/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 BIGGEST_EQUIVALENCE_CLASS --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/sum_10x0-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 22:31:19,479 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-21 22:31:19,517 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 22:31:19,519 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 22:31:19,521 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 22:31:19,523 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 22:31:19,524 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 22:31:19,527 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 22:31:19,530 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 22:31:19,533 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 22:31:19,537 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 22:31:19,539 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 22:31:19,541 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 22:31:19,543 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 22:31:19,547 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 22:31:19,567 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 [2020-07-21 22:31:19,589 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 22:31:19,589 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 22:31:19,592 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 22:31:19,593 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 22:31:19,593 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 22:31:19,593 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 22:31:19,593 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 22:31:19,593 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 22:31:19,594 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 22:31:19,594 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 22:31:19,594 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 22:31:19,594 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 22:31:19,595 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 22:31:19,595 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 22:31:19,595 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 22:31:19,595 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 22:31:19,595 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 22:31:19,596 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 22:31:19,596 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 22:31:19,596 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 22:31:19,596 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 22:31:19,597 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:31:19,597 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 22:31:19,598 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 22:31:19,598 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 22:31:19,598 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 22:31:19,598 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:31:19,599 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 22:31:19,599 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 22:31:19,599 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 -> BIGGEST_EQUIVALENCE_CLASS 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 [2020-07-21 22:31:20,020 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 22:31:20,040 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 22:31:20,046 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 22:31:20,049 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 22:31:20,050 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 22:31:20,051 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_10x0-2.c [2020-07-21 22:31:20,166 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/638eef939/570e79ebb9214b91bdeb1e604801677b/FLAG31de44256 [2020-07-21 22:31:20,938 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 22:31:20,939 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/sum_10x0-2.c [2020-07-21 22:31:20,951 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/638eef939/570e79ebb9214b91bdeb1e604801677b/FLAG31de44256 [2020-07-21 22:31:21,249 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/638eef939/570e79ebb9214b91bdeb1e604801677b [2020-07-21 22:31:21,274 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 22:31:21,279 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 22:31:21,283 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 22:31:21,283 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 22:31:21,292 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 22:31:21,295 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:31:21" (1/1) ... [2020-07-21 22:31:21,301 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@20a42054 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:31:21, skipping insertion in model container [2020-07-21 22:31:21,302 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:31:21" (1/1) ... [2020-07-21 22:31:21,317 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 22:31:21,358 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 22:31:21,778 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:31:21,794 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 22:31:21,828 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:31:21,857 INFO L208 MainTranslator]: Completed translation [2020-07-21 22:31:21,858 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:31:21 WrapperNode [2020-07-21 22:31:21,858 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 22:31:21,861 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 22:31:21,861 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 22:31:21,861 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 22:31:21,884 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:31:21" (1/1) ... [2020-07-21 22:31:21,888 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:31:21" (1/1) ... [2020-07-21 22:31:21,903 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:31:21" (1/1) ... [2020-07-21 22:31:21,904 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:31:21" (1/1) ... [2020-07-21 22:31:21,913 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:31:21" (1/1) ... [2020-07-21 22:31:21,917 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:31:21" (1/1) ... [2020-07-21 22:31:21,928 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:31:21" (1/1) ... [2020-07-21 22:31:21,931 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 22:31:21,932 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 22:31:21,932 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 22:31:21,932 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 22:31:21,934 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:31:21" (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 [2020-07-21 22:31:22,198 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 22:31:22,199 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 22:31:22,199 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-07-21 22:31:22,199 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 22:31:22,200 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 22:31:22,201 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-07-21 22:31:22,202 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 22:31:22,202 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 22:31:22,202 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 22:31:22,470 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 22:31:22,470 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 22:31:22,477 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:31:22 BoogieIcfgContainer [2020-07-21 22:31:22,477 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 22:31:22,480 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 22:31:22,480 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 22:31:22,486 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 22:31:22,486 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:31:21" (1/3) ... [2020-07-21 22:31:22,488 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35842807 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:31:22, skipping insertion in model container [2020-07-21 22:31:22,489 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:31:21" (2/3) ... [2020-07-21 22:31:22,489 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35842807 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:31:22, skipping insertion in model container [2020-07-21 22:31:22,490 