/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:00:23,823 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:00:23,828 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:00:23,852 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:00:23,853 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:00:23,854 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:00:23,857 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:00:23,859 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:00:23,862 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:00:23,863 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:00:23,864 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:00:23,866 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:00:23,867 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:00:23,868 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:00:23,870 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:00:23,871 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:00:23,873 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:00:23,875 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:00:23,877 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:00:23,880 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:00:23,883 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:00:23,884 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:00:23,886 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:00:23,887 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:00:23,890 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:00:23,902 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:00:23,904 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:00:23,905 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:00:23,906 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 16:00:23,925 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:00:23,926 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:00:23,927 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:00:23,928 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:00:23,928 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:00:23,928 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:00:23,929 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:00:23,929 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:00:23,929 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:00:23,929 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:00:23,930 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:00:23,930 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:00:23,930 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:00:23,930 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:00:23,930 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:00:23,931 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:00:23,931 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:00:23,931 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:00:23,931 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:00:23,931 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:00:23,932 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:00:23,932 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:00:23,932 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:00:23,932 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:00:23,932 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:00:23,933 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:00:23,933 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:23,933 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:00:23,933 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:00:23,933 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 16:00:24,285 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:00:24,305 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:00:24,310 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:00:24,312 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:00:24,313 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:00:24,314 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c [2020-07-21 16:00:24,410 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dde624340/856d983eb2ac4ec2b1cd38d79786e05f/FLAG8906deb33 [2020-07-21 16:00:25,084 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:00:25,085 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c [2020-07-21 16:00:25,096 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dde624340/856d983eb2ac4ec2b1cd38d79786e05f/FLAG8906deb33 [2020-07-21 16:00:25,372 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dde624340/856d983eb2ac4ec2b1cd38d79786e05f [2020-07-21 16:00:25,384 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:00:25,388 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:00:25,389 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:00:25,390 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:00:25,395 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:00:25,397 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:00:25" (1/1) ... [2020-07-21 16:00:25,401 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5b23d114 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:25, skipping insertion in model container [2020-07-21 16:00:25,402 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:00:25" (1/1) ... [2020-07-21 16:00:25,412 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:00:25,438 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:00:25,710 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:00:25,718 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:00:25,742 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:00:25,763 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:00:25,764 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:25 WrapperNode [2020-07-21 16:00:25,765 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:00:25,766 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:00:25,766 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:00:25,767 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:00:25,787 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:25" (1/1) ... [2020-07-21 16:00:25,788 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:25" (1/1) ... [2020-07-21 16:00:25,795 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:25" (1/1) ... [2020-07-21 16:00:25,796 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:25" (1/1) ... [2020-07-21 16:00:25,803 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:25" (1/1) ... [2020-07-21 16:00:25,807 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:25" (1/1) ... [2020-07-21 16:00:25,809 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:25" (1/1) ... [2020-07-21 16:00:25,811 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:00:25,812 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:00:25,813 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:00:25,813 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:00:25,815 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:25" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:00:26,022 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:00:26,022 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:00:26,022 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 16:00:26,023 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 16:00:26,023 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:00:26,023 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 16:00:26,023 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:00:26,023 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 16:00:26,024 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 16:00:26,024 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:00:26,024 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:00:26,024 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:00:26,347 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:00:26,348 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 16:00:26,365 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:00:26 BoogieIcfgContainer [2020-07-21 16:00:26,365 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:00:26,368 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:00:26,368 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:00:26,379 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:00:26,380 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:00:25" (1/3) ... [2020-07-21 16:00:26,381 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c39fc1b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:00:26, skipping insertion in model container [2020-07-21 16:00:26,382 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:25" (2/3) ... [2020-07-21 16:00:26,382 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c39fc1b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:00:26, skipping insertion in model container [2020-07-21 16:00:26,384 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:00:26" (3/3) ... [2020-07-21 16:00:26,387 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_4-2.c [2020-07-21 16:00:26,414 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:00:26,430 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:00:26,468 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:00:26,504 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:00:26,504 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:00:26,505 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:00:26,505 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:00:26,505 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:00:26,505 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:00:26,505 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:00:26,505 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:00:26,524 