/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=5 --traceabstraction.additional.smt.options interpolation-heuristic=DEEPEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 21:07:38,359 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 21:07:38,362 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 21:07:38,386 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 21:07:38,387 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 21:07:38,388 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 21:07:38,389 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 21:07:38,391 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 21:07:38,393 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 21:07:38,394 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 21:07:38,395 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 21:07:38,396 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 21:07:38,397 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 21:07:38,398 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 21:07:38,399 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 21:07:38,400 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 21:07:38,401 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 21:07:38,402 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 21:07:38,404 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 21:07:38,406 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 21:07:38,408 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 21:07:38,409 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 21:07:38,410 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 21:07:38,411 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 21:07:38,414 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 21:07:38,425 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 21:07:38,426 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 21:07:38,427 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 21:07:38,428 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 [2020-08-18 21:07:38,453 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 21:07:38,453 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 21:07:38,454 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 21:07:38,454 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 21:07:38,455 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 21:07:38,455 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 21:07:38,455 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 21:07:38,455 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 21:07:38,456 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 21:07:38,456 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 21:07:38,456 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 21:07:38,456 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 21:07:38,456 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 21:07:38,457 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 21:07:38,457 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 21:07:38,457 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 21:07:38,457 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 21:07:38,457 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 21:07:38,458 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 21:07:38,458 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 21:07:38,458 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 21:07:38,458 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 21:07:38,459 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 21:07:38,459 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 21:07:38,459 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 21:07:38,459 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 21:07:38,459 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 21:07:38,460 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 21:07:38,460 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 21:07:38,460 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=5;interpolation-heuristic=DEEPEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=DEEPEST; [2020-08-18 21:07:38,841 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 21:07:38,855 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 21:07:38,859 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 21:07:38,860 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 21:07:38,861 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 21:07:38,862 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-18 21:07:38,922 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/56d8c6bc3/b027746113354589b408d1ad9b9a3ad9/FLAG27b6c8ad6 [2020-08-18 21:07:39,355 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 21:07:39,356 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-18 21:07:39,363 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/56d8c6bc3/b027746113354589b408d1ad9b9a3ad9/FLAG27b6c8ad6 [2020-08-18 21:07:39,743 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/56d8c6bc3/b027746113354589b408d1ad9b9a3ad9 [2020-08-18 21:07:39,753 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 21:07:39,755 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 21:07:39,756 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 21:07:39,757 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 21:07:39,760 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 21:07:39,761 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 09:07:39" (1/1) ... [2020-08-18 21:07:39,764 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@fe964b5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:07:39, skipping insertion in model container [2020-08-18 21:07:39,764 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 09:07:39" (1/1) ... [2020-08-18 21:07:39,772 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 21:07:39,791 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 21:07:39,980 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 21:07:39,990 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 21:07:40,013 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 21:07:40,106 INFO L208 MainTranslator]: Completed translation [2020-08-18 21:07:40,107 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:07:40 WrapperNode [2020-08-18 21:07:40,107 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 21:07:40,108 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 21:07:40,109 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 21:07:40,109 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 21:07:40,123 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:07:40" (1/1) ... [2020-08-18 21:07:40,124 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:07:40" (1/1) ... [2020-08-18 21:07:40,146 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:07:40" (1/1) ... [2020-08-18 21:07:40,146 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:07:40" (1/1) ... [2020-08-18 21:07:40,156 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:07:40" (1/1) ... [2020-08-18 21:07:40,161 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:07:40" (1/1) ... [2020-08-18 21:07:40,163 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:07:40" (1/1) ... [2020-08-18 21:07:40,165 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 21:07:40,166 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 21:07:40,166 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 21:07:40,166 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 21:07:40,167 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:07:40" (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 [2020-08-18 21:07:40,227 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 21:07:40,227 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 21:07:40,227 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-18 21:07:40,227 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 21:07:40,227 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 21:07:40,228 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 21:07:40,228 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-18 21:07:40,228 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-18 21:07:40,228 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 21:07:40,228 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 21:07:40,228 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 21:07:40,228 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 21:07:40,229 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-18 21:07:40,229 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 21:07:40,229 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 21:07:40,229 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 21:07:40,527 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 21:07:40,527 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-18 21:07:40,532 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 09:07:40 BoogieIcfgContainer [2020-08-18 21:07:40,532 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 21:07:40,534 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 21:07:40,534 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 21:07:40,538 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 21:07:40,538 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 09:07:39" (1/3) ... [2020-08-18 21:07:40,539 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ec09240 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 09:07:40, skipping insertion in model container [2020-08-18 21:07:40,539 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:07:40" (2/3) ... [2020-08-18 21:07:40,540 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ec09240 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 09:07:40, skipping insertion in model container [2020-08-18 21:07:40,540 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 09:07:40" (3/3) ... [2020-08-18 21:07:40,542 INFO L109 eAbstractionObserver]: Analyzing ICFG