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_init2_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 21:44:27,193 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 21:44:27,195 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 21:44:27,208 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 21:44:27,209 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 21:44:27,210 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 21:44:27,211 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 21:44:27,213 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 21:44:27,215 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 21:44:27,216 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 21:44:27,217 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 21:44:27,218 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 21:44:27,218 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 21:44:27,219 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 21:44:27,220 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 21:44:27,222 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 21:44:27,222 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 21:44:27,223 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 21:44:27,225 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 21:44:27,227 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 21:44:27,229 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 21:44:27,230 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 21:44:27,232 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 21:44:27,232 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 21:44:27,238 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-14 21:44:27,243 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 21:44:27,247 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 21:44:27,248 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 21:44:27,249 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 21:44:27,250 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 21:44:27,250 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 21:44:27,251 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 21:44:27,251 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 21:44:27,254 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 21:44:27,256 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 21:44:27,259 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 21:44:27,260 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-14 21:44:27,279 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 21:44:27,279 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 21:44:27,281 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 21:44:27,281 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 21:44:27,281 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 21:44:27,282 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 21:44:27,282 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 21:44:27,282 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 21:44:27,282 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 21:44:27,282 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 21:44:27,283 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 21:44:27,283 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 21:44:27,283 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 21:44:27,283 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 21:44:27,283 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 21:44:27,284 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 21:44:27,284 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 21:44:27,284 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 21:44:27,284 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 21:44:27,285 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 21:44:27,285 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 21:44:27,285 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:44:27,285 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 21:44:27,285 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 21:44:27,286 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 21:44:27,286 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 21:44:27,286 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 21:44:27,286 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 21:44:27,286 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 21:44:27,571 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 21:44:27,584 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 21:44:27,587 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 21:44:27,589 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 21:44:27,589 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 21:44:27,590 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_init2_ground-2.i [2019-10-14 21:44:27,664 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2ecde6ab1/4ad5778289f24e37a6677c6b015bc879/FLAGddb0651d1 [2019-10-14 21:44:28,143 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 21:44:28,144 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_init2_ground-2.i [2019-10-14 21:44:28,151 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2ecde6ab1/4ad5778289f24e37a6677c6b015bc879/FLAGddb0651d1 [2019-10-14 21:44:28,513 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2ecde6ab1/4ad5778289f24e37a6677c6b015bc879 [2019-10-14 21:44:28,523 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 21:44:28,525 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 21:44:28,526 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 21:44:28,526 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 21:44:28,530 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 21:44:28,531 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:44:28" (1/1) ... [2019-10-14 21:44:28,534 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5b840ab9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:28, skipping insertion in model container [2019-10-14 21:44:28,535 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:44:28" (1/1) ... [2019-10-14 21:44:28,542 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 21:44:28,560 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 21:44:28,773 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:44:28,783 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 21:44:28,800 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:44:28,821 INFO L192 MainTranslator]: Completed translation [2019-10-14 21:44:28,822 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:28 WrapperNode [2019-10-14 21:44:28,822 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 21:44:28,822 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 21:44:28,823 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 21:44:28,823 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 21:44:28,919 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:28" (1/1) ... [2019-10-14 21:44:28,919 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:28" (1/1) ... [2019-10-14 21:44:28,928 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:28" (1/1) ... [2019-10-14 21:44:28,930 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:28" (1/1) ... [2019-10-14 21:44:28,944 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:28" (1/1) ... [2019-10-14 21:44:28,950 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:28" (1/1) ... [2019-10-14 21:44:28,952 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:28" (1/1) ... [2019-10-14 21:44:28,954 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 21:44:28,954 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 21:44:28,955 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 21:44:28,955 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 21:44:28,956 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:28" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:44:29,012 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 21:44:29,012 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 21:44:29,012 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 21:44:29,012 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 21:44:29,012 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 21:44:29,013 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 21:44:29,013 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 21:44:29,013 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-14 21:44:29,013 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-14 21:44:29,013 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-14 21:44:29,013 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-14 21:44:29,014 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 21:44:29,014 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 21:44:29,262 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 21:44:29,262 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-10-14 21:44:29,264 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:44:29 BoogieIcfgContainer [2019-10-14 21:44:29,264 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 21:44:29,274 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 21:44:29,275 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 21:44:29,281 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 21:44:29,282 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 09:44:28" (1/3) ... [2019-10-14 21:44:29,283 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e91f6a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:44:29, skipping insertion in model container [2019-10-14 21:44:29,283 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:28" (2/3) ... [2019-10-14 21:44:29,283 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e91f6a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:44:29, skipping insertion in model container [2019-10-14 21:44:29,283 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:44:29" (3/3) ... [2019-10-14 21:44:29,285 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_init2_ground-2.i [2019-10-14 21:44:29,309 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 21:44:29,325 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 21:44:29,352 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 21:44:29,378 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 21:44:29,379 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 21:44:29,379 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 21:44:29,379 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 21:44:29,379 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 21:44:29,379 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 21:44:29,379 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 21:44:29,380 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 21:44:29,398 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2019-10-14 21:44:29,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-14 21:44:29,405 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:29,406 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:29,407 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:29,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:29,412 INFO L82 PathProgramCache]: Analyzing trace with hash 2104113866, now seen corresponding path program 1 times [2019-10-14 21:44:29,419 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:29,419 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1005531611] [2019-10-14 21:44:29,420 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:29,420 