/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/Fibonacci04.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 22:02:52,868 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 22:02:52,872 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 22:02:52,890 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 22:02:52,891 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 22:02:52,893 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 22:02:52,895 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 22:02:52,905 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 22:02:52,911 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 22:02:52,913 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 22:02:52,915 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 22:02:52,918 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 22:02:52,918 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 22:02:52,920 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 22:02:52,922 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 22:02:52,924 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 22:02:52,926 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 22:02:52,926 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 22:02:52,928 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 22:02:52,933 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 22:02:52,939 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 22:02:52,943 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 22:02:52,944 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 22:02:52,944 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 22:02:52,948 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 22:02:52,960 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 22:02:52,961 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 22:02:52,962 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 22:02:52,963 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 22:02:52,985 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 22:02:52,985 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 22:02:52,987 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 22:02:52,987 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 22:02:52,987 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 22:02:52,987 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 22:02:52,987 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 22:02:52,988 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 22:02:52,988 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 22:02:52,988 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 22:02:52,989 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 22:02:52,989 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 22:02:52,990 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 22:02:52,990 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 22:02:52,990 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 22:02:52,991 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 22:02:52,991 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 22:02:52,991 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 22:02:52,991 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 22:02:52,991 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 22:02:52,991 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 22:02:52,992 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:02:52,992 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 22:02:52,992 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 22:02:52,992 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 22:02:52,993 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 22:02:52,993 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:52,993 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 22:02:52,993 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 22:02:52,993 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 22:02:53,307 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 22:02:53,325 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 22:02:53,329 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 22:02:53,330 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 22:02:53,331 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 22:02:53,331 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Fibonacci04.c [2020-07-21 22:02:53,402 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f484285fb/296a8088185745d4b11505923bb3086a/FLAG76334eb03 [2020-07-21 22:02:53,826 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 22:02:53,827 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Fibonacci04.c [2020-07-21 22:02:53,835 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f484285fb/296a8088185745d4b11505923bb3086a/FLAG76334eb03 [2020-07-21 22:02:54,217 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f484285fb/296a8088185745d4b11505923bb3086a [2020-07-21 22:02:54,226 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 22:02:54,229 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 22:02:54,230 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 22:02:54,230 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 22:02:54,233 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 22:02:54,234 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:02:54" (1/1) ... [2020-07-21 22:02:54,237 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@a0b6dd8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:54, skipping insertion in model container [2020-07-21 22:02:54,237 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:02:54" (1/1) ... [2020-07-21 22:02:54,244 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 22:02:54,259 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 22:02:54,425 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:02:54,429 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 22:02:54,446 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:02:54,460 INFO L208 MainTranslator]: Completed translation [2020-07-21 22:02:54,460 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:54 WrapperNode [2020-07-21 22:02:54,461 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 22:02:54,461 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 22:02:54,461 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 22:02:54,462 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 22:02:54,475 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:54" (1/1) ... [2020-07-21 22:02:54,475 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:54" (1/1) ... [2020-07-21 22:02:54,480 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:54" (1/1) ... [2020-07-21 22:02:54,481 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:54" (1/1) ... [2020-07-21 22:02:54,484 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:54" (1/1) ... [2020-07-21 22:02:54,486 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:54" (1/1) ... [2020-07-21 22:02:54,487 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:54" (1/1) ... [2020-07-21 22:02:54,488 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 22:02:54,489 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 22:02:54,489 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 22:02:54,489 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 22:02:54,490 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:54" (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 22:02:54,634 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 22:02:54,635 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 22:02:54,635 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2020-07-21 22:02:54,635 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 22:02:54,635 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 22:02:54,636 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 22:02:54,636 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2020-07-21 22:02:54,636 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 22:02:54,636 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 22:02:54,636 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 