/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 NOT_INCREMENTALLY -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 10:57:28,503 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 10:57:28,506 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 10:57:28,527 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 10:57:28,527 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 10:57:28,529 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 10:57:28,531 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 10:57:28,533 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 10:57:28,535 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 10:57:28,535 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 10:57:28,536 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 10:57:28,537 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 10:57:28,538 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 10:57:28,539 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 10:57:28,540 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 10:57:28,541 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 10:57:28,542 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 10:57:28,543 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 10:57:28,545 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 10:57:28,547 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 10:57:28,549 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 10:57:28,550 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 10:57:28,551 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 10:57:28,552 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 10:57:28,555 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 10:57:28,562 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 10:57:28,563 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 10:57:28,564 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 10:57:28,565 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 10:57:28,582 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 10:57:28,582 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 10:57:28,584 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 10:57:28,584 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 10:57:28,584 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 10:57:28,584 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 10:57:28,584 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 10:57:28,585 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 10:57:28,585 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 10:57:28,585 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 10:57:28,585 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 10:57:28,585 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 10:57:28,586 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 10:57:28,586 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 10:57:28,586 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 10:57:28,586 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 10:57:28,586 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 10:57:28,587 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 10:57:28,587 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 10:57:28,587 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 10:57:28,587 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 10:57:28,587 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 10:57:28,588 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 10:57:28,588 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 10:57:28,588 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 10:57:28,588 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 10:57:28,588 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:57:28,589 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 10:57:28,589 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 10:57:28,589 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 -> NOT_INCREMENTALLY [2020-07-21 10:57:28,901 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 10:57:28,924 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 10:57:28,928 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 10:57:28,929 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 10:57:28,932 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 10:57:28,932 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c [2020-07-21 10:57:29,002 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9d56ce9f0/8f4bfa294add4a7aad29e3a83436eb5c/FLAG4ceb70e44 [2020-07-21 10:57:29,530 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 10:57:29,531 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c [2020-07-21 10:57:29,539 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9d56ce9f0/8f4bfa294add4a7aad29e3a83436eb5c/FLAG4ceb70e44 [2020-07-21 10:57:29,894 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9d56ce9f0/8f4bfa294add4a7aad29e3a83436eb5c [2020-07-21 10:57:29,904 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 10:57:29,907 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 10:57:29,908 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 10:57:29,909 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 10:57:29,913 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 10:57:29,914 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:57:29" (1/1) ... [2020-07-21 10:57:29,917 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@ae6d6b0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:57:29, skipping insertion in model container [2020-07-21 10:57:29,917 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:57:29" (1/1) ... [2020-07-21 10:57:29,925 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 10:57:29,943 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 10:57:30,150 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 10:57:30,159 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 10:57:30,184 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 10:57:30,204 INFO L208 MainTranslator]: Completed translation [2020-07-21 10:57:30,205 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:57:30 WrapperNode [2020-07-21 10:57:30,205 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 10:57:30,206 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 10:57:30,206 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 10:57:30,207 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 10:57:30,224 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:57:30" (1/1) ... [2020-07-21 10:57:30,226 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:57:30" (1/1) ... [2020-07-21 10:57:30,347 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:57:30" (1/1) ... [2020-07-21 10:57:30,348 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:57:30" (1/1) ... [2020-07-21 10:57:30,354 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:57:30" (1/1) ... [2020-07-21 10:57:30,357 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:57:30" (1/1) ... [2020-07-21 10:57:30,363 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:57:30" (1/1) ... [2020-07-21 10:57:30,365 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 10:57:30,365 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 10:57:30,365 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 10:57:30,366 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 10:57:30,367 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:57:30" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 10:57:30,439 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 10:57:30,440 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 10:57:30,440 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 10:57:30,440 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 10:57:30,440 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 10:57:30,440 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 10:57:30,440 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 10:57:30,441 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 10:57:30,441 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 10:57:30,441 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 10:57:30,441 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 10:57:30,441 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 10:57:30,649 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 10:57:30,649 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 10:57:30,654 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:57:30 BoogieIcfgContainer [2020-07-21 10:57:30,655 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 10:57:30,657 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 10:57:30,657 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 10:57:30,660 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 10:57:30,661 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:57:29" (1/3) ... [2020-07-21 10:57:30,662 