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:29,420 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:29,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:29,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:29,584 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:44:29,585 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1005531611] [2019-10-14 21:44:29,586 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:44:29,586 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-14 21:44:29,587 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979120423] [2019-10-14 21:44:29,591 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 21:44:29,592 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:29,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 21:44:29,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:44:29,610 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2019-10-14 21:44:29,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:29,709 INFO L93 Difference]: Finished difference Result 43 states and 54 transitions. [2019-10-14 21:44:29,710 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 21:44:29,711 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2019-10-14 21:44:29,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:29,723 INFO L225 Difference]: With dead ends: 43 [2019-10-14 21:44:29,723 INFO L226 Difference]: Without dead ends: 20 [2019-10-14 21:44:29,731 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:44:29,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-10-14 21:44:29,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-10-14 21:44:29,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-10-14 21:44:29,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2019-10-14 21:44:29,771 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 15 [2019-10-14 21:44:29,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:29,771 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2019-10-14 21:44:29,771 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 21:44:29,772 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2019-10-14 21:44:29,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-14 21:44:29,773 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:29,773 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:29,773 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:29,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:29,774 INFO L82 PathProgramCache]: Analyzing trace with hash 743997126, now seen corresponding path program 1 times [2019-10-14 21:44:29,774 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:29,775 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [71527289] [2019-10-14 21:44:29,775 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:29,775 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:29,776 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:29,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:29,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:29,862 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:44:29,862 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [71527289] [2019-10-14 21:44:29,863 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:44:29,863 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:44:29,863 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [9751868] [2019-10-14 21:44:29,865 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:44:29,865 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:29,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:44:29,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:44:29,866 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 4 states. [2019-10-14 21:44:29,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:29,957 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2019-10-14 21:44:29,957 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:44:29,958 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2019-10-14 21:44:29,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:29,959 INFO L225 Difference]: With dead ends: 35 [2019-10-14 21:44:29,960 INFO L226 Difference]: Without dead ends: 22 [2019-10-14 21:44:29,961 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:44:29,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-10-14 21:44:29,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-10-14 21:44:29,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-10-14 21:44:29,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2019-10-14 21:44:29,975 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 15 [2019-10-14 21:44:29,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:29,976 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2019-10-14 21:44:29,976 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:44:29,976 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2019-10-14 21:44:29,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-14 21:44:29,978 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:29,978 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:29,979 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:29,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:29,980 INFO L82 PathProgramCache]: Analyzing trace with hash 494025381, now seen corresponding path program 1 times [2019-10-14 21:44:29,981 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:29,981 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2130471295] [2019-10-14 21:44:29,982 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:29,982 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:29,982 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:30,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:30,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:30,092 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 21:44:30,092 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2130471295] [2019-10-14 21:44:30,092 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1457460255] [2019-10-14 21:44:30,093 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:30,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:30,150 INFO L256 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 21:44:30,156 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:30,184 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 21:44:30,184 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:30,184 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-10-14 21:44:30,185 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176585049] [2019-10-14 21:44:30,185 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-14 21:44:30,185 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:30,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-14 21:44:30,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:44:30,186 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 6 states. [2019-10-14 21:44:30,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:30,299 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2019-10-14 21:44:30,300 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-14 21:44:30,300 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2019-10-14 21:44:30,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:30,301 INFO L225 Difference]: With dead ends: 38 [2019-10-14 21:44:30,302 INFO L226 Difference]: Without dead ends: 24 [2019-10-14 21:44:30,302 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:44:30,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-10-14 21:44:30,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-10-14 21:44:30,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-10-14 21:44:30,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2019-10-14 21:44:30,315 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2019-10-14 21:44:30,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:30,315 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2019-10-14 21:44:30,315 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-14 21:44:30,315 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2019-10-14 21:44:30,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-10-14 21:44:30,317 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:30,317 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:30,521 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:30,521 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:30,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:30,522 INFO L82 PathProgramCache]: Analyzing trace with hash -254426330, now seen corresponding path program 2 times [2019-10-14 21:44:30,523 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:30,523 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [705432953] [2019-10-14 21:44:30,524 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:30,524 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:30,524 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:30,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:30,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:30,647 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-14 21:44:30,648 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [705432953] [2019-10-14 21:44:30,648 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2142207378] [2019-10-14 21:44:30,649 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:30,706 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:44:30,707 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:30,708 INFO L256 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 21:44:30,710 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:30,729 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-14 21:44:30,729 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:30,729 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-10-14 21:44:30,730 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192774511] [2019-10-14 21:44:30,730 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-14 21:44:30,731 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:30,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-14 21:44:30,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:44:30,733 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 7 states. [2019-10-14 21:44:30,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:30,838 INFO L93 Difference]: Finished difference Result 41 states and 46 transitions. [2019-10-14 21:44:30,839 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 21:44:30,839 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2019-10-14 21:44:30,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:30,840 INFO L225 Difference]: With dead ends: 41 [2019-10-14 21:44:30,840 INFO L226 Difference]: Without dead ends: 26 [2019-10-14 21:44:30,841 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:44:30,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-10-14 21:44:30,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-10-14 21:44:30,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-10-14 21:44:30,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2019-10-14 21:44:30,846 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2019-10-14 21:44:30,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:30,847 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2019-10-14 21:44:30,847 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-14 21:44:30,847 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2019-10-14 21:44:30,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-14 21:44:30,848 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:30,848 