/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_15x0-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 01:00:21,303 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-21 01:00:21,339 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 01:00:21,341 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 01:00:21,342 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 01:00:21,344 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 01:00:21,346 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 01:00:21,348 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 01:00:21,351 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 01:00:21,354 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 01:00:21,357 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 01:00:21,359 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 01:00:21,361 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 01:00:21,363 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 01:00:21,367 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 01:00:21,380 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 01:00:21,382 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 01:00:21,383 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 01:00:21,385 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 01:00:21,408 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 01:00:21,408 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 01:00:21,414 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 01:00:21,414 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 01:00:21,415 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 01:00:21,415 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 01:00:21,415 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 01:00:21,415 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 01:00:21,416 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 01:00:21,416 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 01:00:21,416 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 01:00:21,416 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 01:00:21,417 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 01:00:21,417 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 01:00:21,417 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 01:00:21,417 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 01:00:21,418 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 01:00:21,418 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 01:00:21,418 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 01:00:21,418 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 01:00:21,419 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 01:00:21,419 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 01:00:21,419 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 01:00:21,422 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 01:00:21,422 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 01:00:21,423 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 01:00:21,423 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:21,423 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 01:00:21,423 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 01:00:21,424 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 01:00:21,822 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 01:00:21,843 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 01:00:21,848 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 01:00:21,851 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 01:00:21,852 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 01:00:21,854 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_15x0-2.c [2020-07-21 01:00:21,987 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ae0e461ca/a6b6e7d10a9e4467be178badf2fc0bb8/FLAGd6c5873fb [2020-07-21 01:00:22,815 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 01:00:22,816 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/sum_15x0-2.c [2020-07-21 01:00:22,829 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ae0e461ca/a6b6e7d10a9e4467be178badf2fc0bb8/FLAGd6c5873fb [2020-07-21 01:00:22,853 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ae0e461ca/a6b6e7d10a9e4467be178badf2fc0bb8 [2020-07-21 01:00:22,871 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 01:00:22,876 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 01:00:22,878 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 01:00:22,879 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 01:00:22,885 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 01:00:22,887 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:00:22" (1/1) ... [2020-07-21 01:00:22,892 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4fe87456 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:00:22, skipping insertion in model container [2020-07-21 01:00:22,893 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:00:22" (1/1) ... [2020-07-21 01:00:22,908 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 01:00:22,938 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 01:00:23,211 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:00:23,215 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 01:00:23,237 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:00:23,255 INFO L208 MainTranslator]: Completed translation [2020-07-21 01:00:23,256 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:00:23 WrapperNode [2020-07-21 01:00:23,256 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 01:00:23,257 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 01:00:23,258 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 01:00:23,258 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 01:00:23,273 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:00:23" (1/1) ... [2020-07-21 01:00:23,274 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:00:23" (1/1) ... [2020-07-21 01:00:23,281 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:00:23" (1/1) ... [2020-07-21 01:00:23,282 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:00:23" (1/1) ... [2020-07-21 01:00:23,288 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:00:23" (1/1) ... [2020-07-21 01:00:23,292 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:00:23" (1/1) ... [2020-07-21 01:00:23,293 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:00:23" (1/1) ... [2020-07-21 01:00:23,296 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 01:00:23,297 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 01:00:23,297 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 01:00:23,297 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 01:00:23,299 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:00:23" (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 01:00:23,506 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 01:00:23,506 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 01:00:23,507 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-07-21 01:00:23,507 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 01:00:23,507 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 01:00:23,508 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-07-21 01:00:23,508 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 01:00:23,509 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 01:00:23,509 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 01:00:23,770 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 01:00:23,771 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 01:00:23,779 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:00:23 BoogieIcfgContainer [2020-07-21 01:00:23,779 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 01:00:23,800 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 01:00:23,800 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 01:00:23,817 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 01:00:23,818 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:00:22" (1/3) ... [2020-07-21 01:00:23,822 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e10f31 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:00:23, skipping insertion in model container [2020-07-21 01:00:23,822 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:00:23" (2/3) ... [2020-07-21 01:00:23,830 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e10f31 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:00:23, skipping insertion in model container [2020-07-21 01:00:23,831 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:00:23" (3/3) ... [2020-07-21 01:00:23,839 INFO L109 eAbstractionObserver]: Analyzing ICFG sum_15x0-2.c [2020-07-21 01:00:23,875 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 01:00:23,891 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 01:00:23,922 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 01:00:23,967 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 01:00:23,968 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 01:00:23,968 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 01:00:23,968 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 01:00:23,969 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 01:00:23,969 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 01:00:23,969 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 01:00:23,969 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 01:00:24,005 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 01:00:24,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 01:00:24,018 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:00:24,020 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:00:24,021 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:00:24,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:00:24,032 