/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/recursive-simple/id2_i5_o5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-22 07:03:11,466 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-22 07:03:11,470 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-22 07:03:11,523 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-22 07:03:11,524 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-22 07:03:11,528 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-22 07:03:11,532 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-22 07:03:11,539 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-22 07:03:11,542 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-22 07:03:11,548 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-22 07:03:11,549 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-22 07:03:11,550 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-22 07:03:11,551 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-22 07:03:11,554 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-22 07:03:11,556 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-22 07:03:11,557 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-22 07:03:11,558 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-22 07:03:11,561 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-22 07:03:11,568 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-22 07:03:11,578 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-22 07:03:11,579 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-22 07:03:11,582 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-22 07:03:11,584 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-22 07:03:11,586 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-22 07:03:11,594 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-22 07:03:11,599 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-22 07:03:11,600 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-22 07:03:11,602 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-22 07:03:11,603 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-22 07:03:11,604 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-22 07:03:11,604 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-22 07:03:11,605 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-22 07:03:11,605 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-22 07:03:11,606 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-22 07:03:11,607 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-22 07:03:11,607 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-22 07:03:11,608 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-22 07:03:11,663 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-22 07:03:11,663 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-22 07:03:11,667 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-22 07:03:11,667 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-22 07:03:11,668 INFO L138 SettingsManager]: * Use SBE=true [2020-12-22 07:03:11,668 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-22 07:03:11,668 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-22 07:03:11,668 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-22 07:03:11,669 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-22 07:03:11,669 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-22 07:03:11,670 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-22 07:03:11,671 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-22 07:03:11,671 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-22 07:03:11,671 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-22 07:03:11,671 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-22 07:03:11,672 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-22 07:03:11,690 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-22 07:03:11,690 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-22 07:03:11,690 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-22 07:03:11,690 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-22 07:03:11,691 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-22 07:03:11,691 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-22 07:03:11,691 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-22 07:03:11,691 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-22 07:03:11,691 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-22 07:03:11,691 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-22 07:03:12,163 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-22 07:03:12,197 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-22 07:03:12,200 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-22 07:03:12,202 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-22 07:03:12,203 INFO L275 PluginConnector]: CDTParser initialized [2020-12-22 07:03:12,204 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/id2_i5_o5-1.c [2020-12-22 07:03:12,301 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dbc813b00/0da2a3fb21954682b33bdce32e47234d/FLAG8b52f8f15 [2020-12-22 07:03:12,926 INFO L306 CDTParser]: Found 1 translation units. [2020-12-22 07:03:12,926 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id2_i5_o5-1.c [2020-12-22 07:03:12,935 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dbc813b00/0da2a3fb21954682b33bdce32e47234d/FLAG8b52f8f15 [2020-12-22 07:03:13,262 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dbc813b00/0da2a3fb21954682b33bdce32e47234d [2020-12-22 07:03:13,265 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-22 07:03:13,268 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-22 07:03:13,273 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-22 07:03:13,273 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-22 07:03:13,277 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-22 07:03:13,279 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 07:03:13" (1/1) ... [2020-12-22 07:03:13,281 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@51a71dd6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:13, skipping insertion in model container [2020-12-22 07:03:13,281 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 07:03:13" (1/1) ... [2020-12-22 07:03:13,294 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-22 07:03:13,316 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-22 07:03:13,489 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id2_i5_o5-1.c[548,561] [2020-12-22 07:03:13,494 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 07:03:13,506 INFO L203 MainTranslator]: Completed pre-run [2020-12-22 07:03:13,525 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id2_i5_o5-1.c[548,561] [2020-12-22 07:03:13,525 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 07:03:13,544 INFO L208 MainTranslator]: Completed translation [2020-12-22 07:03:13,544 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:13 WrapperNode [2020-12-22 07:03:13,545 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-22 07:03:13,546 