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:31,049 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:31,050 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:31,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:31,050 INFO L82 PathProgramCache]: Analyzing trace with hash -254217403, now seen corresponding path program 3 times [2019-10-14 21:44:31,051 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:31,051 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1882731396] [2019-10-14 21:44:31,052 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:31,052 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:31,052 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:31,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:31,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:31,143 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-14 21:44:31,144 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1882731396] [2019-10-14 21:44:31,144 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1373600184] [2019-10-14 21:44:31,144 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:31,190 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-14 21:44:31,190 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:31,191 INFO L256 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-14 21:44:31,192 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:31,205 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-14 21:44:31,205 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:31,205 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-10-14 21:44:31,206 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1453778892] [2019-10-14 21:44:31,206 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-14 21:44:31,206 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:31,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-14 21:44:31,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:44:31,207 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 8 states. [2019-10-14 21:44:31,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:31,291 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2019-10-14 21:44:31,291 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-14 21:44:31,291 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2019-10-14 21:44:31,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:31,292 INFO L225 Difference]: With dead ends: 44 [2019-10-14 21:44:31,293 INFO L226 Difference]: Without dead ends: 28 [2019-10-14 21:44:31,293 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:44:31,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-10-14 21:44:31,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2019-10-14 21:44:31,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-14 21:44:31,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2019-10-14 21:44:31,299 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 21 [2019-10-14 21:44:31,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:31,300 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2019-10-14 21:44:31,300 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-14 21:44:31,300 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2019-10-14 21:44:31,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-10-14 21:44:31,301 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:31,301 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:31,502 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:31,503 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:31,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:31,503 INFO L82 PathProgramCache]: Analyzing trace with hash 1902727046, now seen corresponding path program 4 times [2019-10-14 21:44:31,504 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:31,504 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1708856884] [2019-10-14 21:44:31,504 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:31,505 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:31,505 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:31,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:31,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:31,631 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-14 21:44:31,632 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1708856884] [2019-10-14 21:44:31,632 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2061060627] [2019-10-14 21:44:31,632 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:31,678 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:44:31,678 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:31,680 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-14 21:44:31,681 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:31,699 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-14 21:44:31,700 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:31,700 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-10-14 21:44:31,700 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806811888] [2019-10-14 21:44:31,701 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 21:44:31,701 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:31,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 21:44:31,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:44:31,702 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 9 states. [2019-10-14 21:44:31,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:31,808 INFO L93 Difference]: Finished difference Result 47 states and 52 transitions. [2019-10-14 21:44:31,809 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-14 21:44:31,809 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2019-10-14 21:44:31,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:31,810 INFO L225 Difference]: With dead ends: 47 [2019-10-14 21:44:31,810 INFO L226 Difference]: Without dead ends: 30 [2019-10-14 21:44:31,811 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:44:31,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-10-14 21:44:31,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2019-10-14 21:44:31,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-10-14 21:44:31,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2019-10-14 21:44:31,822 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 23 [2019-10-14 21:44:31,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:31,823 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2019-10-14 21:44:31,823 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 21:44:31,823 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2019-10-14 21:44:31,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-10-14 21:44:31,825 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:31,825 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:32,025 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:32,026 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:32,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:32,026 INFO L82 PathProgramCache]: Analyzing trace with hash 768730085, now seen corresponding path program 5 times [2019-10-14 21:44:32,027 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:32,027 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2080721541] [2019-10-14 21:44:32,027 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:32,027 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:32,027 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:32,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:32,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:32,144 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-10-14 21:44:32,144 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2080721541] [2019-10-14 21:44:32,145 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [826274338] [2019-10-14 21:44:32,145 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:32,216 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2019-10-14 21:44:32,217 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:32,218 INFO L256 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 21:44:32,220 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:32,247 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-10-14 21:44:32,248 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:32,248 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-10-14 21:44:32,248 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241973576] [2019-10-14 21:44:32,248 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-14 21:44:32,249 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:32,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-14 21:44:32,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:44:32,250 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 10 states. [2019-10-14 21:44:32,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:32,351 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2019-10-14 21:44:32,352 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-14 21:44:32,352 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 25 [2019-10-14 21:44:32,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:32,353 INFO L225 Difference]: With dead ends: 50 [2019-10-14 21:44:32,353 INFO L226 Difference]: Without dead ends: 32 [2019-10-14 21:44:32,354 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:44:32,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-10-14 21:44:32,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2019-10-14 21:44:32,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-10-14 21:44:32,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2019-10-14 21:44:32,360 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 25 [2019-10-14 21:44:32,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:32,361 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2019-10-14 21:44:32,361 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-14 21:44:32,361 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2019-10-14 21:44:32,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-14 21:44:32,362 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:32,362 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:32,566 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:32,567 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:32,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:32,568 INFO L82 PathProgramCache]: Analyzing trace with hash 598811622, now seen corresponding path program 6 times [2019-10-14 21:44:32,568 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:32,569 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1451062102] [2019-10-14 21:44:32,569 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:32,569 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:32,570 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:32,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:32,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:32,688 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-14 21:44:32,688 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1451062102] [2019-10-14 21:44:32,688 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [510722652] [2019-10-14 21:44:32,689 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:32,766 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2019-10-14 21:44:32,766 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:32,768 INFO L256 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 21:44:32,772 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:32,815 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-14 21:44:32,816 