/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 false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/afnp2014.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-eb0fd7c [2020-09-21 10:29:44,088 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-09-21 10:29:44,120 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-21 10:29:44,122 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-21 10:29:44,123 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-21 10:29:44,125 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-21 10:29:44,127 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-21 10:29:44,128 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-21 10:29:44,129 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-21 10:29:44,130 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-21 10:29:44,131 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-21 10:29:44,132 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-21 10:29:44,133 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-21 10:29:44,134 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-21 10:29:44,135 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-21 10:29:44,137 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-21 10:29:44,138 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-21 10:29:44,140 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-21 10:29:44,142 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-21 10:29:44,143 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-21 10:29:44,145 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-21 10:29:44,146 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-21 10:29:44,148 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-21 10:29:44,157 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-21 10:29:44,158 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-21 10:29:44,159 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-21 10:29:44,160 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 [2020-09-21 10:29:44,187 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-21 10:29:44,187 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-21 10:29:44,188 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-21 10:29:44,188 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-21 10:29:44,189 INFO L138 SettingsManager]: * Use SBE=true [2020-09-21 10:29:44,189 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-21 10:29:44,189 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-21 10:29:44,189 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-21 10:29:44,190 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-21 10:29:44,190 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-21 10:29:44,190 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-21 10:29:44,190 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-21 10:29:44,190 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-21 10:29:44,190 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-21 10:29:44,191 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-21 10:29:44,191 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-21 10:29:44,191 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-21 10:29:44,191 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-21 10:29:44,192 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-21 10:29:44,192 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-21 10:29:44,192 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-21 10:29:44,192 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 10:29:44,192 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-21 10:29:44,193 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-21 10:29:44,193 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-21 10:29:44,193 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-21 10:29:44,193 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-21 10:29:44,193 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-21 10:29:44,194 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-21 10:29:44,194 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 -> false [2020-09-21 10:29:44,700 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-21 10:29:44,719 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-21 10:29:44,724 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-21 10:29:44,725 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-21 10:29:44,726 INFO L275 PluginConnector]: CDTParser initialized [2020-09-21 10:29:44,727 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/afnp2014.i [2020-09-21 10:29:44,825 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5fd4322ad/b9987d9667db4aba8610eeee143657a2/FLAGf525f9cec [2020-09-21 10:29:45,355 INFO L306 CDTParser]: Found 1 translation units. [2020-09-21 10:29:45,356 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/afnp2014.i [2020-09-21 10:29:45,366 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5fd4322ad/b9987d9667db4aba8610eeee143657a2/FLAGf525f9cec [2020-09-21 10:29:45,715 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5fd4322ad/b9987d9667db4aba8610eeee143657a2 [2020-09-21 10:29:45,729 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-21 10:29:45,734 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-21 10:29:45,735 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-21 10:29:45,736 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-21 10:29:45,740 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-21 10:29:45,741 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:29:45" (1/1) ... [2020-09-21 10:29:45,745 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@a95ee96 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:45, skipping insertion in model container [2020-09-21 10:29:45,746 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:29:45" (1/1) ... [2020-09-21 10:29:45,755 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-21 10:29:45,781 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-21 10:29:45,978 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:29:45,983 INFO L203 MainTranslator]: Completed pre-run [2020-09-21 10:29:46,004 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:29:46,023 INFO L208 MainTranslator]: Completed translation [2020-09-21 10:29:46,024 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:46 WrapperNode [2020-09-21 10:29:46,024 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-21 10:29:46,025 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-21 10:29:46,025 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-21 10:29:46,025 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-21 10:29:46,043 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:46" (1/1) ... [2020-09-21 10:29:46,044 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:46" (1/1) ... [2020-09-21 10:29:46,050 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:46" (1/1) ... [2020-09-21 10:29:46,051 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:46" (1/1) ... [2020-09-21 10:29:46,055 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:46" (1/1) ... [2020-09-21 10:29:46,060 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:46" (1/1) ... [2020-09-21 10:29:46,061 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:46" (1/1) ... [2020-09-21 10:29:46,153 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-21 10:29:46,153 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-21 10:29:46,153 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-21 10:29:46,154 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-21 10:29:46,155 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:46" (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 [2020-09-21 10:29:46,234 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-21 10:29:46,234 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-21 10:29:46,234 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-09-21 10:29:46,234 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-21 10:29:46,235 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-21 10:29:46,235 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-21 10:29:46,235 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-09-21 10:29:46,235 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-09-21 10:29:46,235 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-21 10:29:46,236 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-21 10:29:46,236 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-21 10:29:46,236 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-21 10:29:46,236 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-21 10:29:46,443 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-21 10:29:46,444 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-09-21 10:29:46,448 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:29:46 BoogieIcfgContainer [2020-09-21 10:29:46,449 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-21 10:29:46,450 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-21 10:29:46,450 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-21 10:29:46,456 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-21 10:29:46,457 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.09 10:29:45" (1/3) ... [2020-09-21 10:29:46,458 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a417d7e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:29:46, skipping insertion in model container [2020-09-21 10:29:46,458 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:46" (2/3) ... [2020-09-21 10:29:46,458 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a417d7e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:29:46, skipping insertion in model container [2020-09-21 10:29:46,459 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:29:46" (3/3) ... [2020-09-21 10:29:46,461 INFO L109 eAbstractionObserver]: Analyzing ICFG afnp2014.i [2020-09-21 10:29:46,472 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-21 10:29:46,481 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-21 10:29:46,502 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-21 10:29:46,532 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-21 10:29:46,533 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-21 10:29:46,533 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-21 10:29:46,533 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-21 10:29:46,533 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-21 10:29:46,533 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-21 10:29:46,533 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-21 10:29:46,534 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-21 10:29:46,555 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-09-21 10:29:46,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-09-21 10:29:46,562 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:46,563 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:46,564 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:46,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:46,571 INFO L82 PathProgramCache]: Analyzing trace with hash -1915647303, now seen corresponding path program 1 times [2020-09-21 10:29:46,580 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:46,581 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [559507343] [2020-09-21 10:29:46,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:46,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:46,696 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:46,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:46,703 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:46,704 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [559507343] [2020-09-21 10:29:46,706 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:29:46,707 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-09-21 10:29:46,708 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718009581] [2020-09-21 10:29:46,714 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-09-21 10:29:46,715 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:46,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-09-21 10:29:46,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-09-21 10:29:46,733 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2020-09-21 10:29:46,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:46,758 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2020-09-21 10:29:46,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-09-21 10:29:46,759 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-09-21 10:29:46,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:46,768 INFO L225 Difference]: With dead ends: 32 [2020-09-21 10:29:46,768 INFO L226 Difference]: Without dead ends: 13 [2020-09-21 10:29:46,772 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 [2020-09-21 10:29:46,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-09-21 10:29:46,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-09-21 10:29:46,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-09-21 10:29:46,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-09-21 10:29:46,811 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-09-21 10:29:46,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:46,811 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-09-21 10:29:46,811 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-09-21 10:29:46,812 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-09-21 10:29:46,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-09-21 10:29:46,812 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:46,813 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:46,813 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-21 10:29:46,813 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:46,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:46,814 INFO L82 PathProgramCache]: Analyzing trace with hash 2084433522, now seen corresponding path program 1 times [2020-09-21 10:29:46,814 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:46,814 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1741957199] [2020-09-21 10:29:46,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:46,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:46,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:46,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:46,947 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:46,948 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1741957199] [2020-09-21 10:29:46,948 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:29:46,949 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-21 10:29:46,949 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620481010] [2020-09-21 10:29:46,951 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 10:29:46,952 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:46,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 10:29:46,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:29:46,954 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 5 states. [2020-09-21 10:29:47,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:47,052 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2020-09-21 10:29:47,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 10:29:47,053 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-09-21 10:29:47,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:47,059 INFO L225 Difference]: With dead ends: 21 [2020-09-21 10:29:47,059 INFO L226 Difference]: Without dead ends: 16 [2020-09-21 10:29:47,061 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:29:47,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-09-21 10:29:47,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-09-21 10:29:47,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-09-21 10:29:47,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-09-21 10:29:47,067 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 12 [2020-09-21 10:29:47,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:47,067 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-09-21 10:29:47,067 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 10:29:47,068 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-09-21 