./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive-simple/fibo_5-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5fbdf5bf Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/recursive-simple/fibo_5-2.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 063966206f80cef10873a8e49ae0985aad7f65cb ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.1-wip.dd.seqcomp-5fbdf5b [2021-08-29 16:31:52,638 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-08-29 16:31:52,640 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-08-29 16:31:52,669 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-08-29 16:31:52,670 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-08-29 16:31:52,673 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-08-29 16:31:52,674 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-08-29 16:31:52,677 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-08-29 16:31:52,685 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-08-29 16:31:52,689 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-08-29 16:31:52,690 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-08-29 16:31:52,691 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-08-29 16:31:52,691 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-08-29 16:31:52,693 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-08-29 16:31:52,694 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-08-29 16:31:52,702 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-08-29 16:31:52,703 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-08-29 16:31:52,704 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-08-29 16:31:52,705 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-08-29 16:31:52,709 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-08-29 16:31:52,710 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-08-29 16:31:52,711 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-08-29 16:31:52,712 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-08-29 16:31:52,713 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-08-29 16:31:52,718 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-08-29 16:31:52,718 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-08-29 16:31:52,718 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-08-29 16:31:52,719 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-08-29 16:31:52,719 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-08-29 16:31:52,720 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-08-29 16:31:52,720 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-08-29 16:31:52,721 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-08-29 16:31:52,722 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-08-29 16:31:52,722 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-08-29 16:31:52,723 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-08-29 16:31:52,723 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-08-29 16:31:52,724 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-08-29 16:31:52,724 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-08-29 16:31:52,724 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-08-29 16:31:52,725 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-08-29 16:31:52,726 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-08-29 16:31:52,729 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-08-29 16:31:52,757 INFO L113 SettingsManager]: Loading preferences was successful [2021-08-29 16:31:52,757 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-08-29 16:31:52,758 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-08-29 16:31:52,758 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-08-29 16:31:52,759 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-08-29 16:31:52,760 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-08-29 16:31:52,760 INFO L138 SettingsManager]: * Use SBE=true [2021-08-29 16:31:52,760 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-08-29 16:31:52,760 INFO L138 SettingsManager]: * sizeof long=4 [2021-08-29 16:31:52,761 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-08-29 16:31:52,761 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-08-29 16:31:52,761 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-08-29 16:31:52,761 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-08-29 16:31:52,762 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-08-29 16:31:52,762 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-08-29 16:31:52,762 INFO L138 SettingsManager]: * sizeof long double=12 [2021-08-29 16:31:52,762 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-08-29 16:31:52,762 INFO L138 SettingsManager]: * Use constant arrays=true [2021-08-29 16:31:52,762 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-08-29 16:31:52,763 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-08-29 16:31:52,763 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-08-29 16:31:52,763 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-08-29 16:31:52,763 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-29 16:31:52,763 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-08-29 16:31:52,763 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-08-29 16:31:52,764 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-08-29 16:31:52,764 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-08-29 16:31:52,764 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-08-29 16:31:52,764 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-08-29 16:31:52,764 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-08-29 16:31:52,764 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 063966206f80cef10873a8e49ae0985aad7f65cb [2021-08-29 16:31:53,028 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-08-29 16:31:53,046 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-08-29 16:31:53,048 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-08-29 16:31:53,049 INFO L271 PluginConnector]: Initializing CDTParser... [2021-08-29 16:31:53,050 INFO L275 PluginConnector]: CDTParser initialized [2021-08-29 16:31:53,051 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/fibo_5-2.c [2021-08-29 16:31:53,102 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ec3f49d72/2f0dcdb77e20410bac816a63d665559c/FLAG4f7b0e7cc [2021-08-29 16:31:53,395 INFO L306 CDTParser]: Found 1 translation units. [2021-08-29 16:31:53,396 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/fibo_5-2.c [2021-08-29 16:31:53,400 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ec3f49d72/2f0dcdb77e20410bac816a63d665559c/FLAG4f7b0e7cc [2021-08-29 16:31:53,826 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ec3f49d72/2f0dcdb77e20410bac816a63d665559c [2021-08-29 16:31:53,827 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-08-29 16:31:53,828 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-08-29 16:31:53,833 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-08-29 16:31:53,833 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-08-29 16:31:53,835 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-08-29 16:31:53,835 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.08 04:31:53" (1/1) ... [2021-08-29 16:31:53,836 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@74c03918 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:31:53, skipping insertion in model container [2021-08-29 16:31:53,836 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.08 04:31:53" (1/1) ... [2021-08-29 16:31:53,840 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-08-29 16:31:53,847 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-08-29 16:31:53,919 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/fibo_5-2.c[740,753] [2021-08-29 16:31:53,921 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-29 16:31:53,926 INFO L203 MainTranslator]: Completed pre-run [2021-08-29 16:31:53,934 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/fibo_5-2.c[740,753] [2021-08-29 16:31:53,936 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-29 16:31:53,945 INFO L208 MainTranslator]: Completed translation [2021-08-29 16:31:53,945 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:31:53 WrapperNode [2021-08-29 16:31:53,946 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-08-29 16:31:53,946 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-08-29 16:31:53,946 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-08-29 16:31:53,947 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-08-29 16:31:53,951 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:31:53" (1/1) ... [2021-08-29 16:31:53,954 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:31:53" (1/1) ... [2021-08-29 16:31:53,993 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-08-29 16:31:53,994 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-08-29 16:31:53,994 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-08-29 16:31:53,994 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-08-29 16:31:53,999 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:31:53" (1/1) ... [2021-08-29 16:31:53,999 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:31:53" (1/1) ... [2021-08-29 16:31:54,000 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:31:53" (1/1) ... [2021-08-29 16:31:54,000 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:31:53" (1/1) ... [2021-08-29 16:31:54,002 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:31:53" (1/1) ... [2021-08-29 16:31:54,003 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:31:53" (1/1) ... [2021-08-29 16:31:54,003 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:31:53" (1/1) ... [2021-08-29 16:31:54,004 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-08-29 16:31:54,005 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-08-29 16:31:54,005 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-08-29 16:31:54,005 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-08-29 16:31:54,005 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:31:53" (1/1) ... [2021-08-29 16:31:54,009 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-29 16:31:54,015 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:31:54,025 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-08-29 16:31:54,049 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-08-29 16:31:54,052 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-08-29 16:31:54,052 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-08-29 16:31:54,052 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-08-29 16:31:54,052 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-08-29 16:31:54,053 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2021-08-29 16:31:54,053 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2021-08-29 16:31:54,158 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-08-29 16:31:54,159 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-08-29 16:31:54,160 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.08 04:31:54 BoogieIcfgContainer [2021-08-29 16:31:54,160 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-08-29 16:31:54,161 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-08-29 16:31:54,161 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-08-29 16:31:54,163 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-08-29 16:31:54,163 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 29.08 04:31:53" (1/3) ... [2021-08-29 16:31:54,164 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5fbb3408 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.08 04:31:54, skipping insertion in model container [2021-08-29 16:31:54,164 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:31:53" (2/3) ... [2021-08-29 16:31:54,164 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5fbb3408 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.08 04:31:54, skipping insertion in model container [2021-08-29 16:31:54,165 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.08 04:31:54" (3/3) ... [2021-08-29 16:31:54,165 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_5-2.c [2021-08-29 16:31:54,169 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-08-29 16:31:54,170 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-08-29 16:31:54,210 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-08-29 16:31:54,217 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-08-29 16:31:54,217 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-08-29 16:31:54,231 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 15 states have internal predecessors, (18), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-08-29 16:31:54,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-08-29 16:31:54,236 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:31:54,236 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:31:54,237 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:31:54,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:31:54,249 INFO L82 PathProgramCache]: Analyzing trace with hash -1755511548, now seen corresponding path program 1 times [2021-08-29 16:31:54,255 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:31:54,256 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [872325347] [2021-08-29 16:31:54,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:54,257 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:31:54,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:54,452 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:31:54,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:54,499 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-29 16:31:54,500 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:31:54,500 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [872325347] [2021-08-29 16:31:54,500 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [872325347] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-29 16:31:54,501 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-29 16:31:54,501 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-29 16:31:54,502 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464101051] [2021-08-29 16:31:54,506 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-08-29 16:31:54,506 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:31:54,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-29 16:31:54,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-29 16:31:54,526 INFO L87 Difference]: Start difference. First operand has 20 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 15 states have internal predecessors, (18), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-29 16:31:54,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:31:54,606 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2021-08-29 16:31:54,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-08-29 16:31:54,608 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-08-29 16:31:54,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:31:54,613 INFO L225 Difference]: With dead ends: 34 [2021-08-29 16:31:54,613 INFO L226 Difference]: Without dead ends: 18 [2021-08-29 16:31:54,616 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 46.87ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-29 16:31:54,620 INFO L928 BasicCegarLoop]: 6 mSDtfsCounter, 4 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 48.94ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.77ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 59.85ms IncrementalHoareTripleChecker+Time [2021-08-29 16:31:54,621 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 24 Invalid, 67 Unknown, 0 Unchecked, 2.77ms Time], IncrementalHoareTripleChecker [0 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 59.85ms Time] [2021-08-29 16:31:54,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-08-29 16:31:54,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-08-29 16:31:54,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 13 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-08-29 16:31:54,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2021-08-29 16:31:54,650 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 10 [2021-08-29 