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_copyInitSum2_ground-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f4eb214f-m [2019-10-13 17:45:13,015 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-13 17:45:13,018 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-13 17:45:13,035 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-13 17:45:13,035 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-13 17:45:13,037 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-13 17:45:13,039 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-13 17:45:13,048 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-13 17:45:13,051 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-13 17:45:13,054 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-13 17:45:13,056 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-13 17:45:13,057 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-13 17:45:13,057 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-13 17:45:13,059 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-13 17:45:13,061 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-13 17:45:13,062 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-13 17:45:13,064 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-13 17:45:13,064 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-13 17:45:13,066 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-13 17:45:13,070 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-13 17:45:13,074 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-13 17:45:13,076 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-13 17:45:13,078 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-13 17:45:13,079 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-13 17:45:13,081 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-13 17:45:13,081 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-13 17:45:13,081 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-13 17:45:13,083 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-13 17:45:13,084 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-13 17:45:13,085 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-13 17:45:13,085 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-13 17:45:13,087 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-13 17:45:13,088 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-13 17:45:13,088 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-13 17:45:13,090 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-13 17:45:13,090 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-13 17:45:13,091 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-13 17:45:13,091 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-13 17:45:13,091 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-13 17:45:13,092 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-13 17:45:13,093 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-13 17:45:13,094 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 17:45:13,121 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-13 17:45:13,121 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-13 17:45:13,122 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-13 17:45:13,123 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-13 17:45:13,123 INFO L138 SettingsManager]: * Use SBE=true [2019-10-13 17:45:13,123 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-13 17:45:13,123 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-13 17:45:13,123 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-13 17:45:13,124 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-13 17:45:13,124 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-13 17:45:13,124 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-13 17:45:13,124 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-13 17:45:13,124 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-13 17:45:13,125 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-13 17:45:13,125 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-13 17:45:13,125 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-13 17:45:13,125 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-13 17:45:13,125 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-13 17:45:13,126 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-13 17:45:13,126 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-13 17:45:13,126 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-13 17:45:13,126 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-13 17:45:13,126 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-13 17:45:13,127 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-13 17:45:13,127 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-13 17:45:13,127 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-13 17:45:13,127 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-13 17:45:13,127 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-13 17:45:13,128 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-13 17:45:13,374 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-13 17:45:13,394 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-13 17:45:13,397 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-13 17:45:13,398 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-13 17:45:13,399 INFO L275 PluginConnector]: CDTParser initialized [2019-10-13 17:45:13,399 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_copyInitSum2_ground-1.i [2019-10-13 17:45:13,457 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8c5d1ee9b/3a3b11b131bb480f91b4e9e94d995e83/FLAGc8c046189 [2019-10-13 17:45:13,888 INFO L306 CDTParser]: Found 1 translation units. [2019-10-13 17:45:13,889 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_copyInitSum2_ground-1.i [2019-10-13 17:45:13,896 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8c5d1ee9b/3a3b11b131bb480f91b4e9e94d995e83/FLAGc8c046189 [2019-10-13 17:45:14,299 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8c5d1ee9b/3a3b11b131bb480f91b4e9e94d995e83 [2019-10-13 17:45:14,309 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-13 17:45:14,311 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-13 17:45:14,312 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-13 17:45:14,312 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-13 17:45:14,316 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-13 17:45:14,317 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 05:45:14" (1/1) ... [2019-10-13 17:45:14,320 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1729396c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:14, skipping insertion in model container [2019-10-13 17:45:14,320 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 05:45:14" (1/1) ... [2019-10-13 17:45:14,329 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-13 17:45:14,346 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-13 17:45:14,536 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 17:45:14,549 INFO L188 MainTranslator]: Completed pre-run [2019-10-13 17:45:14,576 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 17:45:14,592 INFO L192 MainTranslator]: Completed translation [2019-10-13 17:45:14,593 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:14 WrapperNode [2019-10-13 17:45:14,593 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-13 17:45:14,594 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-13 17:45:14,594 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-13 17:45:14,594 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-13 17:45:14,693 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:14" (1/1) ... [2019-10-13 17:45:14,693 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:14" (1/1) ... [2019-10-13 17:45:14,701 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:14" (1/1) ... [2019-10-13 17:45:14,701 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:14" (1/1) ... [2019-10-13 17:45:14,714 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:14" (1/1) ... [2019-10-13 17:45:14,720 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:14" (1/1) ... [2019-10-13 17:45:14,722 