/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=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/ddlm2013.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 06:08:16,487 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 06:08:16,489 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 06:08:16,516 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 06:08:16,517 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 06:08:16,518 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 06:08:16,523 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 06:08:16,527 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 06:08:16,530 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 06:08:16,531 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 06:08:16,532 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 06:08:16,533 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 06:08:16,533 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 06:08:16,535 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 06:08:16,536 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 06:08:16,538 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 06:08:16,540 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 06:08:16,540 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 06:08:16,544 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 06:08:16,546 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 06:08:16,549 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 06:08:16,550 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 06:08:16,551 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 06:08:16,552 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 06:08:16,559 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-19 06:08:16,560 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-19 06:08:16,560 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-19 06:08:16,563 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-19 06:08:16,563 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-19 06:08:16,565 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-19 06:08:16,578 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 06:08:16,580 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 06:08:16,584 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 06:08:16,585 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 [2020-08-19 06:08:16,623 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 06:08:16,624 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 06:08:16,626 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 06:08:16,626 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 06:08:16,626 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 06:08:16,626 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 06:08:16,626 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 06:08:16,627 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 06:08:16,627 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 06:08:16,627 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 06:08:16,628 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 06:08:16,628 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 06:08:16,628 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 06:08:16,629 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 06:08:16,629 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 06:08:16,629 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 06:08:16,629 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 06:08:16,629 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 06:08:16,630 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 06:08:16,630 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 06:08:16,630 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 06:08:16,630 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 06:08:16,630 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 06:08:16,631 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 06:08:16,631 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 06:08:16,631 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 06:08:16,631 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 06:08:16,631 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 06:08:16,631 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 06:08:16,632 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=SMALLESTAMONGWIDE;tolerance=0.4; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.4; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.4; [2020-08-19 06:08:16,944 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 06:08:16,960 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 06:08:16,970 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 06:08:16,971 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 06:08:16,972 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 06:08:16,972 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-19 06:08:17,036 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5ba9f9b6c/7591dea9452543b69046436aef9c6f7b/FLAGea1e758b6 [2020-08-19 06:08:17,470 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 06:08:17,470 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-19 06:08:17,476 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5ba9f9b6c/7591dea9452543b69046436aef9c6f7b/FLAGea1e758b6 [2020-08-19 06:08:17,926 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5ba9f9b6c/7591dea9452543b69046436aef9c6f7b [2020-08-19 06:08:17,936 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 06:08:17,938 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 06:08:17,939 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 06:08:17,939 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 06:08:17,942 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 06:08:17,944 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 06:08:17" (1/1) ... [2020-08-19 06:08:17,947 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@361633d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:08:17, skipping insertion in model container [2020-08-19 06:08:17,947 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 06:08:17" (1/1) ... [2020-08-19 06:08:17,955 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 06:08:17,975 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 06:08:18,141 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 06:08:18,144 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 06:08:18,158 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 06:08:18,170 INFO L208 MainTranslator]: Completed translation [2020-08-19 06:08:18,170 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:08:18 WrapperNode [2020-08-19 06:08:18,170 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 06:08:18,171 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 06:08:18,171 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 06:08:18,171 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 06:08:18,180 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:08:18" (1/1) ... [2020-08-19 06:08:18,181 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:08:18" (1/1) ... [2020-08-19 06:08:18,255 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:08:18" (1/1) ... [2020-08-19 06:08:18,256 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:08:18" (1/1) ... [2020-08-19 06:08:18,260 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:08:18" (1/1) ... [2020-08-19 06:08:18,265 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:08:18" (1/1) ... [2020-08-19 06:08:18,266 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:08:18" (1/1) ... [2020-08-19 06:08:18,267 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 06:08:18,268 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 06:08:18,268 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 06:08:18,268 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 06:08:18,269 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:08:18" (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 [2020-08-19 06:08:18,320 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 06:08:18,320 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 06:08:18,320 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-19 06:08:18,320 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 06:08:18,320 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 06:08:18,320 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 06:08:18,320 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-19 