/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 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-86f66a4 [2020-07-07 11:10:54,133 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-07 11:10:54,135 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-07 11:10:54,151 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-07 11:10:54,151 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-07 11:10:54,153 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-07 11:10:54,155 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-07 11:10:54,165 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-07 11:10:54,167 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-07 11:10:54,168 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-07 11:10:54,169 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-07 11:10:54,171 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-07 11:10:54,171 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-07 11:10:54,172 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-07 11:10:54,175 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-07 11:10:54,177 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-07 11:10:54,179 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-07 11:10:54,181 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-07 11:10:54,183 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-07 11:10:54,188 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-07 11:10:54,191 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-07 11:10:54,192 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-07 11:10:54,193 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-07 11:10:54,195 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-07 11:10:54,197 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-07 11:10:54,210 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-07 11:10:54,210 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-07 11:10:54,212 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-07 11:10:54,212 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-07 11:10:54,249 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-07 11:10:54,250 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-07 11:10:54,251 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-07 11:10:54,253 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-07 11:10:54,253 INFO L138 SettingsManager]: * Use SBE=true [2020-07-07 11:10:54,254 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-07 11:10:54,254 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-07 11:10:54,254 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-07 11:10:54,254 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-07 11:10:54,254 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-07 11:10:54,255 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-07 11:10:54,255 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-07 11:10:54,255 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-07 11:10:54,255 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-07 11:10:54,255 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-07 11:10:54,255 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-07 11:10:54,256 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-07 11:10:54,256 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-07 11:10:54,256 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-07 11:10:54,256 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-07 11:10:54,257 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-07 11:10:54,257 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-07 11:10:54,257 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-07 11:10:54,257 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-07 11:10:54,258 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-07 11:10:54,258 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-07 11:10:54,258 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-07 11:10:54,258 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-07 11:10:54,258 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-07 11:10:54,259 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-07-07 11:10:54,541 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-07 11:10:54,559 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-07 11:10:54,562 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-07 11:10:54,564 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-07 11:10:54,564 INFO L275 PluginConnector]: CDTParser initialized [2020-07-07 11:10:54,565 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c [2020-07-07 11:10:54,624 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b066a969b/9c4c44f2cfee4598927bacdbaaee2ba2/FLAG8e31a6ec4 [2020-07-07 11:10:55,039 INFO L306 CDTParser]: Found 1 translation units. [2020-07-07 11:10:55,040 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c [2020-07-07 11:10:55,047 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b066a969b/9c4c44f2cfee4598927bacdbaaee2ba2/FLAG8e31a6ec4 [2020-07-07 11:10:55,382 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b066a969b/9c4c44f2cfee4598927bacdbaaee2ba2 [2020-07-07 11:10:55,392 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-07 11:10:55,394 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-07 11:10:55,395 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-07 11:10:55,397 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-07 11:10:55,400 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-07 11:10:55,401 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.07 11:10:55" (1/1) ... [2020-07-07 11:10:55,404 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@118c986e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:10:55, skipping insertion in model container [2020-07-07 11:10:55,404 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.07 11:10:55" (1/1) ... [2020-07-07 11:10:55,412 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-07 11:10:55,428 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-07 11:10:55,580 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-07 11:10:55,584 INFO L203 MainTranslator]: Completed pre-run [2020-07-07 11:10:55,599 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-07 11:10:55,613 INFO L208 MainTranslator]: Completed translation [2020-07-07 11:10:55,613 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:10:55 WrapperNode [2020-07-07 11:10:55,613 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-07 11:10:55,614 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-07 11:10:55,614 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-07 11:10:55,614 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-07 11:10:55,624 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:10:55" (1/1) ... [2020-07-07 11:10:55,624 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:10:55" (1/1) ... [2020-07-07 11:10:55,629 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:10:55" (1/1) ... [2020-07-07 11:10:55,629 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:10:55" (1/1) ... [2020-07-07 11:10:55,718 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:10:55" (1/1) ... [2020-07-07 11:10:55,721 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:10:55" (1/1) ... [2020-07-07 11:10:55,723 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:10:55" (1/1) ... [2020-07-07 11:10:55,726 