test25-2.c [2020-08-18 21:07:40,557 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 21:07:40,564 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 21:07:40,581 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 21:07:40,607 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 21:07:40,607 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 21:07:40,607 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 21:07:40,608 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 21:07:40,608 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 21:07:40,608 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 21:07:40,608 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 21:07:40,608 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 21:07:40,630 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-18 21:07:40,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 21:07:40,637 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:07:40,638 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:07:40,639 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:07:40,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:07:40,646 INFO L82 PathProgramCache]: Analyzing trace with hash -899836778, now seen corresponding path program 1 times [2020-08-18 21:07:40,655 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:07:40,656 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1283204532] [2020-08-18 21:07:40,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:07:40,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:40,868 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:07:40,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:40,878 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-18 21:07:40,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:40,895 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:07:40,896 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1283204532] [2020-08-18 21:07:40,899 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:07:40,899 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 21:07:40,901 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [209397987] [2020-08-18 21:07:40,907 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 21:07:40,907 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:07:40,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 21:07:40,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 21:07:40,927 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-18 21:07:41,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:07:41,066 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2020-08-18 21:07:41,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 21:07:41,069 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-18 21:07:41,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:07:41,087 INFO L225 Difference]: With dead ends: 42 [2020-08-18 21:07:41,087 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 21:07:41,092 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 21:07:41,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 21:07:41,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 21:07:41,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 21:07:41,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-08-18 21:07:41,138 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-08-18 21:07:41,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:07:41,139 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-08-18 21:07:41,139 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 21:07:41,139 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-08-18 21:07:41,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 21:07:41,140 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:07:41,140 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:07:41,140 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 21:07:41,141 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:07:41,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:07:41,141 INFO L82 PathProgramCache]: Analyzing trace with hash -1137678901, now seen corresponding path program 1 times [2020-08-18 21:07:41,142 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:07:41,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [563802440] [2020-08-18 21:07:41,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:07:41,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:41,241 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:07:41,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:41,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-18 21:07:41,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:41,273 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:07:41,273 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [563802440] [2020-08-18 21:07:41,273 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:07:41,276 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 21:07:41,276 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285933174] [2020-08-18 21:07:41,279 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 21:07:41,279 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:07:41,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 21:07:41,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 21:07:41,280 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-08-18 21:07:41,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:07:41,364 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-08-18 21:07:41,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 21:07:41,364 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-08-18 21:07:41,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:07:41,366 INFO L225 Difference]: With dead ends: 34 [2020-08-18 21:07:41,366 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 21:07:41,367 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 21:07:41,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 21:07:41,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-18 21:07:41,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 21:07:41,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-18 21:07:41,374 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-08-18 21:07:41,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:07:41,375 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-18 21:07:41,375 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 21:07:41,375 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-18 21:07:41,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 21:07:41,376 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:07:41,377 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:07:41,377 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 21:07:41,377 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:07:41,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:07:41,378 INFO L82 PathProgramCache]: Analyzing trace with hash 278779309, now seen corresponding path program 1 times [2020-08-18 21:07:41,378 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:07:41,379 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2026535638] [2020-08-18 21:07:41,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:07:41,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:41,463 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:07:41,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:41,474 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-08-18 21:07:41,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:41,497 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:07:41,497 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2026535638] [2020-08-18 21:07:41,498 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:07:41,498 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 21:07:41,498 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1832355863] [2020-08-18 21:07:41,499 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 21:07:41,499 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:07:41,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 21:07:41,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 21:07:41,500 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-08-18 21:07:41,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:07:41,580 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-08-18 21:07:41,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 21:07:41,580 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-08-18 21:07:41,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:07:41,582 INFO L225 Difference]: With dead ends: 36 [2020-08-18 21:07:41,582 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 21:07:41,583 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 21:07:41,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 21:07:41,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-18 21:07:41,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 21:07:41,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-18 21:07:41,589 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-08-18 21:07:41,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:07:41,590 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-18 21:07:41,590 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 21:07:41,590 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-18 21:07:41,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 21:07:41,591 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:07:41,592 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:07:41,592 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 21:07:41,592 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:07:41,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:07:41,593 INFO L82 PathProgramCache]: Analyzing trace with hash -9513713, now seen corresponding path program 2 times [2020-08-18 21:07:41,593 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:07:41,594 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [312555345] [2020-08-18 