06:08:18,321 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-19 06:08:18,321 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 06:08:18,321 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-19 06:08:18,321 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 06:08:18,321 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 06:08:18,321 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 06:08:18,543 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 06:08:18,544 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-19 06:08:18,547 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 06:08:18 BoogieIcfgContainer [2020-08-19 06:08:18,547 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 06:08:18,549 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 06:08:18,549 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 06:08:18,552 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 06:08:18,552 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 06:08:17" (1/3) ... [2020-08-19 06:08:18,553 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b0f6e12 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 06:08:18, skipping insertion in model container [2020-08-19 06:08:18,553 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:08:18" (2/3) ... [2020-08-19 06:08:18,553 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b0f6e12 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 06:08:18, skipping insertion in model container [2020-08-19 06:08:18,554 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 06:08:18" (3/3) ... [2020-08-19 06:08:18,555 INFO L109 eAbstractionObserver]: Analyzing ICFG ddlm2013.i [2020-08-19 06:08:18,566 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 06:08:18,574 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 06:08:18,588 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 06:08:18,613 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 06:08:18,613 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 06:08:18,613 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 06:08:18,613 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 06:08:18,613 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 06:08:18,614 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 06:08:18,614 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 06:08:18,614 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 06:08:18,639 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-08-19 06:08:18,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-19 06:08:18,648 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:18,649 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:18,663 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:18,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:18,672 INFO L82 PathProgramCache]: Analyzing trace with hash -917653371, now seen corresponding path program 1 times [2020-08-19 06:08:18,688 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:18,688 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [729497040] [2020-08-19 06:08:18,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:18,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:18,802 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:18,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:18,808 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:08:18,809 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [729497040] [2020-08-19 06:08:18,810 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:08:18,810 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-19 06:08:18,811 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006270687] [2020-08-19 06:08:18,815 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-19 06:08:18,816 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:18,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-19 06:08:18,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-19 06:08:18,828 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-08-19 06:08:18,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:18,847 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2020-08-19 06:08:18,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-19 06:08:18,848 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-08-19 06:08:18,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:18,855 INFO L225 Difference]: With dead ends: 35 [2020-08-19 06:08:18,856 INFO L226 Difference]: Without dead ends: 15 [2020-08-19 06:08:18,859 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 [2020-08-19 06:08:18,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-19 06:08:18,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-19 06:08:18,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 06:08:18,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-19 06:08:18,892 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 12 [2020-08-19 06:08:18,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:18,892 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-19 06:08:18,893 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-19 06:08:18,893 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-19 06:08:18,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-19 06:08:18,893 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:18,894 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:18,894 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 06:08:18,894 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:18,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:18,895 INFO L82 PathProgramCache]: Analyzing trace with hash -1750778295, now seen corresponding path program 1 times [2020-08-19 06:08:18,896 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:18,896 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [684772046] [2020-08-19 06:08:18,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:18,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:18,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:18,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:18,939 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:08:18,939 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [684772046] [2020-08-19 06:08:18,940 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:08:18,940 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 06:08:18,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088625838] [2020-08-19 06:08:18,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 06:08:18,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:18,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 06:08:18,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 06:08:18,943 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-19 06:08:18,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:18,963 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-19 06:08:18,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 06:08:18,964 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-08-19 06:08:18,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:18,966 INFO L225 Difference]: With dead ends: 24 [2020-08-19 06:08:18,966 INFO L226 Difference]: Without dead ends: 15 [2020-08-19 06:08:18,967 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 [2020-08-19 06:08:18,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-19 06:08:18,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-19 06:08:18,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 06:08:18,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-08-19 06:08:18,972 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2020-08-19 06:08:18,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:18,972 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-08-19 06:08:18,973 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 06:08:18,973 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-08-19 06:08:18,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-19 06:08:18,974 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:18,974 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:18,974 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 06:08:18,974 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:18,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:18,975 INFO L82 PathProgramCache]: Analyzing trace with hash -941431669, now seen corresponding path program 1 times [2020-08-19 06:08:18,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:18,976 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1173280485] [2020-08-19 