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-examples/standard_vector_difference_ground.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f4eb214f-m [2019-10-13 17:48:08,041 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-13 17:48:08,043 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-13 17:48:08,059 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-13 17:48:08,059 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-13 17:48:08,061 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-13 17:48:08,062 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-13 17:48:08,064 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-13 17:48:08,065 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-13 17:48:08,066 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-13 17:48:08,067 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-13 17:48:08,068 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-13 17:48:08,069 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-13 17:48:08,070 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-13 17:48:08,070 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-13 17:48:08,072 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-13 17:48:08,072 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-13 17:48:08,073 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-13 17:48:08,075 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-13 17:48:08,077 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-13 17:48:08,078 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-13 17:48:08,079 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-13 17:48:08,080 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-13 17:48:08,081 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-13 17:48:08,086 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-13 17:48:08,089 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-13 17:48:08,090 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-13 17:48:08,091 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-13 17:48:08,092 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-13 17:48:08,093 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-13 17:48:08,093 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-13 17:48:08,094 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-13 17:48:08,094 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-13 17:48:08,094 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-13 17:48:08,095 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-13 17:48:08,096 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-13 17:48:08,096 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 [2019-10-13 17:48:08,116 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-13 17:48:08,116 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-13 17:48:08,118 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-13 17:48:08,118 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-13 17:48:08,119 INFO L138 SettingsManager]: * Use SBE=true [2019-10-13 17:48:08,119 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-13 17:48:08,119 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-13 17:48:08,120 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-13 17:48:08,120 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-13 17:48:08,120 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-13 17:48:08,121 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-13 17:48:08,121 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-13 17:48:08,122 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-13 17:48:08,122 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-13 17:48:08,122 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-13 17:48:08,122 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-13 17:48:08,123 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-13 17:48:08,123 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-13 17:48:08,123 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-13 17:48:08,123 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-13 17:48:08,124 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-13 17:48:08,124 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-13 17:48:08,124 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-13 17:48:08,124 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-13 17:48:08,124 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-13 17:48:08,125 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-13 17:48:08,125 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-13 17:48:08,125 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-13 17:48:08,125 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-13 17:48:08,391 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-13 17:48:08,405 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-13 17:48:08,409 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-13 17:48:08,410 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-13 17:48:08,411 INFO L275 PluginConnector]: CDTParser initialized [2019-10-13 17:48:08,411 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_vector_difference_ground.i [2019-10-13 17:48:08,485 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b5db773ec/da069fbda6484a9eb4ff0b463de07713/FLAG5f6b944d6 [2019-10-13 17:48:08,962 INFO L306 CDTParser]: Found 1 translation units. [2019-10-13 17:48:08,963 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_vector_difference_ground.i [2019-10-13 17:48:08,970 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b5db773ec/da069fbda6484a9eb4ff0b463de07713/FLAG5f6b944d6 [2019-10-13 17:48:09,391 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b5db773ec/da069fbda6484a9eb4ff0b463de07713 [2019-10-13 17:48:09,402 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-13 17:48:09,403 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-13 17:48:09,406 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-13 17:48:09,406 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-13 17:48:09,410 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-13 17:48:09,411 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 05:48:09" (1/1) ... [2019-10-13 17:48:09,414 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5627da55 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:48:09, skipping insertion in model container [2019-10-13 17:48:09,414 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 05:48:09" (1/1) ... [2019-10-13 17:48:09,422 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-13 17:48:09,442 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-13 17:48:09,619 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 17:48:09,623 INFO L188 MainTranslator]: Completed pre-run [2019-10-13 17:48:09,646 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 17:48:09,666 INFO L192 MainTranslator]: Completed translation [2019-10-13 17:48:09,666 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:48:09 WrapperNode [2019-10-13 17:48:09,666 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-13 17:48:09,667 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-13 17:48:09,667 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-13 17:48:09,667 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-13 17:48:09,757 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:48:09" (1/1) ... [2019-10-13 17:48:09,757 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:48:09" (1/1) ... [2019-10-13 17:48:09,764 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:48:09" (1/1) ... [2019-10-13 17:48:09,764 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:48:09" (1/1) ... [2019-10-13 17:48:09,771 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:48:09" (1/1) ... [2019-10-13 17:48:09,777 