/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_o100.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:04:28,891 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:04:28,898 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:04:28,925 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:04:28,926 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:04:28,929 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:04:28,933 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:04:28,949 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:04:28,955 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:04:28,958 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:04:28,959 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:04:28,961 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:04:28,963 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:04:28,965 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:04:28,969 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:04:28,970 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:04:28,974 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:04:28,975 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:04:28,977 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:04:28,983 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:04:28,990 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:04:28,996 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:04:28,998 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:04:29,000 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:04:29,003 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:04:29,022 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:04:29,023 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:04:29,025 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:04:29,027 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 16:04:29,070 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:04:29,071 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:04:29,073 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:04:29,073 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:04:29,074 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:04:29,074 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:04:29,074 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:04:29,074 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:04:29,074 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:04:29,075 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:04:29,075 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:04:29,075 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:04:29,076 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:04:29,077 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:04:29,077 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:04:29,078 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:04:29,078 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:04:29,078 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:04:29,078 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:04:29,079 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:04:29,079 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:04:29,079 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:04:29,079 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:04:29,080 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:04:29,080 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:04:29,080 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:04:29,080 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:29,081 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:04:29,082 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:04:29,082 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES 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 -> 2 [2020-07-21 16:04:29,482 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:04:29,499 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:04:29,504 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:04:29,506 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:04:29,507 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:04:29,507 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o100.c [2020-07-21 16:04:29,595 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c5af13b83/9351e82f25054832a97cae4f85df793e/FLAG6c7182f8c [2020-07-21 16:04:30,127 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:04:30,128 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_o100.c [2020-07-21 16:04:30,136 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c5af13b83/9351e82f25054832a97cae4f85df793e/FLAG6c7182f8c [2020-07-21 16:04:30,477 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c5af13b83/9351e82f25054832a97cae4f85df793e [2020-07-21 16:04:30,489 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:04:30,493 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:04:30,495 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:04:30,495 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:04:30,500 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:04:30,501 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:04:30" (1/1) ... [2020-07-21 16:04:30,506 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@797d48eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:04:30, skipping insertion in model container [2020-07-21 16:04:30,506 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:04:30" (1/1) ... [2020-07-21 16:04:30,516 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:04:30,537 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:04:30,807 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:04:30,812 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:04:30,826 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:04:30,845 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:04:30,846 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:04:30 WrapperNode [2020-07-21 16:04:30,846 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:04:30,847 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:04:30,847 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:04:30,848 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:04:30,863 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:04:30" (1/1) ... [2020-07-21 16:04:30,863 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:04:30" (1/1) ... [2020-07-21 16:04:30,869 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:04:30" (1/1) ... [2020-07-21 16:04:30,869 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:04:30" (1/1) ... [2020-07-21 16:04:30,873 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:04:30" (1/1) ... [2020-07-21 16:04:30,876 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:04:30" (1/1) ... [2020-07-21 16:04:30,877 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:04:30" (1/1) ... [2020-07-21 16:04:30,878 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:04:30,879 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:04:30,879 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:04:30,879 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:04:30,881 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:04:30" (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 16:04:31,055 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:04:31,055 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:04:31,055 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 16:04:31,055 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:04:31,056 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 16:04:31,057 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:04:31,057 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 16:04:31,058 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:04:31,058 