/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 22:19:06,353 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 22:19:06,356 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 22:19:06,371 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 22:19:06,372 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 22:19:06,373 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 22:19:06,375 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 22:19:06,377 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 22:19:06,379 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 22:19:06,380 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 22:19:06,381 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 22:19:06,382 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 22:19:06,382 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 22:19:06,384 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 22:19:06,385 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 22:19:06,386 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 22:19:06,387 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 22:19:06,388 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 22:19:06,390 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 22:19:06,392 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 22:19:06,394 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 22:19:06,395 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 22:19:06,397 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 22:19:06,398 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 22:19:06,401 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 22:19:06,409 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 22:19:06,411 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 22:19:06,411 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 22:19:06,412 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 22:19:06,428 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 22:19:06,429 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 22:19:06,430 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 22:19:06,430 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 22:19:06,430 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 22:19:06,431 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 22:19:06,431 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 22:19:06,431 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 22:19:06,431 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 22:19:06,431 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 22:19:06,432 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 22:19:06,432 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 22:19:06,432 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 22:19:06,432 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 22:19:06,432 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 22:19:06,433 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 22:19:06,433 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 22:19:06,433 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 22:19:06,433 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 22:19:06,433 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 22:19:06,434 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 22:19:06,434 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:19:06,434 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 22:19:06,434 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 22:19:06,434 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 22:19:06,435 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 22:19:06,435 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:06,435 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 22:19:06,435 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 22:19:06,435 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 22:19:06,755 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 22:19:06,770 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 22:19:06,774 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 22:19:06,775 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 22:19:06,776 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 22:19:06,777 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c [2020-07-21 22:19:06,849 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ec0ad7b5a/72fc27280da74d85a428b2fcd4038d20/FLAGd6c0affaa [2020-07-21 22:19:07,316 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 22:19:07,316 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c [2020-07-21 22:19:07,328 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ec0ad7b5a/72fc27280da74d85a428b2fcd4038d20/FLAGd6c0affaa [2020-07-21 22:19:07,684 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ec0ad7b5a/72fc27280da74d85a428b2fcd4038d20 [2020-07-21 22:19:07,697 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 22:19:07,701 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 22:19:07,703 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 22:19:07,703 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 22:19:07,707 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 22:19:07,709 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:19:07" (1/1) ... [2020-07-21 22:19:07,712 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@419ad10c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:07, skipping insertion in model container [2020-07-21 22:19:07,713 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:19:07" (1/1) ... [2020-07-21 22:19:07,724 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 22:19:07,750 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 22:19:07,981 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:19:07,986 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 22:19:08,004 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:19:08,017 INFO L208 MainTranslator]: Completed translation [2020-07-21 22:19:08,017 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:08 WrapperNode [2020-07-21 22:19:08,017 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 22:19:08,018 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 22:19:08,018 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 22:19:08,019 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 22:19:08,034 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:08" (1/1) ... [2020-07-21 22:19:08,034 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:08" (1/1) ... [2020-07-21 22:19:08,039 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:08" (1/1) ... [2020-07-21 22:19:08,040 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:08" (1/1) ... [2020-07-21 22:19:08,044 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:08" (1/1) ... [2020-07-21 22:19:08,047 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:08" (1/1) ... [2020-07-21 22:19:08,048 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:08" (1/1) ... [2020-07-21 22:19:08,050 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 22:19:08,050 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 22:19:08,051 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 22:19:08,051 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 22:19:08,052 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:08" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:19:08,221 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 22:19:08,221 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 22:19:08,221 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 22:19:08,221 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 22:19:08,222 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 22:19:08,222 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 22:19:08,222 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 22:19:08,222 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 22:19:08,222 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 22:19:08,222 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 22:19:08,223 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 22:19:08,223 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 22:19:08,446 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 22:19:08,446 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 22:19:08,450 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:19:08 BoogieIcfgContainer [2020-07-21 22:19:08,451 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 22:19:08,452 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 22:19:08,452 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 22:19:08,456 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 22:19:08,456 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:19:07" (1/3) ... [2020-07-21 22:19:08,457 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@772dedfb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:19:08, skipping insertion in model container [2020-07-21 22:19:08,458 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:08" (2/3) ... [2020-07-21 22:19:08,458 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@772dedfb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:19:08, skipping insertion