10:29:47,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-09-21 10:29:47,069 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:47,069 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:47,069 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-21 10:29:47,069 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:47,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:47,070 INFO L82 PathProgramCache]: Analyzing trace with hash 249504553, now seen corresponding path program 1 times [2020-09-21 10:29:47,070 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:47,071 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1279836778] [2020-09-21 10:29:47,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:47,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:47,209 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:47,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:47,214 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:47,215 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1279836778] [2020-09-21 10:29:47,215 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:47,215 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-09-21 10:29:47,216 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621750207] [2020-09-21 10:29:47,216 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-21 10:29:47,217 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:47,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-21 10:29:47,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:29:47,218 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 6 states. [2020-09-21 10:29:47,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:47,295 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-09-21 10:29:47,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-21 10:29:47,296 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-09-21 10:29:47,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:47,297 INFO L225 Difference]: With dead ends: 24 [2020-09-21 10:29:47,298 INFO L226 Difference]: Without dead ends: 19 [2020-09-21 10:29:47,298 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-09-21 10:29:47,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-09-21 10:29:47,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-09-21 10:29:47,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-09-21 10:29:47,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2020-09-21 10:29:47,304 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 15 [2020-09-21 10:29:47,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:47,305 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2020-09-21 10:29:47,305 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-21 10:29:47,305 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2020-09-21 10:29:47,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-09-21 10:29:47,306 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:47,306 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:47,307 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-21 10:29:47,307 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:47,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:47,308 INFO L82 PathProgramCache]: Analyzing trace with hash -2070634734, now seen corresponding path program 2 times [2020-09-21 10:29:47,308 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:47,308 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1919868336] [2020-09-21 10:29:47,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:47,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:47,404 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:47,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:47,409 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:47,409 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1919868336] [2020-09-21 10:29:47,410 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:47,410 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-21 10:29:47,410 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490578451] [2020-09-21 10:29:47,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-21 10:29:47,411 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:47,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-21 10:29:47,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-09-21 10:29:47,412 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand 7 states. [2020-09-21 10:29:47,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:47,483 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2020-09-21 10:29:47,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-21 10:29:47,484 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-09-21 10:29:47,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:47,485 INFO L225 Difference]: With dead ends: 27 [2020-09-21 10:29:47,485 INFO L226 Difference]: Without dead ends: 22 [2020-09-21 10:29:47,486 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:29:47,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-09-21 10:29:47,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-09-21 10:29:47,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-09-21 10:29:47,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-09-21 10:29:47,492 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 18 [2020-09-21 10:29:47,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:47,492 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-09-21 10:29:47,492 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-21 10:29:47,493 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-09-21 10:29:47,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-09-21 10:29:47,494 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:47,494 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:47,494 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-21 10:29:47,494 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:47,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:47,495 INFO L82 PathProgramCache]: Analyzing trace with hash 1863528073, now seen corresponding path program 3 times [2020-09-21 10:29:47,495 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:47,495 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1365246344] [2020-09-21 10:29:47,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:47,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:47,614 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:47,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:47,619 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:47,619 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1365246344] [2020-09-21 10:29:47,620 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:47,620 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-21 10:29:47,620 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [597362295] [2020-09-21 10:29:47,621 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-21 10:29:47,621 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:47,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-21 10:29:47,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-09-21 10:29:47,622 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 8 states. [2020-09-21 10:29:47,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:47,704 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-09-21 10:29:47,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-21 10:29:47,706 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-09-21 10:29:47,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:47,707 INFO L225 Difference]: With dead ends: 30 [2020-09-21 10:29:47,707 INFO L226 Difference]: Without dead ends: 25 [2020-09-21 10:29:47,708 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:29:47,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-09-21 10:29:47,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-09-21 10:29:47,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-09-21 10:29:47,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2020-09-21 10:29:47,715 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 21 [2020-09-21 10:29:47,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:47,715 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2020-09-21 10:29:47,715 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-21 10:29:47,716 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2020-09-21 10:29:47,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-09-21 10:29:47,716 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:47,717 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:47,717 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-21 10:29:47,717 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:47,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:47,718 INFO L82 PathProgramCache]: Analyzing trace with hash -854829134, now seen corresponding path program 4 times [2020-09-21 10:29:47,718 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:47,719 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [678177453] [2020-09-21 10:29:47,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:47,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:47,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:47,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:47,864 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:47,865 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [678177453] [2020-09-21 10:29:47,865 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:47,865 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-21 10:29:47,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796864110] [2020-09-21 10:29:47,866 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-21 10:29:47,866 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:47,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-21 10:29:47,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-09-21 10:29:47,867 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand 9 states. [2020-09-21 10:29:48,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:48,006 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2020-09-21 10:29:48,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-21 10:29:48,006 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2020-09-21 10:29:48,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:48,008 INFO L225 Difference]: With dead ends: 33 [2020-09-21 10:29:48,008 INFO L226 Difference]: Without dead ends: 28 [2020-09-21 10:29:48,008 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:29:48,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-09-21 10:29:48,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-09-21 10:29:48,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-09-21 10:29:48,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2020-09-21 10:29:48,015 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 24 [2020-09-21 10:29:48,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:48,015 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2020-09-21 10:29:48,016 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-21 10:29:48,016 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2020-09-21 10:29:48,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-09-21 10:29:48,017 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:48,017 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:48,017 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-21 10:29:48,018 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:48,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:48,018 INFO L82 PathProgramCache]: Analyzing trace with hash -1826016791, now seen corresponding path program 5 times [2020-09-21 10:29:48,018 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:48,019 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1818230739] [2020-09-21 10:29:48,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:48,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:48,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:48,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:48,149 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:48,150 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1818230739] [2020-09-21 10:29:48,150 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:48,150 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-21 10:29:48,151 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955094371] [2020-09-21 10:29:48,151 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-21 10:29:48,152 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:48,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-21 10:29:48,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:29:48,152 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand 10 states. [2020-09-21 10:29:48,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:48,264 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2020-09-21 10:29:48,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-21 10:29:48,265 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-09-21 10:29:48,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:48,266 INFO L225 Difference]: With dead ends: 36 [2020-09-21 10:29:48,266 INFO L226 Difference]: Without dead ends: 31 [2020-09-21 10:29:48,267 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2020-09-21 10:29:48,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-09-21 10:29:48,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-09-21 10:29:48,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-09-21 10:29:48,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2020-09-21 10:29:48,274 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 27 [2020-09-21 10:29:48,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:48,274 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2020-09-21 10:29:48,274 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-21 10:29:48,274 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2020-09-21 10:29:48,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-09-21 10:29:48,275 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:48,275 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:48,276 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-21 10:29:48,276 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:48,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:48,276 INFO L82 PathProgramCache]: Analyzing trace with hash 717166674, now seen corresponding path program 6 times [2020-09-21 10:29:48,277 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:48,277 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [849287544] [2020-09-21 10:29:48,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:48,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:48,429 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:48,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:48,434 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:48,434 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [849287544] [2020-09-21 10:29:48,435 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:48,435 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-09-21 10:29:48,435 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553736011] [2020-09-21 10:29:48,436 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-09-21 10:29:48,436 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:48,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-09-21 10:29:48,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-09-21 10:29:48,437 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand 11 states. [2020-09-21 10:29:48,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:48,566 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2020-09-21 10:29:48,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-09-21 10:29:48,567 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-09-21 10:29:48,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:48,568 INFO L225 Difference]: With dead ends: 39 [2020-09-21 10:29:48,568 INFO L226 Difference]: Without dead ends: 34 [2020-09-21 10:29:48,569 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2020-09-21 10:29:48,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-09-21 