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2020-07-21 01:00:24,047 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:00:24,048 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [447401171] [2020-07-21 01:00:24,049 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 01:00:24,143 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 01:00:24,144 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:00:24,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 27 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 01:00:24,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:00:24,281 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 01:00:24,281 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:00:24,283 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [447401171] [2020-07-21 01:00:24,285 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:00:24,286 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 01:00:24,287 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719341856] [2020-07-21 01:00:24,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 01:00:24,296 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:00:24,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 01:00:24,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 01:00:24,314 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-21 01:00:24,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:00:24,452 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-07-21 01:00:24,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 01:00:24,456 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 01:00:24,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:00:24,473 INFO L225 Difference]: With dead ends: 30 [2020-07-21 01:00:24,474 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 01:00:24,479 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 01:00:24,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 01:00:24,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 01:00:24,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 01:00:24,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-21 01:00:24,558 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-21 01:00:24,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:00:24,559 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-21 01:00:24,559 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 01:00:24,559 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-21 01:00:24,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 01:00:24,563 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:00:24,563 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 01:00:24,780 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:24,781 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:00:24,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:00:24,782 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2020-07-21 01:00:24,783 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:00:24,783 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1445552167] [2020-07-21 01:00:24,784 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 01:00:24,825 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:00:24,825 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:00:24,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 01:00:24,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:00:24,920 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 01:00:24,921 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:00:25,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:25,262 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 01:00:25,263 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1445552167] [2020-07-21 01:00:25,264 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:00:25,264 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 01:00:25,265 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731270564] [2020-07-21 01:00:25,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 01:00:25,268 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:00:25,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 01:00:25,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 01:00:25,270 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 9 states. [2020-07-21 01:00:25,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:00:25,411 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-07-21 01:00:25,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 01:00:25,413 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-07-21 01:00:25,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:00:25,415 INFO L225 Difference]: With dead ends: 25 [2020-07-21 01:00:25,416 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 01:00:25,419 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 01:00:25,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 01:00:25,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 01:00:25,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 01:00:25,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-21 01:00:25,429 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-07-21 01:00:25,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:00:25,430 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-21 01:00:25,430 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 01:00:25,430 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-21 01:00:25,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 01:00:25,432 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:00:25,432 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 01:00:25,646 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:25,646 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:00:25,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:00:25,647 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2020-07-21 01:00:25,648 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:00:25,649 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1510748251] [2020-07-21 01:00:25,650 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 01:00:25,695 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 01:00:25,696 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:00:25,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 01:00:25,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:00:25,776 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 01:00:25,777 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:00:26,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:26,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:26,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:26,277 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:26,328 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 01:00:26,329 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1510748251] [2020-07-21 01:00:26,329 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:00:26,330 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 01:00:26,330 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956758091] [2020-07-21 01:00:26,331 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 01:00:26,332 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:00:26,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 01:00:26,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 01:00:26,333 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 11 states. [2020-07-21 01:00:26,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:00:26,461 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-07-21 01:00:26,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 01:00:26,463 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 25 [2020-07-21 01:00:26,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:00:26,465 INFO L225 Difference]: With dead ends: 28 [2020-07-21 01:00:26,465 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 01:00:26,467 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 34 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 01:00:26,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 01:00:26,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-21 01:00:26,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-21 01:00:26,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-21 01:00:26,476 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-07-21 01:00:26,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:00:26,477 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-21 01:00:26,477 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 01:00:26,477 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-21 01:00:26,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 01:00:26,480 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:00:26,480 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 01:00:26,695 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:26,696 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:00:26,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:00:26,698 INFO L82 PathProgramCache]: Analyzing trace with hash 601942852, now seen corresponding path program 3 times [2020-07-21 01:00:26,698 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:00:26,698 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [876570401] [2020-07-21 01:00:26,699 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 01:00:26,756 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:00:26,756 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:00:26,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 01:00:26,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:00:26,840 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 01:00:26,841 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:00:27,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:27,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:27,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:27,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:27,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:27,676 