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/loop-acceleration/nested_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 23:14:11,187 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 23:14:11,189 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 23:14:11,204 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 23:14:11,205 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 23:14:11,207 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 23:14:11,210 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 23:14:11,220 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 23:14:11,222 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 23:14:11,224 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 23:14:11,225 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 23:14:11,228 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 23:14:11,228 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 23:14:11,231 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 23:14:11,234 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 23:14:11,236 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 23:14:11,237 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 23:14:11,240 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 23:14:11,242 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 23:14:11,247 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 23:14:11,252 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 23:14:11,255 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 23:14:11,258 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 23:14:11,259 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 23:14:11,262 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-14 23:14:11,266 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 23:14:11,268 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 23:14:11,269 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 23:14:11,270 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 23:14:11,271 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 23:14:11,271 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 23:14:11,272 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 23:14:11,272 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 23:14:11,272 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 23:14:11,273 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 23:14:11,274 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 23:14:11,275 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 23:14:11,302 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 23:14:11,303 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 23:14:11,305 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 23:14:11,305 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 23:14:11,305 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 23:14:11,305 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 23:14:11,306 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 23:14:11,306 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 23:14:11,306 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 23:14:11,306 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 23:14:11,307 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 23:14:11,307 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 23:14:11,307 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 23:14:11,308 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 23:14:11,308 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 23:14:11,308 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 23:14:11,308 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 23:14:11,309 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 23:14:11,309 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 23:14:11,309 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 23:14:11,309 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 23:14:11,309 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 23:14:11,310 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 23:14:11,310 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 23:14:11,310 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 23:14:11,310 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 23:14:11,310 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 23:14:11,311 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 23:14:11,311 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 23:14:11,601 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 23:14:11,615 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 23:14:11,620 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 23:14:11,622 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 23:14:11,622 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 23:14:11,623 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/nested_1-1.c [2019-10-14 23:14:11,697 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/429c7a87c/7c593116a77b4a7ca6ff7222bf935669/FLAGe001fa2e8 [2019-10-14 23:14:12,162 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 23:14:12,162 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/nested_1-1.c [2019-10-14 23:14:12,169 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/429c7a87c/7c593116a77b4a7ca6ff7222bf935669/FLAGe001fa2e8 [2019-10-14 23:14:12,578 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/429c7a87c/7c593116a77b4a7ca6ff7222bf935669 [2019-10-14 23:14:12,588 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 23:14:12,589 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 23:14:12,590 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 23:14:12,590 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 23:14:12,594 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 23:14:12,595 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 11:14:12" (1/1) ... [2019-10-14 23:14:12,597 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6aa59c7d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:12, skipping insertion in model container [2019-10-14 23:14:12,597 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 11:14:12" (1/1) ... [2019-10-14 23:14:12,604 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 23:14:12,623 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 23:14:12,807 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 23:14:12,816 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 23:14:12,829 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 23:14:12,842 INFO L192 MainTranslator]: Completed translation [2019-10-14 23:14:12,842 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:12 WrapperNode [2019-10-14 23:14:12,842 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 23:14:12,843 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 23:14:12,843 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 23:14:12,843 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 23:14:12,931 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:12" (1/1) ... [2019-10-14 23:14:12,931 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:12" (1/1) ... [2019-10-14 23:14:12,936 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:12" (1/1) ... [2019-10-14 23:14:12,937 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:12" (1/1) ... [2019-10-14 23:14:12,941 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:12" (1/1) ... [2019-10-14 23:14:12,946 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:12" (1/1) ... [2019-10-14 23:14:12,947 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:12" (1/1) ... [2019-10-14 23:14:12,948 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 23:14:12,949 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 23:14:12,949 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 23:14:12,949 