/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=DEEPEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test24-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 20:34:53,055 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-21 20:34:53,081 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 20:34:53,083 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 20:34:53,085 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 20:34:53,087 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 20:34:53,088 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 20:34:53,089 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 20:34:53,090 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 20:34:53,091 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 20:34:53,091 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 20:34:53,093 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 20:34:53,094 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 20:34:53,095 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 20:34:53,096 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 20:34:53,097 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 20:34:53,098 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 20:34:53,100 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 20:34:53,101 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 20:34:53,103 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 20:34:53,104 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 20:34:53,105 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 20:34:53,107 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 20:34:53,115 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 20:34:53,116 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 20:34:53,116 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 20:34:53,117 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 20:34:53,140 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 20:34:53,140 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 20:34:53,141 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 20:34:53,141 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 20:34:53,142 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 20:34:53,142 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 20:34:53,142 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 20:34:53,142 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 20:34:53,142 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 20:34:53,143 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 20:34:53,143 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 20:34:53,143 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 20:34:53,143 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 20:34:53,143 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 20:34:53,144 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 20:34:53,144 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 20:34:53,144 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 20:34:53,144 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 20:34:53,144 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 20:34:53,145 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 20:34:53,145 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 20:34:53,145 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 20:34:53,145 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 20:34:53,145 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 20:34:53,146 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 20:34:53,146 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 20:34:53,146 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 20:34:53,146 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 20:34:53,147 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 20:34:53,147 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; [2020-08-21 20:34:53,474 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 20:34:53,492 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 20:34:53,495 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 20:34:53,497 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 20:34:53,497 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 20:34:53,497 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test24-2.c [2020-08-21 20:34:53,555 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ba423a2d8/cebf8be04f594c93b4d0a247f43cd6b5/FLAGbfff6be34 [2020-08-21 20:34:54,012 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 20:34:54,013 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test24-2.c [2020-08-21 20:34:54,019 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ba423a2d8/cebf8be04f594c93b4d0a247f43cd6b5/FLAGbfff6be34 [2020-08-21 20:34:54,372 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ba423a2d8/cebf8be04f594c93b4d0a247f43cd6b5 [2020-08-21 20:34:54,383 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 20:34:54,385 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 20:34:54,388 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 20:34:54,388 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 20:34:54,392 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 20:34:54,393 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 08:34:54" (1/1) ... [2020-08-21 20:34:54,396 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@53bd63ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:34:54, skipping insertion in model container [2020-08-21 20:34:54,396 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 08:34:54" (1/1) ... [2020-08-21 20:34:54,404 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 20:34:54,423 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 20:34:54,606 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 20:34:54,616 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 20:34:54,636 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 20:34:54,736 INFO L208 MainTranslator]: Completed translation [2020-08-21 20:34:54,737 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:34:54 WrapperNode [2020-08-21 20:34:54,737 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 20:34:54,738 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 20:34:54,739 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 20:34:54,739 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 20:34:54,749 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:34:54" (1/1) ... [2020-08-21 20:34:54,749 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:34:54" (1/1) ... [2020-08-21 20:34:54,757 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:34:54" (1/1) ... [2020-08-21 20:34:54,757 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:34:54" (1/1) ... [2020-08-21 20:34:54,765 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:34:54" (1/1) ... [2020-08-21 20:34:54,769 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:34:54" (1/1) ... [2020-08-21 20:34:54,771 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:34:54" (1/1) ... [2020-08-21 20:34:54,773 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 20:34:54,773 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 20:34:54,773 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 20:34:54,774 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 20:34:54,774 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:34:54" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 20:34:54,842 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 20:34:54,842 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 20:34:54,842 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-21 20:34:54,843 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 20:34:54,843 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 20:34:54,843 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 20:34:54,843 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-21 20:34:54,844 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 20:34:54,844 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 20:34:54,845 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 20:34:54,845 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 20:34:54,845 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 20:34:54,846 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 20:34:54,846 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 20:34:55,139 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 20:34:55,139 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-21 20:34:55,148 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 08:34:55 BoogieIcfgContainer [2020-08-21 20:34:55,148 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 20:34:55,155 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 20:34:55,155 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 20:34:55,164 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 20:34:55,164 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 08:34:54" (1/3) ... [2020-08-21 20:34:55,165 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6155de3d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 08:34:55, skipping insertion in model container [2020-08-21 20:34:55,165 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:34:54" (2/3) ... [2020-08-21 20:34:55,166 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6155de3d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 08:34:55, skipping insertion in model container [2020-08-21 20:34:55,166 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 08:34:55" (3/3) ... [2020-08-21 20:34:55,167 INFO L109 eAbstractionObserver]: Analyzing ICFG test24-2.c [2020-08-21 20:34:55,175 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 20:34:55,181 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 20:34:55,193 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 20:34:55,216 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 20:34:55,216 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 20:34:55,216 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 20:34:55,216 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 20:34:55,216 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 20:34:55,216 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 20:34:55,217 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 20:34:55,217 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 20:34:55,235 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-21 20:34:55,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 20:34:55,241 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:34:55,242 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:34:55,243 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:34:55,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:34:55,249 INFO L82 PathProgramCache]: Analyzing trace with hash 855240046, now seen corresponding path program 1 times [2020-08-21 20:34:55,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:34:55,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1644302451] [2020-08-21 20:34:55,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:34:55,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:55,420 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:34:55,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:55,430 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 20:34:55,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:55,447 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:34:55,448 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1644302451] [2020-08-21 20:34:55,450 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:34:55,451 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 20:34:55,452 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705595144] [2020-08-21 20:34:55,457 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 20:34:55,457 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:34:55,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 20:34:55,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 20:34:55,475 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-21 20:34:55,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:34:55,571 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2020-08-21 20:34:55,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 20:34:55,573 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-21 20:34:55,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:34:55,584 INFO L225 Difference]: With dead ends: 42 [2020-08-21 20:34:55,584 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 20:34:55,588 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 20:34:55,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 20:34:55,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 20:34:55,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 20:34:55,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-08-21 20:34:55,629 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-08-21 20:34:55,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:34:55,630 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-08-21 20:34:55,630 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 20:34:55,630 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-08-21 20:34:55,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 20:34:55,631 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:34:55,631 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:34:55,632 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 20:34:55,632 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:34:55,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:34:55,633 INFO L82 PathProgramCache]: Analyzing trace with hash -1631497781, now seen corresponding path program 1 times [2020-08-21 20:34:55,633 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:34:55,633 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [646145900] [2020-08-21 20:34:55,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:34:55,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:55,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:34:55,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:55,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-21 20:34:55,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:55,730 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:34:55,731 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [646145900] [2020-08-21 20:34:55,731 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:34:55,732 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 20:34:55,732 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [508247151] [2020-08-21 20:34:55,734 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 20:34:55,734 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:34:55,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 20:34:55,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 20:34:55,735 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-08-21 20:34:55,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:34:55,829 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-08-21 20:34:55,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 20:34:55,830 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-08-21 20:34:55,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:34:55,831 INFO L225 Difference]: With dead ends: 34 [2020-08-21 20:34:55,831 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 20:34:55,833 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 20:34:55,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 20:34:55,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-21 20:34:55,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 20:34:55,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-21 20:34:55,840 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-08-21 20:34:55,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:34:55,841 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-21 20:34:55,841 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 20:34:55,841 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-21 20:34:55,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 20:34:55,842 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:34:55,842 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:34:55,842 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 20:34:55,843 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:34:55,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:34:55,843 INFO L82 PathProgramCache]: Analyzing trace with hash 1934775405, now seen corresponding path program 1 times [2020-08-21 20:34:55,844 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:34:55,844 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1879545738] [2020-08-21 20:34:55,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:34:55,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:55,905 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:34:55,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:55,911 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-08-21 20:34:55,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:55,920 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:34:55,920 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1879545738] [2020-08-21 20:34:55,921 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:34:55,921 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 20:34:55,921 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [740339134] [2020-08-21 20:34:55,922 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 20:34:55,922 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:34:55,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 20:34:55,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:34:55,923 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-08-21 20:34:55,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:34:55,985 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-08-21 20:34:55,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 20:34:55,986 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-08-21 20:34:55,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:34:55,987 INFO L225 Difference]: With dead ends: 36 [2020-08-21 20:34:55,987 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 20:34:55,988 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:34:55,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 20:34:55,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-21 20:34:55,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 20:34:55,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-21 20:34:55,994 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-08-21 20:34:55,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:34:55,995 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-21 20:34:55,995 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 20:34:55,995 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-21 20:34:55,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 20:34:55,996 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:34:55,996 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:34:55,996 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 