06:08:18,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:19,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:19,262 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:19,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:19,267 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:08:19,268 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1173280485] [2020-08-19 06:08:19,268 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:08:19,268 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 06:08:19,269 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740814090] [2020-08-19 06:08:19,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 06:08:19,270 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:19,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 06:08:19,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 06:08:19,271 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2020-08-19 06:08:19,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:19,306 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2020-08-19 06:08:19,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 06:08:19,307 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-19 06:08:19,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:19,308 INFO L225 Difference]: With dead ends: 23 [2020-08-19 06:08:19,308 INFO L226 Difference]: Without dead ends: 17 [2020-08-19 06:08:19,309 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 [2020-08-19 06:08:19,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-19 06:08:19,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-19 06:08:19,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 06:08:19,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-08-19 06:08:19,314 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-08-19 06:08:19,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:19,314 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-08-19 06:08:19,314 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 06:08:19,315 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-08-19 06:08:19,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 06:08:19,315 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:19,316 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:19,316 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 06:08:19,316 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:19,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:19,317 INFO L82 PathProgramCache]: Analyzing trace with hash 447870728, now seen corresponding path program 1 times [2020-08-19 06:08:19,317 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:19,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1748462031] [2020-08-19 06:08:19,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:19,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:19,510 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:19,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:19,518 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:08:19,518 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1748462031] [2020-08-19 06:08:19,518 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:08:19,519 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 06:08:19,519 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745882643] [2020-08-19 06:08:19,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 06:08:19,520 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:19,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 06:08:19,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 06:08:19,520 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-08-19 06:08:19,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:19,543 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-08-19 06:08:19,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 06:08:19,544 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-08-19 06:08:19,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:19,545 INFO L225 Difference]: With dead ends: 26 [2020-08-19 06:08:19,545 INFO L226 Difference]: Without dead ends: 17 [2020-08-19 06:08:19,546 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 [2020-08-19 06:08:19,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-19 06:08:19,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-19 06:08:19,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 06:08:19,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-19 06:08:19,550 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 16 [2020-08-19 06:08:19,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:19,551 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-19 06:08:19,551 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 06:08:19,551 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-19 06:08:19,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 06:08:19,552 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:19,552 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:19,552 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 06:08:19,553 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:19,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:19,553 INFO L82 PathProgramCache]: Analyzing trace with hash 1257217354, now seen corresponding path program 1 times [2020-08-19 06:08:19,553 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:19,554 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [862644766] [2020-08-19 06:08:19,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:19,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:19,771 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:19,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:19,776 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:08:19,776 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [862644766] [2020-08-19 06:08:19,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:19,777 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 06:08:19,777 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878421199] [2020-08-19 06:08:19,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 06:08:19,778 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:19,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 06:08:19,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-19 06:08:19,779 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2020-08-19 06:08:19,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:19,881 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-19 06:08:19,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 06:08:19,882 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-08-19 06:08:19,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:19,883 INFO L225 Difference]: With dead ends: 26 [2020-08-19 06:08:19,883 INFO L226 Difference]: Without dead ends: 20 [2020-08-19 06:08:19,884 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-19 06:08:19,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-19 06:08:19,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-19 06:08:19,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-19 06:08:19,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-19 06:08:19,889 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2020-08-19 06:08:19,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:19,889 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-19 06:08:19,889 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 06:08:19,890 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-19 06:08:19,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-19 06:08:19,890 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:19,890 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:19,891 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 06:08:19,891 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:19,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:19,891 INFO L82 PathProgramCache]: Analyzing trace with hash -1335969749, now seen corresponding path program 2 times [2020-08-19 06:08:19,892 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:19,892 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [362019915] [2020-08-19 06:08:19,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:19,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:20,111 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:20,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:20,115 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:08:20,115 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [362019915] [2020-08-19 06:08:20,115 