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 01:00:27,677 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [876570401] [2020-07-21 01:00:27,677 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:00:27,677 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 01:00:27,678 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322705643] [2020-07-21 01:00:27,679 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 01:00:27,680 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:00:27,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 01:00:27,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 01:00:27,682 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 13 states. [2020-07-21 01:00:27,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:00:27,843 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-07-21 01:00:27,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 01:00:27,844 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2020-07-21 01:00:27,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:00:27,846 INFO L225 Difference]: With dead ends: 31 [2020-07-21 01:00:27,846 INFO L226 Difference]: Without dead ends: 27 [2020-07-21 01:00:27,847 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 01:00:27,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-21 01:00:27,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-21 01:00:27,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-21 01:00:27,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-07-21 01:00:27,856 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-07-21 01:00:27,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:00:27,856 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-07-21 01:00:27,857 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 01:00:27,857 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-07-21 01:00:27,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-21 01:00:27,859 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:00:27,859 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 01:00:28,073 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:28,075 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:00:28,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:00:28,076 INFO L82 PathProgramCache]: Analyzing trace with hash -183109604, now seen corresponding path program 4 times [2020-07-21 01:00:28,076 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:00:28,077 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [949043868] [2020-07-21 01:00:28,077 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 01:00:28,138 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 01:00:28,138 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:00:28,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 01:00:28,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:00:28,241 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 01:00:28,242 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:00:29,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:29,203 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:29,206 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:29,309 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:29,380 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:29,433 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 01:00:29,434 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [949043868] [2020-07-21 01:00:29,434 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:00:29,435 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 01:00:29,435 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898907051] [2020-07-21 01:00:29,436 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 01:00:29,437 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:00:29,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 01:00:29,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 01:00:29,438 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 15 states. [2020-07-21 01:00:29,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:00:29,630 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-07-21 01:00:29,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 01:00:29,634 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-07-21 01:00:29,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:00:29,637 INFO L225 Difference]: With dead ends: 34 [2020-07-21 01:00:29,637 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 01:00:29,638 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 01:00:29,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 01:00:29,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 01:00:29,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 01:00:29,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-07-21 01:00:29,648 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-07-21 01:00:29,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:00:29,648 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-07-21 01:00:29,649 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 01:00:29,649 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-07-21 01:00:29,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-21 01:00:29,651 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:00:29,651 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 01:00:29,852 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:29,853 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:00:29,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:00:29,853 INFO L82 PathProgramCache]: Analyzing trace with hash -155447420, now seen corresponding path program 5 times [2020-07-21 01:00:29,854 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:00:29,854 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1976036847] [2020-07-21 01:00:29,855 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 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 01:00:29,925 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:00:29,926 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:00:29,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 01:00:29,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:00:30,026 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 01:00:30,027 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:00:31,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:31,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:31,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:31,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:31,633 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:31,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:31,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:31,760 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 01:00:31,762 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1976036847] [2020-07-21 01:00:31,762 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:00:31,762 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 01:00:31,763 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701045064] [2020-07-21 01:00:31,764 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 01:00:31,764 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:00:31,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 01:00:31,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 01:00:31,766 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 17 states. [2020-07-21 01:00:31,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:00:31,995 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2020-07-21 01:00:31,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 01:00:31,997 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 43 [2020-07-21 01:00:31,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:00:31,999 INFO L225 Difference]: With dead ends: 37 [2020-07-21 01:00:31,999 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 01:00:32,000 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 58 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 01:00:32,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 01:00:32,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-21 01:00:32,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 01:00:32,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-07-21 01:00:32,008 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2020-07-21 01:00:32,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:00:32,009 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-07-21 01:00:32,009 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 01:00:32,009 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-07-21 01:00:32,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-21 01:00:32,011 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:00:32,012 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 01:00:32,220 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:32,221 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:00:32,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:00:32,222 INFO L82 PathProgramCache]: Analyzing trace with hash 1716183644, now seen corresponding path program 6 times [2020-07-21 01:00:32,222 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:00:32,223 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1442835388] [2020-07-21 01:00:32,224 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 01:00:32,288 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 01:00:32,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:00:32,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 01:00:32,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:00:32,447 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 