20:34:55,997 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:34:55,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:34:55,997 INFO L82 PathProgramCache]: Analyzing trace with hash 1739404943, now seen corresponding path program 2 times [2020-08-21 20:34:55,998 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:34:55,998 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1796906641] [2020-08-21 20:34:55,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:34:56,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:56,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:34:56,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:56,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-21 20:34:56,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:56,105 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:34:56,106 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1796906641] [2020-08-21 20:34:56,106 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:34:56,106 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 20:34:56,107 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1280617823] [2020-08-21 20:34:56,107 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 20:34:56,107 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:34:56,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 20:34:56,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 20:34:56,108 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-08-21 20:34:56,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:34:56,201 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-08-21 20:34:56,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 20:34:56,201 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-21 20:34:56,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:34:56,203 INFO L225 Difference]: With dead ends: 38 [2020-08-21 20:34:56,203 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 20:34:56,204 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 20:34:56,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 20:34:56,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-21 20:34:56,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 20:34:56,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-21 20:34:56,210 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-08-21 20:34:56,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:34:56,211 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-21 20:34:56,211 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 20:34:56,211 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-21 20:34:56,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 20:34:56,212 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:34:56,213 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:34:56,213 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 20:34:56,213 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:34:56,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:34:56,214 INFO L82 PathProgramCache]: Analyzing trace with hash -1328015311, now seen corresponding path program 3 times [2020-08-21 20:34:56,214 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:34:56,227 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [583578095] [2020-08-21 20:34:56,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:34:56,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:56,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:34:56,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:56,313 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-21 20:34:56,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:56,321 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:34:56,321 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [583578095] [2020-08-21 20:34:56,321 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:34:56,322 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 20:34:56,322 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217096481] [2020-08-21 20:34:56,322 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 20:34:56,323 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:34:56,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 20:34:56,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 20:34:56,324 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2020-08-21 20:34:56,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:34:56,389 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-08-21 20:34:56,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 20:34:56,390 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-08-21 20:34:56,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:34:56,391 INFO L225 Difference]: With dead ends: 40 [2020-08-21 20:34:56,391 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 20:34:56,392 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 20:34:56,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 20:34:56,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-21 20:34:56,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 20:34:56,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-21 20:34:56,399 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-08-21 20:34:56,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:34:56,399 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-21 20:34:56,399 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 20:34:56,399 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-21 20:34:56,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 20:34:56,400 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:34:56,401 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:34:56,401 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 20:34:56,401 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:34:56,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:34:56,402 INFO L82 PathProgramCache]: Analyzing trace with hash 1523652947, now seen corresponding path program 4 times [2020-08-21 20:34:56,402 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:34:56,402 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [334631514] [2020-08-21 20:34:56,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:34:56,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:56,492 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:34:56,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:56,497 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-21 20:34:56,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:56,503 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:34:56,503 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [334631514] [2020-08-21 20:34:56,504 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:34:56,504 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 20:34:56,504 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646237960] [2020-08-21 20:34:56,505 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 20:34:56,505 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:34:56,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 20:34:56,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:34:56,506 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2020-08-21 20:34:56,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:34:56,569 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-08-21 20:34:56,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 20:34:56,569 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-08-21 20:34:56,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:34:56,570 INFO L225 Difference]: With dead ends: 42 [2020-08-21 20:34:56,571 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 20:34:56,571 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:34:56,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 20:34:56,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 20:34:56,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 20:34:56,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-08-21 20:34:56,577 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-08-21 20:34:56,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:34:56,578 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-08-21 20:34:56,578 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 20:34:56,578 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-08-21 20:34:56,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 20:34:56,579 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:34:56,579 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:34:56,579 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 20:34:56,579 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:34:56,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:34:56,580 INFO L82 PathProgramCache]: Analyzing trace with hash 1787714037, now seen corresponding path program 5 times [2020-08-21 20:34:56,580 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:34:56,581 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [551781592] [2020-08-21 20:34:56,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:34:56,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:56,682 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:34:56,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:56,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-21 20:34:56,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:56,691 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:34:56,691 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [551781592] [2020-08-21 20:34:56,692 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:34:56,692 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 