10:29:48,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-09-21 10:29:48,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-09-21 10:29:48,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-09-21 10:29:48,576 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 30 [2020-09-21 10:29:48,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:48,576 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-09-21 10:29:48,576 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-09-21 10:29:48,576 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-09-21 10:29:48,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-09-21 10:29:48,577 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:48,578 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:48,578 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-21 10:29:48,578 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:48,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:48,579 INFO L82 PathProgramCache]: Analyzing trace with hash 1472671049, now seen corresponding path program 7 times [2020-09-21 10:29:48,579 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:48,579 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [767195888] [2020-09-21 10:29:48,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:48,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:48,739 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:48,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:48,746 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:48,747 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [767195888] [2020-09-21 10:29:48,748 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:48,748 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-09-21 10:29:48,749 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776054811] [2020-09-21 10:29:48,749 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-21 10:29:48,750 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:48,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-21 10:29:48,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2020-09-21 10:29:48,751 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 12 states. [2020-09-21 10:29:48,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:48,912 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-09-21 10:29:48,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-21 10:29:48,912 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 33 [2020-09-21 10:29:48,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:48,914 INFO L225 Difference]: With dead ends: 42 [2020-09-21 10:29:48,914 INFO L226 Difference]: Without dead ends: 37 [2020-09-21 10:29:48,915 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2020-09-21 10:29:48,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-09-21 10:29:48,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-09-21 10:29:48,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-09-21 10:29:48,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2020-09-21 10:29:48,922 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 33 [2020-09-21 10:29:48,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:48,923 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2020-09-21 10:29:48,923 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-21 10:29:48,923 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2020-09-21 10:29:48,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-09-21 10:29:48,924 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:48,925 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:48,925 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-21 10:29:48,925 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:48,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:48,926 INFO L82 PathProgramCache]: Analyzing trace with hash -1220091662, now seen corresponding path program 8 times [2020-09-21 10:29:48,926 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:48,927 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [227660373] [2020-09-21 10:29:48,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:48,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:49,124 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:49,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:49,130 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:49,130 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [227660373] [2020-09-21 10:29:49,131 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:49,131 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-09-21 10:29:49,131 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685651061] [2020-09-21 10:29:49,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-21 10:29:49,132 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:49,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-21 10:29:49,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-09-21 10:29:49,133 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand 13 states. [2020-09-21 10:29:49,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:49,317 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2020-09-21 10:29:49,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-09-21 10:29:49,318 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-09-21 10:29:49,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:49,319 INFO L225 Difference]: With dead ends: 45 [2020-09-21 10:29:49,319 INFO L226 Difference]: Without dead ends: 40 [2020-09-21 10:29:49,320 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2020-09-21 10:29:49,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-09-21 10:29:49,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-09-21 10:29:49,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-09-21 10:29:49,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 50 transitions. [2020-09-21 10:29:49,326 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 50 transitions. Word has length 36 [2020-09-21 10:29:49,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:49,327 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 50 transitions. [2020-09-21 10:29:49,327 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-21 10:29:49,327 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 50 transitions. [2020-09-21 10:29:49,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-09-21 10:29:49,328 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:49,328 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:49,329 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-09-21 10:29:49,329 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:49,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:49,329 INFO L82 PathProgramCache]: Analyzing trace with hash 85139625, now seen corresponding path program 9 times [2020-09-21 10:29:49,330 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:49,330 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [538094997] [2020-09-21 10:29:49,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:49,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:49,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:49,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:49,538 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:49,539 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [538094997] [2020-09-21 10:29:49,539 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:49,539 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-09-21 10:29:49,539 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1683726219] [2020-09-21 10:29:49,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-09-21 10:29:49,542 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:49,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-09-21 10:29:49,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2020-09-21 10:29:49,543 INFO L87 Difference]: Start difference. First operand 40 states and 50 transitions. Second operand 14 states. [2020-09-21 10:29:49,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:49,773 INFO L93 Difference]: Finished difference Result 48 states and 59 transitions. [2020-09-21 10:29:49,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-09-21 10:29:49,774 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2020-09-21 10:29:49,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:49,775 INFO L225 Difference]: With dead ends: 48 [2020-09-21 10:29:49,775 INFO L226 Difference]: Without dead ends: 43 [2020-09-21 10:29:49,776 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2020-09-21 10:29:49,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-09-21 10:29:49,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-09-21 10:29:49,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-09-21 10:29:49,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 54 transitions. [2020-09-21 10:29:49,788 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 54 transitions. Word has length 39 [2020-09-21 10:29:49,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:49,788 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 54 transitions. [2020-09-21 10:29:49,789 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-09-21 10:29:49,789 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 54 transitions. [2020-09-21 10:29:49,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-09-21 10:29:49,790 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:49,791 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:49,791 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-09-21 10:29:49,791 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:49,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:49,791 INFO L82 PathProgramCache]: Analyzing trace with hash 1891479954, now seen corresponding path program 10 times [2020-09-21 10:29:49,792 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:49,792 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [968423553] [2020-09-21 10:29:49,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:49,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:50,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:50,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:50,036 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:50,037 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [968423553] [2020-09-21 10:29:50,037 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:50,037 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-09-21 10:29:50,037 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534552608] [2020-09-21 10:29:50,038 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-09-21 10:29:50,038 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:50,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-09-21 10:29:50,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-09-21 10:29:50,039 INFO L87 Difference]: Start difference. First operand 43 states and 54 transitions. Second operand 15 states. [2020-09-21 10:29:50,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:50,310 INFO L93 Difference]: Finished difference Result 51 states and 63 transitions. [2020-09-21 10:29:50,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-09-21 10:29:50,311 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 42 [2020-09-21 10:29:50,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:50,312 INFO L225 Difference]: With dead ends: 51 [2020-09-21 10:29:50,312 INFO L226 Difference]: Without dead ends: 46 [2020-09-21 10:29:50,313 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2020-09-21 10:29:50,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-09-21 10:29:50,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-09-21 10:29:50,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-09-21 10:29:50,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 58 transitions. [2020-09-21 10:29:50,324 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 58 transitions. Word has length 42 [2020-09-21 10:29:50,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:50,324 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 58 transitions. [2020-09-21 10:29:50,324 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-09-21 10:29:50,324 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 58 transitions. [2020-09-21 10:29:50,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-09-21 10:29:50,327 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:50,327 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:50,327 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-09-21 10:29:50,328 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:50,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:50,328 INFO L82 PathProgramCache]: Analyzing trace with hash -1363997687, now seen corresponding path program 11 times [2020-09-21 10:29:50,328 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:50,328 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [867844121] [2020-09-21 10:29:50,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:50,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:50,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:50,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:50,576 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:50,576 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [867844121] [2020-09-21 10:29:50,576 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:50,576 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-09-21 10:29:50,577 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544748653] [2020-09-21 10:29:50,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-09-21 10:29:50,577 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:50,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-09-21 10:29:50,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2020-09-21 10:29:50,578 INFO L87 Difference]: Start difference. First operand 46 states and 58 transitions. Second operand 16 states. [2020-09-21 10:29:50,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:50,923 INFO L93 Difference]: Finished difference Result 54 states and 67 transitions. [2020-09-21 10:29:50,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-09-21 10:29:50,923 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 45 [2020-09-21 10:29:50,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:50,924 INFO L225 Difference]: With dead ends: 54 [2020-09-21 10:29:50,924 INFO L226 Difference]: Without dead ends: 49 [2020-09-21 10:29:50,925 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=239, Unknown=0, NotChecked=0, Total=272 [2020-09-21 10:29:50,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-09-21 10:29:50,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-09-21 10:29:50,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-09-21 10:29:50,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 62 transitions. [2020-09-21 10:29:50,933 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 62 transitions. Word has length 45 [2020-09-21 10:29:50,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:50,934 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 62 transitions. [2020-09-21 10:29:50,934 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-09-21 10:29:50,934 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 62 transitions. [2020-09-21 10:29:50,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-09-21 10:29:50,935 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:50,935 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:50,935 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-09-21 10:29:50,935 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:50,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:50,936 INFO L82 PathProgramCache]: Analyzing trace with hash -641889742, now seen corresponding path program 12 times [2020-09-21 10:29:50,936 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:50,936 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [329324339] [2020-09-21 10:29:50,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:50,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:51,226 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:51,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:51,246 