/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/id2_i5_o5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 11:13:59,251 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:13:59,255 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:13:59,275 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 11:13:59,276 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:13:59,278 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:13:59,280 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:13:59,283 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:13:59,285 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:13:59,287 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:13:59,288 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:13:59,290 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:13:59,290 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:13:59,292 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:13:59,294 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:13:59,295 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:13:59,298 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:13:59,299 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:13:59,305 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:13:59,311 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:13:59,316 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:13:59,318 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:13:59,322 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:13:59,323 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:13:59,330 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 11:13:59,354 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:13:59,355 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:13:59,357 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:13:59,359 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 11:13:59,396 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:13:59,396 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:13:59,400 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:13:59,401 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:13:59,401 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:13:59,401 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:13:59,401 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:13:59,402 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:13:59,402 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:13:59,402 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:13:59,403 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:13:59,404 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:13:59,404 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:13:59,405 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:13:59,405 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:13:59,405 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:13:59,406 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:13:59,406 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:13:59,406 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:13:59,406 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:13:59,407 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:13:59,407 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:13:59,407 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:13:59,407 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:13:59,408 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:13:59,408 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:13:59,408 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:13:59,408 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:13:59,408 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:13:59,409 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 11:13:59,770 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:13:59,788 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:13:59,795 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:13:59,797 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:13:59,798 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:13:59,800 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c [2020-07-20 11:13:59,912 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fdd51f29b/3a04c5670de64a188f9c78320f407282/FLAG326e62a81 [2020-07-20 11:14:00,599 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:14:00,600 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c [2020-07-20 11:14:00,609 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fdd51f29b/3a04c5670de64a188f9c78320f407282/FLAG326e62a81 [2020-07-20 11:14:00,927 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fdd51f29b/3a04c5670de64a188f9c78320f407282 [2020-07-20 11:14:00,941 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:14:00,944 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:14:00,946 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:14:00,946 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:14:00,951 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:14:00,953 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:14:00" (1/1) ... [2020-07-20 11:14:00,957 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2e02ab94 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:14:00, skipping insertion in model container [2020-07-20 11:14:00,958 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:14:00" (1/1) ... [2020-07-20 11:14:00,969 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:14:00,995 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:14:01,252 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:14:01,259 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:14:01,276 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:14:01,291 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:14:01,292 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:14:01 WrapperNode [2020-07-20 11:14:01,292 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:14:01,293 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:14:01,293 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:14:01,293 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:14:01,307 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:14:01" (1/1) ... [2020-07-20 11:14:01,307 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:14:01" (1/1) ... [2020-07-20 11:14:01,314 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:14:01" (1/1) ... [2020-07-20 11:14:01,314 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:14:01" (1/1) ... [2020-07-20 11:14:01,415 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:14:01" (1/1) ... [2020-07-20 11:14:01,418 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:14:01" (1/1) ... [2020-07-20 11:14:01,420 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:14:01" (1/1) ... [2020-07-20 11:14:01,422 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:14:01,423 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:14:01,423 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:14:01,424 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:14:01,425 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:14:01" (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 11:14:01,517 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:14:01,518 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:14:01,518 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-20 11:14:01,518 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-07-20 11:14:01,518 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:14:01,519 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 11:14:01,519 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:14:01,519 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-20 11:14:01,521 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-07-20 11:14:01,522 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:14:01,522 