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:14" (1/1) ... [2019-10-13 17:45:14,724 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-13 17:45:14,725 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-13 17:45:14,725 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-13 17:45:14,725 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-13 17:45:14,726 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:14" (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 17:45:14,787 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-13 17:45:14,787 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-13 17:45:14,787 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-13 17:45:14,788 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-13 17:45:14,788 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-13 17:45:14,788 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-13 17:45:14,788 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-13 17:45:14,788 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-13 17:45:14,788 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-13 17:45:14,788 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-13 17:45:14,789 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-13 17:45:14,789 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-13 17:45:14,789 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-13 17:45:15,041 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-13 17:45:15,042 INFO L284 CfgBuilder]: Removed 4 assume(true) statements. [2019-10-13 17:45:15,043 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 05:45:15 BoogieIcfgContainer [2019-10-13 17:45:15,044 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-13 17:45:15,054 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-13 17:45:15,054 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-13 17:45:15,057 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-13 17:45:15,058 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 05:45:14" (1/3) ... [2019-10-13 17:45:15,059 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e422446 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 05:45:15, skipping insertion in model container [2019-10-13 17:45:15,059 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:14" (2/3) ... [2019-10-13 17:45:15,059 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e422446 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 05:45:15, skipping insertion in model container [2019-10-13 17:45:15,059 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 05:45:15" (3/3) ... [2019-10-13 17:45:15,061 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_copyInitSum2_ground-1.i [2019-10-13 17:45:15,079 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-13 17:45:15,089 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-13 17:45:15,104 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-13 17:45:15,134 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-13 17:45:15,134 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-13 17:45:15,134 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-13 17:45:15,135 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-13 17:45:15,135 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-13 17:45:15,135 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-13 17:45:15,135 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-13 17:45:15,135 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-13 17:45:15,155 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2019-10-13 17:45:15,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-13 17:45:15,162 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:15,164 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:15,166 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:15,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:15,174 INFO L82 PathProgramCache]: Analyzing trace with hash 1001985310, now seen corresponding path program 1 times [2019-10-13 17:45:15,192 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:15,193 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [58687599] [2019-10-13 17:45:15,193 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:15,193 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:15,193 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:15,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:15,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:15,369 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 17:45:15,372 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [58687599] [2019-10-13 17:45:15,373 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:45:15,373 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-13 17:45:15,374 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855331008] [2019-10-13 17:45:15,379 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-13 17:45:15,380 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:15,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-13 17:45:15,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-13 17:45:15,400 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 3 states. [2019-10-13 17:45:15,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:15,518 INFO L93 Difference]: Finished difference Result 51 states and 66 transitions. [2019-10-13 17:45:15,519 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 17:45:15,521 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2019-10-13 17:45:15,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:15,532 INFO L225 Difference]: With dead ends: 51 [2019-10-13 17:45:15,532 INFO L226 Difference]: Without dead ends: 24 [2019-10-13 17:45:15,537 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 17:45:15,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-10-13 17:45:15,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-10-13 17:45:15,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-10-13 17:45:15,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2019-10-13 17:45:15,588 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 17 [2019-10-13 17:45:15,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:15,589 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2019-10-13 17:45:15,589 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-13 17:45:15,589 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2019-10-13 17:45:15,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-13 17:45:15,591 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:15,591 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:15,591 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:15,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:15,592 INFO L82 PathProgramCache]: Analyzing trace with hash -400143846, now seen corresponding path program 1 times [2019-10-13 17:45:15,592 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:15,593 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1896822932] [2019-10-13 17:45:15,593 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:15,593 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:15,594 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:15,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:15,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:15,717 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 17:45:15,719 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1896822932] [2019-10-13 17:45:15,720 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:45:15,720 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-13 17:45:15,720 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101542189] [2019-10-13 17:45:15,722 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 17:45:15,723 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:15,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 17:45:15,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:45:15,724 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand 4 states. [2019-10-13 17:45:15,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:15,860 INFO L93 Difference]: Finished difference Result 46 states and 54 transitions. [2019-10-13 17:45:15,861 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 