01:00:32,448 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:00:33,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:33,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:34,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:34,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:34,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:34,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:34,732 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:34,803 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 01:00:34,803 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1442835388] [2020-07-21 01:00:34,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:00:34,804 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 01:00:34,805 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949277818] [2020-07-21 01:00:34,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 01:00:34,806 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:00:34,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 01:00:34,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 01:00:34,808 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 19 states. [2020-07-21 01:00:35,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:00:35,051 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-07-21 01:00:35,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 01:00:35,052 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 49 [2020-07-21 01:00:35,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:00:35,055 INFO L225 Difference]: With dead ends: 40 [2020-07-21 01:00:35,055 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 01:00:35,056 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 01:00:35,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 01:00:35,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-21 01:00:35,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 01:00:35,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-21 01:00:35,064 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2020-07-21 01:00:35,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:00:35,064 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-21 01:00:35,065 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 01:00:35,065 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-21 01:00:35,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-21 01:00:35,066 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:00:35,066 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 01:00:35,275 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:35,277 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:00:35,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:00:35,278 INFO L82 PathProgramCache]: Analyzing trace with hash -1079602236, now seen corresponding path program 7 times [2020-07-21 01:00:35,278 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:00:35,279 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1341039532] [2020-07-21 01:00:35,279 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 01:00:35,373 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:00:35,375 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:00:35,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 01:00:35,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:00:35,523 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 01:00:35,524 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:00:37,350 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:37,895 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:38,299 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:38,541 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:38,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:38,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:38,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:38,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:38,854 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:38,907 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 01:00:38,908 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1341039532] [2020-07-21 01:00:38,908 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:00:38,908 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 01:00:38,909 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321624384] [2020-07-21 01:00:38,909 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 01:00:38,910 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:00:38,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 01:00:38,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 01:00:38,911 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 21 states. [2020-07-21 01:00:39,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:00:39,173 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-07-21 01:00:39,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 01:00:39,179 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 55 [2020-07-21 01:00:39,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:00:39,183 INFO L225 Difference]: With dead ends: 43 [2020-07-21 01:00:39,184 INFO L226 Difference]: Without dead ends: 39 [2020-07-21 01:00:39,187 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 74 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 01:00:39,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-21 01:00:39,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-21 01:00:39,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-21 01:00:39,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-07-21 01:00:39,200 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2020-07-21 01:00:39,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:00:39,200 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-07-21 01:00:39,201 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 01:00:39,201 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-07-21 01:00:39,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-21 01:00:39,202 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:00:39,203 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 01:00:39,406 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:39,407 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:00:39,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:00:39,408 INFO L82 PathProgramCache]: Analyzing trace with hash 1035381916, now seen corresponding path program 8 times [2020-07-21 01:00:39,408 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:00:39,409 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [895595217] [2020-07-21 01:00:39,409 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 01:00:39,525 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 01:00:39,526 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:00:39,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 01:00:39,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:00:39,687 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 01:00:39,688 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:00:42,072 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:42,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:42,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:43,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:43,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:43,894 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:43,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:44,175 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:44,177 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:44,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:44,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:44,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:44,451 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:44,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:44,619 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 01:00:44,620 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [895595217] [2020-07-21 01:00:44,621 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:00:44,621 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 01:00:44,621 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120789935] [2020-07-21 01:00:44,623 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 01:00:44,623 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:00:44,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 01:00:44,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 01:00:44,625 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 23 states. [2020-07-21 01:00:44,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:00:44,949 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-07-21 01:00:44,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 01:00:44,949 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 61 [2020-07-21 01:00:44,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:00:44,952 INFO L225 Difference]: With dead ends: 46 [2020-07-21 01:00:44,953 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 01:00:44,955 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 01:00:44,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 01:00:44,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-07-21 01:00:44,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-21 01:00:44,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-07-21 01:00:44,964 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2020-07-21 01:00:44,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:00:44,965 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-07-21 01:00:44,965 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 01:00:44,965 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-07-21 01:00:44,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 01:00:44,967 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:00:44,968 