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:14:01,522 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:14:01,758 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:14:01,758 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 11:14:01,764 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:14:01 BoogieIcfgContainer [2020-07-20 11:14:01,765 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:14:01,766 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:14:01,766 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:14:01,769 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:14:01,770 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:14:00" (1/3) ... [2020-07-20 11:14:01,771 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f8c0f60 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:14:01, skipping insertion in model container [2020-07-20 11:14:01,772 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:14:01" (2/3) ... [2020-07-20 11:14:01,772 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f8c0f60 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:14:01, skipping insertion in model container [2020-07-20 11:14:01,773 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:14:01" (3/3) ... [2020-07-20 11:14:01,775 INFO L109 eAbstractionObserver]: Analyzing ICFG id2_i5_o5-1.c [2020-07-20 11:14:01,786 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:14:01,795 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:14:01,813 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:14:01,843 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:14:01,844 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:14:01,844 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:14:01,844 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:14:01,844 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:14:01,844 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:14:01,844 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:14:01,844 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:14:01,864 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2020-07-20 11:14:01,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 11:14:01,873 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:01,874 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:01,875 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:01,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:01,882 INFO L82 PathProgramCache]: Analyzing trace with hash -550894517, now seen corresponding path program 1 times [2020-07-20 11:14:01,892 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:01,892 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1316810010] [2020-07-20 11:14:01,893 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 11:14:01,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:01,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 11:14:01,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:02,171 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 11:14:02,172 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:14:02,179 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1316810010] [2020-07-20 11:14:02,181 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:14:02,183 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:14:02,184 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239141909] [2020-07-20 11:14:02,191 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:14:02,192 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:02,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:14:02,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:14:02,208 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 5 states. [2020-07-20 11:14:02,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:02,334 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2020-07-20 11:14:02,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:14:02,337 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 11:14:02,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:02,349 INFO L225 Difference]: With dead ends: 36 [2020-07-20 11:14:02,349 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 11:14:02,354 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 11:14:02,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 11:14:02,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-20 11:14:02,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-20 11:14:02,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-07-20 11:14:02,416 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 13 [2020-07-20 11:14:02,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:02,417 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-07-20 11:14:02,417 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:14:02,417 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-07-20 11:14:02,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 11:14:02,420 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:02,421 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:02,635 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:02,636 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:02,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:02,636 INFO L82 PathProgramCache]: Analyzing trace with hash 40504409, now seen corresponding path program 1 times [2020-07-20 11:14:02,637 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:02,637 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [204724827] [2020-07-20 11:14:02,637 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 11:14:02,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:02,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:14:02,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:02,770 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 11:14:02,771 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:14:02,771 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [204724827] [2020-07-20 11:14:02,771 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:14:02,772 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-20 11:14:02,772 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382664961] [2020-07-20 11:14:02,775 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 11:14:02,775 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:02,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 11:14:02,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-20 11:14:02,777 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 7 states. [2020-07-20 11:14:02,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:02,914 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2020-07-20 11:14:02,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 11:14:02,916 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2020-07-20 11:14:02,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:02,918 INFO L225 Difference]: With dead ends: 33 [2020-07-20 11:14:02,919 INFO L226 Difference]: Without dead ends: 29 [2020-07-20 11:14:02,921 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-20 11:14:02,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-20 11:14:02,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2020-07-20 11:14:02,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-20 11:14:02,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2020-07-20 11:14:02,933 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 19 [2020-07-20 11:14:02,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:02,933 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2020-07-20 11:14:02,934 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 11:14:02,934 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2020-07-20 11:14:02,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 11:14:02,936 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:02,937 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:03,151 