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:32,816 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-10-14 21:44:32,816 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907534540] [2019-10-14 21:44:32,817 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-14 21:44:32,820 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:32,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-14 21:44:32,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:44:32,821 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 11 states. [2019-10-14 21:44:32,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:32,940 INFO L93 Difference]: Finished difference Result 53 states and 58 transitions. [2019-10-14 21:44:32,940 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-14 21:44:32,940 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 27 [2019-10-14 21:44:32,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:32,941 INFO L225 Difference]: With dead ends: 53 [2019-10-14 21:44:32,941 INFO L226 Difference]: Without dead ends: 34 [2019-10-14 21:44:32,942 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:44:32,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-10-14 21:44:32,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2019-10-14 21:44:32,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-10-14 21:44:32,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2019-10-14 21:44:32,954 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 27 [2019-10-14 21:44:32,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:32,955 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2019-10-14 21:44:32,955 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-14 21:44:32,955 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2019-10-14 21:44:32,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-10-14 21:44:32,958 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:32,958 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:33,159 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:33,160 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:33,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:33,160 INFO L82 PathProgramCache]: Analyzing trace with hash -1765864315, now seen corresponding path program 7 times [2019-10-14 21:44:33,160 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:33,161 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [744106829] [2019-10-14 21:44:33,161 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:33,161 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:33,161 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:33,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:33,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:33,283 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2019-10-14 21:44:33,284 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [744106829] [2019-10-14 21:44:33,284 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2133753085] [2019-10-14 21:44:33,284 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:33,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:33,335 INFO L256 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 21:44:33,337 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:33,359 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2019-10-14 21:44:33,360 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:33,360 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-10-14 21:44:33,360 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092295988] [2019-10-14 21:44:33,365 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-14 21:44:33,365 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:33,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-14 21:44:33,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:44:33,366 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 12 states. [2019-10-14 21:44:33,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:33,448 INFO L93 Difference]: Finished difference Result 56 states and 61 transitions. [2019-10-14 21:44:33,449 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-14 21:44:33,449 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 29 [2019-10-14 21:44:33,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:33,450 INFO L225 Difference]: With dead ends: 56 [2019-10-14 21:44:33,450 INFO L226 Difference]: Without dead ends: 36 [2019-10-14 21:44:33,450 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:44:33,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-10-14 21:44:33,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2019-10-14 21:44:33,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-10-14 21:44:33,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2019-10-14 21:44:33,460 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 29 [2019-10-14 21:44:33,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:33,460 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2019-10-14 21:44:33,460 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-14 21:44:33,460 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2019-10-14 21:44:33,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-10-14 21:44:33,461 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:33,461 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:33,666 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:33,666 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:33,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:33,667 INFO L82 PathProgramCache]: Analyzing trace with hash 97206342, now seen corresponding path program 8 times [2019-10-14 21:44:33,667 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:33,667 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1156023239] [2019-10-14 21:44:33,668 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:33,668 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:33,668 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:33,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:33,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:33,790 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-14 21:44:33,791 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1156023239] [2019-10-14 21:44:33,791 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [591154365] [2019-10-14 21:44:33,791 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:33,843 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:44:33,843 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:33,844 INFO L256 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 21:44:33,846 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:33,860 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-14 21:44:33,861 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:33,861 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-10-14 21:44:33,861 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001824976] [2019-10-14 21:44:33,862 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-14 21:44:33,862 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:33,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-14 21:44:33,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:44:33,863 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 13 states. [2019-10-14 21:44:33,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:33,977 INFO L93 Difference]: Finished difference Result 59 states and 64 transitions. [2019-10-14 21:44:33,977 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 21:44:33,978 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2019-10-14 21:44:33,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:33,979 INFO L225 Difference]: With dead ends: 59 [2019-10-14 21:44:33,979 INFO L226 Difference]: Without dead ends: 38 [2019-10-14 21:44:33,979 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:44:33,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-10-14 21:44:33,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2019-10-14 21:44:33,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-10-14 21:44:33,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2019-10-14 21:44:33,985 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 31 [2019-10-14 21:44:33,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:33,985 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2019-10-14 21:44:33,986 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-14 21:44:33,986 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2019-10-14 21:44:33,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-10-14 21:44:33,987 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:33,987 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:34,192 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:34,193 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:34,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:34,194 INFO L82 PathProgramCache]: Analyzing trace with hash 1434610981, now seen corresponding path program 9 times [2019-10-14 21:44:34,194 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:34,195 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2006384787] [2019-10-14 21:44:34,195 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:34,195 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:34,195 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:34,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:34,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:34,330 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-10-14 21:44:34,331 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2006384787] [2019-10-14 21:44:34,331 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2078630664] [2019-10-14 21:44:34,332 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:34,503 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-10-14 21:44:34,503 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:34,505 INFO L256 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-14 21:44:34,508 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:34,550 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-10-14 21:44:34,550 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:34,550 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2019-10-14 21:44:34,550 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421902037] [2019-10-14 21:44:34,552 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-14 21:44:34,552 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:34,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-14 21:44:34,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:44:34,555 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 14 states. [2019-10-14 21:44:34,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:34,672 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2019-10-14 21:44:34,672 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-14 21:44:34,672 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 33 [2019-10-14 21:44:34,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:34,673 INFO L225 Difference]: With dead ends: 62 [2019-10-14 21:44:34,673 INFO L226 Difference]: Without dead ends: 40 [2019-10-14 21:44:34,674 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:44:34,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-10-14 21:44:34,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2019-10-14 21:44:34,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-10-14 21:44:34,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2019-10-14 21:44:34,680 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 33 [2019-10-14 21:44:34,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:34,680 