/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/sum04-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 11:48:17,108 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:48:17,110 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:48:17,122 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 11:48:17,122 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:48:17,123 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:48:17,124 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:48:17,126 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:48:17,128 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:48:17,129 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:48:17,130 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:48:17,131 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:48:17,131 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:48:17,132 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:48:17,133 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:48:17,134 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:48:17,135 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:48:17,136 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:48:17,137 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:48:17,139 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:48:17,140 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:48:17,141 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:48:17,143 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:48:17,143 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:48:17,146 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 11:48:17,153 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:48:17,154 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:48:17,155 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:48:17,155 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 [2020-07-20 11:48:17,170 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:48:17,170 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:48:17,171 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:48:17,171 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:48:17,171 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:48:17,172 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:48:17,172 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:48:17,172 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:48:17,172 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:48:17,172 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:48:17,173 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:48:17,173 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:48:17,173 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:48:17,173 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:48:17,173 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:48:17,174 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:48:17,174 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:48:17,174 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:48:17,174 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:48:17,174 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:48:17,175 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:48:17,175 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:48:17,175 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:48:17,175 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:48:17,175 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:48:17,176 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:48:17,176 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:17,176 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:48:17,176 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:48:17,176 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-20 11:48:17,479 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:48:17,492 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:48:17,495 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:48:17,497 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:48:17,497 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:48:17,498 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum04-2.i [2020-07-20 11:48:17,559 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a35dd4760/0dafc0c985ad4d2ea32d5168aea162e9/FLAG17cf97de9 [2020-07-20 11:48:17,958 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:48:17,958 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum04-2.i [2020-07-20 11:48:17,964 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a35dd4760/0dafc0c985ad4d2ea32d5168aea162e9/FLAG17cf97de9 [2020-07-20 11:48:18,338 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a35dd4760/0dafc0c985ad4d2ea32d5168aea162e9 [2020-07-20 11:48:18,347 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:48:18,350 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:48:18,351 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:48:18,351 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:48:18,355 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:48:18,356 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:48:18" (1/1) ... [2020-07-20 11:48:18,359 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4ae14bf5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:18, skipping insertion in model container [2020-07-20 11:48:18,359 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:48:18" (1/1) ... [2020-07-20 11:48:18,366 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:48:18,382 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:48:18,571 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:48:18,575 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:48:18,591 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:48:18,605 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:48:18,605 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:18 WrapperNode [2020-07-20 11:48:18,606 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:48:18,606 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:48:18,607 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:48:18,607 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:48:18,620 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:18" (1/1) ... [2020-07-20 11:48:18,620 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:18" (1/1) ... [2020-07-20 11:48:18,625 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:18" (1/1) ... [2020-07-20 11:48:18,625 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:18" (1/1) ... [2020-07-20 11:48:18,628 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:18" (1/1) ... [2020-07-20 11:48:18,633 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:18" (1/1) ... [2020-07-20 11:48:18,634 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:18" (1/1) ... [2020-07-20 11:48:18,719 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:48:18,719 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:48:18,720 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:48:18,720 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:48:18,721 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:18" (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 [2020-07-20 11:48:18,780 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:48:18,780 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:48:18,781 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 11:48:18,781 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:48:18,781 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:48:18,781 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 11:48:18,781 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:48:18,782 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:48:18,783 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:48:18,952 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:48:18,952 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 11:48:18,955 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:48:18 BoogieIcfgContainer [2020-07-20 11:48:18,956 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:48:18,957 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:48:18,957 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:48:18,960 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:48:18,960 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:48:18" (1/3) ... [2020-07-20 11:48:18,961 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6bd572bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:48:18, skipping