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-22 07:03:13,546 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-22 07:03:13,546 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-22 07:03:13,556 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:13" (1/1) ... [2020-12-22 07:03:13,567 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:13" (1/1) ... [2020-12-22 07:03:13,588 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-22 07:03:13,589 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-22 07:03:13,589 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-22 07:03:13,589 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-22 07:03:13,600 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:13" (1/1) ... [2020-12-22 07:03:13,601 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:13" (1/1) ... [2020-12-22 07:03:13,602 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:13" (1/1) ... [2020-12-22 07:03:13,603 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:13" (1/1) ... [2020-12-22 07:03:13,607 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:13" (1/1) ... [2020-12-22 07:03:13,609 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:13" (1/1) ... [2020-12-22 07:03:13,610 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:13" (1/1) ... [2020-12-22 07:03:13,612 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-22 07:03:13,614 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-22 07:03:13,614 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-22 07:03:13,614 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-22 07:03:13,615 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:13" (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 [2020-12-22 07:03:13,746 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-22 07:03:13,747 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-22 07:03:13,748 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-12-22 07:03:13,748 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-12-22 07:03:13,748 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-22 07:03:13,749 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-22 07:03:13,749 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-12-22 07:03:13,750 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-12-22 07:03:14,192 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-22 07:03:14,193 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2020-12-22 07:03:14,195 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 07:03:14 BoogieIcfgContainer [2020-12-22 07:03:14,198 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-22 07:03:14,200 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-22 07:03:14,201 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-22 07:03:14,211 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-22 07:03:14,211 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 07:03:13" (1/3) ... [2020-12-22 07:03:14,215 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@88226f6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 07:03:14, skipping insertion in model container [2020-12-22 07:03:14,216 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:13" (2/3) ... [2020-12-22 07:03:14,216 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@88226f6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 07:03:14, skipping insertion in model container [2020-12-22 07:03:14,217 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 07:03:14" (3/3) ... [2020-12-22 07:03:14,219 INFO L111 eAbstractionObserver]: Analyzing ICFG id2_i5_o5-1.c [2020-12-22 07:03:14,239 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-22 07:03:14,244 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-22 07:03:14,267 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-22 07:03:14,297 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-22 07:03:14,298 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-22 07:03:14,298 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-22 07:03:14,298 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-22 07:03:14,298 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-22 07:03:14,298 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-22 07:03:14,299 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-22 07:03:14,299 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-22 07:03:14,319 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-12-22 07:03:14,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-22 07:03:14,327 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:14,328 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:03:14,328 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:14,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:14,336 INFO L82 PathProgramCache]: Analyzing trace with hash -214835512, now seen corresponding path program 1 times [2020-12-22 07:03:14,349 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:14,350 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1011621036] [2020-12-22 07:03:14,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:14,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:14,578 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:14,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:14,650 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:03:14,655 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1011621036] [2020-12-22 07:03:14,657 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:03:14,657 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-22 07:03:14,658 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1146221736] [2020-12-22 07:03:14,665 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-22 07:03:14,665 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:14,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-22 07:03:14,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:03:14,692 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 5 states. [2020-12-22 07:03:14,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:14,776 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-12-22 07:03:14,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-22 07:03:14,778 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-12-22 07:03:14,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:14,788 INFO L225 Difference]: With dead ends: 34 [2020-12-22 07:03:14,788 INFO L226 Difference]: Without dead ends: 21 [2020-12-22 07:03:14,792 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:03:14,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-12-22 07:03:14,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-12-22 07:03:14,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-12-22 07:03:14,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-12-22 07:03:14,841 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 10 [2020-12-22 07:03:14,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:14,842 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-12-22 07:03:14,842 