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/array-industry-pattern/array_monotonic.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 21:47:33,060 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 21:47:33,062 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 21:47:33,074 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 21:47:33,074 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 21:47:33,075 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 21:47:33,077 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 21:47:33,079 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 21:47:33,081 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 21:47:33,082 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 21:47:33,083 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 21:47:33,084 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 21:47:33,084 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 21:47:33,088 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 21:47:33,089 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 21:47:33,090 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 21:47:33,094 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 21:47:33,095 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 21:47:33,098 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 21:47:33,102 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 21:47:33,104 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 21:47:33,105 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 21:47:33,106 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 21:47:33,110 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 21:47:33,113 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-14 21:47:33,121 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 21:47:33,122 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 21:47:33,123 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 21:47:33,124 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 21:47:33,127 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 21:47:33,127 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 21:47:33,128 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 21:47:33,128 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 21:47:33,128 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 21:47:33,130 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 21:47:33,134 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 21:47:33,135 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 [2019-10-14 21:47:33,155 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 21:47:33,155 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 21:47:33,157 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 21:47:33,157 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 21:47:33,157 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 21:47:33,158 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 21:47:33,158 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 21:47:33,158 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 21:47:33,158 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 21:47:33,158 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 21:47:33,159 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 21:47:33,159 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 21:47:33,160 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 21:47:33,160 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 21:47:33,160 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 21:47:33,160 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 21:47:33,161 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 21:47:33,161 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 21:47:33,161 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 21:47:33,161 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 21:47:33,162 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 21:47:33,162 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:47:33,162 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 21:47:33,162 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 21:47:33,162 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 21:47:33,163 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 21:47:33,163 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 21:47:33,163 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 21:47:33,163 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 21:47:33,504 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 21:47:33,525 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 21:47:33,529 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 21:47:33,531 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 21:47:33,531 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 21:47:33,532 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-industry-pattern/array_monotonic.i [2019-10-14 21:47:33,603 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/afdf2ff97/870d0bcab1fa4a379a6cee7696d00493/FLAG5e9fb229f [2019-10-14 21:47:33,990 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 21:47:33,991 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-industry-pattern/array_monotonic.i [2019-10-14 21:47:33,998 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/afdf2ff97/870d0bcab1fa4a379a6cee7696d00493/FLAG5e9fb229f [2019-10-14 21:47:34,379 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/afdf2ff97/870d0bcab1fa4a379a6cee7696d00493 [2019-10-14 21:47:34,387 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 21:47:34,388 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 21:47:34,389 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 21:47:34,390 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 21:47:34,393 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 21:47:34,394 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:47:34" (1/1) ... [2019-10-14 21:47:34,397 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@17644812 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:34, skipping insertion in model container [2019-10-14 21:47:34,397 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:47:34" (1/1) ... [2019-10-14 21:47:34,405 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 21:47:34,421 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 21:47:34,642 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:47:34,653 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 21:47:34,680 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:47:34,703 INFO L192 MainTranslator]: Completed translation [2019-10-14 21:47:34,703 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:34 WrapperNode [2019-10-14 21:47:34,704 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 21:47:34,705 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 21:47:34,705 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 21:47:34,706 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 21:47:34,823 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:34" (1/1) ... [2019-10-14 21:47:34,824 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:34" (1/1) ... [2019-10-14 21:47:34,833 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:34" (1/1) ... [2019-10-14 21:47:34,834 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:34" (1/1) ... [2019-10-14 21:47:34,851 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:34" (1/1) ... [2019-10-14 21:47:34,858 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:34" (1/1) ... [2019-10-14 21:47:34,859 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:34" (1/1) ... [2019-10-14 21:47:34,863 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 21:47:34,863 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 21:47:34,863 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 21:47:34,864 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 21:47:34,866 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:34" (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 [2019-10-14 21:47:34,935 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 21:47:34,935 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 21:47:34,936 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 21:47:34,936 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 21:47:34,936 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 21:47:34,936 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 21:47:34,936 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-14 21:47:34,937 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 21:47:34,937 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-14 21:47:34,937 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-14 21:47:34,938 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-14 21:47:34,938 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-14 21:47:34,939 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 21:47:34,939 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 21:47:35,145 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 21:47:35,145 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-10-14 21:47:35,147 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:47:35 BoogieIcfgContainer [2019-10-14 21:47:35,147 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 21:47:35,149 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 21:47:35,149 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 21:47:35,152 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 21:47:35,152 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 09:47:34" (1/3) ... [2019-10-14 21:47:35,153 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@364e4eb4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:47:35, skipping insertion in model container [2019-10-14 21:47:35,153 