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 23:14:12,951 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:12" (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 23:14:13,002 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 23:14:13,002 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 23:14:13,002 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 23:14:13,002 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 23:14:13,002 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 23:14:13,002 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 23:14:13,002 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 23:14:13,003 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 23:14:13,003 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 23:14:13,181 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 23:14:13,182 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-10-14 23:14:13,183 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 11:14:13 BoogieIcfgContainer [2019-10-14 23:14:13,183 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 23:14:13,184 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 23:14:13,184 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 23:14:13,187 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 23:14:13,187 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 11:14:12" (1/3) ... [2019-10-14 23:14:13,188 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a681a27 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 11:14:13, skipping insertion in model container [2019-10-14 23:14:13,188 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:12" (2/3) ... [2019-10-14 23:14:13,189 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a681a27 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 11:14:13, skipping insertion in model container [2019-10-14 23:14:13,189 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 11:14:13" (3/3) ... [2019-10-14 23:14:13,191 INFO L109 eAbstractionObserver]: Analyzing ICFG nested_1-1.c [2019-10-14 23:14:13,199 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 23:14:13,204 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 23:14:13,215 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 23:14:13,238 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 23:14:13,238 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 23:14:13,238 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 23:14:13,238 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 23:14:13,239 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 23:14:13,239 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 23:14:13,239 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 23:14:13,239 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 23:14:13,255 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2019-10-14 23:14:13,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-10-14 23:14:13,260 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:13,260 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:13,261 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:13,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:13,266 INFO L82 PathProgramCache]: Analyzing trace with hash -873786703, now seen corresponding path program 1 times [2019-10-14 23:14:13,272 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:13,272 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1970744160] [2019-10-14 23:14:13,272 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:13,273 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:13,273 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:13,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:13,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:13,502 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 23:14:13,503 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1970744160] [2019-10-14 23:14:13,504 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 23:14:13,504 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-14 23:14:13,505 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [21515400] [2019-10-14 23:14:13,510 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 23:14:13,510 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:13,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 23:14:13,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 23:14:13,529 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2019-10-14 23:14:13,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:13,569 INFO L93 Difference]: Finished difference Result 36 states and 49 transitions. [2019-10-14 23:14:13,570 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 23:14:13,571 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2019-10-14 23:14:13,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:13,580 INFO L225 Difference]: With dead ends: 36 [2019-10-14 23:14:13,581 INFO L226 Difference]: Without dead ends: 16 [2019-10-14 23:14:13,584 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 1 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 23:14:13,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-10-14 23:14:13,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 14. [2019-10-14 23:14:13,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-10-14 23:14:13,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2019-10-14 23:14:13,621 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2019-10-14 23:14:13,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:13,621 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2019-10-14 23:14:13,621 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 23:14:13,621 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2019-10-14 23:14:13,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-14 23:14:13,622 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:13,622 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:13,623 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:13,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:13,623 INFO L82 PathProgramCache]: Analyzing trace with hash 1621360120, now seen corresponding path program 1 times [2019-10-14 23:14:13,624 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:13,624 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [627100642] [2019-10-14 23:14:13,624 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:13,625 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:13,625 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:13,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:13,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:13,697 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:13,698 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [627100642] [2019-10-14 23:14:13,698 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 23:14:13,699 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-14 23:14:13,699 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [113442742] [2019-10-14 23:14:13,701 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 23:14:13,701 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:13,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 23:14:13,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 23:14:13,702 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 3 states. [2019-10-14 23:14:13,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:13,717 INFO L93 Difference]: Finished difference Result 23 states and 26 transitions. [2019-10-14 23:14:13,717 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 23:14:13,717 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2019-10-14 23:14:13,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:13,718 INFO L225 Difference]: With dead ends: 23 [2019-10-14 23:14:13,719 INFO L226 Difference]: Without dead ends: 15 [2019-10-14 23:14:13,720 