insertion in model container [2020-07-20 11:48:18,961 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:18" (2/3) ... [2020-07-20 11:48:18,962 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6bd572bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:48:18, skipping insertion in model container [2020-07-20 11:48:18,962 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:48:18" (3/3) ... [2020-07-20 11:48:18,963 INFO L109 eAbstractionObserver]: Analyzing ICFG sum04-2.i [2020-07-20 11:48:18,974 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:48:18,981 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:48:18,995 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:48:19,018 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:48:19,019 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:48:19,019 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:48:19,019 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:48:19,019 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:48:19,019 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:48:19,020 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:48:19,020 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:48:19,036 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2020-07-20 11:48:19,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-20 11:48:19,042 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:48:19,043 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:48:19,043 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:48:19,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:48:19,049 INFO L82 PathProgramCache]: Analyzing trace with hash -10373566, now seen corresponding path program 1 times [2020-07-20 11:48:19,057 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:48:19,058 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [65903696] [2020-07-20 11:48:19,058 INFO L95 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 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:19,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:48:19,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 11:48:19,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:48:19,169 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:48:19,170 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:48:19,172 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [65903696] [2020-07-20 11:48:19,173 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:48:19,174 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 11:48:19,175 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098415788] [2020-07-20 11:48:19,180 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 11:48:19,181 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:48:19,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 11:48:19,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 11:48:19,200 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2020-07-20 11:48:19,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:48:19,236 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2020-07-20 11:48:19,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 11:48:19,237 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-07-20 11:48:19,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:48:19,244 INFO L225 Difference]: With dead ends: 29 [2020-07-20 11:48:19,244 INFO L226 Difference]: Without dead ends: 12 [2020-07-20 11:48:19,247 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 11:48:19,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-07-20 11:48:19,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-07-20 11:48:19,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-07-20 11:48:19,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-07-20 11:48:19,280 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-07-20 11:48:19,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:48:19,281 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-07-20 11:48:19,281 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 11:48:19,281 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-07-20 11:48:19,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-20 11:48:19,282 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:48:19,282 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:48:19,496 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:19,496 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:48:19,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:48:19,498 INFO L82 PathProgramCache]: Analyzing trace with hash -15914692, now seen corresponding path program 1 times [2020-07-20 11:48:19,499 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:48:19,500 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [475639267] [2020-07-20 11:48:19,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:19,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:48:19,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 11:48:19,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:48:19,558 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:48:19,559 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:48:19,559 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [475639267] [2020-07-20 11:48:19,560 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:48:19,560 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:48:19,560 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690609677] [2020-07-20 11:48:19,562 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:48:19,563 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:48:19,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:48:19,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:48:19,565 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 3 states. [2020-07-20 11:48:19,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:48:19,620 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-07-20 11:48:19,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:48:19,621 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-07-20 11:48:19,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:48:19,623 INFO L225 Difference]: With dead ends: 19 [2020-07-20 11:48:19,623 INFO L226 Difference]: Without dead ends: 14 [2020-07-20 11:48:19,624 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:48:19,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-20 11:48:19,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2020-07-20 11:48:19,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-07-20 11:48:19,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-07-20 11:48:19,630 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2020-07-20 11:48:19,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:48:19,630 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-07-20 11:48:19,630 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:48:19,631 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-07-20 11:48:19,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-20 11:48:19,632 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:48:19,632 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:48:19,846 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:19,848 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:48:19,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:48:19,849 INFO L82 PathProgramCache]: Analyzing trace with hash -1244203718, now seen corresponding path program 1 times [2020-07-20 11:48:19,849 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:48:19,850 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1034313350] [2020-07-20 11:48:19,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) [2020-07-20 11:48:19,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:48:19,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:48:19,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:19,910 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:48:19,911 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:48:19,963 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:48:19,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1034313350] [2020-07-20 11:48:19,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:48:19,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-20 11:48:19,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8941989] [2020-07-20 11:48:19,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 11:48:19,965 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:48:19,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 