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e3f7d7f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:57:30, skipping insertion in model container [2020-07-21 10:57:30,662 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:57:30" (2/3) ... [2020-07-21 10:57:30,662 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e3f7d7f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:57:30, skipping insertion in model container [2020-07-21 10:57:30,662 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:57:30" (3/3) ... [2020-07-21 10:57:30,665 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_4-2.c [2020-07-21 10:57:30,677 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 10:57:30,687 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 10:57:30,706 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 10:57:30,737 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 10:57:30,738 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 10:57:30,739 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 10:57:30,739 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 10:57:30,739 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 10:57:30,739 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 10:57:30,740 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 10:57:30,740 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 10:57:30,799 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 10:57:30,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 10:57:30,813 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:57:30,815 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:57:30,816 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:57:30,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:57:30,825 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 10:57:30,837 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:57:30,837 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1517201136] [2020-07-21 10:57:30,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:57:30,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:57:30,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 10:57:30,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:57:31,030 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 10:57:31,030 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 10:57:31,032 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1517201136] [2020-07-21 10:57:31,032 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 10:57:31,033 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 10:57:31,034 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474829684] [2020-07-21 10:57:31,039 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 10:57:31,040 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:57:31,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 10:57:31,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 10:57:31,058 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 10:57:31,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:57:31,195 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 10:57:31,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 10:57:31,199 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 10:57:31,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:57:31,219 INFO L225 Difference]: With dead ends: 44 [2020-07-21 10:57:31,220 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 10:57:31,226 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 10:57:31,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 10:57:31,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 10:57:31,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 10:57:31,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 10:57:31,278 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 10:57:31,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:57:31,279 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 10:57:31,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 10:57:31,279 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 10:57:31,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 10:57:31,282 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:57:31,282 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:57:31,498 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:57:31,498 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:57:31,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:57:31,499 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 10:57:31,500 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:57:31,500 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [564763959] [2020-07-21 10:57:31,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:57:31,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:57:31,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 10:57:31,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:57:31,565 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 10:57:31,566 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 10:57:31,566 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [564763959] [2020-07-21 10:57:31,567 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 10:57:31,567 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 10:57:31,567 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366785565] [2020-07-21 10:57:31,571 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 10:57:31,572 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:57:31,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 10:57:31,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 10:57:31,573 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 10:57:31,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:57:31,669 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 10:57:31,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 10:57:31,670 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 10:57:31,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:57:31,672 INFO L225 Difference]: With dead ends: 36 [2020-07-21 10:57:31,672 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 10:57:31,675 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 10:57:31,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 10:57:31,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 10:57:31,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 10:57:31,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 10:57:31,686 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 10:57:31,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:57:31,686 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 10:57:31,686 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 10:57:31,687 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 10:57:31,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 10:57:31,688 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:57:31,689 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 10:57:31,892 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:57:31,894 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:57:31,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:57:31,895 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 10:57:31,896 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:57:31,896 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1641196489] [2020-07-21 10:57:31,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:57:31,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:57:31,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 10:57:31,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:57:32,004 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 10:57:32,005 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:57:32,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:32,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:32,275 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 10:57:32,276 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1641196489] [2020-07-21 10:57:32,276 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:57:32,276 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 10:57:32,277 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265154760] [2020-07-21 10:57:32,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 10:57:32,278 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:57:32,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 10:57:32,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 10:57:32,278 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-21 10:57:32,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:57:32,420 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 10:57:32,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 10:57:32,421 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-21 10:57:32,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:57:32,423 INFO L225 Difference]: With dead ends: 41 [2020-07-21 10:57:32,423 