/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_5-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:34:59,808 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-20 13:34:59,826 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 13:34:59,827 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 13:34:59,828 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 13:34:59,830 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 13:34:59,832 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 13:34:59,833 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 13:34:59,834 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 13:34:59,835 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 13:34:59,836 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:34:59,837 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:34:59,838 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:34:59,839 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:34:59,840 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:34:59,841 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:34:59,843 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:34:59,845 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:34:59,846 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:34:59,847 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:34:59,849 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:34:59,849 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:34:59,852 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 13:34:59,860 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 13:34:59,860 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 13:34:59,861 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 13:34:59,862 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 13:34:59,877 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:34:59,878 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:34:59,879 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:34:59,879 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:34:59,880 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:34:59,880 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:34:59,880 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:34:59,880 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:34:59,880 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:34:59,881 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:34:59,881 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:34:59,881 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:34:59,881 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:34:59,881 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:34:59,881 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:34:59,882 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:34:59,882 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:34:59,882 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:34:59,882 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:34:59,883 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:34:59,883 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:34:59,883 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:34:59,883 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:34:59,883 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:34:59,884 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:34:59,884 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:34:59,884 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:59,884 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:34:59,884 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:34:59,885 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 13:35:00,226 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:35:00,240 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:35:00,245 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:35:00,247 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:35:00,247 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:35:00,248 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_5-2.c [2020-07-20 13:35:00,327 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8494fe49f/e3975aa28e16428da45b78461ea736a7/FLAG405df291f [2020-07-20 13:35:00,811 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:35:00,812 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_5-2.c [2020-07-20 13:35:00,821 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8494fe49f/e3975aa28e16428da45b78461ea736a7/FLAG405df291f [2020-07-20 13:35:01,189 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8494fe49f/e3975aa28e16428da45b78461ea736a7 [2020-07-20 13:35:01,201 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:35:01,205 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:35:01,207 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:35:01,207 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:35:01,214 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:35:01,216 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:35:01" (1/1) ... [2020-07-20 13:35:01,220 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1941cf0d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:01, skipping insertion in model container [2020-07-20 13:35:01,220 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:35:01" (1/1) ... [2020-07-20 13:35:01,229 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:35:01,256 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:35:01,499 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:35:01,503 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:35:01,517 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:35:01,530 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:35:01,531 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:01 WrapperNode [2020-07-20 13:35:01,531 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:35:01,532 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:35:01,532 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:35:01,532 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:35:01,546 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:01" (1/1) ... [2020-07-20 13:35:01,547 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:01" (1/1) ... [2020-07-20 13:35:01,552 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:01" (1/1) ... [2020-07-20 13:35:01,552 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:01" (1/1) ... [2020-07-20 13:35:01,556 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:01" (1/1) ... [2020-07-20 13:35:01,558 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:01" (1/1) ... [2020-07-20 13:35:01,559 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:01" (1/1) ... [2020-07-20 13:35:01,560 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:35:01,560 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:35:01,561 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:35:01,561 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:35:01,562 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:01" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:35:01,722 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:35:01,722 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:35:01,723 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-20 13:35:01,723 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:35:01,723 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 13:35:01,724 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:35:01,724 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-20 13:35:01,724 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:35:01,725 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:35:01,725 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:35:01,915 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:35:01,916 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 13:35:01,919 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:35:01 BoogieIcfgContainer [2020-07-20 13:35:01,919 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:35:01,920 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:35:01,921 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:35:01,924 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:35:01,924 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:35:01" (1/3) ... [2020-07-20 13:35:01,925 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4500adc2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:35:01, skipping insertion in model container [2020-07-20 13:35:01,926 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:01" (2/3) ... [2020-07-20 13:35:01,926 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4500adc2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:35:01, skipping insertion in model container [2020-07-20 13:35:01,926 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:35:01" (3/3) ... [2020-07-20 13:35:01,928 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_5-2.c [2020-07-20 13:35:01,939 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:35:01,946 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:35:01,961 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:35:01,988 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:35:01,989 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:35:01,989 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:35:01,989 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:35:01,989 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:35:01,990 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:35:01,990 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:35:01,990 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:35:02,007 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-20 13:35:02,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 13:35:02,014 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:02,015 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:02,015 