/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/id2_b3_o2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:02:19,760 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-21 16:02:19,785 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:02:19,788 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:02:19,790 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:02:19,803 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:02:19,807 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:02:19,810 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:02:19,812 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:02:19,813 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:02:19,813 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:02:19,816 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:02:19,818 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:02:19,820 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:02:19,822 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:02:19,823 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:02:19,825 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:02:19,830 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:02:19,836 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:02:19,840 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:02:19,841 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:02:19,842 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:02:19,845 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:02:19,860 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 16:02:19,902 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:02:19,902 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:02:19,908 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:02:19,908 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:02:19,910 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:02:19,910 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:02:19,910 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:02:19,910 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:02:19,911 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:02:19,911 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:02:19,911 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:02:19,911 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:02:19,911 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:02:19,912 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:02:19,912 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:02:19,912 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:02:19,912 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:02:19,912 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:02:19,914 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:02:19,915 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:02:19,915 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:02:19,915 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:02:19,915 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:02:19,916 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:02:19,916 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:02:19,916 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:02:19,916 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:19,917 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:02:19,917 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:02:19,918 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 16:02:20,269 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:02:20,288 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:02:20,293 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:02:20,296 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:02:20,296 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:02:20,298 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_b3_o2.c [2020-07-21 16:02:20,401 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a295f4196/23a6fe18d8c8472d80d6721a741bf3c9/FLAG2abc279f4 [2020-07-21 16:02:20,933 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:02:20,934 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_b3_o2.c [2020-07-21 16:02:20,943 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a295f4196/23a6fe18d8c8472d80d6721a741bf3c9/FLAG2abc279f4 [2020-07-21 16:02:21,294 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a295f4196/23a6fe18d8c8472d80d6721a741bf3c9 [2020-07-21 16:02:21,303 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:02:21,305 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:02:21,307 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:02:21,307 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:02:21,311 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:02:21,312 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:02:21" (1/1) ... [2020-07-21 16:02:21,315 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@78313dbe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:21, skipping insertion in model container [2020-07-21 16:02:21,315 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:02:21" (1/1) ... [2020-07-21 16:02:21,323 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:02:21,341 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:02:21,501 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:02:21,506 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:02:21,521 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:02:21,535 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:02:21,536 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:21 WrapperNode [2020-07-21 16:02:21,536 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:02:21,537 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:02:21,537 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:02:21,537 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:02:21,547 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:21" (1/1) ... [2020-07-21 16:02:21,547 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:21" (1/1) ... [2020-07-21 16:02:21,552 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:21" (1/1) ... [2020-07-21 16:02:21,553 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:21" (1/1) ... [2020-07-21 16:02:21,654 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:21" (1/1) ... [2020-07-21 16:02:21,656 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:21" (1/1) ... [2020-07-21 16:02:21,657 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:21" (1/1) ... [2020-07-21 16:02:21,659 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:02:21,660 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:02:21,660 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:02:21,660 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:02:21,661 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:21" (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 16:02:21,727 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:02:21,728 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:02:21,728 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 16:02:21,728 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-07-21 16:02:21,728 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:02:21,728 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 16:02:21,729 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:02:21,729 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 16:02:21,729 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-07-21 