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-07 11:10:55,726 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-07 11:10:55,727 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-07 11:10:55,727 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-07 11:10:55,728 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:10:55" (1/1) ... No working directory specified, using /storage/repos/ultimate/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 [2020-07-07 11:10:55,794 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-07 11:10:55,794 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-07 11:10:55,794 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-07 11:10:55,794 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-07 11:10:55,794 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-07 11:10:55,795 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-07 11:10:55,795 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-07 11:10:55,795 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-07 11:10:55,795 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-07 11:10:55,795 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-07 11:10:55,795 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-07 11:10:55,795 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-07 11:10:55,989 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-07 11:10:55,989 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-07 11:10:55,993 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.07 11:10:55 BoogieIcfgContainer [2020-07-07 11:10:55,993 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-07 11:10:55,994 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-07 11:10:55,995 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-07 11:10:55,998 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-07 11:10:55,998 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.07 11:10:55" (1/3) ... [2020-07-07 11:10:55,999 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57bdb543 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.07 11:10:55, skipping insertion in model container [2020-07-07 11:10:56,000 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:10:55" (2/3) ... [2020-07-07 11:10:56,000 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57bdb543 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.07 11:10:56, skipping insertion in model container [2020-07-07 11:10:56,000 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.07 11:10:55" (3/3) ... [2020-07-07 11:10:56,002 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_5-2.c [2020-07-07 11:10:56,016 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-07-07 11:10:56,025 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-07 11:10:56,044 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-07 11:10:56,086 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-07 11:10:56,086 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-07 11:10:56,087 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-07-07 11:10:56,088 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-07 11:10:56,088 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-07 11:10:56,088 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-07 11:10:56,089 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-07 11:10:56,089 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-07 11:10:56,135 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-07 11:10:56,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-07 11:10:56,147 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 11:10:56,148 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 11:10:56,148 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 11:10:56,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 11:10:56,153 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-07 11:10:56,160 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 11:10:56,160 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1026141972] [2020-07-07 11:10:56,161 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 11:10:56,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:56,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:56,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:56,359 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-07 11:10:56,360 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1026141972] [2020-07-07 11:10:56,360 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 11:10:56,361 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-07 11:10:56,361 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054027999] [2020-07-07 11:10:56,366 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-07 11:10:56,366 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-07 11:10:56,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-07 11:10:56,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-07 11:10:56,379 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-07 11:10:56,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 11:10:56,481 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-07 11:10:56,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-07 11:10:56,482 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-07 11:10:56,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 11:10:56,492 INFO L225 Difference]: With dead ends: 44 [2020-07-07 11:10:56,492 INFO L226 Difference]: Without dead ends: 30 [2020-07-07 11:10:56,496 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-07 11:10:56,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-07 11:10:56,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-07 11:10:56,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-07 11:10:56,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-07 11:10:56,542 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-07 11:10:56,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 11:10:56,542 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-07 11:10:56,542 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-07 11:10:56,542 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-07 11:10:56,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-07 11:10:56,544 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 11:10:56,544 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 11:10:56,545 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-07 11:10:56,545 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 11:10:56,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 11:10:56,546 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-07 11:10:56,546 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 11:10:56,546 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [302912575] [2020-07-07 11:10:56,547 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 11:10:56,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:56,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:56,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:56,623 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-07 11:10:56,624 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [302912575] [2020-07-07 11:10:56,624 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 11:10:56,625 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-07 11:10:56,625 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285289598] [2020-07-07 11:10:56,627 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-07 