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:02,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:02,022 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-20 13:35:02,030 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:02,030 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [383781954] [2020-07-20 13:35:02,031 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:02,104 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:02,104 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:02,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:35:02,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:02,252 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:35:02,252 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:35:02,254 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [383781954] [2020-07-20 13:35:02,255 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:35:02,255 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:35:02,257 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [801364360] [2020-07-20 13:35:02,265 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:35:02,266 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:02,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:35:02,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:35:02,286 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-20 13:35:02,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:02,403 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 13:35:02,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:35:02,406 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 13:35:02,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:02,416 INFO L225 Difference]: With dead ends: 35 [2020-07-20 13:35:02,416 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 13:35:02,422 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 [2020-07-20 13:35:02,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 13:35:02,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 13:35:02,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 13:35:02,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 13:35:02,475 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-20 13:35:02,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:02,475 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 13:35:02,476 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:35:02,476 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 13:35:02,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 13:35:02,478 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:02,478 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:02,692 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:02,692 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:02,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:02,693 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-20 13:35:02,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:02,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [714450318] [2020-07-20 13:35:02,695 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:02,725 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:02,725 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:02,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:35:02,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:02,766 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:35:02,767 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:35:02,767 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [714450318] [2020-07-20 13:35:02,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:35:02,768 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:35:02,768 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194983373] [2020-07-20 13:35:02,770 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:35:02,771 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:02,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:35:02,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:35:02,772 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-20 13:35:02,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:02,839 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-20 13:35:02,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:35:02,840 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 13:35:02,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:02,841 INFO L225 Difference]: With dead ends: 27 [2020-07-20 13:35:02,842 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 13:35:02,843 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:35:02,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 13:35:02,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-20 13:35:02,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 13:35:02,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 13:35:02,852 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-20 13:35:02,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:02,853 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 13:35:02,853 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:35:02,853 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 13:35:02,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 13:35:02,855 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:02,855 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:03,064 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:03,066 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:03,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:03,067 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-20 13:35:03,069 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:03,069 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [606680057] [2020-07-20 13:35:03,070 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:03,117 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:03,118 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:03,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:35:03,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:03,164 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 13:35:03,165 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:03,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:03,394 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 13:35:03,395 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [606680057] [2020-07-20 13:35:03,395 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:03,395 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 13:35:03,396 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206379166] [2020-07-20 13:35:03,397 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 13:35:03,397 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:03,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 13:35:03,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 13:35:03,398 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-20 13:35:03,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:03,526 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-20 13:35:03,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 13:35:03,526 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-20 13:35:03,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:03,528 INFO L225 Difference]: With dead ends: 32 [2020-07-20 13:35:03,529 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 13:35:03,530 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:35:03,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 13:35:03,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 13:35:03,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 13:35:03,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 13:35:03,539 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-20 13:35:03,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:03,540 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 13:35:03,540 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 13:35:03,540 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 13:35:03,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 13:35:03,542 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:03,542 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:03,756 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:03,757 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:03,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:03,758 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-20 13:35:03,759 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:03,759 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1165195078] [2020-07-20 13:35:03,760 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:03,793 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:03,794 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:03,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:35:03,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:03,848 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 13:35:03,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:04,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:04,034 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 13:35:04,035 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1165195078] [2020-07-20 13:35:04,035 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:04,035 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 13:35:04,036 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1310199270] [2020-07-20 13:35:04,036 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 13:35:04,037 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:04,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 13:35:04,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 13:35:04,037 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-20 13:35:04,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:04,137 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-20 13:35:04,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 13:35:04,138 