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 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 23:14:13,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-10-14 23:14:13,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-10-14 23:14:13,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-10-14 23:14:13,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2019-10-14 23:14:13,725 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2019-10-14 23:14:13,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:13,726 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2019-10-14 23:14:13,726 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 23:14:13,726 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2019-10-14 23:14:13,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-14 23:14:13,727 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:13,727 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:13,727 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:13,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:13,728 INFO L82 PathProgramCache]: Analyzing trace with hash 1574756514, now seen corresponding path program 1 times [2019-10-14 23:14:13,728 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:13,729 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [656984981] [2019-10-14 23:14:13,729 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:13,729 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:13,729 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:13,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:13,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:13,828 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:13,831 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [656984981] [2019-10-14 23:14:13,831 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1671588825] [2019-10-14 23:14:13,831 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 23:14:13,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:13,868 INFO L256 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 23:14:13,874 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:13,922 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:13,922 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:13,923 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 7 [2019-10-14 23:14:13,923 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991315969] [2019-10-14 23:14:13,924 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-14 23:14:13,924 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:13,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-14 23:14:13,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2019-10-14 23:14:13,925 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 7 states. [2019-10-14 23:14:14,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:14,046 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2019-10-14 23:14:14,047 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-14 23:14:14,047 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2019-10-14 23:14:14,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:14,048 INFO L225 Difference]: With dead ends: 34 [2019-10-14 23:14:14,048 INFO L226 Difference]: Without dead ends: 25 [2019-10-14 23:14:14,049 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2019-10-14 23:14:14,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-10-14 23:14:14,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 21. [2019-10-14 23:14:14,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-10-14 23:14:14,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2019-10-14 23:14:14,056 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 14 [2019-10-14 23:14:14,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:14,057 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2019-10-14 23:14:14,057 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-14 23:14:14,057 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2019-10-14 23:14:14,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-14 23:14:14,058 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:14,058 INFO L380 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:14,262 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:14,266 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:14,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:14,266 INFO L82 PathProgramCache]: Analyzing trace with hash 93409041, now seen corresponding path program 2 times [2019-10-14 23:14:14,267 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:14,267 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1605151319] [2019-10-14 23:14:14,267 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:14,267 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:14,267 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:14,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:14,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:14,386 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-10-14 23:14:14,386 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1605151319] [2019-10-14 23:14:14,386 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [557975981] [2019-10-14 23:14:14,387 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 23:14:14,427 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:14:14,428 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:14,429 INFO L256 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 23:14:14,431 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:14,464 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-14 23:14:14,465 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:14,465 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2019-10-14 23:14:14,466 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [68344091] [2019-10-14 23:14:14,466 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-14 23:14:14,466 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:14,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-14 23:14:14,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2019-10-14 23:14:14,467 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 8 states. [2019-10-14 23:14:14,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:14,736 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2019-10-14 23:14:14,736 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-14 23:14:14,736 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2019-10-14 23:14:14,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:14,737 INFO L225 Difference]: With dead ends: 46 [2019-10-14 23:14:14,738 INFO L226 Difference]: Without dead ends: 34 [2019-10-14 23:14:14,738 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2019-10-14 23:14:14,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-10-14 23:14:14,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 29. [2019-10-14 23:14:14,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-10-14 23:14:14,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2019-10-14 23:14:14,747 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 20 [2019-10-14 23:14:14,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:14,747 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2019-10-14 23:14:14,747 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-14 23:14:14,747 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2019-10-14 23:14:14,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-14 23:14:14,748 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:14,749 INFO L380 BasicCegarLoop]: trace histogram [9, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:14,952 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:14,953 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:14,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:14,954 INFO L82 PathProgramCache]: Analyzing trace with hash 50981508, now seen corresponding path program 3 times [2019-10-14 23:14:14,954 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:14,954 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [795202927] [2019-10-14 23:14:14,955 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:14,955 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:14,955 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:14,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:15,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:15,088 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 35 proven. 