11:10:56,627 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-07 11:10:56,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-07 11:10:56,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-07 11:10:56,628 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-07 11:10:56,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 11:10:56,690 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-07 11:10:56,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-07 11:10:56,691 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-07 11:10:56,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 11:10:56,693 INFO L225 Difference]: With dead ends: 36 [2020-07-07 11:10:56,693 INFO L226 Difference]: Without dead ends: 32 [2020-07-07 11:10:56,694 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-07 11:10:56,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-07 11:10:56,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-07 11:10:56,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-07 11:10:56,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-07 11:10:56,705 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-07 11:10:56,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 11:10:56,705 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-07 11:10:56,705 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-07 11:10:56,706 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-07 11:10:56,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-07 11:10:56,707 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 11:10:56,708 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 11:10:56,708 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-07-07 11:10:56,708 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 11:10:56,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 11:10:56,709 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-07 11:10:56,709 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 11:10:56,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [102807659] [2020-07-07 11:10:56,710 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 11:10:56,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:56,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:56,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:56,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:56,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:56,855 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-07 11:10:56,855 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [102807659] [2020-07-07 11:10:56,856 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1310620387] [2020-07-07 11:10:56,856 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-07 11:10:56,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:56,905 INFO L264 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-07 11:10:56,912 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2020-07-07 11:10:57,000 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-07 11:10:57,001 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-07 11:10:57,001 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-07 11:10:57,002 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [102845439] [2020-07-07 11:10:57,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-07 11:10:57,003 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-07 11:10:57,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-07 11:10:57,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-07-07 11:10:57,004 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-07 11:10:57,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 11:10:57,208 INFO L93 Difference]: Finished difference Result 58 states and 78 transitions. [2020-07-07 11:10:57,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-07 11:10:57,209 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-07 11:10:57,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 11:10:57,211 INFO L225 Difference]: With dead ends: 58 [2020-07-07 11:10:57,211 INFO L226 Difference]: Without dead ends: 34 [2020-07-07 11:10:57,212 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-07 11:10:57,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-07 11:10:57,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-07-07 11:10:57,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-07 11:10:57,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2020-07-07 11:10:57,221 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 26 [2020-07-07 11:10:57,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 11:10:57,222 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2020-07-07 11:10:57,222 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-07 11:10:57,222 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2020-07-07 11:10:57,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-07 11:10:57,224 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 11:10:57,224 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, 1, 1, 1, 1, 1] [2020-07-07 11:10:57,438 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-07-07 11:10:57,438 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 11:10:57,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 11:10:57,440 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-07 11:10:57,441 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 11:10:57,441 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [698465554] [2020-07-07 11:10:57,442 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 11:10:57,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:57,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:57,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:57,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:57,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:57,578 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-07 11:10:57,578 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [698465554] [2020-07-07 11:10:57,578 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [41850675] [2020-07-07 11:10:57,579 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-07 11:10:57,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:57,604 INFO L264 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-07 11:10:57,606 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2020-07-07 11:10:57,634 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-07 11:10:57,635 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-07 11:10:57,635 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 10 [2020-07-07 11:10:57,636 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876763575] [2020-07-07 11:10:57,636 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-07 11:10:57,636 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-07 11:10:57,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-07 11:10:57,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-07 11:10:57,637 INFO L87 Difference]: Start difference. First operand 32 states and 39 transitions. Second operand 10 states. [2020-07-07 11:10:57,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 11:10:57,802 INFO L93 Difference]: Finished difference Result 54 states and 74 transitions. [2020-07-07 11:10:57,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-07 11:10:57,803 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-07 11:10:57,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 