20:34:56,692 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382825663] [2020-08-21 20:34:56,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 20:34:56,693 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:34:56,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 20:34:56,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 20:34:56,694 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-08-21 20:34:56,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:34:56,777 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-08-21 20:34:56,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 20:34:56,777 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-08-21 20:34:56,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:34:56,778 INFO L225 Difference]: With dead ends: 44 [2020-08-21 20:34:56,779 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 20:34:56,779 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 20:34:56,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 20:34:56,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 20:34:56,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 20:34:56,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-08-21 20:34:56,785 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-08-21 20:34:56,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:34:56,786 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-08-21 20:34:56,786 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 20:34:56,786 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-08-21 20:34:56,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 20:34:56,787 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:34:56,787 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:34:56,788 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 20:34:56,788 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:34:56,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:34:56,788 INFO L82 PathProgramCache]: Analyzing trace with hash 2147351063, now seen corresponding path program 6 times [2020-08-21 20:34:56,789 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:34:56,789 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [884173322] [2020-08-21 20:34:56,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:34:56,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:56,889 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:34:56,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:56,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 20:34:56,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:56,898 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:34:56,899 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [884173322] [2020-08-21 20:34:56,899 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:34:56,899 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 20:34:56,899 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974817167] [2020-08-21 20:34:56,900 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 20:34:56,900 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:34:56,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 20:34:56,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:34:56,901 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2020-08-21 20:34:56,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:34:56,970 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-08-21 20:34:56,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 20:34:56,970 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-08-21 20:34:56,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:34:56,971 INFO L225 Difference]: With dead ends: 46 [2020-08-21 20:34:56,971 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 20:34:56,972 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:34:56,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 20:34:56,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 20:34:56,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 20:34:56,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-21 20:34:56,978 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-08-21 20:34:56,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:34:56,978 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-21 20:34:56,978 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 20:34:56,978 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-21 20:34:56,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 20:34:56,979 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:34:56,979 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:34:56,980 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 20:34:56,980 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:34:56,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:34:56,980 INFO L82 PathProgramCache]: Analyzing trace with hash -133817927, now seen corresponding path program 7 times [2020-08-21 20:34:56,981 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:34:56,981 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1848143925] [2020-08-21 20:34:56,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:34:57,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:57,094 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:34:57,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:57,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-21 20:34:57,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:57,106 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:34:57,107 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1848143925] [2020-08-21 20:34:57,107 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:34:57,107 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 20:34:57,108 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128562128] [2020-08-21 20:34:57,108 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 20:34:57,109 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:34:57,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 20:34:57,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 20:34:57,110 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-21 20:34:57,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:34:57,205 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-21 20:34:57,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 20:34:57,206 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-08-21 20:34:57,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:34:57,207 INFO L225 Difference]: With dead ends: 48 [2020-08-21 20:34:57,207 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 20:34:57,208 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 20:34:57,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 20:34:57,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 20:34:57,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 20:34:57,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-08-21 20:34:57,214 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-08-21 20:34:57,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:34:57,215 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-08-21 20:34:57,215 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 20:34:57,215 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-08-21 20:34:57,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 20:34:57,216 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:34:57,216 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:34:57,216 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 20:34:57,217 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:34:57,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:34:57,217 INFO L82 PathProgramCache]: Analyzing trace with hash -1903896357, now seen corresponding path program 8 times [2020-08-21 20:34:57,218 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:34:57,218 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [351963410] [2020-08-21 20:34:57,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:34:57,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:57,364 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:34:57,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:57,368 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-21 20:34:57,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:57,374 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:34:57,374 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [351963410] [2020-08-21 20:34:57,375 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:34:57,375 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 20:34:57,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570691883] [2020-08-21 20:34:57,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 20:34:57,376 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:34:57,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 20:34:57,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 20:34:57,378 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 12 states. [2020-08-21 20:34:57,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:34:57,472 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-08-21 20:34:57,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 20:34:57,473 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-21 20:34:57,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:34:57,474 INFO L225 Difference]: With dead ends: 50 [2020-08-21 20:34:57,475 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 20:34:57,476 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 20:34:57,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 