16:02:21,729 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:02:21,729 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:02:21,729 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:02:21,983 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:02:21,983 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 16:02:21,989 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:02:21 BoogieIcfgContainer [2020-07-21 16:02:21,990 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:02:21,992 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:02:21,992 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:02:21,996 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:02:21,997 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:02:21" (1/3) ... [2020-07-21 16:02:21,998 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@67733ae3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:02:21, skipping insertion in model container [2020-07-21 16:02:21,998 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:21" (2/3) ... [2020-07-21 16:02:21,999 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@67733ae3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:02:21, skipping insertion in model container [2020-07-21 16:02:21,999 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:02:21" (3/3) ... [2020-07-21 16:02:22,002 INFO L109 eAbstractionObserver]: Analyzing ICFG id2_b3_o2.c [2020-07-21 16:02:22,015 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:02:22,050 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:02:22,075 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:02:22,109 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:02:22,109 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:02:22,110 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:02:22,110 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:02:22,110 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:02:22,110 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:02:22,110 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:02:22,110 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:02:22,138 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-21 16:02:22,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 16:02:22,149 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:22,151 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:22,152 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:22,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:22,160 INFO L82 PathProgramCache]: Analyzing trace with hash 128923731, now seen corresponding path program 1 times [2020-07-21 16:02:22,171 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:22,172 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1769387974] [2020-07-21 16:02:22,172 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 16:02:22,263 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:22,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:22,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 16:02:22,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:22,370 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 16:02:22,370 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:02:22,372 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1769387974] [2020-07-21 16:02:22,377 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:02:22,377 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:02:22,379 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604011828] [2020-07-21 16:02:22,387 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:02:22,388 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:22,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:02:22,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:02:22,405 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 5 states. [2020-07-21 16:02:22,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:22,488 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2020-07-21 16:02:22,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:02:22,491 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 16:02:22,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:22,504 INFO L225 Difference]: With dead ends: 40 [2020-07-21 16:02:22,505 INFO L226 Difference]: Without dead ends: 26 [2020-07-21 16:02:22,511 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 16:02:22,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-07-21 16:02:22,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-07-21 16:02:22,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 16:02:22,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2020-07-21 16:02:22,586 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 13 [2020-07-21 16:02:22,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:22,587 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2020-07-21 16:02:22,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:02:22,587 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2020-07-21 16:02:22,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 16:02:22,591 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:22,591 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:22,806 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:22,806 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:22,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:22,807 INFO L82 PathProgramCache]: Analyzing trace with hash 1945633833, now seen corresponding path program 1 times [2020-07-21 16:02:22,808 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:22,808 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [64244745] [2020-07-21 16:02:22,808 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 16:02:22,852 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:22,852 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:22,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 16:02:22,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:22,896 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 16:02:22,897 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:02:22,898 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [64244745] [2020-07-21 16:02:22,898 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:02:22,898 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:02:22,899 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104072012] [2020-07-21 16:02:22,901 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:02:22,902 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:22,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:02:22,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:02:22,904 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand 5 states. [2020-07-21 16:02:22,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:22,948 INFO L93 Difference]: Finished difference Result 44 states and 52 transitions. [2020-07-21 16:02:22,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:02:22,949 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-07-21 16:02:22,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:22,951 INFO L225 Difference]: With dead ends: 44 [2020-07-21 16:02:22,952 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 16:02:22,954 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 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 16:02:22,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 16:02:22,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 