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:48:09" (1/1) ... [2019-10-13 17:48:09,778 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:48:09" (1/1) ... [2019-10-13 17:48:09,780 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-13 17:48:09,781 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-13 17:48:09,781 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-13 17:48:09,781 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-13 17:48:09,782 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:48:09" (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 [2019-10-13 17:48:09,842 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-13 17:48:09,842 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-13 17:48:09,842 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-13 17:48:09,842 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-13 17:48:09,842 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-13 17:48:09,843 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-13 17:48:09,843 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-13 17:48:09,843 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-13 17:48:09,843 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-13 17:48:09,843 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-13 17:48:09,843 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-13 17:48:09,843 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-13 17:48:09,843 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-13 17:48:09,844 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-13 17:48:10,113 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-13 17:48:10,114 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-10-13 17:48:10,115 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 05:48:10 BoogieIcfgContainer [2019-10-13 17:48:10,115 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-13 17:48:10,116 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-13 17:48:10,116 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-13 17:48:10,120 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-13 17:48:10,120 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 05:48:09" (1/3) ... [2019-10-13 17:48:10,121 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@472a31b2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 05:48:10, skipping insertion in model container [2019-10-13 17:48:10,121 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:48:09" (2/3) ... [2019-10-13 17:48:10,122 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@472a31b2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 05:48:10, skipping insertion in model container [2019-10-13 17:48:10,122 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 05:48:10" (3/3) ... [2019-10-13 17:48:10,124 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_vector_difference_ground.i [2019-10-13 17:48:10,135 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-13 17:48:10,142 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-13 17:48:10,155 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-13 17:48:10,195 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-13 17:48:10,196 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-13 17:48:10,196 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-13 17:48:10,196 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-13 17:48:10,196 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-13 17:48:10,196 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-13 17:48:10,197 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-13 17:48:10,197 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-13 17:48:10,219 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2019-10-13 17:48:10,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-13 17:48:10,225 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:48:10,226 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:48:10,228 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:48:10,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:48:10,234 INFO L82 PathProgramCache]: Analyzing trace with hash -1498727252, now seen corresponding path program 1 times [2019-10-13 17:48:10,240 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:48:10,241 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1066424591] [2019-10-13 17:48:10,241 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:10,241 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:10,241 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:48:10,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:10,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:10,399 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:48:10,400 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1066424591] [2019-10-13 17:48:10,401 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:48:10,401 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-13 17:48:10,401 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671588825] [2019-10-13 17:48:10,406 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-13 17:48:10,407 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:48:10,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-13 17:48:10,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-13 17:48:10,425 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 3 states. [2019-10-13 17:48:10,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:48:10,535 INFO L93 Difference]: Finished difference Result 44 states and 55 transitions. [2019-10-13 17:48:10,536 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 17:48:10,537 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2019-10-13 17:48:10,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:48:10,546 INFO L225 Difference]: With dead ends: 44 [2019-10-13 17:48:10,546 INFO L226 Difference]: Without dead ends: 21 [2019-10-13 17:48:10,550 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 [2019-10-13 17:48:10,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-10-13 17:48:10,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-10-13 17:48:10,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-10-13 17:48:10,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2019-10-13 17:48:10,602 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 15 [2019-10-13 17:48:10,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:48:10,603 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2019-10-13 17:48:10,603 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-13 17:48:10,603 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2019-10-13 17:48:10,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-13 17:48:10,605 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:48:10,605 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:48:10,605 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:48:10,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:48:10,606 INFO L82 PathProgramCache]: Analyzing trace with hash 756064934, now seen corresponding path program 1 times [2019-10-13 17:48:10,606 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:48:10,607 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1843305923] [2019-10-13 17:48:10,607 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:10,607 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:10,607 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:48:10,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:10,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:10,688 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:48:10,689 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1843305923] [2019-10-13 17:48:10,689 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:48:10,689 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-13 17:48:10,690 