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:34" (2/3) ... [2019-10-14 21:47:35,154 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@364e4eb4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:47:35, skipping insertion in model container [2019-10-14 21:47:35,154 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:47:35" (3/3) ... [2019-10-14 21:47:35,155 INFO L109 eAbstractionObserver]: Analyzing ICFG array_monotonic.i [2019-10-14 21:47:35,166 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 21:47:35,174 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 21:47:35,186 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 21:47:35,217 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 21:47:35,217 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 21:47:35,218 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 21:47:35,218 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 21:47:35,218 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 21:47:35,218 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 21:47:35,218 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 21:47:35,219 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 21:47:35,241 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2019-10-14 21:47:35,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-14 21:47:35,248 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:35,250 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:35,253 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:35,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:35,260 INFO L82 PathProgramCache]: Analyzing trace with hash 547567586, now seen corresponding path program 1 times [2019-10-14 21:47:35,271 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:35,271 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [908423490] [2019-10-14 21:47:35,272 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:35,272 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:35,272 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:35,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:35,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:35,478 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:35,479 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [908423490] [2019-10-14 21:47:35,480 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:47:35,480 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-14 21:47:35,480 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1014546276] [2019-10-14 21:47:35,484 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 21:47:35,485 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:35,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 21:47:35,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:47:35,497 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 3 states. [2019-10-14 21:47:35,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:35,604 INFO L93 Difference]: Finished difference Result 43 states and 53 transitions. [2019-10-14 21:47:35,605 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 21:47:35,606 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2019-10-14 21:47:35,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:35,615 INFO L225 Difference]: With dead ends: 43 [2019-10-14 21:47:35,615 INFO L226 Difference]: Without dead ends: 21 [2019-10-14 21:47:35,619 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:47:35,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-10-14 21:47:35,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-10-14 21:47:35,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-10-14 21:47:35,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2019-10-14 21:47:35,667 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 14 [2019-10-14 21:47:35,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:35,667 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2019-10-14 21:47:35,667 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 21:47:35,668 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2019-10-14 21:47:35,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-14 21:47:35,669 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:35,669 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:35,669 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:35,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:35,670 INFO L82 PathProgramCache]: Analyzing trace with hash -1443476915, now seen corresponding path program 1 times [2019-10-14 21:47:35,670 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:35,671 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1094963174] [2019-10-14 21:47:35,671 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:35,671 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:35,671 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:35,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:35,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:35,744 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:35,745 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1094963174] [2019-10-14 21:47:35,745 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:47:35,745 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:47:35,746 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612632659] [2019-10-14 21:47:35,747 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:47:35,748 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:35,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:47:35,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:47:35,749 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand 4 states. [2019-10-14 21:47:35,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:35,852 INFO L93 Difference]: Finished difference Result 41 states and 49 transitions. [2019-10-14 21:47:35,852 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:47:35,852 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2019-10-14 21:47:35,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:35,855 INFO L225 Difference]: With dead ends: 41 [2019-10-14 21:47:35,856 INFO L226 Difference]: Without dead ends: 29 [2019-10-14 21:47:35,857 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:47:35,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-10-14 21:47:35,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 22. [2019-10-14 21:47:35,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-10-14 21:47:35,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2019-10-14 21:47:35,868 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 14 [2019-10-14 21:47:35,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:35,869 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2019-10-14 21:47:35,869 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:47:35,869 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2019-10-14 21:47:35,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-14 21:47:35,870 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:35,870 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:35,870 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:35,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:35,871 INFO L82 PathProgramCache]: Analyzing trace with hash -1901506806, now seen corresponding path program 1 times [2019-10-14 21:47:35,871 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:35,871 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1263524708] [2019-10-14 21:47:35,872 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:35,872 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:35,872 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:35,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:35,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:35,990 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:35,991 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1263524708] [2019-10-14 21:47:35,991 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1389634577] [2019-10-14 21:47:35,991 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 [2019-10-14 21:47:36,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:36,050 INFO L256 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 21:47:36,056 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:36,092 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:36,093 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:36,093 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-10-14 21:47:36,093 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826441966] [2019-10-14 21:47:36,094 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-14 21:47:36,094 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:36,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-14 21:47:36,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:47:36,095 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 6 states. [2019-10-14 21:47:36,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:36,211 INFO L93 Difference]: Finished difference Result 49 states and 60 transitions. [2019-10-14 21:47:36,211 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-14 21:47:36,211 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2019-10-14 21:47:36,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:36,213 INFO L225 Difference]: With dead ends: 49 [2019-10-14 21:47:36,213 INFO L226 Difference]: Without dead ends: 37 [2019-10-14 21:47:36,214 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:47:36,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-10-14 21:47:36,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 25. [2019-10-14 21:47:36,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-10-14 21:47:36,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2019-10-14 21:47:36,221 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 