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2019-10-14 21:44:34,681 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-14 21:44:34,681 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2019-10-14 21:44:34,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-10-14 21:44:34,682 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:34,682 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:34,887 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:34,888 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:34,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:34,889 INFO L82 PathProgramCache]: Analyzing trace with hash 2119541926, now seen corresponding path program 10 times [2019-10-14 21:44:34,889 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:34,889 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [911972040] [2019-10-14 21:44:34,890 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:34,890 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:34,890 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:34,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:35,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:35,056 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-10-14 21:44:35,057 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [911972040] [2019-10-14 21:44:35,058 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1338868291] [2019-10-14 21:44:35,058 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:35,112 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:44:35,113 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:35,114 INFO L256 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 21:44:35,116 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:35,150 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-10-14 21:44:35,151 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:35,151 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-10-14 21:44:35,152 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193171679] [2019-10-14 21:44:35,152 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-14 21:44:35,153 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:35,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-14 21:44:35,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:44:35,156 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 15 states. [2019-10-14 21:44:35,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:35,285 INFO L93 Difference]: Finished difference Result 65 states and 70 transitions. [2019-10-14 21:44:35,285 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 21:44:35,285 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 35 [2019-10-14 21:44:35,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:35,286 INFO L225 Difference]: With dead ends: 65 [2019-10-14 21:44:35,286 INFO L226 Difference]: Without dead ends: 42 [2019-10-14 21:44:35,287 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:44:35,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-10-14 21:44:35,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2019-10-14 21:44:35,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-10-14 21:44:35,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2019-10-14 21:44:35,296 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 35 [2019-10-14 21:44:35,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:35,297 INFO L462 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2019-10-14 21:44:35,297 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-14 21:44:35,297 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2019-10-14 21:44:35,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-10-14 21:44:35,301 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:35,301 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:35,513 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:35,513 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:35,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:35,514 INFO L82 PathProgramCache]: Analyzing trace with hash 461243845, now seen corresponding path program 11 times [2019-10-14 21:44:35,514 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:35,514 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1393244747] [2019-10-14 21:44:35,514 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:35,514 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:35,514 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:35,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:35,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:35,664 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-10-14 21:44:35,664 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1393244747] [2019-10-14 21:44:35,665 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [458301298] [2019-10-14 21:44:35,665 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:36,655 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2019-10-14 21:44:36,655 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:36,658 INFO L256 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-14 21:44:36,661 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:36,683 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-10-14 21:44:36,683 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:36,684 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-10-14 21:44:36,684 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180070679] [2019-10-14 21:44:36,684 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-14 21:44:36,684 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:36,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-14 21:44:36,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-14 21:44:36,685 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 16 states. [2019-10-14 21:44:36,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:36,815 INFO L93 Difference]: Finished difference Result 68 states and 73 transitions. [2019-10-14 21:44:36,815 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-14 21:44:36,816 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 37 [2019-10-14 21:44:36,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:36,816 INFO L225 Difference]: With dead ends: 68 [2019-10-14 21:44:36,816 INFO L226 Difference]: Without dead ends: 44 [2019-10-14 21:44:36,817 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-14 21:44:36,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-10-14 21:44:36,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2019-10-14 21:44:36,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-10-14 21:44:36,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2019-10-14 21:44:36,834 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 37 [2019-10-14 21:44:36,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:36,835 INFO L462 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2019-10-14 21:44:36,835 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-14 21:44:36,835 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2019-10-14 21:44:36,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-10-14 21:44:36,835 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:36,836 INFO L380 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:37,041 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:37,041 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:37,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:37,042 INFO L82 PathProgramCache]: Analyzing trace with hash 1013862662, now seen corresponding path program 12 times [2019-10-14 21:44:37,042 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:37,042 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1620503280] [2019-10-14 21:44:37,042 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:37,043 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:37,043 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:37,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:37,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:37,189 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2019-10-14 21:44:37,190 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1620503280] [2019-10-14 21:44:37,190 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1241203438] [2019-10-14 21:44:37,190 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:37,505 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-10-14 21:44:37,505 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:37,507 INFO L256 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-14 21:44:37,509 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:37,529 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2019-10-14 21:44:37,530 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:37,530 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2019-10-14 21:44:37,530 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [632761498] [2019-10-14 21:44:37,531 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-14 21:44:37,531 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:37,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-14 21:44:37,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-10-14 21:44:37,532 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 17 states. [2019-10-14 21:44:37,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:37,664 INFO L93 Difference]: Finished difference Result 71 states and 76 transitions. [2019-10-14 21:44:37,665 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-10-14 21:44:37,665 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2019-10-14 21:44:37,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:37,666 INFO L225 Difference]: With dead ends: 71 [2019-10-14 21:44:37,666 INFO L226 Difference]: Without dead ends: 46 [2019-10-14 21:44:37,667 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-10-14 21:44:37,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-10-14 21:44:37,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2019-10-14 21:44:37,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-10-14 21:44:37,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2019-10-14 21:44:37,674 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 39 [2019-10-14 21:44:37,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:37,674 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2019-10-14 21:44:37,674 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-14 21:44:37,674 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2019-10-14 21:44:37,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2019-10-14 21:44:37,675 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:37,675 INFO L380 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:37,885 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:37,886 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:37,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:37,886 INFO L82 PathProgramCache]: Analyzing trace with hash 1100207717, now seen corresponding path program 13 times [2019-10-14 21:44:37,887 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:37,887 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [783266840] [2019-10-14 21:44:37,887 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:37,887 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:37,888 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:37,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:38,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:38,052 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2019-10-14 21:44:38,053 