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:31:22" (3/3) ... [2020-07-21 22:31:22,493 INFO L109 eAbstractionObserver]: Analyzing ICFG sum_10x0-2.c [2020-07-21 22:31:22,509 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 22:31:22,516 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 22:31:22,531 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 22:31:22,567 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 22:31:22,567 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 22:31:22,567 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 22:31:22,567 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 22:31:22,568 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 22:31:22,568 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 22:31:22,568 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 22:31:22,568 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 22:31:22,594 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 22:31:22,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 22:31:22,604 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:31:22,606 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:31:22,607 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:31:22,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:31:22,615 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2020-07-21 22:31:22,626 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:31:22,627 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1946615801] [2020-07-21 22:31:22,627 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 [2020-07-21 22:31:22,714 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:31:22,715 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:31:22,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 27 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:31:22,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:31:22,883 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:31:22,884 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:31:22,886 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1946615801] [2020-07-21 22:31:22,888 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:31:22,889 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:31:22,891 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2005901384] [2020-07-21 22:31:22,902 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:31:22,903 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:31:22,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:31:22,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:31:22,934 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-21 22:31:23,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:31:23,158 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-07-21 22:31:23,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:31:23,162 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 22:31:23,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:31:23,177 INFO L225 Difference]: With dead ends: 30 [2020-07-21 22:31:23,178 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 22:31:23,183 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 22:31:23,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 22:31:23,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 22:31:23,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 22:31:23,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-21 22:31:23,266 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-21 22:31:23,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:31:23,267 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-21 22:31:23,268 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:31:23,269 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-21 22:31:23,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 22:31:23,273 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:31:23,274 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:31:23,475 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:31:23,477 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:31:23,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:31:23,478 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2020-07-21 22:31:23,478 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:31:23,479 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [106032240] [2020-07-21 22:31:23,479 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 [2020-07-21 22:31:23,534 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:31:23,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:31:23,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 22:31:23,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:31:23,632 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 22:31:23,633 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:31:23,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:23,983 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 22:31:23,984 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [106032240] [2020-07-21 22:31:23,985 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:31:23,985 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 22:31:23,986 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [605801886] [2020-07-21 22:31:23,989 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 22:31:23,989 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:31:23,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 22:31:23,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 22:31:23,991 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 9 states. [2020-07-21 22:31:24,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:31:24,187 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-07-21 22:31:24,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 22:31:24,190 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-07-21 22:31:24,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:31:24,194 INFO L225 Difference]: With dead ends: 25 [2020-07-21 22:31:24,194 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 22:31:24,199 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 26 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:31:24,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 22:31:24,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 22:31:24,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 22:31:24,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-21 22:31:24,224 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-07-21 22:31:24,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:31:24,228 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-21 22:31:24,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 22:31:24,229 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-21 22:31:24,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 22:31:24,233 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:31:24,234 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:31:24,449 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:31:24,450 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:31:24,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:31:24,451 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2020-07-21 22:31:24,454 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:31:24,454 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1542448680] [2020-07-21 22:31:24,455 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 [2020-07-21 22:31:24,518 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:31:24,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:31:24,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:31:24,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:31:24,590 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-07-21 22:31:24,591 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:31:24,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:24,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:25,062 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:25,064 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:25,128 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 22:31:25,129 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1542448680] [2020-07-21 22:31:25,130 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:31:25,130 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 22:31:25,130 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520929158] [2020-07-21 22:31:25,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 22:31:25,132 