11:10:57,807 INFO L225 Difference]: With dead ends: 54 [2020-07-07 11:10:57,807 INFO L226 Difference]: Without dead ends: 50 [2020-07-07 11:10:57,808 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-07 11:10:57,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-07 11:10:57,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 48. [2020-07-07 11:10:57,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-07 11:10:57,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 65 transitions. [2020-07-07 11:10:57,821 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 65 transitions. Word has length 27 [2020-07-07 11:10:57,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 11:10:57,821 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 65 transitions. [2020-07-07 11:10:57,821 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-07 11:10:57,821 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 65 transitions. [2020-07-07 11:10:57,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-07 11:10:57,824 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 11:10:57,824 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 11:10:58,039 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-07 11:10:58,040 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 11:10:58,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 11:10:58,041 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-07 11:10:58,041 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 11:10:58,041 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [909636930] [2020-07-07 11:10:58,042 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 11:10:58,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:58,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:58,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:58,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:58,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:58,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:58,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:58,128 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-07 11:10:58,129 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [909636930] [2020-07-07 11:10:58,129 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [821640943] [2020-07-07 11:10:58,129 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-07 11:10:58,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:58,161 INFO L264 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-07 11:10:58,164 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2020-07-07 11:10:58,240 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-07 11:10:58,241 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-07 11:10:58,241 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8] total 11 [2020-07-07 11:10:58,241 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492493861] [2020-07-07 11:10:58,242 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-07 11:10:58,242 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-07 11:10:58,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-07 11:10:58,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2020-07-07 11:10:58,243 INFO L87 Difference]: Start difference. First operand 48 states and 65 transitions. Second operand 11 states. [2020-07-07 11:10:58,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 11:10:58,533 INFO L93 Difference]: Finished difference Result 108 states and 170 transitions. [2020-07-07 11:10:58,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-07 11:10:58,534 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-07 11:10:58,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 11:10:58,536 INFO L225 Difference]: With dead ends: 108 [2020-07-07 11:10:58,536 INFO L226 Difference]: Without dead ends: 66 [2020-07-07 11:10:58,538 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2020-07-07 11:10:58,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-07-07 11:10:58,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2020-07-07 11:10:58,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-07 11:10:58,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 95 transitions. [2020-07-07 11:10:58,552 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 95 transitions. Word has length 39 [2020-07-07 11:10:58,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 11:10:58,553 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 95 transitions. [2020-07-07 11:10:58,553 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-07 11:10:58,553 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 95 transitions. [2020-07-07 11:10:58,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-07 11:10:58,555 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 11:10:58,556 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 11:10:58,771 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-07 11:10:58,772 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 11:10:58,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 11:10:58,772 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-07 11:10:58,773 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 11:10:58,773 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [120479543] [2020-07-07 11:10:58,774 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 11:10:58,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:58,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:58,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:58,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:58,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:58,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:58,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:58,931 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-07 11:10:58,932 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [120479543] [2020-07-07 11:10:58,932 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [269746270] [2020-07-07 11:10:58,932 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-07 11:10:58,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:58,960 INFO L264 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-07 11:10:58,963 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2020-07-07 11:10:59,027 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-07 11:10:59,028 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-07 11:10:59,028 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 14 [2020-07-07 11:10:59,028 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169256164] [2020-07-07 11:10:59,029 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-07 11:10:59,029 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-07 11:10:59,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-07 11:10:59,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2020-07-07 11:10:59,030 INFO L87 Difference]: Start difference. First operand 66 states and 95 transitions. Second operand 14 states. [2020-07-07 11:10:59,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 11:10:59,410 INFO L93 Difference]: Finished difference Result 180 states and 324 transitions. [2020-07-07 11:10:59,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-07 11:10:59,411 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 40 [2020-07-07 11:10:59,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 11:10:59,415 INFO L225 Difference]: With dead ends: 180 [2020-07-07 11:10:59,415 INFO L226 Difference]: Without dead ends: 120 [2020-07-07 11:10:59,417 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=376, Unknown=0, NotChecked=0, Total=462 [2020-07-07 11:10:59,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-07-07 11:10:59,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 106. [2020-07-07 11:10:59,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-07-07 11:10:59,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 169 transitions. [2020-07-07 11:10:59,440 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 169 transitions. Word has length 40 [2020-07-07 11:10:59,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 11:10:59,441 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 169 transitions. [2020-07-07 11:10:59,441 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-07 11:10:59,441 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 169 transitions. [2020-07-07 11:10:59,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-07 11:10:59,445 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 11:10:59,445 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 11:10:59,659 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-07 11:10:59,659 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 11:10:59,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 11:10:59,660 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-07 11:10:59,661 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 11:10:59,661 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570797806] [2020-07-07 11:10:59,661 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 11:10:59,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:59,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:59,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:59,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:59,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:59,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:59,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:59,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:59,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:10:59,829 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-07-07 11:10:59,829 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [570797806] [2020-07-07 11:10:59,830 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1179293491] [2020-07-07 11:10:59,830 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2020-07-07 11:10:59,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-07 11:10:59,863 INFO L264 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-07 11:10:59,866 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2020-07-07 11:10:59,949 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-07-07 11:10:59,949 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-07 11:10:59,950 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 15 [2020-07-07 11:10:59,950 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424665205] [2020-07-07 11:10:59,951 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-07 11:10:59,951 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-07 11:10:59,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-07 11:10:59,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2020-07-07 11:10:59,952 INFO L87 Difference]: Start difference. First operand 106 states and 169 transitions. Second operand 15 states. [2020-07-07 11:11:00,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 11:11:00,471 INFO L93 Difference]: Finished difference Result 258 states and 498 transitions. [2020-07-07 11:11:00,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-07 11:11:00,471 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 54 [2020-07-07 11:11:00,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 11:11:00,475 INFO L225 Difference]: With dead ends: 258 [2020-07-07 11:11:00,475 INFO L226 Difference]: Without dead ends: 158 [2020-07-07 11:11:00,476 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=102, Invalid=450, Unknown=0, NotChecked=0, Total=552 [2020-07-07 11:11:00,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2020-07-07 11:11:00,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 112. [2020-07-07 11:11:00,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-07-07 11:11:00,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 180 transitions. [2020-07-07 11:11:00,519 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 180 transitions. Word has length 54 [2020-07-07 11:11:00,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 11:11:00,521 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 180 transitions. [2020-07-07 11:11:00,522 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-07 11:11:00,522 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 180 transitions. [2020-07-07 11:11:00,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-07 11:11:00,529 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 11:11:00,529 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 11:11:00,731 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-07-07 11:11:00,732 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 11:11:00,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 11:11:00,732 INFO L82 PathProgramCache]: Analyzing trace with hash 1229769625, now seen corresponding path program 1 times [2020-07-07 11:11:00,733 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 11:11:00,733 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1433583053] [2020-07-07 11:11:00,734 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 11:11:00,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:00,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:00,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:00,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:00,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:00,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:00,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:00,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:00,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:00,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:00,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:00,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:00,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:00,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:00,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:00,989 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 40 proven. 57 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2020-07-07 11:11:00,989 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1433583053] [2020-07-07 11:11:00,990 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1337755279] [2020-07-07 11:11:00,990 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-07 11:11:01,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:01,033 INFO L264 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-07 11:11:01,037 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2020-07-07 11:11:01,128 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 32 proven. 