/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_o20.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 13:25:26,849 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 13:25:26,851 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 13:25:26,866 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 13:25:26,867 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 13:25:26,868 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 13:25:26,869 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 13:25:26,871 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 13:25:26,873 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 13:25:26,874 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 13:25:26,875 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 13:25:26,876 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 13:25:26,876 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 13:25:26,877 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 13:25:26,878 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 13:25:26,879 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 13:25:26,880 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 13:25:26,881 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 13:25:26,883 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 13:25:26,885 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 13:25:26,887 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 13:25:26,888 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 13:25:26,890 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 13:25:26,890 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 13:25:26,893 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 13:25:26,902 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 13:25:26,903 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 13:25:26,904 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 13:25:26,904 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 13:25:26,920 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 13:25:26,920 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 13:25:26,921 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 13:25:26,921 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 13:25:26,922 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 13:25:26,922 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 13:25:26,922 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 13:25:26,922 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 13:25:26,922 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 13:25:26,923 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 13:25:26,923 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 13:25:26,923 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 13:25:26,923 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 13:25:26,923 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 13:25:26,924 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 13:25:26,924 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 13:25:26,924 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 13:25:26,924 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 13:25:26,924 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 13:25:26,925 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 13:25:26,925 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 13:25:26,925 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:25:26,925 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 13:25:26,926 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 13:25:26,926 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 13:25:26,926 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 13:25:26,926 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:26,926 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 13:25:26,926 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 13:25:26,927 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 13:25:27,212 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 13:25:27,226 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 13:25:27,230 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 13:25:27,232 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 13:25:27,233 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 13:25:27,234 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o20.c [2020-07-21 13:25:27,303 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/08afcd140/91afdaa7d77345499649ab54d5186566/FLAG783820e5f [2020-07-21 13:25:27,730 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 13:25:27,731 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_o20.c [2020-07-21 13:25:27,737 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/08afcd140/91afdaa7d77345499649ab54d5186566/FLAG783820e5f [2020-07-21 13:25:28,118 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/08afcd140/91afdaa7d77345499649ab54d5186566 [2020-07-21 13:25:28,129 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 13:25:28,132 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 13:25:28,133 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 13:25:28,134 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 13:25:28,137 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 13:25:28,139 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:25:28" (1/1) ... [2020-07-21 13:25:28,142 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4eda3b5c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:28, skipping insertion in model container [2020-07-21 13:25:28,143 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:25:28" (1/1) ... [2020-07-21 13:25:28,151 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 13:25:28,168 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 13:25:28,327 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:25:28,332 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 13:25:28,349 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:25:28,365 INFO L208 MainTranslator]: Completed translation [2020-07-21 13:25:28,365 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:28 WrapperNode [2020-07-21 13:25:28,365 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 13:25:28,366 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 13:25:28,366 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 13:25:28,367 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 13:25:28,382 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:28" (1/1) ... [2020-07-21 13:25:28,382 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:28" (1/1) ... [2020-07-21 13:25:28,388 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:28" (1/1) ... [2020-07-21 13:25:28,388 