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [941329234] [2019-10-13 17:48:10,691 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 17:48:10,692 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:48:10,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 17:48:10,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:48:10,700 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 4 states. [2019-10-13 17:48:10,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:48:10,802 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2019-10-13 17:48:10,802 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 17:48:10,802 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2019-10-13 17:48:10,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:48:10,803 INFO L225 Difference]: With dead ends: 37 [2019-10-13 17:48:10,804 INFO L226 Difference]: Without dead ends: 24 [2019-10-13 17:48:10,805 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 [2019-10-13 17:48:10,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-10-13 17:48:10,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2019-10-13 17:48:10,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-10-13 17:48:10,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2019-10-13 17:48:10,812 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 15 [2019-10-13 17:48:10,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:48:10,812 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2019-10-13 17:48:10,812 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 17:48:10,812 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2019-10-13 17:48:10,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-10-13 17:48:10,813 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:48:10,813 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:48:10,814 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:48:10,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:48:10,814 INFO L82 PathProgramCache]: Analyzing trace with hash 434016106, now seen corresponding path program 1 times [2019-10-13 17:48:10,815 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:48:10,815 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1495210651] [2019-10-13 17:48:10,815 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:10,815 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:10,816 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:48:10,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:10,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:10,950 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-13 17:48:10,952 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1495210651] [2019-10-13 17:48:10,953 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [195884886] [2019-10-13 17:48:10,953 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 [2019-10-13 17:48:11,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:11,018 INFO L256 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-13 17:48:11,025 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:48:11,061 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-13 17:48:11,062 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:48:11,062 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-10-13 17:48:11,062 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084643520] [2019-10-13 17:48:11,063 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-13 17:48:11,063 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:48:11,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-13 17:48:11,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-13 17:48:11,064 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 6 states. [2019-10-13 17:48:11,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:48:11,178 INFO L93 Difference]: Finished difference Result 41 states and 46 transitions. [2019-10-13 17:48:11,178 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-13 17:48:11,178 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 18 [2019-10-13 17:48:11,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:48:11,179 INFO L225 Difference]: With dead ends: 41 [2019-10-13 17:48:11,180 INFO L226 Difference]: Without dead ends: 27 [2019-10-13 17:48:11,180 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-13 17:48:11,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-10-13 17:48:11,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2019-10-13 17:48:11,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-10-13 17:48:11,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2019-10-13 17:48:11,187 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 18 [2019-10-13 17:48:11,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:48:11,188 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2019-10-13 17:48:11,188 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-13 17:48:11,188 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2019-10-13 17:48:11,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-13 17:48:11,189 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:48:11,189 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:48:11,397 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:48:11,398 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:48:11,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:48:11,398 INFO L82 PathProgramCache]: Analyzing trace with hash 1099220258, now seen corresponding path program 2 times [2019-10-13 17:48:11,399 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:48:11,399 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [464522078] [2019-10-13 17:48:11,400 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:11,400 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:11,400 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:48:11,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:11,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:11,523 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-13 17:48:11,524 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [464522078] [2019-10-13 17:48:11,524 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1861520941] [2019-10-13 17:48:11,524 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 [2019-10-13 17:48:11,584 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:48:11,585 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:48:11,586 INFO L256 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-13 17:48:11,587 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:48:11,601 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-13 17:48:11,601 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:48:11,601 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-10-13 17:48:11,602 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [648798025] [2019-10-13 17:48:11,604 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-13 17:48:11,604 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:48:11,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-13 17:48:11,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-13 17:48:11,605 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 7 states. [2019-10-13 17:48:11,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:48:11,706 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2019-10-13 17:48:11,707 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-13 17:48:11,707 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2019-10-13 17:48:11,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:48:11,708 INFO L225 Difference]: With dead ends: 45 [2019-10-13 17:48:11,708 INFO L226 Difference]: Without dead ends: 30 [2019-10-13 17:48:11,709 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-13 17:48:11,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-10-13 