22:02:54,801 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 22:02:54,801 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 22:02:54,805 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:02:54 BoogieIcfgContainer [2020-07-21 22:02:54,805 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 22:02:54,806 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 22:02:54,807 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 22:02:54,810 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 22:02:54,810 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:02:54" (1/3) ... [2020-07-21 22:02:54,811 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9f36423 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:02:54, skipping insertion in model container [2020-07-21 22:02:54,811 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:54" (2/3) ... [2020-07-21 22:02:54,812 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9f36423 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:02:54, skipping insertion in model container [2020-07-21 22:02:54,812 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:02:54" (3/3) ... [2020-07-21 22:02:54,813 INFO L109 eAbstractionObserver]: Analyzing ICFG Fibonacci04.c [2020-07-21 22:02:54,824 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 22:02:54,831 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 22:02:54,845 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 22:02:54,873 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 22:02:54,873 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 22:02:54,874 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 22:02:54,874 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 22:02:54,874 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 22:02:54,875 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 22:02:54,875 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 22:02:54,875 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 22:02:54,896 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-07-21 22:02:54,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 22:02:54,905 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:54,906 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:54,906 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:54,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:54,914 INFO L82 PathProgramCache]: Analyzing trace with hash -1356498376, now seen corresponding path program 1 times [2020-07-21 22:02:54,927 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:54,928 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [889233339] [2020-07-21 22:02:54,928 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 22:02:55,009 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:02:55,010 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:55,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:02:55,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:55,108 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 22:02:55,108 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:02:55,109 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [889233339] [2020-07-21 22:02:55,110 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:02:55,110 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:02:55,111 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697133306] [2020-07-21 22:02:55,116 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:02:55,116 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:02:55,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:02:55,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:02:55,132 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 5 states. [2020-07-21 22:02:55,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:02:55,232 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 22:02:55,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:02:55,234 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 22:02:55,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:02:55,245 INFO L225 Difference]: With dead ends: 35 [2020-07-21 22:02:55,245 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 22:02:55,249 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 22:02:55,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 22:02:55,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 22:02:55,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 22:02:55,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 22:02:55,296 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 22:02:55,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:02:55,297 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 22:02:55,297 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:02:55,297 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 22:02:55,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 22:02:55,299 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:55,299 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:55,513 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:55,513 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:55,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:55,514 INFO L82 PathProgramCache]: Analyzing trace with hash 1591396412, now seen corresponding path program 1 times [2020-07-21 22:02:55,515 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:55,516 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1549847571] [2020-07-21 22:02:55,516 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 22:02:55,545 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:02:55,546 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:55,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:02:55,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:55,588 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 22:02:55,588 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:02:55,589 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1549847571] [2020-07-21 22:02:55,589 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:02:55,589 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:02:55,590 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730728210] [2020-07-21 22:02:55,591 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:02:55,592 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:02:55,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:02:55,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:02:55,593 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 22:02:55,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:02:55,677 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 22:02:55,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:02:55,678 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 22:02:55,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:02:55,680 INFO L225 Difference]: With dead ends: 27 [2020-07-21 22:02:55,680 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 22:02:55,681 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 22:02:55,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 22:02:55,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 22:02:55,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 22:02:55,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 22:02:55,689 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 22:02:55,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:02:55,690 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 22:02:55,690 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:02:55,690 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 22:02:55,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 22:02:55,692 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:55,692 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:55,905 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:55,906 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:55,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:55,908 INFO L82 PathProgramCache]: Analyzing trace with hash -1761048597, now seen corresponding path program 1 times [2020-07-21 22:02:55,909 