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:28" (1/1) ... [2020-07-21 13:25:28,392 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:28" (1/1) ... [2020-07-21 13:25:28,395 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:28" (1/1) ... [2020-07-21 13:25:28,396 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:28" (1/1) ... [2020-07-21 13:25:28,397 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 13:25:28,398 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 13:25:28,398 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 13:25:28,398 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 13:25:28,399 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:28" (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 13:25:28,572 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 13:25:28,572 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 13:25:28,572 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 13:25:28,572 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 13:25:28,572 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 13:25:28,573 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 13:25:28,573 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 13:25:28,573 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 13:25:28,573 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 13:25:28,573 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 13:25:28,739 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 13:25:28,739 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 13:25:28,743 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:25:28 BoogieIcfgContainer [2020-07-21 13:25:28,743 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 13:25:28,744 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 13:25:28,744 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 13:25:28,747 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 13:25:28,747 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:25:28" (1/3) ... [2020-07-21 13:25:28,748 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d9b08d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:25:28, skipping insertion in model container [2020-07-21 13:25:28,748 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:28" (2/3) ... [2020-07-21 13:25:28,748 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d9b08d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:25:28, skipping insertion in model container [2020-07-21 13:25:28,749 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:25:28" (3/3) ... [2020-07-21 13:25:28,750 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o20.c [2020-07-21 13:25:28,758 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 13:25:28,765 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 13:25:28,779 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 13:25:28,805 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 13:25:28,805 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 13:25:28,805 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 13:25:28,805 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 13:25:28,805 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 13:25:28,806 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 13:25:28,806 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 13:25:28,806 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 13:25:28,825 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 13:25:28,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 13:25:28,832 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:28,833 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:25:28,833 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:28,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:28,839 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-21 13:25:28,848 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:28,849 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1215320638] [2020-07-21 13:25:28,849 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 13:25:28,927 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:28,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:28,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:25:28,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:29,024 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 13:25:29,024 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:25:29,025 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1215320638] [2020-07-21 13:25:29,026 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:25:29,026 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 13:25:29,027 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702568390] [2020-07-21 13:25:29,032 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 13:25:29,032 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:25:29,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 13:25:29,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:25:29,051 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-21 13:25:29,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:29,104 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-07-21 13:25:29,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:25:29,107 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 13:25:29,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:29,120 INFO L225 Difference]: With dead ends: 32 [2020-07-21 13:25:29,121 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 13:25:29,124 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:25:29,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 13:25:29,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 13:25:29,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 13:25:29,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-21 13:25:29,168 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-21 13:25:29,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:29,169 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-21 13:25:29,169 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 13:25:29,169 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-21 13:25:29,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 13:25:29,171 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:29,171 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:25:29,386 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:29,386 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:29,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:29,388 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-21 13:25:29,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:29,390 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1410242204] [2020-07-21 13:25:29,390 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 