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:04:31,059 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:04:31,242 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:04:31,242 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 16:04:31,247 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:04:31 BoogieIcfgContainer [2020-07-21 16:04:31,247 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:04:31,248 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:04:31,249 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:04:31,253 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:04:31,253 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:04:30" (1/3) ... [2020-07-21 16:04:31,254 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a040062 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:04:31, skipping insertion in model container [2020-07-21 16:04:31,255 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:04:30" (2/3) ... [2020-07-21 16:04:31,255 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a040062 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:04:31, skipping insertion in model container [2020-07-21 16:04:31,255 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:04:31" (3/3) ... [2020-07-21 16:04:31,257 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o100.c [2020-07-21 16:04:31,266 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:04:31,274 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:04:31,291 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:04:31,321 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:04:31,321 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:04:31,321 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:04:31,322 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:04:31,323 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:04:31,323 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:04:31,323 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:04:31,323 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:04:31,341 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 16:04:31,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 16:04:31,349 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:04:31,350 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:04:31,351 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:04:31,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:04:31,357 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-21 16:04:31,365 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:04:31,365 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [448240594] [2020-07-21 16:04:31,366 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 16:04:31,482 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:04:31,483 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:31,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 16:04:31,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:31,582 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 16:04:31,583 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:04:31,584 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [448240594] [2020-07-21 16:04:31,585 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:04:31,585 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:04:31,586 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1701820649] [2020-07-21 16:04:31,590 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:04:31,591 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:04:31,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:04:31,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:04:31,604 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-21 16:04:31,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:04:31,666 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-07-21 16:04:31,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:04:31,668 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 16:04:31,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:04:31,678 INFO L225 Difference]: With dead ends: 32 [2020-07-21 16:04:31,679 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 16:04:31,682 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:04:31,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 16:04:31,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 16:04:31,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 16:04:31,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-21 16:04:31,727 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-21 16:04:31,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:04:31,727 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-21 16:04:31,728 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:04:31,728 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-21 16:04:31,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 16:04:31,730 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:04:31,730 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 16:04:31,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:31,945 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:04:31,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:04:31,946 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-21 16:04:31,946 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:04:31,947 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [51152213] [2020-07-21 16:04:31,947 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 16:04:31,993 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:04:31,993 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:31,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:04:31,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:32,048 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 16:04:32,049 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:04:32,245 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 16:04:32,246 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [51152213] [2020-07-21 16:04:32,246 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:04:32,247 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 16:04:32,247 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526698514] [2020-07-21 16:04:32,249 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:04:32,249 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:04:32,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:04:32,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:04:32,251 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states. [2020-07-21 16:04:32,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:04:32,306 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-07-21 16:04:32,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:04:32,307 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-07-21 16:04:32,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:04:32,308 INFO L225 Difference]: With dead ends: 30 [2020-07-21 16:04:32,309 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 16:04:32,310 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:04:32,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 16:04:32,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-21 16:04:32,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-21 16:04:32,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-21 16:04:32,318 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2020-07-21 16:04:32,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:04:32,319 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-21 16:04:32,319 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:04:32,319 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-21 16:04:32,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 16:04:32,321 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:04:32,321 