17:45:15,861 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 17 [2019-10-13 17:45:15,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:15,862 INFO L225 Difference]: With dead ends: 46 [2019-10-13 17:45:15,863 INFO L226 Difference]: Without dead ends: 29 [2019-10-13 17:45:15,864 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 17:45:15,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-10-13 17:45:15,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2019-10-13 17:45:15,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-10-13 17:45:15,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2019-10-13 17:45:15,879 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 17 [2019-10-13 17:45:15,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:15,879 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2019-10-13 17:45:15,880 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 17:45:15,880 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2019-10-13 17:45:15,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-10-13 17:45:15,883 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:15,884 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:15,884 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:15,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:15,886 INFO L82 PathProgramCache]: Analyzing trace with hash -1150570790, now seen corresponding path program 1 times [2019-10-13 17:45:15,887 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:15,887 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1841283780] [2019-10-13 17:45:15,888 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:15,888 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:15,888 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:15,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:16,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:16,050 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-13 17:45:16,051 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1841283780] [2019-10-13 17:45:16,051 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1296969848] [2019-10-13 17:45:16,052 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 17:45:16,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:16,122 INFO L256 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-13 17:45:16,135 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:16,183 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-13 17:45:16,185 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:16,186 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-10-13 17:45:16,186 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410974844] [2019-10-13 17:45:16,188 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-13 17:45:16,189 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:16,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-13 17:45:16,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-13 17:45:16,196 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand 6 states. [2019-10-13 17:45:16,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:16,303 INFO L93 Difference]: Finished difference Result 53 states and 61 transitions. [2019-10-13 17:45:16,304 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-13 17:45:16,304 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2019-10-13 17:45:16,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:16,305 INFO L225 Difference]: With dead ends: 53 [2019-10-13 17:45:16,305 INFO L226 Difference]: Without dead ends: 34 [2019-10-13 17:45:16,306 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 23 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 17:45:16,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-10-13 17:45:16,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2019-10-13 17:45:16,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-10-13 17:45:16,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2019-10-13 17:45:16,314 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 22 [2019-10-13 17:45:16,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:16,314 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2019-10-13 17:45:16,314 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-13 17:45:16,314 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2019-10-13 17:45:16,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-13 17:45:16,315 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:16,316 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:16,519 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:16,520 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:16,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:16,521 INFO L82 PathProgramCache]: Analyzing trace with hash -1868122094, now seen corresponding path program 2 times [2019-10-13 17:45:16,521 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:16,522 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1285037497] [2019-10-13 17:45:16,522 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:16,523 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:16,523 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:16,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:16,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:16,630 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-10-13 17:45:16,631 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1285037497] [2019-10-13 17:45:16,631 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [701847328] [2019-10-13 17:45:16,631 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 17:45:16,686 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:45:16,686 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:16,687 INFO L256 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-13 17:45:16,689 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:16,702 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-10-13 17:45:16,703 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:16,703 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-10-13 17:45:16,703 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579130650] [2019-10-13 17:45:16,704 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-13 17:45:16,704 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:16,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-13 17:45:16,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-13 17:45:16,705 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 7 states. [2019-10-13 17:45:16,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:16,824 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2019-10-13 17:45:16,825 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-13 17:45:16,825 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 27 [2019-10-13 17:45:16,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:16,826 INFO L225 Difference]: With dead ends: 62 [2019-10-13 17:45:16,826 INFO L226 Difference]: Without dead ends: 39 [2019-10-13 17:45:16,827 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 28 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 17:45:16,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-10-13 17:45:16,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2019-10-13 17:45:16,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-10-13 17:45:16,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2019-10-13 17:45:16,835 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 27 [2019-10-13 17:45:16,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:16,835 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2019-10-13 17:45:16,835 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-13 17:45:16,835 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2019-10-13 17:45:16,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-10-13 17:45:16,836 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:16,837 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:17,041 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:17,042 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:17,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:17,043 INFO L82 PathProgramCache]: Analyzing trace with hash 150752210, now seen corresponding path program 3 times [2019-10-13 17:45:17,043 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:17,044 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [134744485] [2019-10-13 17:45:17,044 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:17,044 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:17,044 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:17,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:17,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:17,160 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-10-13 17:45:17,161 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [134744485] [2019-10-13 17:45:17,161 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1253492627] [2019-10-13 17:45:17,161 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 17:45:17,212 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-13 17:45:17,212 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:17,213 INFO L256 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-13 17:45:17,215 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:17,229 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-10-13 17:45:17,230 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:17,230 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-10-13 17:45:17,230 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1078164854] [2019-10-13 17:45:17,231 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-13 17:45:17,231 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:17,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-13 17:45:17,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-13 17:45:17,232 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 8 states. [2019-10-13 17:45:17,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:17,356 INFO L93 Difference]: Finished difference Result 71 states and 79 transitions. [2019-10-13 17:45:17,356 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-13 17:45:17,357 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 32 [2019-10-13 17:45:17,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:17,358 INFO L225 Difference]: With dead ends: 71 [2019-10-13 17:45:17,358 INFO L226 Difference]: Without dead ends: 44 [2019-10-13 17:45:17,359 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 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 17:45:17,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-10-13 17:45:17,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2019-10-13 17:45:17,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-10-13 17:45:17,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2019-10-13 17:45:17,366 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 32 [2019-10-13 17:45:17,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:17,366 INFO L462 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2019-10-13 17:45:17,366 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-13 17:45:17,366 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2019-10-13 17:45:17,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-10-13 17:45:17,368 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:17,368 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:17,572 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:17,572 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:17,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:17,573 INFO L82 PathProgramCache]: Analyzing trace with hash -125121014, now seen corresponding path program 4 times [2019-10-13 17:45:17,573 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:17,573 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2020279454] [2019-10-13 17:45:17,573 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:17,573 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:17,574 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:17,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:17,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:17,691 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2019-10-13 17:45:17,691 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2020279454] [2019-10-13 17:45:17,691 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1592562242] [2019-10-13 17:45:17,691 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 17:45:17,742 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:45:17,743 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:17,744 INFO L256 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-13 17:45:17,747 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:17,764 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-10-13 17:45:17,764 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:17,765 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-10-13 17:45:17,765 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705806481] [2019-10-13 17:45:17,765 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-13 17:45:17,766 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:17,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-13 17:45:17,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-13 17:45:17,766 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand 9 states. [2019-10-13 17:45:17,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:17,887 INFO L93 Difference]: Finished difference Result 80 states and 88 transitions. [2019-10-13 17:45:17,888 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-13 17:45:17,888 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2019-10-13 17:45:17,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:17,889 INFO L225 Difference]: With dead ends: 80 [2019-10-13 17:45:17,889 INFO L226 Difference]: Without dead ends: 49 [2019-10-13 17:45:17,890 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 38 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 17:45:17,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-10-13 17:45:17,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2019-10-13 17:45:17,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-10-13 17:45:17,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 50 transitions. [2019-10-13 17:45:17,899 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 50 transitions. Word has length 37 [2019-10-13 17:45:17,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:17,900 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 50 transitions. [2019-10-13 17:45:17,900 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-13 17:45:17,900 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 50 transitions. [2019-10-13 17:45:17,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-10-13 17:45:17,902 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:17,903 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:18,107 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:18,107 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:18,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:18,108 INFO L82 PathProgramCache]: Analyzing trace with hash -1558523702, now seen corresponding path program 5 times [2019-10-13 17:45:18,108 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:18,108 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404287333] [2019-10-13 17:45:18,108 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:18,108 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:18,108 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:18,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:18,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:18,235 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2019-10-13 17:45:18,235 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404287333] [2019-10-13 17:45:18,236 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1560393880] [2019-10-13 17:45:18,236 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 17:45:18,563 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-10-13 17:45:18,563 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:18,565 INFO L256 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-13 17:45:18,568 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:18,620 