/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 NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_o20.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 11:15:36,567 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:15:36,570 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:15:36,591 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 11:15:36,592 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:15:36,594 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:15:36,597 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:15:36,609 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:15:36,613 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:15:36,618 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:15:36,620 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:15:36,622 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:15:36,622 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:15:36,624 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:15:36,627 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:15:36,628 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:15:36,630 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:15:36,631 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:15:36,633 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:15:36,639 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:15:36,646 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:15:36,650 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:15:36,651 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:15:36,652 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:15:36,655 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 11:15:36,666 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:15:36,668 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:15:36,669 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:15:36,670 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 [2020-07-20 11:15:36,699 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:15:36,700 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:15:36,703 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:15:36,703 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:15:36,703 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:15:36,703 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:15:36,704 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:15:36,704 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:15:36,704 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:15:36,704 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:15:36,705 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:15:36,706 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:15:36,706 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:15:36,706 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:15:36,707 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:15:36,707 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:15:36,707 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:15:36,707 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:15:36,707 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:15:36,709 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:15:36,709 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:15:36,711 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:15:36,711 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:15:36,713 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:15:36,713 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:15:36,714 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:15:36,714 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:15:36,714 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:15:36,714 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:15:36,714 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 -> NOT_INCREMENTALLY [2020-07-20 11:15:36,989 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:15:37,009 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:15:37,013 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:15:37,014 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:15:37,015 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:15:37,016 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o20.c [2020-07-20 11:15:37,098 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/38efe2afe/3835c4182ab5454983ee735c82dae329/FLAG9eb717c89 [2020-07-20 11:15:37,592 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:15:37,592 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_o20.c [2020-07-20 11:15:37,598 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/38efe2afe/3835c4182ab5454983ee735c82dae329/FLAG9eb717c89 [2020-07-20 11:15:38,048 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/38efe2afe/3835c4182ab5454983ee735c82dae329 [2020-07-20 11:15:38,060 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:15:38,064 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:15:38,065 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:15:38,065 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:15:38,069 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:15:38,070 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:15:38" (1/1) ... [2020-07-20 11:15:38,072 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@16d5b002 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:38, skipping insertion in model container [2020-07-20 11:15:38,073 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:15:38" (1/1) ... [2020-07-20 11:15:38,081 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:15:38,104 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:15:38,326 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:15:38,332 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:15:38,352 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:15:38,368 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:15:38,369 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:38 WrapperNode [2020-07-20 11:15:38,369 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:15:38,370 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:15:38,370 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:15:38,370 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:15:38,384 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:38" (1/1) ... [2020-07-20 11:15:38,387 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:38" (1/1) ... [2020-07-20 11:15:38,399 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:38" (1/1) ... [2020-07-20 11:15:38,399 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:38" (1/1) ... [2020-07-20 11:15:38,480 