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-22 07:03:14,842 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-12-22 07:03:14,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-22 07:03:14,844 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:14,844 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:03:14,845 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-22 07:03:14,845 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:14,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:14,846 INFO L82 PathProgramCache]: Analyzing trace with hash 1901198062, now seen corresponding path program 1 times [2020-12-22 07:03:14,846 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:14,847 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404459928] [2020-12-22 07:03:14,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:14,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:14,895 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:14,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:14,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:14,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:14,960 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:03:14,961 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404459928] [2020-12-22 07:03:14,961 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:03:14,961 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-12-22 07:03:14,962 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896817521] [2020-12-22 07:03:14,963 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-22 07:03:14,964 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:14,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-22 07:03:14,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-12-22 07:03:14,965 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 7 states. [2020-12-22 07:03:15,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:15,060 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-12-22 07:03:15,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-22 07:03:15,060 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-12-22 07:03:15,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:15,062 INFO L225 Difference]: With dead ends: 30 [2020-12-22 07:03:15,062 INFO L226 Difference]: Without dead ends: 26 [2020-12-22 07:03:15,063 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-12-22 07:03:15,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-12-22 07:03:15,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2020-12-22 07:03:15,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-22 07:03:15,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-12-22 07:03:15,072 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 16 [2020-12-22 07:03:15,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:15,072 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-12-22 07:03:15,072 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-22 07:03:15,073 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-12-22 07:03:15,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-12-22 07:03:15,074 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:15,074 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] [2020-12-22 07:03:15,074 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-22 07:03:15,075 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:15,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:15,076 INFO L82 PathProgramCache]: Analyzing trace with hash 1593669520, now seen corresponding path program 1 times [2020-12-22 07:03:15,076 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:15,076 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349118345] [2020-12-22 07:03:15,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:15,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:15,158 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:15,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:15,192 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:15,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:15,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:15,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:15,249 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-22 07:03:15,250 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349118345] [2020-12-22 07:03:15,250 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1700065767] [2020-12-22 07:03:15,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 07:03:15,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:15,305 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-22 07:03:15,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 07:03:15,573 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-22 07:03:15,574 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 07:03:15,574 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2020-12-22 07:03:15,574 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842991568] [2020-12-22 07:03:15,575 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-22 07:03:15,575 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:15,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-22 07:03:15,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2020-12-22 07:03:15,576 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 11 states. [2020-12-22 07:03:15,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:15,671 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-12-22 07:03:15,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-22 07:03:15,672 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2020-12-22 07:03:15,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:15,673 INFO L225 Difference]: With dead ends: 36 [2020-12-22 07:03:15,674 INFO L226 Difference]: Without dead ends: 32 [2020-12-22 07:03:15,674 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2020-12-22 07:03:15,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-12-22 07:03:15,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 27. [2020-12-22 07:03:15,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-12-22 07:03:15,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2020-12-22 07:03:15,686 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 22 [2020-12-22 07:03:15,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:15,686 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2020-12-22 07:03:15,686 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-22 07:03:15,687 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2020-12-22 07:03:15,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-12-22 07:03:15,688 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:15,688 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:03:15,902 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-12-22 07:03:15,903 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:15,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:15,905 INFO L82 PathProgramCache]: Analyzing trace with hash 545848374, now seen corresponding