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:31:25,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 22:31:25,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:31:25,134 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 11 states. [2020-07-21 22:31:25,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:31:25,312 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-07-21 22:31:25,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 22:31:25,314 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 25 [2020-07-21 22:31:25,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:31:25,318 INFO L225 Difference]: With dead ends: 28 [2020-07-21 22:31:25,318 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 22:31:25,320 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 34 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:31:25,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 22:31:25,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-21 22:31:25,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-21 22:31:25,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-21 22:31:25,344 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-07-21 22:31:25,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:31:25,346 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-21 22:31:25,347 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 22:31:25,347 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-21 22:31:25,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 22:31:25,350 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:31:25,350 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:31:25,563 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:31:25,564 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:31:25,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:31:25,565 INFO L82 PathProgramCache]: Analyzing trace with hash 601942852, now seen corresponding path program 3 times [2020-07-21 22:31:25,565 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:31:25,567 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [941926958] [2020-07-21 22:31:25,569 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 [2020-07-21 22:31:25,654 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:31:25,655 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:31:25,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:31:25,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:31:25,731 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-21 22:31:25,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:31:26,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:26,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:26,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:26,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:26,473 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:26,534 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 22:31:26,534 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [941926958] [2020-07-21 22:31:26,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:31:26,535 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 22:31:26,535 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058278531] [2020-07-21 22:31:26,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:31:26,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:31:26,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:31:26,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:31:26,538 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 13 states. [2020-07-21 22:31:26,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:31:26,667 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-07-21 22:31:26,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:31:26,669 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2020-07-21 22:31:26,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:31:26,671 INFO L225 Difference]: With dead ends: 31 [2020-07-21 22:31:26,671 INFO L226 Difference]: Without dead ends: 27 [2020-07-21 22:31:26,672 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 42 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:31:26,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-21 22:31:26,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-21 22:31:26,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-21 22:31:26,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-07-21 22:31:26,681 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-07-21 22:31:26,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:31:26,682 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-07-21 22:31:26,682 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:31:26,682 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-07-21 22:31:26,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-21 22:31:26,684 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:31:26,684 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:31:26,894 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:31:26,895 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:31:26,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:31:26,896 INFO L82 PathProgramCache]: Analyzing trace with hash -183109604, now seen corresponding path program 4 times [2020-07-21 22:31:26,897 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:31:26,897 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [382994023] [2020-07-21 22:31:26,897 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 [2020-07-21 22:31:26,948 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:31:26,949 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:31:26,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:31:26,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:31:27,051 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-21 22:31:27,051 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:31:27,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:28,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:28,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:28,172 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:28,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:28,309 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-07-21 22:31:28,310 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [382994023] [2020-07-21 22:31:28,311 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:31:28,311 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 22:31:28,311 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481199327] [2020-07-21 22:31:28,312 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 22:31:28,312 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:31:28,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 22:31:28,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:31:28,314 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 15 states. [2020-07-21 22:31:28,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:31:28,480 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-07-21 22:31:28,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:31:28,487 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-07-21 22:31:28,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:31:28,488 INFO L225 Difference]: With dead ends: 34 [2020-07-21 22:31:28,489 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 22:31:28,490 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 50 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 22:31:28,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 22:31:28,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 22:31:28,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 22:31:28,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-07-21 22:31:28,499 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-07-21 22:31:28,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:31:28,500 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-07-21 22:31:28,500 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 22:31:28,500 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-07-21 22:31:28,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-21 22:31:28,502 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:31:28,502 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:31:28,707 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:31:28,708 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:31:28,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:31:28,709 INFO L82 PathProgramCache]: Analyzing trace with hash -155447420, now seen corresponding path