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:38" (1/1) ... [2020-07-20 11:15:38,482 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:38" (1/1) ... [2020-07-20 11:15:38,483 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:38" (1/1) ... [2020-07-20 11:15:38,484 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:15:38,485 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:15:38,485 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:15:38,485 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:15:38,487 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:38" (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 [2020-07-20 11:15:38,545 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:15:38,545 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:15:38,545 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-20 11:15:38,546 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:15:38,546 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-20 11:15:38,546 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:15:38,546 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-20 11:15:38,546 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:15:38,546 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:15:38,546 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:15:38,703 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:15:38,704 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 11:15:38,708 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:15:38 BoogieIcfgContainer [2020-07-20 11:15:38,708 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:15:38,709 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:15:38,709 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:15:38,713 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:15:38,713 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:15:38" (1/3) ... [2020-07-20 11:15:38,714 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34eba567 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:15:38, skipping insertion in model container [2020-07-20 11:15:38,714 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:38" (2/3) ... [2020-07-20 11:15:38,715 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34eba567 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:15:38, skipping insertion in model container [2020-07-20 11:15:38,715 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:15:38" (3/3) ... [2020-07-20 11:15:38,717 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o20.c [2020-07-20 11:15:38,727 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:15:38,735 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:15:38,749 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:15:38,773 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:15:38,773 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:15:38,774 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:15:38,774 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:15:38,774 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:15:38,774 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:15:38,774 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:15:38,774 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:15:38,793 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-20 11:15:38,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 11:15:38,800 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:15:38,801 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:15:38,801 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:15:38,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:15:38,807 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-20 11:15:38,813 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:15:38,814 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1081575029] [2020-07-20 11:15:38,814 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 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 [2020-07-20 11:15:38,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:15:38,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 11:15:38,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:15:38,955 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:15:38,956 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:15:38,957 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1081575029] [2020-07-20 11:15:38,958 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:15:38,959 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:15:38,960 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716305198] [2020-07-20 11:15:38,966 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:15:38,966 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:15:38,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:15:38,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:15:38,987 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-20 11:15:39,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:15:39,080 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-07-20 11:15:39,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:15:39,082 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 11:15:39,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:15:39,098 INFO L225 Difference]: With dead ends: 32 [2020-07-20 11:15:39,099 INFO L226 Difference]: Without dead ends: 18 [2020-07-20 11:15:39,103 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 [2020-07-20 11:15:39,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-20 11:15:39,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-20 11:15:39,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 11:15:39,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-20 11:15:39,148 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-20 11:15:39,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:15:39,149 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-20 11:15:39,149 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:15:39,149 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-20 11:15:39,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 11:15:39,151 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:15:39,152 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:15:39,366 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:15:39,366 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:15:39,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:15:39,367 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-20 11:15:39,367 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:15:39,368 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1809094088] [2020-07-20 11:15:39,369 