21 18:16:46,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:46,035 INFO L225 Difference]: With dead ends: 23 [2020-08-21 18:16:46,035 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 18:16:46,036 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 [2020-08-21 18:16:46,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 18:16:46,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 18:16:46,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 18:16:46,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-08-21 18:16:46,045 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-08-21 18:16:46,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:46,045 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-08-21 18:16:46,045 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 18:16:46,045 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-08-21 18:16:46,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 18:16:46,047 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:46,047 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:46,047 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 18:16:46,047 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:46,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:46,048 INFO L82 PathProgramCache]: Analyzing trace with hash 447870728, now seen corresponding path program 1 times [2020-08-21 18:16:46,049 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:46,049 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1220585377] [2020-08-21 18:16:46,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:46,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:46,232 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 15 [2020-08-21 18:16:46,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:46,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:46,238 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:46,238 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1220585377] [2020-08-21 18:16:46,238 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:16:46,239 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 18:16:46,239 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651604492] [2020-08-21 18:16:46,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 18:16:46,240 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:46,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 18:16:46,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 18:16:46,240 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-08-21 18:16:46,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:46,273 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-08-21 18:16:46,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 18:16:46,274 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-08-21 18:16:46,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:46,275 INFO L225 Difference]: With dead ends: 26 [2020-08-21 18:16:46,275 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 18:16:46,276 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 [2020-08-21 18:16:46,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 18:16:46,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 18:16:46,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 18:16:46,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 18:16:46,281 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 16 [2020-08-21 18:16:46,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:46,282 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 18:16:46,282 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 18:16:46,282 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 18:16:46,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 18:16:46,283 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:46,283 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:46,283 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 18:16:46,284 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:46,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:46,284 INFO L82 PathProgramCache]: Analyzing trace with hash 1257217354, now seen corresponding path program 1 times [2020-08-21 18:16:46,284 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:46,285 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1070257770] [2020-08-21 18:16:46,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:46,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:46,552 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:46,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:46,562 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:46,563 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1070257770] [2020-08-21 18:16:46,563 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:46,563 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 18:16:46,564 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776013667] [2020-08-21 18:16:46,564 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 18:16:46,565 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:46,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 18:16:46,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-21 18:16:46,570 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2020-08-21 18:16:46,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:46,715 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-21 18:16:46,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 18:16:46,716 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-08-21 18:16:46,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:46,717 INFO L225 Difference]: With dead ends: 26 [2020-08-21 18:16:46,718 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 18:16:46,719 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-21 18:16:46,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 18:16:46,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 18:16:46,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 18:16:46,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-21 18:16:46,724 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2020-08-21 18:16:46,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:46,724 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-21 18:16:46,724 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 18:16:46,725 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-21 18:16:46,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 18:16:46,726 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:46,726 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:46,726 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 18:16:46,726 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:46,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:46,727 INFO L82 PathProgramCache]: Analyzing trace with hash -1335969749, now seen corresponding path program 2 times [2020-08-21 18:16:46,727 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:46,728 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1102834949] [2020-08-21 18:16:46,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:46,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:46,998 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:46,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:47,005 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:47,006 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1102834949] [2020-08-21 18:16:47,006 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:47,006 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 18:16:47,006 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929838318] [2020-08-21 18:16:47,008 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 18:16:47,008 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:47,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 18:16:47,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-21 18:16:47,009 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2020-08-21 18:16:47,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:47,153 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-21 18:16:47,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 18:16:47,154 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-21 18:16:47,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:47,155 INFO L225 Difference]: With dead ends: 29 [2020-08-21 18:16:47,155 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 18:16:47,156 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 [2020-08-21 18:16:47,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 18:16:47,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-21 18:16:47,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 18:16:47,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 18:16:47,170 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2020-08-21 18:16:47,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:47,171 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 18:16:47,171 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 18:16:47,171 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 18:16:47,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 18:16:47,173 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:47,174 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:47,174 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 18:16:47,174 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:47,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:47,175 INFO L82 PathProgramCache]: Analyzing trace with hash -1396202070, now seen corresponding path program 3 times [2020-08-21 18:16:47,175 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:47,175 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1684827423] [2020-08-21 18:16:47,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:47,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:47,458 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:47,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:47,463 