13:25:29,427 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:29,427 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:29,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 13:25:29,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:29,504 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 13:25:29,504 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:25:29,679 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 13:25:29,680 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1410242204] [2020-07-21 13:25:29,680 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:25:29,680 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 13:25:29,681 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [393299735] [2020-07-21 13:25:29,683 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 13:25:29,683 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:25:29,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 13:25:29,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-21 13:25:29,686 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states. [2020-07-21 13:25:29,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:29,773 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-07-21 13:25:29,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:25:29,774 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-07-21 13:25:29,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:29,775 INFO L225 Difference]: With dead ends: 30 [2020-07-21 13:25:29,775 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 13:25:29,777 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-21 13:25:29,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 13:25:29,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-21 13:25:29,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-21 13:25:29,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-21 13:25:29,784 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2020-07-21 13:25:29,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:29,785 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-21 13:25:29,785 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 13:25:29,785 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-21 13:25:29,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 13:25:29,786 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:29,787 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:25:29,987 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:29,988 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:29,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:29,989 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 2 times [2020-07-21 13:25:29,990 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:29,990 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1970276654] [2020-07-21 13:25:29,990 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 13:25:30,037 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:30,038 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:30,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 13:25:30,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:30,153 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-21 13:25:30,154 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:25:30,584 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-21 13:25:30,585 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1970276654] [2020-07-21 13:25:30,585 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:25:30,585 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-07-21 13:25:30,586 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338523564] [2020-07-21 13:25:30,586 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 13:25:30,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:25:30,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 13:25:30,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2020-07-21 13:25:30,588 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 20 states. [2020-07-21 13:25:32,763 WARN L193 SmtUtils]: Spent 2.08 s on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 13:25:35,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:35,091 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2020-07-21 13:25:35,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 13:25:35,092 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 31 [2020-07-21 13:25:35,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:35,095 INFO L225 Difference]: With dead ends: 42 [2020-07-21 13:25:35,095 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 13:25:35,096 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=97, Invalid=454, Unknown=1, NotChecked=0, Total=552 [2020-07-21 13:25:35,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 13:25:35,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-21 13:25:35,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 13:25:35,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-21 13:25:35,106 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 31 [2020-07-21 13:25:35,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:35,107 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-21 13:25:35,107 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 13:25:35,107 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-21 13:25:35,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-21 13:25:35,109 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:35,109 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:25:35,312 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:35,313 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:35,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:35,314 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 3 times [2020-07-21 13:25:35,315 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:35,315 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [315825942] [2020-07-21 13:25:35,316 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 13:25:35,366 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:35,366 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:35,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-21 13:25:35,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:35,615 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-21 13:25:35,616 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:25:37,203 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-21 13:25:37,204 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [315825942] [2020-07-21 13:25:37,204 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:25:37,204 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 36 [2020-07-21 13:25:37,205 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701923654] [2020-07-21 13:25:37,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 13:25:37,206 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:25:37,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 13:25:37,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1076, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 13:25:37,207 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 36 states. [2020-07-21 13:25:38,105 WARN L193 SmtUtils]: Spent 339.