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 16:00:26,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 16:00:26,530 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:26,531 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:26,532 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:26,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:26,537 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 16:00:26,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:26,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1698965299] [2020-07-21 16:00:26,545 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:26,621 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:26,621 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:26,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 16:00:26,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:26,734 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:00:26,734 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:00:26,735 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1698965299] [2020-07-21 16:00:26,736 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:00:26,736 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:00:26,737 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268072776] [2020-07-21 16:00:26,743 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:00:26,744 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:26,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:00:26,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:00:26,757 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 16:00:26,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:26,873 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 16:00:26,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:00:26,876 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 16:00:26,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:26,893 INFO L225 Difference]: With dead ends: 44 [2020-07-21 16:00:26,894 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 16:00:26,900 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 16:00:26,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 16:00:26,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 16:00:26,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 16:00:26,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 16:00:26,952 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 16:00:26,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:26,953 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 16:00:26,953 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:00:26,953 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 16:00:26,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 16:00:26,956 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:26,956 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:27,172 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:27,173 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:27,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:27,174 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 16:00:27,175 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:27,175 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2097024255] [2020-07-21 16:00:27,176 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:27,219 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:27,219 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:27,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 16:00:27,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:27,261 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:00:27,262 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:00:27,262 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2097024255] [2020-07-21 16:00:27,262 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:00:27,263 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:00:27,263 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292711900] [2020-07-21 16:00:27,265 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:00:27,265 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:27,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:00:27,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:00:27,267 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 16:00:27,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:27,349 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 16:00:27,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:00:27,350 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 16:00:27,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:27,353 INFO L225 Difference]: With dead ends: 36 [2020-07-21 16:00:27,353 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 16:00:27,355 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 16:00:27,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 16:00:27,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 16:00:27,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 16:00:27,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 16:00:27,369 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 16:00:27,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:27,369 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 16:00:27,369 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:00:27,370 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 16:00:27,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 16:00:27,372 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:27,373 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 16:00:27,586 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:27,587 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:27,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:27,589 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 16:00:27,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:27,590 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1132993740] [2020-07-21 16:00:27,591 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:27,631 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:27,632 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:27,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:00:27,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:27,710 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 16:00:27,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:27,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:27,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:28,000 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 16:00:28,001 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1132993740] [2020-07-21 16:00:28,002 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:28,002 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 16:00:28,003 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882970473] [2020-07-21 16:00:28,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 16:00:28,004 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:28,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 16:00:28,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:00:28,005 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-21 16:00:28,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:28,230 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 16:00:28,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:00:28,231 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-21 16:00:28,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:28,234 INFO L225 Difference]: With dead ends: 41 [2020-07-21 16:00:28,234 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 16:00:28,235 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 16:00:28,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 16:00:28,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 16:00:28,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 16:00:28,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 16:00:28,248 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 16:00:28,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:28,249 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 16:00:28,249 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 16:00:28,250 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 16:00:28,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 16:00:28,252 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:28,252 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 16:00:28,466 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:28,468 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:28,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:28,469 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 16:00:28,469 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:28,470 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1571715459] [2020-07-21 16:00:28,470 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:28,507 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:28,508 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:28,509 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:00:28,514 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:28,593 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 16:00:28,594 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:28,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:28,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:28,895 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 16:00:28,896 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1571715459] [2020-07-21 16:00:28,897 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:28,897 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 16:00:28,897 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136356350] [2020-07-21 16:00:28,898 