program 5 times [2020-07-21 22:31:28,709 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:31:28,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [177396173] [2020-07-21 22:31:28,710 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 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 [2020-07-21 22:31:28,773 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:31:28,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:31:28,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 22:31:28,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:31:28,925 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 22:31:28,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:31:29,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:29,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:30,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:30,442 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:30,609 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:30,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:30,676 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:30,725 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-21 22:31:30,727 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [177396173] [2020-07-21 22:31:30,727 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:31:30,727 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 22:31:30,727 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026589435] [2020-07-21 22:31:30,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 22:31:30,728 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:31:30,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 22:31:30,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:31:30,730 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 17 states. [2020-07-21 22:31:30,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:31:30,958 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2020-07-21 22:31:30,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:31:30,963 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 43 [2020-07-21 22:31:30,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:31:30,968 INFO L225 Difference]: With dead ends: 37 [2020-07-21 22:31:30,969 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 22:31:30,972 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 58 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 22:31:30,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 22:31:30,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-21 22:31:30,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 22:31:30,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-07-21 22:31:30,994 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2020-07-21 22:31:30,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:31:30,995 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-07-21 22:31:30,996 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 22:31:31,000 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-07-21 22:31:31,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-21 22:31:31,004 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:31:31,004 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:31:31,207 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:31:31,209 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:31:31,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:31:31,210 INFO L82 PathProgramCache]: Analyzing trace with hash 1716183644, now seen corresponding path program 6 times [2020-07-21 22:31:31,210 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:31:31,211 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [877339481] [2020-07-21 22:31:31,211 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 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:31:31,313 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:31:31,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:31:31,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 22:31:31,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:31:31,472 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-07-21 22:31:31,473 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:31:32,903 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:32,905 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:33,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:33,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:33,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:33,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:33,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:33,963 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 22:31:33,964 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [877339481] [2020-07-21 22:31:33,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:31:33,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 22:31:33,965 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629437039] [2020-07-21 22:31:33,966 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 22:31:33,966 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:31:33,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 22:31:33,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 22:31:33,967 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 19 states. [2020-07-21 22:31:34,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:31:34,207 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-07-21 22:31:34,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 22:31:34,208 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 49 [2020-07-21 22:31:34,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:31:34,210 INFO L225 Difference]: With dead ends: 40 [2020-07-21 22:31:34,210 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 22:31:34,212 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 66 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 22:31:34,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 22:31:34,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-21 22:31:34,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 22:31:34,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-21 22:31:34,220 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2020-07-21 22:31:34,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:31:34,221 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-21 22:31:34,221 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 22:31:34,221 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-21 22:31:34,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-21 22:31:34,223 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:31:34,223 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:31:34,429 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:31:34,430 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:31:34,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:31:34,431 INFO L82 PathProgramCache]: Analyzing trace with hash -1079602236, now seen corresponding path program 7 times [2020-07-21 22:31:34,431 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:31:34,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [53717713] [2020-07-21 22:31:34,433 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 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:31:34,524 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:31:34,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:31:34,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 22:31:34,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:31:34,656 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-21 22:31:34,657 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:31:36,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:37,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:37,629 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:37,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:38,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:38,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:38,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:38,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:38,218 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:38,278 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-21 22:31:38,279 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [53717713] [2020-07-21 22:31:38,279 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:31:38,279 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 22:31:38,280 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260076826] [2020-07-21 