43 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2020-07-07 11:11:01,129 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-07 11:11:01,129 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 16 [2020-07-07 11:11:01,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2022096793] [2020-07-07 11:11:01,134 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-07 11:11:01,135 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-07 11:11:01,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-07 11:11:01,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2020-07-07 11:11:01,135 INFO L87 Difference]: Start difference. First operand 112 states and 180 transitions. Second operand 16 states. [2020-07-07 11:11:01,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 11:11:01,592 INFO L93 Difference]: Finished difference Result 244 states and 474 transitions. [2020-07-07 11:11:01,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-07 11:11:01,592 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 96 [2020-07-07 11:11:01,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 11:11:01,595 INFO L225 Difference]: With dead ends: 244 [2020-07-07 11:11:01,595 INFO L226 Difference]: Without dead ends: 123 [2020-07-07 11:11:01,597 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=91, Invalid=415, Unknown=0, NotChecked=0, Total=506 [2020-07-07 11:11:01,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-07 11:11:01,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 101. [2020-07-07 11:11:01,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-07-07 11:11:01,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 154 transitions. [2020-07-07 11:11:01,614 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 154 transitions. Word has length 96 [2020-07-07 11:11:01,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 11:11:01,614 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 154 transitions. [2020-07-07 11:11:01,614 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-07 11:11:01,614 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 154 transitions. [2020-07-07 11:11:01,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2020-07-07 11:11:01,617 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 11:11:01,617 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 7, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 11:11:01,832 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-07 11:11:01,833 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 11:11:01,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 11:11:01,834 INFO L82 PathProgramCache]: Analyzing trace with hash 465900404, now seen corresponding path program 1 times [2020-07-07 11:11:01,834 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 11:11:01,835 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1288374872] [2020-07-07 11:11:01,835 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 11:11:01,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:01,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:01,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:01,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:01,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:01,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:01,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:01,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:01,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:02,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:02,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:02,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:02,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:02,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:02,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:02,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:02,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:02,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:02,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:02,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:02,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:02,120 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 63 proven. 163 refuted. 0 times theorem prover too weak. 228 trivial. 0 not checked. [2020-07-07 11:11:02,121 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1288374872] [2020-07-07 11:11:02,121 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1047899379] [2020-07-07 11:11:02,121 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-07 11:11:02,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:02,219 INFO L264 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-07 11:11:02,239 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2020-07-07 11:11:02,371 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 60 proven. 100 refuted. 0 times theorem prover too weak. 294 trivial. 0 not checked. [2020-07-07 11:11:02,373 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-07 11:11:02,373 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 9] total 20 [2020-07-07 11:11:02,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747404624] [2020-07-07 11:11:02,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-07 11:11:02,376 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-07 11:11:02,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-07 11:11:02,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2020-07-07 11:11:02,377 INFO L87 Difference]: Start difference. First operand 101 states and 154 transitions. Second operand 20 states. [2020-07-07 11:11:02,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 11:11:02,995 INFO L93 Difference]: Finished difference Result 249 states and 477 transitions. [2020-07-07 11:11:02,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-07 11:11:02,996 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 138 [2020-07-07 11:11:02,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 11:11:02,999 INFO L225 Difference]: With dead ends: 249 [2020-07-07 11:11:02,999 INFO L226 Difference]: Without dead ends: 114 [2020-07-07 11:11:03,002 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 176 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=140, Invalid=790, Unknown=0, NotChecked=0, Total=930 [2020-07-07 11:11:03,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-07-07 11:11:03,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 101. [2020-07-07 11:11:03,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-07-07 11:11:03,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 143 transitions. [2020-07-07 11:11:03,031 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 143 transitions. Word has length 138 [2020-07-07 11:11:03,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 11:11:03,033 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 143 transitions. [2020-07-07 11:11:03,033 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-07 11:11:03,033 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 143 transitions. [2020-07-07 11:11:03,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-07-07 11:11:03,038 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 11:11:03,038 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 8, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 11:11:03,251 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-07 11:11:03,252 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 11:11:03,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 11:11:03,252 INFO L82 PathProgramCache]: Analyzing trace with hash 2011292190, now seen corresponding path program 2 times [2020-07-07 11:11:03,253 