6 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2019-10-14 23:14:15,089 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [795202927] [2019-10-14 23:14:15,090 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1226991304] [2019-10-14 23:14:15,090 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 23:14:15,151 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-10-14 23:14:15,152 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:15,152 INFO L256 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 23:14:15,157 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:15,198 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 37 proven. 6 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2019-10-14 23:14:15,198 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:15,198 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2019-10-14 23:14:15,199 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522140574] [2019-10-14 23:14:15,200 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-14 23:14:15,200 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:15,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-14 23:14:15,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2019-10-14 23:14:15,201 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 7 states. [2019-10-14 23:14:15,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:15,244 INFO L93 Difference]: Finished difference Result 51 states and 59 transitions. [2019-10-14 23:14:15,245 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 23:14:15,245 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 28 [2019-10-14 23:14:15,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:15,246 INFO L225 Difference]: With dead ends: 51 [2019-10-14 23:14:15,246 INFO L226 Difference]: Without dead ends: 32 [2019-10-14 23:14:15,247 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2019-10-14 23:14:15,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-10-14 23:14:15,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2019-10-14 23:14:15,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-10-14 23:14:15,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2019-10-14 23:14:15,254 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 28 [2019-10-14 23:14:15,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:15,254 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2019-10-14 23:14:15,254 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-14 23:14:15,254 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2019-10-14 23:14:15,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-10-14 23:14:15,255 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:15,256 INFO L380 BasicCegarLoop]: trace histogram [12, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:15,467 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:15,468 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:15,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:15,468 INFO L82 PathProgramCache]: Analyzing trace with hash 1418818136, now seen corresponding path program 4 times [2019-10-14 23:14:15,468 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:15,469 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1406246380] [2019-10-14 23:14:15,469 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:15,470 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:15,470 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:15,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:15,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:15,609 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 53 proven. 10 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2019-10-14 23:14:15,610 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1406246380] [2019-10-14 23:14:15,610 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1370074441] [2019-10-14 23:14:15,610 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 23:14:15,658 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 23:14:15,658 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:15,660 INFO L256 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-14 23:14:15,663 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:15,780 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 94 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2019-10-14 23:14:15,780 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:15,780 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 10] total 15 [2019-10-14 23:14:15,781 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834649727] [2019-10-14 23:14:15,782 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-14 23:14:15,782 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:15,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-14 23:14:15,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2019-10-14 23:14:15,783 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 15 states. [2019-10-14 23:14:16,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:16,232 INFO L93 Difference]: Finished difference Result 71 states and 84 transitions. [2019-10-14 23:14:16,233 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-10-14 23:14:16,234 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 31 [2019-10-14 23:14:16,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:16,235 INFO L225 Difference]: With dead ends: 71 [2019-10-14 23:14:16,235 INFO L226 Difference]: Without dead ends: 50 [2019-10-14 23:14:16,236 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=135, Invalid=795, Unknown=0, NotChecked=0, Total=930 [2019-10-14 23:14:16,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-10-14 23:14:16,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 43. [2019-10-14 23:14:16,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-10-14 23:14:16,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2019-10-14 23:14:16,248 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 31 [2019-10-14 23:14:16,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:16,249 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2019-10-14 23:14:16,249 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-14 23:14:16,249 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2019-10-14 23:14:16,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-10-14 23:14:16,253 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:16,253 INFO L380 BasicCegarLoop]: trace histogram [20, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:16,453 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:16,454 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:16,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:16,455 INFO L82 PathProgramCache]: Analyzing trace with hash -1949427083, now seen corresponding path program 5 times [2019-10-14 23:14:16,455 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:16,456 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [20449275] [2019-10-14 23:14:16,456 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:16,456 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:16,457 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:16,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:16,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:16,624 INFO L134 CoverageAnalysis]: Checked inductivity of 292 backedges. 