16:31:54,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:31:54,651 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2021-08-29 16:31:54,651 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-29 16:31:54,651 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2021-08-29 16:31:54,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-08-29 16:31:54,652 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:31:54,652 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:31:54,652 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-08-29 16:31:54,652 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:31:54,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:31:54,653 INFO L82 PathProgramCache]: Analyzing trace with hash 2128459596, now seen corresponding path program 1 times [2021-08-29 16:31:54,653 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:31:54,653 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1162403008] [2021-08-29 16:31:54,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:54,654 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:31:54,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:54,677 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:31:54,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:54,698 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-29 16:31:54,698 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:31:54,699 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1162403008] [2021-08-29 16:31:54,699 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1162403008] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-29 16:31:54,699 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-29 16:31:54,699 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-29 16:31:54,699 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305765819] [2021-08-29 16:31:54,700 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-08-29 16:31:54,700 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:31:54,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-29 16:31:54,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-29 16:31:54,701 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-29 16:31:54,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:31:54,736 INFO L93 Difference]: Finished difference Result 24 states and 29 transitions. [2021-08-29 16:31:54,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-08-29 16:31:54,737 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-08-29 16:31:54,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:31:54,738 INFO L225 Difference]: With dead ends: 24 [2021-08-29 16:31:54,745 INFO L226 Difference]: Without dead ends: 20 [2021-08-29 16:31:54,745 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.24ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-29 16:31:54,746 INFO L928 BasicCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.94ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.02ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 31.58ms IncrementalHoareTripleChecker+Time [2021-08-29 16:31:54,747 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 32 Invalid, 54 Unknown, 0 Unchecked, 1.02ms Time], IncrementalHoareTripleChecker [0 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 31.58ms Time] [2021-08-29 16:31:54,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-08-29 16:31:54,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2021-08-29 16:31:54,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 13 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-08-29 16:31:54,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2021-08-29 16:31:54,761 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 11 [2021-08-29 16:31:54,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:31:54,762 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2021-08-29 16:31:54,762 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-29 16:31:54,762 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2021-08-29 16:31:54,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-08-29 16:31:54,762 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:31:54,763 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:31:54,763 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-08-29 16:31:54,763 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:31:54,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:31:54,763 INFO L82 PathProgramCache]: Analyzing trace with hash -42544313, now seen corresponding path program 1 times [2021-08-29 16:31:54,763 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:31:54,764 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [468605586] [2021-08-29 16:31:54,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:54,764 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:31:54,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:54,806 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:31:54,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:54,847 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:54,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:54,862 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-08-29 16:31:54,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:54,867 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-08-29 16:31:54,867 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:31:54,867 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [468605586] [2021-08-29 16:31:54,867 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [468605586] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:31:54,867 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [481588152] [2021-08-29 16:31:54,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:54,867 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:31:54,867 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:31:54,869 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:31:54,869 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-08-29 16:31:54,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:54,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 6 conjunts are in the unsatisfiable core [2021-08-29 16:31:54,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:31:55,026 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-08-29 16:31:55,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:31:55,302 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-08-29 16:31:55,303 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [481588152] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:31:55,303 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:31:55,303 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 12 [2021-08-29 16:31:55,304 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663957644] [2021-08-29 16:31:55,306 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-08-29 16:31:55,308 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:31:55,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-08-29 16:31:55,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-08-29 16:31:55,310 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand has 12 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 12 states have internal predecessors, (30), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 2 states have call predecessors, (8), 8 states have call successors, (8) [2021-08-29 16:31:55,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:31:55,428 INFO L93 Difference]: Finished difference Result 35 states and 46 transitions. [2021-08-29 16:31:55,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-08-29 16:31:55,428 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 12 states have internal predecessors, (30), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 2 states have call predecessors, (8), 8 states have call successors, (8) Word has length 23 [2021-08-29 16:31:55,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:31:55,429 INFO L225 Difference]: With dead ends: 35 [2021-08-29 16:31:55,429 INFO L226 Difference]: Without dead ends: 20 [2021-08-29 16:31:55,430 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 91.28ms TimeCoverageRelationStatistics Valid=68, Invalid=172, Unknown=0, NotChecked=0, Total=240 [2021-08-29 16:31:55,431 INFO L928 BasicCegarLoop]: 3 mSDtfsCounter, 41 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 60.21ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.66ms SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 72.23ms IncrementalHoareTripleChecker+Time [2021-08-29 16:31:55,431 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 5 Invalid, 135 Unknown, 0 Unchecked, 2.66ms Time], IncrementalHoareTripleChecker [27 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 72.23ms Time] [2021-08-29 16:31:55,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-08-29 16:31:55,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-08-29 16:31:55,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 15 states have internal predecessors, (15), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-08-29 16:31:55,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2021-08-29 16:31:55,435 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 23 [2021-08-29 16:31:55,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:31:55,435 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2021-08-29 16:31:55,436 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 12 states have internal predecessors, (30), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 2 states have call predecessors, (8), 8 states have call successors, (8) [2021-08-29 16:31:55,436 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2021-08-29 16:31:55,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-08-29 16:31:55,437 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:31:55,437 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:31:55,459 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-08-29 16:31:55,653 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:31:55,654 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:31:55,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:31:55,654 INFO L82 PathProgramCache]: Analyzing trace with hash 170813287, now seen corresponding path program 1 times [2021-08-29 16:31:55,655 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:31:55,655 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1382036818] [2021-08-29 16:31:55,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:55,655 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:31:55,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:55,688 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:31:55,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:55,729 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:55,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:55,753 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:55,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:55,772 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-08-29 16:31:55,772 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:31:55,773 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1382036818] [2021-08-29 16:31:55,773 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1382036818] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:31:55,773 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [459954760] [2021-08-29 16:31:55,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:55,773 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:31:55,773 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:31:55,775 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:31:55,777 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-08-29 16:31:55,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:55,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 6 conjunts are in the unsatisfiable core [2021-08-29 16:31:55,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:31:55,872 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-08-29 16:31:55,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:31:56,038 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-08-29 16:31:56,040 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [459954760] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:31:56,040 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:31:56,040 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 7] total 11 [2021-08-29 16:31:56,040 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520650450] [2021-08-29 16:31:56,040 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-08-29 16:31:56,041 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:31:56,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-08-29 16:31:56,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2021-08-29 16:31:56,041 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 11 states, 9 states have (on average 3.111111111111111) internal successors, (28), 11 states have internal predecessors, (28), 7 states have call successors, (7), 1 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 7 states have call successors, (7) [2021-08-29 16:31:56,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:31:56,125 INFO L93 Difference]: Finished difference Result 38 states and 52 transitions. [2021-08-29 16:31:56,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-08-29 16:31:56,125 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 3.111111111111111) internal successors, (28), 11 states have internal predecessors, (28), 7 states have call successors, (7), 1 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 7 states have call successors, (7) Word has length 24 [2021-08-29 16:31:56,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:31:56,127 INFO L225 Difference]: With dead ends: 38 [2021-08-29 16:31:56,127 INFO L226 Difference]: Without dead ends: 34 [2021-08-29 16:31:56,127 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 41.18ms TimeCoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2021-08-29 16:31:56,128 INFO L928 BasicCegarLoop]: 5 mSDtfsCounter, 21 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 51.83ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.27ms SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 64.24ms IncrementalHoareTripleChecker+Time [2021-08-29 16:31:56,128 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 6 Invalid, 148 Unknown, 0 Unchecked, 2.27ms Time], IncrementalHoareTripleChecker [11 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 64.24ms Time] [2021-08-29 16:31:56,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-08-29 16:31:56,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-08-29 16:31:56,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 24 states have internal predecessors, (26), 6 states have call successors, (6), 2 states have call predecessors, (6), 5 states have return successors, (16), 7 states have call predecessors, (16), 6 states have call successors, (16) [2021-08-29 16:31:56,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 48 transitions. [2021-08-29 16:31:56,134 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 48 transitions. Word has length 24 [2021-08-29 16:31:56,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:31:56,134 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 48 transitions. [2021-08-29 16:31:56,134 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 3.111111111111111) internal successors, (28), 11 states have internal predecessors, (28), 7 states have call successors, (7), 1 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 7 states have call successors, (7) [2021-08-29 16:31:56,134 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 48 transitions. [2021-08-29 16:31:56,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-08-29 16:31:56,135 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:31:56,135 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:31:56,153 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-08-29 16:31:56,349 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2021-08-29 16:31:56,350 