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:20,116 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 06:08:20,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739981810] [2020-08-19 06:08:20,116 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 06:08:20,117 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:20,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 06:08:20,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-19 06:08:20,117 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2020-08-19 06:08:20,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:20,239 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-19 06:08:20,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 06:08:20,239 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-19 06:08:20,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:20,240 INFO L225 Difference]: With dead ends: 29 [2020-08-19 06:08:20,241 INFO L226 Difference]: Without dead ends: 23 [2020-08-19 06:08:20,241 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-19 06:08:20,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-19 06:08:20,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-19 06:08:20,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-19 06:08:20,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-19 06:08:20,250 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2020-08-19 06:08:20,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:20,251 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-19 06:08:20,251 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 06:08:20,251 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-19 06:08:20,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-19 06:08:20,252 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:20,252 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:20,253 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 06:08:20,253 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:20,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:20,254 INFO L82 PathProgramCache]: Analyzing trace with hash -1396202070, now seen corresponding path program 3 times [2020-08-19 06:08:20,254 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:20,254 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [268533814] [2020-08-19 06:08:20,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:20,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:20,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:20,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:20,531 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:08:20,532 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [268533814] [2020-08-19 06:08:20,532 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:20,532 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 06:08:20,533 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755109415] [2020-08-19 06:08:20,533 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 06:08:20,533 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:20,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 06:08:20,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-19 06:08:20,534 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 11 states. [2020-08-19 06:08:24,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:24,955 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-19 06:08:24,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 06:08:24,955 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2020-08-19 06:08:24,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:24,956 INFO L225 Difference]: With dead ends: 32 [2020-08-19 06:08:24,957 INFO L226 Difference]: Without dead ends: 26 [2020-08-19 06:08:24,957 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=33, Invalid=148, Unknown=1, NotChecked=0, Total=182 [2020-08-19 06:08:24,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-19 06:08:24,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-19 06:08:24,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-19 06:08:24,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-19 06:08:24,962 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2020-08-19 06:08:24,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:24,963 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-19 06:08:24,963 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 06:08:24,963 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-19 06:08:24,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-19 06:08:24,964 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:24,964 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:24,964 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 06:08:24,965 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:24,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:24,965 INFO L82 PathProgramCache]: Analyzing trace with hash -480947253, now seen corresponding path program 4 times [2020-08-19 06:08:24,965 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:24,966 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1720574307] [2020-08-19 06:08:24,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:24,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:25,348 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:25,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:25,356 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:08:25,357 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1720574307] [2020-08-19 06:08:25,357 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:25,357 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 06:08:25,358 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774935441] [2020-08-19 06:08:25,358 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 06:08:25,359 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:25,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 06:08:25,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-19 06:08:25,359 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 13 states. [2020-08-19 06:08:25,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:25,572 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-19 06:08:25,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 06:08:25,573 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2020-08-19 06:08:25,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:25,574 INFO L225 Difference]: With dead ends: 35 [2020-08-19 06:08:25,574 INFO L226 Difference]: Without dead ends: 29 [2020-08-19 06:08:25,575 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 [2020-08-19 06:08:25,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-19 06:08:25,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-19 06:08:25,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 06:08:25,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-19 06:08:25,580 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2020-08-19 06:08:25,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:25,581 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-19 06:08:25,581 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 06:08:25,581 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-19 06:08:25,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 06:08:25,582 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:25,584 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:25,584 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 06:08:25,584 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:25,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:25,585 INFO L82 PathProgramCache]: Analyzing trace with hash 1422910986, now seen corresponding path program 5 times [2020-08-19 06:08:25,585 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:25,585 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1648992653] [2020-08-19 06:08:25,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:25,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:26,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:26,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:26,018 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:08:26,018 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1648992653] [2020-08-19 06:08:26,019 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:26,019 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 06:08:26,019 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128473057] [2020-08-19 06:08:26,020 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 06:08:26,020 