11:48:19,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 11:48:19,966 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 6 states. [2020-07-20 11:48:20,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:48:20,000 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2020-07-20 11:48:20,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 11:48:20,001 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 12 [2020-07-20 11:48:20,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:48:20,002 INFO L225 Difference]: With dead ends: 24 [2020-07-20 11:48:20,002 INFO L226 Difference]: Without dead ends: 19 [2020-07-20 11:48:20,003 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 11:48:20,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-07-20 11:48:20,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-07-20 11:48:20,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-07-20 11:48:20,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-07-20 11:48:20,008 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 12 [2020-07-20 11:48:20,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:48:20,009 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-07-20 11:48:20,009 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 11:48:20,009 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-07-20 11:48:20,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 11:48:20,010 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:48:20,010 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:48:20,222 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:20,223 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:48:20,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:48:20,225 INFO L82 PathProgramCache]: Analyzing trace with hash 263826484, now seen corresponding path program 2 times [2020-07-20 11:48:20,225 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:48:20,226 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1319205481] [2020-07-20 11:48:20,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:20,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:48:20,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:48:20,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:48:20,314 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:48:20,314 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:48:20,387 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:48:20,388 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1319205481] [2020-07-20 11:48:20,388 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:48:20,388 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 11:48:20,389 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735467838] [2020-07-20 11:48:20,389 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 11:48:20,389 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:48:20,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 11:48:20,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-07-20 11:48:20,390 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 10 states. [2020-07-20 11:48:20,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:48:20,433 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-07-20 11:48:20,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:48:20,434 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2020-07-20 11:48:20,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:48:20,435 INFO L225 Difference]: With dead ends: 32 [2020-07-20 11:48:20,435 INFO L226 Difference]: Without dead ends: 27 [2020-07-20 11:48:20,436 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-07-20 11:48:20,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-20 11:48:20,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-20 11:48:20,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-20 11:48:20,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-07-20 11:48:20,442 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 18 [2020-07-20 11:48:20,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:48:20,443 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-07-20 11:48:20,443 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 11:48:20,443 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-07-20 11:48:20,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 11:48:20,444 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:48:20,445 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:48:20,658 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:20,659 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:48:20,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:48:20,660 INFO L82 PathProgramCache]: Analyzing trace with hash 386905900, now seen corresponding path program 3 times [2020-07-20 11:48:20,660 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:48:20,660 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1888163971] [2020-07-20 11:48:20,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:20,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:48:20,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 11:48:20,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:48:20,852 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:48:20,853 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:48:20,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:48:21,135 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:48:21,136 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1888163971] [2020-07-20 11:48:21,136 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:48:21,136 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2020-07-20 11:48:21,137 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1592969851] [2020-07-20 11:48:21,138 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 11:48:21,139 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:48:21,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 11:48:21,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=411, Unknown=0, NotChecked=0, Total=462 [2020-07-20 11:48:21,140 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 22 states. [2020-07-20 11:48:21,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:48:21,309 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-07-20 11:48:21,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:48:21,312 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 26 [2020-07-20 11:48:21,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:48:21,313 INFO L225 Difference]: With dead ends: 34 [2020-07-20 11:48:21,313 INFO L226 Difference]: Without dead ends: 29 [2020-07-20 11:48:21,315 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=55, Invalid=451, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:48:21,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-20 11:48:21,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-07-20 11:48:21,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-20 11:48:21,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-07-20 11:48:21,325 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2020-07-20 11:48:21,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:48:21,326 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-07-20 11:48:21,326 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 11:48:21,326 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-07-20 11:48:21,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 11:48:21,327 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:48:21,328 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:48:21,542 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:21,543 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:48:21,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:48:21,544 INFO L82 PathProgramCache]: Analyzing trace with hash -680671446, now seen corresponding path program 4 times [2020-07-20 11:48:21,545 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:48:21,546 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [411959949] [2020-07-20 11:48:21,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:21,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:48:21,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 11:48:21,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:48:21,657 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 81 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:48:21,658 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:48:21,658 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [411959949] [2020-07-20 11:48:21,658 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:48:21,659 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2020-07-20 11:48:21,659 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069024301] [2020-07-20 11:48:21,659 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 11:48:21,660 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:48:21,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 11:48:21,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:48:21,660 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 11 states. [2020-07-20 11:48:21,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:48:21,727 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-07-20 11:48:21,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:48:21,727 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 28 [2020-07-20 11:48:21,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:48:21,728 INFO L225 Difference]: With dead ends: 29 [2020-07-20 11:48:21,728 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 11:48:21,729 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:48:21,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 11:48:21,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 11:48:21,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 11:48:21,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 11:48:21,730 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 28 [2020-07-20 11:48:21,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:48:21,730 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 11:48:21,730 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 11:48:21,730 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 11:48:21,730 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 11:48:21,931 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:21,935 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 11:48:22,224 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 52 [2020-07-20 11:48:22,227 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 11:48:22,228 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 11:48:22,228 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 11:48:22,228 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 11:48:22,228 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 11:48:22,228 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 11:48:22,228 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 11 17) the Hoare annotation is: true [2020-07-20 11:48:22,229 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 11 17) no Hoare annotation was computed. [2020-07-20 11:48:22,229 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 11 17) no Hoare annotation was computed. [2020-07-20 11:48:22,229 INFO L268 CegarLoopResult]: For program point L13-2(lines 13 15) no Hoare annotation was computed. [2020-07-20 11:48:22,229 INFO L264 CegarLoopResult]: At program point L13-3(lines 13 15) the Hoare annotation is: (or (and (<= 2 main_~i~0) (<= main_~i~0 2) (= 2 main_~sn~0)) (and (<= main_~i~0 8) (<= 8 main_~i~0) (= 14 main_~sn~0)) (and (<= main_~i~0 4) (= 6 main_~sn~0) (<= 4 main_~i~0)) (and (= 0 main_~sn~0) (<= main_~i~0 1) (<= 1 main_~i~0)) (and (<= 9 main_~i~0) (= 16 main_~sn~0)) (and (< main_~i~0 7) (= 10 main_~sn~0) (<= 6 main_~i~0)) (and (<= main_~i~0 3) (= 4 main_~sn~0) (<= 3 main_~i~0)) (and (<= 5 main_~i~0) (= 8 main_~sn~0) (<= main_~i~0 5)) (and (<= 7 main_~i~0) (= 12 main_~sn~0) (< main_~i~0 8))) [2020-07-20 11:48:22,230 INFO L264 CegarLoopResult]: At program point L13-4(lines 13 15) the Hoare annotation is: (= 16 main_~sn~0) [2020-07-20 11:48:22,230 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 3 8) the Hoare annotation is: true [2020-07-20 11:48:22,230 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 3 8) no Hoare annotation was computed. [2020-07-20 11:48:22,230 INFO L268 CegarLoopResult]: For program point L5(line 5) no Hoare annotation was computed. [2020-07-20 11:48:22,230 INFO L268 CegarLoopResult]: For program point L4(lines 4 6) no Hoare annotation was computed. [2020-07-20 11:48:22,230 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 5) no Hoare annotation was computed. [2020-07-20 11:48:22,231 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 8) no Hoare annotation was computed. [2020-07-20 11:48:22,250 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 11:48:22 BoogieIcfgContainer [2020-07-20 11:48:22,251 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 11:48:22,253 INFO L168 Benchmark]: Toolchain (without parser) took 3903.51 ms. Allocated memory was 143.7 MB in the beginning and 231.7 MB in the end (delta: 88.1 MB). Free memory was 102.0 MB in the beginning and 92.1 MB in the end (delta: 9.9 MB). Peak memory consumption was 98.0 MB. Max. memory is 7.1 GB. [2020-07-20 11:48:22,254 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 143.7 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 11:48:22,255 INFO L168 Benchmark]: CACSL2BoogieTranslator took 254.77 ms. Allocated memory is still 143.7 MB. Free memory was 101.6 MB in the beginning and 91.9 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. [2020-07-20 11:48:22,256 INFO L168 Benchmark]: Boogie Preprocessor took 112.63 ms. Allocated memory was 143.7 MB in the beginning and 200.8 MB in the end (delta: 57.1 MB). Free memory was 91.9 MB in the beginning and 180.9 MB in the end (delta: -89.0 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. [2020-07-20 11:48:22,256 INFO L168 Benchmark]: RCFGBuilder took 236.41 ms. Allocated memory is still 200.8 MB. Free memory was 180.9 MB in the beginning and 168.9 MB in the end (delta: 12.0 MB). Peak memory consumption was 12.0 MB. Max. memory is 7.1 GB. [2020-07-20 11:48:22,257 INFO L168 Benchmark]: TraceAbstraction took 3293.80 ms. Allocated memory was 200.8 MB in the beginning and 231.7 MB in the end (delta: 30.9 MB). Free memory was 168.2 MB in the beginning and 92.1 MB in the end (delta: 76.0 MB). Peak memory consumption was 107.0 MB. Max. memory is 7.1 GB. [2020-07-20 11:48:22,262 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 143.7 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 254.77 ms. Allocated memory is still 143.7 MB. Free memory was 101.6 MB in the beginning and 91.9 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 112.63 ms. Allocated memory was 143.7 MB in the beginning and 200.8 MB in the end (delta: 57.1 MB). Free memory was 91.9 MB in the beginning and 180.9 MB in the end (delta: -89.0 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 236.41 ms. Allocated memory is still 200.8 MB. Free memory was 180.9 MB in the beginning and 168.9 MB in the end (delta: 12.0 MB). Peak memory consumption was 12.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3293.80 ms. Allocated memory was 200.8 MB in the beginning and 231.7 MB in the end (delta: 30.9 MB). Free memory was 168.2 MB in the beginning and 92.1 MB in the end (delta: 76.0 MB). Peak memory consumption was 107.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 5]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 13]: Loop Invariant Derived loop invariant: (((((((((2 <= i && i <= 2) && 2 == sn) || ((i <= 8 && 8 <= i) && 14 == sn)) || ((i <= 4 && 6 == sn) && 4 <= i)) || ((0 == sn && i <= 1) && 1 <= i)) || (9 <= i && 16 == sn)) || ((i < 7 && 10 == sn) && 6 <= i)) || ((i <= 3 && 4 == sn) && 3 <= i)) || ((5 <= i && 8 == sn) && i <= 5)) || ((7 <= i && 12 == sn) && i < 8) - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 18 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 2.9s, OverallIterations: 6, TraceHistogramMax: 9, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.2s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 70 SDtfs, 14 SDslu, 285 SDs, 0 SdLazy, 254 SolverSat, 8 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 155 GetRequests, 108 SyntacticMatches, 4 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=29occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 1 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 12 PreInvPairs, 22 NumberOfFragments, 96 HoareAnnotationTreeSize, 12 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 6 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.8s InterpolantComputationTime, 104 NumberOfCodeBlocks, 104 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 151 ConstructedInterpolants, 0 QuantifiedInterpolants, 9191 SizeOfPredicates, 6 NumberOfNonLiveVariables, 254 ConjunctsInSsa, 43 ConjunctsInUnsatCore, 9 InterpolantComputations, 3 PerfectInterpolantSequences, 81/243 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...