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:51,247 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [329324339] [2020-09-21 10:29:51,247 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:51,248 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-09-21 10:29:51,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727218076] [2020-09-21 10:29:51,250 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-09-21 10:29:51,250 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:51,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-09-21 10:29:51,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-09-21 10:29:51,251 INFO L87 Difference]: Start difference. First operand 49 states and 62 transitions. Second operand 17 states. [2020-09-21 10:29:51,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:51,570 INFO L93 Difference]: Finished difference Result 57 states and 71 transitions. [2020-09-21 10:29:51,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-09-21 10:29:51,570 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-09-21 10:29:51,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:51,571 INFO L225 Difference]: With dead ends: 57 [2020-09-21 10:29:51,572 INFO L226 Difference]: Without dead ends: 52 [2020-09-21 10:29:51,572 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=271, Unknown=0, NotChecked=0, Total=306 [2020-09-21 10:29:51,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-09-21 10:29:51,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-09-21 10:29:51,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-09-21 10:29:51,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 66 transitions. [2020-09-21 10:29:51,581 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 66 transitions. Word has length 48 [2020-09-21 10:29:51,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:51,581 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 66 transitions. [2020-09-21 10:29:51,581 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-09-21 10:29:51,582 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 66 transitions. [2020-09-21 10:29:51,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-09-21 10:29:51,585 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:51,585 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:51,585 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-09-21 10:29:51,585 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:51,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:51,586 INFO L82 PathProgramCache]: Analyzing trace with hash -1815285911, now seen corresponding path program 13 times [2020-09-21 10:29:51,586 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:51,586 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [818343027] [2020-09-21 10:29:51,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:51,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:51,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:51,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:51,881 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 273 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:51,882 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [818343027] [2020-09-21 10:29:51,882 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:51,882 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-09-21 10:29:51,882 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78098032] [2020-09-21 10:29:51,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-09-21 10:29:51,883 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:51,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-09-21 10:29:51,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2020-09-21 10:29:51,884 INFO L87 Difference]: Start difference. First operand 52 states and 66 transitions. Second operand 18 states. [2020-09-21 10:29:52,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:52,224 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2020-09-21 10:29:52,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-09-21 10:29:52,225 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 51 [2020-09-21 10:29:52,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:52,226 INFO L225 Difference]: With dead ends: 60 [2020-09-21 10:29:52,226 INFO L226 Difference]: Without dead ends: 55 [2020-09-21 10:29:52,230 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=305, Unknown=0, NotChecked=0, Total=342 [2020-09-21 10:29:52,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-09-21 10:29:52,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-09-21 10:29:52,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-09-21 10:29:52,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 70 transitions. [2020-09-21 10:29:52,241 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 70 transitions. Word has length 51 [2020-09-21 10:29:52,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:52,242 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 70 transitions. [2020-09-21 10:29:52,242 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-09-21 10:29:52,242 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 70 transitions. [2020-09-21 10:29:52,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-09-21 10:29:52,245 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:52,245 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:52,245 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-09-21 10:29:52,246 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:52,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:52,246 INFO L82 PathProgramCache]: Analyzing trace with hash -1721734446, now seen corresponding path program 14 times [2020-09-21 10:29:52,246 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:52,247 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [252869710] [2020-09-21 10:29:52,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:52,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:52,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:52,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:52,619 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 315 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:52,620 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [252869710] [2020-09-21 10:29:52,623 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:52,623 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-09-21 10:29:52,624 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966482612] [2020-09-21 10:29:52,624 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-09-21 10:29:52,625 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:52,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-09-21 10:29:52,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-09-21 10:29:52,626 INFO L87 Difference]: Start difference. First operand 55 states and 70 transitions. Second operand 19 states. [2020-09-21 10:29:53,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:53,050 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-09-21 10:29:53,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-09-21 10:29:53,051 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 54 [2020-09-21 10:29:53,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:53,052 INFO L225 Difference]: With dead ends: 63 [2020-09-21 10:29:53,052 INFO L226 Difference]: Without dead ends: 58 [2020-09-21 10:29:53,053 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=341, Unknown=0, NotChecked=0, Total=380 [2020-09-21 10:29:53,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-09-21 10:29:53,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-09-21 10:29:53,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-09-21 10:29:53,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 74 transitions. [2020-09-21 10:29:53,060 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 74 transitions. Word has length 54 [2020-09-21 10:29:53,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:53,061 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 74 transitions. [2020-09-21 10:29:53,061 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-09-21 10:29:53,061 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 74 transitions. [2020-09-21 10:29:53,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-09-21 10:29:53,062 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:53,062 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:53,062 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-09-21 10:29:53,062 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:53,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:53,063 INFO L82 PathProgramCache]: Analyzing trace with hash 2131151561, now seen corresponding path program 15 times [2020-09-21 10:29:53,063 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:53,063 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1363120541] [2020-09-21 10:29:53,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:53,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:53,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:53,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:53,403 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:53,403 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1363120541] [2020-09-21 10:29:53,404 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:53,404 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-09-21 10:29:53,404 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1212103229] [2020-09-21 10:29:53,404 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-09-21 10:29:53,404 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:53,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-09-21 10:29:53,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2020-09-21 10:29:53,405 INFO L87 Difference]: Start difference. First operand 58 states and 74 transitions. Second operand 20 states. [2020-09-21 10:29:53,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:53,882 INFO L93 Difference]: Finished difference Result 66 states and 83 transitions. [2020-09-21 10:29:53,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-09-21 10:29:53,883 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 57 [2020-09-21 10:29:53,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:53,884 INFO L225 Difference]: With dead ends: 66 [2020-09-21 10:29:53,884 INFO L226 Difference]: Without dead ends: 61 [2020-09-21 10:29:53,885 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=379, Unknown=0, NotChecked=0, Total=420 [2020-09-21 10:29:53,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-09-21 10:29:53,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-09-21 10:29:53,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-09-21 10:29:53,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 78 transitions. [2020-09-21 10:29:53,899 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 78 transitions. Word has length 57 [2020-09-21 10:29:53,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:53,899 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 78 transitions. [2020-09-21 10:29:53,899 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-09-21 10:29:53,899 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 78 transitions. [2020-09-21 10:29:53,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-09-21 10:29:53,900 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:53,900 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:53,900 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-09-21 10:29:53,900 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:53,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:53,901 INFO L82 PathProgramCache]: Analyzing trace with hash 457200498, now seen corresponding path program 16 times [2020-09-21 10:29:53,901 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:53,901 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1229276382] [2020-09-21 10:29:53,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:53,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:54,253 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:54,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:54,262 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:54,262 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1229276382] [2020-09-21 10:29:54,263 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:54,263 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-09-21 10:29:54,263 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [94096906] [2020-09-21 10:29:54,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-09-21 10:29:54,264 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:54,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-09-21 10:29:54,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-09-21 10:29:54,265 INFO L87 Difference]: Start difference. First operand 61 states and 78 transitions. Second operand 21 states. [2020-09-21 10:29:54,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:54,725 INFO L93 Difference]: Finished difference Result 69 states and 87 transitions. [2020-09-21 10:29:54,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-09-21 10:29:54,729 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 60 [2020-09-21 10:29:54,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:54,730 INFO L225 Difference]: With dead ends: 69 [2020-09-21 10:29:54,730 INFO L226 Difference]: Without dead ends: 64 [2020-09-21 10:29:54,730 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=43, Invalid=419, Unknown=0, NotChecked=0, Total=462 [2020-09-21 10:29:54,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-09-21 10:29:54,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-09-21 10:29:54,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-09-21 10:29:54,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 82 transitions. [2020-09-21 10:29:54,736 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 82 transitions. Word has length 60 [2020-09-21 10:29:54,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:54,737 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 82 transitions. [2020-09-21 10:29:54,737 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-09-21 10:29:54,737 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 82 transitions. [2020-09-21 10:29:54,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-09-21 10:29:54,738 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:54,738 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:54,738 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-09-21 10:29:54,738 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:54,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:54,739 INFO L82 PathProgramCache]: Analyzing trace with hash 646356521, now seen corresponding path program 17 times [2020-09-21 10:29:54,739 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:54,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1224350733] [2020-09-21 10:29:54,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:54,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:55,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:55,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:55,154 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 459 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:55,154 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1224350733] [2020-09-21 10:29:55,154 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:55,154 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-09-21 10:29:55,155 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559953046] [2020-09-21 10:29:55,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-09-21 10:29:55,155 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:55,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-09-21 10:29:55,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2020-09-21 10:29:55,156 INFO L87 Difference]: Start difference. First operand 64 states and 82 transitions. Second operand 22 states. [2020-09-21 10:29:55,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:55,784 INFO L93 Difference]: Finished difference Result 72 states and 91 transitions. [2020-09-21 10:29:55,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-09-21 10:29:55,784 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 63 [2020-09-21 10:29:55,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:55,786 INFO L225 Difference]: With dead ends: 72 [2020-09-21 10:29:55,786 INFO L226 Difference]: Without dead ends: 67 [2020-09-21 10:29:55,787 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=461, Unknown=0, NotChecked=0, Total=506 [2020-09-21 10:29:55,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-09-21 10:29:55,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-09-21 10:29:55,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-09-21 10:29:55,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 86 transitions. [2020-09-21 10:29:55,794 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 86 transitions. Word has length 63 [2020-09-21 10:29:55,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:55,795 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 86 transitions. [2020-09-21 10:29:55,795 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-09-21 10:29:55,795 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 86 transitions. [2020-09-21 10:29:55,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-09-21 10:29:55,796 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:55,796 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:55,796 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-09-21 10:29:55,796 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:55,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:55,797 INFO L82 PathProgramCache]: Analyzing trace with hash 796345362, now seen corresponding path program 18 times [2020-09-21 10:29:55,797 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:55,797 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2066947693] [2020-09-21 10:29:55,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:55,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:56,252 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:56,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:56,262 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 0 proven. 