path program 1 times [2020-12-22 07:03:15,905 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:15,906 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [140562776] [2020-12-22 07:03:15,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:15,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:15,967 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:15,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:16,001 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:16,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:16,035 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:16,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:16,057 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:16,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:16,078 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-12-22 07:03:16,078 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [140562776] [2020-12-22 07:03:16,078 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1946466824] [2020-12-22 07:03:16,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 07:03:16,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:16,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-22 07:03:16,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 07:03:16,255 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-12-22 07:03:16,255 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 07:03:16,256 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-12-22 07:03:16,256 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167764263] [2020-12-22 07:03:16,257 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-22 07:03:16,257 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:16,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-22 07:03:16,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-12-22 07:03:16,258 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 12 states. [2020-12-22 07:03:16,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:16,376 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-12-22 07:03:16,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-22 07:03:16,377 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 28 [2020-12-22 07:03:16,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:16,378 INFO L225 Difference]: With dead ends: 42 [2020-12-22 07:03:16,379 INFO L226 Difference]: Without dead ends: 38 [2020-12-22 07:03:16,380 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2020-12-22 07:03:16,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-12-22 07:03:16,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 30. [2020-12-22 07:03:16,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-12-22 07:03:16,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-12-22 07:03:16,387 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 28 [2020-12-22 07:03:16,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:16,388 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-12-22 07:03:16,388 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-22 07:03:16,388 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-12-22 07:03:16,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-12-22 07:03:16,389 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:16,390 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:03:16,598 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 07:03:16,599 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:16,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:16,600 INFO L82 PathProgramCache]: Analyzing trace with hash 120771672, now seen corresponding path program 2 times [2020-12-22 07:03:16,601 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:16,601 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [302480466] [2020-12-22 07:03:16,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:16,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:16,707 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:16,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:16,739 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:16,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:16,771 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:16,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:16,793 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:16,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:16,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:16,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:16,837 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-22 07:03:16,839 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [302480466] [2020-12-22 07:03:16,839 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2096457509] [2020-12-22 07:03:16,839 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 07:03:16,893 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-22 07:03:16,893 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 07:03:16,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-22 07:03:16,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 07:03:17,020 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-22 07:03:17,020 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 07:03:17,020 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 13 [2020-12-22 07:03:17,021 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975192092] [2020-12-22 07:03:17,021 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-22 07:03:17,022 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:17,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-22 07:03:17,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-12-22 07:03:17,023 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 13 states. [2020-12-22 07:03:17,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:17,130 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-12-22 07:03:17,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-22 07:03:17,131 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-12-22 07:03:17,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:17,132 INFO L225 Difference]: With dead ends: 48 [2020-12-22 07:03:17,132 INFO L226 Difference]: Without dead ends: 44 [2020-12-22 07:03:17,133 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-12-22 07:03:17,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-12-22 07:03:17,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 33. [2020-12-22 07:03:17,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-12-22 07:03:17,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2020-12-22 07:03:17,141 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 34 [2020-12-22 07:03:17,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:17,141 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2020-12-22 07:03:17,141 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-22 07:03:17,141 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2020-12-22 07:03:17,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-12-22 07:03:17,143 