17:48:11,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2019-10-13 17:48:11,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-10-13 17:48:11,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2019-10-13 17:48:11,720 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 21 [2019-10-13 17:48:11,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:48:11,721 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2019-10-13 17:48:11,721 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-13 17:48:11,721 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2019-10-13 17:48:11,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-10-13 17:48:11,724 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:48:11,724 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:48:11,925 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:48:11,925 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:48:11,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:48:11,926 INFO L82 PathProgramCache]: Analyzing trace with hash 1323870958, now seen corresponding path program 3 times [2019-10-13 17:48:11,926 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:48:11,927 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [821137884] [2019-10-13 17:48:11,927 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:11,927 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:11,927 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:48:11,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:12,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:12,025 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-13 17:48:12,026 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [821137884] [2019-10-13 17:48:12,026 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [800798207] [2019-10-13 17:48:12,026 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 [2019-10-13 17:48:12,071 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-13 17:48:12,071 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:48:12,072 INFO L256 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-13 17:48:12,074 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:48:12,088 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-13 17:48:12,089 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:48:12,089 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-10-13 17:48:12,089 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083856379] [2019-10-13 17:48:12,090 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-13 17:48:12,090 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:48:12,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-13 17:48:12,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-13 17:48:12,091 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 8 states. [2019-10-13 17:48:12,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:48:12,171 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2019-10-13 17:48:12,171 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-13 17:48:12,172 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2019-10-13 17:48:12,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:48:12,173 INFO L225 Difference]: With dead ends: 49 [2019-10-13 17:48:12,173 INFO L226 Difference]: Without dead ends: 33 [2019-10-13 17:48:12,173 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-13 17:48:12,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-10-13 17:48:12,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2019-10-13 17:48:12,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-10-13 17:48:12,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2019-10-13 17:48:12,180 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 24 [2019-10-13 17:48:12,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:48:12,180 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2019-10-13 17:48:12,180 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-13 17:48:12,180 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2019-10-13 17:48:12,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-13 17:48:12,181 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:48:12,181 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:48:12,384 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:48:12,385 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:48:12,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:48:12,385 INFO L82 PathProgramCache]: Analyzing trace with hash 1351588766, now seen corresponding path program 4 times [2019-10-13 17:48:12,385 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:48:12,386 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1319372634] [2019-10-13 17:48:12,386 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:12,386 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:12,386 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:48:12,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:12,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:12,522 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-13 17:48:12,523 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1319372634] [2019-10-13 17:48:12,523 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1498949917] [2019-10-13 17:48:12,523 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 [2019-10-13 17:48:12,573 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:48:12,573 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:48:12,574 INFO L256 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-13 17:48:12,576 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:48:12,597 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-13 17:48:12,598 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:48:12,601 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-10-13 17:48:12,601 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522595993] [2019-10-13 17:48:12,602 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-13 17:48:12,602 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:48:12,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-13 17:48:12,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-13 17:48:12,603 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 9 states. [2019-10-13 17:48:12,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:48:12,712 INFO L93 Difference]: Finished difference Result 53 states and 58 transitions. [2019-10-13 17:48:12,712 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-13 17:48:12,712 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2019-10-13 17:48:12,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:48:12,713 INFO L225 Difference]: With dead ends: 53 [2019-10-13 17:48:12,713 INFO L226 Difference]: Without dead ends: 36 [2019-10-13 17:48:12,714 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-13 17:48:12,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-10-13 17:48:12,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2019-10-13 17:48:12,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-10-13 17:48:12,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2019-10-13 17:48:12,720 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 27 [2019-10-13 17:48:12,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:48:12,720 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2019-10-13 17:48:12,720 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-13 17:48:12,721 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2019-10-13 17:48:12,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-10-13 17:48:12,721 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:48:12,722 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:48:12,926 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:48:12,927 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:48:12,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:48:12,928 