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 10:57:32,424 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 10:57:32,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 10:57:32,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 10:57:32,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 10:57:32,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 10:57:32,435 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 10:57:32,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:57:32,435 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 10:57:32,435 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 10:57:32,436 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 10:57:32,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 10:57:32,437 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:57:32,438 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 10:57:32,651 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:57:32,652 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:57:32,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:57:32,653 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 10:57:32,653 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:57:32,654 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [979855079] [2020-07-21 10:57:32,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:57:32,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:57:32,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 10:57:32,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:57:32,758 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 10:57:32,759 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:57:32,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:32,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:32,988 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 10:57:32,988 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [979855079] [2020-07-21 10:57:32,989 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:57:32,989 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 10:57:32,989 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212129734] [2020-07-21 10:57:32,990 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 10:57:32,991 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:57:32,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 10:57:32,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 10:57:32,993 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-21 10:57:33,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:57:33,128 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-21 10:57:33,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 10:57:33,129 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 10:57:33,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:57:33,135 INFO L225 Difference]: With dead ends: 46 [2020-07-21 10:57:33,135 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 10:57:33,138 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 10:57:33,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 10:57:33,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-21 10:57:33,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 10:57:33,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 10:57:33,156 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-21 10:57:33,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:57:33,156 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 10:57:33,157 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 10:57:33,157 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 10:57:33,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 10:57:33,162 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:57:33,162 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 10:57:33,363 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:57:33,364 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:57:33,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:57:33,365 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-21 10:57:33,366 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:57:33,367 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1495112986] [2020-07-21 10:57:33,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:57:33,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:57:33,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 10:57:33,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:57:33,457 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 10:57:33,457 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:57:33,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:33,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:33,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:33,827 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 10:57:33,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1495112986] [2020-07-21 10:57:33,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:57:33,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 10:57:33,828 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869253797] [2020-07-21 10:57:33,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 10:57:33,830 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:57:33,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 10:57:33,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 10:57:33,830 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-21 10:57:34,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:57:34,014 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-21 10:57:34,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 10:57:34,015 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-21 10:57:34,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:57:34,017 INFO L225 Difference]: With dead ends: 51 [2020-07-21 10:57:34,018 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 10:57:34,018 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 10:57:34,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 10:57:34,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-21 10:57:34,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 10:57:34,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 10:57:34,031 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-21 10:57:34,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:57:34,032 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 10:57:34,032 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 10:57:34,032 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 10:57:34,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 10:57:34,034 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:57:34,034 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 10:57:34,237 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:57:34,238 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:57:34,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:57:34,239 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-21 10:57:34,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:57:34,241 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [178648038] [2020-07-21 10:57:34,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:57:34,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:57:34,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 10:57:34,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:57:34,329 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 10:57:34,329 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:57:34,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:34,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:34,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:34,630 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 10:57:34,630 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [178648038] [2020-07-21 10:57:34,631 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:57:34,631 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 10:57:34,631 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239964730] [2020-07-21 10:57:34,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 10:57:34,632 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:57:34,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 10:57:34,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-21 10:57:34,633 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 11 states. [2020-07-21 10:57:34,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:57:34,804 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-21 10:57:34,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 10:57:34,806 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 40 [2020-07-21 10:57:34,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:57:34,813 INFO L225 Difference]: With dead ends: 56 [2020-07-21 10:57:34,813 INFO L226 Difference]: Without dead ends: 52 [2020-07-21 10:57:34,814 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 