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [783266840] [2019-10-14 21:44:38,053 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [440537471] [2019-10-14 21:44:38,053 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:38,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:38,102 INFO L256 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-14 21:44:38,104 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:38,121 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2019-10-14 21:44:38,121 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:38,122 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-10-14 21:44:38,122 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682110887] [2019-10-14 21:44:38,122 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-14 21:44:38,122 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:38,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-14 21:44:38,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:44:38,123 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 18 states. [2019-10-14 21:44:38,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:38,259 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2019-10-14 21:44:38,260 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-14 21:44:38,260 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 41 [2019-10-14 21:44:38,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:38,261 INFO L225 Difference]: With dead ends: 74 [2019-10-14 21:44:38,261 INFO L226 Difference]: Without dead ends: 48 [2019-10-14 21:44:38,262 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:44:38,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-10-14 21:44:38,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2019-10-14 21:44:38,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-10-14 21:44:38,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2019-10-14 21:44:38,267 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 41 [2019-10-14 21:44:38,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:38,268 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2019-10-14 21:44:38,268 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-14 21:44:38,268 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2019-10-14 21:44:38,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2019-10-14 21:44:38,269 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:38,269 INFO L380 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:38,479 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:38,479 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:38,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:38,480 INFO L82 PathProgramCache]: Analyzing trace with hash 397624678, now seen corresponding path program 14 times [2019-10-14 21:44:38,481 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:38,481 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [589091933] [2019-10-14 21:44:38,481 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:38,482 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:38,482 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:38,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:38,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:38,700 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2019-10-14 21:44:38,701 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [589091933] [2019-10-14 21:44:38,701 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1554346728] [2019-10-14 21:44:38,701 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:38,766 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:44:38,766 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:38,768 INFO L256 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-14 21:44:38,775 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:38,798 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2019-10-14 21:44:38,802 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:38,802 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-10-14 21:44:38,802 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644155828] [2019-10-14 21:44:38,803 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-14 21:44:38,805 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:38,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-14 21:44:38,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:44:38,806 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 19 states. [2019-10-14 21:44:38,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:38,940 INFO L93 Difference]: Finished difference Result 77 states and 82 transitions. [2019-10-14 21:44:38,940 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-14 21:44:38,940 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 43 [2019-10-14 21:44:38,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:38,941 INFO L225 Difference]: With dead ends: 77 [2019-10-14 21:44:38,942 INFO L226 Difference]: Without dead ends: 50 [2019-10-14 21:44:38,942 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:44:38,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-10-14 21:44:38,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2019-10-14 21:44:38,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2019-10-14 21:44:38,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2019-10-14 21:44:38,957 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 43 [2019-10-14 21:44:38,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:38,957 INFO L462 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2019-10-14 21:44:38,958 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-14 21:44:38,958 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2019-10-14 21:44:38,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-10-14 21:44:38,960 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:38,960 INFO L380 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:39,161 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:39,161 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:39,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:39,162 INFO L82 PathProgramCache]: Analyzing trace with hash -400171259, now seen corresponding path program 15 times [2019-10-14 21:44:39,162 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:39,162 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [457764281] [2019-10-14 21:44:39,163 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:39,163 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:39,163 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:39,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:39,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:39,390 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2019-10-14 21:44:39,390 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [457764281] [2019-10-14 21:44:39,391 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [782582203] [2019-10-14 21:44:39,391 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:39,812 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-10-14 21:44:39,813 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:39,815 INFO L256 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 20 conjunts are in the unsatisfiable core [2019-10-14 21:44:39,817 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:39,832 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2019-10-14 21:44:39,833 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:39,833 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2019-10-14 21:44:39,833 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218089973] [2019-10-14 21:44:39,834 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-14 21:44:39,834 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:39,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-14 21:44:39,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:44:39,835 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 20 states. [2019-10-14 21:44:39,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:39,956 INFO L93 Difference]: Finished difference Result 80 states and 85 transitions. [2019-10-14 21:44:39,956 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-14 21:44:39,957 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 45 [2019-10-14 21:44:39,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:39,957 INFO L225 Difference]: With dead ends: 80 [2019-10-14 21:44:39,958 INFO L226 Difference]: Without dead ends: 52 [2019-10-14 21:44:39,958 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:44:39,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-10-14 21:44:39,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2019-10-14 21:44:39,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-10-14 21:44:39,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2019-10-14 21:44:39,964 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 45 [2019-10-14 21:44:39,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:39,964 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2019-10-14 21:44:39,964 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-14 21:44:39,964 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2019-10-14 21:44:39,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-10-14 21:44:39,965 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:39,965 INFO L380 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:40,170 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:40,172 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:40,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:40,173 INFO L82 PathProgramCache]: Analyzing trace with hash -264076858, now seen corresponding path program 16 times [2019-10-14 21:44:40,173 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:40,173 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [18564631] [2019-10-14 21:44:40,174 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:40,174 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:40,174 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:40,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:40,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:40,399 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-10-14 21:44:40,399 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [18564631] [2019-10-14 21:44:40,400 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [734272383] [2019-10-14 21:44:40,400 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:40,450 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:44:40,451 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:40,452 INFO L256 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-14 21:44:40,453 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:40,479 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-10-14 21:44:40,479 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:40,480 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2019-10-14 21:44:40,480 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1710553956] [2019-10-14 21:44:40,480 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-14 21:44:40,480 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:40,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-14 21:44:40,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-10-14 21:44:40,481 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 21 states. [2019-10-14 21:44:40,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:40,610 INFO L93 Difference]: Finished difference Result 83 states and 88 transitions. [2019-10-14 21:44:40,610 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-14 21:44:40,611 