513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:56,262 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2066947693] [2020-09-21 10:29:56,262 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:56,263 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-09-21 10:29:56,263 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621752629] [2020-09-21 10:29:56,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-09-21 10:29:56,264 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:56,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-09-21 10:29:56,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-09-21 10:29:56,264 INFO L87 Difference]: Start difference. First operand 67 states and 86 transitions. Second operand 23 states. [2020-09-21 10:29:56,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:56,942 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2020-09-21 10:29:56,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-09-21 10:29:56,942 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 66 [2020-09-21 10:29:56,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:56,944 INFO L225 Difference]: With dead ends: 75 [2020-09-21 10:29:56,944 INFO L226 Difference]: Without dead ends: 70 [2020-09-21 10:29:56,944 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=47, Invalid=505, Unknown=0, NotChecked=0, Total=552 [2020-09-21 10:29:56,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-09-21 10:29:56,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-09-21 10:29:56,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-09-21 10:29:56,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 90 transitions. [2020-09-21 10:29:56,951 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 90 transitions. Word has length 66 [2020-09-21 10:29:56,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:56,952 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 90 transitions. [2020-09-21 10:29:56,952 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-09-21 10:29:56,952 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 90 transitions. [2020-09-21 10:29:56,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-09-21 10:29:56,953 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:56,953 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:56,953 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-09-21 10:29:56,953 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:56,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:56,954 INFO L82 PathProgramCache]: Analyzing trace with hash -1947047543, now seen corresponding path program 19 times [2020-09-21 10:29:56,954 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:56,954 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1872140719] [2020-09-21 10:29:56,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:56,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:57,405 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:57,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:57,414 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:57,415 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1872140719] [2020-09-21 10:29:57,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:57,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-09-21 10:29:57,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302854257] [2020-09-21 10:29:57,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-09-21 10:29:57,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:57,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-09-21 10:29:57,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2020-09-21 10:29:57,417 INFO L87 Difference]: Start difference. First operand 70 states and 90 transitions. Second operand 24 states. [2020-09-21 10:29:58,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:58,154 INFO L93 Difference]: Finished difference Result 78 states and 99 transitions. [2020-09-21 10:29:58,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-09-21 10:29:58,155 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 69 [2020-09-21 10:29:58,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:58,156 INFO L225 Difference]: With dead ends: 78 [2020-09-21 10:29:58,156 INFO L226 Difference]: Without dead ends: 73 [2020-09-21 10:29:58,157 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=49, Invalid=551, Unknown=0, NotChecked=0, Total=600 [2020-09-21 10:29:58,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-09-21 10:29:58,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2020-09-21 10:29:58,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-09-21 10:29:58,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 94 transitions. [2020-09-21 10:29:58,164 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 94 transitions. Word has length 69 [2020-09-21 10:29:58,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:58,165 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 94 transitions. [2020-09-21 10:29:58,165 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-09-21 10:29:58,165 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 94 transitions. [2020-09-21 10:29:58,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-09-21 10:29:58,165 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:58,166 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:58,166 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-09-21 10:29:58,166 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:58,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:58,166 INFO L82 PathProgramCache]: Analyzing trace with hash -1432404814, now seen corresponding path program 20 times [2020-09-21 10:29:58,166 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:58,167 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [120933127] [2020-09-21 10:29:58,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:58,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:58,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:58,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:58,642 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:58,643 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [120933127] [2020-09-21 10:29:58,643 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:58,643 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-09-21 10:29:58,644 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314780245] [2020-09-21 10:29:58,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-09-21 10:29:58,644 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:58,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-09-21 10:29:58,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-09-21 10:29:58,645 INFO L87 Difference]: Start difference. First operand 73 states and 94 transitions. Second operand 25 states. [2020-09-21 10:29:59,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:59,421 INFO L93 Difference]: Finished difference Result 81 states and 103 transitions. [2020-09-21 10:29:59,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-09-21 10:29:59,423 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 72 [2020-09-21 10:29:59,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:59,424 INFO L225 Difference]: With dead ends: 81 [2020-09-21 10:29:59,424 INFO L226 Difference]: Without dead ends: 76 [2020-09-21 10:29:59,425 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=51, Invalid=599, Unknown=0, NotChecked=0, Total=650 [2020-09-21 10:29:59,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-09-21 10:29:59,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2020-09-21 10:29:59,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-09-21 10:29:59,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 98 transitions. [2020-09-21 10:29:59,435 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 98 transitions. Word has length 72 [2020-09-21 10:29:59,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:59,435 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 98 transitions. [2020-09-21 10:29:59,435 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-09-21 10:29:59,435 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 98 transitions. [2020-09-21 10:29:59,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-09-21 10:29:59,438 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:59,438 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:59,438 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-09-21 10:29:59,438 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:59,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:59,439 INFO L82 PathProgramCache]: Analyzing trace with hash 1550855401, now seen corresponding path program 21 times [2020-09-21 10:29:59,439 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:59,443 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1179002438] [2020-09-21 10:29:59,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:59,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:59,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:59,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:59,961 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 0 proven. 693 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:59,967 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1179002438] [2020-09-21 10:29:59,967 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:59,967 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-09-21 10:29:59,971 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745516814] [2020-09-21 10:29:59,972 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-09-21 10:29:59,972 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:59,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-09-21 10:29:59,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2020-09-21 10:29:59,973 INFO L87 Difference]: Start difference. First operand 76 states and 98 transitions. Second operand 26 states. [2020-09-21 10:30:00,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:00,841 INFO L93 Difference]: Finished difference Result 84 states and 107 transitions. [2020-09-21 10:30:00,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-09-21 10:30:00,841 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 75 [2020-09-21 10:30:00,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:00,842 INFO L225 Difference]: With dead ends: 84 [2020-09-21 10:30:00,842 INFO L226 Difference]: Without dead ends: 79 [2020-09-21 10:30:00,843 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=53, Invalid=649, Unknown=0, NotChecked=0, Total=702 [2020-09-21 10:30:00,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-09-21 10:30:00,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2020-09-21 10:30:00,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-09-21 10:30:00,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 102 transitions. [2020-09-21 10:30:00,850 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 102 transitions. Word has length 75 [2020-09-21 10:30:00,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:00,850 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 102 transitions. [2020-09-21 10:30:00,850 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-09-21 10:30:00,851 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 102 transitions. [2020-09-21 10:30:00,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-09-21 10:30:00,851 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:00,851 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:00,852 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-09-21 10:30:00,852 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:00,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:00,852 INFO L82 PathProgramCache]: Analyzing trace with hash 97664338, now seen corresponding path program 22 times [2020-09-21 10:30:00,852 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:00,853 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1070314153] [2020-09-21 10:30:00,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:00,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:01,356 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:01,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:01,370 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 0 proven. 759 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:30:01,370 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1070314153] [2020-09-21 10:30:01,370 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:01,371 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-09-21 10:30:01,371 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1254629492] [2020-09-21 10:30:01,371 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-09-21 10:30:01,371 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:01,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-09-21 10:30:01,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-09-21 10:30:01,372 INFO L87 Difference]: Start difference. First operand 79 states and 102 transitions. Second operand 27 states. [2020-09-21 10:30:02,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:02,304 INFO L93 Difference]: Finished difference Result 87 states and 111 transitions. [2020-09-21 10:30:02,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-09-21 10:30:02,305 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 78 [2020-09-21 10:30:02,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:02,306 INFO L225 Difference]: With dead ends: 87 [2020-09-21 10:30:02,306 INFO L226 Difference]: Without dead ends: 82 [2020-09-21 10:30:02,307 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=55, Invalid=701, Unknown=0, NotChecked=0, Total=756 [2020-09-21 10:30:02,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-09-21 10:30:02,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2020-09-21 10:30:02,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-09-21 10:30:02,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 106 transitions. [2020-09-21 10:30:02,316 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 106 transitions. Word has length 78 [2020-09-21 10:30:02,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:02,316 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 106 transitions. [2020-09-21 10:30:02,316 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-09-21 10:30:02,316 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 106 transitions. [2020-09-21 10:30:02,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-09-21 10:30:02,317 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:02,317 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:02,318 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-09-21 10:30:02,318 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:02,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:02,318 INFO L82 PathProgramCache]: Analyzing trace with hash 1353050185, now seen corresponding path program 23 times [2020-09-21 10:30:02,319 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:02,319 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [736763777] [2020-09-21 10:30:02,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:02,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:02,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:02,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:02,980 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 0 proven. 