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:17,143 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:03:17,356 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 07:03:17,357 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:17,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:17,358 INFO L82 PathProgramCache]: Analyzing trace with hash -644488834, now seen corresponding path program 2 times [2020-12-22 07:03:17,358 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:17,359 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [15565708] [2020-12-22 07:03:17,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:17,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-22 07:03:17,378 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-22 07:03:17,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-22 07:03:17,394 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-22 07:03:17,419 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-22 07:03:17,419 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-22 07:03:17,420 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-12-22 07:03:17,466 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.12 07:03:17 BoogieIcfgContainer [2020-12-22 07:03:17,467 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-22 07:03:17,467 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-22 07:03:17,467 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-22 07:03:17,468 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-22 07:03:17,468 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 07:03:14" (3/4) ... [2020-12-22 07:03:17,471 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-22 07:03:17,542 INFO L141 WitnessManager]: Wrote witness to /storage/repos/svcomp/c/recursive-simple/id2_i5_o5-1.c-witness.graphml [2020-12-22 07:03:17,543 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-22 07:03:17,545 INFO L168 Benchmark]: Toolchain (without parser) took 4276.48 ms. Allocated memory was 159.4 MB in the beginning and 191.9 MB in the end (delta: 32.5 MB). Free memory was 135.4 MB in the beginning and 88.8 MB in the end (delta: 46.6 MB). Peak memory consumption was 80.6 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:17,546 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 159.4 MB. Free memory is still 135.9 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-12-22 07:03:17,547 INFO L168 Benchmark]: CACSL2BoogieTranslator took 272.26 ms. Allocated memory is still 159.4 MB. Free memory was 135.1 MB in the beginning and 125.7 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:17,547 INFO L168 Benchmark]: Boogie Procedure Inliner took 42.22 ms. Allocated memory is still 159.4 MB. Free memory was 125.7 MB in the beginning and 124.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:17,548 INFO L168 Benchmark]: Boogie Preprocessor took 23.56 ms. Allocated memory is still 159.4 MB. Free memory was 124.3 MB in the beginning and 123.4 MB in the end (delta: 924.9 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:17,549 INFO L168 Benchmark]: RCFGBuilder took 584.80 ms. Allocated memory is still 159.4 MB. Free memory was 123.4 MB in the beginning and 111.0 MB in the end (delta: 12.4 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:17,549 INFO L168 Benchmark]: TraceAbstraction took 3266.43 ms. Allocated memory was 159.4 MB in the beginning and 191.9 MB in the end (delta: 32.5 MB). Free memory was 110.6 MB in the beginning and 92.0 MB in the end (delta: 18.7 MB). Peak memory consumption was 52.3 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:17,550 INFO L168 Benchmark]: Witness Printer took 75.55 ms. Allocated memory is still 191.9 MB. Free memory was 92.0 MB in the beginning and 88.8 MB in the end (delta: 3.1 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:17,554 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 159.4 MB. Free memory is still 135.9 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 272.26 ms. Allocated memory is still 159.4 MB. Free memory was 135.1 MB in the beginning and 125.7 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 42.22 ms. Allocated memory is still 159.4 MB. Free memory was 125.7 MB in the beginning and 124.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 23.56 ms. Allocated memory is still 159.4 MB. Free memory was 124.3 MB in the beginning and 123.4 MB in the end (delta: 924.9 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 584.80 ms. Allocated memory is still 159.4 MB. Free memory was 123.4 MB in the beginning and 111.0 MB in the end (delta: 12.4 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 3266.43 ms. Allocated memory was 159.4 MB in the beginning and 191.9 MB in the end (delta: 32.5 MB). Free memory was 110.6 MB in the beginning and 92.0 MB in the end (delta: 18.7 MB). Peak memory consumption was 52.3 MB. Max. memory is 8.0 GB. * Witness Printer took 75.55 ms. Allocated memory is still 191.9 MB. Free memory was 92.0 MB in the beginning and 88.8 MB in the end (delta: 3.1 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 23]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L20] int input = 5; [L21] CALL, EXPR id(input) VAL [\old(x)=5] [L10] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=4] [L15] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L16] CALL, EXPR id(x-1) VAL [\old(x)=3] [L10] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=2] [L15] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L16] CALL, EXPR id(x-1) VAL [\old(x)=1] [L10] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=0] [L15] COND TRUE x==0 [L15] return 0; VAL [\old(x)=0, \result=0, x=0] [L11] RET, EXPR id2(x-1) VAL [\old(x)=1, id2(x-1)=0, x=1] [L11] return id2(x-1) + 1; [L16] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L16] return id(x-1) + 1; [L11] RET, EXPR id2(x-1) VAL [\old(x)=3, id2(x-1)=2, x=3] [L11] return id2(x-1) + 1; [L16] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L16] return id(x-1) + 1; [L11] RET, EXPR id2(x-1) VAL [\old(x)=5, id2(x-1)=4, x=5] [L11] return id2(x-1) + 1; [L21] RET, EXPR id(input) [L21] int result = id(input); [L22] COND TRUE result == 5 [L23] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 22 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.1s, OverallIterations: 6, TraceHistogramMax: 3, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 78 SDtfs, 89 SDslu, 331 SDs, 0 SdLazy, 219 SolverSat, 20 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 156 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=33occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 26 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.2s InterpolantComputationTime, 234 NumberOfCodeBlocks, 234 NumberOfCodeBlocksAsserted, 10 NumberOfCheckSat, 186 ConstructedInterpolants, 0 QuantifiedInterpolants, 11562 SizeOfPredicates, 15 NumberOfNonLiveVariables, 285 ConjunctsInSsa, 30 ConjunctsInUnsatCore, 8 InterpolantComputations, 2 PerfectInterpolantSequences, 34/68 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...