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 16:00:28,898 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:28,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 16:00:28,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:00:28,900 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-21 16:00:29,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:29,109 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-21 16:00:29,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:00:29,111 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 16:00:29,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:29,119 INFO L225 Difference]: With dead ends: 46 [2020-07-21 16:00:29,120 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 16:00:29,123 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 16:00:29,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 16:00:29,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-21 16:00:29,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 16:00:29,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 16:00:29,156 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-21 16:00:29,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:29,162 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 16:00:29,163 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 16:00:29,163 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 16:00:29,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 16:00:29,166 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:29,167 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 16:00:29,370 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:29,371 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:29,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:29,372 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-21 16:00:29,373 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:29,373 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [490579684] [2020-07-21 16:00:29,374 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:29,423 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:29,423 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:29,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:29,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:29,524 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 16:00:29,524 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:29,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:29,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:29,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:29,971 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 16:00:29,971 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [490579684] [2020-07-21 16:00:29,972 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:29,972 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 16:00:29,972 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369243762] [2020-07-21 16:00:29,973 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:29,974 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:29,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:29,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:29,975 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-21 16:00:30,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:30,222 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-21 16:00:30,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:30,223 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-21 16:00:30,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:30,228 INFO L225 Difference]: With dead ends: 51 [2020-07-21 16:00:30,229 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 16:00:30,233 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:00:30,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 16:00:30,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-21 16:00:30,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 16:00:30,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 16:00:30,256 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-21 16:00:30,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:30,256 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 16:00:30,256 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:30,257 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 16:00:30,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 16:00:30,259 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:30,259 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 16:00:30,461 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:30,462 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:30,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:30,463 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-21 16:00:30,464 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:30,465 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [872690908] [2020-07-21 16:00:30,466 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:30,502 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:30,502 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:30,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:30,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:30,591 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 16:00:30,591 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:30,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:30,926 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:30,969 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 16:00:30,970 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [872690908] [2020-07-21 16:00:30,970 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:30,971 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-21 16:00:30,971 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [696243071] [2020-07-21 16:00:30,972 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:30,972 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:30,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:30,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:30,973 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-21 16:00:31,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:31,363 INFO L93 Difference]: Finished difference Result 84 states and 136 transitions. [2020-07-21 16:00:31,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:31,364 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-21 16:00:31,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:31,372 INFO L225 Difference]: With dead ends: 84 [2020-07-21 16:00:31,373 INFO L226 Difference]: Without dead ends: 50 [2020-07-21 16:00:31,379 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 64 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:00:31,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-21 16:00:31,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2020-07-21 16:00:31,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-21 16:00:31,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 67 transitions. [2020-07-21 16:00:31,415 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 67 transitions. Word has length 40 [2020-07-21 16:00:31,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:31,417 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 67 transitions. [2020-07-21 16:00:31,417 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:31,418 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 67 transitions. [2020-07-21 16:00:31,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 16:00:31,424 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:31,429 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 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 16:00:31,643 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:31,644 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:31,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:31,645 INFO L82 PathProgramCache]: Analyzing trace with hash 208191613, now seen corresponding path program 1 times [2020-07-21 16:00:31,645 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:31,645 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1701035224] [2020-07-21 16:00:31,646 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:00:31,684 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:31,684 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:31,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:31,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:31,766 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 16:00:31,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:31,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:32,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:32,087 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 16:00:32,087 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1701035224] [2020-07-21 16:00:32,088 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:32,088 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 16:00:32,088 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613677613] [2020-07-21 16:00:32,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 16:00:32,089 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:32,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 16:00:32,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-21 16:00:32,090 INFO L87 Difference]: Start difference. First operand 47 states and 67 transitions. Second operand 11 states. [2020-07-21 16:00:32,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:32,260 INFO L93 Difference]: Finished difference Result 63 states and 99 transitions. [2020-07-21 16:00:32,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:32,261 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 16:00:32,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:32,263 INFO L225 Difference]: With dead ends: 