17 [2019-10-14 21:47:36,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:36,221 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2019-10-14 21:47:36,222 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-14 21:47:36,222 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2019-10-14 21:47:36,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-14 21:47:36,223 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:36,223 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:36,427 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:36,432 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:36,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:36,432 INFO L82 PathProgramCache]: Analyzing trace with hash -1958890195, now seen corresponding path program 2 times [2019-10-14 21:47:36,433 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:36,433 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1776021855] [2019-10-14 21:47:36,433 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:36,434 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:36,434 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:36,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:36,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:36,518 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:36,518 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1776021855] [2019-10-14 21:47:36,519 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1264665524] [2019-10-14 21:47:36,519 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 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 [2019-10-14 21:47:36,592 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:47:36,592 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:36,593 INFO L256 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 21:47:36,596 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:36,614 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:36,615 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:36,615 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-10-14 21:47:36,616 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [539685335] [2019-10-14 21:47:36,616 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-14 21:47:36,616 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:36,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-14 21:47:36,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:47:36,617 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 7 states. [2019-10-14 21:47:36,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:36,737 INFO L93 Difference]: Finished difference Result 57 states and 71 transitions. [2019-10-14 21:47:36,738 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 21:47:36,738 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 20 [2019-10-14 21:47:36,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:36,739 INFO L225 Difference]: With dead ends: 57 [2019-10-14 21:47:36,739 INFO L226 Difference]: Without dead ends: 45 [2019-10-14 21:47:36,740 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:47:36,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2019-10-14 21:47:36,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 28. [2019-10-14 21:47:36,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-14 21:47:36,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2019-10-14 21:47:36,747 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 20 [2019-10-14 21:47:36,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:36,747 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2019-10-14 21:47:36,748 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-14 21:47:36,748 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2019-10-14 21:47:36,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-10-14 21:47:36,749 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:36,749 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:36,951 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:36,952 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:36,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:36,953 INFO L82 PathProgramCache]: Analyzing trace with hash -2070448086, now seen corresponding path program 3 times [2019-10-14 21:47:36,954 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:36,954 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [585306552] [2019-10-14 21:47:36,955 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:36,955 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:36,955 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:36,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:37,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:37,086 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:37,087 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [585306552] [2019-10-14 21:47:37,088 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1831621492] [2019-10-14 21:47:37,088 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 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 [2019-10-14 21:47:37,152 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-10-14 21:47:37,152 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:37,153 INFO L256 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-14 21:47:37,155 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:37,172 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:37,172 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:37,172 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-10-14 21:47:37,173 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817395827] [2019-10-14 21:47:37,173 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-14 21:47:37,174 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:37,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-14 21:47:37,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:47:37,176 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand 8 states. [2019-10-14 21:47:37,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:37,289 INFO L93 Difference]: Finished difference Result 65 states and 82 transitions. [2019-10-14 21:47:37,290 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-14 21:47:37,290 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2019-10-14 21:47:37,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:37,291 INFO L225 Difference]: With dead ends: 65 [2019-10-14 21:47:37,291 INFO L226 Difference]: Without dead ends: 53 [2019-10-14 21:47:37,292 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:47:37,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-10-14 21:47:37,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 31. [2019-10-14 21:47:37,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-10-14 21:47:37,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2019-10-14 21:47:37,298 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 23 [2019-10-14 21:47:37,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:37,299 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2019-10-14 21:47:37,299 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-14 21:47:37,299 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2019-10-14 21:47:37,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-10-14 21:47:37,300 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:37,300 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:37,504 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:37,507 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:37,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:37,507 INFO L82 PathProgramCache]: Analyzing trace with hash -1186891763, now seen corresponding path program 4 times [2019-10-14 21:47:37,507 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:37,508 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1259006477] [2019-10-14 21:47:37,508 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:37,508 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:37,516 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:37,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:37,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:37,648 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:37,648 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1259006477] [2019-10-14 21:47:37,649 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [128213882] [2019-10-14 21:47:37,649 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST 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 [2019-10-14 21:47:37,686 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:47:37,686 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:37,687 INFO L256 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-14 21:47:37,689 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:37,709 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:37,709 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:37,710 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-10-14 21:47:37,710 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006630502] [2019-10-14 21:47:37,710 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 21:47:37,711 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:37,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 21:47:37,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:47:37,711 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand 9 states. [2019-10-14 21:47:37,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:37,855 INFO L93 Difference]: Finished difference Result 73 states and 93 transitions. [2019-10-14 21:47:37,855 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-14 21:47:37,856 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2019-10-14 21:47:37,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:37,857 INFO L225 Difference]: With dead