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 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 [2020-07-20 11:15:39,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:15:39,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 11:15:39,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:15:39,463 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 11:15:39,463 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:15:39,682 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 11:15:39,683 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1809094088] [2020-07-20 11:15:39,683 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:15:39,684 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 11:15:39,684 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1704240068] [2020-07-20 11:15:39,686 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 11:15:39,686 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:15:39,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 11:15:39,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-20 11:15:39,687 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states. [2020-07-20 11:15:39,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:15:39,740 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-07-20 11:15:39,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:15:39,741 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-07-20 11:15:39,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:15:39,743 INFO L225 Difference]: With dead ends: 30 [2020-07-20 11:15:39,743 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 11:15:39,744 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 [2020-07-20 11:15:39,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 11:15:39,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-20 11:15:39,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-20 11:15:39,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-20 11:15:39,752 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2020-07-20 11:15:39,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:15:39,752 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-20 11:15:39,752 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 11:15:39,752 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-20 11:15:39,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 11:15:39,754 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:15:39,754 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:15:39,967 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:15:39,968 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:15:39,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:15:39,970 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 2 times [2020-07-20 11:15:39,970 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:15:39,971 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [520373839] [2020-07-20 11:15:39,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-07-20 11:15:40,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:15:40,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 11:15:40,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:15:40,109 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 11:15:40,109 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:15:40,553 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 11:15:40,554 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [520373839] [2020-07-20 11:15:40,554 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:15:40,555 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-07-20 11:15:40,555 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104401064] [2020-07-20 11:15:40,556 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 11:15:40,556 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:15:40,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 11:15:40,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2020-07-20 11:15:40,557 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 20 states. [2020-07-20 11:15:42,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:15:42,971 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2020-07-20 11:15:42,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 11:15:42,973 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 31 [2020-07-20 11:15:42,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:15:42,974 INFO L225 Difference]: With dead ends: 42 [2020-07-20 11:15:42,975 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 11:15:42,976 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=97, Invalid=454, Unknown=1, NotChecked=0, Total=552 [2020-07-20 11:15:42,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 11:15:42,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-20 11:15:42,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 11:15:42,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-20 11:15:42,984 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 31 [2020-07-20 11:15:42,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:15:42,985 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-20 11:15:42,985 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 11:15:42,985 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-20 11:15:42,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-20 11:15:42,987 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:15:42,987 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:15:43,188 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:15:43,190 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:15:43,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:15:43,191 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 3 times [2020-07-20 11:15:43,192 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:15:43,193 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1440073757] [2020-07-20 11:15:43,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-07-20 11:15:43,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:15:43,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-20 11:15:43,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:15:43,483 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-20 11:15:43,483 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:15:47,043 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 76 refuted. 