22:31:38,281 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 22:31:38,281 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:31:38,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 22:31:38,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 22:31:38,283 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 21 states. [2020-07-21 22:31:38,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:31:38,618 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-07-21 22:31:38,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 22:31:38,625 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 55 [2020-07-21 22:31:38,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:31:38,628 INFO L225 Difference]: With dead ends: 43 [2020-07-21 22:31:38,628 INFO L226 Difference]: Without dead ends: 39 [2020-07-21 22:31:38,630 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 74 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 22:31:38,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-21 22:31:38,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-21 22:31:38,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-21 22:31:38,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-07-21 22:31:38,638 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2020-07-21 22:31:38,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:31:38,638 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-07-21 22:31:38,638 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 22:31:38,639 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-07-21 22:31:38,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-21 22:31:38,640 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:31:38,641 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:31:38,845 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:31:38,846 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:31:38,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:31:38,847 INFO L82 PathProgramCache]: Analyzing trace with hash 1035381916, now seen corresponding path program 8 times [2020-07-21 22:31:38,847 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:31:38,848 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [835407634] [2020-07-21 22:31:38,848 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 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:31:38,968 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:31:38,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:31:38,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 22:31:38,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:31:39,105 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-21 22:31:39,106 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:31:41,676 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:41,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:42,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:43,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:43,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:43,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:43,627 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:43,905 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:43,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:44,079 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:44,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:44,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:44,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:44,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:44,370 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-21 22:31:44,371 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [835407634] [2020-07-21 22:31:44,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:31:44,372 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 22:31:44,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [31239113] [2020-07-21 22:31:44,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 22:31:44,374 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:31:44,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 22:31:44,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 22:31:44,375 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 23 states. [2020-07-21 22:31:44,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:31:44,685 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-07-21 22:31:44,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 22:31:44,685 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 61 [2020-07-21 22:31:44,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:31:44,688 INFO L225 Difference]: With dead ends: 46 [2020-07-21 22:31:44,688 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 22:31:44,690 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 82 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 22:31:44,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 22:31:44,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-07-21 22:31:44,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-21 22:31:44,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-07-21 22:31:44,699 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2020-07-21 22:31:44,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:31:44,700 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-07-21 22:31:44,700 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 22:31:44,700 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-07-21 22:31:44,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 22:31:44,702 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:31:44,702 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:31:44,906 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:31:44,907 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:31:44,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:31:44,908 INFO L82 PathProgramCache]: Analyzing trace with hash 952137732, now seen corresponding path program 9 times [2020-07-21 22:31:44,908 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:31:44,909 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1570338155] [2020-07-21 22:31:44,909 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 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:31:45,091 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:31:45,091 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:31:45,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 22:31:45,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:31:45,248 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-07-21 22:31:45,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:31:48,383 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:48,384 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:49,503 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:50,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:51,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:51,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:51,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:51,759 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:51,944 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:52,053 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:52,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:52,123 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:52,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:31:52,212 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-07-21 22:31:52,213 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1570338155] [2020-07-21 22:31:52,214 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:31:52,214 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 24 [2020-07-21 22:31:52,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845780316] [2020-07-21 22:31:52,215 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 22:31:52,216 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:31:52,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 22:31:52,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2020-07-21 22:31:52,217 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 24 states. [2020-07-21 22:31:52,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:31:52,514 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-07-21 22:31:52,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 22:31:52,515 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 67 [2020-07-21 22:31:52,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:31:52,517 INFO L225 Difference]: With dead ends: 