21:07:41,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:07:41,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:41,729 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:07:41,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:41,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-18 21:07:41,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:41,741 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:07:41,741 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [312555345] [2020-08-18 21:07:41,742 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:07:41,742 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 21:07:41,742 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [836053760] [2020-08-18 21:07:41,743 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 21:07:41,743 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:07:41,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 21:07:41,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 21:07:41,744 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-08-18 21:07:41,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:07:41,841 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-08-18 21:07:41,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 21:07:41,842 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-18 21:07:41,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:07:41,843 INFO L225 Difference]: With dead ends: 38 [2020-08-18 21:07:41,843 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 21:07:41,844 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 21:07:41,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 21:07:41,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-18 21:07:41,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 21:07:41,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-18 21:07:41,850 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-08-18 21:07:41,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:07:41,851 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-18 21:07:41,851 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 21:07:41,851 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-18 21:07:41,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 21:07:41,852 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:07:41,852 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:07:41,852 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 21:07:41,853 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:07:41,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:07:41,853 INFO L82 PathProgramCache]: Analyzing trace with hash 2113766385, now seen corresponding path program 3 times [2020-08-18 21:07:41,853 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:07:41,854 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1340006602] [2020-08-18 21:07:41,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:07:41,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:41,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:07:41,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:41,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-18 21:07:41,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:41,938 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:07:41,938 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1340006602] [2020-08-18 21:07:41,939 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:07:41,939 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 21:07:41,939 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1162723700] [2020-08-18 21:07:41,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 21:07:41,940 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:07:41,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 21:07:41,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 21:07:41,941 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2020-08-18 21:07:42,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:07:42,008 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-08-18 21:07:42,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 21:07:42,009 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-08-18 21:07:42,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:07:42,010 INFO L225 Difference]: With dead ends: 40 [2020-08-18 21:07:42,010 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 21:07:42,011 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 21:07:42,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 21:07:42,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-18 21:07:42,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 21:07:42,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-18 21:07:42,016 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-08-18 21:07:42,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:07:42,017 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-18 21:07:42,017 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 21:07:42,017 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-18 21:07:42,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 21:07:42,018 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:07:42,018 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:07:42,018 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 21:07:42,018 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:07:42,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:07:42,019 INFO L82 PathProgramCache]: Analyzing trace with hash -1818492333, now seen corresponding path program 4 times [2020-08-18 21:07:42,019 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:07:42,019 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1165705446] [2020-08-18 21:07:42,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:07:42,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:42,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:07:42,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:42,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-18 21:07:42,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:42,123 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:07:42,124 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1165705446] [2020-08-18 21:07:42,124 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:07:42,124 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 21:07:42,125 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1236865219] [2020-08-18 21:07:42,125 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 21:07:42,125 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:07:42,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 21:07:42,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-18 21:07:42,126 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2020-08-18 21:07:42,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:07:42,194 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-08-18 21:07:42,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 21:07:42,195 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-08-18 21:07:42,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:07:42,196 INFO L225 Difference]: With dead ends: 42 [2020-08-18 21:07:42,196 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 21:07:42,197 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-18 21:07:42,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 21:07:42,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-18 21:07:42,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 21:07:42,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-08-18 21:07:42,202 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-08-18 21:07:42,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:07:42,203 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-08-18 21:07:42,203 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 21:07:42,203 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-08-18 21:07:42,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 21:07:42,204 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:07:42,204 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:07:42,204 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 21:07:42,204 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:07:42,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:07:42,205 INFO L82 PathProgramCache]: Analyzing trace with hash -1147899851, now seen corresponding path program 5 times [2020-08-18 21:07:42,205 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:07:42,205 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [348937412] [2020-08-18 21:07:42,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:07:42,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:42,293 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:07:42,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:42,296 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-18 21:07:42,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:42,302 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:07:42,302 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [348937412] [2020-08-18 21:07:42,302 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:07:42,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 21:07:42,303 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1766703990] [2020-08-18 21:07:42,303 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 21:07:42,304 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:07:42,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 21:07:42,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-18 21:07:42,304 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-08-18 21:07:42,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:07:42,391 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-08-18 21:07:42,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 21:07:42,391 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-08-18 21:07:42,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:07:42,392 