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 11:11:03,253 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1409638782] [2020-07-07 11:11:03,253 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 11:11:03,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:03,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:03,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:03,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:03,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:03,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:03,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:03,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:03,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:03,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:03,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:03,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:03,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:03,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:03,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:03,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:03,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:03,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:03,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:03,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:03,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:03,685 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 92 proven. 147 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2020-07-07 11:11:03,686 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1409638782] [2020-07-07 11:11:03,686 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [952417482] [2020-07-07 11:11:03,686 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-07 11:11:03,740 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-07-07 11:11:03,740 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-07 11:11:03,742 INFO L264 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-07 11:11:03,746 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2020-07-07 11:11:03,830 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 131 proven. 51 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2020-07-07 11:11:03,831 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-07 11:11:03,831 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 10] total 24 [2020-07-07 11:11:03,831 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [539704637] [2020-07-07 11:11:03,832 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-07 11:11:03,832 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-07 11:11:03,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-07 11:11:03,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2020-07-07 11:11:03,833 INFO L87 Difference]: Start difference. First operand 101 states and 143 transitions. Second operand 24 states. [2020-07-07 11:11:04,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 11:11:04,486 INFO L93 Difference]: Finished difference Result 233 states and 370 transitions. [2020-07-07 11:11:04,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-07 11:11:04,487 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 136 [2020-07-07 11:11:04,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 11:11:04,489 INFO L225 Difference]: With dead ends: 233 [2020-07-07 11:11:04,490 INFO L226 Difference]: Without dead ends: 135 [2020-07-07 11:11:04,491 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 337 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=215, Invalid=1191, Unknown=0, NotChecked=0, Total=1406 [2020-07-07 11:11:04,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2020-07-07 11:11:04,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 111. [2020-07-07 11:11:04,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2020-07-07 11:11:04,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 153 transitions. [2020-07-07 11:11:04,504 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 153 transitions. Word has length 136 [2020-07-07 11:11:04,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 11:11:04,504 INFO L479 AbstractCegarLoop]: Abstraction has 111 states and 153 transitions. [2020-07-07 11:11:04,505 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-07 11:11:04,505 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 153 transitions. [2020-07-07 11:11:04,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2020-07-07 11:11:04,506 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 11:11:04,507 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 11:11:04,720 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2020-07-07 11:11:04,721 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 11:11:04,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 11:11:04,722 INFO L82 PathProgramCache]: Analyzing trace with hash -46122593, now seen corresponding path program 3 times [2020-07-07 11:11:04,723 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 11:11:04,723 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [224751575] [2020-07-07 11:11:04,724 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 11:11:04,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:04,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:04,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:04,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:04,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:04,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:04,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:04,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:04,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:04,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:04,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:04,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:04,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:04,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:04,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:11:04,970 INFO L134 CoverageAnalysis]: Checked inductivity of 188 backedges. 60 proven. 49 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2020-07-07 11:11:04,971 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [224751575] [2020-07-07 11:11:04,972 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [50613730] [2020-07-07 11:11:04,972 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-07 11:11:05,026 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-07-07 11:11:05,026 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-07 11:11:05,027 INFO L264 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-07 11:11:05,059 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2020-07-07 11:11:05,134 INFO L134 CoverageAnalysis]: Checked inductivity of 188 backedges. 58 proven. 