ends: 73 [2019-10-14 21:47:37,857 INFO L226 Difference]: Without dead ends: 61 [2019-10-14 21:47:37,858 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:47:37,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-10-14 21:47:37,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 34. [2019-10-14 21:47:37,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-10-14 21:47:37,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2019-10-14 21:47:37,865 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 26 [2019-10-14 21:47:37,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:37,865 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2019-10-14 21:47:37,866 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 21:47:37,866 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2019-10-14 21:47:37,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-10-14 21:47:37,867 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:37,867 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:38,069 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:38,071 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:38,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:38,071 INFO L82 PathProgramCache]: Analyzing trace with hash 1279936842, now seen corresponding path program 5 times [2019-10-14 21:47:38,072 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:38,072 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1286257651] [2019-10-14 21:47:38,072 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:38,073 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:38,073 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:38,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:38,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:38,184 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:38,185 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1286257651] [2019-10-14 21:47:38,185 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1751546242] [2019-10-14 21:47:38,185 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 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) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:38,262 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-10-14 21:47:38,262 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:38,264 INFO L256 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 21:47:38,266 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:38,287 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:38,287 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:38,288 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-10-14 21:47:38,288 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950677876] [2019-10-14 21:47:38,289 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-14 21:47:38,289 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:38,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-14 21:47:38,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:47:38,290 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand 10 states. [2019-10-14 21:47:38,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:38,491 INFO L93 Difference]: Finished difference Result 81 states and 104 transitions. [2019-10-14 21:47:38,492 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-14 21:47:38,492 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 29 [2019-10-14 21:47:38,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:38,493 INFO L225 Difference]: With dead ends: 81 [2019-10-14 21:47:38,494 INFO L226 Difference]: Without dead ends: 69 [2019-10-14 21:47:38,494 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:47:38,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2019-10-14 21:47:38,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 37. [2019-10-14 21:47:38,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-10-14 21:47:38,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2019-10-14 21:47:38,503 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 29 [2019-10-14 21:47:38,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:38,503 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2019-10-14 21:47:38,504 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-14 21:47:38,504 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2019-10-14 21:47:38,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-10-14 21:47:38,505 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:38,505 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:38,707 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:38,707 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:38,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:38,708 INFO L82 PathProgramCache]: Analyzing trace with hash -614493459, now seen corresponding path program 6 times [2019-10-14 21:47:38,708 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:38,709 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1723663364] [2019-10-14 21:47:38,709 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:38,709 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:38,710 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:38,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:38,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:38,866 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:38,866 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1723663364] [2019-10-14 21:47:38,867 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1478033657] [2019-10-14 21:47:38,867 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE 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 [2019-10-14 21:47:38,943 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-10-14 21:47:38,944 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:38,945 INFO L256 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 21:47:38,947 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:38,967 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:38,967 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:38,968 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-10-14 21:47:38,968 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930152259] [2019-10-14 21:47:38,968 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-14 21:47:38,969 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:38,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-14 21:47:38,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:47:38,969 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand 11 states. [2019-10-14 21:47:39,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:39,120 INFO L93 Difference]: Finished difference Result 89 states and 115 transitions. [2019-10-14 21:47:39,120 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-14 21:47:39,121 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2019-10-14 21:47:39,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:39,122 INFO L225 Difference]: With dead ends: 89 [2019-10-14 21:47:39,122 INFO L226 Difference]: Without dead ends: 77 [2019-10-14 21:47:39,123 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:47:39,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2019-10-14 21:47:39,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 40. [2019-10-14 21:47:39,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-10-14 21:47:39,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 49 transitions. [2019-10-14 21:47:39,135 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 49 transitions. Word has length 32 [2019-10-14 21:47:39,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:39,138 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 49 transitions. [2019-10-14 21:47:39,138 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-14 21:47:39,138 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 49 transitions. [2019-10-14 21:47:39,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-10-14 21:47:39,139 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:39,139 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:39,340 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:39,340 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:39,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:39,341 INFO L82 PathProgramCache]: Analyzing trace with hash -1717321110, now seen corresponding path program 7 times [2019-10-14 21:47:39,341 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:39,341 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1240866345] [2019-10-14 21:47:39,341 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:39,341 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:39,342 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:39,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:39,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:39,449 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:39,450 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1240866345] [2019-10-14 21:47:39,450 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1983411894] [2019-10-14 21:47:39,450 INFO L92 rtionOrderModulation]: Changing assertion order to 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 [2019-10-14 21:47:39,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:39,502 INFO L256 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 21:47:39,510 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:39,525 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:39,525 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:39,526 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-10-14 21:47:39,526 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944412561] [2019-10-14 21:47:39,526 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-14 21:47:39,526 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:39,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-14 