/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_o10.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 13:25:15,565 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 13:25:15,567 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 13:25:15,580 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 13:25:15,580 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 13:25:15,581 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 13:25:15,583 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 13:25:15,585 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 13:25:15,586 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 13:25:15,587 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 13:25:15,588 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 13:25:15,589 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 13:25:15,590 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 13:25:15,591 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 13:25:15,592 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 13:25:15,593 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 13:25:15,594 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 13:25:15,594 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 13:25:15,596 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 13:25:15,598 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 13:25:15,599 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 13:25:15,600 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 13:25:15,601 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 13:25:15,602 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 13:25:15,605 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 13:25:15,612 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 13:25:15,613 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 13:25:15,614 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 13:25:15,615 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 13:25:15,630 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 13:25:15,630 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 13:25:15,631 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 13:25:15,632 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 13:25:15,632 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 13:25:15,632 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 13:25:15,632 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 13:25:15,633 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 13:25:15,633 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 13:25:15,633 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 13:25:15,633 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 13:25:15,633 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 13:25:15,633 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 13:25:15,634 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 13:25:15,634 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 13:25:15,634 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 13:25:15,634 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 13:25:15,634 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 13:25:15,635 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 13:25:15,635 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 13:25:15,635 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 13:25:15,635 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:25:15,635 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 13:25:15,636 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 13:25:15,636 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 13:25:15,636 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 13:25:15,636 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:15,636 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 13:25:15,637 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 13:25:15,637 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 13:25:15,937 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 13:25:15,950 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 13:25:15,954 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 13:25:15,956 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 13:25:15,956 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 13:25:15,957 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o10.c [2020-07-21 13:25:16,039 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d67a39510/ef3a278c394e4ed6806b95d249865ea5/FLAG0c832acf0 [2020-07-21 13:25:16,535 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 13:25:16,535 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_o10.c [2020-07-21 13:25:16,544 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d67a39510/ef3a278c394e4ed6806b95d249865ea5/FLAG0c832acf0 [2020-07-21 13:25:16,873 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d67a39510/ef3a278c394e4ed6806b95d249865ea5 [2020-07-21 13:25:16,886 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 13:25:16,889 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 13:25:16,891 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 13:25:16,891 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 13:25:16,895 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 13:25:16,896 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:25:16" (1/1) ... [2020-07-21 13:25:16,900 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@545f455b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:16, skipping insertion in model container [2020-07-21 13:25:16,900 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:25:16" (1/1) ... [2020-07-21 13:25:16,910 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 13:25:16,930 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 13:25:17,104 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:25:17,109 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 13:25:17,124 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:25:17,140 INFO L208 MainTranslator]: Completed translation [2020-07-21 13:25:17,140 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:17 WrapperNode [2020-07-21 13:25:17,141 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 13:25:17,142 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 13:25:17,142 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 13:25:17,142 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 13:25:17,156 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:17" (1/1) ... [2020-07-21 13:25:17,157 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:17" (1/1) ... [2020-07-21 13:25:17,162 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:17" (1/1) ... [2020-07-21 13:25:17,163 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:17" (1/1) ... [2020-07-21 13:25:17,166 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:17" (1/1) ... [2020-07-21 13:25:17,169 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:17" (1/1) ... [2020-07-21 13:25:17,169 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:17" (1/1) ... [2020-07-21 13:25:17,171 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 13:25:17,172 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 13:25:17,172 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 13:25:17,172 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 13:25:17,173 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:17" (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 13:25:17,322 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 13:25:17,322 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 13:25:17,322 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 13:25:17,322 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 13:25:17,323 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 13:25:17,323 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 13:25:17,323 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 13:25:17,323 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 13:25:17,324 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 13:25:17,324 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 13:25:17,507 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 13:25:17,508 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 13:25:17,514 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:25:17 BoogieIcfgContainer [2020-07-21 13:25:17,514 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 13:25:17,516 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 13:25:17,516 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 13:25:17,520 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 13:25:17,520 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:25:16" (1/3) ... [2020-07-21 13:25:17,521 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5222f5d3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:25:17, skipping insertion in model container [2020-07-21 13:25:17,521 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:17" (2/3) ... [2020-07-21 