in model container [2020-07-21 22:19:08,458 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:19:08" (3/3) ... [2020-07-21 22:19:08,460 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_4-2.c [2020-07-21 22:19:08,472 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 22:19:08,481 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 22:19:08,496 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 22:19:08,524 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 22:19:08,524 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 22:19:08,525 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 22:19:08,525 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 22:19:08,525 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 22:19:08,525 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 22:19:08,525 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 22:19:08,525 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 22:19:08,547 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 22:19:08,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 22:19:08,555 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:08,556 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:08,557 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:08,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:08,565 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 22:19:08,574 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:08,575 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1025638007] [2020-07-21 22:19:08,575 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:08,652 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:08,652 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:08,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:19:08,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:08,767 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:19:08,768 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:19:08,769 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1025638007] [2020-07-21 22:19:08,770 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:19:08,770 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:19:08,772 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112700527] [2020-07-21 22:19:08,780 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:19:08,781 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:08,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:19:08,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:19:08,802 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 22:19:08,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:08,940 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 22:19:08,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:19:08,943 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 22:19:08,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:08,955 INFO L225 Difference]: With dead ends: 44 [2020-07-21 22:19:08,955 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 22:19:08,960 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 22:19:08,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 22:19:09,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 22:19:09,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 22:19:09,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 22:19:09,017 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 22:19:09,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:09,018 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 22:19:09,019 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:19:09,019 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 22:19:09,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 22:19:09,021 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:09,021 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:09,239 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:09,239 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:09,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:09,240 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 22:19:09,241 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:09,242 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1868043938] [2020-07-21 22:19:09,242 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:09,296 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:19:09,297 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:09,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:19:09,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:09,350 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:19:09,350 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:19:09,355 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1868043938] [2020-07-21 22:19:09,355 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:19:09,355 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:19:09,356 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047449451] [2020-07-21 22:19:09,359 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:19:09,359 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:09,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:19:09,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:19:09,360 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 22:19:09,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:09,451 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 22:19:09,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:19:09,453 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 22:19:09,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:09,454 INFO L225 Difference]: With dead ends: 36 [2020-07-21 22:19:09,455 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 22:19:09,457 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 [2020-07-21 22:19:09,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 22:19:09,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 22:19:09,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 22:19:09,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 22:19:09,480 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 22:19:09,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:09,482 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 22:19:09,483 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:19:09,483 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 22:19:09,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 22:19:09,485 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:09,487 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:09,702 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:09,703 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:09,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:09,704 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 22:19:09,705 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:09,705 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [395737295] [2020-07-21 22:19:09,706 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:09,737 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:09,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:09,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 22:19:09,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:09,832 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 22:19:09,833 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:10,078 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:10,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:10,136 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 22:19:10,137 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [395737295] [2020-07-21 22:19:10,137 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:10,138 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 22:19:10,138 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282338288] [2020-07-21 22:19:10,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 22:19:10,139 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:10,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 22:19:10,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 22:19:10,140 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-21 22:19:10,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:10,275 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 22:19:10,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 22:19:10,276 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-21 22:19:10,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:10,278 INFO L225 Difference]: With dead ends: 41 [2020-07-21 22:19:10,278 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 22:19:10,279 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 22:19:10,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 22:19:10,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 22:19:10,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 22:19:10,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 22:19:10,289 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 22:19:10,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:10,290 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 22:19:10,290 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 