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:55,910 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1885818055] [2020-07-21 22:02:55,910 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 22:02:55,941 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:02:55,942 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:55,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 22:02:55,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:55,991 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 22:02:55,991 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:02:55,991 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1885818055] [2020-07-21 22:02:55,992 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:02:55,992 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 22:02:55,992 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1563806126] [2020-07-21 22:02:55,993 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 22:02:55,993 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:02:55,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 22:02:55,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-07-21 22:02:55,994 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 6 states. [2020-07-21 22:02:56,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:02:56,084 INFO L93 Difference]: Finished difference Result 38 states and 49 transitions. [2020-07-21 22:02:56,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 22:02:56,085 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 26 [2020-07-21 22:02:56,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:02:56,086 INFO L225 Difference]: With dead ends: 38 [2020-07-21 22:02:56,086 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 22:02:56,087 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2020-07-21 22:02:56,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 22:02:56,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-21 22:02:56,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-21 22:02:56,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2020-07-21 22:02:56,095 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 26 [2020-07-21 22:02:56,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:02:56,096 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2020-07-21 22:02:56,096 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 22:02:56,096 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2020-07-21 22:02:56,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 22:02:56,098 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:56,098 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:56,313 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:56,313 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:56,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:56,314 INFO L82 PathProgramCache]: Analyzing trace with hash -624449707, now seen corresponding path program 1 times [2020-07-21 22:02:56,315 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:56,315 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [287316716] [2020-07-21 22:02:56,316 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 22:02:56,348 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:02:56,348 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:56,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 22:02:56,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:56,405 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 22:02:56,407 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:02:56,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:56,604 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:56,635 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 22:02:56,636 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [287316716] [2020-07-21 22:02:56,636 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:02:56,636 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 10 [2020-07-21 22:02:56,637 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1866881957] [2020-07-21 22:02:56,637 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 22:02:56,638 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:02:56,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 22:02:56,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-07-21 22:02:56,638 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 10 states. [2020-07-21 22:02:56,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:02:56,764 INFO L93 Difference]: Finished difference Result 39 states and 56 transitions. [2020-07-21 22:02:56,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:02:56,765 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 22:02:56,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:02:56,767 INFO L225 Difference]: With dead ends: 39 [2020-07-21 22:02:56,768 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 22:02:56,768 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 45 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:02:56,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 22:02:56,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-21 22:02:56,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 22:02:56,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 49 transitions. [2020-07-21 22:02:56,780 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 49 transitions. Word has length 27 [2020-07-21 22:02:56,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:02:56,780 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 49 transitions. [2020-07-21 22:02:56,780 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 22:02:56,780 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 49 transitions. [2020-07-21 22:02:56,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-07-21 22:02:56,784 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:56,784 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 8, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:56,997 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:56,998 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:56,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:56,998 INFO L82 PathProgramCache]: Analyzing trace with hash 1317930072, now seen corresponding path program 2 times [2020-07-21 22:02:56,998 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:56,999 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1845951646] [2020-07-21 22:02:56,999 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 22:02:57,047 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:02:57,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:57,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:02:57,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:57,134 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 221 proven. 13 refuted. 0 times theorem prover too weak. 166 trivial. 0 not checked. [2020-07-21 22:02:57,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:02:57,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:57,692 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 58 proven. 