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:03,152 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:03,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:03,153 INFO L82 PathProgramCache]: Analyzing trace with hash 1029702107, now seen corresponding path program 1 times [2020-07-20 11:14:03,154 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:03,154 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [763064350] [2020-07-20 11:14:03,154 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 11:14:03,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:03,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:14:03,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:03,325 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 11:14:03,326 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:03,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:03,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:03,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:03,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:03,838 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:14:03,838 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [763064350] [2020-07-20 11:14:03,839 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:03,839 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 11:14:03,839 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8780755] [2020-07-20 11:14:03,840 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 11:14:03,841 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:03,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 11:14:03,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 11:14:03,842 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 12 states. [2020-07-20 11:14:03,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:03,984 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2020-07-20 11:14:03,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:14:03,985 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 25 [2020-07-20 11:14:03,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:03,987 INFO L225 Difference]: With dead ends: 39 [2020-07-20 11:14:03,987 INFO L226 Difference]: Without dead ends: 35 [2020-07-20 11:14:03,988 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 33 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:14:03,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-20 11:14:03,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2020-07-20 11:14:03,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 11:14:03,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-07-20 11:14:03,997 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 25 [2020-07-20 11:14:03,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:03,998 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-07-20 11:14:03,998 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 11:14:03,998 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-07-20 11:14:04,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 11:14:04,000 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:04,000 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, 1, 1, 1] [2020-07-20 11:14:04,214 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:04,216 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:04,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:04,217 INFO L82 PathProgramCache]: Analyzing trace with hash -559715991, now seen corresponding path program 1 times [2020-07-20 11:14:04,218 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:04,218 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [955085137] [2020-07-20 11:14:04,219 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 11:14:04,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:04,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 11:14:04,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:04,353 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 11:14:04,354 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:04,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:04,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:04,941 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:04,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:05,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:05,024 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:05,069 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 11:14:05,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [955085137] [2020-07-20 11:14:05,070 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:05,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 11:14:05,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803393796] [2020-07-20 11:14:05,072 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 11:14:05,072 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:05,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 11:14:05,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:14:05,073 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 14 states. [2020-07-20 11:14:05,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:05,233 INFO L93 Difference]: Finished difference Result 45 states and 47 transitions. [2020-07-20 11:14:05,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:14:05,234 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 31 [2020-07-20 11:14:05,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:05,236 INFO L225 Difference]: With dead ends: 45 [2020-07-20 11:14:05,236 INFO L226 Difference]: Without dead ends: 41 [2020-07-20 11:14:05,238 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 41 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 11:14:05,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-07-20 11:14:05,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 33. [2020-07-20 11:14:05,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 11:14:05,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2020-07-20 11:14:05,247 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 31 [2020-07-20 11:14:05,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:05,247 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2020-07-20 11:14:05,248 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 11:14:05,248 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2020-07-20 11:14:05,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-20 11:14:05,250 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:05,250 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, 1, 1, 1] [2020-07-20 11:14:05,465 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:05,466 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:05,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:05,468 INFO L82 PathProgramCache]: Analyzing trace with hash 2003326827, now seen corresponding path program 2 times [2020-07-20 11:14:05,468 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:05,469 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [207945301] [2020-07-20 11:14:05,469 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 11:14:05,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:05,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 11:14:05,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:05,613 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-07-20 11:14:05,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:06,266 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:06,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:06,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:06,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:06,649 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 11:14:06,649 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [207945301] [2020-07-20 11:14:06,650 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:06,650 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 11:14:06,651 