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:31:56,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:31:56,350 INFO L82 PathProgramCache]: Analyzing trace with hash -187634876, now seen corresponding path program 2 times [2021-08-29 16:31:56,350 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:31:56,350 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [424454147] [2021-08-29 16:31:56,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:56,351 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:31:56,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:56,391 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:31:56,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:56,410 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:56,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:56,444 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:56,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:56,454 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:56,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:56,471 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-29 16:31:56,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:56,482 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 23 proven. 7 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-08-29 16:31:56,482 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:31:56,483 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [424454147] [2021-08-29 16:31:56,483 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [424454147] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:31:56,483 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1704361124] [2021-08-29 16:31:56,483 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-29 16:31:56,483 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:31:56,483 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:31:56,485 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:31:56,485 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-08-29 16:31:56,514 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-29 16:31:56,515 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-29 16:31:56,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 8 conjunts are in the unsatisfiable core [2021-08-29 16:31:56,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:31:56,617 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-08-29 16:31:56,618 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:31:56,879 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 6 proven. 28 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-08-29 16:31:56,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1704361124] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:31:56,880 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:31:56,880 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 9] total 17 [2021-08-29 16:31:56,880 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188641420] [2021-08-29 16:31:56,880 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-08-29 16:31:56,881 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:31:56,881 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-08-29 16:31:56,881 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=204, Unknown=0, NotChecked=0, Total=272 [2021-08-29 16:31:56,881 INFO L87 Difference]: Start difference. First operand 34 states and 48 transitions. Second operand has 17 states, 15 states have (on average 2.933333333333333) internal successors, (44), 17 states have internal predecessors, (44), 10 states have call successors, (12), 1 states have call predecessors, (12), 7 states have return successors, (13), 6 states have call predecessors, (13), 10 states have call successors, (13) [2021-08-29 16:31:57,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:31:57,029 INFO L93 Difference]: Finished difference Result 69 states and 106 transitions. [2021-08-29 16:31:57,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-08-29 16:31:57,029 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 2.933333333333333) internal successors, (44), 17 states have internal predecessors, (44), 10 states have call successors, (12), 1 states have call predecessors, (12), 7 states have return successors, (13), 6 states have call predecessors, (13), 10 states have call successors, (13) Word has length 37 [2021-08-29 16:31:57,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:31:57,032 INFO L225 Difference]: With dead ends: 69 [2021-08-29 16:31:57,032 INFO L226 Difference]: Without dead ends: 38 [2021-08-29 16:31:57,033 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 119.90ms TimeCoverageRelationStatistics Valid=138, Invalid=368, Unknown=0, NotChecked=0, Total=506 [2021-08-29 16:31:57,034 INFO L928 BasicCegarLoop]: 4 mSDtfsCounter, 57 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 199 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 74.14ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.79ms SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 92.91ms IncrementalHoareTripleChecker+Time [2021-08-29 16:31:57,035 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 5 Invalid, 247 Unknown, 0 Unchecked, 1.79ms Time], IncrementalHoareTripleChecker [48 Valid, 199 Invalid, 0 Unknown, 0 Unchecked, 92.91ms Time] [2021-08-29 16:31:57,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-08-29 16:31:57,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-08-29 16:31:57,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 26 states have internal predecessors, (30), 5 states have call successors, (5), 4 states have call predecessors, (5), 5 states have return successors, (11), 7 states have call predecessors, (11), 5 states have call successors, (11) [2021-08-29 16:31:57,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2021-08-29 16:31:57,050 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 37 [2021-08-29 16:31:57,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:31:57,050 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2021-08-29 16:31:57,050 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 2.933333333333333) internal successors, (44), 17 states have internal predecessors, (44), 10 states have call successors, (12), 1 states have call predecessors, (12), 7 states have return successors, (13), 6 states have call predecessors, (13), 10 states have call successors, (13) [2021-08-29 16:31:57,050 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2021-08-29 16:31:57,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-08-29 16:31:57,055 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:31:57,055 INFO L513 BasicCegarLoop]: trace histogram [9, 9, 7, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:31:57,072 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-08-29 16:31:57,260 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:31:57,261 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:31:57,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:31:57,261 INFO L82 PathProgramCache]: Analyzing trace with hash -2015531204, now seen corresponding path program 3 times [2021-08-29 16:31:57,261 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:31:57,261 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1929025776] [2021-08-29 16:31:57,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:57,262 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:31:57,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:57,311 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:31:57,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:57,351 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:57,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:57,392 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:57,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:57,414 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:57,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:57,426 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:57,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:57,433 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-29 16:31:57,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:57,444 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-08-29 16:31:57,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:57,453 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:57,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:57,456 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:57,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:57,459 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 17 proven. 