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 01:00:45,183 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:45,185 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:00:45,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:00:45,186 INFO L82 PathProgramCache]: Analyzing trace with hash 952137732, now seen corresponding path program 9 times [2020-07-21 01:00:45,186 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:00:45,187 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1378706127] [2020-07-21 01:00:45,187 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 01:00:45,348 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:00:45,348 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:00:45,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 01:00:45,353 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:00:45,494 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 01:00:45,495 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:00:48,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:48,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:50,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:50,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:51,474 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:51,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:52,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:52,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:52,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:52,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:52,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:52,299 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:52,300 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:52,367 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 01:00:52,367 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1378706127] [2020-07-21 01:00:52,367 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:00:52,368 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 01:00:52,368 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903298886] [2020-07-21 01:00:52,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 01:00:52,369 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:00:52,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 01:00:52,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 01:00:52,370 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 25 states. [2020-07-21 01:00:52,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:00:52,617 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-07-21 01:00:52,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 01:00:52,618 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 67 [2020-07-21 01:00:52,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:00:52,620 INFO L225 Difference]: With dead ends: 49 [2020-07-21 01:00:52,620 INFO L226 Difference]: Without dead ends: 45 [2020-07-21 01:00:52,622 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 90 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 01:00:52,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-21 01:00:52,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-07-21 01:00:52,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 01:00:52,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-07-21 01:00:52,628 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2020-07-21 01:00:52,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:00:52,629 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-07-21 01:00:52,629 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 01:00:52,629 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-07-21 01:00:52,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-07-21 01:00:52,631 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:00:52,631 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 01:00:52,839 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:52,840 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:00:52,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:00:52,841 INFO L82 PathProgramCache]: Analyzing trace with hash 1540970204, now seen corresponding path program 10 times [2020-07-21 01:00:52,841 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:00:52,841 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [824801048] [2020-07-21 01:00:52,842 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 01:00:53,053 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 01:00:53,053 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:00:53,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 01:00:53,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:00:53,202 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2020-07-21 01:00:53,202 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:00:56,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:58,175 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:58,176 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:59,187 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:59,188 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:59,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:59,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:00,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:00,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:00,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:00,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:01,064 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:01,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:01,221 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:01,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:01,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:01,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:01,383 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:01,446 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 255 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-07-21 01:01:01,447 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [824801048] [2020-07-21 01:01:01,447 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:01:01,447 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 01:01:01,447 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485232337] [2020-07-21 01:01:01,448 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 01:01:01,449 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:01:01,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 01:01:01,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 01:01:01,450 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 27 states. [2020-07-21 01:01:01,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:01:01,745 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2020-07-21 01:01:01,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 01:01:01,745 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 73 [2020-07-21 01:01:01,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:01:01,747 INFO L225 Difference]: With dead ends: 52 [2020-07-21 01:01:01,748 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 01:01:01,750 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 98 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 01:01:01,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 01:01:01,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-07-21 01:01:01,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-21 01:01:01,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2020-07-21 01:01:01,771 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2020-07-21 01:01:01,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:01:01,772 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2020-07-21 01:01:01,772 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 01:01:01,772 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2020-07-21 01:01:01,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-07-21 01:01:01,777 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:01:01,777 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:01:01,978 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:01:01,978 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:01:01,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:01:01,979 INFO L82 PathProgramCache]: Analyzing trace with hash -2010530748, now seen corresponding path program 11 times [2020-07-21 01:01:01,979 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:01:01,980 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1757075833] [2020-07-21 01:01:01,980 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 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:01:02,260 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:01:02,261 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:01:02,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 01:01:02,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:01:02,464 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2020-07-21 01:01:02,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:01:06,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:08,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:09,866 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:09,867 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:10,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:10,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:11,723 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:11,724 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:12,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:12,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:12,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:12,717 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:12,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:12,960 