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [62212168] [2020-07-20 11:14:06,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 11:14:06,652 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:06,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 11:14:06,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:14:06,653 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 15 states. [2020-07-20 11:14:06,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:06,851 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-07-20 11:14:06,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:14:06,853 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-07-20 11:14:06,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:06,855 INFO L225 Difference]: With dead ends: 51 [2020-07-20 11:14:06,855 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 11:14:06,856 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 49 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 11:14:06,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 11:14:06,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 36. [2020-07-20 11:14:06,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 11:14:06,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-07-20 11:14:06,864 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 37 [2020-07-20 11:14:06,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:06,864 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-07-20 11:14:06,865 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 11:14:06,865 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-07-20 11:14:06,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-20 11:14:06,866 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:06,866 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, 1, 1, 1] [2020-07-20 11:14:07,071 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:07,072 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:07,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:07,073 INFO L82 PathProgramCache]: Analyzing trace with hash 1197899385, now seen corresponding path program 2 times [2020-07-20 11:14:07,074 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:07,074 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [675026117] [2020-07-20 11:14:07,074 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 11:14:07,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 11:14:07,118 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 11:14:07,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 11:14:07,131 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 11:14:07,153 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 11:14:07,153 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 11:14:07,366 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:07,406 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 11:14:07 BoogieIcfgContainer [2020-07-20 11:14:07,407 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 11:14:07,410 INFO L168 Benchmark]: Toolchain (without parser) took 6466.36 ms. Allocated memory was 137.9 MB in the beginning and 248.5 MB in the end (delta: 110.6 MB). Free memory was 102.4 MB in the beginning and 142.4 MB in the end (delta: -40.0 MB). Peak memory consumption was 70.6 MB. Max. memory is 7.1 GB. [2020-07-20 11:14:07,412 INFO L168 Benchmark]: CDTParser took 0.51 ms. Allocated memory is still 137.9 MB. Free memory was 119.7 MB in the beginning and 119.5 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-20 11:14:07,413 INFO L168 Benchmark]: CACSL2BoogieTranslator took 346.56 ms. Allocated memory is still 137.9 MB. Free memory was 102.0 MB in the beginning and 92.6 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-20 11:14:07,414 INFO L168 Benchmark]: Boogie Preprocessor took 129.72 ms. Allocated memory was 137.9 MB in the beginning and 202.9 MB in the end (delta: 65.0 MB). Free memory was 92.6 MB in the beginning and 182.2 MB in the end (delta: -89.5 MB). Peak memory consumption was 14.6 MB. Max. memory is 7.1 GB. [2020-07-20 11:14:07,415 INFO L168 Benchmark]: RCFGBuilder took 341.73 ms. Allocated memory is still 202.9 MB. Free memory was 182.2 MB in the beginning and 170.1 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.1 MB. Max. memory is 7.1 GB. [2020-07-20 11:14:07,416 INFO L168 Benchmark]: TraceAbstraction took 5640.92 ms. Allocated memory was 202.9 MB in the beginning and 248.5 MB in the end (delta: 45.6 MB). Free memory was 169.4 MB in the beginning and 142.4 MB in the end (delta: 27.0 MB). Peak memory consumption was 72.6 MB. Max. memory is 7.1 GB. [2020-07-20 11:14:07,421 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.51 ms. Allocated memory is still 137.9 MB. Free memory was 119.7 MB in the beginning and 119.5 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 346.56 ms. Allocated memory is still 137.9 MB. Free memory was 102.0 MB in the beginning and 92.6 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 129.72 ms. Allocated memory was 137.9 MB in the beginning and 202.9 MB in the end (delta: 65.0 MB). Free memory was 92.6 MB in the beginning and 182.2 MB in the end (delta: -89.5 MB). Peak memory consumption was 14.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 341.73 ms. Allocated memory is still 202.9 MB. Free memory was 182.2 MB in the beginning and 170.1 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 5640.92 ms. Allocated memory was 202.9 MB in the beginning and 248.5 MB in the end (delta: 45.6 MB). Free memory was 169.4 MB in the beginning and 142.4 MB in the end (delta: 27.0 MB). Peak memory consumption was 72.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 21]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L18] int input = 5; VAL [input=5] [L19] CALL, EXPR id(input) VAL [\old(x)=5] [L8] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L9] CALL, EXPR id2(x-1) VAL [\old(x)=4] [L13] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L14] CALL, EXPR id(x-1) VAL [\old(x)=3] [L8] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L9] CALL, EXPR id2(x-1) VAL [\old(x)=2] [L13] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L14] CALL, EXPR id(x-1) VAL [\old(x)=1] [L8] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L9] CALL, EXPR id2(x-1) VAL [\old(x)=0] [L13] COND TRUE x==0 [L13] return 0; VAL [\old(x)=0, \result=0, x=0] [L9] RET, EXPR id2(x-1) VAL [\old(x)=1, id2(x-1)=0, x=1] [L9] return id2(x-1) + 1; [L14] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L14] return id(x-1) + 1; [L9] RET, EXPR id2(x-1) VAL [\old(x)=3, id2(x-1)=2, x=3] [L9] return id2(x-1) + 1; [L14] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L14] return id(x-1) + 1; [L9] RET, EXPR id2(x-1) VAL [\old(x)=5, id2(x-1)=4, x=5] [L9] return id2(x-1) + 1; [L19] RET, EXPR id(input) VAL [id(input)=5, input=5] [L19] int result = id(input); [L20] COND TRUE result == 5 VAL [input=5, result=5] [L21] __VERIFIER_error() VAL [input=5, result=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 26 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 5.5s, OverallIterations: 6, TraceHistogramMax: 3, AutomataDifference: 0.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 92 SDtfs, 112 SDslu, 458 SDs, 0 SdLazy, 254 SolverSat, 26 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 228 GetRequests, 145 SyntacticMatches, 25 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 1.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=36occurred 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, 0.0s SatisfiabilityAnalysisTime, 2.9s InterpolantComputationTime, 168 NumberOfCodeBlocks, 168 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 210 ConstructedInterpolants, 0 QuantifiedInterpolants, 16128 SizeOfPredicates, 20 NumberOfNonLiveVariables, 300 ConjunctsInSsa, 40 ConjunctsInUnsatCore, 8 InterpolantComputations, 2 PerfectInterpolantSequences, 24/68 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...