16:02:22,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 16:02:22,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-07-21 16:02:22,966 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 20 [2020-07-21 16:02:22,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:22,967 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-07-21 16:02:22,967 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:02:22,968 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-07-21 16:02:22,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 16:02:22,970 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:22,970 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:23,184 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:23,185 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:23,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:23,187 INFO L82 PathProgramCache]: Analyzing trace with hash 1974262984, now seen corresponding path program 1 times [2020-07-21 16:02:23,187 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:23,188 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [745754168] [2020-07-21 16:02:23,188 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 16:02:23,234 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:23,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:23,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 16:02:23,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:23,341 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 16:02:23,342 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:02:23,343 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [745754168] [2020-07-21 16:02:23,343 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:02:23,346 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 16:02:23,346 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876299725] [2020-07-21 16:02:23,347 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 16:02:23,348 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:23,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 16:02:23,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-07-21 16:02:23,351 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 8 states. [2020-07-21 16:02:23,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:23,510 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2020-07-21 16:02:23,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:02:23,511 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-07-21 16:02:23,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:23,515 INFO L225 Difference]: With dead ends: 36 [2020-07-21 16:02:23,515 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 16:02:23,516 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-07-21 16:02:23,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 16:02:23,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 16:02:23,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 16:02:23,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-07-21 16:02:23,541 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 20 [2020-07-21 16:02:23,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:23,543 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-07-21 16:02:23,543 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 16:02:23,543 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-07-21 16:02:23,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 16:02:23,548 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:23,548 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 16:02:23,749 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:23,750 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:23,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:23,751 INFO L82 PathProgramCache]: Analyzing trace with hash 1423155149, now seen corresponding path program 1 times [2020-07-21 16:02:23,751 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:23,751 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [24245005] [2020-07-21 16:02:23,752 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 16:02:23,791 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:23,792 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:23,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 16:02:23,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:23,840 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 16:02:23,841 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:02:23,842 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [24245005] [2020-07-21 16:02:23,842 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:02:23,842 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:02:23,843 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83981335] [2020-07-21 16:02:23,844 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:02:23,844 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:23,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:02:23,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:02:23,846 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 5 states. [2020-07-21 16:02:23,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:23,877 INFO L93 Difference]: Finished difference Result 48 states and 55 transitions. [2020-07-21 16:02:23,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:02:23,878 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 27 [2020-07-21 16:02:23,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:23,880 INFO L225 Difference]: With dead ends: 48 [2020-07-21 16:02:23,880 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 16:02:23,881 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 23 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 16:02:23,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 16:02:23,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2020-07-21 16:02:23,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-21 16:02:23,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2020-07-21 16:02:23,891 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 27 [2020-07-21 16:02:23,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:23,892 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2020-07-21 16:02:23,892 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:02:23,893 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2020-07-21 16:02:23,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 16:02:23,894 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:23,895 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 16:02:24,110 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:24,111 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:24,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:24,112 INFO L82 PathProgramCache]: Analyzing trace with hash 1226641644, now seen corresponding path program 1 times [2020-07-21 16:02:24,113 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:24,114 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1217332723] [2020-07-21 16:02:24,114 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 16:02:24,146 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:24,147 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:24,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 16:02:24,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:24,236 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 16:02:24,236 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:02:24,254 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1217332723] [2020-07-21 