112 proven. 15 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2019-10-14 23:14:16,625 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [20449275] [2019-10-14 23:14:16,625 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1814193651] [2019-10-14 23:14:16,626 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 23:14:16,689 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2019-10-14 23:14:16,690 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:16,691 INFO L256 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-14 23:14:16,694 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:16,729 INFO L134 CoverageAnalysis]: Checked inductivity of 292 backedges. 189 proven. 15 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2019-10-14 23:14:16,729 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:16,729 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2019-10-14 23:14:16,730 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514739113] [2019-10-14 23:14:16,731 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 23:14:16,731 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:16,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 23:14:16,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2019-10-14 23:14:16,732 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 9 states. [2019-10-14 23:14:16,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:16,785 INFO L93 Difference]: Finished difference Result 78 states and 89 transitions. [2019-10-14 23:14:16,786 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-14 23:14:16,786 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 42 [2019-10-14 23:14:16,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:16,787 INFO L225 Difference]: With dead ends: 78 [2019-10-14 23:14:16,787 INFO L226 Difference]: Without dead ends: 47 [2019-10-14 23:14:16,788 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2019-10-14 23:14:16,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-10-14 23:14:16,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2019-10-14 23:14:16,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-10-14 23:14:16,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2019-10-14 23:14:16,808 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 42 [2019-10-14 23:14:16,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:16,809 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2019-10-14 23:14:16,809 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 23:14:16,809 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2019-10-14 23:14:16,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-10-14 23:14:16,811 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:16,812 INFO L380 BasicCegarLoop]: trace histogram [24, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:17,024 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:17,025 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:17,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:17,025 INFO L82 PathProgramCache]: Analyzing trace with hash -649475471, now seen corresponding path program 6 times [2019-10-14 23:14:17,025 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:17,025 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1386253383] [2019-10-14 23:14:17,025 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:17,026 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:17,026 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:17,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:17,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:17,169 INFO L134 CoverageAnalysis]: Checked inductivity of 394 backedges. 151 proven. 21 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2019-10-14 23:14:17,169 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1386253383] [2019-10-14 23:14:17,170 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1591951248] [2019-10-14 23:14:17,170 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 23:14:17,280 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2019-10-14 23:14:17,280 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:17,281 INFO L256 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-14 23:14:17,283 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:17,322 INFO L134 CoverageAnalysis]: Checked inductivity of 394 backedges. 254 proven. 21 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2019-10-14 23:14:17,324 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:17,324 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2019-10-14 23:14:17,324 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536645299] [2019-10-14 23:14:17,325 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-14 23:14:17,328 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:17,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-14 23:14:17,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2019-10-14 23:14:17,329 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand 10 states. [2019-10-14 23:14:17,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:17,394 INFO L93 Difference]: Finished difference Result 85 states and 96 transitions. [2019-10-14 23:14:17,394 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-14 23:14:17,394 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 46 [2019-10-14 23:14:17,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:17,395 INFO L225 Difference]: With dead ends: 85 [2019-10-14 23:14:17,395 INFO L226 Difference]: Without dead ends: 51 [2019-10-14 23:14:17,396 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2019-10-14 23:14:17,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2019-10-14 23:14:17,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2019-10-14 23:14:17,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2019-10-14 23:14:17,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 55 transitions. [2019-10-14 23:14:17,408 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 55 transitions. Word has length 46 [2019-10-14 23:14:17,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:17,408 INFO L462 AbstractCegarLoop]: Abstraction has 51 states and 55 transitions. [2019-10-14 23:14:17,408 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-14 23:14:17,408 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 55 transitions. [2019-10-14 23:14:17,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-10-14 23:14:17,409 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:17,410 INFO L380 BasicCegarLoop]: trace histogram [28, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:17,610 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:17,611 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:17,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:17,611 INFO L82 PathProgramCache]: Analyzing trace with hash -1892649995, now seen corresponding path program 7 times [2019-10-14 23:14:17,611 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:17,612 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [851423483] [2019-10-14 23:14:17,612 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:17,612 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:17,612 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:17,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:17,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:17,804 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 196 proven. 