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 47 [2019-10-14 21:44:40,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:40,612 INFO L225 Difference]: With dead ends: 83 [2019-10-14 21:44:40,612 INFO L226 Difference]: Without dead ends: 54 [2019-10-14 21:44:40,613 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-10-14 21:44:40,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-10-14 21:44:40,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2019-10-14 21:44:40,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2019-10-14 21:44:40,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2019-10-14 21:44:40,618 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 47 [2019-10-14 21:44:40,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:40,619 INFO L462 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2019-10-14 21:44:40,619 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-14 21:44:40,619 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2019-10-14 21:44:40,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2019-10-14 21:44:40,619 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:40,620 INFO L380 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:40,830 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:40,830 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:40,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:40,831 INFO L82 PathProgramCache]: Analyzing trace with hash 387325861, now seen corresponding path program 17 times [2019-10-14 21:44:40,831 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:40,831 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1261154091] [2019-10-14 21:44:40,832 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:40,832 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:40,832 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:40,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:41,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:41,065 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2019-10-14 21:44:41,066 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1261154091] [2019-10-14 21:44:41,066 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [349532781] [2019-10-14 21:44:41,066 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:47,924 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2019-10-14 21:44:47,924 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:47,936 INFO L256 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 19 conjunts are in the unsatisfiable core [2019-10-14 21:44:47,937 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:47,960 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2019-10-14 21:44:47,961 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:47,961 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2019-10-14 21:44:47,961 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983332124] [2019-10-14 21:44:47,962 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-10-14 21:44:47,963 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:47,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-10-14 21:44:47,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-10-14 21:44:47,964 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 22 states. [2019-10-14 21:44:48,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:48,143 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2019-10-14 21:44:48,143 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-14 21:44:48,143 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 49 [2019-10-14 21:44:48,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:48,144 INFO L225 Difference]: With dead ends: 86 [2019-10-14 21:44:48,144 INFO L226 Difference]: Without dead ends: 56 [2019-10-14 21:44:48,145 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-10-14 21:44:48,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-10-14 21:44:48,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2019-10-14 21:44:48,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-10-14 21:44:48,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2019-10-14 21:44:48,149 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 49 [2019-10-14 21:44:48,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:48,150 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2019-10-14 21:44:48,150 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-10-14 21:44:48,150 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2019-10-14 21:44:48,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-10-14 21:44:48,151 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:48,151 INFO L380 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:48,351 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:48,351 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:48,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:48,352 INFO L82 PathProgramCache]: Analyzing trace with hash -1900411354, now seen corresponding path program 18 times [2019-10-14 21:44:48,352 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:48,352 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1539314812] [2019-10-14 21:44:48,352 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:48,352 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:48,352 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:48,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:48,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:48,623 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2019-10-14 21:44:48,623 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1539314812] [2019-10-14 21:44:48,623 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [800838858] [2019-10-14 21:44:48,623 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:52,086 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2019-10-14 21:44:52,087 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:52,093 INFO L256 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 23 conjunts are in the unsatisfiable core [2019-10-14 21:44:52,094 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:52,116 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2019-10-14 21:44:52,119 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:52,120 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2019-10-14 21:44:52,120 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523842609] [2019-10-14 21:44:52,120 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-14 21:44:52,120 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:52,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-14 21:44:52,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-10-14 21:44:52,125 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 23 states. [2019-10-14 21:44:52,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:52,220 INFO L93 Difference]: Finished difference Result 89 states and 94 transitions. [2019-10-14 21:44:52,220 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-10-14 21:44:52,221 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 51 [2019-10-14 21:44:52,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:52,222 INFO L225 Difference]: With dead ends: 89 [2019-10-14 21:44:52,222 INFO L226 Difference]: Without dead ends: 58 [2019-10-14 21:44:52,223 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-10-14 21:44:52,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-10-14 21:44:52,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2019-10-14 21:44:52,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-10-14 21:44:52,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2019-10-14 21:44:52,227 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 51 [2019-10-14 21:44:52,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:52,227 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2019-10-14 21:44:52,227 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-14 21:44:52,227 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2019-10-14 21:44:52,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2019-10-14 21:44:52,228 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:52,228 INFO L380 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:52,435 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:52,435 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:52,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:52,436 INFO L82 PathProgramCache]: Analyzing trace with hash -574187451, now seen corresponding path program 19 times [2019-10-14 21:44:52,436 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:52,436 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2063316618] [2019-10-14 21:44:52,436 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:52,437 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:52,437 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:52,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:52,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:52,679 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2019-10-14 21:44:52,680 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2063316618] [2019-10-14 21:44:52,680 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [244240644] [2019-10-14 21:44:52,680 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:52,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:52,742 INFO L256 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-14 21:44:52,744 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:52,759 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2019-10-14 21:44:52,759 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:52,759 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2019-10-14 21:44:52,759 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1850245772] [2019-10-14 21:44:52,760 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-14 21:44:52,760 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:52,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-14 21:44:52,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-10-14 21:44:52,761 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 24 states. [2019-10-14 21:44:52,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:52,935 INFO L93 Difference]: Finished difference Result 92 states and 97 transitions. [2019-10-14 21:44:52,935 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-10-14 21:44:52,936 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 53 [2019-10-14 21:44:52,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:52,936 INFO L225 Difference]: With dead ends: 92 [2019-10-14 21:44:52,936 INFO L226 Difference]: Without dead ends: 60 [2019-10-14 21:44:52,937 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-10-14 21:44:52,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-10-14 21:44:52,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2019-10-14 21:44:52,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-10-14 21:44:52,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2019-10-14 21:44:52,941 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 53 [2019-10-14 21:44:52,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:52,941 INFO L462 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2019-10-14 21:44:52,941 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-10-14 21:44:52,941 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2019-10-14 21:44:52,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-10-14 21:44:52,942 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:52,942 INFO L380 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:53,149 