21:47:39,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:47:39,527 INFO L87 Difference]: Start difference. First operand 40 states and 49 transitions. Second operand 12 states. [2019-10-14 21:47:39,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:39,735 INFO L93 Difference]: Finished difference Result 97 states and 126 transitions. [2019-10-14 21:47:39,735 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-14 21:47:39,735 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 35 [2019-10-14 21:47:39,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:39,738 INFO L225 Difference]: With dead ends: 97 [2019-10-14 21:47:39,738 INFO L226 Difference]: Without dead ends: 85 [2019-10-14 21:47:39,739 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:47:39,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2019-10-14 21:47:39,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 43. [2019-10-14 21:47:39,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-10-14 21:47:39,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 53 transitions. [2019-10-14 21:47:39,748 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 53 transitions. Word has length 35 [2019-10-14 21:47:39,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:39,748 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 53 transitions. [2019-10-14 21:47:39,748 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-14 21:47:39,748 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 53 transitions. [2019-10-14 21:47:39,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-10-14 21:47:39,750 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:39,750 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:39,953 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:39,953 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:39,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:39,954 INFO L82 PathProgramCache]: Analyzing trace with hash 443942349, now seen corresponding path program 8 times [2019-10-14 21:47:39,955 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:39,955 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [245068423] [2019-10-14 21:47:39,956 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:39,956 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:39,956 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:39,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:40,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:40,114 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:40,115 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [245068423] [2019-10-14 21:47:40,115 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2095922669] [2019-10-14 21:47:40,115 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 [2019-10-14 21:47:40,161 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:47:40,161 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:40,162 INFO L256 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 21:47:40,164 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:40,199 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:40,199 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:40,200 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-10-14 21:47:40,200 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [18155367] [2019-10-14 21:47:40,200 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-14 21:47:40,201 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:40,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-14 21:47:40,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:47:40,201 INFO L87 Difference]: Start difference. First operand 43 states and 53 transitions. Second operand 13 states. [2019-10-14 21:47:40,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:40,409 INFO L93 Difference]: Finished difference Result 105 states and 137 transitions. [2019-10-14 21:47:40,409 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 21:47:40,409 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 38 [2019-10-14 21:47:40,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:40,410 INFO L225 Difference]: With dead ends: 105 [2019-10-14 21:47:40,411 INFO L226 Difference]: Without dead ends: 93 [2019-10-14 21:47:40,411 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:47:40,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2019-10-14 21:47:40,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 46. [2019-10-14 21:47:40,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-10-14 21:47:40,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 57 transitions. [2019-10-14 21:47:40,419 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 57 transitions. Word has length 38 [2019-10-14 21:47:40,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:40,419 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 57 transitions. [2019-10-14 21:47:40,419 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-14 21:47:40,419 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 57 transitions. [2019-10-14 21:47:40,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2019-10-14 21:47:40,420 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:40,420 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:40,628 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:40,629 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:40,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:40,630 INFO L82 PathProgramCache]: Analyzing trace with hash 788915082, now seen corresponding path program 9 times [2019-10-14 21:47:40,630 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:40,630 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [287888347] [2019-10-14 21:47:40,631 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:40,631 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:40,631 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:40,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:40,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:40,767 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:40,768 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [287888347] [2019-10-14 21:47:40,768 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [831125028] [2019-10-14 21:47:40,768 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 [2019-10-14 21:47:41,186 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2019-10-14 21:47:41,186 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:41,189 INFO L256 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-14 21:47:41,191 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:41,217 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:41,217 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:41,218 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2019-10-14 21:47:41,218 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163189790] [2019-10-14 21:47:41,218 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-14 21:47:41,219 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:41,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-14 21:47:41,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:47:41,219 INFO L87 Difference]: Start difference. First operand 46 states and 57 transitions. Second operand 14 states. [2019-10-14 21:47:41,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:41,441 INFO L93 Difference]: Finished difference Result 113 states and 148 transitions. [2019-10-14 21:47:41,442 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-14 21:47:41,442 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 41 [2019-10-14 21:47:41,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:41,443 INFO L225 Difference]: With dead ends: 113 [2019-10-14 21:47:41,443 INFO L226 Difference]: Without dead ends: 101 [2019-10-14 21:47:41,444 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:47:41,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2019-10-14 21:47:41,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 49. [2019-10-14 21:47:41,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-10-14 21:47:41,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 61 transitions. [2019-10-14 21:47:41,451 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 61 transitions. Word has length 41 [2019-10-14 21:47:41,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:41,451 INFO L462 AbstractCegarLoop]: Abstraction has 49 states and 61 transitions. [2019-10-14 21:47:41,452 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-14 21:47:41,452 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 61 transitions. [2019-10-14 21:47:41,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-10-14 21:47:41,453 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:41,453 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:41,657 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:41,658 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:41,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:41,658 INFO L82 PathProgramCache]: Analyzing trace with hash 14864557, now seen corresponding path program 10 times [2019-10-14 21:47:41,659 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:41,659 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1195896491] [2019-10-14 21:47:41,659 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:41,659 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:41,660 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:41,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:41,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:41,814 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:41,815 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1195896491] [2019-10-14 21:47:41,816 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1126800941] [2019-10-14 21:47:41,816 