28 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-10-14 23:14:17,805 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [851423483] [2019-10-14 23:14:17,805 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1752645152] [2019-10-14 23:14:17,805 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 23:14:17,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:17,854 INFO L256 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 22 conjunts are in the unsatisfiable core [2019-10-14 23:14:17,857 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:18,060 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 425 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2019-10-14 23:14:18,060 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:18,060 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 20 [2019-10-14 23:14:18,060 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1532572897] [2019-10-14 23:14:18,061 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-14 23:14:18,061 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:18,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-14 23:14:18,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=321, Unknown=0, NotChecked=0, Total=380 [2019-10-14 23:14:18,062 INFO L87 Difference]: Start difference. First operand 51 states and 55 transitions. Second operand 20 states. [2019-10-14 23:14:18,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:18,978 INFO L93 Difference]: Finished difference Result 113 states and 129 transitions. [2019-10-14 23:14:18,978 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2019-10-14 23:14:18,978 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 50 [2019-10-14 23:14:18,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:18,979 INFO L225 Difference]: With dead ends: 113 [2019-10-14 23:14:18,979 INFO L226 Difference]: Without dead ends: 76 [2019-10-14 23:14:18,981 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 815 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=264, Invalid=2706, Unknown=0, NotChecked=0, Total=2970 [2019-10-14 23:14:18,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-10-14 23:14:18,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 66. [2019-10-14 23:14:18,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2019-10-14 23:14:18,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 71 transitions. [2019-10-14 23:14:18,991 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 71 transitions. Word has length 50 [2019-10-14 23:14:18,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:18,991 INFO L462 AbstractCegarLoop]: Abstraction has 66 states and 71 transitions. [2019-10-14 23:14:18,991 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-14 23:14:18,991 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 71 transitions. [2019-10-14 23:14:18,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2019-10-14 23:14:18,993 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:18,993 INFO L380 BasicCegarLoop]: trace histogram [40, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:19,197 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:19,198 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:19,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:19,199 INFO L82 PathProgramCache]: Analyzing trace with hash 1564944312, now seen corresponding path program 8 times [2019-10-14 23:14:19,199 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:19,199 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1904824702] [2019-10-14 23:14:19,199 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:19,200 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:19,200 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:19,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:19,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:19,387 INFO L134 CoverageAnalysis]: Checked inductivity of 1015 backedges. 329 proven. 36 refuted. 0 times theorem prover too weak. 650 trivial. 0 not checked. [2019-10-14 23:14:19,388 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1904824702] [2019-10-14 23:14:19,388 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1531188617] [2019-10-14 23:14:19,388 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 23:14:19,441 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:14:19,442 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:19,443 INFO L256 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 26 conjunts are in the unsatisfiable core [2019-10-14 23:14:19,446 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:19,644 INFO L134 CoverageAnalysis]: Checked inductivity of 1015 backedges. 0 proven. 868 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2019-10-14 23:14:19,644 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:19,644 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 23 [2019-10-14 23:14:19,645 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938176588] [2019-10-14 23:14:19,645 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-14 23:14:19,646 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:19,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-14 23:14:19,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2019-10-14 23:14:19,647 INFO L87 Difference]: Start difference. First operand 66 states and 71 transitions. Second operand 23 states. [2019-10-14 23:14:20,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:20,984 INFO L93 Difference]: Finished difference Result 145 states and 164 transitions. [2019-10-14 23:14:20,984 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2019-10-14 23:14:20,984 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 65 [2019-10-14 23:14:20,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:20,985 INFO L225 Difference]: With dead ends: 145 [2019-10-14 23:14:20,985 INFO L226 Difference]: Without dead ends: 94 [2019-10-14 23:14:20,988 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1479 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=351, Invalid=4619, Unknown=0, NotChecked=0, Total=4970 [2019-10-14 23:14:20,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2019-10-14 23:14:20,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 83. [2019-10-14 23:14:20,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2019-10-14 23:14:21,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 89 transitions. [2019-10-14 23:14:21,001 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 89 transitions. Word has length 65 [2019-10-14 23:14:21,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:21,002 INFO L462 AbstractCegarLoop]: Abstraction has 83 states and 89 transitions. [2019-10-14 23:14:21,002 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-14 23:14:21,002 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 89 transitions. [2019-10-14 23:14:21,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2019-10-14 23:14:21,004 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:21,004 INFO L380 BasicCegarLoop]: trace histogram [54, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:21,209 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:21,210 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:21,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:21,211 INFO L82 PathProgramCache]: Analyzing trace with hash 1497018839, now seen corresponding path program 9 times [2019-10-14 23:14:21,211 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:21,212 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [302443247] [2019-10-14 23:14:21,212 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:21,212 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:21,213 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:21,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:21,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:21,396 INFO L134 CoverageAnalysis]: Checked inductivity of 1806 backedges. 506 proven. 45 refuted. 0 times theorem prover too weak. 1255 trivial. 0 not checked. [2019-10-14 23:14:21,396 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [302443247] [2019-10-14 23:14:21,397 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1219297784] [2019-10-14 23:14:21,397 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 23:14:21,557 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2019-10-14 23:14:21,557 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:21,558 INFO L256 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-14 23:14:21,561 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:21,595 INFO L134 CoverageAnalysis]: Checked inductivity of 1806 backedges. 511 proven. 45 refuted. 0 times theorem prover too weak. 1250 trivial. 0 not checked. [2019-10-14 23:14:21,596 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:21,596 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2019-10-14 23:14:21,596 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038405070] [2019-10-14 23:14:21,597 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-14 23:14:21,597 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:21,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-14 23:14:21,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2019-10-14 23:14:21,598 INFO L87 Difference]: Start difference. First operand 83 states and 89 transitions. Second operand 13 states. [2019-10-14 23:14:21,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:21,704 INFO L93 Difference]: Finished difference Result 156 states and 173 transitions. [2019-10-14 23:14:21,707 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 23:14:21,707 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 82 [2019-10-14 23:14:21,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:21,708 INFO L225 Difference]: With dead ends: 156 [2019-10-14 23:14:21,708 INFO L226 Difference]: Without dead ends: 89 [2019-10-14 23:14:21,709 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2019-10-14 23:14:21,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2019-10-14 23:14:21,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2019-10-14 23:14:21,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2019-10-14 23:14:21,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 95 transitions. [2019-10-14 23:14:21,719 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 95 transitions. Word has length 82 [2019-10-14 23:14:21,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:21,719 INFO L462 AbstractCegarLoop]: Abstraction has 89 states and 95 transitions. [2019-10-14 23:14:21,719 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-14 23:14:21,719 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 95 transitions. [2019-10-14 23:14:21,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2019-10-14 23:14:21,721 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:21,721 INFO L380 BasicCegarLoop]: trace histogram [60, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:21,925 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:21,925 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:21,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:21,926 INFO L82 PathProgramCache]: Analyzing trace with hash 642319569, now seen corresponding path program 10 times [2019-10-14 23:14:21,926 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:21,926 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1760827586] [2019-10-14 23:14:21,926 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:21,926 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:21,926 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:21,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:22,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:22,088 INFO L134 CoverageAnalysis]: Checked inductivity of 2181 backedges. 0 proven. 1851 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2019-10-14 23:14:22,088 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1760827586] [2019-10-14 23:14:22,088 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1357641850] [2019-10-14 23:14:22,089 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 23:14:22,147 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 23:14:22,147 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:22,148 INFO L256 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 30 conjunts are in the unsatisfiable core [2019-10-14 23:14:22,151 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:22,316 INFO L134 CoverageAnalysis]: Checked inductivity of 2181 backedges. 0 proven. 1900 refuted. 0 times theorem prover too weak. 281 trivial. 0 not checked. [2019-10-14 23:14:22,317 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:22,317 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 16] total 17 [2019-10-14 23:14:22,317 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038777834] [2019-10-14 23:14:22,318 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-14 23:14:22,318 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:22,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-14 23:14:22,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2019-10-14 23:14:22,319 INFO L87 Difference]: Start difference. First operand 89 states and 95 transitions. Second operand 17 states. [2019-10-14 23:14:22,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:22,659 INFO L93 Difference]: Finished difference Result 119 states and 127 transitions. [2019-10-14 23:14:22,661 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-10-14 23:14:22,661 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 88 [2019-10-14 23:14:22,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:22,663 INFO L225 Difference]: With dead ends: 119 [2019-10-14 23:14:22,663 INFO L226 Difference]: Without dead ends: 114 [2019-10-14 23:14:22,663 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 82 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2019-10-14 23:14:22,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2019-10-14 23:14:22,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 102. [2019-10-14 23:14:22,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2019-10-14 23:14:22,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 109 transitions. [2019-10-14 23:14:22,675 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 109 transitions. Word has length 88 [2019-10-14 23:14:22,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:22,676 INFO L462 AbstractCegarLoop]: Abstraction has 102 states and 109 transitions. [2019-10-14 23:14:22,676 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-14 23:14:22,676 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 109 transitions. [2019-10-14 23:14:22,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2019-10-14 23:14:22,677 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:22,677 INFO L380 BasicCegarLoop]: trace histogram [70, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:22,880 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:22,881 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:22,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:22,882 INFO L82 PathProgramCache]: Analyzing trace with hash -284489192, now seen corresponding path program 11 times [2019-10-14 23:14:22,882 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:22,882 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1024287009] [2019-10-14 23:14:22,883 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:22,883 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:22,883 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:22,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:23,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:23,087 INFO L134 CoverageAnalysis]: Checked inductivity of 2975 backedges. 0 proven. 2590 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2019-10-14 23:14:23,088 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1024287009] [2019-10-14 23:14:23,088 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [579346620] [2019-10-14 23:14:23,088 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