16:02:24,255 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:02:24,256 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 16:02:24,258 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607350092] [2020-07-21 16:02:24,261 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 16:02:24,262 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:24,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 16:02:24,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-07-21 16:02:24,265 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand 8 states. [2020-07-21 16:02:24,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:24,381 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-07-21 16:02:24,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:02:24,383 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-07-21 16:02:24,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:24,385 INFO L225 Difference]: With dead ends: 52 [2020-07-21 16:02:24,386 INFO L226 Difference]: Without dead ends: 40 [2020-07-21 16:02:24,387 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-07-21 16:02:24,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-07-21 16:02:24,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 38. [2020-07-21 16:02:24,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-21 16:02:24,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2020-07-21 16:02:24,410 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 27 [2020-07-21 16:02:24,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:24,412 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2020-07-21 16:02:24,412 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 16:02:24,413 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2020-07-21 16:02:24,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 16:02:24,420 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:24,421 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 16:02:24,635 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:24,636 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:24,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:24,638 INFO L82 PathProgramCache]: Analyzing trace with hash 1255270795, now seen corresponding path program 1 times [2020-07-21 16:02:24,638 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:24,639 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2106364840] [2020-07-21 16:02:24,640 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 16:02:24,677 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:24,677 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 16:02:24,678 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 16:02:24,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 16:02:24,691 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 16:02:24,714 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 16:02:24,714 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 16:02:24,928 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:24,997 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 04:02:24 BoogieIcfgContainer [2020-07-21 16:02:24,997 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 16:02:25,010 INFO L168 Benchmark]: Toolchain (without parser) took 3695.44 ms. Allocated memory was 144.2 MB in the beginning and 233.3 MB in the end (delta: 89.1 MB). Free memory was 101.8 MB in the beginning and 187.5 MB in the end (delta: -85.7 MB). Peak memory consumption was 3.5 MB. Max. memory is 7.1 GB. [2020-07-21 16:02:25,011 INFO L168 Benchmark]: CDTParser took 0.73 ms. Allocated memory is still 144.2 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 16:02:25,015 INFO L168 Benchmark]: CACSL2BoogieTranslator took 229.65 ms. Allocated memory is still 144.2 MB. Free memory was 101.4 MB in the beginning and 91.9 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-21 16:02:25,016 INFO L168 Benchmark]: Boogie Preprocessor took 122.63 ms. Allocated memory was 144.2 MB in the beginning and 202.4 MB in the end (delta: 58.2 MB). Free memory was 91.9 MB in the beginning and 181.5 MB in the end (delta: -89.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2020-07-21 16:02:25,017 INFO L168 Benchmark]: RCFGBuilder took 330.36 ms. Allocated memory is still 202.4 MB. Free memory was 181.5 MB in the beginning and 168.9 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 7.1 GB. [2020-07-21 16:02:25,030 INFO L168 Benchmark]: TraceAbstraction took 3005.82 ms. Allocated memory was 202.4 MB in the beginning and 233.3 MB in the end (delta: 30.9 MB). Free memory was 168.2 MB in the beginning and 187.5 MB in the end (delta: -19.3 MB). Peak memory consumption was 11.7 MB. Max. memory is 7.1 GB. [2020-07-21 16:02:25,036 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.73 ms. Allocated memory is still 144.2 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 229.65 ms. Allocated memory is still 144.2 MB. Free memory was 101.4 MB in the beginning and 91.9 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 122.63 ms. Allocated memory was 144.2 MB in the beginning and 202.4 MB in the end (delta: 58.2 MB). Free memory was 91.9 MB in the beginning and 181.5 MB in the end (delta: -89.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 330.36 ms. Allocated memory is still 202.4 MB. Free memory was 181.5 MB in the beginning and 168.9 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3005.82 ms. Allocated memory was 202.4 MB in the beginning and 233.3 MB in the end (delta: 30.9 MB). Free memory was 168.2 MB in the beginning and 187.5 MB in the end (delta: -19.3 MB). Peak memory consumption was 11.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 25]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L22] unsigned int input = __VERIFIER_nondet_uint(); [L23] CALL, EXPR id(input) VAL [\old(x)=2] [L8] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L9] CALL, EXPR id2(x-1) VAL [\old(x)=1] [L15] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L16] CALL, EXPR id(x-1) VAL [\old(x)=0] [L8] COND TRUE x==0 [L8] return 0; VAL [\old(x)=0, \result=0, x=0] [L16] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L16] unsigned int ret = id(x-1) + 1; [L17] COND FALSE !(ret > 3) [L18] return ret; VAL [\old(x)=1, \result=1, ret=1, x=1] [L9] RET, EXPR id2(x-1) VAL [\old(x)=2, id2(x-1)=1, x=2] [L9] unsigned int ret = id2(x-1) + 1; [L10] COND FALSE !(ret > 3) [L11] return ret; VAL [\old(x)=2, \result=2, ret=2, x=2] [L23] RET, EXPR id(input) VAL [id(input)=2, input=2] [L23] unsigned int result = id(input); [L24] COND TRUE result == 2 VAL [input=2, result=2] [L25] __VERIFIER_error() VAL [input=2, result=2] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 28 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.8s, OverallIterations: 6, TraceHistogramMax: 2, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 143 SDtfs, 12 SDslu, 562 SDs, 0 SdLazy, 95 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 104 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=38occurred 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: 0.1s AutomataMinimizationTime, 5 MinimizatonAttempts, 8 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 134 NumberOfCodeBlocks, 98 NumberOfCodeBlocksAsserted, 9 NumberOfCheckSat, 102 ConstructedInterpolants, 0 QuantifiedInterpolants, 3394 SizeOfPredicates, 7 NumberOfNonLiveVariables, 184 ConjunctsInSsa, 47 ConjunctsInUnsatCore, 5 InterpolantComputations, 5 PerfectInterpolantSequences, 8/8 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...