63 [2020-07-21 16:00:32,263 INFO L226 Difference]: Without dead ends: 59 [2020-07-21 16:00:32,267 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 68 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 16:00:32,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-21 16:00:32,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2020-07-21 16:00:32,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 16:00:32,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 77 transitions. [2020-07-21 16:00:32,286 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 77 transitions. Word has length 41 [2020-07-21 16:00:32,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:32,286 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 77 transitions. [2020-07-21 16:00:32,286 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 16:00:32,286 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 77 transitions. [2020-07-21 16:00:32,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-21 16:00:32,290 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:32,290 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 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 16:00:32,492 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:32,494 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:32,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:32,494 INFO L82 PathProgramCache]: Analyzing trace with hash -1291563674, now seen corresponding path program 1 times [2020-07-21 16:00:32,495 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:32,495 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [289069352] [2020-07-21 16:00:32,496 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:00:32,534 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:32,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:32,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:00:32,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:32,586 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 16:00:32,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:32,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:32,848 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:32,892 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 16:00:32,897 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [289069352] [2020-07-21 16:00:32,898 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:32,898 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-21 16:00:32,898 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112152409] [2020-07-21 16:00:32,899 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 16:00:32,900 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:32,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 16:00:32,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-21 16:00:32,915 INFO L87 Difference]: Start difference. First operand 51 states and 77 transitions. Second operand 9 states. [2020-07-21 16:00:33,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:33,057 INFO L93 Difference]: Finished difference Result 65 states and 105 transitions. [2020-07-21 16:00:33,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:00:33,058 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 53 [2020-07-21 16:00:33,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:33,061 INFO L225 Difference]: With dead ends: 65 [2020-07-21 16:00:33,061 INFO L226 Difference]: Without dead ends: 61 [2020-07-21 16:00:33,062 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 95 SyntacticMatches, 5 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2020-07-21 16:00:33,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-21 16:00:33,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2020-07-21 16:00:33,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-21 16:00:33,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 82 transitions. [2020-07-21 16:00:33,077 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 82 transitions. Word has length 53 [2020-07-21 16:00:33,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:33,078 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 82 transitions. [2020-07-21 16:00:33,078 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 16:00:33,078 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 82 transitions. [2020-07-21 16:00:33,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-21 16:00:33,081 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:33,081 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:33,287 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:33,288 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:33,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:33,289 INFO L82 PathProgramCache]: Analyzing trace with hash 736840020, now seen corresponding path program 2 times [2020-07-21 16:00:33,289 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:33,290 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [638645450] [2020-07-21 16:00:33,290 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:00:33,349 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:33,349 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:33,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:00:33,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:33,439 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 55 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-21 16:00:33,440 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:33,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:33,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:34,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:34,051 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:34,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:34,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:34,174 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 59 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-07-21 16:00:34,175 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [638645450] [2020-07-21 16:00:34,176 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:34,176 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 16:00:34,176 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177678504] [2020-07-21 16:00:34,177 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 16:00:34,178 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:34,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 16:00:34,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 16:00:34,179 INFO L87 Difference]: Start difference. First operand 53 states and 82 transitions. Second operand 13 states. [2020-07-21 16:00:34,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:34,429 INFO L93 Difference]: Finished difference Result 75 states and 134 transitions. [2020-07-21 16:00:34,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:00:34,430 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 78 [2020-07-21 16:00:34,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:34,433 INFO L225 Difference]: With dead ends: 75 [2020-07-21 16:00:34,434 INFO L226 Difference]: Without dead ends: 71 [2020-07-21 16:00:34,435 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 137 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:00:34,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-21 16:00:34,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 56. [2020-07-21 16:00:34,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 16:00:34,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 90 transitions. [2020-07-21 16:00:34,453 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 90 transitions. Word has length 78 [2020-07-21 16:00:34,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:34,454 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 90 transitions. [2020-07-21 16:00:34,454 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 16:00:34,455 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 90 transitions. [2020-07-21 16:00:34,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 16:00:34,457 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:34,457 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 16:00:34,659 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:34,661 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:34,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:34,662 INFO L82 PathProgramCache]: Analyzing trace with hash 977113353, now seen corresponding path program 1 times [2020-07-21 16:00:34,662 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:34,663 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [938646839] [2020-07-21 16:00:34,664 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:00:34,720 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:34,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:34,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:34,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:34,804 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 54 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 16:00:34,804 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:35,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:35,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:35,245 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-21 16:00:35,246 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [938646839] [2020-07-21 16:00:35,246 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:35,246 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-21 16:00:35,246 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [887686872] [2020-07-21 16:00:35,247 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:35,247 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:35,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:35,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:35,248 INFO