828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:30:02,980 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [736763777] [2020-09-21 10:30:02,981 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:02,981 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-09-21 10:30:02,981 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097858118] [2020-09-21 10:30:02,981 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-09-21 10:30:02,982 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:02,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-09-21 10:30:02,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2020-09-21 10:30:02,982 INFO L87 Difference]: Start difference. First operand 82 states and 106 transitions. Second operand 28 states. [2020-09-21 10:30:04,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:04,049 INFO L93 Difference]: Finished difference Result 90 states and 115 transitions. [2020-09-21 10:30:04,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-09-21 10:30:04,049 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 81 [2020-09-21 10:30:04,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:04,050 INFO L225 Difference]: With dead ends: 90 [2020-09-21 10:30:04,050 INFO L226 Difference]: Without dead ends: 85 [2020-09-21 10:30:04,051 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=57, Invalid=755, Unknown=0, NotChecked=0, Total=812 [2020-09-21 10:30:04,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-09-21 10:30:04,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2020-09-21 10:30:04,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-09-21 10:30:04,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 110 transitions. [2020-09-21 10:30:04,058 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 110 transitions. Word has length 81 [2020-09-21 10:30:04,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:04,058 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 110 transitions. [2020-09-21 10:30:04,058 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-09-21 10:30:04,058 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 110 transitions. [2020-09-21 10:30:04,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-09-21 10:30:04,059 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:04,059 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:04,059 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-09-21 10:30:04,060 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:04,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:04,060 INFO L82 PathProgramCache]: Analyzing trace with hash -22395406, now seen corresponding path program 24 times [2020-09-21 10:30:04,060 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:04,060 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [216456959] [2020-09-21 10:30:04,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:04,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:04,811 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:04,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:04,840 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:30:04,841 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [216456959] [2020-09-21 10:30:04,841 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:04,841 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-09-21 10:30:04,842 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021385532] [2020-09-21 10:30:04,842 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-09-21 10:30:04,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:04,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-09-21 10:30:04,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2020-09-21 10:30:04,843 INFO L87 Difference]: Start difference. First operand 85 states and 110 transitions. Second operand 29 states. [2020-09-21 10:30:05,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:05,872 INFO L93 Difference]: Finished difference Result 93 states and 119 transitions. [2020-09-21 10:30:05,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-09-21 10:30:05,872 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 84 [2020-09-21 10:30:05,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:05,874 INFO L225 Difference]: With dead ends: 93 [2020-09-21 10:30:05,874 INFO L226 Difference]: Without dead ends: 88 [2020-09-21 10:30:05,875 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=59, Invalid=811, Unknown=0, NotChecked=0, Total=870 [2020-09-21 10:30:05,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-09-21 10:30:05,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2020-09-21 10:30:05,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-09-21 10:30:05,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 114 transitions. [2020-09-21 10:30:05,882 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 114 transitions. Word has length 84 [2020-09-21 10:30:05,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:05,882 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 114 transitions. [2020-09-21 10:30:05,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-09-21 10:30:05,883 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 114 transitions. [2020-09-21 10:30:05,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-09-21 10:30:05,884 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:05,884 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:05,884 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-09-21 10:30:05,884 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:05,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:05,884 INFO L82 PathProgramCache]: Analyzing trace with hash -1933993047, now seen corresponding path program 25 times [2020-09-21 10:30:05,885 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:05,885 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [983466403] [2020-09-21 10:30:05,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:05,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:06,589 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:06,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:06,622 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 0 proven. 975 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:30:06,622 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [983466403] [2020-09-21 10:30:06,622 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:06,622 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-09-21 10:30:06,623 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522400322] [2020-09-21 10:30:06,623 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-09-21 10:30:06,623 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:06,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-09-21 10:30:06,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2020-09-21 10:30:06,624 INFO L87 Difference]: Start difference. First operand 88 states and 114 transitions. Second operand 30 states. [2020-09-21 10:30:07,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:07,798 INFO L93 Difference]: Finished difference Result 96 states and 123 transitions. [2020-09-21 10:30:07,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-09-21 10:30:07,799 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 87 [2020-09-21 10:30:07,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:07,801 INFO L225 Difference]: With dead ends: 96 [2020-09-21 10:30:07,801 INFO L226 Difference]: Without dead ends: 91 [2020-09-21 10:30:07,802 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=61, Invalid=869, Unknown=0, NotChecked=0, Total=930 [2020-09-21 10:30:07,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-09-21 10:30:07,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2020-09-21 10:30:07,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-09-21 10:30:07,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 118 transitions. [2020-09-21 10:30:07,809 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 118 transitions. Word has length 87 [2020-09-21 10:30:07,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:07,809 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 118 transitions. [2020-09-21 10:30:07,809 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-09-21 10:30:07,809 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 118 transitions. [2020-09-21 10:30:07,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-09-21 10:30:07,810 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:07,810 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:07,810 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-09-21 10:30:07,811 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:07,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:07,811 INFO L82 PathProgramCache]: Analyzing trace with hash 927028882, now seen corresponding path program 26 times [2020-09-21 10:30:07,811 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:07,811 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1702077787] [2020-09-21 10:30:07,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:07,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:08,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:08,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:08,634 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 0 proven. 1053 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:30:08,635 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1702077787] [2020-09-21 10:30:08,635 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:08,635 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-09-21 10:30:08,635 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621308664] [2020-09-21 10:30:08,635 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-09-21 10:30:08,636 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:08,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-09-21 10:30:08,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2020-09-21 10:30:08,636 INFO L87 Difference]: Start difference. First operand 91 states and 118 transitions. Second operand 31 states. [2020-09-21 10:30:09,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:09,923 INFO L93 Difference]: Finished difference Result 99 states and 127 transitions. [2020-09-21 10:30:09,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-09-21 10:30:09,924 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 90 [2020-09-21 10:30:09,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:09,925 INFO L225 Difference]: With dead ends: 99 [2020-09-21 10:30:09,925 INFO L226 Difference]: Without dead ends: 94 [2020-09-21 10:30:09,926 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=63, Invalid=929, Unknown=0, NotChecked=0, Total=992 [2020-09-21 10:30:09,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-09-21 10:30:09,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2020-09-21 10:30:09,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-09-21 10:30:09,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 122 transitions. [2020-09-21 10:30:09,933 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 122 transitions. Word has length 90 [2020-09-21 10:30:09,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:09,933 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 122 transitions. [2020-09-21 10:30:09,933 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-09-21 10:30:09,933 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 122 transitions. [2020-09-21 10:30:09,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-09-21 10:30:09,934 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:09,934 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:09,934 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-09-21 10:30:09,934 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:09,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:09,935 INFO L82 PathProgramCache]: Analyzing trace with hash 5326601, now seen corresponding path program 27 times [2020-09-21 10:30:09,935 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:09,935 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [707810731] [2020-09-21 10:30:09,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:09,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:10,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:10,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:10,804 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 0 proven. 