20:34:57,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 20:34:57,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 20:34:57,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-08-21 20:34:57,486 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-08-21 20:34:57,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:34:57,489 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-08-21 20:34:57,489 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 20:34:57,489 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-08-21 20:34:57,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 20:34:57,493 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:34:57,493 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:34:57,494 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 20:34:57,494 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:34:57,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:34:57,494 INFO L82 PathProgramCache]: Analyzing trace with hash -2142218371, now seen corresponding path program 9 times [2020-08-21 20:34:57,495 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:34:57,495 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1536874735] [2020-08-21 20:34:57,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:34:57,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:57,690 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:34:57,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:57,693 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-21 20:34:57,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:57,702 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:34:57,702 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1536874735] [2020-08-21 20:34:57,703 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:34:57,703 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 20:34:57,703 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1478241105] [2020-08-21 20:34:57,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 20:34:57,706 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:34:57,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 20:34:57,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 20:34:57,707 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 13 states. [2020-08-21 20:34:57,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:34:57,809 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2020-08-21 20:34:57,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 20:34:57,810 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-21 20:34:57,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:34:57,811 INFO L225 Difference]: With dead ends: 52 [2020-08-21 20:34:57,811 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 20:34:57,812 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 20:34:57,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 20:34:57,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-21 20:34:57,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 20:34:57,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-21 20:34:57,820 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-08-21 20:34:57,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:34:57,822 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-21 20:34:57,822 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 20:34:57,822 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-21 20:34:57,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 20:34:57,824 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:34:57,824 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:34:57,824 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 20:34:57,824 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:34:57,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:34:57,825 INFO L82 PathProgramCache]: Analyzing trace with hash 758560159, now seen corresponding path program 10 times [2020-08-21 20:34:57,825 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:34:57,826 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1595908485] [2020-08-21 20:34:57,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:34:57,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:57,994 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:34:57,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:57,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-21 20:34:58,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:58,004 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:34:58,004 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1595908485] [2020-08-21 20:34:58,004 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:34:58,004 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 20:34:58,005 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [342424559] [2020-08-21 20:34:58,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 20:34:58,005 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:34:58,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 20:34:58,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-21 20:34:58,006 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 14 states. [2020-08-21 20:34:58,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:34:58,096 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2020-08-21 20:34:58,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 20:34:58,098 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 38 [2020-08-21 20:34:58,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:34:58,099 INFO L225 Difference]: With dead ends: 54 [2020-08-21 20:34:58,099 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 20:34:58,100 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-21 20:34:58,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 20:34:58,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-21 20:34:58,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 20:34:58,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-08-21 20:34:58,109 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-08-21 20:34:58,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:34:58,109 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-08-21 20:34:58,109 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 20:34:58,110 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-08-21 20:34:58,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 20:34:58,110 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:34:58,110 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:34:58,111 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 20:34:58,111 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:34:58,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:34:58,111 INFO L82 PathProgramCache]: Analyzing trace with hash 972952385, now seen corresponding path program 11 times [2020-08-21 20:34:58,111 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:34:58,113 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [206635125] [2020-08-21 20:34:58,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:34:58,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:58,295 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:34:58,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:58,298 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-21 20:34:58,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:58,303 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:34:58,303 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [206635125] [2020-08-21 20:34:58,304 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:34:58,304 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 20:34:58,304 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1766771359] [2020-08-21 20:34:58,305 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 20:34:58,305 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:34:58,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 20:34:58,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-21 20:34:58,307 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 15 states. [2020-08-21 20:34:58,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:34:58,397 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2020-08-21 20:34:58,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 20:34:58,397 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 40 [2020-08-21 20:34:58,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:34:58,398 INFO L225 Difference]: With dead ends: 56 [2020-08-21 20:34:58,399 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 20:34:58,399 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-21 20:34:58,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 20:34:58,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-21 20:34:58,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 20:34:58,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-08-21 20:34:58,413 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-08-21 20:34:58,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:34:58,413 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-08-21 20:34:58,413 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 20:34:58,414 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-08-21 20:34:58,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 20:34:58,414 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:34:58,418 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:34:58,418 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 20:34:58,418 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:34:58,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:34:58,419 INFO L82 