126 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2020-07-21 22:02:57,692 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1845951646] [2020-07-21 22:02:57,693 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:02:57,693 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 22:02:57,693 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205411442] [2020-07-21 22:02:57,694 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 22:02:57,694 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:02:57,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 22:02:57,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:02:57,695 INFO L87 Difference]: Start difference. First operand 33 states and 49 transitions. Second operand 11 states. [2020-07-21 22:02:57,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:02:57,854 INFO L93 Difference]: Finished difference Result 65 states and 113 transitions. [2020-07-21 22:02:57,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:02:57,856 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 93 [2020-07-21 22:02:57,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:02:57,858 INFO L225 Difference]: With dead ends: 65 [2020-07-21 22:02:57,858 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 22:02:57,859 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 169 SyntacticMatches, 7 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=77, Invalid=163, Unknown=0, NotChecked=0, Total=240 [2020-07-21 22:02:57,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 22:02:57,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 35. [2020-07-21 22:02:57,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 22:02:57,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 49 transitions. [2020-07-21 22:02:57,869 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 49 transitions. Word has length 93 [2020-07-21 22:02:57,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:02:57,870 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 49 transitions. [2020-07-21 22:02:57,870 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 22:02:57,870 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 49 transitions. [2020-07-21 22:02:57,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-07-21 22:02:57,872 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:57,872 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 9, 5, 5, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:58,078 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:58,080 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:58,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:58,081 INFO L82 PathProgramCache]: Analyzing trace with hash -1541039141, now seen corresponding path program 3 times [2020-07-21 22:02:58,081 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:58,082 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1943112462] [2020-07-21 22:02:58,083 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 22:02:58,135 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:02:58,136 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:58,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 22:02:58,143 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:58,239 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 82 proven. 122 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2020-07-21 22:02:58,239 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:02:58,721 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:58,721 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:58,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:58,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:59,024 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:59,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:59,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:59,130 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 82 proven. 134 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2020-07-21 22:02:59,130 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1943112462] [2020-07-21 22:02:59,131 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:02:59,131 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 22:02:59,131 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053589138] [2020-07-21 22:02:59,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 22:02:59,132 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:02:59,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 22:02:59,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:02:59,134 INFO L87 Difference]: Start difference. First operand 35 states and 49 transitions. Second operand 17 states. [2020-07-21 22:02:59,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:02:59,573 INFO L93 Difference]: Finished difference Result 78 states and 125 transitions. [2020-07-21 22:02:59,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 22:02:59,573 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 82 [2020-07-21 22:02:59,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:02:59,575 INFO L225 Difference]: With dead ends: 78 [2020-07-21 22:02:59,575 INFO L226 Difference]: Without dead ends: 49 [2020-07-21 22:02:59,580 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 139 SyntacticMatches, 13 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=237, Invalid=575, Unknown=0, NotChecked=0, Total=812 [2020-07-21 22:02:59,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-21 22:02:59,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-07-21 22:02:59,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-07-21 22:02:59,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 62 transitions. [2020-07-21 22:02:59,597 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 62 transitions. Word has length 82 [2020-07-21 22:02:59,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:02:59,599 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 62 transitions. [2020-07-21 22:02:59,599 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 22:02:59,599 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 62 transitions. [2020-07-21 22:02:59,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2020-07-21 22:02:59,604 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:59,604 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 17, 10, 10, 10, 10, 10, 10, 10, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:59,804 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:59,805 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:59,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:59,806 INFO L82 PathProgramCache]: Analyzing trace with hash 1110256604, now seen corresponding path program 4 times [2020-07-21 22:02:59,806 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:59,807 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1735095614] [2020-07-21 22:02:59,807 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 22:02:59,870 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:02:59,871 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:59,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 22:02:59,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:03:00,037 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 249 proven. 418 refuted. 0 times theorem prover too weak. 489 trivial. 0 not checked. [2020-07-21 22:03:00,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:03:00,807 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:00,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:00,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:00,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:01,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:01,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:01,501 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:01,547 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 249 proven. 445 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2020-07-21 22:03:01,548 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1735095614] [2020-07-21 22:03:01,548 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:03:01,548 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 22:03:01,549 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369101747] [2020-07-21 22:03:01,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 22:03:01,550 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:03:01,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 22:03:01,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 22:03:01,550 INFO L87 Difference]: Start difference. First operand 49 states and 62 transitions. Second operand 21 states. [2020-07-21 22:03:02,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:03:02,063 INFO L93 Difference]: Finished difference Result 109 states and 162 transitions. [2020-07-21 22:03:02,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 22:03:02,064 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 150 [2020-07-21 22:03:02,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:03:02,068 INFO L225 Difference]: With dead ends: 109 [2020-07-21 22:03:02,068 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 22:03:02,070 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 