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:41,896 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:47:41,896 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:41,898 INFO L256 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 21:47:41,906 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:41,953 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:41,953 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:41,954 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-10-14 21:47:41,955 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067970631] [2019-10-14 21:47:41,956 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-14 21:47:41,959 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:41,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-14 21:47:41,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:47:41,960 INFO L87 Difference]: Start difference. First operand 49 states and 61 transitions. Second operand 15 states. [2019-10-14 21:47:42,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:42,216 INFO L93 Difference]: Finished difference Result 121 states and 159 transitions. [2019-10-14 21:47:42,218 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 21:47:42,218 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2019-10-14 21:47:42,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:42,219 INFO L225 Difference]: With dead ends: 121 [2019-10-14 21:47:42,220 INFO L226 Difference]: Without dead ends: 109 [2019-10-14 21:47:42,221 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:47:42,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2019-10-14 21:47:42,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 52. [2019-10-14 21:47:42,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-10-14 21:47:42,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 65 transitions. [2019-10-14 21:47:42,241 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 65 transitions. Word has length 44 [2019-10-14 21:47:42,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:42,242 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 65 transitions. [2019-10-14 21:47:42,242 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-14 21:47:42,242 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 65 transitions. [2019-10-14 21:47:42,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-10-14 21:47:42,243 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:42,246 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:42,447 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:42,448 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:42,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:42,449 INFO L82 PathProgramCache]: Analyzing trace with hash -44913494, now seen corresponding path program 11 times [2019-10-14 21:47:42,449 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:42,449 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1117257589] [2019-10-14 21:47:42,449 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:42,450 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:42,450 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:42,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:42,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:42,684 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:42,685 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1117257589] [2019-10-14 21:47:42,685 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1805020439] [2019-10-14 21:47:42,685 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:44,617 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-10-14 21:47:44,617 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:44,622 INFO L256 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-14 21:47:44,624 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:44,645 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:44,645 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:44,646 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-10-14 21:47:44,646 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969801845] [2019-10-14 21:47:44,646 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-14 21:47:44,647 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:44,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-14 21:47:44,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-14 21:47:44,648 INFO L87 Difference]: Start difference. First operand 52 states and 65 transitions. Second operand 16 states. [2019-10-14 21:47:44,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:44,914 INFO L93 Difference]: Finished difference Result 129 states and 170 transitions. [2019-10-14 21:47:44,915 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-14 21:47:44,915 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 47 [2019-10-14 21:47:44,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:44,917 INFO L225 Difference]: With dead ends: 129 [2019-10-14 21:47:44,917 INFO L226 Difference]: Without dead ends: 117 [2019-10-14 21:47:44,917 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-14 21:47:44,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2019-10-14 21:47:44,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 55. [2019-10-14 21:47:44,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-10-14 21:47:44,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 69 transitions. [2019-10-14 21:47:44,924 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 69 transitions. Word has length 47 [2019-10-14 21:47:44,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:44,925 INFO L462 AbstractCegarLoop]: Abstraction has 55 states and 69 transitions. [2019-10-14 21:47:44,925 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-14 21:47:44,925 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 69 transitions. [2019-10-14 21:47:44,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-10-14 21:47:44,926 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:44,926 INFO L380 BasicCegarLoop]: trace histogram [12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:45,139 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:45,140 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:45,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:45,141 INFO L82 PathProgramCache]: Analyzing trace with hash 1518597005, now seen corresponding path program 12 times [2019-10-14 21:47:45,141 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:45,141 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1692954379] [2019-10-14 21:47:45,142 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:45,142 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:45,142 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:45,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:45,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:45,324 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:45,324 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1692954379] [2019-10-14 21:47:45,325 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1865747266] [2019-10-14 21:47:45,325 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:46,105 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-10-14 21:47:46,105 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:46,108 INFO L256 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-14 21:47:46,110 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:46,142 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:46,142 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:46,142 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2019-10-14 21:47:46,142 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878061956] [2019-10-14 21:47:46,143 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-14 21:47:46,143 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:46,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-14 21:47:46,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-10-14 21:47:46,145 INFO L87 Difference]: Start difference. First operand 55 states and 69 transitions. Second operand 17 states. [2019-10-14 21:47:46,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:46,466 INFO L93 Difference]: Finished difference Result 137 states and 181 transitions. [2019-10-14 21:47:46,466 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-10-14 21:47:46,466 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 50 [2019-10-14 21:47:46,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:46,468 INFO L225 Difference]: With dead ends: 137 [2019-10-14 21:47:46,468 INFO L226 Difference]: Without dead ends: 125 [2019-10-14 21:47:46,468 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-10-14 21:47:46,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2019-10-14 21:47:46,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 58. [2019-10-14 21:47:46,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-10-14 21:47:46,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 73 transitions. [2019-10-14 21:47:46,475 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 73 transitions. Word has length 50 [2019-10-14 21:47:46,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:46,475 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 73 transitions. [2019-10-14 21:47:46,475 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-14 21:47:46,475 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 73 transitions. [2019-10-14 21:47:46,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2019-10-14 21:47:46,476 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:46,476 INFO L380 BasicCegarLoop]: trace histogram [13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:46,692 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:46,692 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:46,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:46,693 INFO L82 PathProgramCache]: Analyzing trace with hash 1139547594, now seen corresponding path program 13 times [2019-10-14 21:47:46,694 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:46,694 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1011378286] [2019-10-14 21:47:46,694 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:46,695 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:46,695 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:46,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:46,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:46,873 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 0 proven. 