88 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-08-29 16:31:57,459 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:31:57,459 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1929025776] [2021-08-29 16:31:57,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1929025776] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:31:57,459 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [946961824] [2021-08-29 16:31:57,459 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-08-29 16:31:57,460 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:31:57,460 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:31:57,461 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:31:57,488 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-08-29 16:31:57,505 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-08-29 16:31:57,506 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-29 16:31:57,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 8 conjunts are in the unsatisfiable core [2021-08-29 16:31:57,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:31:57,644 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 65 proven. 22 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2021-08-29 16:31:57,645 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:31:58,003 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 65 proven. 29 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-08-29 16:31:58,004 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [946961824] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:31:58,005 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:31:58,005 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7, 9] total 16 [2021-08-29 16:31:58,005 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [267699213] [2021-08-29 16:31:58,007 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-08-29 16:31:58,007 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:31:58,008 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-08-29 16:31:58,008 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2021-08-29 16:31:58,009 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand has 16 states, 15 states have (on average 2.8666666666666667) internal successors, (43), 16 states have internal predecessors, (43), 9 states have call successors, (13), 1 states have call predecessors, (13), 6 states have return successors, (16), 11 states have call predecessors, (16), 9 states have call successors, (16) [2021-08-29 16:31:58,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:31:58,130 INFO L93 Difference]: Finished difference Result 85 states and 124 transitions. [2021-08-29 16:31:58,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-08-29 16:31:58,131 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.8666666666666667) internal successors, (43), 16 states have internal predecessors, (43), 9 states have call successors, (13), 1 states have call predecessors, (13), 6 states have return successors, (16), 11 states have call predecessors, (16), 9 states have call successors, (16) Word has length 65 [2021-08-29 16:31:58,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:31:58,132 INFO L225 Difference]: With dead ends: 85 [2021-08-29 16:31:58,132 INFO L226 Difference]: Without dead ends: 50 [2021-08-29 16:31:58,133 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 139 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 83.04ms TimeCoverageRelationStatistics Valid=109, Invalid=197, Unknown=0, NotChecked=0, Total=306 [2021-08-29 16:31:58,133 INFO L928 BasicCegarLoop]: 5 mSDtfsCounter, 75 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 70.47ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.32ms SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 92.93ms IncrementalHoareTripleChecker+Time [2021-08-29 16:31:58,134 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 6 Invalid, 204 Unknown, 0 Unchecked, 1.32ms Time], IncrementalHoareTripleChecker [57 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 92.93ms Time] [2021-08-29 16:31:58,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-08-29 16:31:58,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2021-08-29 16:31:58,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 32 states have internal predecessors, (38), 7 states have call successors, (7), 5 states have call predecessors, (7), 6 states have return successors, (16), 9 states have call predecessors, (16), 7 states have call successors, (16) [2021-08-29 16:31:58,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 61 transitions. [2021-08-29 16:31:58,138 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 61 transitions. Word has length 65 [2021-08-29 16:31:58,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:31:58,139 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 61 transitions. [2021-08-29 16:31:58,139 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.8666666666666667) internal successors, (43), 16 states have internal predecessors, (43), 9 states have call successors, (13), 1 states have call predecessors, (13), 6 states have return successors, (16), 11 states have call predecessors, (16), 9 states have call successors, (16) [2021-08-29 16:31:58,139 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 61 transitions. [2021-08-29 16:31:58,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-08-29 16:31:58,140 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:31:58,141 INFO L513 BasicCegarLoop]: trace histogram [21, 21, 17, 10, 10, 10, 10, 10, 10, 10, 7, 4, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:31:58,159 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-08-29 16:31:58,357 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:31:58,357 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:31:58,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:31:58,358 INFO L82 PathProgramCache]: Analyzing trace with hash -1033750100, now seen corresponding path program 4 times [2021-08-29 16:31:58,358 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:31:58,358 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [458247370] [2021-08-29 16:31:58,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:58,358 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:31:58,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:58,437 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:31:58,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:58,494 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:58,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:58,523 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:58,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:58,541 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:58,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:58,558 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:58,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:58,568 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:58,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:58,571 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-29 16:31:58,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:58,574 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-08-29 16:31:58,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:58,579 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:58,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:58,581 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:58,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:58,583 