INFO L82 PathProgramCache]: Analyzing trace with hash 2074456690, now seen corresponding path program 5 times [2019-10-13 17:48:12,928 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:48:12,929 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [885034034] [2019-10-13 17:48:12,929 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:12,929 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:12,930 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:48:12,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:13,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:13,031 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-10-13 17:48:13,032 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [885034034] [2019-10-13 17:48:13,032 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [157834928] [2019-10-13 17:48:13,032 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 [2019-10-13 17:48:13,354 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-10-13 17:48:13,355 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:48:13,356 INFO L256 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-13 17:48:13,359 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:48:13,387 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-13 17:48:13,388 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:48:13,388 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-10-13 17:48:13,389 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834943086] [2019-10-13 17:48:13,389 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-13 17:48:13,389 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:48:13,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-13 17:48:13,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-13 17:48:13,390 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 10 states. [2019-10-13 17:48:13,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:48:13,500 INFO L93 Difference]: Finished difference Result 57 states and 62 transitions. [2019-10-13 17:48:13,501 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-13 17:48:13,501 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2019-10-13 17:48:13,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:48:13,502 INFO L225 Difference]: With dead ends: 57 [2019-10-13 17:48:13,502 INFO L226 Difference]: Without dead ends: 39 [2019-10-13 17:48:13,503 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-13 17:48:13,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-10-13 17:48:13,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2019-10-13 17:48:13,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-10-13 17:48:13,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2019-10-13 17:48:13,509 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 30 [2019-10-13 17:48:13,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:48:13,509 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2019-10-13 17:48:13,509 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-13 17:48:13,519 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2019-10-13 17:48:13,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-10-13 17:48:13,522 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:48:13,522 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:48:13,728 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:48:13,728 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:48:13,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:48:13,729 INFO L82 PathProgramCache]: Analyzing trace with hash -1266817510, now seen corresponding path program 6 times [2019-10-13 17:48:13,729 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:48:13,730 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1579194267] [2019-10-13 17:48:13,730 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:13,730 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:13,730 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:48:13,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:13,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:13,872 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-13 17:48:13,872 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1579194267] [2019-10-13 17:48:13,872 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1965514922] [2019-10-13 17:48:13,873 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 [2019-10-13 17:48:14,085 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-10-13 17:48:14,085 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:48:14,087 INFO L256 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-13 17:48:14,089 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:48:14,105 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-13 17:48:14,106 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:48:14,106 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-10-13 17:48:14,111 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332534701] [2019-10-13 17:48:14,112 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-13 17:48:14,112 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:48:14,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-13 17:48:14,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-13 17:48:14,113 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 11 states. [2019-10-13 17:48:14,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:48:14,220 INFO L93 Difference]: Finished difference Result 61 states and 66 transitions. [2019-10-13 17:48:14,220 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-13 17:48:14,221 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 33 [2019-10-13 17:48:14,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:48:14,222 INFO L225 Difference]: With dead ends: 61 [2019-10-13 17:48:14,222 INFO L226 Difference]: Without dead ends: 42 [2019-10-13 17:48:14,223 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-13 17:48:14,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-10-13 17:48:14,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2019-10-13 17:48:14,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-10-13 17:48:14,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2019-10-13 17:48:14,228 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 33 [2019-10-13 17:48:14,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:48:14,229 INFO L462 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2019-10-13 17:48:14,229 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-13 17:48:14,229 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2019-10-13 17:48:14,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-10-13 17:48:14,230 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:48:14,230 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:48:14,435 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:48:14,436 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:48:14,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:48:14,437 INFO L82 PathProgramCache]: Analyzing trace with hash -1266096650, now seen corresponding path program 7 times [2019-10-13 17:48:14,437 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:48:14,437 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1467700082] [2019-10-13 17:48:14,438 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:14,438 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:14,438 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:48:14,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:14,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:14,561 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2019-10-13 17:48:14,561 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1467700082] [2019-10-13 17:48:14,562 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [275916767] [2019-10-13 