13:25:17,522 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5222f5d3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:25:17, skipping insertion in model container [2020-07-21 13:25:17,522 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:25:17" (3/3) ... [2020-07-21 13:25:17,524 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o10.c [2020-07-21 13:25:17,533 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 13:25:17,539 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 13:25:17,551 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 13:25:17,577 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 13:25:17,577 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 13:25:17,577 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 13:25:17,577 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 13:25:17,577 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 13:25:17,578 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 13:25:17,578 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 13:25:17,578 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 13:25:17,597 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 13:25:17,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 13:25:17,604 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:17,606 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:25:17,606 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:17,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:17,613 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-21 13:25:17,621 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:17,622 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2092861770] [2020-07-21 13:25:17,622 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 13:25:17,695 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:17,695 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:17,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:25:17,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:17,818 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 13:25:17,819 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:25:17,820 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2092861770] [2020-07-21 13:25:17,821 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:25:17,822 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 13:25:17,823 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526188159] [2020-07-21 13:25:17,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 13:25:17,830 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:25:17,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 13:25:17,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:25:17,848 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-21 13:25:17,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:17,897 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-07-21 13:25:17,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:25:17,900 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 13:25:17,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:17,911 INFO L225 Difference]: With dead ends: 32 [2020-07-21 13:25:17,911 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 13:25:17,915 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 13:25:17,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 13:25:17,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 13:25:17,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 13:25:17,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-21 13:25:17,962 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-21 13:25:17,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:17,962 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-21 13:25:17,962 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 13:25:17,963 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-21 13:25:17,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 13:25:17,965 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:17,965 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 13:25:18,171 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:18,172 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:18,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:18,173 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-21 13:25:18,174 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:18,175 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [365861501] [2020-07-21 13:25:18,175 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 13:25:18,213 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:18,214 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:18,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 13:25:18,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:18,278 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 13:25:18,278 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:25:18,480 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 13:25:18,481 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [365861501] [2020-07-21 13:25:18,482 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:25:18,482 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 13:25:18,482 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1389658983] [2020-07-21 13:25:18,484 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 13:25:18,485 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:25:18,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 13:25:18,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-21 13:25:18,486 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states. [2020-07-21 13:25:18,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:18,536 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-07-21 13:25:18,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:25:18,537 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-07-21 13:25:18,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:18,538 INFO L225 Difference]: With dead ends: 30 [2020-07-21 13:25:18,538 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 13:25:18,540 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 13:25:18,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 13:25:18,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-21 13:25:18,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-21 13:25:18,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-21 13:25:18,548 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2020-07-21 13:25:18,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:18,548 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-21 13:25:18,548 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 13:25:18,549 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-21 13:25:18,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 13:25:18,550 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:18,550 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 13:25:18,763 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:18,765 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:18,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:18,766 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 2 times [2020-07-21 13:25:18,766 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:18,767 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [660302230] [2020-07-21 13:25:18,768 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 13:25:18,807 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:18,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:18,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 13:25:18,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:18,921 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 13:25:18,921 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:25:19,321 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 13:25:19,322 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [660302230] [2020-07-21 13:25:19,322 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:25:19,322 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-07-21 13:25:19,323 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347407193] [2020-07-21 13:25:19,323 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 13:25:19,323 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:25:19,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 13:25:19,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2020-07-21 13:25:19,325 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 20 states. [2020-07-21 13:25:19,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:19,656 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2020-07-21 13:25:19,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 13:25:19,656 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 31 [2020-07-21 13:25:19,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:19,658 INFO L225 Difference]: With dead ends: 42 [2020-07-21 13:25:19,658 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 13:25:19,659 