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:13,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:13,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:13,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:13,366 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 308 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 01:01:13,366 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1757075833] [2020-07-21 01:01:13,367 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:01:13,367 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 01:01:13,367 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426860400] [2020-07-21 01:01:13,367 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 01:01:13,368 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:01:13,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 01:01:13,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 01:01:13,369 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 29 states. [2020-07-21 01:01:13,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:01:13,784 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2020-07-21 01:01:13,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 01:01:13,785 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 79 [2020-07-21 01:01:13,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:01:13,787 INFO L225 Difference]: With dead ends: 55 [2020-07-21 01:01:13,787 INFO L226 Difference]: Without dead ends: 51 [2020-07-21 01:01:13,788 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 106 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 01:01:13,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-07-21 01:01:13,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-07-21 01:01:13,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 01:01:13,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-07-21 01:01:13,804 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2020-07-21 01:01:13,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:01:13,805 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-07-21 01:01:13,805 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 01:01:13,805 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-07-21 01:01:13,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-07-21 01:01:13,808 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:01:13,809 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:01:14,016 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:01:14,017 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:01:14,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:01:14,018 INFO L82 PathProgramCache]: Analyzing trace with hash -986521316, now seen corresponding path program 12 times [2020-07-21 01:01:14,018 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:01:14,019 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2129316729] [2020-07-21 01:01:14,019 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 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:01:14,361 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 01:01:14,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:01:14,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 01:01:14,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:01:14,569 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-07-21 01:01:14,570 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:01:20,089 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:22,245 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:22,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:24,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:24,128 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:25,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:25,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:26,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:26,844 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:27,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:27,944 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:28,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:29,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:29,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:29,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:29,632 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:29,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:29,773 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 366 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 01:01:29,773 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2129316729] [2020-07-21 01:01:29,773 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:01:29,774 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 29] total 31 [2020-07-21 01:01:29,774 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1309757073] [2020-07-21 01:01:29,774 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 01:01:29,774 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:01:29,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 01:01:29,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2020-07-21 01:01:29,775 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 31 states. [2020-07-21 01:01:30,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:01:30,242 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2020-07-21 01:01:30,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 01:01:30,244 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 85 [2020-07-21 01:01:30,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:01:30,246 INFO L225 Difference]: With dead ends: 58 [2020-07-21 01:01:30,246 INFO L226 Difference]: Without dead ends: 54 [2020-07-21 01:01:30,248 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 114 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=619, Invalid=1273, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 01:01:30,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-21 01:01:30,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-07-21 01:01:30,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-21 01:01:30,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2020-07-21 01:01:30,255 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2020-07-21 01:01:30,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:01:30,255 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2020-07-21 01:01:30,255 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 01:01:30,255 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2020-07-21 01:01:30,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-07-21 01:01:30,257 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:01:30,257 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:01:30,458 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:01:30,458 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:01:30,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:01:30,459 INFO L82 PathProgramCache]: Analyzing trace with hash 1073897604, now seen corresponding path program 13 times [2020-07-21 01:01:30,460 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:01:30,460 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1240801386] [2020-07-21 01:01:30,460 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 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:01:30,955 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:01:30,955 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:01:30,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-21 01:01:30,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:01:31,221 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2020-07-21 01:01:31,222 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:01:33,851 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-21 01:01:33,955 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-21 01:01:34,085 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2020-07-21 01:01:38,697 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:38,698 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:41,884 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:41,884 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:44,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:44,491 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:46,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:48,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:49,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:50,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:51,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:52,300 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:52,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:52,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:52,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:52,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:53,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:53,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:53,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:53,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:01:53,259 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2020-07-21 01:01:53,259 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1240801386] [2020-07-21 01:01:53,260 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:01:53,260 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 31] total 33 [2020-07-21 01:01:53,260 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012333703] [2020-07-21 01:01:53,261 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 01:01:53,261 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:01:53,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 01:01:53,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=782, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 01:01:53,262 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 33 states. [2020-07-21 