22:19:10,290 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 22:19:10,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 22:19:10,292 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:10,292 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:10,505 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:10,506 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:10,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:10,507 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 22:19:10,507 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:10,507 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1124489527] [2020-07-21 22:19:10,507 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:10,535 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:10,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:10,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 22:19:10,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:10,589 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 22:19:10,590 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:10,733 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:10,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:10,771 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 22:19:10,771 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1124489527] [2020-07-21 22:19:10,772 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:10,772 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 22:19:10,772 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020195334] [2020-07-21 22:19:10,773 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 22:19:10,773 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:10,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 22:19:10,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 22:19:10,774 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-21 22:19:10,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:10,905 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-21 22:19:10,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 22:19:10,906 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 22:19:10,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:10,908 INFO L225 Difference]: With dead ends: 46 [2020-07-21 22:19:10,908 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 22:19:10,909 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 22:19:10,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 22:19:10,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-21 22:19:10,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 22:19:10,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 22:19:10,921 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-21 22:19:10,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:10,921 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 22:19:10,921 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 22:19:10,922 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 22:19:10,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 22:19:10,928 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:10,929 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:11,144 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:11,145 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:11,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:11,146 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-21 22:19:11,147 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:11,147 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1236057961] [2020-07-21 22:19:11,148 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:11,185 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:11,185 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:11,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:19:11,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:11,263 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 22:19:11,264 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:11,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:11,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:11,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:11,631 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 22:19:11,632 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1236057961] [2020-07-21 22:19:11,632 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:11,632 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 22:19:11,633 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1833846623] [2020-07-21 22:19:11,633 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 22:19:11,633 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:11,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 22:19:11,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 22:19:11,634 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-21 22:19:11,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:11,799 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-21 22:19:11,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:19:11,799 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-21 22:19:11,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:11,801 INFO L225 Difference]: With dead ends: 51 [2020-07-21 22:19:11,802 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 22:19:11,802 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:19:11,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 22:19:11,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-21 22:19:11,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 22:19:11,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 22:19:11,813 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-21 22:19:11,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:11,813 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 22:19:11,813 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 22:19:11,814 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 22:19:11,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 22:19:11,816 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:11,816 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:12,030 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:12,032 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:12,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:12,033 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-21 22:19:12,033 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:12,034 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [443980403] [2020-07-21 22:19:12,034 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:12,064 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:12,064 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:12,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:19:12,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:12,119 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 22:19:12,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:12,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:12,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:12,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:12,438 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 22:19:12,438 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [443980403] [2020-07-21 22:19:12,439 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:12,439 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 22:19:12,439 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837767894] [2020-07-21 22:19:12,440 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 22:19:12,440 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:12,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 22:19:12,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:19:12,441 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 11 states. [2020-07-21 22:19:12,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:12,608 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-21 22:19:12,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:19:12,608 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 40 [2020-07-21 22:19:12,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:12,610 INFO L225 Difference]: With dead ends: 56 [2020-07-21 22:19:12,610 INFO L226 Difference]: Without dead ends: 52 [2020-07-21 22:19:12,611 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:19:12,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-21 22:19:12,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-21 22:19:12,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 22:19:12,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 22:19:12,624 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-21 22:19:12,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:12,625 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 22:19:12,625 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 22:19:12,625 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 22:19:12,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-21 22:19:12,628 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:12,628 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:12,841 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:12,842 