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:47,463 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1684827423] [2020-08-21 18:16:47,463 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:47,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 18:16:47,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054121868] [2020-08-21 18:16:47,464 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 18:16:47,465 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:47,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 18:16:47,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-21 18:16:47,465 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 11 states. [2020-08-21 18:16:53,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:53,919 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-21 18:16:53,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 18:16:53,919 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2020-08-21 18:16:53,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:53,920 INFO L225 Difference]: With dead ends: 32 [2020-08-21 18:16:53,920 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 18:16:53,921 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=33, Invalid=147, Unknown=2, NotChecked=0, Total=182 [2020-08-21 18:16:53,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 18:16:53,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-21 18:16:53,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 18:16:53,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-21 18:16:53,930 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2020-08-21 18:16:53,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:53,931 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-21 18:16:53,931 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 18:16:53,931 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-21 18:16:53,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 18:16:53,933 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:53,933 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:53,934 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 18:16:53,934 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:53,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:53,935 INFO L82 PathProgramCache]: Analyzing trace with hash -480947253, now seen corresponding path program 4 times [2020-08-21 18:16:53,936 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:53,936 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1567641978] [2020-08-21 18:16:53,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:53,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:54,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:54,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:54,368 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:54,369 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1567641978] [2020-08-21 18:16:54,369 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:54,369 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 18:16:54,369 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705893421] [2020-08-21 18:16:54,372 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 18:16:54,372 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:54,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 18:16:54,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-21 18:16:54,375 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 13 states. [2020-08-21 18:16:54,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:54,627 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-21 18:16:54,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 18:16:54,628 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2020-08-21 18:16:54,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:54,629 INFO L225 Difference]: With dead ends: 35 [2020-08-21 18:16:54,629 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 18:16:54,630 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 [2020-08-21 18:16:54,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 18:16:54,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-21 18:16:54,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 18:16:54,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-21 18:16:54,641 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2020-08-21 18:16:54,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:54,641 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-21 18:16:54,641 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 18:16:54,641 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-21 18:16:54,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 18:16:54,644 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:54,645 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:54,645 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 18:16:54,645 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:54,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:54,646 INFO L82 PathProgramCache]: Analyzing trace with hash 1422910986, now seen corresponding path program 5 times [2020-08-21 18:16:54,646 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:54,647 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [487178054] [2020-08-21 18:16:54,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:54,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:55,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:55,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:55,086 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:55,086 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [487178054] [2020-08-21 18:16:55,086 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:55,087 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 18:16:55,087 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320573693] [2020-08-21 18:16:55,087 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 18:16:55,088 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:55,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 18:16:55,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-21 18:16:55,089 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2020-08-21 18:16:59,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:59,504 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-21 18:16:59,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 18:16:59,504 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2020-08-21 18:16:59,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:59,505 INFO L225 Difference]: With dead ends: 38 [2020-08-21 18:16:59,505 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 18:16:59,511 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=41, Invalid=264, Unknown=1, NotChecked=0, Total=306 [2020-08-21 18:16:59,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 18:16:59,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-21 18:16:59,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 18:16:59,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-21 18:16:59,516 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2020-08-21 18:16:59,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:59,518 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-21 18:16:59,518 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 18:16:59,518 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-21 18:16:59,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 18:16:59,519 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:59,519 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:59,520 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 18:16:59,520 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:59,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:59,520 INFO L82 PathProgramCache]: Analyzing trace with hash -74401941, now seen corresponding path program 6 times [2020-08-21 18:16:59,521 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:59,523 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [638395181] [2020-08-21 18:16:59,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:59,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:00,059 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:00,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:00,065 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:00,066 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [638395181] [2020-08-21 18:17:00,066 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:00,067 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 18:17:00,067 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5044181] [2020-08-21 18:17:00,068 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 18:17:00,068 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:00,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 18:17:00,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-21 18:17:00,069 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 17 states. [2020-08-21 18:17:10,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:10,907 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-21 18:17:10,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 18:17:10,908 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2020-08-21 18:17:10,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:10,908 INFO L225 Difference]: With dead ends: 41 [2020-08-21 18:17:10,909 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 18:17:10,909 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=45, Invalid=333, Unknown=2, NotChecked=0, Total=380 [2020-08-21 18:17:10,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 18:17:10,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-21 18:17:10,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 18:17:10,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-21 18:17:10,914 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2020-08-21 18:17:10,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:10,915 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-21 