L87 Difference]: Start difference. First operand 56 states and 90 transitions. Second operand 12 states. [2020-07-21 16:00:35,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:35,506 INFO L93 Difference]: Finished difference Result 114 states and 219 transitions. [2020-07-21 16:00:35,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:35,507 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 67 [2020-07-21 16:00:35,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:35,509 INFO L225 Difference]: With dead ends: 114 [2020-07-21 16:00:35,510 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 16:00:35,522 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 119 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:00:35,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 16:00:35,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-21 16:00:35,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 16:00:35,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 101 transitions. [2020-07-21 16:00:35,559 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 101 transitions. Word has length 67 [2020-07-21 16:00:35,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:35,563 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 101 transitions. [2020-07-21 16:00:35,563 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:35,563 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 101 transitions. [2020-07-21 16:00:35,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 16:00:35,567 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:35,567 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 16:00:35,781 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:35,783 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:35,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:35,784 INFO L82 PathProgramCache]: Analyzing trace with hash 643857677, now seen corresponding path program 2 times [2020-07-21 16:00:35,785 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:35,785 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1299973424] [2020-07-21 16:00:35,786 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:00:35,876 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:35,877 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:35,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:35,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:36,003 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 23 proven. 31 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-21 16:00:36,003 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:36,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,670 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,741 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,796 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 23 proven. 33 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2020-07-21 16:00:36,797 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1299973424] [2020-07-21 16:00:36,797 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:36,797 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 16:00:36,798 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585106115] [2020-07-21 16:00:36,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:00:36,799 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:36,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:00:36,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:00:36,800 INFO L87 Difference]: Start difference. First operand 61 states and 101 transitions. Second operand 17 states. [2020-07-21 16:00:37,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:37,302 INFO L93 Difference]: Finished difference Result 131 states and 252 transitions. [2020-07-21 16:00:37,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:00:37,303 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 67 [2020-07-21 16:00:37,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:37,306 INFO L225 Difference]: With dead ends: 131 [2020-07-21 16:00:37,306 INFO L226 Difference]: Without dead ends: 76 [2020-07-21 16:00:37,310 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 113 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-21 16:00:37,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-21 16:00:37,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 68. [2020-07-21 16:00:37,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-07-21 16:00:37,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 106 transitions. [2020-07-21 16:00:37,345 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 106 transitions. Word has length 67 [2020-07-21 16:00:37,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:37,345 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 106 transitions. [2020-07-21 16:00:37,345 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:00:37,346 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 106 transitions. [2020-07-21 16:00:37,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 16:00:37,350 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:37,351 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 16:00:37,564 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:37,565 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:37,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:37,566 INFO L82 PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 3 times [2020-07-21 16:00:37,567 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:37,567 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2006696555] [2020-07-21 16:00:37,568 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:37,623 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:37,624 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 16:00:37,624 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 16:00:37,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 16:00:37,642 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 16:00:37,670 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 16:00:37,670 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 16:00:37,884 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:37,922 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 04:00:37 BoogieIcfgContainer [2020-07-21 16:00:37,923 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 16:00:37,926 INFO L168 Benchmark]: Toolchain (without parser) took 12538.55 ms. Allocated memory was 136.8 MB in the beginning and 316.1 MB in the end (delta: 179.3 MB). Free memory was 102.2 MB in the beginning and 115.3 MB in the end (delta: -13.1 MB). Peak memory consumption was 166.2 MB. Max. memory is 7.1 GB. [2020-07-21 16:00:37,926 INFO L168 Benchmark]: CDTParser took 0.40 ms. Allocated memory is still 136.8 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-21 16:00:37,927 INFO L168 Benchmark]: CACSL2BoogieTranslator took 376.08 ms. Allocated memory is still 136.8 MB. Free memory was 101.7 MB in the beginning and 92.3 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-07-21 16:00:37,928 INFO L168 Benchmark]: Boogie Preprocessor took 45.59 ms. Allocated memory is still 136.8 MB. Free memory was 92.3 MB in the beginning and 90.7 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.6 MB. Max. memory is 7.1 GB. [2020-07-21 16:00:37,929 INFO L168 Benchmark]: RCFGBuilder took 553.04 ms. Allocated memory was 136.8 MB in the beginning and 202.9 MB in the end (delta: 66.1 MB). Free memory was 90.7 MB in the beginning and 169.3 MB in the end (delta: -78.6 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. [2020-07-21 16:00:37,929 INFO L168 Benchmark]: TraceAbstraction took 11555.28 ms. Allocated memory was 202.9 MB in the beginning and 316.1 MB in the end (delta: 113.2 MB). Free memory was 168.6 MB in the beginning and 115.3 MB in the end (delta: 53.3 MB). Peak memory consumption was 166.5 MB. Max. memory is 7.1 GB. [2020-07-21 16:00:37,933 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.40 ms. Allocated memory is still 136.8 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 376.08 ms. Allocated memory is still 136.8 MB. Free memory was 101.7 MB in the beginning and 92.3 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 45.59 ms. Allocated memory is still 136.8 MB. Free memory was 92.3 MB in the beginning and 90.7 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 553.04 ms. Allocated memory was 136.8 MB in the beginning and 202.9 MB in the end (delta: 66.1 MB). Free memory was 90.7 MB in the beginning and 169.3 MB in the end (delta: -78.6 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 11555.28 ms. Allocated memory was 202.9 MB in the beginning and 316.1 MB in the end (delta: 113.2 MB). Free memory was 168.6 MB in the beginning and 115.3 MB in the end (delta: 53.3 MB). Peak memory consumption was 166.5 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: 11.3s, OverallIterations: 12, TraceHistogramMax: 6, AutomataDifference: 2.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 277 SDtfs, 350 SDslu, 1205 SDs, 0 SdLazy, 1201 SolverSat, 226 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 950 GetRequests, 759 SyntacticMatches, 60 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 162 ImplicationChecksByTransitivity, 1.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=68occurred in iteration=11, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 11 MinimizatonAttempts, 63 StatesRemovedByMinimization, 10 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 4.9s InterpolantComputationTime, 533 NumberOfCodeBlocks, 447 NumberOfCodeBlocksAsserted, 21 NumberOfCheckSat, 883 ConstructedInterpolants, 0 QuantifiedInterpolants, 96581 SizeOfPredicates, 43 NumberOfNonLiveVariables, 930 ConjunctsInSsa, 80 ConjunctsInUnsatCore, 20 InterpolantComputations, 2 PerfectInterpolantSequences, 469/754 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...