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:26,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 06:08:26,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-19 06:08:26,021 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2020-08-19 06:08:28,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:28,325 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-19 06:08:28,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 06:08:28,326 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2020-08-19 06:08:28,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:28,327 INFO L225 Difference]: With dead ends: 38 [2020-08-19 06:08:28,327 INFO L226 Difference]: Without dead ends: 32 [2020-08-19 06:08:28,327 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=41, Invalid=265, Unknown=0, NotChecked=0, Total=306 [2020-08-19 06:08:28,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-19 06:08:28,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-19 06:08:28,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-19 06:08:28,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-19 06:08:28,332 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2020-08-19 06:08:28,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:28,332 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-19 06:08:28,332 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 06:08:28,333 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-19 06:08:28,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-19 06:08:28,333 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:28,334 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:28,334 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 06:08:28,334 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:28,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:28,335 INFO L82 PathProgramCache]: Analyzing trace with hash -74401941, now seen corresponding path program 6 times [2020-08-19 06:08:28,335 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:28,335 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [512634049] [2020-08-19 06:08:28,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:28,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:28,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:28,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:28,841 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:08:28,841 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [512634049] [2020-08-19 06:08:28,842 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:28,842 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 06:08:28,842 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [196167960] [2020-08-19 06:08:28,842 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 06:08:28,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:28,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 06:08:28,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-19 06:08:28,843 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 17 states. [2020-08-19 06:08:35,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:35,490 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-19 06:08:35,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 06:08:35,491 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2020-08-19 06:08:35,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:35,491 INFO L225 Difference]: With dead ends: 41 [2020-08-19 06:08:35,492 INFO L226 Difference]: Without dead ends: 35 [2020-08-19 06:08:35,492 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=45, Invalid=334, Unknown=1, NotChecked=0, Total=380 [2020-08-19 06:08:35,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-19 06:08:35,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-19 06:08:35,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 06:08:35,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-19 06:08:35,497 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2020-08-19 06:08:35,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:35,497 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-19 06:08:35,497 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 06:08:35,497 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-19 06:08:35,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 06:08:35,498 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:35,498 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:35,499 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 06:08:35,499 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:35,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:35,499 INFO L82 PathProgramCache]: Analyzing trace with hash 1006526058, now seen corresponding path program 7 times [2020-08-19 06:08:35,499 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:35,499 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1258834429] [2020-08-19 06:08:35,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:35,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:36,022 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:36,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:36,028 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:08:36,029 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1258834429] [2020-08-19 06:08:36,029 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:36,029 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 06:08:36,029 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506308293] [2020-08-19 06:08:36,030 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 06:08:36,030 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:36,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 06:08:36,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-19 06:08:36,031 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 19 states. [2020-08-19 06:08:59,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:59,317 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-19 06:08:59,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 06:08:59,317 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 34 [2020-08-19 06:08:59,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:59,318 INFO L225 Difference]: With dead ends: 44 [2020-08-19 06:08:59,318 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 06:08:59,319 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=49, Invalid=408, Unknown=5, NotChecked=0, Total=462 [2020-08-19 06:08:59,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 06:08:59,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-19 06:08:59,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-19 06:08:59,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-19 06:08:59,327 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2020-08-19 06:08:59,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:59,328 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-19 06:08:59,328 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 06:08:59,328 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-19 06:08:59,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-19 06:08:59,330 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:59,330 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:59,330 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 06:08:59,330 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:59,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:59,331 INFO L82 PathProgramCache]: Analyzing trace with hash -732241141, now seen corresponding path program 8 times [2020-08-19 06:08:59,331 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:59,331 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [116576285] [2020-08-19 06:08:59,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:59,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:59,948 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:59,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:59,963 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:08:59,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [116576285] [2020-08-19 06:08:59,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:59,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 06:08:59,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1996394125] [2020-08-19 06:08:59,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 06:08:59,965 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:59,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 06:08:59,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-19 06:08:59,965 