315 GetRequests, 263 SyntacticMatches, 17 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=363, Invalid=969, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 22:03:02,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 22:03:02,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 61. [2020-07-21 22:03:02,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 22:03:02,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 76 transitions. [2020-07-21 22:03:02,081 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 76 transitions. Word has length 150 [2020-07-21 22:03:02,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:03:02,082 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 76 transitions. [2020-07-21 22:03:02,082 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 22:03:02,082 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 76 transitions. [2020-07-21 22:03:02,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 22:03:02,084 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:03:02,085 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:03:02,298 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:03:02,299 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:03:02,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:03:02,300 INFO L82 PathProgramCache]: Analyzing trace with hash 580129251, now seen corresponding path program 5 times [2020-07-21 22:03:02,300 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:03:02,301 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [55174643] [2020-07-21 22:03:02,301 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 22:03:02,386 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:03:02,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 22:03:02,386 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 22:03:02,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 22:03:02,410 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 22:03:02,440 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 22:03:02,441 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 22:03:02,655 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:03:02,693 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 10:03:02 BoogieIcfgContainer [2020-07-21 22:03:02,693 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 22:03:02,696 INFO L168 Benchmark]: Toolchain (without parser) took 8467.18 ms. Allocated memory was 140.5 MB in the beginning and 287.8 MB in the end (delta: 147.3 MB). Free memory was 105.5 MB in the beginning and 204.2 MB in the end (delta: -98.6 MB). Peak memory consumption was 48.7 MB. Max. memory is 7.1 GB. [2020-07-21 22:03:02,696 INFO L168 Benchmark]: CDTParser took 0.47 ms. Allocated memory is still 140.5 MB. Free memory is still 123.2 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-21 22:03:02,697 INFO L168 Benchmark]: CACSL2BoogieTranslator took 231.17 ms. Allocated memory is still 140.5 MB. Free memory was 105.1 MB in the beginning and 95.7 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-07-21 22:03:02,698 INFO L168 Benchmark]: Boogie Preprocessor took 26.98 ms. Allocated memory is still 140.5 MB. Free memory was 95.7 MB in the beginning and 94.4 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-21 22:03:02,699 INFO L168 Benchmark]: RCFGBuilder took 316.66 ms. Allocated memory was 140.5 MB in the beginning and 204.5 MB in the end (delta: 64.0 MB). Free memory was 94.0 MB in the beginning and 171.9 MB in the end (delta: -78.0 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. [2020-07-21 22:03:02,700 INFO L168 Benchmark]: TraceAbstraction took 7886.89 ms. Allocated memory was 204.5 MB in the beginning and 287.8 MB in the end (delta: 83.4 MB). Free memory was 171.9 MB in the beginning and 204.2 MB in the end (delta: -32.3 MB). Peak memory consumption was 51.1 MB. Max. memory is 7.1 GB. [2020-07-21 22:03:02,703 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.47 ms. Allocated memory is still 140.5 MB. Free memory is still 123.2 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 231.17 ms. Allocated memory is still 140.5 MB. Free memory was 105.1 MB in the beginning and 95.7 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 26.98 ms. Allocated memory is still 140.5 MB. Free memory was 95.7 MB in the beginning and 94.4 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 316.66 ms. Allocated memory was 140.5 MB in the beginning and 204.5 MB in the end (delta: 64.0 MB). Free memory was 94.0 MB in the beginning and 171.9 MB in the end (delta: -78.0 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 7886.89 ms. Allocated memory was 204.5 MB in the beginning and 287.8 MB in the end (delta: 83.4 MB). Free memory was 171.9 MB in the beginning and 204.2 MB in the end (delta: -32.3 MB). Peak memory consumption was 51.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 33]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L28] int x = __VERIFIER_nondet_int(); [L29] CALL, EXPR fibonacci(x) VAL [\old(n)=5] [L17] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L19] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=4] [L17] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L19] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=3] [L17] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L19] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=2] [L17] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L19] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L17] COND TRUE n < 1 [L18] return 0; VAL [\old(n)=0, \result=0, n=0] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=3, fibonacci(n-1)=1, n=3] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=3, fibonacci(n-1)=1, fibonacci(n-2)=1, n=3] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=4, fibonacci(n-1)=2, n=4] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=2] [L17] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L19] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L17] COND TRUE n < 1 [L18] return 0; VAL [\old(n)=0, \result=0, n=0] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=4, fibonacci(n-1)=2, fibonacci(n-2)=1, n=4] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=5, fibonacci(n-1)=3, n=5] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=3] [L17] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L19] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=2] [L17] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L19] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L17] COND TRUE n < 1 [L18] return 0; VAL [\old(n)=0, \result=0, n=0] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=3, fibonacci(n-1)=1, n=3] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=3, fibonacci(n-1)=1, fibonacci(n-2)=1, n=3] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=5, fibonacci(n-1)=3, fibonacci(n-2)=2, n=5] [L22] return fibonacci(n-1) + fibonacci(n-2); [L29] RET, EXPR fibonacci(x) VAL [fibonacci(x)=5, x=5] [L29] int result = fibonacci(x); [L30] COND FALSE !(x != 5 || result == 3) VAL [result=5, x=5] [L33] __VERIFIER_error() VAL [result=5, x=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 23 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 7.7s, OverallIterations: 8, TraceHistogramMax: 21, AutomataDifference: 1.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 134 SDtfs, 339 SDslu, 407 SDs, 0 SdLazy, 536 SolverSat, 321 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 798 GetRequests, 656 SyntacticMatches, 40 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 399 ImplicationChecksByTransitivity, 1.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=61occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 7 MinimizatonAttempts, 12 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 3.7s InterpolantComputationTime, 514 NumberOfCodeBlocks, 401 NumberOfCodeBlocksAsserted, 25 NumberOfCheckSat, 746 ConstructedInterpolants, 0 QuantifiedInterpolants, 155401 SizeOfPredicates, 33 NumberOfNonLiveVariables, 676 ConjunctsInSsa, 59 ConjunctsInUnsatCore, 11 InterpolantComputations, 3 PerfectInterpolantSequences, 2470/3742 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...