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:25:38,786 WARN L193 SmtUtils]: Spent 374.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-21 13:25:40,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:40,650 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2020-07-21 13:25:40,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-21 13:25:40,652 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 55 [2020-07-21 13:25:40,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:40,655 INFO L225 Difference]: With dead ends: 66 [2020-07-21 13:25:40,655 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 13:25:40,657 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=382, Invalid=1874, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 13:25:40,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 13:25:40,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-07-21 13:25:40,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 13:25:40,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-07-21 13:25:40,668 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 55 [2020-07-21 13:25:40,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:40,669 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-07-21 13:25:40,669 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 13:25:40,669 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-07-21 13:25:40,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-07-21 13:25:40,673 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:40,673 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:25:40,880 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:40,881 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:40,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:40,882 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 4 times [2020-07-21 13:25:40,883 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:40,883 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [731866125] [2020-07-21 13:25:40,884 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 13:25:40,962 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:40,962 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:40,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-21 13:25:40,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:41,665 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-21 13:25:41,666 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:26:03,300 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 344 refuted. 1 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-21 13:26:03,301 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [731866125] [2020-07-21 13:26:03,301 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:26:03,301 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 68 [2020-07-21 13:26:03,302 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811077610] [2020-07-21 13:26:03,303 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-21 13:26:03,303 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:26:03,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-21 13:26:03,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=495, Invalid=4053, Unknown=8, NotChecked=0, Total=4556 [2020-07-21 13:26:03,306 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 68 states. [2020-07-21 13:26:11,116 WARN L193 SmtUtils]: Spent 2.09 s on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 13:26:17,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:26:17,852 INFO L93 Difference]: Finished difference Result 81 states and 86 transitions. [2020-07-21 13:26:17,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-07-21 13:26:17,854 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 103 [2020-07-21 13:26:17,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:26:17,856 INFO L225 Difference]: With dead ends: 81 [2020-07-21 13:26:17,859 INFO L226 Difference]: Without dead ends: 75 [2020-07-21 13:26:17,862 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 33.7s TimeCoverageRelationStatistics Valid=624, Invalid=4765, Unknown=13, NotChecked=0, Total=5402 [2020-07-21 13:26:17,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-07-21 13:26:17,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2020-07-21 13:26:17,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-07-21 13:26:17,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2020-07-21 13:26:17,876 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 103 [2020-07-21 13:26:17,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:26:17,876 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2020-07-21 13:26:17,877 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-21 13:26:17,877 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2020-07-21 13:26:17,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-21 13:26:17,880 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:26:17,880 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:26:18,083 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:26:18,084 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:26:18,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:26:18,085 INFO L82 PathProgramCache]: Analyzing trace with hash -799288067, now seen corresponding path program 5 times [2020-07-21 13:26:18,085 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:26:18,085 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [638666280] [2020-07-21 13:26:18,086 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 13:26:18,465 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:26:18,465 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 13:26:18,465 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 13:26:18,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 13:26:18,517 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 13:26:18,559 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 13:26:18,560 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 13:26:18,768 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:26:18,822 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 01:26:18 BoogieIcfgContainer [2020-07-21 13:26:18,822 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 13:26:18,824 INFO L168 Benchmark]: Toolchain (without parser) took 50693.31 