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2021-08-29 16:31:58,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:58,599 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:58,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:58,626 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:58,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:58,659 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:58,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:58,671 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:58,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:58,673 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:58,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:58,675 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-29 16:31:58,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:58,678 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-08-29 16:31:58,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:58,686 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:58,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:58,688 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:58,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:58,690 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2021-08-29 16:31:58,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:58,698 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 281 proven. 331 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2021-08-29 16:31:58,698 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:31:58,698 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [458247370] [2021-08-29 16:31:58,699 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [458247370] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:31:58,699 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1447239091] [2021-08-29 16:31:58,699 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-08-29 16:31:58,699 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:31:58,699 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:31:58,700 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:31:58,701 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-08-29 16:31:58,753 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-08-29 16:31:58,754 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-29 16:31:58,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 12 conjunts are in the unsatisfiable core [2021-08-29 16:31:58,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:31:59,006 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 327 proven. 131 refuted. 0 times theorem prover too weak. 698 trivial. 0 not checked. [2021-08-29 16:31:59,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:31:59,872 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 327 proven. 153 refuted. 0 times theorem prover too weak. 676 trivial. 0 not checked. [2021-08-29 16:31:59,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1447239091] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:31:59,873 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:31:59,873 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 9, 13] total 27 [2021-08-29 16:31:59,873 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1467198551] [2021-08-29 16:31:59,874 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-08-29 16:31:59,874 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:31:59,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-08-29 16:31:59,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=545, Unknown=0, NotChecked=0, Total=702 [2021-08-29 16:31:59,875 INFO L87 Difference]: Start difference. First operand 47 states and 61 transitions. Second operand has 27 states, 26 states have (on average 2.6923076923076925) internal successors, (70), 27 states have internal predecessors, (70), 19 states have call successors, (24), 1 states have call predecessors, (24), 11 states have return successors, (33), 19 states have call predecessors, (33), 19 states have call successors, (33) [2021-08-29 16:32:00,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:32:00,336 INFO L93 Difference]: Finished difference Result 117 states and 207 transitions. [2021-08-29 16:32:00,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-08-29 16:32:00,337 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.6923076923076925) internal successors, (70), 27 states have internal predecessors, (70), 19 states have call successors, (24), 1 states have call predecessors, (24), 11 states have return successors, (33), 19 states have call predecessors, (33), 19 states have call successors, (33) Word has length 147 [2021-08-29 16:32:00,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:32:00,341 INFO L225 Difference]: With dead ends: 117 [2021-08-29 16:32:00,341 INFO L226 Difference]: Without dead ends: 63 [2021-08-29 16:32:00,346 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 327 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 425 ImplicationChecksByTransitivity, 263.52ms TimeCoverageRelationStatistics Valid=394, Invalid=1246, Unknown=0, NotChecked=0, Total=1640 [2021-08-29 16:32:00,347 INFO L928 BasicCegarLoop]: 8 mSDtfsCounter, 111 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 640 mSolverCounterSat, 130 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 256.69ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 770 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.99ms SdHoareTripleChecker+Time, 130 IncrementalHoareTripleChecker+Valid, 640 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 326.35ms IncrementalHoareTripleChecker+Time [2021-08-29 16:32:00,347 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [112 Valid, 11 Invalid, 770 Unknown, 0 Unchecked, 3.99ms Time], IncrementalHoareTripleChecker [130 Valid, 640 Invalid, 0 Unknown, 0 Unchecked, 326.35ms Time] [2021-08-29 16:32:00,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-08-29 16:32:00,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 56. [2021-08-29 16:32:00,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 40 states have (on average 1.05) internal successors, (42), 38 states have internal predecessors, (42), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (16), 10 states have call predecessors, (16), 9 states have call successors, (16) [2021-08-29 16:32:00,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 67 transitions. [2021-08-29 16:32:00,361 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 67 transitions. Word has length 147 [2021-08-29 16:32:00,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:32:00,361 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 67 transitions. [2021-08-29 16:32:00,361 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 2.6923076923076925) internal successors, (70), 27 states have internal predecessors, (70), 19 states have call successors, (24), 1 states have call predecessors, (24), 11 states have return successors, (33), 19 states have call predecessors, (33), 19 states have call successors, (33) [2021-08-29 16:32:00,361 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 67 transitions. [2021-08-29 16:32:00,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-08-29 16:32:00,362 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:32:00,362 INFO L513 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:32:00,380 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-08-29 16:32:00,576 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:32:00,577 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:32:00,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:32:00,578 INFO L82 PathProgramCache]: Analyzing trace with hash -292645265, now seen corresponding path program 5 times [2021-08-29 16:32:00,578 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:32:00,578 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1765621197] [2021-08-29 16:32:00,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:32:00,578 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:32:00,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-29 