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:12,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:12,842 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-21 22:19:12,842 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:12,843 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1928267820] [2020-07-21 22:19:12,843 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:12,883 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:12,883 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:12,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:19:12,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:12,982 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 22:19:12,983 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:13,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:13,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:13,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:13,522 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:13,578 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 22:19:13,579 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1928267820] [2020-07-21 22:19:13,579 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:13,579 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 22:19:13,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358796316] [2020-07-21 22:19:13,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:19:13,580 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:13,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:19:13,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:19:13,581 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 13 states. [2020-07-21 22:19:13,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:13,789 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-21 22:19:13,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:19:13,790 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 52 [2020-07-21 22:19:13,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:13,792 INFO L225 Difference]: With dead ends: 61 [2020-07-21 22:19:13,792 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 22:19:13,795 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:19:13,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 22:19:13,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-21 22:19:13,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 22:19:13,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-21 22:19:13,814 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-21 22:19:13,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:13,815 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-21 22:19:13,815 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:19:13,815 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-21 22:19:13,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-21 22:19:13,821 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:13,824 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:14,025 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:14,025 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:14,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:14,026 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-21 22:19:14,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:14,028 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1021841457] [2020-07-21 22:19:14,028 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:14,069 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:19:14,069 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:14,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:19:14,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:14,142 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 22:19:14,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:14,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:14,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:14,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:14,452 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:14,474 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 13 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2020-07-21 22:19:14,475 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1021841457] [2020-07-21 22:19:14,475 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:14,475 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 22:19:14,475 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567160436] [2020-07-21 22:19:14,476 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 22:19:14,476 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:14,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 22:19:14,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:19:14,477 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 11 states. [2020-07-21 22:19:14,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:14,645 INFO L93 Difference]: Finished difference Result 69 states and 116 transitions. [2020-07-21 22:19:14,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:19:14,645 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 54 [2020-07-21 22:19:14,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:14,650 INFO L225 Difference]: With dead ends: 69 [2020-07-21 22:19:14,650 INFO L226 Difference]: Without dead ends: 65 [2020-07-21 22:19:14,651 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 94 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:19:14,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-07-21 22:19:14,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 47. [2020-07-21 22:19:14,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-21 22:19:14,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 68 transitions. [2020-07-21 22:19:14,681 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 68 transitions. Word has length 54 [2020-07-21 22:19:14,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:14,681 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 68 transitions. [2020-07-21 22:19:14,681 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 22:19:14,682 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 68 transitions. [2020-07-21 22:19:14,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-21 22:19:14,686 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:14,686 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:14,887 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:14,888 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:14,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:14,889 INFO L82 PathProgramCache]: Analyzing trace with hash -242988780, now seen corresponding path program 1 times [2020-07-21 22:19:14,889 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:14,890 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2017472686] [2020-07-21 22:19:14,890 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:14,933 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:19:14,933 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:14,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 22:19:14,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:14,988 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 18 proven. 5 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2020-07-21 22:19:14,988 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:15,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:15,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:15,203 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 18 proven. 5 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2020-07-21 22:19:15,203 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2017472686] [2020-07-21 22:19:15,204 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:15,204 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-21 22:19:15,204 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265778425] [2020-07-21 22:19:15,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 22:19:15,205 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:15,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 22:19:15,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-21 22:19:15,206 INFO L87 Difference]: Start difference. First operand 47 states and 68 transitions. Second operand 9 states. [2020-07-21 22:19:15,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:15,334 INFO L93 Difference]: Finished difference Result 61 states and 93 transitions. [2020-07-21 22:19:15,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 22:19:15,335 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 55 [2020-07-21 22:19:15,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:15,337 INFO L225 Difference]: With dead ends: 61 [2020-07-21 22:19:15,337 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 22:19:15,338 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 98 SyntacticMatches, 5 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:19:15,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 22:19:15,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 49. [2020-07-21 22:19:15,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-07-21 22:19:15,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 73 transitions. [2020-07-21 