ms. Allocated memory was 137.4 MB in the beginning and 305.7 MB in the end (delta: 168.3 MB). Free memory was 100.7 MB in the beginning and 215.7 MB in the end (delta: -115.0 MB). Peak memory consumption was 53.3 MB. Max. memory is 7.1 GB. [2020-07-21 13:26:18,825 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 137.4 MB. Free memory is still 118.8 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-21 13:26:18,826 INFO L168 Benchmark]: CACSL2BoogieTranslator took 232.46 ms. Allocated memory is still 137.4 MB. Free memory was 100.7 MB in the beginning and 91.4 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-21 13:26:18,827 INFO L168 Benchmark]: Boogie Preprocessor took 31.28 ms. Allocated memory is still 137.4 MB. Free memory was 91.4 MB in the beginning and 90.2 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-21 13:26:18,828 INFO L168 Benchmark]: RCFGBuilder took 345.43 ms. Allocated memory was 137.4 MB in the beginning and 201.9 MB in the end (delta: 64.5 MB). Free memory was 90.2 MB in the beginning and 171.0 MB in the end (delta: -80.9 MB). Peak memory consumption was 14.4 MB. Max. memory is 7.1 GB. [2020-07-21 13:26:18,829 INFO L168 Benchmark]: TraceAbstraction took 50077.91 ms. Allocated memory was 201.9 MB in the beginning and 305.7 MB in the end (delta: 103.8 MB). Free memory was 170.0 MB in the beginning and 215.7 MB in the end (delta: -45.7 MB). Peak memory consumption was 58.1 MB. Max. memory is 7.1 GB. [2020-07-21 13:26:18,833 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 137.4 MB. Free memory is still 118.8 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 232.46 ms. Allocated memory is still 137.4 MB. Free memory was 100.7 MB in the beginning and 91.4 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 31.28 ms. Allocated memory is still 137.4 MB. Free memory was 91.4 MB in the beginning and 90.2 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 345.43 ms. Allocated memory was 137.4 MB in the beginning and 201.9 MB in the end (delta: 64.5 MB). Free memory was 90.2 MB in the beginning and 171.0 MB in the end (delta: -80.9 MB). Peak memory consumption was 14.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 50077.91 ms. Allocated memory was 201.9 MB in the beginning and 305.7 MB in the end (delta: 103.8 MB). Free memory was 170.0 MB in the beginning and 215.7 MB in the end (delta: -45.7 MB). Peak memory consumption was 58.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] unsigned int input = __VERIFIER_nondet_uint(); [L11] CALL, EXPR id(input) VAL [\old(x)=20] [L5] COND FALSE !(x==0) VAL [\old(x)=20, x=20] [L6] CALL, EXPR id(x-1) VAL [\old(x)=19] [L5] COND FALSE !(x==0) VAL [\old(x)=19, x=19] [L6] CALL, EXPR id(x-1) VAL [\old(x)=18] [L5] COND FALSE !(x==0) VAL [\old(x)=18, x=18] [L6] CALL, EXPR id(x-1) VAL [\old(x)=17] [L5] COND FALSE !(x==0) VAL [\old(x)=17, x=17] [L6] CALL, EXPR id(x-1) VAL [\old(x)=16] [L5] COND FALSE !(x==0) VAL [\old(x)=16, x=16] [L6] CALL, EXPR id(x-1) VAL [\old(x)=15] [L5] COND FALSE !(x==0) VAL [\old(x)=15, x=15] [L6] CALL, EXPR id(x-1) VAL [\old(x)=14] [L5] COND FALSE !(x==0) VAL [\old(x)=14, x=14] [L6] CALL, EXPR id(x-1) VAL [\old(x)=13] [L5] COND FALSE !(x==0) VAL [\old(x)=13, x=13] [L6] CALL, EXPR id(x-1) VAL [\old(x)=12] [L5] COND FALSE !(x==0) VAL [\old(x)=12, x=12] [L6] CALL, EXPR id(x-1) VAL [\old(x)=11] [L5] COND FALSE !(x==0) VAL [\old(x)=11, x=11] [L6] CALL, EXPR id(x-1) VAL [\old(x)=10] [L5] COND FALSE !(x==0) VAL [\old(x)=10, x=10] [L6] CALL, EXPR id(x-1) VAL [\old(x)=9] [L5] COND FALSE !(x==0) VAL [\old(x)=9, x=9] [L6] CALL, EXPR id(x-1) VAL [\old(x)=8] [L5] COND FALSE !(x==0) VAL [\old(x)=8, x=8] [L6] CALL, EXPR id(x-1) VAL [\old(x)=7] [L5] COND FALSE !(x==0) VAL [\old(x)=7, x=7] [L6] CALL, EXPR id(x-1) VAL [\old(x)=6] [L5] COND FALSE !(x==0) VAL [\old(x)=6, x=6] [L6] CALL, EXPR id(x-1) VAL [\old(x)=5] [L5] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L6] CALL, EXPR id(x-1) VAL [\old(x)=4] [L5] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L6] CALL, EXPR id(x-1) VAL [\old(x)=3] [L5] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L6] CALL, EXPR id(x-1) VAL [\old(x)=2] [L5] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L6] CALL, EXPR id(x-1) VAL [\old(x)=1] [L5] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L6] CALL, EXPR id(x-1) VAL [\old(x)=0] [L5] COND TRUE x==0 [L5] return 0; VAL [\old(x)=0, \result=0, x=0] [L6] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=5, id(x-1)=4, x=5] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=6, id(x-1)=5, x=6] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=7, id(x-1)=6, x=7] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=8, id(x-1)=7, x=8] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=9, id(x-1)=8, x=9] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=10, id(x-1)=9, x=10] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=11, id(x-1)=10, x=11] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=12, id(x-1)=11, x=12] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=13, id(x-1)=12, x=13] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=14, id(x-1)=13, x=14] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=15, id(x-1)=14, x=15] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=16, id(x-1)=15, x=16] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=17, id(x-1)=16, x=17] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=18, id(x-1)=17, x=18] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=19, id(x-1)=18, x=19] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=20, id(x-1)=19, x=20] [L6] return id(x-1) + 1; [L11] RET, EXPR id(input) VAL [id(input)=20, input=20] [L11] unsigned int result = id(input); [L12] COND TRUE result == 20 VAL [input=20, result=20] [L13] __VERIFIER_error() VAL [input=20, result=20] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 49.9s, OverallIterations: 6, TraceHistogramMax: 21, AutomataDifference: 22.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 131 SDtfs, 2 SDslu, 2198 SDs, 0 SdLazy, 1098 SolverSat, 41 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 446 GetRequests, 293 SyntacticMatches, 0 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 717 ImplicationChecksByTransitivity, 42.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=75occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 25.0s InterpolantComputationTime, 354 NumberOfCodeBlocks, 354 NumberOfCodeBlocksAsserted, 12 NumberOfCheckSat, 420 ConstructedInterpolants, 0 QuantifiedInterpolants, 83958 SizeOfPredicates, 5 NumberOfNonLiveVariables, 462 ConjunctsInSsa, 141 ConjunctsInUnsatCore, 9 InterpolantComputations, 1 PerfectInterpolantSequences, 878/1756 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...