13 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2020-07-07 11:11:05,135 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-07 11:11:05,135 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 8] total 20 [2020-07-07 11:11:05,136 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217256124] [2020-07-07 11:11:05,136 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-07 11:11:05,137 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-07 11:11:05,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-07 11:11:05,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=319, Unknown=0, NotChecked=0, Total=380 [2020-07-07 11:11:05,137 INFO L87 Difference]: Start difference. First operand 111 states and 153 transitions. Second operand 20 states. [2020-07-07 11:11:05,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 11:11:05,510 INFO L93 Difference]: Finished difference Result 224 states and 317 transitions. [2020-07-07 11:11:05,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-07 11:11:05,511 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 95 [2020-07-07 11:11:05,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 11:11:05,513 INFO L225 Difference]: With dead ends: 224 [2020-07-07 11:11:05,514 INFO L226 Difference]: Without dead ends: 126 [2020-07-07 11:11:05,515 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 143 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=114, Invalid=588, Unknown=0, NotChecked=0, Total=702 [2020-07-07 11:11:05,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-07-07 11:11:05,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 114. [2020-07-07 11:11:05,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2020-07-07 11:11:05,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 152 transitions. [2020-07-07 11:11:05,526 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 152 transitions. Word has length 95 [2020-07-07 11:11:05,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 11:11:05,526 INFO L479 AbstractCegarLoop]: Abstraction has 114 states and 152 transitions. [2020-07-07 11:11:05,526 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-07 11:11:05,526 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 152 transitions. [2020-07-07 11:11:05,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-07 11:11:05,528 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 11:11:05,529 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 11:11:05,743 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-07 11:11:05,744 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 11:11:05,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 11:11:05,744 INFO L82 PathProgramCache]: Analyzing trace with hash -1540036056, now seen corresponding path program 4 times [2020-07-07 11:11:05,745 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 11:11:05,745 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1187448792] [2020-07-07 11:11:05,745 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 11:11:05,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-07 11:11:05,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-07 11:11:05,791 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-07-07 11:11:05,792 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-07 11:11:05,792 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-07-07 11:11:05,832 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.07 11:11:05 BoogieIcfgContainer [2020-07-07 11:11:05,832 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-07 11:11:05,834 INFO L168 Benchmark]: Toolchain (without parser) took 10440.52 ms. Allocated memory was 146.8 MB in the beginning and 316.1 MB in the end (delta: 169.3 MB). Free memory was 104.0 MB in the beginning and 179.0 MB in the end (delta: -75.0 MB). Peak memory consumption was 94.3 MB. Max. memory is 7.1 GB. [2020-07-07 11:11:05,835 INFO L168 Benchmark]: CDTParser took 0.49 ms. Allocated memory is still 146.8 MB. Free memory was 123.0 MB in the beginning and 122.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-07 11:11:05,835 INFO L168 Benchmark]: CACSL2BoogieTranslator took 218.94 ms. Allocated memory is still 146.8 MB. Free memory was 103.6 MB in the beginning and 94.1 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-07-07 11:11:05,841 INFO L168 Benchmark]: Boogie Preprocessor took 112.26 ms. Allocated memory was 146.8 MB in the beginning and 203.4 MB in the end (delta: 56.6 MB). Free memory was 94.1 MB in the beginning and 182.6 MB in the end (delta: -88.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-07-07 11:11:05,846 INFO L168 Benchmark]: RCFGBuilder took 266.97 ms. Allocated memory is still 203.4 MB. Free memory was 182.2 MB in the beginning and 169.4 MB in the end (delta: 12.9 MB). Peak memory consumption was 12.9 MB. Max. memory is 7.1 GB. [2020-07-07 11:11:05,847 INFO L168 Benchmark]: TraceAbstraction took 9837.52 ms. Allocated memory was 203.4 MB in the beginning and 316.1 MB in the end (delta: 112.7 MB). Free memory was 168.7 MB in the beginning and 179.0 MB in the end (delta: -10.3 MB). Peak memory consumption was 102.4 MB. Max. memory is 7.1 GB. [2020-07-07 11:11:05,852 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.49 ms. Allocated memory is still 146.8 MB. Free memory was 123.0 MB in the beginning and 122.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 218.94 ms. Allocated memory is still 146.8 MB. Free memory was 103.6 MB in the beginning and 94.1 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 112.26 ms. Allocated memory was 146.8 MB in the beginning and 203.4 MB in the end (delta: 56.6 MB). Free memory was 94.1 MB in the beginning and 182.6 MB in the end (delta: -88.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 266.97 ms. Allocated memory is still 203.4 MB. Free memory was 182.2 MB in the beginning and 169.4 MB in the end (delta: 12.9 MB). Peak memory consumption was 12.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 9837.52 ms. Allocated memory was 203.4 MB in the beginning and 316.1 MB in the end (delta: 112.7 MB). Free memory was 168.7 MB in the beginning and 179.0 MB in the end (delta: -10.3 MB). Peak memory consumption was 102.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 5; VAL [x=5] [L37] CALL, EXPR fibo1(x) VAL [\old(n)=5] [L8] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L10] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=4] [L18] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L20] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=4, fibo1(n-1)=2, n=4] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=5, fibo2(n-1)=3, n=5] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=5, fibo2(n-1)=3, fibo2(n-2)=2, n=5] [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) VAL [fibo1(x)=5, x=5] [L37] int result = fibo1(x); [L38] COND TRUE result == 5 VAL [result=5, x=5] [L39] __VERIFIER_error() VAL [result=5, x=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 9.7s, OverallIterations: 12, TraceHistogramMax: 10, AutomataDifference: 3.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 347 SDtfs, 559 SDslu, 2311 SDs, 0 SdLazy, 3297 SolverSat, 578 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1045 GetRequests, 846 SyntacticMatches, 0 SemanticMatches, 199 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 925 ImplicationChecksByTransitivity, 2.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=114occurred in iteration=11, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 11 MinimizatonAttempts, 137 StatesRemovedByMinimization, 9 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 2.7s InterpolantComputationTime, 1438 NumberOfCodeBlocks, 1397 NumberOfCodeBlocksAsserted, 25 NumberOfCheckSat, 1309 ConstructedInterpolants, 0 QuantifiedInterpolants, 215139 SizeOfPredicates, 38 NumberOfNonLiveVariables, 1373 ConjunctsInSsa, 76 ConjunctsInUnsatCore, 20 InterpolantComputations, 2 PerfectInterpolantSequences, 2027/2714 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...