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 16:04:32,536 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:32,538 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:04:32,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:04:32,539 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 2 times [2020-07-21 16:04:32,540 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:04:32,540 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1113747955] [2020-07-21 16:04:32,541 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 16:04:32,580 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:04:32,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:32,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 16:04:32,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:32,736 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 16:04:32,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:04:33,245 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 16:04:33,246 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1113747955] [2020-07-21 16:04:33,246 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:04:33,246 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-07-21 16:04:33,247 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88927432] [2020-07-21 16:04:33,251 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:04:33,252 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:04:33,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:04:33,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:04:33,256 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 20 states. [2020-07-21 16:04:35,762 WARN L193 SmtUtils]: Spent 2.08 s on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 16:04:35,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:04:35,796 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2020-07-21 16:04:35,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 16:04:35,797 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 31 [2020-07-21 16:04:35,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:04:35,799 INFO L225 Difference]: With dead ends: 42 [2020-07-21 16:04:35,799 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 16:04:35,800 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=98, Invalid=454, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:04:35,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 16:04:35,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-21 16:04:35,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 16:04:35,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-21 16:04:35,812 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 31 [2020-07-21 16:04:35,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:04:35,813 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-21 16:04:35,813 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:04:35,813 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-21 16:04:35,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-21 16:04:35,815 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:04:35,816 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 16:04:36,028 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:36,029 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:04:36,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:04:36,030 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 3 times [2020-07-21 16:04:36,031 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:04:36,031 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1011797750] [2020-07-21 16:04:36,032 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 16:04:36,082 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:04:36,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:36,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-21 16:04:36,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:36,369 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 16:04:36,370 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:04:46,413 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 70 refuted. 7 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-21 16:04:46,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1011797750] [2020-07-21 16:04:46,414 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:04:46,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 36 [2020-07-21 16:04:46,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [461319426] [2020-07-21 16:04:46,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 16:04:46,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:04:46,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 16:04:46,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1072, Unknown=4, NotChecked=0, Total=1260 [2020-07-21 16:04:46,418 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 36 states. [2020-07-21 16:04:53,378 WARN L193 SmtUtils]: Spent 6.32 s on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-21 16:04:58,593 WARN L193 SmtUtils]: Spent 4.22 s on a formula simplification. DAG size of input: 31 DAG size of output: 16 [2020-07-21 16:05:07,760 WARN L193 SmtUtils]: Spent 2.17 s on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2020-07-21 16:05:12,636 WARN L193 SmtUtils]: Spent 4.16 s on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 16:05:17,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:05:17,163 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2020-07-21 16:05:17,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-21 16:05:17,165 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 55 [2020-07-21 16:05:17,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:05:17,168 INFO L225 Difference]: With dead ends: 66 [2020-07-21 16:05:17,168 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 16:05:17,170 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 35.7s TimeCoverageRelationStatistics Valid=382, Invalid=1868, Unknown=6, NotChecked=0, Total=2256 [2020-07-21 16:05:17,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 16:05:17,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-07-21 16:05:17,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 16:05:17,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-07-21 16:05:17,184 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 55 [2020-07-21 16:05:17,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:05:17,185 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-07-21 16:05:17,185 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 16:05:17,185 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-07-21 16:05:17,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-07-21 16:05:17,189 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:05:17,189 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 16:05:17,390 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:17,391 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:05:17,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:05:17,392 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 4 times [2020-07-21 16:05:17,393 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:05:17,393 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1838740957] [2020-07-21 16:05:17,393 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 16:05:17,458 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:05:17,458 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:05:17,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-21 16:05:17,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:05:18,291 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-21 16:05:18,291 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:05:51,302 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 329 refuted. 