247 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:46,874 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1011378286] [2019-10-14 21:47:46,874 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [983319459] [2019-10-14 21:47:46,874 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:46,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:46,946 INFO L256 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-14 21:47:46,947 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:46,963 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 0 proven. 247 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:46,963 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:46,964 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-10-14 21:47:46,964 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070786164] [2019-10-14 21:47:46,964 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-14 21:47:46,964 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:46,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-14 21:47:46,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:47:46,965 INFO L87 Difference]: Start difference. First operand 58 states and 73 transitions. Second operand 18 states. [2019-10-14 21:47:47,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:47,301 INFO L93 Difference]: Finished difference Result 145 states and 192 transitions. [2019-10-14 21:47:47,302 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-14 21:47:47,302 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 53 [2019-10-14 21:47:47,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:47,304 INFO L225 Difference]: With dead ends: 145 [2019-10-14 21:47:47,304 INFO L226 Difference]: Without dead ends: 133 [2019-10-14 21:47:47,305 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:47:47,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2019-10-14 21:47:47,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 61. [2019-10-14 21:47:47,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-10-14 21:47:47,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 77 transitions. [2019-10-14 21:47:47,316 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 77 transitions. Word has length 53 [2019-10-14 21:47:47,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:47,316 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 77 transitions. [2019-10-14 21:47:47,316 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-14 21:47:47,317 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 77 transitions. [2019-10-14 21:47:47,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2019-10-14 21:47:47,317 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:47,318 INFO L380 BasicCegarLoop]: trace histogram [14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:47,521 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:47,521 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:47,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:47,522 INFO L82 PathProgramCache]: Analyzing trace with hash 347565677, now seen corresponding path program 14 times [2019-10-14 21:47:47,522 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:47,522 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [93218927] [2019-10-14 21:47:47,522 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:47,523 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:47,523 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:47,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:47,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:47,689 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 0 proven. 287 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:47,690 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [93218927] [2019-10-14 21:47:47,690 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1068017793] [2019-10-14 21:47:47,690 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:47,749 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:47:47,749 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:47,750 INFO L256 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-14 21:47:47,752 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:47,767 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 0 proven. 287 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:47,767 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:47,767 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-10-14 21:47:47,768 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [4495194] [2019-10-14 21:47:47,768 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-14 21:47:47,768 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:47,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-14 21:47:47,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:47:47,769 INFO L87 Difference]: Start difference. First operand 61 states and 77 transitions. Second operand 19 states. [2019-10-14 21:47:48,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:48,130 INFO L93 Difference]: Finished difference Result 153 states and 203 transitions. [2019-10-14 21:47:48,130 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-14 21:47:48,130 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 56 [2019-10-14 21:47:48,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:48,132 INFO L225 Difference]: With dead ends: 153 [2019-10-14 21:47:48,132 INFO L226 Difference]: Without dead ends: 141 [2019-10-14 21:47:48,133 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:47:48,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2019-10-14 21:47:48,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 64. [2019-10-14 21:47:48,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-10-14 21:47:48,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 81 transitions. [2019-10-14 21:47:48,139 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 81 transitions. Word has length 56 [2019-10-14 21:47:48,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:48,139 INFO L462 AbstractCegarLoop]: Abstraction has 64 states and 81 transitions. [2019-10-14 21:47:48,139 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-14 21:47:48,139 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 81 transitions. [2019-10-14 21:47:48,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2019-10-14 21:47:48,140 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:48,140 INFO L380 BasicCegarLoop]: trace histogram [15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:48,346 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:48,346 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:48,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:48,347 INFO L82 PathProgramCache]: Analyzing trace with hash -1330366742, now seen corresponding path program 15 times [2019-10-14 21:47:48,347 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:48,348 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1817648686] [2019-10-14 21:47:48,348 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:48,348 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:48,348 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:48,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:48,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:48,564 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 0 proven. 330 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:48,564 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1817648686] [2019-10-14 21:47:48,564 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1137179891] [2019-10-14 21:47:48,564 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:51,671 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-10-14 21:47:51,671 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:51,675 INFO L256 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 17 conjunts are in the unsatisfiable core [2019-10-14 21:47:51,676 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:51,705 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 0 proven. 