1 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-20 11:15:47,044 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1440073757] [2020-07-20 11:15:47,044 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:15:47,044 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 36 [2020-07-20 11:15:47,045 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144421774] [2020-07-20 11:15:47,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-20 11:15:47,046 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:15:47,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-20 11:15:47,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1075, Unknown=1, NotChecked=0, Total=1260 [2020-07-20 11:15:47,047 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 36 states. [2020-07-20 11:15:52,885 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 11 [2020-07-20 11:16:02,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:16:02,606 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2020-07-20 11:16:02,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-20 11:16:02,608 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 55 [2020-07-20 11:16:02,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:16:02,611 INFO L225 Difference]: With dead ends: 66 [2020-07-20 11:16:02,611 INFO L226 Difference]: Without dead ends: 60 [2020-07-20 11:16:02,613 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 18.3s TimeCoverageRelationStatistics Valid=381, Invalid=1871, Unknown=4, NotChecked=0, Total=2256 [2020-07-20 11:16:02,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-20 11:16:02,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-07-20 11:16:02,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 11:16:02,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-07-20 11:16:02,624 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 55 [2020-07-20 11:16:02,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:16:02,625 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-07-20 11:16:02,625 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-20 11:16:02,625 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-07-20 11:16:02,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-07-20 11:16:02,629 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:16:02,629 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:16:02,830 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:02,831 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:16:02,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:16:02,832 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 4 times [2020-07-20 11:16:02,832 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:16:02,833 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1908021591] [2020-07-20 11:16:02,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-07-20 11:16:02,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:16:02,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-20 11:16:02,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:16:03,642 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-20 11:16:03,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:16:21,144 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 342 refuted. 3 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-20 11:16:21,144 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1908021591] [2020-07-20 11:16:21,144 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:16:21,145 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 68 [2020-07-20 11:16:21,145 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [714387554] [2020-07-20 11:16:21,146 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-20 11:16:21,146 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:16:21,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-20 11:16:21,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=495, Invalid=4055, Unknown=6, NotChecked=0, Total=4556 [2020-07-20 11:16:21,149 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 68 states. [2020-07-20 11:16:29,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:16:29,298 INFO L93 Difference]: Finished difference Result 81 states and 86 transitions. [2020-07-20 11:16:29,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-07-20 11:16:29,302 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 103 [2020-07-20 11:16:29,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:16:29,304 INFO L225 Difference]: With dead ends: 81 [2020-07-20 11:16:29,304 INFO L226 Difference]: Without dead ends: 75 [2020-07-20 11:16:29,307 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 523 ImplicationChecksByTransitivity, 21.3s TimeCoverageRelationStatistics Valid=624, Invalid=4770, Unknown=8, NotChecked=0, Total=5402 [2020-07-20 11:16:29,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-07-20 11:16:29,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2020-07-20 11:16:29,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-07-20 11:16:29,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2020-07-20 11:16:29,320 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 103 [2020-07-20 11:16:29,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:16:29,320 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2020-07-20 11:16:29,321 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-20 11:16:29,321 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2020-07-20 11:16:29,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-20 11:16:29,329 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:16:29,329 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:16:29,529 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:29,530 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:16:29,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:16:29,531 INFO L82 PathProgramCache]: Analyzing trace with hash -799288067, now seen corresponding path program 5 times [2020-07-20 11:16:29,532 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:16:29,536 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2056188641] [2020-07-20 11:16:29,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:29,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 11:16:29,599 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 11:16:29,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 11:16:29,833 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 11:16:29,867 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 11:16:29,867 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 11:16:30,081 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:30,130 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 11:16:30 BoogieIcfgContainer [2020-07-20 11:16:30,130 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 11:16:30,133 INFO L168 Benchmark]: Toolchain (without parser) took 52070.01 ms. Allocated memory was 139.5 MB in the beginning and 298.3 MB in the end (delta: 158.9 MB). Free memory was 102.7 MB in the beginning and 140.8 MB in the end (delta: -38.2 MB). Peak memory