INFO L225 Difference]: With dead ends: 44 [2020-08-18 21:07:42,393 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 21:07:42,393 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-18 21:07:42,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 21:07:42,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-18 21:07:42,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 21:07:42,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-08-18 21:07:42,400 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-08-18 21:07:42,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:07:42,400 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-08-18 21:07:42,400 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 21:07:42,400 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-08-18 21:07:42,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 21:07:42,402 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:07:42,402 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:07:42,402 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 21:07:42,403 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:07:42,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:07:42,403 INFO L82 PathProgramCache]: Analyzing trace with hash -953619049, now seen corresponding path program 6 times [2020-08-18 21:07:42,404 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:07:42,404 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [306661988] [2020-08-18 21:07:42,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:07:42,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:42,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:07:42,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:42,529 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-18 21:07:42,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:42,536 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:07:42,536 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [306661988] [2020-08-18 21:07:42,537 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:07:42,537 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 21:07:42,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979188712] [2020-08-18 21:07:42,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 21:07:42,538 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:07:42,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 21:07:42,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-18 21:07:42,539 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2020-08-18 21:07:42,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:07:42,643 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-08-18 21:07:42,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 21:07:42,643 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-08-18 21:07:42,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:07:42,644 INFO L225 Difference]: With dead ends: 46 [2020-08-18 21:07:42,644 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 21:07:42,645 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-18 21:07:42,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 21:07:42,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-18 21:07:42,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 21:07:42,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-18 21:07:42,651 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-08-18 21:07:42,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:07:42,652 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-18 21:07:42,652 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 21:07:42,652 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-18 21:07:42,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 21:07:42,653 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:07:42,653 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:07:42,653 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 21:07:42,654 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:07:42,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:07:42,654 INFO L82 PathProgramCache]: Analyzing trace with hash 1066637945, now seen corresponding path program 7 times [2020-08-18 21:07:42,654 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:07:42,655 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1073894594] [2020-08-18 21:07:42,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:07:42,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:42,768 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:07:42,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:42,772 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-18 21:07:42,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:42,789 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:07:42,789 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1073894594] [2020-08-18 21:07:42,789 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:07:42,789 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 21:07:42,790 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586921215] [2020-08-18 21:07:42,790 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 21:07:42,790 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:07:42,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 21:07:42,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-18 21:07:42,791 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-18 21:07:42,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:07:42,890 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-18 21:07:42,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 21:07:42,890 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-08-18 21:07:42,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:07:42,891 INFO L225 Difference]: With dead ends: 48 [2020-08-18 21:07:42,892 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 21:07:42,892 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-18 21:07:42,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 21:07:42,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-18 21:07:42,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 21:07:42,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-08-18 21:07:42,898 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-08-18 21:07:42,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:07:42,898 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-08-18 21:07:42,898 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 21:07:42,898 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-08-18 21:07:42,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 21:07:42,899 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:07:42,899 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:07:42,900 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 21:07:42,900 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:07:42,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:07:42,900 INFO L82 PathProgramCache]: Analyzing trace with hash 1208391387, now seen corresponding path program 8 times [2020-08-18 21:07:42,900 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:07:42,901 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [617852907] [2020-08-18 21:07:42,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:07:42,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:43,030 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:07:43,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:43,033 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-18 21:07:43,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:43,040 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:07:43,040 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [617852907] [2020-08-18 21:07:43,040 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:07:43,041 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 21:07:43,041 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1752988596] [2020-08-18 21:07:43,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 21:07:43,042 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:07:43,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 21:07:43,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-18 21:07:43,042 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 12 states. [2020-08-18 21:07:43,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:07:43,134 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-08-18 21:07:43,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 21:07:43,135 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-18 21:07:43,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:07:43,135 INFO L225 Difference]: With dead ends: 50 [2020-08-18 21:07:43,136 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 21:07:43,136 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-18 21:07:43,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 21:07:43,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-18 21:07:43,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 21:07:43,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-08-18 21:07:43,142 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-08-18 21:07:43,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:07:43,142 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-08-18 21:07:43,142 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 21:07:43,142 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-08-18 21:07:43,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 21:07:43,143 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:07:43,144 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:07:43,144 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 21:07:43,144 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:07:43,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:07:43,144 INFO L82 PathProgramCache]: Analyzing trace with hash -5504323, now seen corresponding path program 9 times [2020-08-18 21:07:43,145 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:07:43,145 