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2019-10-13 17:45:18,621 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:18,621 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-10-13 17:45:18,621 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658130065] [2019-10-13 17:45:18,622 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-13 17:45:18,626 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:18,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-13 17:45:18,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-13 17:45:18,627 INFO L87 Difference]: Start difference. First operand 47 states and 50 transitions. Second operand 10 states. [2019-10-13 17:45:18,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:18,775 INFO L93 Difference]: Finished difference Result 89 states and 97 transitions. [2019-10-13 17:45:18,775 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-13 17:45:18,775 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 42 [2019-10-13 17:45:18,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:18,776 INFO L225 Difference]: With dead ends: 89 [2019-10-13 17:45:18,776 INFO L226 Difference]: Without dead ends: 54 [2019-10-13 17:45:18,777 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 43 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 17:45:18,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-10-13 17:45:18,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2019-10-13 17:45:18,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-10-13 17:45:18,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 55 transitions. [2019-10-13 17:45:18,784 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 55 transitions. Word has length 42 [2019-10-13 17:45:18,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:18,784 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 55 transitions. [2019-10-13 17:45:18,784 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-13 17:45:18,785 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 55 transitions. [2019-10-13 17:45:18,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-10-13 17:45:18,786 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:18,786 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:18,991 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:18,992 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:18,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:18,992 INFO L82 PathProgramCache]: Analyzing trace with hash -1349350398, now seen corresponding path program 6 times [2019-10-13 17:45:18,993 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:18,993 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2073267079] [2019-10-13 17:45:18,993 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:18,994 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:18,994 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:19,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:19,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:19,117 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2019-10-13 17:45:19,118 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2073267079] [2019-10-13 17:45:19,118 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1519446869] [2019-10-13 17:45:19,118 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 17:45:19,334 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-10-13 17:45:19,334 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:19,336 INFO L256 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-13 17:45:19,339 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:19,356 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2019-10-13 17:45:19,356 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:19,357 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-10-13 17:45:19,357 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924310737] [2019-10-13 17:45:19,358 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-13 17:45:19,358 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:19,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-13 17:45:19,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-13 17:45:19,359 INFO L87 Difference]: Start difference. First operand 52 states and 55 transitions. Second operand 11 states. [2019-10-13 17:45:19,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:19,532 INFO L93 Difference]: Finished difference Result 98 states and 106 transitions. [2019-10-13 17:45:19,532 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-13 17:45:19,532 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 47 [2019-10-13 17:45:19,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:19,533 INFO L225 Difference]: With dead ends: 98 [2019-10-13 17:45:19,533 INFO L226 Difference]: Without dead ends: 59 [2019-10-13 17:45:19,534 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 48 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 17:45:19,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-10-13 17:45:19,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 57. [2019-10-13 17:45:19,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2019-10-13 17:45:19,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2019-10-13 17:45:19,541 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 47 [2019-10-13 17:45:19,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:19,541 INFO L462 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2019-10-13 17:45:19,542 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-13 17:45:19,542 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2019-10-13 17:45:19,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-10-13 17:45:19,543 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:19,543 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:19,744 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:19,744 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:19,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:19,745 INFO L82 PathProgramCache]: Analyzing trace with hash -1128841790, now seen corresponding path program 7 times [2019-10-13 17:45:19,745 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:19,746 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1215745033] [2019-10-13 17:45:19,746 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:19,746 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:19,746 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:19,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:19,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:19,876 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2019-10-13 17:45:19,877 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1215745033] [2019-10-13 17:45:19,877 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [425256835] [2019-10-13 17:45:19,877 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 17:45:19,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:19,940 INFO L256 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-13 17:45:19,943 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:19,964 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2019-10-13 17:45:19,964 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:19,964 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-10-13 17:45:19,965 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [515943984] [2019-10-13 17:45:19,968 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-13 17:45:19,968 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:19,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-13 17:45:19,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-13 17:45:19,969 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 12 states. [2019-10-13 17:45:20,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:20,141 INFO L93 Difference]: Finished difference Result 107 states and 115 transitions. [2019-10-13 17:45:20,142 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-13 17:45:20,142 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 52 [2019-10-13 17:45:20,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:20,143 INFO L225 Difference]: With dead ends: 107 [2019-10-13 