330 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:51,706 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:51,706 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2019-10-14 21:47:51,706 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105451912] [2019-10-14 21:47:51,707 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-14 21:47:51,707 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:51,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-14 21:47:51,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:47:51,707 INFO L87 Difference]: Start difference. First operand 64 states and 81 transitions. Second operand 20 states. [2019-10-14 21:47:52,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:52,045 INFO L93 Difference]: Finished difference Result 161 states and 214 transitions. [2019-10-14 21:47:52,046 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-14 21:47:52,046 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 59 [2019-10-14 21:47:52,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:52,047 INFO L225 Difference]: With dead ends: 161 [2019-10-14 21:47:52,047 INFO L226 Difference]: Without dead ends: 149 [2019-10-14 21:47:52,048 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:47:52,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2019-10-14 21:47:52,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 67. [2019-10-14 21:47:52,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2019-10-14 21:47:52,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 85 transitions. [2019-10-14 21:47:52,054 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 85 transitions. Word has length 59 [2019-10-14 21:47:52,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:52,054 INFO L462 AbstractCegarLoop]: Abstraction has 67 states and 85 transitions. [2019-10-14 21:47:52,054 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-14 21:47:52,054 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 85 transitions. [2019-10-14 21:47:52,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2019-10-14 21:47:52,055 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:52,055 INFO L380 BasicCegarLoop]: trace histogram [16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:52,262 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:52,262 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:52,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:52,263 INFO L82 PathProgramCache]: Analyzing trace with hash 509296973, now seen corresponding path program 16 times [2019-10-14 21:47:52,263 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:52,264 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [38919894] [2019-10-14 21:47:52,264 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:52,264 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:52,264 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:52,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:52,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:52,474 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 0 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:52,474 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [38919894] [2019-10-14 21:47:52,475 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1628474358] [2019-10-14 21:47:52,475 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:52,530 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:47:52,531 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:52,532 INFO L256 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-14 21:47:52,533 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:52,549 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 0 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:52,550 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:52,550 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2019-10-14 21:47:52,550 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [271778149] [2019-10-14 21:47:52,551 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-14 21:47:52,551 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:52,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-14 21:47:52,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-10-14 21:47:52,552 INFO L87 Difference]: Start difference. First operand 67 states and 85 transitions. Second operand 21 states. [2019-10-14 21:47:52,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:52,889 INFO L93 Difference]: Finished difference Result 169 states and 225 transitions. [2019-10-14 21:47:52,889 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-14 21:47:52,889 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 62 [2019-10-14 21:47:52,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:52,890 INFO L225 Difference]: With dead ends: 169 [2019-10-14 21:47:52,891 INFO L226 Difference]: Without dead ends: 157 [2019-10-14 21:47:52,891 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-10-14 21:47:52,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2019-10-14 21:47:52,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 70. [2019-10-14 21:47:52,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2019-10-14 21:47:52,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 89 transitions. [2019-10-14 21:47:52,898 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 89 transitions. Word has length 62 [2019-10-14 21:47:52,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:52,899 INFO L462 AbstractCegarLoop]: Abstraction has 70 states and 89 transitions. [2019-10-14 21:47:52,899 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-14 21:47:52,899 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 89 transitions. [2019-10-14 21:47:52,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2019-10-14 21:47:52,899 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:52,900 INFO L380 BasicCegarLoop]: trace histogram [17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:53,103 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:53,104 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:53,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:53,104 INFO L82 PathProgramCache]: Analyzing trace with hash -2146633718, now seen corresponding path program 17 times [2019-10-14 21:47:53,105 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:53,105 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [947373380] [2019-10-14 21:47:53,106 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:53,106 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:53,106 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:53,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:53,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:53,316 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 0 proven. 425 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:53,317 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [947373380] [2019-10-14 21:47:53,317 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [887618807] [2019-10-14 21:47:53,317 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:48:15,378 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2019-10-14 21:48:15,378 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:48:15,391 INFO L256 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 19 conjunts are in the unsatisfiable core [2019-10-14 21:48:15,393 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:48:15,419 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 0 proven. 425 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:48:15,420 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:48:15,420 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2019-10-14 21:48:15,420 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654700108] [2019-10-14 21:48:15,422 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-10-14 21:48:15,422 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:48:15,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-10-14 21:48:15,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-10-14 21:48:15,423 INFO L87 Difference]: Start difference. First operand 70 states and 89 transitions. Second operand 22 states. [2019-10-14 21:48:15,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:48:15,797 INFO L93 Difference]: Finished difference Result 177 states and 236 transitions. [2019-10-14 21:48:15,797 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-14 21:48:15,797 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 65 [2019-10-14 21:48:15,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:48:15,799 INFO L225 Difference]: With dead ends: 177 [2019-10-14 21:48:15,799 INFO L226 Difference]: Without dead ends: 165 [2019-10-14 21:48:15,799 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-10-14 21:48:15,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2019-10-14 21:48:15,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 73. [2019-10-14 21:48:15,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-10-14 21:48:15,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 93 transitions. [2019-10-14 21:48:15,811 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 93 transitions. Word has length 65 [2019-10-14 21:48:15,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:48:15,811 INFO L462 AbstractCegarLoop]: Abstraction has 73 states and 93 transitions. [2019-10-14 21:48:15,812 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-10-14 21:48:15,812 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 93 transitions. [2019-10-14 21:48:15,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2019-10-14 21:48:15,813 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:48:15,813 INFO L380 BasicCegarLoop]: trace histogram [18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:48:16,014 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:48:16,014 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:48:16,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:48:16,014 INFO L82 PathProgramCache]: Analyzing trace with hash 1204644909, now seen corresponding path program 18 times [2019-10-14 21:48:16,015 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:48:16,015 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1542612822] [2019-10-14 21:48:16,015 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:16,015 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:16,015 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:48:16,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:16,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:16,304 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 0 proven. 477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:48:16,305 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1542612822] [2019-10-14 21:48:16,305 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1540526710] [2019-10-14 21:48:16,305 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true