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=98, Invalid=454, Unknown=0, NotChecked=0, Total=552 [2020-07-21 13:25:19,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 13:25:19,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-21 13:25:19,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 13:25:19,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-21 13:25:19,668 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 31 [2020-07-21 13:25:19,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:19,669 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-21 13:25:19,669 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 13:25:19,669 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-21 13:25:19,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-21 13:25:19,671 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:19,671 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 13:25:19,879 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:19,880 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:19,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:19,881 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 3 times [2020-07-21 13:25:19,882 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:19,883 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1485439550] [2020-07-21 13:25:19,883 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 13:25:19,944 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:19,944 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:19,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-21 13:25:19,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:20,224 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 13:25:20,225 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:25:21,550 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 13:25:21,551 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1485439550] [2020-07-21 13:25:21,551 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:25:21,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 36 [2020-07-21 13:25:21,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726396289] [2020-07-21 13:25:21,553 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 13:25:21,553 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:25:21,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 13:25:21,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=1085, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 13:25:21,554 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 36 states. [2020-07-21 13:25:22,177 WARN L193 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 13:25:23,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:23,805 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2020-07-21 13:25:23,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-21 13:25:23,806 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 55 [2020-07-21 13:25:23,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:23,808 INFO L225 Difference]: With dead ends: 66 [2020-07-21 13:25:23,808 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 13:25:23,810 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=325, Invalid=1931, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 13:25:23,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 13:25:23,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-07-21 13:25:23,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 13:25:23,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-07-21 13:25:23,822 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 55 [2020-07-21 13:25:23,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:23,822 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-07-21 13:25:23,823 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 13:25:23,823 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-07-21 13:25:23,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-07-21 13:25:23,825 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:23,825 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:25:24,038 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:24,039 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:24,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:24,040 INFO L82 PathProgramCache]: Analyzing trace with hash -1580609155, now seen corresponding path program 4 times [2020-07-21 13:25:24,041 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:24,042 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1894800040] [2020-07-21 13:25:24,042 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 13:25:24,196 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:24,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 13:25:24,196 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 13:25:24,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 13:25:24,287 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 13:25:24,311 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 13:25:24,311 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 13:25:24,512 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:24,553 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 01:25:24 BoogieIcfgContainer [2020-07-21 13:25:24,553 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 13:25:24,556 INFO L168 Benchmark]: Toolchain (without parser) took 7668.30 ms. Allocated memory was 145.2 MB in the beginning and 273.2 MB in the end (delta: 127.9 MB). Free memory was 103.3 MB in the beginning and 234.7 MB in the end (delta: -131.5 MB). There was no memory consumed. Max. memory is 7.1 GB. [2020-07-21 13:25:24,557 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 145.2 MB. Free memory was 121.4 MB in the beginning and 121.2 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. [2020-07-21 13:25:24,558 INFO L168 Benchmark]: CACSL2BoogieTranslator took 250.37 ms. Allocated memory is still 145.2 MB. Free memory was 102.8 MB in the beginning and 93.2 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-21 13:25:24,558 INFO L168 Benchmark]: Boogie Preprocessor took 29.68 ms. Allocated memory is still 145.2 MB. Free memory was 93.2 MB in the beginning and 91.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-21 13:25:24,559 INFO L168 Benchmark]: RCFGBuilder took 342.64 ms. Allocated memory was 145.2 MB in the beginning and 201.9 MB in the end (delta: 56.6 MB). Free memory was 91.9 MB in the beginning and 171.0 MB in the end (delta: -79.1 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-07-21 13:25:24,560 INFO L168 Benchmark]: TraceAbstraction took 7037.60 ms. Allocated memory was 201.9 MB in the beginning and 273.2 MB in the end (delta: 71.3 MB). Free memory was 170.0 MB in the beginning and 234.7 MB in the end (delta: -64.7 MB). Peak memory consumption was 6.6 MB. Max. memory is 7.1 GB. [2020-07-21 13:25:24,565 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 145.2 MB. Free memory was 121.4 MB in the beginning and 121.2 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 250.37 ms. Allocated memory is still 145.2 MB. Free memory was 102.8 MB in the beginning and 93.2 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 29.68 ms. Allocated memory is still 145.2 MB. Free memory was 93.2 MB in the beginning and 91.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 342.64 ms. Allocated memory was 145.2 MB in the beginning and 201.9 MB in the end (delta: 56.6 MB). Free memory was 91.9 MB in the beginning and 171.0 MB in the end (delta: -79.1 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 7037.60 ms. Allocated memory was 201.9 MB in the beginning and 273.2 MB in the end (delta: 71.3 MB). Free memory was 170.0 MB in the beginning and 234.7 MB in the end (delta: -64.7 MB). Peak memory consumption was 6.6 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)=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; [L11] RET, EXPR id(input) VAL [id(input)=10, input=10] [L11] unsigned int result = id(input); [L12] COND TRUE result == 10 VAL [input=10, result=10] [L13] __VERIFIER_error() VAL [input=10, result=10] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 6.9s, OverallIterations: 5, TraceHistogramMax: 11, AutomataDifference: 2.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 90 SDtfs, 2 SDslu, 910 SDs, 0 SdLazy, 299 SolverSat, 21 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 235 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 238 ImplicationChecksByTransitivity, 3.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=60occurred in iteration=4, 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, 4 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 2.5s InterpolantComputationTime, 191 NumberOfCodeBlocks, 191 NumberOfCodeBlocksAsserted, 10 NumberOfCheckSat, 216 ConstructedInterpolants, 0 QuantifiedInterpolants, 23982 SizeOfPredicates, 4 NumberOfNonLiveVariables, 252 ConjunctsInSsa, 74 ConjunctsInUnsatCore, 7 InterpolantComputations, 1 PerfectInterpolantSequences, 188/376 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...