16 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-21 16:05:51,303 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1838740957] [2020-07-21 16:05:51,304 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:05:51,304 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 68 [2020-07-21 16:05:51,304 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527741003] [2020-07-21 16:05:51,305 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-21 16:05:51,306 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:05:51,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-21 16:05:51,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=616, Invalid=3927, Unknown=13, NotChecked=0, Total=4556 [2020-07-21 16:05:51,309 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 68 states. [2020-07-21 16:05:58,429 WARN L193 SmtUtils]: Spent 2.39 s on a formula simplification. DAG size of input: 78 DAG size of output: 13 [2020-07-21 16:06:04,460 WARN L193 SmtUtils]: Spent 2.65 s on a formula simplification. DAG size of input: 76 DAG size of output: 11 [2020-07-21 16:06:08,596 WARN L193 SmtUtils]: Spent 896.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 13 [2020-07-21 16:06:14,815 WARN L193 SmtUtils]: Spent 539.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 11 [2020-07-21 16:06:18,594 WARN L193 SmtUtils]: Spent 496.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 13 [2020-07-21 16:06:25,893 WARN L193 SmtUtils]: Spent 390.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 11 [2020-07-21 16:06:29,600 WARN L193 SmtUtils]: Spent 619.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 13 [2020-07-21 16:06:37,237 WARN L193 SmtUtils]: Spent 559.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 11 [2020-07-21 16:06:42,975 WARN L193 SmtUtils]: Spent 496.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2020-07-21 16:06:48,271 WARN L193 SmtUtils]: Spent 350.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 11 [2020-07-21 16:06:54,264 WARN L193 SmtUtils]: Spent 461.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 13 [2020-07-21 16:06:58,788 WARN L193 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 11 [2020-07-21 16:07:05,287 WARN L193 SmtUtils]: Spent 313.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 13 [2020-07-21 16:07:08,407 WARN L193 SmtUtils]: Spent 310.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 11 [2020-07-21 16:07:10,640 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 13 [2020-07-21 16:07:19,243 WARN L193 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 11 [2020-07-21 16:07:21,714 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-21 16:07:27,345 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-21 16:07:32,808 WARN L193 SmtUtils]: Spent 2.23 s on a formula simplification. DAG size of input: 33 DAG size of output: 13 [2020-07-21 16:07:41,474 WARN L193 SmtUtils]: Spent 4.27 s on a formula simplification. DAG size of input: 31 DAG size of output: 16 [2020-07-21 16:07:58,559 WARN L193 SmtUtils]: Spent 2.12 s on a formula simplification. DAG size of input: 16 DAG size of output: 11 [2020-07-21 16:08:03,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:08:03,226 INFO L93 Difference]: Finished difference Result 114 states and 130 transitions. [2020-07-21 16:08:03,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2020-07-21 16:08:03,228 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 103 [2020-07-21 16:08:03,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:08:03,232 INFO L225 Difference]: With dead ends: 114 [2020-07-21 16:08:03,233 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 16:08:03,236 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 697 ImplicationChecksByTransitivity, 161.7s TimeCoverageRelationStatistics Valid=1525, Invalid=7576, Unknown=19, NotChecked=0, Total=9120 [2020-07-21 16:08:03,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 16:08:03,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2020-07-21 16:08:03,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-21 16:08:03,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 109 transitions. [2020-07-21 16:08:03,258 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 109 transitions. Word has length 103 [2020-07-21 16:08:03,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:08:03,259 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 109 transitions. [2020-07-21 16:08:03,259 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-21 16:08:03,259 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 109 transitions. [2020-07-21 16:08:03,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2020-07-21 16:08:03,264 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:08:03,265 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:08:03,476 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:08:03,477 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:08:03,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:08:03,478 INFO L82 PathProgramCache]: Analyzing trace with hash -935230737, now seen corresponding path program 5 times [2020-07-21 16:08:03,478 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:08:03,479 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [303647751] [2020-07-21 16:08:03,479 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 16:08:03,610 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:08:03,611 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:08:03,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 131 conjunts are in the unsatisfiable core [2020-07-21 16:08:03,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:08:07,892 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2020-07-21 16:08:07,892 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:10:24,765 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1421 refuted. 36 times theorem prover too weak. 1457 trivial. 0 not checked. [2020-07-21 16:10:24,766 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [303647751] [2020-07-21 16:10:24,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:10:24,767 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67] total 132 [2020-07-21 16:10:24,767 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1647029108] [2020-07-21 16:10:24,769 INFO L459 AbstractCegarLoop]: Interpolant automaton has 132 states [2020-07-21 16:10:24,770 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:10:24,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2020-07-21 16:10:24,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2248, Invalid=14997, Unknown=47, NotChecked=0, Total=17292 [2020-07-21 16:10:24,777 INFO L87 Difference]: Start difference. First operand 108 states and 109 transitions. Second operand 132 states. [2020-07-21 16:11:37,015 WARN L193 SmtUtils]: Spent 6.32 s on a formula simplification. DAG size of input: 158 DAG size of output: 13 [2020-07-21 16:12:38,132 WARN L193 SmtUtils]: Spent 3.97 s on a formula simplification. DAG size of input: 156 DAG size of output: 11 [2020-07-21 16:13:37,246 WARN L193 SmtUtils]: Spent 4.71 s on a formula simplification. DAG size of input: 153 DAG size of output: 13 [2020-07-21 16:14:29,664 WARN L193 SmtUtils]: Spent 2.99 s on a formula simplification. DAG size of input: 151 DAG size of output: 11 [2020-07-21 16:15:26,151 WARN L193 SmtUtils]: Spent 9.43 s on a formula simplification. DAG size of input: 148 DAG size of output: 13 [2020-07-21 16:16:21,442 WARN L193 SmtUtils]: Spent 7.90 s on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2020-07-21 16:17:18,608 WARN L193 SmtUtils]: Spent 3.58 s on a formula simplification. DAG size of input: 143 DAG size of output: 13 [2020-07-21 16:18:12,779 WARN L193 SmtUtils]: Spent 5.25 s on a formula simplification. DAG size of input: 141 DAG size of output: 11 [2020-07-21 16:19:03,342 WARN L193 SmtUtils]: Spent 2.76 s on a formula simplification. DAG size of input: 138 DAG size of output: 13