16:32:00,593 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-29 16:32:00,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-29 16:32:00,626 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-29 16:32:00,626 INFO L627 BasicCegarLoop]: Counterexample is feasible [2021-08-29 16:32:00,627 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-08-29 16:32:00,629 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-08-29 16:32:00,632 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-08-29 16:32:00,687 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 29.08 04:32:00 BoogieIcfgContainer [2021-08-29 16:32:00,687 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-08-29 16:32:00,690 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-08-29 16:32:00,690 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-08-29 16:32:00,690 INFO L275 PluginConnector]: Witness Printer initialized [2021-08-29 16:32:00,690 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.08 04:31:54" (3/4) ... [2021-08-29 16:32:00,691 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-08-29 16:32:00,736 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2021-08-29 16:32:00,736 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-08-29 16:32:00,737 INFO L158 Benchmark]: Toolchain (without parser) took 6908.56ms. Allocated memory was 58.7MB in the beginning and 86.0MB in the end (delta: 27.3MB). Free memory was 37.1MB in the beginning and 33.9MB in the end (delta: 3.2MB). Peak memory consumption was 30.1MB. Max. memory is 16.1GB. [2021-08-29 16:32:00,737 INFO L158 Benchmark]: CDTParser took 0.14ms. Allocated memory is still 58.7MB. Free memory was 40.1MB in the beginning and 40.0MB in the end (delta: 44.5kB). There was no memory consumed. Max. memory is 16.1GB. [2021-08-29 16:32:00,737 INFO L158 Benchmark]: CACSL2BoogieTranslator took 113.34ms. Allocated memory is still 58.7MB. Free memory was 37.0MB in the beginning and 27.7MB in the end (delta: 9.3MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-08-29 16:32:00,737 INFO L158 Benchmark]: Boogie Procedure Inliner took 47.38ms. Allocated memory is still 58.7MB. Free memory was 27.7MB in the beginning and 42.1MB in the end (delta: -14.4MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2021-08-29 16:32:00,737 INFO L158 Benchmark]: Boogie Preprocessor took 9.94ms. Allocated memory is still 58.7MB. Free memory was 42.1MB in the beginning and 41.2MB in the end (delta: 887.5kB). There was no memory consumed. Max. memory is 16.1GB. [2021-08-29 16:32:00,738 INFO L158 Benchmark]: RCFGBuilder took 155.74ms. Allocated memory is still 58.7MB. Free memory was 41.2MB in the beginning and 32.9MB in the end (delta: 8.3MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2021-08-29 16:32:00,738 INFO L158 Benchmark]: TraceAbstraction took 6527.81ms. Allocated memory was 58.7MB in the beginning and 86.0MB in the end (delta: 27.3MB). Free memory was 32.4MB in the beginning and 39.4MB in the end (delta: -7.1MB). Peak memory consumption was 22.8MB. Max. memory is 16.1GB. [2021-08-29 16:32:00,738 INFO L158 Benchmark]: Witness Printer took 46.61ms. Allocated memory is still 86.0MB. Free memory was 39.4MB in the beginning and 33.9MB in the end (delta: 5.5MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2021-08-29 16:32:00,740 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14ms. Allocated memory is still 58.7MB. Free memory was 40.1MB in the beginning and 40.0MB in the end (delta: 44.5kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 113.34ms. Allocated memory is still 58.7MB. Free memory was 37.0MB in the beginning and 27.7MB in the end (delta: 9.3MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 47.38ms. Allocated memory is still 58.7MB. Free memory was 27.7MB in the beginning and 42.1MB in the end (delta: -14.4MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * Boogie Preprocessor took 9.94ms. Allocated memory is still 58.7MB. Free memory was 42.1MB in the beginning and 41.2MB in the end (delta: 887.5kB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 155.74ms. Allocated memory is still 58.7MB. Free memory was 41.2MB in the beginning and 32.9MB in the end (delta: 8.3MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * TraceAbstraction took 6527.81ms. Allocated memory was 58.7MB in the beginning and 86.0MB in the end (delta: 27.3MB). Free memory was 32.4MB in the beginning and 39.4MB in the end (delta: -7.1MB). Peak memory consumption was 22.8MB. Max. memory is 16.1GB. * Witness Printer took 46.61ms. Allocated memory is still 86.0MB. Free memory was 39.4MB in the beginning and 33.9MB in the end (delta: 5.5MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.00ms ErrorAutomatonConstructionTimeTotal, 0.00ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.00ms ErrorAutomatonConstructionTimeAvg, 0.00ms ErrorAutomatonDifferenceTimeAvg, 0.00ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 29]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L26] int x = 5; [L27] CALL, EXPR fibo(x) VAL [\old(n)=5] [L8] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L10] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=4] [L8] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L10] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L13] return fibo(n-1) + fibo(n-2); [L13] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L13] return fibo(n-1) + fibo(n-2); [L13] RET, EXPR fibo(n-1) VAL [\old(n)=4, fibo(n-1)=2, n=4] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L13] return fibo(n-1) + fibo(n-2); [L13] RET, EXPR fibo(n-2) VAL [\old(n)=4, fibo(n-1)=2, fibo(n-2)=1, n=4] [L13] return fibo(n-1) + fibo(n-2); [L13] RET, EXPR fibo(n-1) VAL [\old(n)=5, fibo(n-1)=3, n=5] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L13] return fibo(n-1) + fibo(n-2); [L13] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L13] return fibo(n-1) + fibo(n-2); [L13] RET, EXPR fibo(n-2) VAL [\old(n)=5, fibo(n-1)=3, fibo(n-2)=2, n=5] [L13] return fibo(n-1) + fibo(n-2); [L27] RET, EXPR fibo(x) [L27] int result = fibo(x); [L28] COND TRUE result == 5 [L29] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 6422.66ms, OverallIterations: 8, TraceHistogramMax: 21, EmptinessCheckTime: 18.15ms, AutomataDifference: 1133.67ms, DeadEndRemovalTime: 0.00ms, HoareAnnotationTime: 0.00ms, InitialAbstractionConstructionTime: 10.49ms, PartialOrderReductionTime: 0.00ms, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 332 SdHoareTripleChecker+Valid, 740.10ms IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 309 mSDsluCounter, 89 SdHoareTripleChecker+Invalid, 584.22ms Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 464 mSDsCounter, 273 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 1352 IncrementalHoareTripleChecker+Invalid, 1625 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 273 mSolverCounterUnsat, 39 mSDtfsCounter, 1352 mSolverCounterSat, 15.82ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 762 GetRequests, 648 SyntacticMatches, 8 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 647 ImplicationChecksByTransitivity, 655.02ms Time, 0.00ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=56occurred in iteration=7, InterpolantAutomatonStates: 78, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.00ms DumpTime, AutomataMinimizationStatistics: 72.13ms AutomataMinimizationTime, 7 MinimizatonAttempts, 12 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 50.72ms SsaConstructionTime, 196.80ms SatisfiabilityAnalysisTime, 3592.73ms InterpolantComputationTime, 719 NumberOfCodeBlocks, 674 NumberOfCodeBlocksAsserted, 18 NumberOfCheckSat, 892 ConstructedInterpolants, 0 QuantifiedInterpolants, 1846 SizeOfPredicates, 15 NumberOfNonLiveVariables, 661 ConjunctsInSsa, 40 ConjunctsInUnsatCore, 17 InterpolantComputations, 2 PerfectInterpolantSequences, 3405/4251 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! [2021-08-29 16:32:00,774 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Ended with exit code 0 Received shutdown request...