22:19:15,348 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 73 transitions. Word has length 55 [2020-07-21 22:19:15,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:15,349 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 73 transitions. [2020-07-21 22:19:15,349 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 22:19:15,349 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 73 transitions. [2020-07-21 22:19:15,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 22:19:15,350 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:15,351 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:15,563 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:15,564 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:15,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:15,565 INFO L82 PathProgramCache]: Analyzing trace with hash 643857677, now seen corresponding path program 1 times [2020-07-21 22:19:15,565 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:15,566 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1230687319] [2020-07-21 22:19:15,567 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:15,611 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:19:15,612 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:15,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:19:15,616 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:15,692 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 30 proven. 11 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2020-07-21 22:19:15,693 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:15,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:15,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:16,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:16,039 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 30 proven. 12 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-21 22:19:16,040 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1230687319] [2020-07-21 22:19:16,040 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:16,040 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 22:19:16,040 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1246809007] [2020-07-21 22:19:16,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 22:19:16,041 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:16,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 22:19:16,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:19:16,041 INFO L87 Difference]: Start difference. First operand 49 states and 73 transitions. Second operand 11 states. [2020-07-21 22:19:16,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:16,193 INFO L93 Difference]: Finished difference Result 66 states and 108 transitions. [2020-07-21 22:19:16,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:19:16,194 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 67 [2020-07-21 22:19:16,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:16,196 INFO L225 Difference]: With dead ends: 66 [2020-07-21 22:19:16,196 INFO L226 Difference]: Without dead ends: 62 [2020-07-21 22:19:16,197 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 117 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:19:16,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-21 22:19:16,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 52. [2020-07-21 22:19:16,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-07-21 22:19:16,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 80 transitions. [2020-07-21 22:19:16,207 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 80 transitions. Word has length 67 [2020-07-21 22:19:16,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:16,208 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 80 transitions. [2020-07-21 22:19:16,208 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 22:19:16,208 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 80 transitions. [2020-07-21 22:19:16,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 22:19:16,210 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:16,210 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:16,423 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:16,424 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:16,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:16,425 INFO L82 PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 2 times [2020-07-21 22:19:16,426 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:16,426 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [25780332] [2020-07-21 22:19:16,426 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:16,473 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:19:16,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 22:19:16,473 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 22:19:16,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 22:19:16,490 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 22:19:16,536 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 22:19:16,537 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 22:19:16,750 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:16,786 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 10:19:16 BoogieIcfgContainer [2020-07-21 22:19:16,786 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 22:19:16,789 INFO L168 Benchmark]: Toolchain (without parser) took 9089.40 ms. Allocated memory was 145.2 MB in the beginning and 282.6 MB in the end (delta: 137.4 MB). Free memory was 103.2 MB in the beginning and 119.5 MB in the end (delta: -16.4 MB). Peak memory consumption was 121.0 MB. Max. memory is 7.1 GB. [2020-07-21 22:19:16,790 INFO L168 Benchmark]: CDTParser took 0.28 ms. Allocated memory is still 145.2 MB. Free memory was 121.4 MB in the beginning and 121.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 22:19:16,790 INFO L168 Benchmark]: CACSL2BoogieTranslator took 314.97 ms. Allocated memory is still 145.2 MB. Free memory was 102.7 MB in the beginning and 93.1 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-21 22:19:16,791 INFO L168 Benchmark]: Boogie Preprocessor took 31.85 ms. Allocated memory is still 145.2 MB. Free memory was 93.1 MB in the beginning and 91.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-21 22:19:16,792 INFO L168 Benchmark]: RCFGBuilder took 400.49 ms. Allocated memory was 145.2 MB in the beginning and 202.4 MB in the end (delta: 57.1 MB). Free memory was 91.8 MB in the beginning and 168.0 MB in the end (delta: -76.1 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-07-21 22:19:16,793 INFO L168 Benchmark]: TraceAbstraction took 8333.70 ms. Allocated memory was 202.4 MB in the beginning and 282.6 MB in the end (delta: 80.2 MB). Free memory was 167.3 MB in the beginning and 119.5 MB in the end (delta: 47.8 MB). Peak memory consumption was 128.0 MB. Max. memory is 7.1 GB. [2020-07-21 22:19:16,797 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28 ms. Allocated memory is still 145.2 MB. Free memory was 121.4 MB in the beginning and 121.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 314.97 ms. Allocated memory is still 145.2 MB. Free memory was 102.7 MB in the beginning and 93.1 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 31.85 ms. Allocated memory is still 145.2 MB. Free memory was 93.1 MB in the beginning and 91.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 400.49 ms. Allocated memory was 145.2 MB in the beginning and 202.4 MB in the end (delta: 57.1 MB). Free memory was 91.8 MB in the beginning and 168.0 MB in the end (delta: -76.1 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 8333.70 ms. Allocated memory was 202.4 MB in the beginning and 282.6 MB in the end (delta: 80.2 MB). Free memory was 167.3 MB in the beginning and 119.5 MB in the end (delta: 47.8 MB). Peak memory consumption was 128.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 4; VAL [x=4] [L37] CALL, EXPR fibo1(x) VAL [\old(n)=4] [L8] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L10] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) VAL [fibo1(x)=3, x=4] [L37] int result = fibo1(x); [L38] COND TRUE result == 3 VAL [result=3, x=4] [L39] __VERIFIER_error() VAL [result=3, x=4] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 8.2s, OverallIterations: 11, TraceHistogramMax: 5, AutomataDifference: 1.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 228 SDtfs, 285 SDslu, 912 SDs, 0 SdLazy, 814 SolverSat, 166 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 774 GetRequests, 624 SyntacticMatches, 49 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 1.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=52occurred in iteration=10, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 10 MinimizatonAttempts, 78 StatesRemovedByMinimization, 9 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 3.4s InterpolantComputationTime, 455 NumberOfCodeBlocks, 330 NumberOfCodeBlocksAsserted, 29 NumberOfCheckSat, 729 ConstructedInterpolants, 0 QuantifiedInterpolants, 72411 SizeOfPredicates, 34 NumberOfNonLiveVariables, 596 ConjunctsInSsa, 68 ConjunctsInUnsatCore, 18 InterpolantComputations, 2 PerfectInterpolantSequences, 345/500 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...