PathProgramCache]: Analyzing trace with hash 845451363, now seen corresponding path program 12 times [2020-08-21 20:34:58,419 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:34:58,420 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1711218916] [2020-08-21 20:34:58,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:34:58,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:58,604 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:34:58,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:58,607 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2020-08-21 20:34:58,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:58,613 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:34:58,613 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1711218916] [2020-08-21 20:34:58,613 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:34:58,614 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 20:34:58,614 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908543926] [2020-08-21 20:34:58,615 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 20:34:58,615 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:34:58,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 20:34:58,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-21 20:34:58,616 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 16 states. [2020-08-21 20:34:58,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:34:58,706 INFO L93 Difference]: Finished difference Result 58 states and 60 transitions. [2020-08-21 20:34:58,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 20:34:58,707 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 42 [2020-08-21 20:34:58,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:34:58,708 INFO L225 Difference]: With dead ends: 58 [2020-08-21 20:34:58,708 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 20:34:58,709 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-21 20:34:58,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 20:34:58,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-21 20:34:58,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 20:34:58,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-08-21 20:34:58,718 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 42 [2020-08-21 20:34:58,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:34:58,718 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-08-21 20:34:58,719 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 20:34:58,719 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-08-21 20:34:58,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 20:34:58,719 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:34:58,720 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:34:58,722 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 20:34:58,722 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:34:58,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:34:58,723 INFO L82 PathProgramCache]: Analyzing trace with hash -1423946491, now seen corresponding path program 13 times [2020-08-21 20:34:58,723 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:34:58,724 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1053195657] [2020-08-21 20:34:58,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:34:58,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:58,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:34:58,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:58,954 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-21 20:34:58,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:58,960 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:34:58,961 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1053195657] [2020-08-21 20:34:58,961 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:34:58,961 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 20:34:58,961 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [691387413] [2020-08-21 20:34:58,962 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 20:34:58,962 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:34:58,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 20:34:58,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-21 20:34:58,963 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 17 states. [2020-08-21 20:34:59,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:34:59,081 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2020-08-21 20:34:59,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 20:34:59,081 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 44 [2020-08-21 20:34:59,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:34:59,082 INFO L225 Difference]: With dead ends: 60 [2020-08-21 20:34:59,082 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 20:34:59,083 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-21 20:34:59,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 20:34:59,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-08-21 20:34:59,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 20:34:59,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2020-08-21 20:34:59,088 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 44 [2020-08-21 20:34:59,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:34:59,088 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2020-08-21 20:34:59,088 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 20:34:59,088 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2020-08-21 20:34:59,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 20:34:59,089 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:34:59,089 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:34:59,089 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 20:34:59,090 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:34:59,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:34:59,090 INFO L82 PathProgramCache]: Analyzing trace with hash -471897817, now seen corresponding path program 14 times [2020-08-21 20:34:59,090 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:34:59,091 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [315530320] [2020-08-21 20:34:59,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:34:59,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:59,276 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:34:59,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:59,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2020-08-21 20:34:59,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:59,283 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:34:59,283 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [315530320] [2020-08-21 20:34:59,284 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:34:59,284 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 20:34:59,284 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662243406] [2020-08-21 20:34:59,285 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 20:34:59,285 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:34:59,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 20:34:59,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-21 20:34:59,286 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 18 states. [2020-08-21 20:34:59,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:34:59,376 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2020-08-21 20:34:59,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 20:34:59,377 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 46 [2020-08-21 20:34:59,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:34:59,378 INFO L225 Difference]: With dead ends: 62 [2020-08-21 20:34:59,378 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 20:34:59,379 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-21 20:34:59,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 20:34:59,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-08-21 20:34:59,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 20:34:59,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2020-08-21 20:34:59,384 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 46 [2020-08-21 20:34:59,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:34:59,384 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2020-08-21 20:34:59,384 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 20:34:59,384 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2020-08-21 20:34:59,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 20:34:59,385 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:34:59,385 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:34:59,385 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 20:34:59,386 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:34:59,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:34:59,386 INFO L82 PathProgramCache]: Analyzing trace with hash -381156151, now seen corresponding path program 15 times [2020-08-21 20:34:59,386 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:34:59,386 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1334802828] [2020-08-21 20:34:59,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:34:59,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:59,644 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:34:59,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:59,647 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2020-08-21 20:34:59,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:34:59,652 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:34:59,652 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1334802828] [2020-08-21 