17:48:14,562 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 [2019-10-13 17:48:14,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:14,613 INFO L256 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-13 17:48:14,621 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:48:14,637 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2019-10-13 17:48:14,637 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:48:14,637 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-10-13 17:48:14,638 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [56669217] [2019-10-13 17:48:14,638 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-13 17:48:14,638 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:48:14,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-13 17:48:14,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-13 17:48:14,639 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 12 states. [2019-10-13 17:48:14,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:48:14,738 INFO L93 Difference]: Finished difference Result 65 states and 70 transitions. [2019-10-13 17:48:14,738 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-13 17:48:14,738 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 36 [2019-10-13 17:48:14,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:48:14,740 INFO L225 Difference]: With dead ends: 65 [2019-10-13 17:48:14,740 INFO L226 Difference]: Without dead ends: 45 [2019-10-13 17:48:14,741 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-13 17:48:14,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2019-10-13 17:48:14,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2019-10-13 17:48:14,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-10-13 17:48:14,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2019-10-13 17:48:14,749 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 36 [2019-10-13 17:48:14,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:48:14,749 INFO L462 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2019-10-13 17:48:14,749 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-13 17:48:14,749 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2019-10-13 17:48:14,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-10-13 17:48:14,750 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:48:14,750 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:48:14,951 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:48:14,952 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:48:14,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:48:14,952 INFO L82 PathProgramCache]: Analyzing trace with hash -786668394, now seen corresponding path program 8 times [2019-10-13 17:48:14,953 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:48:14,953 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [85719422] [2019-10-13 17:48:14,953 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:14,953 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:14,954 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:48:14,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:15,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:15,090 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-13 17:48:15,090 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [85719422] [2019-10-13 17:48:15,091 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1551523259] [2019-10-13 17:48:15,091 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 [2019-10-13 17:48:15,145 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:48:15,145 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:48:15,146 INFO L256 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-13 17:48:15,149 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:48:15,186 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-13 17:48:15,186 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:48:15,186 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-10-13 17:48:15,187 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255925472] [2019-10-13 17:48:15,187 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-13 17:48:15,187 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:48:15,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-13 17:48:15,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-13 17:48:15,188 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 13 states. [2019-10-13 17:48:15,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:48:15,295 INFO L93 Difference]: Finished difference Result 69 states and 74 transitions. [2019-10-13 17:48:15,295 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-13 17:48:15,295 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 39 [2019-10-13 17:48:15,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:48:15,296 INFO L225 Difference]: With dead ends: 69 [2019-10-13 17:48:15,296 INFO L226 Difference]: Without dead ends: 48 [2019-10-13 17:48:15,297 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-13 17:48:15,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-10-13 17:48:15,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2019-10-13 17:48:15,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-10-13 17:48:15,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2019-10-13 17:48:15,302 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 39 [2019-10-13 17:48:15,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:48:15,302 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2019-10-13 17:48:15,302 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-13 17:48:15,302 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2019-10-13 17:48:15,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-10-13 17:48:15,304 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:48:15,304 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:48:15,508 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:48:15,509 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:48:15,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:48:15,510 INFO L82 PathProgramCache]: Analyzing trace with hash -1232763526, now seen corresponding path program 9 times [2019-10-13 17:48:15,510 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:48:15,511 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [383126139] [2019-10-13 17:48:15,511 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:15,511 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:15,511 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:48:15,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:15,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:15,664 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-10-13 17:48:15,664 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [383126139] [2019-10-13 17:48:15,664 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [17729278] [2019-10-13 17:48:15,665 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 [2019-10-13 17:48:16,010 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-10-13 17:48:16,011 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:48:16,012 INFO L256 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-13 17:48:16,015 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:48:16,034 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-10-13 17:48:16,035 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:48:16,035 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2019-10-13 17:48:16,035 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1457696484] [2019-10-13 17:48:16,036 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-13 17:48:16,036 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:48:16,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-13 17:48:16,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-13 