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 13:35:04,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:04,141 INFO L225 Difference]: With dead ends: 37 [2020-07-20 13:35:04,141 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 13:35:04,142 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:35:04,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 13:35:04,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-20 13:35:04,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 13:35:04,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 13:35:04,151 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-20 13:35:04,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:04,152 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 13:35:04,152 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 13:35:04,152 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 13:35:04,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 13:35:04,154 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:04,154 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:04,368 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:04,369 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:04,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:04,370 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-20 13:35:04,370 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:04,371 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1318148237] [2020-07-20 13:35:04,371 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:04,408 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:04,409 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:04,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:35:04,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:04,457 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 13:35:04,457 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:04,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:04,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:04,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:04,754 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:04,791 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 13:35:04,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1318148237] [2020-07-20 13:35:04,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:04,792 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 13:35:04,792 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819826124] [2020-07-20 13:35:04,793 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 13:35:04,793 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:04,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 13:35:04,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:35:04,794 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-20 13:35:04,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:04,982 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-20 13:35:04,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:35:04,984 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-20 13:35:04,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:04,986 INFO L225 Difference]: With dead ends: 42 [2020-07-20 13:35:04,986 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 13:35:04,987 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:35:04,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 13:35:04,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-20 13:35:04,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 13:35:04,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 13:35:04,998 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-20 13:35:04,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:04,998 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 13:35:04,998 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 13:35:04,999 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 13:35:05,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 13:35:05,001 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:05,001 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:05,216 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:05,218 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:05,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:05,219 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-20 13:35:05,219 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:05,220 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1927786046] [2020-07-20 13:35:05,220 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 [2020-07-20 13:35:05,255 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:05,255 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:05,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:35:05,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:05,308 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-20 13:35:05,308 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:05,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:05,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:05,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:05,626 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 13:35:05,627 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1927786046] [2020-07-20 13:35:05,627 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:05,627 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 13:35:05,628 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194234258] [2020-07-20 13:35:05,628 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 13:35:05,629 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:05,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 13:35:05,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:35:05,629 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-20 13:35:05,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:05,768 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-20 13:35:05,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:35:05,769 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 13:35:05,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:05,772 INFO L225 Difference]: With dead ends: 47 [2020-07-20 13:35:05,772 INFO L226 Difference]: Without dead ends: 43 [2020-07-20 13:35:05,779 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:35:05,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-20 13:35:05,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-20 13:35:05,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 13:35:05,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 13:35:05,804 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-20 13:35:05,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:05,805 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 13:35:05,805 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 13:35:05,805 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 13:35:05,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 13:35:05,810 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:05,810 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:06,011 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:06,012 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:06,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:06,013 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-20 13:35:06,015 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:06,016 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2111194210] [2020-07-20 13:35:06,016 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 [2020-07-20 13:35:06,059 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:06,059 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:06,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:35:06,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:06,117 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-20 13:35:06,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:06,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:06,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:06,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:06,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:06,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:06,731 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-20 13:35:06,731 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2111194210] [2020-07-20 13:35:06,731 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:06,732 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 13:35:06,732 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137420789] [2020-07-20 13:35:06,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 13:35:06,733 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:06,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 13:35:06,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 13:35:06,734 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-20 13:35:06,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:06,903 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-20 13:35:06,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:35:06,904 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-20 13:35:06,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:06,907 INFO L225 Difference]: With dead ends: 52 [2020-07-20 13:35:06,907 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 13:35:06,908 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:35:06,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 13:35:06,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-20 13:35:06,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 13:35:06,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 13:35:06,921 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-20 13:35:06,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:06,922 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 13:35:06,922 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 13:35:06,922 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 