17:45:20,144 INFO L226 Difference]: Without dead ends: 64 [2019-10-13 17:45:20,144 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 53 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 17:45:20,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-10-13 17:45:20,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 62. [2019-10-13 17:45:20,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2019-10-13 17:45:20,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 65 transitions. [2019-10-13 17:45:20,151 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 65 transitions. Word has length 52 [2019-10-13 17:45:20,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:20,151 INFO L462 AbstractCegarLoop]: Abstraction has 62 states and 65 transitions. [2019-10-13 17:45:20,151 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-13 17:45:20,152 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 65 transitions. [2019-10-13 17:45:20,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-10-13 17:45:20,154 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:20,154 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:20,355 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:20,356 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:20,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:20,357 INFO L82 PathProgramCache]: Analyzing trace with hash -612503046, now seen corresponding path program 8 times [2019-10-13 17:45:20,357 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:20,358 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1859618672] [2019-10-13 17:45:20,358 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:20,358 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:20,358 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:20,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:20,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:20,477 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2019-10-13 17:45:20,478 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1859618672] [2019-10-13 17:45:20,478 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1159560131] [2019-10-13 17:45:20,478 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 17:45:20,527 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:45:20,527 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:20,528 INFO L256 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-13 17:45:20,531 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:20,556 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2019-10-13 17:45:20,556 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:20,556 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-10-13 17:45:20,557 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601372858] [2019-10-13 17:45:20,560 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-13 17:45:20,560 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:20,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-13 17:45:20,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-13 17:45:20,561 INFO L87 Difference]: Start difference. First operand 62 states and 65 transitions. Second operand 13 states. [2019-10-13 17:45:20,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:20,691 INFO L93 Difference]: Finished difference Result 116 states and 124 transitions. [2019-10-13 17:45:20,692 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-13 17:45:20,692 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 57 [2019-10-13 17:45:20,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:20,693 INFO L225 Difference]: With dead ends: 116 [2019-10-13 17:45:20,693 INFO L226 Difference]: Without dead ends: 69 [2019-10-13 17:45:20,694 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-13 17:45:20,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2019-10-13 17:45:20,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 67. [2019-10-13 17:45:20,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2019-10-13 17:45:20,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2019-10-13 17:45:20,702 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 57 [2019-10-13 17:45:20,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:20,702 INFO L462 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2019-10-13 17:45:20,702 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-13 17:45:20,702 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2019-10-13 17:45:20,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2019-10-13 17:45:20,703 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:20,703 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:20,918 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:20,918 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:20,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:20,919 INFO L82 PathProgramCache]: Analyzing trace with hash -490630470, now seen corresponding path program 9 times [2019-10-13 17:45:20,919 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:20,920 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1780487871] [2019-10-13 17:45:20,920 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:20,920 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:20,920 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:20,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:21,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:21,099 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2019-10-13 17:45:21,100 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1780487871] [2019-10-13 17:45:21,100 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2068936074] [2019-10-13 17:45:21,100 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 17:45:21,442 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-10-13 17:45:21,442 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:21,444 INFO L256 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-13 17:45:21,447 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:21,461 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2019-10-13 17:45:21,462 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:21,462 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2019-10-13 17:45:21,462 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678586160] [2019-10-13 17:45:21,463 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-13 17:45:21,463 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:21,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-13 17:45:21,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-13 17:45:21,464 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 14 states. [2019-10-13 17:45:21,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:21,639 INFO L93 Difference]: Finished difference Result 125 states and 133 transitions. [2019-10-13 17:45:21,639 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-13 17:45:21,639 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 62 [2019-10-13 17:45:21,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:21,640 INFO L225 Difference]: With dead ends: 125 [2019-10-13 17:45:21,640 INFO L226 Difference]: Without dead ends: 74 [2019-10-13 17:45:21,641 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-13 17:45:21,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-10-13 17:45:21,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 72. [2019-10-13 17:45:21,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2019-10-13 17:45:21,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 75 transitions. [2019-10-13 17:45:21,649 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 75 transitions. Word has length 62 [2019-10-13 17:45:21,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:21,649 INFO L462 AbstractCegarLoop]: Abstraction has 72 states and 75 transitions. [2019-10-13 17:45:21,649 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-13 17:45:21,650 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 75 transitions. [2019-10-13 17:45:21,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2019-10-13 17:45:21,651 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:21,651 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:21,854 