49 [2020-07-21 22:31:52,518 INFO L226 Difference]: Without dead ends: 45 [2020-07-21 22:31:52,520 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 90 SyntacticMatches, 21 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=385, Invalid=737, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 22:31:52,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-21 22:31:52,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-07-21 22:31:52,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 22:31:52,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-07-21 22:31:52,528 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2020-07-21 22:31:52,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:31:52,529 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-07-21 22:31:52,529 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 22:31:52,529 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-07-21 22:31:52,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-07-21 22:31:52,532 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:31:52,532 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:31:52,742 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:31:52,742 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:31:52,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:31:52,743 INFO L82 PathProgramCache]: Analyzing trace with hash 1540970204, now seen corresponding path program 10 times [2020-07-21 22:31:52,744 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:31:52,744 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1703870194] [2020-07-21 22:31:52,744 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 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:31:52,969 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:31:52,970 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 22:31:52,970 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 22:31:52,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 22:31:52,993 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 22:31:53,035 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 22:31:53,036 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 22:31:53,251 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:31:53,310 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 10:31:53 BoogieIcfgContainer [2020-07-21 22:31:53,311 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 22:31:53,315 INFO L168 Benchmark]: Toolchain (without parser) took 32037.36 ms. Allocated memory was 134.2 MB in the beginning and 437.8 MB in the end (delta: 303.6 MB). Free memory was 98.1 MB in the beginning and 289.2 MB in the end (delta: -191.1 MB). Peak memory consumption was 112.5 MB. Max. memory is 7.1 GB. [2020-07-21 22:31:53,316 INFO L168 Benchmark]: CDTParser took 0.35 ms. Allocated memory is still 134.2 MB. Free memory was 116.0 MB in the beginning and 115.8 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 22:31:53,316 INFO L168 Benchmark]: CACSL2BoogieTranslator took 576.97 ms. Allocated memory is still 134.2 MB. Free memory was 97.9 MB in the beginning and 88.6 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-21 22:31:53,317 INFO L168 Benchmark]: Boogie Preprocessor took 70.24 ms. Allocated memory is still 134.2 MB. Free memory was 88.6 MB in the beginning and 87.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-21 22:31:53,318 INFO L168 Benchmark]: RCFGBuilder took 546.10 ms. Allocated memory was 134.2 MB in the beginning and 200.3 MB in the end (delta: 66.1 MB). Free memory was 87.2 MB in the beginning and 168.7 MB in the end (delta: -81.5 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. [2020-07-21 22:31:53,319 INFO L168 Benchmark]: TraceAbstraction took 30830.96 ms. Allocated memory was 200.3 MB in the beginning and 437.8 MB in the end (delta: 237.5 MB). Free memory was 168.0 MB in the beginning and 289.2 MB in the end (delta: -121.2 MB). Peak memory consumption was 116.3 MB. Max. memory is 7.1 GB. [2020-07-21 22:31:53,324 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.35 ms. Allocated memory is still 134.2 MB. Free memory was 116.0 MB in the beginning and 115.8 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 576.97 ms. Allocated memory is still 134.2 MB. Free memory was 97.9 MB in the beginning and 88.6 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 70.24 ms. Allocated memory is still 134.2 MB. Free memory was 88.6 MB in the beginning and 87.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 546.10 ms. Allocated memory was 134.2 MB in the beginning and 200.3 MB in the end (delta: 66.1 MB). Free memory was 87.2 MB in the beginning and 168.7 MB in the end (delta: -81.5 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 30830.96 ms. Allocated memory was 200.3 MB in the beginning and 437.8 MB in the end (delta: 237.5 MB). Free memory was 168.0 MB in the beginning and 289.2 MB in the end (delta: -121.2 MB). Peak memory consumption was 116.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 16]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int a = 10; [L13] int b = 0; VAL [a=10, b=0] [L14] CALL, EXPR sum(a, b) VAL [\old(m)=0, \old(n)=10] [L4] COND FALSE !(n <= 0) VAL [\old(m)=0, \old(n)=10, m=0, n=10] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=1, \old(n)=9] [L4] COND FALSE !(n <= 0) VAL [\old(m)=1, \old(n)=9, m=1, n=9] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=2, \old(n)=8] [L4] COND FALSE !(n <= 0) VAL [\old(m)=2, \old(n)=8, m=2, n=8] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=7] [L4] COND FALSE !(n <= 0) VAL [\old(m)=3, \old(n)=7, m=3, n=7] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=6] [L4] COND FALSE !(n <= 0) VAL [\old(m)=4, \old(n)=6, m=4, n=6] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=5] [L4] COND FALSE !(n <= 0) VAL [\old(m)=5, \old(n)=5, m=5, n=5] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=6, \old(n)=4] [L4] COND FALSE !(n <= 0) VAL [\old(m)=6, \old(n)=4, m=6, n=4] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=7, \old(n)=3] [L4] COND FALSE !(n <= 0) VAL [\old(m)=7, \old(n)=3, m=7, n=3] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=8, \old(n)=2] [L4] COND FALSE !(n <= 0) VAL [\old(m)=8, \old(n)=2, m=8, n=2] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=9, \old(n)=1] [L4] COND FALSE !(n <= 0) VAL [\old(m)=9, \old(n)=1, m=9, n=1] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=10, \old(n)=0] [L4] COND TRUE n <= 0 [L5] return m + n; VAL [\old(m)=10, \old(n)=0, \result=10, m=10, n=0] [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=9, \old(n)=1, m=9, n=1, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=8, \old(n)=2, m=8, n=2, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=7, \old(n)=3, m=7, n=3, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=6, \old(n)=4, m=6, n=4, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=5, m=5, n=5, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=6, m=4, n=6, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=7, m=3, n=7, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=2, \old(n)=8, m=2, n=8, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=1, \old(n)=9, m=1, n=9, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=0, \old(n)=10, m=0, n=10, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L14] RET, EXPR sum(a, b) VAL [a=10, b=0, sum(a, b)=10] [L14] int result = sum(a, b); [L15] COND TRUE result == a + b VAL [a=10, b=0, result=10] [L16] __VERIFIER_error() VAL [a=10, b=0, result=10] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 30.6s, OverallIterations: 11, TraceHistogramMax: 11, AutomataDifference: 2.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 123 SDtfs, 510 SDslu, 699 SDs, 0 SdLazy, 472 SolverSat, 197 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 832 GetRequests, 531 SyntacticMatches, 109 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1069 ImplicationChecksByTransitivity, 3.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=45occurred in iteration=10, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 10 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 24.3s InterpolantComputationTime, 473 NumberOfCodeBlocks, 338 NumberOfCodeBlocksAsserted, 29 NumberOfCheckSat, 768 ConstructedInterpolants, 0 QuantifiedInterpolants, 106872 SizeOfPredicates, 65 NumberOfNonLiveVariables, 875 ConjunctsInSsa, 130 ConjunctsInUnsatCore, 19 InterpolantComputations, 1 PerfectInterpolantSequences, 615/1800 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 incorrect! Received shutdown request...