13:35:06,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-20 13:35:06,925 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:06,925 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:07,140 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:07,141 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:07,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:07,141 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-20 13:35:07,142 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:07,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1493195757] [2020-07-20 13:35:07,142 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 [2020-07-20 13:35:07,204 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:07,205 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:07,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:35:07,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:07,294 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-20 13:35:07,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:07,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:07,866 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:07,867 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:07,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:07,959 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-20 13:35:07,959 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1493195757] [2020-07-20 13:35:07,960 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:07,960 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 12 [2020-07-20 13:35:07,960 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729298181] [2020-07-20 13:35:07,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 13:35:07,963 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:07,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 13:35:07,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:35:07,967 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 12 states. [2020-07-20 13:35:08,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:08,108 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-20 13:35:08,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:35:08,111 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 96 [2020-07-20 13:35:08,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:08,113 INFO L225 Difference]: With dead ends: 57 [2020-07-20 13:35:08,114 INFO L226 Difference]: Without dead ends: 53 [2020-07-20 13:35:08,115 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 9 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=85, Invalid=155, Unknown=0, NotChecked=0, Total=240 [2020-07-20 13:35:08,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-20 13:35:08,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-20 13:35:08,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 13:35:08,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 13:35:08,128 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-20 13:35:08,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:08,128 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 13:35:08,129 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 13:35:08,129 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 13:35:08,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 13:35:08,131 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:08,131 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:08,344 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:08,345 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:08,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:08,347 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-20 13:35:08,347 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:08,348 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [56615340] [2020-07-20 13:35:08,348 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 [2020-07-20 13:35:08,409 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:08,410 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:08,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:35:08,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:08,497 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-20 13:35:08,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:09,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:09,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:09,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:09,373 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:09,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:09,499 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-20 13:35:09,499 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [56615340] [2020-07-20 13:35:09,500 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:09,500 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-20 13:35:09,500 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510193479] [2020-07-20 13:35:09,501 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 13:35:09,502 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:09,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 13:35:09,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:35:09,503 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 14 states. [2020-07-20 13:35:09,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:09,721 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-20 13:35:09,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:35:09,721 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 117 [2020-07-20 13:35:09,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:09,724 INFO L225 Difference]: With dead ends: 62 [2020-07-20 13:35:09,724 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 13:35:09,729 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:35:09,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 13:35:09,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-20 13:35:09,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 13:35:09,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 13:35:09,760 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-20 13:35:09,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:09,761 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 13:35:09,761 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 13:35:09,761 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 13:35:09,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-20 13:35:09,766 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:09,766 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:09,967 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:09,968 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:09,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:09,968 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-20 13:35:09,969 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:09,969 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [666117594] [2020-07-20 13:35:09,970 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 [2020-07-20 13:35:10,055 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:10,055 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:10,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:35:10,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:10,179 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 221 proven. 407 refuted. 0 times theorem prover too weak. 1298 trivial. 0 not checked. [2020-07-20 13:35:10,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:10,888 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:11,048 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:11,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:11,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:11,147 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:11,203 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:11,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:11,277 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:11,342 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 223 proven. 427 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2020-07-20 13:35:11,343 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [666117594] [2020-07-20 13:35:11,343 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:11,343 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-20 13:35:11,344 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622430934] [2020-07-20 13:35:11,346 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 13:35:11,346 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:11,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 13:35:11,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:35:11,347 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 14 states. [2020-07-20 13:35:11,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:11,560 INFO L93 Difference]: Finished difference Result 88 states and 260 transitions. [2020-07-20 13:35:11,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:35:11,560 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 190 [2020-07-20 13:35:11,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:11,563 INFO L225 Difference]: With dead ends: 88 [2020-07-20 13:35:11,563 INFO L226 Difference]: Without dead ends: 49 [2020-07-20 13:35:11,569 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:35:11,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-20 13:35:11,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-07-20 13:35:11,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-07-20 13:35:11,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 70 transitions. [2020-07-20 13:35:11,581 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 70 transitions. Word has length 190 [2020-07-20 13:35:11,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:11,582 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 70 transitions. [2020-07-20 13:35:11,582 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 13:35:11,582 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 70 transitions. [2020-07-20 13:35:11,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-07-20 13:35:11,586 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:11,586 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 15, 9, 9, 9, 9, 9, 9, 9, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:11,799 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:11,800 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:11,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:11,801 INFO L82 PathProgramCache]: Analyzing trace with hash -1040445716, now seen corresponding path program 5 times [2020-07-20 13:35:11,802 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:11,802 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1123449444] [2020-07-20 13:35:11,802 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 [2020-07-20 13:35:11,884 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:35:11,885 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:11,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:35:11,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:11,974 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 274 proven. 