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:53,149 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:53,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:53,150 INFO L82 PathProgramCache]: Analyzing trace with hash -2076716410, now seen corresponding path program 20 times [2019-10-14 21:44:53,150 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:53,150 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1137583950] [2019-10-14 21:44:53,151 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:53,151 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:53,151 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:53,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:53,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:53,434 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2019-10-14 21:44:53,435 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1137583950] [2019-10-14 21:44:53,435 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1373527059] [2019-10-14 21:44:53,435 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:53,510 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:44:53,510 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:53,512 INFO L256 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 22 conjunts are in the unsatisfiable core [2019-10-14 21:44:53,513 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:53,535 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2019-10-14 21:44:53,535 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:53,535 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2019-10-14 21:44:53,536 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1128764745] [2019-10-14 21:44:53,536 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-10-14 21:44:53,536 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:53,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-10-14 21:44:53,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-10-14 21:44:53,537 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 25 states. [2019-10-14 21:44:53,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:53,660 INFO L93 Difference]: Finished difference Result 95 states and 100 transitions. [2019-10-14 21:44:53,660 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-10-14 21:44:53,660 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 55 [2019-10-14 21:44:53,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:53,661 INFO L225 Difference]: With dead ends: 95 [2019-10-14 21:44:53,661 INFO L226 Difference]: Without dead ends: 62 [2019-10-14 21:44:53,662 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-10-14 21:44:53,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-10-14 21:44:53,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2019-10-14 21:44:53,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2019-10-14 21:44:53,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2019-10-14 21:44:53,666 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 55 [2019-10-14 21:44:53,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:53,667 INFO L462 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2019-10-14 21:44:53,667 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-10-14 21:44:53,667 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2019-10-14 21:44:53,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-10-14 21:44:53,667 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:53,668 INFO L380 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:53,875 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:53,876 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:53,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:53,876 INFO L82 PathProgramCache]: Analyzing trace with hash 1931036901, now seen corresponding path program 21 times [2019-10-14 21:44:53,877 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:53,877 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1931759996] [2019-10-14 21:44:53,877 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:53,877 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:53,878 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:53,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:54,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:54,183 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2019-10-14 21:44:54,183 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1931759996] [2019-10-14 21:44:54,184 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [642758675] [2019-10-14 21:44:54,184 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:58,574 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2019-10-14 21:44:58,574 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:58,580 INFO L256 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 34 conjunts are in the unsatisfiable core [2019-10-14 21:44:58,582 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:58,604 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2019-10-14 21:44:58,604 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:58,604 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2019-10-14 21:44:58,605 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619144349] [2019-10-14 21:44:58,607 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-10-14 21:44:58,607 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:58,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-10-14 21:44:58,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2019-10-14 21:44:58,621 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 26 states. [2019-10-14 21:44:58,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:58,732 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2019-10-14 21:44:58,732 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-10-14 21:44:58,733 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 57 [2019-10-14 21:44:58,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:58,734 INFO L225 Difference]: With dead ends: 98 [2019-10-14 21:44:58,734 INFO L226 Difference]: Without dead ends: 64 [2019-10-14 21:44:58,735 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2019-10-14 21:44:58,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-10-14 21:44:58,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2019-10-14 21:44:58,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-10-14 21:44:58,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2019-10-14 21:44:58,740 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 57 [2019-10-14 21:44:58,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:58,740 INFO L462 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2019-10-14 21:44:58,740 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-10-14 21:44:58,741 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2019-10-14 21:44:58,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2019-10-14 21:44:58,741 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:58,741 INFO L380 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:58,949 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:58,949 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:58,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:58,950 INFO L82 PathProgramCache]: Analyzing trace with hash 173663974, now seen corresponding path program 22 times [2019-10-14 21:44:58,950 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:58,950 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1402361228] [2019-10-14 21:44:58,951 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:58,951 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:58,951 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:58,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:59,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:59,393 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2019-10-14 21:44:59,394 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1402361228] [2019-10-14 21:44:59,394 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1376122752] [2019-10-14 21:44:59,394 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:59,470 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:44:59,471 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:59,472 INFO L256 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 24 conjunts are in the unsatisfiable core [2019-10-14 21:44:59,474 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:59,490 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2019-10-14 21:44:59,490 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:59,491 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2019-10-14 21:44:59,491 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506709569] [2019-10-14 21:44:59,491 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-10-14 21:44:59,491 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:59,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-10-14 21:44:59,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-10-14 21:44:59,492 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 27 states. [2019-10-14 21:44:59,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:59,673 INFO L93 Difference]: Finished difference Result 101 states and 106 transitions. [2019-10-14 21:44:59,674 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-10-14 21:44:59,674 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 59 [2019-10-14 21:44:59,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:59,675 INFO L225 Difference]: With dead ends: 101 [2019-10-14 21:44:59,675 INFO L226 Difference]: Without dead ends: 66 [2019-10-14 21:44:59,675 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-10-14 21:44:59,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-10-14 21:44:59,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2019-10-14 21:44:59,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2019-10-14 21:44:59,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2019-10-14 21:44:59,678 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 59 [2019-10-14 21:44:59,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:59,678 INFO L462 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2019-10-14 21:44:59,678 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-10-14 21:44:59,679 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2019-10-14 21:44:59,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2019-10-14 21:44:59,679 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:59,679 INFO L380 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:59,883 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:59,883 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:59,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:59,884 INFO L82 PathProgramCache]: Analyzing trace with hash 1433416069, now seen corresponding path program 23 times [2019-10-14 21:44:59,884 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:59,884 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1352791315] [2019-10-14 21:44:59,884 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:59,885 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:59,885 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:59,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:00,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:00,270 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2019-10-14 21:45:00,270 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1352791315] [2019-10-14 21:45:00,271 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [675271603] [2019-10-14 21:45:00,271 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true