10:57:34,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-21 10:57:34,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-21 10:57:34,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 10:57:34,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 10:57:34,834 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-21 10:57:34,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:57:34,840 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 10:57:34,840 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 10:57:34,840 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 10:57:34,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-21 10:57:34,845 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:57:34,845 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 10:57:35,062 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:57:35,063 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:57:35,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:57:35,064 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-21 10:57:35,064 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:57:35,064 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [31400405] [2020-07-21 10:57:35,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:57:35,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:57:35,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 10:57:35,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:57:35,168 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 10:57:35,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:57:35,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:35,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:35,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:35,641 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:35,690 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 10:57:35,691 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [31400405] [2020-07-21 10:57:35,691 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:57:35,691 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 10:57:35,692 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061189124] [2020-07-21 10:57:35,692 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 10:57:35,692 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:57:35,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 10:57:35,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 10:57:35,693 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 13 states. [2020-07-21 10:57:35,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:57:35,880 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-21 10:57:35,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 10:57:35,880 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 52 [2020-07-21 10:57:35,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:57:35,884 INFO L225 Difference]: With dead ends: 61 [2020-07-21 10:57:35,884 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 10:57:35,885 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 10:57:35,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 10:57:35,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-21 10:57:35,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 10:57:35,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-21 10:57:35,906 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-21 10:57:35,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:57:35,907 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-21 10:57:35,908 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 10:57:35,909 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-21 10:57:35,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-21 10:57:35,913 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:57:35,913 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 10:57:36,118 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:57:36,118 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:57:36,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:57:36,119 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-21 10:57:36,120 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:57:36,120 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [900149896] [2020-07-21 10:57:36,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:57:36,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:57:36,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 10:57:36,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:57:36,225 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 10:57:36,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:57:36,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:36,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:36,489 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:36,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:36,557 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 10:57:36,557 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [900149896] [2020-07-21 10:57:36,557 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:57:36,558 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 10:57:36,558 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1674391873] [2020-07-21 10:57:36,559 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 10:57:36,559 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:57:36,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 10:57:36,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-21 10:57:36,562 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 11 states. [2020-07-21 10:57:36,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:57:36,735 INFO L93 Difference]: Finished difference Result 69 states and 116 transitions. [2020-07-21 10:57:36,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 10:57:36,737 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 54 [2020-07-21 10:57:36,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:57:36,740 INFO L225 Difference]: With dead ends: 69 [2020-07-21 10:57:36,740 INFO L226 Difference]: Without dead ends: 65 [2020-07-21 10:57:36,743 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 10:57:36,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-07-21 10:57:36,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 47. [2020-07-21 10:57:36,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-21 10:57:36,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 68 transitions. [2020-07-21 10:57:36,765 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 68 transitions. Word has length 54 [2020-07-21 10:57:36,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:57:36,766 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 68 transitions. [2020-07-21 10:57:36,766 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 10:57:36,766 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 68 transitions. [2020-07-21 10:57:36,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-21 10:57:36,771 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:57:36,771 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 10:57:36,986 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:57:36,987 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:57:36,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:57:36,988 INFO L82 PathProgramCache]: Analyzing trace with hash -242988780, now seen corresponding path program 1 times [2020-07-21 10:57:36,988 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:57:36,989 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1989837450] [2020-07-21 10:57:36,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:57:37,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:57:37,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 10:57:37,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:57:37,077 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 10:57:37,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:57:37,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:37,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:37,295 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 10:57:37,296 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1989837450] [2020-07-21 10:57:37,296 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:57:37,296 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-21 10:57:37,296 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [770185588] [2020-07-21 10:57:37,297 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 10:57:37,297 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:57:37,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 10:57:37,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-21 10:57:37,298 INFO L87 Difference]: Start difference. First operand 47 states and 68 transitions. Second operand 9 states. [2020-07-21 10:57:37,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:57:37,424 INFO L93 Difference]: Finished difference Result 61 states and 93 transitions. [2020-07-21 