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:21,855 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:21,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:21,856 INFO L82 PathProgramCache]: Analyzing trace with hash -1207107598, now seen corresponding path program 10 times [2019-10-13 17:45:21,856 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:21,857 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [535096834] [2019-10-13 17:45:21,857 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:21,857 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:21,857 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:21,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:21,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:22,000 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2019-10-13 17:45:22,001 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [535096834] [2019-10-13 17:45:22,001 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1599580498] [2019-10-13 17:45:22,001 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 17:45:22,062 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:45:22,062 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:22,063 INFO L256 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-13 17:45:22,066 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:22,091 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2019-10-13 17:45:22,092 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:22,092 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-10-13 17:45:22,092 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084764670] [2019-10-13 17:45:22,093 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-13 17:45:22,093 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:22,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-13 17:45:22,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-13 17:45:22,094 INFO L87 Difference]: Start difference. First operand 72 states and 75 transitions. Second operand 15 states. [2019-10-13 17:45:22,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:22,250 INFO L93 Difference]: Finished difference Result 134 states and 142 transitions. [2019-10-13 17:45:22,250 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-13 17:45:22,250 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 67 [2019-10-13 17:45:22,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:22,251 INFO L225 Difference]: With dead ends: 134 [2019-10-13 17:45:22,251 INFO L226 Difference]: Without dead ends: 79 [2019-10-13 17:45:22,252 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-13 17:45:22,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2019-10-13 17:45:22,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 77. [2019-10-13 17:45:22,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2019-10-13 17:45:22,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2019-10-13 17:45:22,259 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 67 [2019-10-13 17:45:22,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:22,259 INFO L462 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2019-10-13 17:45:22,259 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-13 17:45:22,260 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2019-10-13 17:45:22,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2019-10-13 17:45:22,261 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:22,261 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:22,474 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:22,474 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:22,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:22,475 INFO L82 PathProgramCache]: Analyzing trace with hash 2083114930, now seen corresponding path program 11 times [2019-10-13 17:45:22,475 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:22,475 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [992055080] [2019-10-13 17:45:22,475 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:22,476 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:22,476 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:22,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:22,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:22,651 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2019-10-13 17:45:22,651 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [992055080] [2019-10-13 17:45:22,652 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1126426102] [2019-10-13 17:45:22,652 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 17:45:56,253 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-10-13 17:45:56,254 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:56,289 INFO L256 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-13 17:45:56,292 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:56,318 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2019-10-13 17:45:56,318 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:56,318 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-10-13 17:45:56,319 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241002584] [2019-10-13 17:45:56,321 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-13 17:45:56,321 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:56,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-13 17:45:56,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-13 17:45:56,322 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 16 states. [2019-10-13 17:45:56,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:56,528 INFO L93 Difference]: Finished difference Result 143 states and 151 transitions. [2019-10-13 17:45:56,528 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-13 17:45:56,528 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 72 [2019-10-13 17:45:56,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:56,529 INFO L225 Difference]: With dead ends: 143 [2019-10-13 17:45:56,530 INFO L226 Difference]: Without dead ends: 84 [2019-10-13 17:45:56,530 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 73 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 17:45:56,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2019-10-13 17:45:56,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 82. [2019-10-13 17:45:56,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2019-10-13 17:45:56,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 85 transitions. [2019-10-13 17:45:56,537 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 85 transitions. Word has length 72 [2019-10-13 17:45:56,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:56,537 INFO L462 AbstractCegarLoop]: Abstraction has 82 states and 85 transitions. [2019-10-13 17:45:56,537 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-13 17:45:56,537 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 85 transitions. [2019-10-13 17:45:56,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2019-10-13 17:45:56,539 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:56,539 INFO L380 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:56,751 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:56,752 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:56,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:56,753 INFO L82 PathProgramCache]: Analyzing trace with hash 385857002, now seen corresponding path program 12 times [2019-10-13 17:45:56,753 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:56,753 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [918023807] [2019-10-13 17:45:56,754 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:56,754 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:56,754 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:56,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:56,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:56,958 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-10-13 17:45:56,959 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [918023807] [2019-10-13 17:45:56,959 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [696242586] [2019-10-13 17:45:56,959 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