17:48:16,036 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand 14 states. [2019-10-13 17:48:16,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:48:16,188 INFO L93 Difference]: Finished difference Result 73 states and 78 transitions. [2019-10-13 17:48:16,188 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-13 17:48:16,188 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 42 [2019-10-13 17:48:16,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:48:16,189 INFO L225 Difference]: With dead ends: 73 [2019-10-13 17:48:16,189 INFO L226 Difference]: Without dead ends: 51 [2019-10-13 17:48:16,190 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-13 17:48:16,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2019-10-13 17:48:16,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2019-10-13 17:48:16,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2019-10-13 17:48:16,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2019-10-13 17:48:16,203 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 42 [2019-10-13 17:48:16,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:48:16,204 INFO L462 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2019-10-13 17:48:16,204 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-13 17:48:16,204 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2019-10-13 17:48:16,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-10-13 17:48:16,205 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:48:16,205 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:48:16,408 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:48:16,409 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:48:16,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:48:16,410 INFO L82 PathProgramCache]: Analyzing trace with hash -1346906350, now seen corresponding path program 10 times [2019-10-13 17:48:16,410 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:48:16,410 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1432856314] [2019-10-13 17:48:16,411 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:16,411 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:16,411 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:48:16,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:16,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:16,575 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-10-13 17:48:16,575 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1432856314] [2019-10-13 17:48:16,575 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [316973226] [2019-10-13 17:48:16,575 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 [2019-10-13 17:48:16,637 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:48:16,638 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:48:16,639 INFO L256 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-13 17:48:16,641 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:48:16,658 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-10-13 17:48:16,658 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:48:16,659 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-10-13 17:48:16,659 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [741957704] [2019-10-13 17:48:16,659 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-13 17:48:16,660 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:48:16,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-13 17:48:16,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-13 17:48:16,660 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 15 states. [2019-10-13 17:48:16,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:48:16,816 INFO L93 Difference]: Finished difference Result 77 states and 82 transitions. [2019-10-13 17:48:16,817 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-13 17:48:16,817 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 45 [2019-10-13 17:48:16,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:48:16,818 INFO L225 Difference]: With dead ends: 77 [2019-10-13 17:48:16,818 INFO L226 Difference]: Without dead ends: 54 [2019-10-13 17:48:16,819 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-13 17:48:16,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-10-13 17:48:16,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2019-10-13 17:48:16,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-10-13 17:48:16,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2019-10-13 17:48:16,826 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 45 [2019-10-13 17:48:16,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:48:16,827 INFO L462 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2019-10-13 17:48:16,827 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-13 17:48:16,827 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2019-10-13 17:48:16,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-10-13 17:48:16,828 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:48:16,828 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:48:17,033 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:48:17,034 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:48:17,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:48:17,035 INFO L82 PathProgramCache]: Analyzing trace with hash 1259262206, now seen corresponding path program 11 times [2019-10-13 17:48:17,036 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:48:17,036 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1660973327] [2019-10-13 17:48:17,036 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:17,037 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:17,037 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:48:17,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:17,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:17,181 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-10-13 17:48:17,181 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1660973327] [2019-10-13 17:48:17,181 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [868943025] [2019-10-13 17:48:17,181 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 [2019-10-13 17:48:49,806 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-10-13 17:48:49,806 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:48:49,831 INFO L256 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-13 17:48:49,833 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:48:49,854 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-10-13 17:48:49,855 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:48:49,855 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-10-13 17:48:49,855 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051416474] [2019-10-13 17:48:49,856 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-13 17:48:49,856 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:48:49,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-13 17:48:49,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-13 17:48:49,857 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand 16 states. [2019-10-13 17:48:50,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:48:50,008 INFO L93 Difference]: Finished difference Result 81 states and 86 transitions. [2019-10-13 17:48:50,008 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-13 17:48:50,008 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 48 [2019-10-13 17:48:50,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:48:50,009 INFO L225 Difference]: With dead ends: 81 [2019-10-13 17:48:50,009 INFO L226 Difference]: Without dead ends: 57 [2019-10-13 17:48:50,010 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-13 17:48:50,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2019-10-13 17:48:50,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2019-10-13 