20:34:59,652 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:34:59,653 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 20:34:59,653 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139805773] [2020-08-21 20:34:59,653 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 20:34:59,654 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:34:59,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 20:34:59,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-21 20:34:59,654 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 19 states. [2020-08-21 20:34:59,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:34:59,777 INFO L93 Difference]: Finished difference Result 64 states and 66 transitions. [2020-08-21 20:34:59,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 20:34:59,777 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 48 [2020-08-21 20:34:59,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:34:59,778 INFO L225 Difference]: With dead ends: 64 [2020-08-21 20:34:59,778 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 20:34:59,779 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-21 20:34:59,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 20:34:59,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-21 20:34:59,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 20:34:59,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-08-21 20:34:59,783 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 48 [2020-08-21 20:34:59,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:34:59,784 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-08-21 20:34:59,784 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 20:34:59,784 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-08-21 20:34:59,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 20:34:59,785 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:34:59,785 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:34:59,785 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 20:34:59,785 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:34:59,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:34:59,786 INFO L82 PathProgramCache]: Analyzing trace with hash 922238955, now seen corresponding path program 16 times [2020-08-21 20:34:59,786 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:34:59,786 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1500857150] [2020-08-21 20:34:59,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:34:59,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:35:00,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:35:00,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:35:00,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2020-08-21 20:35:00,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:35:00,083 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:35:00,083 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1500857150] [2020-08-21 20:35:00,083 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:35:00,084 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 20:35:00,084 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1340632099] [2020-08-21 20:35:00,084 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 20:35:00,085 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:35:00,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 20:35:00,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-21 20:35:00,085 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 20 states. [2020-08-21 20:35:00,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:35:00,191 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2020-08-21 20:35:00,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 20:35:00,191 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 50 [2020-08-21 20:35:00,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:35:00,192 INFO L225 Difference]: With dead ends: 66 [2020-08-21 20:35:00,192 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 20:35:00,193 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-21 20:35:00,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 20:35:00,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-21 20:35:00,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 20:35:00,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2020-08-21 20:35:00,201 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 50 [2020-08-21 20:35:00,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:35:00,201 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2020-08-21 20:35:00,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 20:35:00,204 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2020-08-21 20:35:00,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 20:35:00,205 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:35:00,205 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:35:00,205 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 20:35:00,205 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:35:00,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:35:00,206 INFO L82 PathProgramCache]: Analyzing trace with hash -645514611, now seen corresponding path program 17 times [2020-08-21 20:35:00,206 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:35:00,206 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1702789857] [2020-08-21 20:35:00,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:35:00,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:35:00,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:35:00,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:35:00,453 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2020-08-21 20:35:00,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:35:00,459 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:35:00,460 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1702789857] [2020-08-21 20:35:00,460 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:35:00,460 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 20:35:00,461 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526662357] [2020-08-21 20:35:00,462 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 20:35:00,462 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:35:00,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 20:35:00,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-21 20:35:00,463 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand 21 states. [2020-08-21 20:35:00,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:35:00,600 INFO L93 Difference]: Finished difference Result 68 states and 70 transitions. [2020-08-21 20:35:00,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 20:35:00,600 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 52 [2020-08-21 20:35:00,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:35:00,602 INFO L225 Difference]: With dead ends: 68 [2020-08-21 20:35:00,602 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 20:35:00,605 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-21 20:35:00,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 20:35:00,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-21 20:35:00,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 20:35:00,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2020-08-21 20:35:00,610 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 52 [2020-08-21 20:35:00,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:35:00,610 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2020-08-21 20:35:00,610 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 20:35:00,610 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2020-08-21 20:35:00,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 20:35:00,611 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:35:00,611 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:35:00,611 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 20:35:00,611 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:35:00,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:35:00,612 INFO L82 PathProgramCache]: Analyzing trace with hash 276829359, now seen corresponding path program 18 times [2020-08-21 20:35:00,612 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:35:00,612 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [414942945] [2020-08-21 20:35:00,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:35:00,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:35:00,902 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:35:00,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:35:00,905 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2020-08-21 20:35:00,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:35:00,911 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:35:00,911 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [414942945] [2020-08-21 20:35:00,911 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:35:00,912 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 20:35:00,912 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189343310] [2020-08-21 20:35:00,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 20:35:00,912 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:35:00,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 20:35:00,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-21 20:35:00,913 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 22 states. [2020-08-21 20:35:01,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:35:01,004 INFO L93 Difference]: Finished difference Result 70 states and 72 transitions. [2020-08-21 20:35:01,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 