01:01:53,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:01:53,937 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2020-07-21 01:01:53,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 01:01:53,938 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 91 [2020-07-21 01:01:53,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:01:53,940 INFO L225 Difference]: With dead ends: 61 [2020-07-21 01:01:53,940 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 01:01:53,942 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 122 SyntacticMatches, 28 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 574 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=708, Invalid=1454, Unknown=0, NotChecked=0, Total=2162 [2020-07-21 01:01:53,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 01:01:53,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-07-21 01:01:53,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-21 01:01:53,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-07-21 01:01:53,949 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2020-07-21 01:01:53,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:01:53,950 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-07-21 01:01:53,950 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 01:01:53,950 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-07-21 01:01:53,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-07-21 01:01:53,951 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:01:53,951 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:01:54,154 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:01:54,154 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:01:54,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:01:54,156 INFO L82 PathProgramCache]: Analyzing trace with hash -1572648100, now seen corresponding path program 14 times [2020-07-21 01:01:54,156 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:01:54,156 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [735346723] [2020-07-21 01:01:54,156 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 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:01:54,766 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 01:01:54,767 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:01:54,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-21 01:01:54,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:01:55,221 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2020-07-21 01:01:55,222 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:01:57,662 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 01:01:57,768 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 01:01:57,878 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 01:01:57,988 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 01:01:58,109 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 01:01:58,227 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 01:01:58,350 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-21 01:01:58,469 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-21 01:01:58,598 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 01:01:58,728 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 01:01:58,861 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-21 01:01:58,993 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-21 01:01:59,137 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-21 01:01:59,282 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-21 01:01:59,429 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2020-07-21 01:01:59,592 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2020-07-21 01:01:59,716 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-21 01:01:59,836 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 93 [2020-07-21 01:01:59,958 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 90 [2020-07-21 01:02:00,079 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2020-07-21 01:02:00,182 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-21 01:02:03,324 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-21 01:02:03,451 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-21 01:02:03,603 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 01:02:03,732 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 01:02:03,874 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 01:02:03,987 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 01:02:04,124 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 01:02:04,289 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 01:02:04,425 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-21 01:02:04,552 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-21 01:02:04,714 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 01:02:04,842 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 01:02:04,987 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2020-07-21 01:02:05,114 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-21 01:02:05,229 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 93 [2020-07-21 01:02:05,340 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 90 [2020-07-21 01:02:05,447 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2020-07-21 01:02:05,554 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2020-07-21 01:02:06,535 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:02:08,979 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-21 01:02:09,084 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-21 01:02:09,197 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 01:02:09,315 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 01:02:09,436 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 01:02:09,553 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 01:02:09,672 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 01:02:09,801 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 01:02:09,924 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 93 [2020-07-21 01:02:10,038 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 90 [2020-07-21 01:02:10,181 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2020-07-21 01:02:10,284 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2020-07-21 01:02:10,391 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-21 01:02:11,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:02:13,111 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-21 01:02:13,510 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 01:02:13,622 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 01:02:13,737 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-21 01:02:13,851 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-21 01:02:13,977 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 01:02:14,095 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 01:02:14,212 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2020-07-21 01:02:14,321 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2020-07-21 01:02:15,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:02:17,111 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 01:02:17,220 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 01:02:17,621 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 01:02:17,730 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 01:02:17,847 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 01:02:17,961 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 01:02:18,111 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-21 01:02:19,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:02:21,309 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-21 01:02:22,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:02:22,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:02:24,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:02:24,854 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:02:26,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:02:26,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:02:28,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:02:28,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:02:29,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:02:29,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:02:30,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:02:30,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:02:30,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:02:30,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:02:31,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:02:31,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:02:31,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:02:31,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:02:31,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:02:31,899 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 497 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2020-07-21 01:02:31,900 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [735346723] [2020-07-21 01:02:31,900 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:02:31,901 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 33] total 34 [2020-07-21 01:02:31,901 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443338236] [2020-07-21 01:02:31,903 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-21 01:02:31,903 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:02:31,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-21 01:02:31,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=817, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 01:02:31,904 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 34 states. [2020-07-21 01:02:33,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:02:33,042 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2020-07-21 