17:48:50,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-10-13 17:48:50,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2019-10-13 17:48:50,016 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 48 [2019-10-13 17:48:50,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:48:50,016 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2019-10-13 17:48:50,017 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-13 17:48:50,017 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2019-10-13 17:48:50,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-10-13 17:48:50,018 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:48:50,018 INFO L380 BasicCegarLoop]: trace histogram [12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:48:50,218 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:48:50,219 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:48:50,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:48:50,220 INFO L82 PathProgramCache]: Analyzing trace with hash -1692598898, now seen corresponding path program 12 times [2019-10-13 17:48:50,220 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:48:50,220 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1368707226] [2019-10-13 17:48:50,220 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:50,221 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:48:50,221 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:48:50,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:50,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:48:50,413 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2019-10-13 17:48:50,413 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1368707226] [2019-10-13 17:48:50,413 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [445782121] [2019-10-13 17:48:50,414 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 [2019-10-13 17:49:00,267 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-10-13 17:49:00,268 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:49:00,275 INFO L256 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-13 17:49:00,277 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:49:00,300 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-10-13 17:49:00,300 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:49:00,300 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2019-10-13 17:49:00,301 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443831571] [2019-10-13 17:49:00,301 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-13 17:49:00,301 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:49:00,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-13 17:49:00,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-10-13 17:49:00,302 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 17 states. [2019-10-13 17:49:00,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:49:00,484 INFO L93 Difference]: Finished difference Result 85 states and 90 transitions. [2019-10-13 17:49:00,484 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-10-13 17:49:00,484 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 51 [2019-10-13 17:49:00,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:49:00,485 INFO L225 Difference]: With dead ends: 85 [2019-10-13 17:49:00,487 INFO L226 Difference]: Without dead ends: 60 [2019-10-13 17:49:00,488 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-10-13 17:49:00,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-10-13 17:49:00,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2019-10-13 17:49:00,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-10-13 17:49:00,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2019-10-13 17:49:00,499 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 51 [2019-10-13 17:49:00,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:49:00,499 INFO L462 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2019-10-13 17:49:00,499 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-13 17:49:00,499 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2019-10-13 17:49:00,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-10-13 17:49:00,500 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:49:00,500 INFO L380 BasicCegarLoop]: trace histogram [13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:49:00,711 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:49:00,712 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:49:00,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:49:00,712 INFO L82 PathProgramCache]: Analyzing trace with hash -1407711102, now seen corresponding path program 13 times [2019-10-13 17:49:00,713 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:49:00,713 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [294971350] [2019-10-13 17:49:00,713 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:49:00,714 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:49:00,714 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:49:00,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:49:00,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:49:00,913 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2019-10-13 17:49:00,914 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [294971350] [2019-10-13 17:49:00,914 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1002547688] [2019-10-13 17:49:00,914 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 [2019-10-13 17:49:00,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:49:00,981 INFO L256 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-13 17:49:00,982 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:49:01,001 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2019-10-13 17:49:01,001 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:49:01,001 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-10-13 17:49:01,001 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800999193] [2019-10-13 17:49:01,002 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-13 17:49:01,002 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:49:01,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-13 17:49:01,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-13 17:49:01,004 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand 18 states. [2019-10-13 17:49:01,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:49:01,184 INFO L93 Difference]: Finished difference Result 89 states and 94 transitions. [2019-10-13 17:49:01,184 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-13 17:49:01,184 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 54 [2019-10-13 17:49:01,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:49:01,185 INFO L225 Difference]: With dead ends: 89 [2019-10-13 17:49:01,185 INFO L226 Difference]: Without dead ends: 63 [2019-10-13 17:49:01,188 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-13 17:49:01,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2019-10-13 17:49:01,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2019-10-13 17:49:01,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2019-10-13 17:49:01,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2019-10-13 17:49:01,195 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 54 [2019-10-13 17:49:01,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:49:01,197 INFO L462 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2019-10-13 17:49:01,197 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-13 17:49:01,197 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2019-10-13 17:49:01,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-10-13 17:49:01,198 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:49:01,198 INFO L380 BasicCegarLoop]: trace histogram [14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]