20:35:01,004 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 54 [2020-08-21 20:35:01,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:35:01,005 INFO L225 Difference]: With dead ends: 70 [2020-08-21 20:35:01,005 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 20:35:01,006 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-21 20:35:01,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 20:35:01,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-21 20:35:01,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 20:35:01,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-08-21 20:35:01,011 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 54 [2020-08-21 20:35:01,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:35:01,012 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-08-21 20:35:01,012 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 20:35:01,012 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-08-21 20:35:01,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 20:35:01,012 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:35:01,013 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:35:01,014 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 20:35:01,014 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:35:01,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:35:01,014 INFO L82 PathProgramCache]: Analyzing trace with hash 1886121553, now seen corresponding path program 19 times [2020-08-21 20:35:01,015 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:35:01,015 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [681091898] [2020-08-21 20:35:01,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:35:01,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:35:01,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:35:01,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:35:01,308 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2020-08-21 20:35:01,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:35:01,314 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:35:01,315 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [681091898] [2020-08-21 20:35:01,315 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:35:01,315 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 20:35:01,315 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107411964] [2020-08-21 20:35:01,317 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 20:35:01,317 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:35:01,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 20:35:01,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-21 20:35:01,318 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 23 states. [2020-08-21 20:35:01,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:35:01,448 INFO L93 Difference]: Finished difference Result 71 states and 73 transitions. [2020-08-21 20:35:01,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 20:35:01,448 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 56 [2020-08-21 20:35:01,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:35:01,449 INFO L225 Difference]: With dead ends: 71 [2020-08-21 20:35:01,449 INFO L226 Difference]: Without dead ends: 59 [2020-08-21 20:35:01,450 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-21 20:35:01,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-21 20:35:01,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-21 20:35:01,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 20:35:01,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2020-08-21 20:35:01,456 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 56 [2020-08-21 20:35:01,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:35:01,456 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2020-08-21 20:35:01,456 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 20:35:01,456 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2020-08-21 20:35:01,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 20:35:01,461 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:35:01,461 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:35:01,462 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 20:35:01,463 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:35:01,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:35:01,464 INFO L82 PathProgramCache]: Analyzing trace with hash -2067273869, now seen corresponding path program 20 times [2020-08-21 20:35:01,464 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:35:01,464 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [322750453] [2020-08-21 20:35:01,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:35:01,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 20:35:01,588 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 20:35:01,588 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 20:35:01,594 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 20:35:01,628 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 08:35:01 BoogieIcfgContainer [2020-08-21 20:35:01,628 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 20:35:01,639 INFO L168 Benchmark]: Toolchain (without parser) took 7245.99 ms. Allocated memory was 141.0 MB in the beginning and 296.7 MB in the end (delta: 155.7 MB). Free memory was 104.0 MB in the beginning and 135.6 MB in the end (delta: -31.6 MB). Peak memory consumption was 124.1 MB. Max. memory is 7.1 GB. [2020-08-21 20:35:01,642 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 141.0 MB. Free memory was 122.6 MB in the beginning and 122.1 MB in the end (delta: 419.7 kB). Peak memory consumption was 419.7 kB. Max. memory is 7.1 GB. [2020-08-21 20:35:01,643 INFO L168 Benchmark]: CACSL2BoogieTranslator took 349.11 ms. Allocated memory was 141.0 MB in the beginning and 203.9 MB in the end (delta: 62.9 MB). Free memory was 104.0 MB in the beginning and 182.6 MB in the end (delta: -78.6 MB). Peak memory consumption was 22.4 MB. Max. memory is 7.1 GB. [2020-08-21 20:35:01,645 INFO L168 Benchmark]: Boogie Preprocessor took 34.43 ms. Allocated memory is still 203.9 MB. Free memory was 182.6 MB in the beginning and 180.3 MB in the end (delta: 2.3 MB). Peak memory consumption was 2.3 MB. Max. memory is 7.1 GB. [2020-08-21 20:35:01,646 INFO L168 Benchmark]: RCFGBuilder took 374.76 ms. Allocated memory is still 203.9 MB. Free memory was 180.3 MB in the beginning and 164.6 MB in the end (delta: 15.8 MB). Peak memory consumption was 15.8 MB. Max. memory is 7.1 GB. [2020-08-21 20:35:01,646 INFO L168 Benchmark]: TraceAbstraction took 6473.50 ms. Allocated memory was 203.9 MB in the beginning and 296.7 MB in the end (delta: 92.8 MB). Free memory was 164.6 MB in the beginning and 135.6 MB in the end (delta: 29.0 MB). Peak memory consumption was 121.8 MB. Max. memory is 7.1 GB. [2020-08-21 20:35:01,650 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 141.0 MB. Free memory was 122.6 MB in the beginning and 122.1 MB in the end (delta: 419.7 kB). Peak memory consumption was 419.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 349.11 ms. Allocated memory was 141.0 MB in the beginning and 203.9 MB in the end (delta: 62.9 MB). Free memory was 104.0 MB in the beginning and 182.6 MB in the end (delta: -78.6 MB). Peak memory consumption was 22.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 34.43 ms. Allocated memory is still 203.9 MB. Free memory was 182.6 MB in the beginning and 180.3 MB in the end (delta: 2.3 MB). Peak memory consumption was 2.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 374.76 ms. Allocated memory is still 203.9 MB. Free memory was 180.3 MB in the beginning and 164.6 MB in the end (delta: 15.8 MB). Peak memory consumption was 15.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6473.50 ms. Allocated memory was 203.9 MB in the beginning and 296.7 MB in the end (delta: 92.8 MB). Free memory was 164.6 MB in the beginning and 135.6 MB in the end (delta: 29.0 MB). Peak memory consumption was 121.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 37]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L15] struct dummy ad1[20], *ad2; [L16] int i, j, *pa; [L17] j=0 [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND FALSE !(j<20) [L21] i = __VERIFIER_nondet_int() [L22] COND TRUE i >= 0 && i < 10 [L23] ad2 = ad1 [L24] ad1[i].a = i [L25] pa = &ad1[i].a [L26] EXPR ad2[i].a [L26] i = ad2[i].a + 10 [L27] EXPR \read(*pa) [L27] COND FALSE !(i < *pa) [L30] CALL, EXPR check(ad1, i) [L10] EXPR ad1[b].a [L10] return ad1[b].a == b; [L30] RET, EXPR check(ad1, i) [L30] COND TRUE !check(ad1, i) [L37] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 6.3s, OverallIterations: 22, TraceHistogramMax: 20, AutomataDifference: 2.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 365 SDtfs, 252 SDslu, 1934 SDs, 0 SdLazy, 1339 SolverSat, 72 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 336 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 231 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 2.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=59occurred in iteration=21, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 21 MinimizatonAttempts, 19 StatesRemovedByMinimization, 19 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 3.1s InterpolantComputationTime, 815 NumberOfCodeBlocks, 815 NumberOfCodeBlocksAsserted, 22 NumberOfCheckSat, 736 ConstructedInterpolants, 0 QuantifiedInterpolants, 69580 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 21 InterpolantComputations, 2 PerfectInterpolantSequences, 0/2470 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...