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 21 states. [2020-08-19 06:09:00,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:09:00,375 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-19 06:09:00,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 06:09:00,376 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 37 [2020-08-19 06:09:00,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:09:00,377 INFO L225 Difference]: With dead ends: 47 [2020-08-19 06:09:00,377 INFO L226 Difference]: Without dead ends: 41 [2020-08-19 06:09:00,378 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 [2020-08-19 06:09:00,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-19 06:09:00,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-19 06:09:00,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 06:09:00,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-19 06:09:00,382 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2020-08-19 06:09:00,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:09:00,382 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-19 06:09:00,383 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 06:09:00,383 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-19 06:09:00,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-19 06:09:00,383 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:09:00,384 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:09:00,384 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 06:09:00,384 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:09:00,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:09:00,384 INFO L82 PathProgramCache]: Analyzing trace with hash 1254690506, now seen corresponding path program 9 times [2020-08-19 06:09:00,385 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:09:00,385 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1723089839] [2020-08-19 06:09:00,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:09:00,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:09:01,080 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:09:01,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:09:01,087 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:09:01,088 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1723089839] [2020-08-19 06:09:01,088 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:09:01,088 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 06:09:01,088 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822704141] [2020-08-19 06:09:01,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 06:09:01,089 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:09:01,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 06:09:01,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-19 06:09:01,089 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 23 states. [2020-08-19 06:09:16,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:09:16,183 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-19 06:09:16,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 06:09:16,184 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 40 [2020-08-19 06:09:16,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:09:16,185 INFO L225 Difference]: With dead ends: 50 [2020-08-19 06:09:16,185 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 06:09:16,185 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=57, Invalid=589, Unknown=4, NotChecked=0, Total=650 [2020-08-19 06:09:16,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 06:09:16,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-19 06:09:16,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-19 06:09:16,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-19 06:09:16,190 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2020-08-19 06:09:16,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:09:16,190 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-19 06:09:16,190 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 06:09:16,190 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-19 06:09:16,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-19 06:09:16,191 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:09:16,191 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:09:16,191 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 06:09:16,192 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:09:16,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:09:16,192 INFO L82 PathProgramCache]: Analyzing trace with hash 696112811, now seen corresponding path program 10 times [2020-08-19 06:09:16,192 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:09:16,192 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [515505855] [2020-08-19 06:09:16,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:09:16,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:09:16,968 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:09:16,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:09:16,977 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:09:16,977 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [515505855] [2020-08-19 06:09:16,977 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:09:16,978 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 06:09:16,978 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296724846] [2020-08-19 06:09:16,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 06:09:16,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:09:16,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 06:09:16,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-19 06:09:16,979 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 25 states. [2020-08-19 06:09:32,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:09:32,179 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-19 06:09:32,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 06:09:32,179 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 43 [2020-08-19 06:09:32,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:09:32,180 INFO L225 Difference]: With dead ends: 53 [2020-08-19 06:09:32,181 INFO L226 Difference]: Without dead ends: 47 [2020-08-19 06:09:32,182 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=61, Invalid=690, Unknown=5, NotChecked=0, Total=756 [2020-08-19 06:09:32,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-19 06:09:32,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-19 06:09:32,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-19 06:09:32,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-19 06:09:32,186 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 43 [2020-08-19 06:09:32,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:09:32,187 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-19 06:09:32,187 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 06:09:32,187 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-19 06:09:32,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-19 06:09:32,188 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:09:32,188 INFO L422 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:09:32,188 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 06:09:32,188 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:09:32,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:09:32,189 INFO L82 PathProgramCache]: Analyzing trace with hash -1188694230, now seen corresponding path program 11 times [2020-08-19 06:09:32,189 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:09:32,189 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1765280176] [2020-08-19 06:09:32,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:09:32,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:09:33,040 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:09:33,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:09:33,048 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:09:33,049 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1765280176] [2020-08-19 06:09:33,049 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:09:33,049 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-19 06:09:33,049 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [457415613] [2020-08-19 06:09:33,050 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-19 06:09:33,050 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:09:33,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-19 06:09:33,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-19 06:09:33,051 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 27 states.