01:02:33,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 01:02:33,044 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 97 [2020-07-21 01:02:33,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:02:33,046 INFO L225 Difference]: With dead ends: 64 [2020-07-21 01:02:33,046 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 01:02:33,048 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 130 SyntacticMatches, 31 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 616 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=800, Invalid=1552, Unknown=0, NotChecked=0, Total=2352 [2020-07-21 01:02:33,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 01:02:33,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-07-21 01:02:33,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 01:02:33,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-07-21 01:02:33,055 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2020-07-21 01:02:33,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:02:33,056 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-07-21 01:02:33,056 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-21 01:02:33,056 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-07-21 01:02:33,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-07-21 01:02:33,057 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:02:33,058 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:02:33,271 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:02:33,272 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:02:33,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:02:33,273 INFO L82 PathProgramCache]: Analyzing trace with hash 1584030916, now seen corresponding path program 15 times [2020-07-21 01:02:33,273 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:02:33,273 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1088224748] [2020-07-21 01:02:33,273 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 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:02:34,054 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:02:34,055 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 01:02:34,056 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 01:02:34,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 01:02:34,087 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 01:02:34,172 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 01:02:34,172 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 01:02:34,388 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:02:34,461 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 01:02:34 BoogieIcfgContainer [2020-07-21 01:02:34,462 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 01:02:34,465 INFO L168 Benchmark]: Toolchain (without parser) took 131592.39 ms. Allocated memory was 136.3 MB in the beginning and 698.9 MB in the end (delta: 562.6 MB). Free memory was 99.8 MB in the beginning and 228.3 MB in the end (delta: -128.5 MB). Peak memory consumption was 434.0 MB. Max. memory is 7.1 GB. [2020-07-21 01:02:34,465 INFO L168 Benchmark]: CDTParser took 0.93 ms. Allocated memory is still 136.3 MB. Free memory was 118.1 MB in the beginning and 117.9 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 01:02:34,466 INFO L168 Benchmark]: CACSL2BoogieTranslator took 378.27 ms. Allocated memory is still 136.3 MB. Free memory was 99.4 MB in the beginning and 90.1 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-07-21 01:02:34,466 INFO L168 Benchmark]: Boogie Preprocessor took 38.80 ms. Allocated memory is still 136.3 MB. Free memory was 90.1 MB in the beginning and 88.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-21 01:02:34,466 INFO L168 Benchmark]: RCFGBuilder took 483.02 ms. Allocated memory was 136.3 MB in the beginning and 200.8 MB in the end (delta: 64.5 MB). Free memory was 88.8 MB in the beginning and 169.0 MB in the end (delta: -80.2 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. [2020-07-21 01:02:34,467 INFO L168 Benchmark]: TraceAbstraction took 130662.36 ms. Allocated memory was 200.8 MB in the beginning and 698.9 MB in the end (delta: 498.1 MB). Free memory was 169.0 MB in the beginning and 228.3 MB in the end (delta: -59.3 MB). Peak memory consumption was 438.7 MB. Max. memory is 7.1 GB. [2020-07-21 01:02:34,469 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.93 ms. Allocated memory is still 136.3 MB. Free memory was 118.1 MB in the beginning and 117.9 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 378.27 ms. Allocated memory is still 136.3 MB. Free memory was 99.4 MB in the beginning and 90.1 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 38.80 ms. Allocated memory is still 136.3 MB. Free memory was 90.1 MB in the beginning and 88.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 483.02 ms. Allocated memory was 136.3 MB in the beginning and 200.8 MB in the end (delta: 64.5 MB). Free memory was 88.8 MB in the beginning and 169.0 MB in the end (delta: -80.2 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 130662.36 ms. Allocated memory was 200.8 MB in the beginning and 698.9 MB in the end (delta: 498.1 MB). Free memory was 169.0 MB in the beginning and 228.3 MB in the end (delta: -59.3 MB). Peak memory consumption was 438.7 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 = 15; [L13] int b = 0; VAL [a=15, b=0] [L14] CALL, EXPR sum(a, b) VAL [\old(m)=0, \old(n)=15] [L4] COND FALSE !(n <= 0) VAL [\old(m)=0, \old(n)=15, m=0, n=15] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=1, \old(n)=14] [L4] COND FALSE !(n <= 0) VAL [\old(m)=1, \old(n)=14, m=1, n=14] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=2, \old(n)=13] [L4] COND FALSE !(n <= 0) VAL [\old(m)=2, \old(n)=13, m=2, n=13] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=12] [L4] COND FALSE !(n <= 0) VAL [\old(m)=3, \old(n)=12, m=3, n=12] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=11] [L4] COND FALSE !(n <= 0) VAL [\old(m)=4, \old(n)=11, m=4, n=11] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=10] [L4] COND FALSE !(n <= 0) VAL [\old(m)=5, \old(n)=10, m=5, n=10] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=6, \old(n)=9] [L4] COND FALSE !(n <= 0) VAL [\old(m)=6, \old(n)=9, m=6, n=9] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=7, \old(n)=8] [L4] COND FALSE !(n <= 0) VAL [\old(m)=7, \old(n)=8, m=7, n=8] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=8, \old(n)=7] [L4] COND FALSE !(n <= 0) VAL [\old(m)=8, \old(n)=7, m=8, n=7] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=9, \old(n)=6] [L4] COND FALSE !(n <= 0) VAL [\old(m)=9, \old(n)=6, m=9, n=6] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=10, \old(n)=5] [L4] COND FALSE !(n <= 0) VAL [\old(m)=10, \old(n)=5, m=10, n=5] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=11, \old(n)=4] [L4] COND FALSE !(n <= 0) VAL [\old(m)=11, \old(n)=4, m=11, n=4] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=12, \old(n)=3] [L4] COND FALSE !(n <= 0) VAL [\old(m)=12, \old(n)=3, m=12, n=3] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=13, \old(n)=2] [L4] COND FALSE !(n <= 0) VAL [\old(m)=13, \old(n)=2, m=13, n=2] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=14, \old(n)=1] [L4] COND FALSE !(n <= 0) VAL [\old(m)=14, \old(n)=1, m=14, n=1] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=15, \old(n)=0] [L4] COND TRUE n <= 0 [L5] return m + n; VAL [\old(m)=15, \old(n)=0, \result=15, m=15, n=0] [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=14, \old(n)=1, m=14, n=1, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=13, \old(n)=2, m=13, n=2, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=12, \old(n)=3, m=12, n=3, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=11, \old(n)=4, m=11, n=4, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=10, \old(n)=5, m=10, n=5, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=9, \old(n)=6, m=9, n=6, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=8, \old(n)=7, m=8, n=7, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=7, \old(n)=8, m=7, n=8, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=6, \old(n)=9, m=6, n=9, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=10, m=5, n=10, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=11, m=4, n=11, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=12, m=3, n=12, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=2, \old(n)=13, m=2, n=13, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=1, \old(n)=14, m=1, n=14, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=0, \old(n)=15, m=0, n=15, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L14] RET, EXPR sum(a, b) VAL [a=15, b=0, sum(a, b)=15] [L14] int result = sum(a, b); [L15] COND TRUE result == a + b VAL [a=15, b=0, result=15] [L16] __VERIFIER_error() VAL [a=15, b=0, result=15] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 130.4s, OverallIterations: 16, TraceHistogramMax: 16, AutomataDifference: 5.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 183 SDtfs, 1544 SDslu, 1404 SDs, 0 SdLazy, 924 SolverSat, 654 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1742 GetRequests, 1101 SyntacticMatches, 239 SemanticMatches, 402 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3554 ImplicationChecksByTransitivity, 10.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=60occurred in iteration=15, 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, 15 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 117.7s InterpolantComputationTime, 928 NumberOfCodeBlocks, 629 NumberOfCodeBlocksAsserted, 41 NumberOfCheckSat, 1608 ConstructedInterpolants, 0 QuantifiedInterpolants, 329352 SizeOfPredicates, 135 NumberOfNonLiveVariables, 1763 ConjunctsInSsa, 270 ConjunctsInUnsatCore, 29 InterpolantComputations, 1 PerfectInterpolantSequences, 2135/6300 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...