consumption was 120.7 MB. Max. memory is 7.1 GB. [2020-07-20 11:16:30,135 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 139.5 MB. Free memory was 121.3 MB in the beginning and 121.1 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 11:16:30,136 INFO L168 Benchmark]: CACSL2BoogieTranslator took 305.08 ms. Allocated memory is still 139.5 MB. Free memory was 102.2 MB in the beginning and 93.0 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-07-20 11:16:30,138 INFO L168 Benchmark]: Boogie Preprocessor took 114.51 ms. Allocated memory was 139.5 MB in the beginning and 202.4 MB in the end (delta: 62.9 MB). Free memory was 93.0 MB in the beginning and 181.7 MB in the end (delta: -88.7 MB). Peak memory consumption was 14.4 MB. Max. memory is 7.1 GB. [2020-07-20 11:16:30,138 INFO L168 Benchmark]: RCFGBuilder took 222.94 ms. Allocated memory is still 202.4 MB. Free memory was 181.7 MB in the beginning and 170.8 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. [2020-07-20 11:16:30,141 INFO L168 Benchmark]: TraceAbstraction took 51420.90 ms. Allocated memory was 202.4 MB in the beginning and 298.3 MB in the end (delta: 95.9 MB). Free memory was 170.2 MB in the beginning and 140.8 MB in the end (delta: 29.3 MB). Peak memory consumption was 125.3 MB. Max. memory is 7.1 GB. [2020-07-20 11:16:30,145 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 139.5 MB. Free memory was 121.3 MB in the beginning and 121.1 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 305.08 ms. Allocated memory is still 139.5 MB. Free memory was 102.2 MB in the beginning and 93.0 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 114.51 ms. Allocated memory was 139.5 MB in the beginning and 202.4 MB in the end (delta: 62.9 MB). Free memory was 93.0 MB in the beginning and 181.7 MB in the end (delta: -88.7 MB). Peak memory consumption was 14.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 222.94 ms. Allocated memory is still 202.4 MB. Free memory was 181.7 MB in the beginning and 170.8 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 51420.90 ms. Allocated memory was 202.4 MB in the beginning and 298.3 MB in the end (delta: 95.9 MB). Free memory was 170.2 MB in the beginning and 140.8 MB in the end (delta: 29.3 MB). Peak memory consumption was 125.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] unsigned int input = __VERIFIER_nondet_uint(); [L11] CALL, EXPR id(input) VAL [\old(x)=20] [L5] COND FALSE !(x==0) VAL [\old(x)=20, x=20] [L6] CALL, EXPR id(x-1) VAL [\old(x)=19] [L5] COND FALSE !(x==0) VAL [\old(x)=19, x=19] [L6] CALL, EXPR id(x-1) VAL [\old(x)=18] [L5] COND FALSE !(x==0) VAL [\old(x)=18, x=18] [L6] CALL, EXPR id(x-1) VAL [\old(x)=17] [L5] COND FALSE !(x==0) VAL [\old(x)=17, x=17] [L6] CALL, EXPR id(x-1) VAL [\old(x)=16] [L5] COND FALSE !(x==0) VAL [\old(x)=16, x=16] [L6] CALL, EXPR id(x-1) VAL [\old(x)=15] [L5] COND FALSE !(x==0) VAL [\old(x)=15, x=15] [L6] CALL, EXPR id(x-1) VAL [\old(x)=14] [L5] COND FALSE !(x==0) VAL [\old(x)=14, x=14] [L6] CALL, EXPR id(x-1) VAL [\old(x)=13] [L5] COND FALSE !(x==0) VAL [\old(x)=13, x=13] [L6] CALL, EXPR id(x-1) VAL [\old(x)=12] [L5] COND FALSE !(x==0) VAL [\old(x)=12, x=12] [L6] CALL, EXPR id(x-1) VAL [\old(x)=11] [L5] COND FALSE !(x==0) VAL [\old(x)=11, x=11] [L6] CALL, EXPR id(x-1) VAL [\old(x)=10] [L5] COND FALSE !(x==0) VAL [\old(x)=10, x=10] [L6] CALL, EXPR id(x-1) VAL [\old(x)=9] [L5] COND FALSE !(x==0) VAL [\old(x)=9, x=9] [L6] CALL, EXPR id(x-1) VAL [\old(x)=8] [L5] COND FALSE !(x==0) VAL [\old(x)=8, x=8] [L6] CALL, EXPR id(x-1) VAL [\old(x)=7] [L5] COND FALSE !(x==0) VAL [\old(x)=7, x=7] [L6] CALL, EXPR id(x-1) VAL [\old(x)=6] [L5] COND FALSE !(x==0) VAL [\old(x)=6, x=6] [L6] CALL, EXPR id(x-1) VAL [\old(x)=5] [L5] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L6] CALL, EXPR id(x-1) VAL [\old(x)=4] [L5] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L6] CALL, EXPR id(x-1) VAL [\old(x)=3] [L5] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L6] CALL, EXPR id(x-1) VAL [\old(x)=2] [L5] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L6] CALL, EXPR id(x-1) VAL [\old(x)=1] [L5] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L6] CALL, EXPR id(x-1) VAL [\old(x)=0] [L5] COND TRUE x==0 [L5] return 0; VAL [\old(x)=0, \result=0, x=0] [L6] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=5, id(x-1)=4, x=5] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=6, id(x-1)=5, x=6] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=7, id(x-1)=6, x=7] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=8, id(x-1)=7, x=8] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=9, id(x-1)=8, x=9] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=10, id(x-1)=9, x=10] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=11, id(x-1)=10, x=11] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=12, id(x-1)=11, x=12] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=13, id(x-1)=12, x=13] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=14, id(x-1)=13, x=14] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=15, id(x-1)=14, x=15] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=16, id(x-1)=15, x=16] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=17, id(x-1)=16, x=17] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=18, id(x-1)=17, x=18] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=19, id(x-1)=18, x=19] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=20, id(x-1)=19, x=20] [L6] return id(x-1) + 1; [L11] RET, EXPR id(input) VAL [id(input)=20, input=20] [L11] unsigned int result = id(input); [L12] COND TRUE result == 20 VAL [input=20, result=20] [L13] __VERIFIER_error() VAL [input=20, result=20] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 51.3s, OverallIterations: 6, TraceHistogramMax: 21, AutomataDifference: 26.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 131 SDtfs, 2 SDslu, 2199 SDs, 0 SdLazy, 1098 SolverSat, 41 SolverUnsat, 1 SolverUnknown, 0 SolverNotchecked, 2.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 446 GetRequests, 293 SyntacticMatches, 0 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 720 ImplicationChecksByTransitivity, 42.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=75occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 22.9s InterpolantComputationTime, 354 NumberOfCodeBlocks, 354 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 420 ConstructedInterpolants, 0 QuantifiedInterpolants, 82608 SizeOfPredicates, 5 NumberOfNonLiveVariables, 462 ConjunctsInSsa, 139 ConjunctsInUnsatCore, 9 InterpolantComputations, 1 PerfectInterpolantSequences, 878/1756 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...