1134 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:30:10,804 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [707810731] [2020-09-21 10:30:10,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:10,804 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-09-21 10:30:10,804 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20499436] [2020-09-21 10:30:10,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-09-21 10:30:10,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:10,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-09-21 10:30:10,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=931, Unknown=0, NotChecked=0, Total=992 [2020-09-21 10:30:10,806 INFO L87 Difference]: Start difference. First operand 94 states and 122 transitions. Second operand 32 states. [2020-09-21 10:30:12,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:12,188 INFO L93 Difference]: Finished difference Result 102 states and 131 transitions. [2020-09-21 10:30:12,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-09-21 10:30:12,189 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 93 [2020-09-21 10:30:12,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:12,190 INFO L225 Difference]: With dead ends: 102 [2020-09-21 10:30:12,190 INFO L226 Difference]: Without dead ends: 97 [2020-09-21 10:30:12,192 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=65, Invalid=991, Unknown=0, NotChecked=0, Total=1056 [2020-09-21 10:30:12,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-09-21 10:30:12,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2020-09-21 10:30:12,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-09-21 10:30:12,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 126 transitions. [2020-09-21 10:30:12,205 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 126 transitions. Word has length 93 [2020-09-21 10:30:12,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:12,205 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 126 transitions. [2020-09-21 10:30:12,206 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-09-21 10:30:12,206 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 126 transitions. [2020-09-21 10:30:12,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-09-21 10:30:12,206 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:12,207 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:12,207 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-09-21 10:30:12,207 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:12,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:12,207 INFO L82 PathProgramCache]: Analyzing trace with hash -701403342, now seen corresponding path program 28 times [2020-09-21 10:30:12,208 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:12,208 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1607972873] [2020-09-21 10:30:12,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:12,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:13,121 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:13,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:13,135 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 1218 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:30:13,136 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1607972873] [2020-09-21 10:30:13,136 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:13,136 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-09-21 10:30:13,136 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590405234] [2020-09-21 10:30:13,137 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-09-21 10:30:13,137 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:13,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-09-21 10:30:13,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2020-09-21 10:30:13,138 INFO L87 Difference]: Start difference. First operand 97 states and 126 transitions. Second operand 33 states. [2020-09-21 10:30:14,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:14,640 INFO L93 Difference]: Finished difference Result 105 states and 135 transitions. [2020-09-21 10:30:14,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-09-21 10:30:14,641 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 96 [2020-09-21 10:30:14,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:14,642 INFO L225 Difference]: With dead ends: 105 [2020-09-21 10:30:14,642 INFO L226 Difference]: Without dead ends: 100 [2020-09-21 10:30:14,644 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=67, Invalid=1055, Unknown=0, NotChecked=0, Total=1122 [2020-09-21 10:30:14,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-09-21 10:30:14,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2020-09-21 10:30:14,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-09-21 10:30:14,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 130 transitions. [2020-09-21 10:30:14,653 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 130 transitions. Word has length 96 [2020-09-21 10:30:14,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:14,653 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 130 transitions. [2020-09-21 10:30:14,653 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-09-21 10:30:14,653 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 130 transitions. [2020-09-21 10:30:14,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-09-21 10:30:14,654 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:14,654 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:14,655 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-09-21 10:30:14,655 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:14,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:14,655 INFO L82 PathProgramCache]: Analyzing trace with hash -963450263, now seen corresponding path program 29 times [2020-09-21 10:30:14,655 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:14,655 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [249445316] [2020-09-21 10:30:14,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:14,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:15,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:15,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:15,566 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 0 proven. 1305 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:30:15,567 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [249445316] [2020-09-21 10:30:15,567 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:15,567 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-09-21 10:30:15,567 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434334696] [2020-09-21 10:30:15,567 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-09-21 10:30:15,568 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:15,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-09-21 10:30:15,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=1057, Unknown=0, NotChecked=0, Total=1122 [2020-09-21 10:30:15,568 INFO L87 Difference]: Start difference. First operand 100 states and 130 transitions. Second operand 34 states. [2020-09-21 10:30:17,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:17,133 INFO L93 Difference]: Finished difference Result 108 states and 139 transitions. [2020-09-21 10:30:17,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-09-21 10:30:17,134 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 99 [2020-09-21 10:30:17,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:17,135 INFO L225 Difference]: With dead ends: 108 [2020-09-21 10:30:17,135 INFO L226 Difference]: Without dead ends: 103 [2020-09-21 10:30:17,136 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=69, Invalid=1121, Unknown=0, NotChecked=0, Total=1190 [2020-09-21 10:30:17,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-09-21 10:30:17,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2020-09-21 10:30:17,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-09-21 10:30:17,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 134 transitions. [2020-09-21 10:30:17,145 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 134 transitions. Word has length 99 [2020-09-21 10:30:17,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:17,145 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 134 transitions. [2020-09-21 10:30:17,145 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-09-21 10:30:17,145 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 134 transitions. [2020-09-21 10:30:17,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-09-21 10:30:17,146 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:17,146 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:17,147 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-09-21 10:30:17,147 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:17,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:17,147 INFO L82 PathProgramCache]: Analyzing trace with hash 647270354, now seen corresponding path program 30 times [2020-09-21 10:30:17,147 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:17,148 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [998031131] [2020-09-21 10:30:17,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:17,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:18,029 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:18,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:18,045 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 0 proven. 1395 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:30:18,046 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [998031131] [2020-09-21 10:30:18,046 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:18,046 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-09-21 10:30:18,046 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765930581] [2020-09-21 10:30:18,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-09-21 10:30:18,047 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:18,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-09-21 10:30:18,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2020-09-21 10:30:18,048 INFO L87 Difference]: Start difference. First operand 103 states and 134 transitions. Second operand 35 states. [2020-09-21 10:30:19,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:19,701 INFO L93 Difference]: Finished difference Result 111 states and 143 transitions. [2020-09-21 10:30:19,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-09-21 10:30:19,706 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 102 [2020-09-21 10:30:19,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:19,707 INFO L225 Difference]: With dead ends: 111 [2020-09-21 10:30:19,707 INFO L226 Difference]: Without dead ends: 106 [2020-09-21 10:30:19,708 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=71, Invalid=1189, Unknown=0, NotChecked=0, Total=1260 [2020-09-21 10:30:19,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-09-21 10:30:19,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2020-09-21 10:30:19,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-09-21 10:30:19,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 138 transitions. [2020-09-21 10:30:19,718 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 138 transitions. Word has length 102 [2020-09-21 10:30:19,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:19,718 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 138 transitions. [2020-09-21 10:30:19,719 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-09-21 10:30:19,719 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 138 transitions. [2020-09-21 10:30:19,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-09-21 10:30:19,720 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:19,720 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:19,720 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-09-21 10:30:19,720 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:19,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:19,720 INFO L82 PathProgramCache]: Analyzing trace with hash -2044426807, now seen corresponding path program 31 times [2020-09-21 10:30:19,721 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:19,721 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [486612025] [2020-09-21 10:30:19,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:19,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:20,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:20,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:20,729 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 0 proven. 1488 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:30:20,730 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [486612025] [2020-09-21 10:30:20,730 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:20,730 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-09-21 10:30:20,730 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930862063] [2020-09-21 10:30:20,730 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-09-21 10:30:20,731 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:20,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-09-21 10:30:20,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=1191, Unknown=0, NotChecked=0, Total=1260 [2020-09-21 10:30:20,731 INFO L87 Difference]: Start difference. First operand 106 states and 138 transitions. Second operand 36 states. [2020-09-21 10:30:22,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:22,507 INFO L93 Difference]: Finished difference Result 114 states and 147 transitions. [2020-09-21 10:30:22,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-09-21 10:30:22,508 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 105 [2020-09-21 10:30:22,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:22,509 INFO L225 Difference]: With dead ends: 114 [2020-09-21 10:30:22,509 INFO L226 Difference]: Without dead ends: 109 [2020-09-21 10:30:22,511 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=73, Invalid=1259, Unknown=0, NotChecked=0, Total=1332 [2020-09-21 10:30:22,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-09-21 10:30:22,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2020-09-21 10:30:22,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-09-21 10:30:22,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 142 transitions. [2020-09-21 10:30:22,520 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 142 transitions. Word has length 105 [2020-09-21 10:30:22,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:22,520 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 142 transitions. [2020-09-21 10:30:22,520 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-09-21 10:30:22,520 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 142 transitions. [2020-09-21 10:30:22,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-09-21 10:30:22,521 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:22,521 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:22,522 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-09-21 10:30:22,522 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:22,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:22,522 INFO L82 PathProgramCache]: Analyzing trace with hash 939833458, now seen corresponding path program 32 times [2020-09-21 10:30:22,522 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:22,522 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [708840342] [2020-09-21 10:30:22,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:22,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:23,542 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:23,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:23,560 INFO L134 CoverageAnalysis]: Checked inductivity of 1584 backedges. 0 proven. 1584 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:30:23,561 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [708840342] [2020-09-21 10:30:23,561 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:23,561 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-09-21 10:30:23,561 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105805986] [2020-09-21 10:30:23,561 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-09-21 10:30:23,561 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:23,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-09-21 10:30:23,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=1261, Unknown=0, NotChecked=0, Total=1332 [2020-09-21 10:30:23,562 INFO L87 Difference]: Start difference. First operand 109 states and 142 transitions. Second operand 37 states. [2020-09-21 10:30:25,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:25,442 INFO L93 Difference]: Finished difference Result 117 states and 151 transitions. [2020-09-21 10:30:25,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-09-21 10:30:25,443 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 108 [2020-09-21 10:30:25,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:25,444 INFO L225 Difference]: With dead ends: 117 [2020-09-21 10:30:25,444 INFO L226 Difference]: Without dead ends: 112 [2020-09-21 10:30:25,445 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=75, Invalid=1331, Unknown=0, NotChecked=0, Total=1406 [2020-09-21 10:30:25,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-09-21 10:30:25,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2020-09-21 10:30:25,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-09-21 10:30:25,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 146 transitions. [2020-09-21 10:30:25,454 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 146 transitions. Word has length 108 [2020-09-21 10:30:25,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:25,455 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 146 transitions. [2020-09-21 10:30:25,455 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-09-21 10:30:25,455 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 146 transitions. [2020-09-21 10:30:25,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2020-09-21 10:30:25,456 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:25,456 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:25,456 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-09-21 10:30:25,456 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:25,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:25,457 INFO L82 PathProgramCache]: Analyzing trace with hash -785639127, now seen corresponding path program 33 times [2020-09-21 10:30:25,457 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:25,457 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1839172028] [2020-09-21 10:30:25,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:25,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:26,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:26,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:26,658 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 0 proven. 