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1481554731] [2020-08-18 21:07:43,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:07:43,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:43,276 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:07:43,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:43,279 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-18 21:07:43,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:43,283 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:07:43,284 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1481554731] [2020-08-18 21:07:43,284 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:07:43,284 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 21:07:43,285 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518217249] [2020-08-18 21:07:43,285 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 21:07:43,285 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:07:43,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 21:07:43,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-18 21:07:43,286 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 13 states. [2020-08-18 21:07:43,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:07:43,382 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-08-18 21:07:43,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 21:07:43,383 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-18 21:07:43,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:07:43,384 INFO L225 Difference]: With dead ends: 51 [2020-08-18 21:07:43,384 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 21:07:43,385 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-18 21:07:43,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 21:07:43,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 21:07:43,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 21:07:43,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-18 21:07:43,390 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-08-18 21:07:43,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:07:43,390 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-18 21:07:43,390 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 21:07:43,390 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-18 21:07:43,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 21:07:43,391 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:07:43,392 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:07:43,392 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 21:07:43,392 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:07:43,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:07:43,392 INFO L82 PathProgramCache]: Analyzing trace with hash 1671822879, now seen corresponding path program 10 times [2020-08-18 21:07:43,393 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:07:43,393 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1134118801] [2020-08-18 21:07:43,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:07:43,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:07:53,803 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 8 [2020-08-18 21:07:54,862 WARN L193 SmtUtils]: Spent 811.00 ms on a formula simplification. DAG size of input: 567 DAG size of output: 11 [2020-08-18 21:07:58,967 WARN L193 SmtUtils]: Spent 3.70 s on a formula simplification. DAG size of input: 1063 DAG size of output: 8 [2020-08-18 21:08:27,384 WARN L193 SmtUtils]: Spent 27.15 s on a formula simplification. DAG size of input: 2458 DAG size of output: 8 [2020-08-18 21:08:27,746 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:08:27,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:08:27,750 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-18 21:08:27,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:08:27,763 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 21:08:27,763 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1134118801] [2020-08-18 21:08:27,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:08:27,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 21:08:27,764 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570443487] [2020-08-18 21:08:27,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 21:08:27,766 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:08:27,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 21:08:27,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2020-08-18 21:08:27,767 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 16 states. [2020-08-18 21:08:28,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:08:28,233 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-18 21:08:28,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 21:08:28,234 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-18 21:08:28,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:08:28,235 INFO L225 Difference]: With dead ends: 49 [2020-08-18 21:08:28,235 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 21:08:28,236 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 33.7s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-18 21:08:28,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 21:08:28,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 21:08:28,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 21:08:28,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-08-18 21:08:28,247 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-08-18 21:08:28,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:08:28,247 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-08-18 21:08:28,247 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 21:08:28,247 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-08-18 21:08:28,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 21:08:28,250 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:08:28,251 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:08:28,251 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 21:08:28,251 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:08:28,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:08:28,252 INFO L82 PathProgramCache]: Analyzing trace with hash 443458522, now seen corresponding path program 1 times [2020-08-18 21:08:28,253 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:08:28,254 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1583676292] [2020-08-18 21:08:28,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:08:28,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:08:32,397 WARN L193 SmtUtils]: Spent 303.00 ms on a formula simplification. DAG size of input: 180 DAG size of output: 8 [2020-08-18 21:08:33,595 WARN L193 SmtUtils]: Spent 975.00 ms on a formula simplification. DAG size of input: 401 DAG size of output: 8 [2020-08-18 21:08:37,649 WARN L193 SmtUtils]: Spent 3.71 s on a formula simplification. DAG size of input: 830 DAG size of output: 8 [2020-08-18 21:08:38,161 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:08:38,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:08:38,174 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-18 21:08:38,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:08:38,225 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 101 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 21:08:38,225 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1583676292] [2020-08-18 21:08:38,226 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:08:38,226 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 21:08:38,226 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112439938] [2020-08-18 21:08:38,227 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 21:08:38,227 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:08:38,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 21:08:38,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=370, Unknown=0, NotChecked=0, Total=420 [2020-08-18 21:08:38,228 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 21 states. [2020-08-18 21:08:39,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:08:39,153 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-18 21:08:39,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 21:08:39,154 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 40 [2020-08-18 21:08:39,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:08:39,156 INFO L225 Difference]: With dead ends: 48 [2020-08-18 21:08:39,156 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 21:08:39,157 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=94, Invalid=718, Unknown=0, NotChecked=0, Total=812 [2020-08-18 21:08:39,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 21:08:39,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 21:08:39,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 21:08:39,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-08-18 21:08:39,166 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-08-18 21:08:39,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:08:39,167 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-08-18 21:08:39,167 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 21:08:39,167 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-08-18 21:08:39,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 21:08:39,168 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:08:39,168 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:08:39,168 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 21:08:39,168 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:08:39,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:08:39,169 INFO L82 PathProgramCache]: Analyzing trace with hash 1101317845, now seen corresponding path program 2 times [2020-08-18 21:08:39,169 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:08:39,169 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2034619725] [2020-08-18 21:08:39,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:08:39,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat