/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 SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id2_b2_o3.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:35:18,236 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 13:35:18,239 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 13:35:18,252 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 13:35:18,253 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 13:35:18,254 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 13:35:18,255 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 13:35:18,257 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 13:35:18,259 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 13:35:18,260 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 13:35:18,261 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 13:35:18,262 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 13:35:18,262 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:35:18,263 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:35:18,264 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:35:18,265 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:35:18,266 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:35:18,267 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:35:18,269 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:35:18,272 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:35:18,273 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:35:18,274 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:35:18,275 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:35:18,276 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:35:18,279 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 13:35:18,286 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 13:35:18,287 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 13:35:18,288 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 13:35:18,289 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 13:35:18,304 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:35:18,304 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:35:18,305 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:35:18,306 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:35:18,306 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:35:18,306 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:35:18,306 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:35:18,307 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:35:18,307 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:35:18,307 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:35:18,307 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:35:18,307 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:35:18,307 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:35:18,308 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:35:18,308 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:35:18,308 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:35:18,308 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:35:18,308 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:35:18,309 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:35:18,309 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:35:18,309 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:35:18,309 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:35:18,309 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:35:18,310 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:35:18,310 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:35:18,310 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:35:18,310 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:18,310 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:35:18,311 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:35:18,311 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 -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 13:35:18,623 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:35:18,638 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:35:18,642 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:35:18,644 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:35:18,644 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:35:18,645 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_b2_o3.c [2020-07-20 13:35:18,711 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/421a0b264/715bb7e5f48a417aa3703d3e1d0a6a83/FLAG1a9b3080b [2020-07-20 13:35:19,230 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:35:19,232 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_b2_o3.c [2020-07-20 13:35:19,241 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/421a0b264/715bb7e5f48a417aa3703d3e1d0a6a83/FLAG1a9b3080b [2020-07-20 13:35:19,609 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/421a0b264/715bb7e5f48a417aa3703d3e1d0a6a83 [2020-07-20 13:35:19,622 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:35:19,626 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:35:19,632 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:35:19,632 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:35:19,636 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:35:19,638 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:35:19" (1/1) ... [2020-07-20 13:35:19,642 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@69058e67 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:19, skipping insertion in model container [2020-07-20 13:35:19,642 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:35:19" (1/1) ... [2020-07-20 13:35:19,652 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:35:19,673 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:35:19,862 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:35:19,867 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:35:19,883 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:35:19,899 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:35:19,899 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:19 WrapperNode [2020-07-20 13:35:19,899 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:35:19,900 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:35:19,900 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:35:19,901 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:35:19,912 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:19" (1/1) ... [2020-07-20 13:35:19,913 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:19" (1/1) ... [2020-07-20 13:35:19,917 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:19" (1/1) ... [2020-07-20 13:35:19,918 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:19" (1/1) ... [2020-07-20 13:35:20,020 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:19" (1/1) ... [2020-07-20 13:35:20,023 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:19" (1/1) ... [2020-07-20 13:35:20,025 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:19" (1/1) ... [2020-07-20 13:35:20,026 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:35:20,027 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:35:20,027 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:35:20,027 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:35:20,029 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:19" (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 13:35:20,102 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:35:20,103 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:35:20,103 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-20 13:35:20,103 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-07-20 13:35:20,103 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:35:20,103 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-20 13:35:20,103 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:35:20,104 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-20 13:35:20,104 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-07-20 13:35:20,104 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:35:20,104 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:35:20,104 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:35:20,305 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:35:20,306 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 13:35:20,312 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:35:20 BoogieIcfgContainer [2020-07-20 13:35:20,313 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:35:20,329 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:35:20,330 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:35:20,334 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:35:20,335 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:35:19" (1/3) ... [2020-07-20 13:35:20,336 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@667edfc2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:35:20, skipping insertion in model container [2020-07-20 13:35:20,336 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:19" (2/3) ... [2020-07-20 13:35:20,345 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@667edfc2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:35:20, skipping insertion in model container [2020-07-20 13:35:20,345 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:35:20" (3/3) ... [2020-07-20 13:35:20,352 INFO L109 eAbstractionObserver]: Analyzing ICFG id2_b2_o3.c [2020-07-20 13:35:20,379 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:35:20,405 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:35:20,432 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:35:20,456 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:35:20,457 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:35:20,457 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:35:20,457 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:35:20,457 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:35:20,457 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:35:20,457 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:35:20,457 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:35:20,476 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-20 13:35:20,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 13:35:20,482 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:20,483 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:20,483 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:20,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:20,489 INFO L82 PathProgramCache]: Analyzing trace with hash 128923731, now seen corresponding path program 1 times [2020-07-20 13:35:20,496 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:20,497 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1700025267] [2020-07-20 13:35:20,497 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 13:35:20,568 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:20,568 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:20,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 13:35:20,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:20,668 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 13:35:20,669 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:35:20,670 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1700025267] [2020-07-20 13:35:20,671 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:35:20,671 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:35:20,672 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781086371] [2020-07-20 13:35:20,677 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:35:20,678 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:20,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:35:20,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:35:20,693 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 5 states. [2020-07-20 13:35:20,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:20,762 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2020-07-20 13:35:20,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:35:20,764 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 13:35:20,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:20,777 INFO L225 Difference]: With dead ends: 40 [2020-07-20 13:35:20,777 INFO L226 Difference]: Without dead ends: 26 [2020-07-20 13:35:20,781 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:35:20,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-07-20 13:35:20,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-07-20 13:35:20,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 13:35:20,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2020-07-20 13:35:20,836 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 13 [2020-07-20 13:35:20,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:20,837 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2020-07-20 13:35:20,837 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:35:20,837 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2020-07-20 13:35:20,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 13:35:20,840 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:20,840 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:21,054 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:21,055 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:21,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:21,056 INFO L82 PathProgramCache]: Analyzing trace with hash 1945633833, now seen corresponding path program 1 times [2020-07-20 13:35:21,056 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:21,057 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [99381511] [2020-07-20 13:35:21,057 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 13:35:21,096 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:35:21,097 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:21,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 13:35:21,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:21,129 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 13:35:21,129 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:35:21,130 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [99381511] [2020-07-20 13:35:21,130 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:35:21,130 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:35:21,131 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351807478] [2020-07-20 13:35:21,133 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:35:21,133 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:21,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:35:21,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:35:21,134 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand 5 states. [2020-07-20 13:35:21,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:21,157 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2020-07-20 13:35:21,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:35:21,158 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-07-20 13:35:21,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:21,159 INFO L225 Difference]: With dead ends: 32 [2020-07-20 13:35:21,160 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 13:35:21,161 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:35:21,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 13:35:21,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 13:35:21,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 13:35:21,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2020-07-20 13:35:21,169 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 20 [2020-07-20 13:35:21,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:21,169 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2020-07-20 13:35:21,170 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:35:21,170 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2020-07-20 13:35:21,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 13:35:21,171 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:21,171 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:21,384 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:21,386 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:21,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:21,387 INFO L82 PathProgramCache]: Analyzing trace with hash 1974262984, now seen corresponding path program 1 times [2020-07-20 13:35:21,387 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:21,388 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1649625541] [2020-07-20 13:35:21,388 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:21,427 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:35:21,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:21,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 13:35:21,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:21,523 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 13:35:21,524 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:35:21,524 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1649625541] [2020-07-20 13:35:21,525 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:35:21,525 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-20 13:35:21,525 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [15530718] [2020-07-20 13:35:21,526 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 13:35:21,526 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:21,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 13:35:21,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-07-20 13:35:21,529 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand 8 states. [2020-07-20 13:35:21,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:21,626 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-07-20 13:35:21,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:35:21,627 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-07-20 13:35:21,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:21,628 INFO L225 Difference]: With dead ends: 48 [2020-07-20 13:35:21,628 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 13:35:21,630 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-07-20 13:35:21,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 13:35:21,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 13:35:21,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 13:35:21,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-07-20 13:35:21,645 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 20 [2020-07-20 13:35:21,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:21,645 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-07-20 13:35:21,646 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 13:35:21,646 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-07-20 13:35:21,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 13:35:21,650 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:21,651 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:21,853 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:21,854 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:21,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:21,854 INFO L82 PathProgramCache]: Analyzing trace with hash 1451784300, now seen corresponding path program 1 times [2020-07-20 13:35:21,855 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:21,855 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1375501518] [2020-07-20 13:35:21,855 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 13:35:21,890 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:21,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:21,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 13:35:21,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:21,936 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 13:35:21,936 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:35:21,937 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1375501518] [2020-07-20 13:35:21,937 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:35:21,937 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:35:21,938 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044970850] [2020-07-20 13:35:21,938 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:35:21,939 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:21,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:35:21,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:35:21,941 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 5 states. [2020-07-20 13:35:21,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:21,971 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2020-07-20 13:35:21,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:35:21,971 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 27 [2020-07-20 13:35:21,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:21,973 INFO L225 Difference]: With dead ends: 50 [2020-07-20 13:35:21,974 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 13:35:21,975 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:35:21,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 13:35:21,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2020-07-20 13:35:21,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-20 13:35:21,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2020-07-20 13:35:21,983 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 27 [2020-07-20 13:35:21,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:21,983 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2020-07-20 13:35:21,984 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:35:21,984 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2020-07-20 13:35:21,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 13:35:21,985 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:21,985 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:22,189 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:22,190 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:22,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:22,192 INFO L82 PathProgramCache]: Analyzing trace with hash 1255270795, now seen corresponding path program 1 times [2020-07-20 13:35:22,192 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:22,193 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [285875405] [2020-07-20 13:35:22,193 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 13:35:22,231 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:35:22,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:22,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 13:35:22,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:22,378 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 13:35:22,378 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:22,755 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 13:35:22,756 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [285875405] [2020-07-20 13:35:22,757 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:22,757 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-07-20 13:35:22,757 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011222333] [2020-07-20 13:35:22,759 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 13:35:22,759 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:22,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 13:35:22,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=333, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:35:22,761 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand 20 states. [2020-07-20 13:35:22,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:22,981 INFO L93 Difference]: Finished difference Result 56 states and 65 transitions. [2020-07-20 13:35:22,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 13:35:22,982 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-07-20 13:35:22,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:22,982 INFO L225 Difference]: With dead ends: 56 [2020-07-20 13:35:22,983 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 13:35:22,984 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:35:22,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 13:35:22,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 13:35:22,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 13:35:22,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 13:35:22,986 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 27 [2020-07-20 13:35:22,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:22,987 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 13:35:22,987 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 13:35:22,988 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 13:35:22,988 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 13:35:23,202 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:23,207 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 13:35:23,270 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 13:35:23,271 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 13:35:23,271 INFO L268 CegarLoopResult]: For program point L17(line 17) no Hoare annotation was computed. [2020-07-20 13:35:23,271 INFO L271 CegarLoopResult]: At program point L16(line 16) the Hoare annotation is: true [2020-07-20 13:35:23,271 INFO L268 CegarLoopResult]: For program point L15(line 15) no Hoare annotation was computed. [2020-07-20 13:35:23,271 INFO L268 CegarLoopResult]: For program point L16-1(line 16) no Hoare annotation was computed. [2020-07-20 13:35:23,271 INFO L268 CegarLoopResult]: For program point id2EXIT(lines 14 19) no Hoare annotation was computed. [2020-07-20 13:35:23,272 INFO L271 CegarLoopResult]: At program point id2ENTRY(lines 14 19) the Hoare annotation is: true [2020-07-20 13:35:23,272 INFO L268 CegarLoopResult]: For program point id2FINAL(lines 14 19) no Hoare annotation was computed. [2020-07-20 13:35:23,272 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 13:35:23,272 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 13:35:23,272 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 13:35:23,272 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 13:35:23,273 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 25) no Hoare annotation was computed. [2020-07-20 13:35:23,273 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 21 27) the Hoare annotation is: true [2020-07-20 13:35:23,273 INFO L268 CegarLoopResult]: For program point L25(line 25) no Hoare annotation was computed. [2020-07-20 13:35:23,273 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 21 27) no Hoare annotation was computed. [2020-07-20 13:35:23,273 INFO L268 CegarLoopResult]: For program point L24(lines 24 26) no Hoare annotation was computed. [2020-07-20 13:35:23,274 INFO L271 CegarLoopResult]: At program point L23(line 23) the Hoare annotation is: true [2020-07-20 13:35:23,274 INFO L268 CegarLoopResult]: For program point L23-1(line 23) no Hoare annotation was computed. [2020-07-20 13:35:23,274 INFO L268 CegarLoopResult]: For program point L24-2(lines 21 27) no Hoare annotation was computed. [2020-07-20 13:35:23,274 INFO L268 CegarLoopResult]: For program point idFINAL(lines 7 12) no Hoare annotation was computed. [2020-07-20 13:35:23,274 INFO L268 CegarLoopResult]: For program point idEXIT(lines 7 12) no Hoare annotation was computed. [2020-07-20 13:35:23,274 INFO L268 CegarLoopResult]: For program point L10(line 10) no Hoare annotation was computed. [2020-07-20 13:35:23,274 INFO L271 CegarLoopResult]: At program point L9(line 9) the Hoare annotation is: true [2020-07-20 13:35:23,275 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-07-20 13:35:23,275 INFO L268 CegarLoopResult]: For program point L9-1(line 9) no Hoare annotation was computed. [2020-07-20 13:35:23,275 INFO L271 CegarLoopResult]: At program point idENTRY(lines 7 12) the Hoare annotation is: true [2020-07-20 13:35:23,282 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 01:35:23 BoogieIcfgContainer [2020-07-20 13:35:23,282 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 13:35:23,285 INFO L168 Benchmark]: Toolchain (without parser) took 3659.89 ms. Allocated memory was 142.1 MB in the beginning and 226.0 MB in the end (delta: 83.9 MB). Free memory was 99.7 MB in the beginning and 125.9 MB in the end (delta: -26.2 MB). Peak memory consumption was 57.7 MB. Max. memory is 7.1 GB. [2020-07-20 13:35:23,286 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 142.1 MB. Free memory was 118.3 MB in the beginning and 118.1 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-07-20 13:35:23,287 INFO L168 Benchmark]: CACSL2BoogieTranslator took 268.00 ms. Allocated memory is still 142.1 MB. Free memory was 99.3 MB in the beginning and 89.8 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-07-20 13:35:23,288 INFO L168 Benchmark]: Boogie Preprocessor took 125.89 ms. Allocated memory was 142.1 MB in the beginning and 199.2 MB in the end (delta: 57.1 MB). Free memory was 89.8 MB in the beginning and 178.1 MB in the end (delta: -88.4 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2020-07-20 13:35:23,289 INFO L168 Benchmark]: RCFGBuilder took 286.75 ms. Allocated memory is still 199.2 MB. Free memory was 178.1 MB in the beginning and 164.3 MB in the end (delta: 13.8 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. [2020-07-20 13:35:23,290 INFO L168 Benchmark]: TraceAbstraction took 2952.71 ms. Allocated memory was 199.2 MB in the beginning and 226.0 MB in the end (delta: 26.7 MB). Free memory was 164.3 MB in the beginning and 125.9 MB in the end (delta: 38.5 MB). Peak memory consumption was 65.2 MB. Max. memory is 7.1 GB. [2020-07-20 13:35:23,295 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 142.1 MB. Free memory was 118.3 MB in the beginning and 118.1 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 268.00 ms. Allocated memory is still 142.1 MB. Free memory was 99.3 MB in the beginning and 89.8 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 125.89 ms. Allocated memory was 142.1 MB in the beginning and 199.2 MB in the end (delta: 57.1 MB). Free memory was 89.8 MB in the beginning and 178.1 MB in the end (delta: -88.4 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 286.75 ms. Allocated memory is still 199.2 MB. Free memory was 178.1 MB in the beginning and 164.3 MB in the end (delta: 13.8 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2952.71 ms. Allocated memory was 199.2 MB in the beginning and 226.0 MB in the end (delta: 26.7 MB). Free memory was 164.3 MB in the beginning and 125.9 MB in the end (delta: 38.5 MB). Peak memory consumption was 65.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 25]: 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 - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 28 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 2.7s, OverallIterations: 5, TraceHistogramMax: 2, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 140 SDtfs, 14 SDslu, 712 SDs, 0 SdLazy, 160 SolverSat, 7 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 133 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=34occurred in iteration=4, 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, 5 MinimizatonAttempts, 6 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 11 PreInvPairs, 11 NumberOfFragments, 9 HoareAnnotationTreeSize, 11 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 9 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.7s InterpolantComputationTime, 107 NumberOfCodeBlocks, 100 NumberOfCodeBlocksAsserted, 18 NumberOfCheckSat, 128 ConstructedInterpolants, 0 QuantifiedInterpolants, 5890 SizeOfPredicates, 8 NumberOfNonLiveVariables, 230 ConjunctsInSsa, 53 ConjunctsInUnsatCore, 6 InterpolantComputations, 4 PerfectInterpolantSequences, 8/12 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...