104 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2020-07-20 13:35:11,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:12,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:12,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:12,823 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:12,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:12,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:12,932 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:13,023 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 274 proven. 130 refuted. 0 times theorem prover too weak. 529 trivial. 0 not checked. [2020-07-20 13:35:13,024 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1123449444] [2020-07-20 13:35:13,024 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:13,024 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-20 13:35:13,024 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670738583] [2020-07-20 13:35:13,025 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 13:35:13,026 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:13,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 13:35:13,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:35:13,026 INFO L87 Difference]: Start difference. First operand 49 states and 70 transitions. Second operand 14 states. [2020-07-20 13:35:13,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:13,197 INFO L93 Difference]: Finished difference Result 67 states and 91 transitions. [2020-07-20 13:35:13,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:35:13,198 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 136 [2020-07-20 13:35:13,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:13,200 INFO L225 Difference]: With dead ends: 67 [2020-07-20 13:35:13,200 INFO L226 Difference]: Without dead ends: 60 [2020-07-20 13:35:13,202 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 248 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:35:13,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-20 13:35:13,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2020-07-20 13:35:13,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-20 13:35:13,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 77 transitions. [2020-07-20 13:35:13,211 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 77 transitions. Word has length 136 [2020-07-20 13:35:13,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:13,212 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 77 transitions. [2020-07-20 13:35:13,212 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 13:35:13,212 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 77 transitions. [2020-07-20 13:35:13,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 13:35:13,214 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:13,214 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:13,428 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:13,429 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:13,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:13,430 INFO L82 PathProgramCache]: Analyzing trace with hash 1200034344, now seen corresponding path program 6 times [2020-07-20 13:35:13,430 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:13,430 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1563907949] [2020-07-20 13:35:13,431 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 [2020-07-20 13:35:13,517 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:35:13,517 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 13:35:13,518 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 13:35:13,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 13:35:13,542 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 13:35:13,571 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 13:35:13,572 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 13:35:13,786 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:13,827 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 01:35:13 BoogieIcfgContainer [2020-07-20 13:35:13,827 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 13:35:13,830 INFO L168 Benchmark]: Toolchain (without parser) took 12625.81 ms. Allocated memory was 142.1 MB in the beginning and 360.2 MB in the end (delta: 218.1 MB). Free memory was 99.8 MB in the beginning and 160.9 MB in the end (delta: -61.1 MB). Peak memory consumption was 157.0 MB. Max. memory is 7.1 GB. [2020-07-20 13:35:13,831 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 142.1 MB. Free memory was 118.3 MB in the beginning and 118.1 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-20 13:35:13,832 INFO L168 Benchmark]: CACSL2BoogieTranslator took 324.77 ms. Allocated memory is still 142.1 MB. Free memory was 99.4 MB in the beginning and 90.1 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-20 13:35:13,832 INFO L168 Benchmark]: Boogie Preprocessor took 27.87 ms. Allocated memory is still 142.1 MB. Free memory was 90.1 MB in the beginning and 88.8 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-20 13:35:13,833 INFO L168 Benchmark]: RCFGBuilder took 358.88 ms. Allocated memory was 142.1 MB in the beginning and 199.2 MB in the end (delta: 57.1 MB). Free memory was 88.8 MB in the beginning and 166.5 MB in the end (delta: -77.7 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. [2020-07-20 13:35:13,834 INFO L168 Benchmark]: TraceAbstraction took 11906.42 ms. Allocated memory was 199.2 MB in the beginning and 360.2 MB in the end (delta: 161.0 MB). Free memory was 165.8 MB in the beginning and 160.9 MB in the end (delta: 4.9 MB). Peak memory consumption was 165.8 MB. Max. memory is 7.1 GB. [2020-07-20 13:35:13,837 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 142.1 MB. Free memory was 118.3 MB in the beginning and 118.1 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 324.77 ms. Allocated memory is still 142.1 MB. Free memory was 99.4 MB in the beginning and 90.1 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 27.87 ms. Allocated memory is still 142.1 MB. Free memory was 90.1 MB in the beginning and 88.8 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 358.88 ms. Allocated memory was 142.1 MB in the beginning and 199.2 MB in the end (delta: 57.1 MB). Free memory was 88.8 MB in the beginning and 166.5 MB in the end (delta: -77.7 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 11906.42 ms. Allocated memory was 199.2 MB in the beginning and 360.2 MB in the end (delta: 161.0 MB). Free memory was 165.8 MB in the beginning and 160.9 MB in the end (delta: 4.9 MB). Peak memory consumption was 165.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 27]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L24] int x = 5; VAL [x=5] [L25] CALL, EXPR fibo(x) VAL [\old(n)=5] [L6] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L8] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=4] [L6] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L8] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=3] [L6] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L8] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=4, fibo(n-1)=2, n=4] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=4, fibo(n-1)=2, fibo(n-2)=1, n=4] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=5, fibo(n-1)=3, n=5] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=3] [L6] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L8] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=5, fibo(n-1)=3, fibo(n-2)=2, n=5] [L11] return fibo(n-1) + fibo(n-2); [L25] RET, EXPR fibo(x) VAL [fibo(x)=5, x=5] [L25] int result = fibo(x); [L26] COND TRUE result == 5 VAL [result=5, x=5] [L27] __VERIFIER_error() VAL [result=5, x=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 11.8s, OverallIterations: 12, TraceHistogramMax: 27, AutomataDifference: 1.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 194 SDtfs, 337 SDslu, 648 SDs, 0 SdLazy, 710 SolverSat, 366 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1534 GetRequests, 1334 SyntacticMatches, 70 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 313 ImplicationChecksByTransitivity, 1.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=54occurred in iteration=11, 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, 11 MinimizatonAttempts, 82 StatesRemovedByMinimization, 9 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 6.3s InterpolantComputationTime, 873 NumberOfCodeBlocks, 731 NumberOfCodeBlocksAsserted, 38 NumberOfCheckSat, 1481 ConstructedInterpolants, 0 QuantifiedInterpolants, 301111 SizeOfPredicates, 46 NumberOfNonLiveVariables, 1491 ConjunctsInSsa, 92 ConjunctsInUnsatCore, 20 InterpolantComputations, 2 PerfectInterpolantSequences, 6304/8528 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...