18:17:10,915 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 18:17:10,915 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-21 18:17:10,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 18:17:10,916 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:10,916 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:10,916 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 18:17:10,916 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:10,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:10,917 INFO L82 PathProgramCache]: Analyzing trace with hash 1006526058, now seen corresponding path program 7 times [2020-08-21 18:17:10,917 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:10,917 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1166011279] [2020-08-21 18:17:10,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:10,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:11,492 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:11,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:11,499 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:11,499 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1166011279] [2020-08-21 18:17:11,500 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:11,500 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 18:17:11,500 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1025897512] [2020-08-21 18:17:11,501 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 18:17:11,501 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:11,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 18:17:11,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-21 18:17:11,501 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 19 states. [2020-08-21 18:17:24,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:24,455 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 18:17:24,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 18:17:24,455 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 34 [2020-08-21 18:17:24,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:24,456 INFO L225 Difference]: With dead ends: 44 [2020-08-21 18:17:24,457 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 18:17:24,457 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 [2020-08-21 18:17:24,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 18:17:24,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-21 18:17:24,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 18:17:24,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-21 18:17:24,471 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2020-08-21 18:17:24,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:24,472 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-21 18:17:24,472 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 18:17:24,472 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-21 18:17:24,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 18:17:24,473 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:24,473 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:24,474 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 18:17:24,474 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:24,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:24,474 INFO L82 PathProgramCache]: Analyzing trace with hash -732241141, now seen corresponding path program 8 times [2020-08-21 18:17:24,474 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:24,477 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1581851833] [2020-08-21 18:17:24,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:24,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:25,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:25,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:25,136 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:25,136 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1581851833] [2020-08-21 18:17:25,136 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:25,137 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 18:17:25,137 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2048907922] [2020-08-21 18:17:25,137 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 18:17:25,138 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:25,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 18:17:25,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-21 18:17:25,138 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 21 states. [2020-08-21 18:17:25,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:25,601 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-21 18:17:25,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 18:17:25,603 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 37 [2020-08-21 18:17:25,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:25,604 INFO L225 Difference]: With dead ends: 47 [2020-08-21 18:17:25,604 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 18:17:25,605 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 [2020-08-21 18:17:25,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 18:17:25,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 18:17:25,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 18:17:25,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-21 18:17:25,609 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2020-08-21 18:17:25,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:25,610 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-21 18:17:25,610 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 18:17:25,610 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-21 18:17:25,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 18:17:25,611 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:25,611 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:25,611 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 18:17:25,612 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:25,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:25,612 INFO L82 PathProgramCache]: Analyzing trace with hash 1254690506, now seen corresponding path program 9 times [2020-08-21 18:17:25,612 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:25,612 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2097941979] [2020-08-21 18:17:25,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:25,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:26,359 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:26,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:26,370 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:26,371 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2097941979] [2020-08-21 18:17:26,371 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:26,372 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 18:17:26,372 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [723463362] [2020-08-21 18:17:26,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 18:17:26,373 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:26,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 18:17:26,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-21 18:17:26,374 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 23 states. [2020-08-21 18:17:43,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:43,596 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-21 18:17:43,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 18:17:43,597 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 40 [2020-08-21 18:17:43,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:43,598 INFO L225 Difference]: With dead ends: 50 [2020-08-21 18:17:43,598 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 18:17:43,599 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=57, Invalid=587, Unknown=6, NotChecked=0, Total=650 [2020-08-21 18:17:43,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 18:17:43,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-21 18:17:43,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 18:17:43,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-21 18:17:43,603 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2020-08-21 18:17:43,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:43,604 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-21 18:17:43,604 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 18:17:43,604 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-21 18:17:43,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 18:17:43,605 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:43,605 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:43,605 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 18:17:43,605 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:43,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:43,606 INFO L82 PathProgramCache]: Analyzing trace with hash 696112811, now seen corresponding path program 10 times [2020-08-21 18:17:43,606 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:43,606 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [743815446] [2020-08-21 18:17:43,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:43,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:44,456 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:44,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:44,466 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:44,466 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [743815446] [2020-08-21 18:17:44,466 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:44,467 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 18:17:44,467 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619716713] [2020-08-21 18:17:44,467 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 18:17:44,467 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:44,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 18:17:44,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-21 18:17:44,468 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 25 states.