10:57:37,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 10:57:37,425 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 55 [2020-07-21 10:57:37,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:57:37,426 INFO L225 Difference]: With dead ends: 61 [2020-07-21 10:57:37,427 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 10:57:37,427 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 98 SyntacticMatches, 5 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2020-07-21 10:57:37,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 10:57:37,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 49. [2020-07-21 10:57:37,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-07-21 10:57:37,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 73 transitions. [2020-07-21 10:57:37,439 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 73 transitions. Word has length 55 [2020-07-21 10:57:37,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:57:37,439 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 73 transitions. [2020-07-21 10:57:37,440 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 10:57:37,440 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 73 transitions. [2020-07-21 10:57:37,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 10:57:37,441 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:57:37,442 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 10:57:37,657 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:57:37,658 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:57:37,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:57:37,659 INFO L82 PathProgramCache]: Analyzing trace with hash 643857677, now seen corresponding path program 1 times [2020-07-21 10:57:37,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:57:37,660 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1014359244] [2020-07-21 10:57:37,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:57:37,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:57:37,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 10:57:37,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:57:37,803 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 10:57:37,803 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:57:38,019 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:38,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:38,128 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:38,156 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 10:57:38,157 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1014359244] [2020-07-21 10:57:38,157 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:57:38,157 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 10:57:38,157 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1659870907] [2020-07-21 10:57:38,158 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 10:57:38,158 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:57:38,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 10:57:38,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-21 10:57:38,159 INFO L87 Difference]: Start difference. First operand 49 states and 73 transitions. Second operand 11 states. [2020-07-21 10:57:38,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:57:38,304 INFO L93 Difference]: Finished difference Result 66 states and 108 transitions. [2020-07-21 10:57:38,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 10:57:38,305 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 67 [2020-07-21 10:57:38,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:57:38,309 INFO L225 Difference]: With dead ends: 66 [2020-07-21 10:57:38,309 INFO L226 Difference]: Without dead ends: 62 [2020-07-21 10:57:38,310 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 10:57:38,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-21 10:57:38,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 52. [2020-07-21 10:57:38,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-07-21 10:57:38,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 80 transitions. [2020-07-21 10:57:38,320 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 80 transitions. Word has length 67 [2020-07-21 10:57:38,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:57:38,320 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 80 transitions. [2020-07-21 10:57:38,320 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 10:57:38,321 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 80 transitions. [2020-07-21 10:57:38,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 10:57:38,322 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:57:38,322 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 10:57:38,526 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:57:38,527 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:57:38,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:57:38,528 INFO L82 PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 2 times [2020-07-21 10:57:38,529 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:57:38,529 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1663284402] [2020-07-21 10:57:38,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:57:38,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 10:57:38,576 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 10:57:38,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 10:57:38,592 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 10:57:38,616 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 10:57:38,616 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 10:57:38,832 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:57:38,866 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 10:57:38 BoogieIcfgContainer [2020-07-21 10:57:38,866 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 10:57:38,869 INFO L168 Benchmark]: Toolchain (without parser) took 8962.51 ms. Allocated memory was 137.9 MB in the beginning and 282.1 MB in the end (delta: 144.2 MB). Free memory was 101.8 MB in the beginning and 134.7 MB in the end (delta: -32.9 MB). Peak memory consumption was 111.3 MB. Max. memory is 7.1 GB. [2020-07-21 10:57:38,870 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 137.9 MB. Free memory was 119.7 MB in the beginning and 119.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 10:57:38,874 INFO L168 Benchmark]: CACSL2BoogieTranslator took 297.20 ms. Allocated memory is still 137.9 MB. Free memory was 101.3 MB in the beginning and 91.8 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-07-21 10:57:38,875 INFO L168 Benchmark]: Boogie Preprocessor took 158.42 ms. Allocated memory was 137.9 MB in the beginning and 202.4 MB in the end (delta: 64.5 MB). Free memory was 91.8 MB in the beginning and 181.2 MB in the end (delta: -89.4 MB). Peak memory consumption was 14.3 MB. Max. memory is 7.1 GB. [2020-07-21 10:57:38,876 INFO L168 Benchmark]: RCFGBuilder took 289.81 ms. Allocated memory is still 202.4 MB. Free memory was 181.2 MB in the beginning and 167.9 MB in the end (delta: 13.3 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. [2020-07-21 10:57:38,877 INFO L168 Benchmark]: TraceAbstraction took 8209.85 ms. Allocated memory was 202.4 MB in the beginning and 282.1 MB in the end (delta: 79.7 MB). Free memory was 167.2 MB in the beginning and 134.7 MB in the end (delta: 32.5 MB). Peak memory consumption was 112.2 MB. Max. memory is 7.1 GB. [2020-07-21 10:57:38,885 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 137.9 MB. Free memory was 119.7 MB in the beginning and 119.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 297.20 ms. Allocated memory is still 137.9 MB. Free memory was 101.3 MB in the beginning and 91.8 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 158.42 ms. Allocated memory was 137.9 MB in the beginning and 202.4 MB in the end (delta: 64.5 MB). Free memory was 91.8 MB in the beginning and 181.2 MB in the end (delta: -89.4 MB). Peak memory consumption was 14.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 289.81 ms. Allocated memory is still 202.4 MB. Free memory was 181.2 MB in the beginning and 167.9 MB in the end (delta: 13.3 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 8209.85 ms. Allocated memory was 202.4 MB in the beginning and 282.1 MB in the end (delta: 79.7 MB). Free memory was 167.2 MB in the beginning and 134.7 MB in the end (delta: 32.5 MB). Peak memory consumption was 112.2 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: 8.0s, OverallIterations: 11, TraceHistogramMax: 5, AutomataDifference: 1.6s, 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, 1.2s 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, 3.2s InterpolantComputationTime, 455 NumberOfCodeBlocks, 455 NumberOfCodeBlocksAsserted, 11 NumberOfCheckSat, 729 ConstructedInterpolants, 0 QuantifiedInterpolants, 72411 SizeOfPredicates, 34 NumberOfNonLiveVariables, 881 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...