1683 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:30:26,658 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1839172028] [2020-09-21 10:30:26,658 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:26,658 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-09-21 10:30:26,658 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087658798] [2020-09-21 10:30:26,659 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-09-21 10:30:26,659 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:26,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-09-21 10:30:26,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=1333, Unknown=0, NotChecked=0, Total=1406 [2020-09-21 10:30:26,660 INFO L87 Difference]: Start difference. First operand 112 states and 146 transitions. Second operand 38 states. [2020-09-21 10:30:28,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:28,659 INFO L93 Difference]: Finished difference Result 120 states and 155 transitions. [2020-09-21 10:30:28,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-09-21 10:30:28,661 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 111 [2020-09-21 10:30:28,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:28,663 INFO L225 Difference]: With dead ends: 120 [2020-09-21 10:30:28,663 INFO L226 Difference]: Without dead ends: 115 [2020-09-21 10:30:28,664 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=77, Invalid=1405, Unknown=0, NotChecked=0, Total=1482 [2020-09-21 10:30:28,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2020-09-21 10:30:28,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2020-09-21 10:30:28,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-09-21 10:30:28,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 150 transitions. [2020-09-21 10:30:28,673 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 150 transitions. Word has length 111 [2020-09-21 10:30:28,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:28,673 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 150 transitions. [2020-09-21 10:30:28,673 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-09-21 10:30:28,674 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 150 transitions. [2020-09-21 10:30:28,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-09-21 10:30:28,675 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:28,675 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:28,675 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-09-21 10:30:28,675 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:28,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:28,676 INFO L82 PathProgramCache]: Analyzing trace with hash 2124146962, now seen corresponding path program 34 times [2020-09-21 10:30:28,676 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:28,676 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1170079384] [2020-09-21 10:30:28,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:28,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:29,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:29,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:29,906 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 0 proven. 1785 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:30:29,906 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1170079384] [2020-09-21 10:30:29,907 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:29,907 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-09-21 10:30:29,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610032567] [2020-09-21 10:30:29,907 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-09-21 10:30:29,907 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:29,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-09-21 10:30:29,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=1407, Unknown=0, NotChecked=0, Total=1482 [2020-09-21 10:30:29,908 INFO L87 Difference]: Start difference. First operand 115 states and 150 transitions. Second operand 39 states. [2020-09-21 10:30:32,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:32,033 INFO L93 Difference]: Finished difference Result 123 states and 159 transitions. [2020-09-21 10:30:32,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-09-21 10:30:32,034 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 114 [2020-09-21 10:30:32,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:32,035 INFO L225 Difference]: With dead ends: 123 [2020-09-21 10:30:32,035 INFO L226 Difference]: Without dead ends: 118 [2020-09-21 10:30:32,037 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=79, Invalid=1481, Unknown=0, NotChecked=0, Total=1560 [2020-09-21 10:30:32,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-09-21 10:30:32,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2020-09-21 10:30:32,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2020-09-21 10:30:32,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 154 transitions. [2020-09-21 10:30:32,046 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 154 transitions. Word has length 114 [2020-09-21 10:30:32,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:32,047 INFO L479 AbstractCegarLoop]: Abstraction has 118 states and 154 transitions. [2020-09-21 10:30:32,047 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-09-21 10:30:32,047 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 154 transitions. [2020-09-21 10:30:32,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-09-21 10:30:32,048 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:32,048 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:32,048 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-09-21 10:30:32,048 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:32,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:32,049 INFO L82 PathProgramCache]: Analyzing trace with hash -2058378103, now seen corresponding path program 35 times [2020-09-21 10:30:32,049 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:32,049 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [210069987] [2020-09-21 10:30:32,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:32,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:33,313 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:33,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:33,334 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 0 proven. 1890 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:30:33,334 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [210069987] [2020-09-21 10:30:33,334 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:33,335 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-09-21 10:30:33,335 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20635201] [2020-09-21 10:30:33,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-09-21 10:30:33,335 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:33,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-09-21 10:30:33,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=1483, Unknown=0, NotChecked=0, Total=1560 [2020-09-21 10:30:33,336 INFO L87 Difference]: Start difference. First operand 118 states and 154 transitions. Second operand 40 states. [2020-09-21 10:30:35,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:35,606 INFO L93 Difference]: Finished difference Result 126 states and 163 transitions. [2020-09-21 10:30:35,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-09-21 10:30:35,606 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 117 [2020-09-21 10:30:35,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:35,608 INFO L225 Difference]: With dead ends: 126 [2020-09-21 10:30:35,608 INFO L226 Difference]: Without dead ends: 121 [2020-09-21 10:30:35,609 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=81, Invalid=1559, Unknown=0, NotChecked=0, Total=1640 [2020-09-21 10:30:35,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2020-09-21 10:30:35,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2020-09-21 10:30:35,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-09-21 10:30:35,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 158 transitions. [2020-09-21 10:30:35,618 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 158 transitions. Word has length 117 [2020-09-21 10:30:35,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:35,619 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 158 transitions. [2020-09-21 10:30:35,619 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-09-21 10:30:35,619 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 158 transitions. [2020-09-21 10:30:35,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-09-21 10:30:35,620 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:35,620 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:35,620 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-09-21 10:30:35,620 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:35,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:35,621 INFO L82 PathProgramCache]: Analyzing trace with hash 1928602034, now seen corresponding path program 36 times [2020-09-21 10:30:35,621 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:35,621 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1292285156] [2020-09-21 10:30:35,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:35,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:36,972 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:36,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:36,995 INFO L134 CoverageAnalysis]: Checked inductivity of 1998 backedges. 0 proven. 1998 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:30:36,995 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1292285156] [2020-09-21 10:30:36,995 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:36,995 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-09-21 10:30:36,996 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424139236] [2020-09-21 10:30:36,996 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-09-21 10:30:36,996 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:36,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-09-21 10:30:36,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1561, Unknown=0, NotChecked=0, Total=1640 [2020-09-21 10:30:36,997 INFO L87 Difference]: Start difference. First operand 121 states and 158 transitions. Second operand 41 states. [2020-09-21 10:30:39,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:39,395 INFO L93 Difference]: Finished difference Result 129 states and 167 transitions. [2020-09-21 10:30:39,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-09-21 10:30:39,395 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 120 [2020-09-21 10:30:39,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:39,397 INFO L225 Difference]: With dead ends: 129 [2020-09-21 10:30:39,398 INFO L226 Difference]: Without dead ends: 124 [2020-09-21 10:30:39,399 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=83, Invalid=1639, Unknown=0, NotChecked=0, Total=1722 [2020-09-21 10:30:39,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-09-21 10:30:39,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2020-09-21 10:30:39,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-09-21 10:30:39,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 162 transitions. [2020-09-21 10:30:39,409 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 162 transitions. Word has length 120 [2020-09-21 10:30:39,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:39,409 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 162 transitions. [2020-09-21 10:30:39,409 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-09-21 10:30:39,409 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 162 transitions. [2020-09-21 10:30:39,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-09-21 10:30:39,410 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:39,410 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:39,411 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-09-21 10:30:39,411 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:39,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:39,411 INFO L82 PathProgramCache]: Analyzing trace with hash 733292521, now seen corresponding path program 37 times [2020-09-21 10:30:39,411 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:39,411 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1969420442] [2020-09-21 10:30:39,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:39,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:40,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:40,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:40,872 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 0 proven. 2109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:30:40,872 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1969420442] [2020-09-21 10:30:40,873 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:40,873 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-09-21 10:30:40,873 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [924354622] [2020-09-21 10:30:40,873 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-09-21 10:30:40,873 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:40,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-09-21 10:30:40,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1641, Unknown=0, NotChecked=0, Total=1722 [2020-09-21 10:30:40,874 INFO L87 Difference]: Start difference. First operand 124 states and 162 transitions. Second operand 42 states. [2020-09-21 10:30:43,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:43,381 INFO L93 Difference]: Finished difference Result 132 states and 171 transitions. [2020-09-21 10:30:43,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-09-21 10:30:43,381 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 123 [2020-09-21 10:30:43,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:43,383 INFO L225 Difference]: With dead ends: 132 [2020-09-21 10:30:43,383 INFO L226 Difference]: Without dead ends: 127 [2020-09-21 10:30:43,384 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=85, Invalid=1721, Unknown=0, NotChecked=0, Total=1806 [2020-09-21 10:30:43,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2020-09-21 10:30:43,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2020-09-21 10:30:43,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-09-21 10:30:43,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 166 transitions. [2020-09-21 10:30:43,394 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 166 transitions. Word has length 123 [2020-09-21 10:30:43,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:43,395 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 166 transitions. [2020-09-21 10:30:43,395 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-09-21 10:30:43,395 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 166 transitions. [2020-09-21 10:30:43,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-09-21 10:30:43,396 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:43,396 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:43,396 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-09-21 10:30:43,396 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:43,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:43,397 INFO L82 PathProgramCache]: Analyzing trace with hash 841441874, now seen corresponding path program 38 times [2020-09-21 10:30:43,397 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:43,397 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [659878964] [2020-09-21 10:30:43,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:43,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat