./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 20ed64ec 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_2calls_4-2.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 f684876205455ff045e7b27eb3c5cbf35fa59fa1 ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. 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-dev-20ed64e [2021-08-26 08:59:46,615 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-08-26 08:59:46,617 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-08-26 08:59:46,649 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-08-26 08:59:46,649 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-08-26 08:59:46,652 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-08-26 08:59:46,653 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-08-26 08:59:46,657 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-08-26 08:59:46,660 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-08-26 08:59:46,663 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-08-26 08:59:46,663 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-08-26 08:59:46,666 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-08-26 08:59:46,667 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-08-26 08:59:46,669 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-08-26 08:59:46,670 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-08-26 08:59:46,672 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-08-26 08:59:46,674 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-08-26 08:59:46,674 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-08-26 08:59:46,676 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-08-26 08:59:46,680 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-08-26 08:59:46,681 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-08-26 08:59:46,682 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-08-26 08:59:46,683 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-08-26 08:59:46,684 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-08-26 08:59:46,697 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-08-26 08:59:46,697 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-08-26 08:59:46,697 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-08-26 08:59:46,699 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-08-26 08:59:46,699 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-08-26 08:59:46,699 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-08-26 08:59:46,700 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-08-26 08:59:46,700 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-08-26 08:59:46,701 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-08-26 08:59:46,702 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-08-26 08:59:46,703 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-08-26 08:59:46,703 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-08-26 08:59:46,703 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-08-26 08:59:46,704 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-08-26 08:59:46,704 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-08-26 08:59:46,705 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-08-26 08:59:46,705 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-08-26 08:59:46,709 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-08-26 08:59:46,737 INFO L113 SettingsManager]: Loading preferences was successful [2021-08-26 08:59:46,738 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-08-26 08:59:46,738 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-08-26 08:59:46,739 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-08-26 08:59:46,740 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-08-26 08:59:46,740 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-08-26 08:59:46,740 INFO L138 SettingsManager]: * Use SBE=true [2021-08-26 08:59:46,741 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-08-26 08:59:46,741 INFO L138 SettingsManager]: * sizeof long=4 [2021-08-26 08:59:46,741 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-08-26 08:59:46,741 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-08-26 08:59:46,742 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-08-26 08:59:46,742 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-08-26 08:59:46,742 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-08-26 08:59:46,742 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-08-26 08:59:46,742 INFO L138 SettingsManager]: * sizeof long double=12 [2021-08-26 08:59:46,742 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-08-26 08:59:46,743 INFO L138 SettingsManager]: * Use constant arrays=true [2021-08-26 08:59:46,743 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-08-26 08:59:46,743 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-08-26 08:59:46,743 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-08-26 08:59:46,743 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-08-26 08:59:46,743 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-26 08:59:46,744 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-08-26 08:59:46,744 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-08-26 08:59:46,744 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-08-26 08:59:46,744 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-08-26 08:59:46,744 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-08-26 08:59:46,744 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-08-26 08:59:46,745 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-08-26 08:59:46,745 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f684876205455ff045e7b27eb3c5cbf35fa59fa1 [2021-08-26 08:59:47,019 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-08-26 08:59:47,047 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-08-26 08:59:47,049 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-08-26 08:59:47,051 INFO L271 PluginConnector]: Initializing CDTParser... [2021-08-26 08:59:47,051 INFO L275 PluginConnector]: CDTParser initialized [2021-08-26 08:59:47,052 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c [2021-08-26 08:59:47,098 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ec09dcdb7/5e8b838264ea4b52a7d7eab31cd709eb/FLAG8fbffdc14 [2021-08-26 08:59:47,481 INFO L306 CDTParser]: Found 1 translation units. [2021-08-26 08:59:47,482 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c [2021-08-26 08:59:47,487 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ec09dcdb7/5e8b838264ea4b52a7d7eab31cd709eb/FLAG8fbffdc14 [2021-08-26 08:59:47,500 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ec09dcdb7/5e8b838264ea4b52a7d7eab31cd709eb [2021-08-26 08:59:47,502 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-08-26 08:59:47,504 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-08-26 08:59:47,506 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-08-26 08:59:47,506 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-08-26 08:59:47,508 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-08-26 08:59:47,509 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 08:59:47" (1/1) ... [2021-08-26 08:59:47,509 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@37cbde25 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 08:59:47, skipping insertion in model container [2021-08-26 08:59:47,509 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 08:59:47" (1/1) ... [2021-08-26 08:59:47,514 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-08-26 08:59:47,523 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-08-26 08:59:47,642 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_2calls_4-2.c[946,959] [2021-08-26 08:59:47,644 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-26 08:59:47,650 INFO L203 MainTranslator]: Completed pre-run [2021-08-26 08:59:47,662 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_2calls_4-2.c[946,959] [2021-08-26 08:59:47,663 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-26 08:59:47,694 INFO L208 MainTranslator]: Completed translation [2021-08-26 08:59:47,700 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 08:59:47 WrapperNode [2021-08-26 08:59:47,702 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-08-26 08:59:47,704 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-08-26 08:59:47,704 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-08-26 08:59:47,704 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-08-26 08:59:47,709 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 08:59:47" (1/1) ... [2021-08-26 08:59:47,715 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 08:59:47" (1/1) ... [2021-08-26 08:59:47,726 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-08-26 08:59:47,726 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-08-26 08:59:47,726 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-08-26 08:59:47,727 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-08-26 08:59:47,731 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 08:59:47" (1/1) ... [2021-08-26 08:59:47,731 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 08:59:47" (1/1) ... [2021-08-26 08:59:47,738 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 08:59:47" (1/1) ... [2021-08-26 08:59:47,739 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 08:59:47" (1/1) ... [2021-08-26 08:59:47,747 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 08:59:47" (1/1) ... [2021-08-26 08:59:47,750 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 08:59:47" (1/1) ... [2021-08-26 08:59:47,751 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 08:59:47" (1/1) ... [2021-08-26 08:59:47,757 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-08-26 08:59:47,758 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-08-26 08:59:47,758 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-08-26 08:59:47,758 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-08-26 08:59:47,758 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 08:59:47" (1/1) ... [2021-08-26 08:59:47,764 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-26 08:59:47,770 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 08:59:47,790 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) [2021-08-26 08:59:47,805 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 [2021-08-26 08:59:47,845 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-08-26 08:59:47,846 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2021-08-26 08:59:47,846 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2021-08-26 08:59:47,847 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-08-26 08:59:47,847 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2021-08-26 08:59:47,847 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2021-08-26 08:59:47,847 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-08-26 08:59:47,847 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-08-26 08:59:48,002 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-08-26 08:59:48,003 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-08-26 08:59:48,004 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 08:59:48 BoogieIcfgContainer [2021-08-26 08:59:48,004 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-08-26 08:59:48,005 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-08-26 08:59:48,005 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-08-26 08:59:48,007 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-08-26 08:59:48,007 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 08:59:47" (1/3) ... [2021-08-26 08:59:48,008 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73437a9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 08:59:48, skipping insertion in model container [2021-08-26 08:59:48,008 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 08:59:47" (2/3) ... [2021-08-26 08:59:48,008 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73437a9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 08:59:48, skipping insertion in model container [2021-08-26 08:59:48,008 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 08:59:48" (3/3) ... [2021-08-26 08:59:48,009 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_2calls_4-2.c [2021-08-26 08:59:48,026 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-08-26 08:59:48,027 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-08-26 08:59:48,054 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-08-26 08:59:48,058 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 [2021-08-26 08:59:48,058 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-08-26 08:59:48,068 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 20 states have (on average 1.3) internal successors, (26), 21 states have internal predecessors, (26), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-08-26 08:59:48,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-08-26 08:59:48,077 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 08:59:48,077 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 08:59:48,078 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 08:59:48,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 08:59:48,081 INFO L82 PathProgramCache]: Analyzing trace with hash 1123300790, now seen corresponding path program 1 times [2021-08-26 08:59:48,087 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 08:59:48,087 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1065147684] [2021-08-26 08:59:48,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 08:59:48,088 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 08:59:48,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:48,262 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 08:59:48,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:48,304 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 08:59:48,305 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 08:59:48,305 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1065147684] [2021-08-26 08:59:48,305 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1065147684] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 08:59:48,307 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 08:59:48,307 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-26 08:59:48,308 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650224482] [2021-08-26 08:59:48,313 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-08-26 08:59:48,314 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 08:59:48,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-26 08:59:48,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-26 08:59:48,325 INFO L87 Difference]: Start difference. First operand has 29 states, 20 states have (on average 1.3) internal successors, (26), 21 states have internal predecessors, (26), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) 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) [2021-08-26 08:59:48,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 08:59:48,361 INFO L93 Difference]: Finished difference Result 43 states and 51 transitions. [2021-08-26 08:59:48,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-08-26 08:59:48,362 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 [2021-08-26 08:59:48,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 08:59:48,367 INFO L225 Difference]: With dead ends: 43 [2021-08-26 08:59:48,368 INFO L226 Difference]: Without dead ends: 27 [2021-08-26 08:59:48,370 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 24.3ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-26 08:59:48,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-08-26 08:59:48,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-08-26 08:59:48,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-08-26 08:59:48,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2021-08-26 08:59:48,397 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 10 [2021-08-26 08:59:48,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 08:59:48,398 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2021-08-26 08:59:48,399 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) [2021-08-26 08:59:48,399 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2021-08-26 08:59:48,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-08-26 08:59:48,404 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 08:59:48,404 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 08:59:48,404 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-08-26 08:59:48,404 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 08:59:48,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 08:59:48,406 INFO L82 PathProgramCache]: Analyzing trace with hash 1177745932, now seen corresponding path program 1 times [2021-08-26 08:59:48,406 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 08:59:48,406 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711192469] [2021-08-26 08:59:48,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 08:59:48,407 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 08:59:48,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:48,449 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 08:59:48,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:48,478 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 08:59:48,478 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 08:59:48,478 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711192469] [2021-08-26 08:59:48,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [711192469] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 08:59:48,479 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 08:59:48,479 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-26 08:59:48,479 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1131670937] [2021-08-26 08:59:48,480 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-08-26 08:59:48,480 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 08:59:48,483 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-26 08:59:48,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-26 08:59:48,484 INFO L87 Difference]: Start difference. First operand 27 states and 34 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) [2021-08-26 08:59:48,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 08:59:48,504 INFO L93 Difference]: Finished difference Result 33 states and 41 transitions. [2021-08-26 08:59:48,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-08-26 08:59:48,504 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 [2021-08-26 08:59:48,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 08:59:48,505 INFO L225 Difference]: With dead ends: 33 [2021-08-26 08:59:48,505 INFO L226 Difference]: Without dead ends: 29 [2021-08-26 08:59:48,506 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 12.5ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-26 08:59:48,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-08-26 08:59:48,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2021-08-26 08:59:48,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-08-26 08:59:48,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2021-08-26 08:59:48,510 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 11 [2021-08-26 08:59:48,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 08:59:48,510 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2021-08-26 08:59:48,510 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) [2021-08-26 08:59:48,510 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2021-08-26 08:59:48,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-08-26 08:59:48,511 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 08:59:48,511 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 08:59:48,511 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-08-26 08:59:48,511 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 08:59:48,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 08:59:48,512 INFO L82 PathProgramCache]: Analyzing trace with hash 2110588723, now seen corresponding path program 1 times [2021-08-26 08:59:48,512 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 08:59:48,512 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1610594971] [2021-08-26 08:59:48,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 08:59:48,512 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 08:59:48,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:48,543 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 08:59:48,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:48,575 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-26 08:59:48,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:48,591 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-08-26 08:59:48,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:48,596 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-26 08:59:48,596 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 08:59:48,597 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1610594971] [2021-08-26 08:59:48,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1610594971] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 08:59:48,597 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1018222779] [2021-08-26 08:59:48,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 08:59:48,597 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 08:59:48,597 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 08:59:48,609 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) [2021-08-26 08:59:48,624 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-08-26 08:59:48,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:48,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 6 conjunts are in the unsatisfiable core [2021-08-26 08:59:48,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 08:59:48,830 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-26 08:59:48,831 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1018222779] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 08:59:48,831 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 08:59:48,831 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 10 [2021-08-26 08:59:48,831 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951103525] [2021-08-26 08:59:48,831 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-08-26 08:59:48,831 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 08:59:48,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-08-26 08:59:48,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-08-26 08:59:48,832 INFO L87 Difference]: Start difference. First operand 27 states and 34 transitions. Second operand has 10 states, 8 states have (on average 3.25) internal successors, (26), 10 states have internal predecessors, (26), 6 states have call successors, (6), 1 states have call predecessors, (6), 4 states have return successors, (6), 2 states have call predecessors, (6), 6 states have call successors, (6) [2021-08-26 08:59:48,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 08:59:48,968 INFO L93 Difference]: Finished difference Result 55 states and 75 transitions. [2021-08-26 08:59:48,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-08-26 08:59:48,969 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 3.25) internal successors, (26), 10 states have internal predecessors, (26), 6 states have call successors, (6), 1 states have call predecessors, (6), 4 states have return successors, (6), 2 states have call predecessors, (6), 6 states have call successors, (6) Word has length 23 [2021-08-26 08:59:48,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 08:59:48,972 INFO L225 Difference]: With dead ends: 55 [2021-08-26 08:59:48,972 INFO L226 Difference]: Without dead ends: 31 [2021-08-26 08:59:48,974 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 92.6ms TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-08-26 08:59:48,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-08-26 08:59:48,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2021-08-26 08:59:48,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 21 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-08-26 08:59:48,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2021-08-26 08:59:48,984 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 23 [2021-08-26 08:59:48,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 08:59:48,984 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2021-08-26 08:59:48,985 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 3.25) internal successors, (26), 10 states have internal predecessors, (26), 6 states have call successors, (6), 1 states have call predecessors, (6), 4 states have return successors, (6), 2 states have call predecessors, (6), 6 states have call successors, (6) [2021-08-26 08:59:48,985 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2021-08-26 08:59:48,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-08-26 08:59:48,987 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 08:59:48,987 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 08:59:49,014 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-08-26 08:59:49,212 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 [2021-08-26 08:59:49,213 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 08:59:49,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 08:59:49,213 INFO L82 PathProgramCache]: Analyzing trace with hash 1277869167, now seen corresponding path program 1 times [2021-08-26 08:59:49,213 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 08:59:49,213 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [112565783] [2021-08-26 08:59:49,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 08:59:49,213 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 08:59:49,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:49,246 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 08:59:49,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:49,272 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-26 08:59:49,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:49,287 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-26 08:59:49,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:49,292 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-26 08:59:49,292 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 08:59:49,292 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [112565783] [2021-08-26 08:59:49,292 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [112565783] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 08:59:49,292 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [125757110] [2021-08-26 08:59:49,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 08:59:49,293 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 08:59:49,293 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 08:59:49,298 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) [2021-08-26 08:59:49,304 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-08-26 08:59:49,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:49,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 6 conjunts are in the unsatisfiable core [2021-08-26 08:59:49,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 08:59:49,464 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-26 08:59:49,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [125757110] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 08:59:49,465 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 08:59:49,465 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 10 [2021-08-26 08:59:49,465 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537911147] [2021-08-26 08:59:49,466 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-08-26 08:59:49,466 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 08:59:49,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-08-26 08:59:49,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-08-26 08:59:49,468 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand has 10 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 10 states have internal predecessors, (25), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-08-26 08:59:49,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 08:59:49,603 INFO L93 Difference]: Finished difference Result 51 states and 71 transitions. [2021-08-26 08:59:49,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-08-26 08:59:49,603 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 10 states have internal predecessors, (25), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) Word has length 24 [2021-08-26 08:59:49,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 08:59:49,608 INFO L225 Difference]: With dead ends: 51 [2021-08-26 08:59:49,608 INFO L226 Difference]: Without dead ends: 47 [2021-08-26 08:59:49,608 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 35.9ms TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-08-26 08:59:49,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-08-26 08:59:49,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 45. [2021-08-26 08:59:49,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 31 states have internal predecessors, (38), 9 states have call successors, (9), 4 states have call predecessors, (9), 5 states have return successors, (15), 9 states have call predecessors, (15), 9 states have call successors, (15) [2021-08-26 08:59:49,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 62 transitions. [2021-08-26 08:59:49,624 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 62 transitions. Word has length 24 [2021-08-26 08:59:49,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 08:59:49,625 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 62 transitions. [2021-08-26 08:59:49,626 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 10 states have internal predecessors, (25), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-08-26 08:59:49,626 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 62 transitions. [2021-08-26 08:59:49,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-08-26 08:59:49,631 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 08:59:49,632 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 08:59:49,653 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-08-26 08:59:49,840 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 [2021-08-26 08:59:49,841 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 08:59:49,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 08:59:49,841 INFO L82 PathProgramCache]: Analyzing trace with hash -2061621832, now seen corresponding path program 1 times [2021-08-26 08:59:49,842 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 08:59:49,842 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1803025321] [2021-08-26 08:59:49,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 08:59:49,842 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 08:59:49,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:49,861 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 08:59:49,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:49,878 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-26 08:59:49,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:49,909 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-26 08:59:49,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:49,925 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-08-26 08:59:49,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:49,928 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-08-26 08:59:49,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:49,931 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-08-26 08:59:49,931 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 08:59:49,931 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1803025321] [2021-08-26 08:59:49,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1803025321] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 08:59:49,931 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [15700065] [2021-08-26 08:59:49,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 08:59:49,932 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 08:59:49,932 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 08:59:49,938 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) [2021-08-26 08:59:49,940 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-08-26 08:59:49,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:50,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 8 conjunts are in the unsatisfiable core [2021-08-26 08:59:50,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 08:59:50,162 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-08-26 08:59:50,162 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [15700065] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 08:59:50,163 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 08:59:50,163 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8] total 11 [2021-08-26 08:59:50,163 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416445342] [2021-08-26 08:59:50,163 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-08-26 08:59:50,163 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 08:59:50,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-08-26 08:59:50,164 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-08-26 08:59:50,164 INFO L87 Difference]: Start difference. First operand 45 states and 62 transitions. Second operand has 11 states, 9 states have (on average 4.222222222222222) internal successors, (38), 11 states have internal predecessors, (38), 8 states have call successors, (10), 1 states have call predecessors, (10), 5 states have return successors, (10), 3 states have call predecessors, (10), 8 states have call successors, (10) [2021-08-26 08:59:50,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 08:59:50,393 INFO L93 Difference]: Finished difference Result 105 states and 167 transitions. [2021-08-26 08:59:50,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-08-26 08:59:50,393 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 4.222222222222222) internal successors, (38), 11 states have internal predecessors, (38), 8 states have call successors, (10), 1 states have call predecessors, (10), 5 states have return successors, (10), 3 states have call predecessors, (10), 8 states have call successors, (10) Word has length 36 [2021-08-26 08:59:50,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 08:59:50,396 INFO L225 Difference]: With dead ends: 105 [2021-08-26 08:59:50,397 INFO L226 Difference]: Without dead ends: 63 [2021-08-26 08:59:50,404 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 117.7ms TimeCoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2021-08-26 08:59:50,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-08-26 08:59:50,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-08-26 08:59:50,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 41 states have (on average 1.2439024390243902) internal successors, (51), 44 states have internal predecessors, (51), 12 states have call successors, (12), 5 states have call predecessors, (12), 9 states have return successors, (29), 13 states have call predecessors, (29), 12 states have call successors, (29) [2021-08-26 08:59:50,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 92 transitions. [2021-08-26 08:59:50,414 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 92 transitions. Word has length 36 [2021-08-26 08:59:50,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 08:59:50,414 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 92 transitions. [2021-08-26 08:59:50,414 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 4.222222222222222) internal successors, (38), 11 states have internal predecessors, (38), 8 states have call successors, (10), 1 states have call predecessors, (10), 5 states have return successors, (10), 3 states have call predecessors, (10), 8 states have call successors, (10) [2021-08-26 08:59:50,414 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 92 transitions. [2021-08-26 08:59:50,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-08-26 08:59:50,415 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 08:59:50,416 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 08:59:50,437 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-08-26 08:59:50,620 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 [2021-08-26 08:59:50,621 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 08:59:50,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 08:59:50,621 INFO L82 PathProgramCache]: Analyzing trace with hash 1167294498, now seen corresponding path program 1 times [2021-08-26 08:59:50,621 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 08:59:50,621 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1831987792] [2021-08-26 08:59:50,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 08:59:50,622 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 08:59:50,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:50,641 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 08:59:50,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:50,662 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-26 08:59:50,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:50,715 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-26 08:59:50,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:50,719 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-26 08:59:50,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:50,722 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-26 08:59:50,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:50,732 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-08-26 08:59:50,732 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 08:59:50,732 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1831987792] [2021-08-26 08:59:50,732 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1831987792] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 08:59:50,732 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [752088976] [2021-08-26 08:59:50,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 08:59:50,732 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 08:59:50,732 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 08:59:50,733 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) [2021-08-26 08:59:50,750 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-08-26 08:59:50,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:50,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 8 conjunts are in the unsatisfiable core [2021-08-26 08:59:50,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 08:59:50,954 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-08-26 08:59:50,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [752088976] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 08:59:50,954 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 08:59:50,955 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2021-08-26 08:59:50,955 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423702358] [2021-08-26 08:59:50,955 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-08-26 08:59:50,955 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 08:59:50,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-08-26 08:59:50,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2021-08-26 08:59:50,956 INFO L87 Difference]: Start difference. First operand 63 states and 92 transitions. Second operand has 14 states, 13 states have (on average 3.076923076923077) internal successors, (40), 14 states have internal predecessors, (40), 8 states have call successors, (10), 1 states have call predecessors, (10), 7 states have return successors, (10), 6 states have call predecessors, (10), 8 states have call successors, (10) [2021-08-26 08:59:51,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 08:59:51,303 INFO L93 Difference]: Finished difference Result 177 states and 321 transitions. [2021-08-26 08:59:51,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-08-26 08:59:51,304 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 3.076923076923077) internal successors, (40), 14 states have internal predecessors, (40), 8 states have call successors, (10), 1 states have call predecessors, (10), 7 states have return successors, (10), 6 states have call predecessors, (10), 8 states have call successors, (10) Word has length 37 [2021-08-26 08:59:51,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 08:59:51,308 INFO L225 Difference]: With dead ends: 177 [2021-08-26 08:59:51,308 INFO L226 Difference]: Without dead ends: 117 [2021-08-26 08:59:51,309 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 138.7ms TimeCoverageRelationStatistics Valid=86, Invalid=376, Unknown=0, NotChecked=0, Total=462 [2021-08-26 08:59:51,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-08-26 08:59:51,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 103. [2021-08-26 08:59:51,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 66 states have (on average 1.2121212121212122) internal successors, (80), 69 states have internal predecessors, (80), 21 states have call successors, (21), 7 states have call predecessors, (21), 15 states have return successors, (65), 26 states have call predecessors, (65), 21 states have call successors, (65) [2021-08-26 08:59:51,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 166 transitions. [2021-08-26 08:59:51,332 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 166 transitions. Word has length 37 [2021-08-26 08:59:51,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 08:59:51,332 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 166 transitions. [2021-08-26 08:59:51,332 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 3.076923076923077) internal successors, (40), 14 states have internal predecessors, (40), 8 states have call successors, (10), 1 states have call predecessors, (10), 7 states have return successors, (10), 6 states have call predecessors, (10), 8 states have call successors, (10) [2021-08-26 08:59:51,332 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 166 transitions. [2021-08-26 08:59:51,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-08-26 08:59:51,333 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 08:59:51,333 INFO L512 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 08:59:51,349 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-08-26 08:59:51,548 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 [2021-08-26 08:59:51,549 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 08:59:51,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 08:59:51,549 INFO L82 PathProgramCache]: Analyzing trace with hash 384535367, now seen corresponding path program 1 times [2021-08-26 08:59:51,549 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 08:59:51,549 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [147715036] [2021-08-26 08:59:51,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 08:59:51,550 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 08:59:51,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:51,577 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 08:59:51,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:51,593 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-26 08:59:51,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:51,626 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-26 08:59:51,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:51,661 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-26 08:59:51,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:51,665 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-26 08:59:51,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:51,667 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-26 08:59:51,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:51,676 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2021-08-26 08:59:51,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:51,679 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-08-26 08:59:51,679 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 08:59:51,679 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [147715036] [2021-08-26 08:59:51,680 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [147715036] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 08:59:51,680 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1292862152] [2021-08-26 08:59:51,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 08:59:51,680 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 08:59:51,680 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 08:59:51,681 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) [2021-08-26 08:59:51,696 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-08-26 08:59:51,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:51,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 8 conjunts are in the unsatisfiable core [2021-08-26 08:59:51,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 08:59:51,971 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-08-26 08:59:51,971 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1292862152] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 08:59:51,971 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 08:59:51,971 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 13 [2021-08-26 08:59:51,971 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940704490] [2021-08-26 08:59:51,971 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-08-26 08:59:51,972 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 08:59:51,972 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-08-26 08:59:51,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-08-26 08:59:51,972 INFO L87 Difference]: Start difference. First operand 103 states and 166 transitions. Second operand has 13 states, 12 states have (on average 3.6666666666666665) internal successors, (44), 13 states have internal predecessors, (44), 8 states have call successors, (12), 1 states have call predecessors, (12), 6 states have return successors, (14), 8 states have call predecessors, (14), 8 states have call successors, (14) [2021-08-26 08:59:52,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 08:59:52,226 INFO L93 Difference]: Finished difference Result 262 states and 508 transitions. [2021-08-26 08:59:52,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-08-26 08:59:52,226 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 3.6666666666666665) internal successors, (44), 13 states have internal predecessors, (44), 8 states have call successors, (12), 1 states have call predecessors, (12), 6 states have return successors, (14), 8 states have call predecessors, (14), 8 states have call successors, (14) Word has length 51 [2021-08-26 08:59:52,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 08:59:52,228 INFO L225 Difference]: With dead ends: 262 [2021-08-26 08:59:52,228 INFO L226 Difference]: Without dead ends: 162 [2021-08-26 08:59:52,229 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 98.5ms TimeCoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2021-08-26 08:59:52,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-08-26 08:59:52,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 139. [2021-08-26 08:59:52,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 89 states have (on average 1.202247191011236) internal successors, (107), 91 states have internal predecessors, (107), 31 states have call successors, (31), 10 states have call predecessors, (31), 18 states have return successors, (103), 37 states have call predecessors, (103), 31 states have call successors, (103) [2021-08-26 08:59:52,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 241 transitions. [2021-08-26 08:59:52,254 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 241 transitions. Word has length 51 [2021-08-26 08:59:52,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 08:59:52,255 INFO L470 AbstractCegarLoop]: Abstraction has 139 states and 241 transitions. [2021-08-26 08:59:52,255 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 3.6666666666666665) internal successors, (44), 13 states have internal predecessors, (44), 8 states have call successors, (12), 1 states have call predecessors, (12), 6 states have return successors, (14), 8 states have call predecessors, (14), 8 states have call successors, (14) [2021-08-26 08:59:52,255 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 241 transitions. [2021-08-26 08:59:52,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-08-26 08:59:52,268 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 08:59:52,268 INFO L512 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 08:59:52,288 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-08-26 08:59:52,486 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 [2021-08-26 08:59:52,486 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 08:59:52,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 08:59:52,486 INFO L82 PathProgramCache]: Analyzing trace with hash -1130362923, now seen corresponding path program 1 times [2021-08-26 08:59:52,487 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 08:59:52,487 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1921529179] [2021-08-26 08:59:52,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 08:59:52,487 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 08:59:52,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:52,506 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 08:59:52,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:52,521 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-26 08:59:52,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:52,545 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-26 08:59:52,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:52,587 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-26 08:59:52,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:52,590 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-26 08:59:52,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:52,599 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-26 08:59:52,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:52,604 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-08-26 08:59:52,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:52,616 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 19 proven. 11 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-08-26 08:59:52,616 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 08:59:52,616 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1921529179] [2021-08-26 08:59:52,616 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1921529179] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 08:59:52,616 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [894866357] [2021-08-26 08:59:52,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 08:59:52,617 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 08:59:52,617 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 08:59:52,618 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 08:59:52,644 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-08-26 08:59:52,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:52,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 6 conjunts are in the unsatisfiable core [2021-08-26 08:59:52,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 08:59:52,917 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 18 proven. 5 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-08-26 08:59:52,917 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [894866357] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 08:59:52,917 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 08:59:52,917 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7] total 15 [2021-08-26 08:59:52,917 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164580349] [2021-08-26 08:59:52,918 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-08-26 08:59:52,918 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 08:59:52,918 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-08-26 08:59:52,918 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-08-26 08:59:52,918 INFO L87 Difference]: Start difference. First operand 139 states and 241 transitions. Second operand has 15 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 15 states have internal predecessors, (46), 7 states have call successors, (12), 1 states have call predecessors, (12), 6 states have return successors, (14), 9 states have call predecessors, (14), 7 states have call successors, (14) [2021-08-26 08:59:53,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 08:59:53,174 INFO L93 Difference]: Finished difference Result 301 states and 580 transitions. [2021-08-26 08:59:53,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-08-26 08:59:53,175 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 15 states have internal predecessors, (46), 7 states have call successors, (12), 1 states have call predecessors, (12), 6 states have return successors, (14), 9 states have call predecessors, (14), 7 states have call successors, (14) Word has length 52 [2021-08-26 08:59:53,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 08:59:53,177 INFO L225 Difference]: With dead ends: 301 [2021-08-26 08:59:53,177 INFO L226 Difference]: Without dead ends: 98 [2021-08-26 08:59:53,178 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 108.3ms TimeCoverageRelationStatistics Valid=73, Invalid=307, Unknown=0, NotChecked=0, Total=380 [2021-08-26 08:59:53,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-08-26 08:59:53,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 80. [2021-08-26 08:59:53,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 52 states have (on average 1.1730769230769231) internal successors, (61), 54 states have internal predecessors, (61), 16 states have call successors, (16), 6 states have call predecessors, (16), 11 states have return successors, (46), 19 states have call predecessors, (46), 16 states have call successors, (46) [2021-08-26 08:59:53,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 123 transitions. [2021-08-26 08:59:53,187 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 123 transitions. Word has length 52 [2021-08-26 08:59:53,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 08:59:53,187 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 123 transitions. [2021-08-26 08:59:53,187 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 15 states have internal predecessors, (46), 7 states have call successors, (12), 1 states have call predecessors, (12), 6 states have return successors, (14), 9 states have call predecessors, (14), 7 states have call successors, (14) [2021-08-26 08:59:53,188 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 123 transitions. [2021-08-26 08:59:53,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-08-26 08:59:53,189 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 08:59:53,189 INFO L512 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 08:59:53,212 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-08-26 08:59:53,412 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 08:59:53,413 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 08:59:53,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 08:59:53,413 INFO L82 PathProgramCache]: Analyzing trace with hash 1087717907, now seen corresponding path program 2 times [2021-08-26 08:59:53,413 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 08:59:53,413 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [986517151] [2021-08-26 08:59:53,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 08:59:53,413 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 08:59:53,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:53,442 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 08:59:53,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:53,464 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-26 08:59:53,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:53,488 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-26 08:59:53,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:53,519 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-26 08:59:53,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:53,530 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-26 08:59:53,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:53,534 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-26 08:59:53,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:53,538 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-08-26 08:59:53,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:53,568 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-26 08:59:53,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:53,613 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-26 08:59:53,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:53,616 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-26 08:59:53,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:53,620 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-26 08:59:53,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:59:53,623 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 31 proven. 51 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-08-26 08:59:53,623 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 08:59:53,623 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [986517151] [2021-08-26 08:59:53,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [986517151] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 08:59:53,624 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1090798201] [2021-08-26 08:59:53,624 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-26 08:59:53,624 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 08:59:53,624 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 08:59:53,625 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 08:59:53,666 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-08-26 08:59:53,792 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-26 08:59:53,792 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 08:59:53,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 10 conjunts are in the unsatisfiable core [2021-08-26 08:59:53,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 08:59:54,057 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 54 proven. 18 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-08-26 08:59:54,058 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1090798201] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 08:59:54,058 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 08:59:54,058 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 9] total 20 [2021-08-26 08:59:54,060 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217511686] [2021-08-26 08:59:54,061 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-08-26 08:59:54,061 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 08:59:54,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-08-26 08:59:54,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=321, Unknown=0, NotChecked=0, Total=380 [2021-08-26 08:59:54,062 INFO L87 Difference]: Start difference. First operand 80 states and 123 transitions. Second operand has 20 states, 19 states have (on average 3.1052631578947367) internal successors, (59), 20 states have internal predecessors, (59), 13 states have call successors, (18), 1 states have call predecessors, (18), 9 states have return successors, (22), 13 states have call predecessors, (22), 13 states have call successors, (22) [2021-08-26 08:59:54,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 08:59:54,424 INFO L93 Difference]: Finished difference Result 179 states and 304 transitions. [2021-08-26 08:59:54,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-08-26 08:59:54,425 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 3.1052631578947367) internal successors, (59), 20 states have internal predecessors, (59), 13 states have call successors, (18), 1 states have call predecessors, (18), 9 states have return successors, (22), 13 states have call predecessors, (22), 13 states have call successors, (22) Word has length 79 [2021-08-26 08:59:54,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 08:59:54,426 INFO L225 Difference]: With dead ends: 179 [2021-08-26 08:59:54,426 INFO L226 Difference]: Without dead ends: 89 [2021-08-26 08:59:54,427 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 195.6ms TimeCoverageRelationStatistics Valid=144, Invalid=726, Unknown=0, NotChecked=0, Total=870 [2021-08-26 08:59:54,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-08-26 08:59:54,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 80. [2021-08-26 08:59:54,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 54 states have (on average 1.1666666666666667) internal successors, (63), 54 states have internal predecessors, (63), 14 states have call successors, (14), 8 states have call predecessors, (14), 11 states have return successors, (29), 17 states have call predecessors, (29), 14 states have call successors, (29) [2021-08-26 08:59:54,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 106 transitions. [2021-08-26 08:59:54,432 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 106 transitions. Word has length 79 [2021-08-26 08:59:54,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 08:59:54,433 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 106 transitions. [2021-08-26 08:59:54,433 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 3.1052631578947367) internal successors, (59), 20 states have internal predecessors, (59), 13 states have call successors, (18), 1 states have call predecessors, (18), 9 states have return successors, (22), 13 states have call predecessors, (22), 13 states have call successors, (22) [2021-08-26 08:59:54,433 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 106 transitions. [2021-08-26 08:59:54,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-08-26 08:59:54,434 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 08:59:54,434 INFO L512 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 08:59:54,453 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-08-26 08:59:54,652 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 08:59:54,653 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 08:59:54,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 08:59:54,653 INFO L82 PathProgramCache]: Analyzing trace with hash 780870354, now seen corresponding path program 1 times [2021-08-26 08:59:54,653 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 08:59:54,653 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1130081789] [2021-08-26 08:59:54,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 08:59:54,653 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 08:59:54,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-26 08:59:54,661 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-26 08:59:54,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-26 08:59:54,682 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-26 08:59:54,682 INFO L626 BasicCegarLoop]: Counterexample is feasible [2021-08-26 08:59:54,683 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-08-26 08:59:54,685 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-08-26 08:59:54,689 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-08-26 08:59:54,719 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 26.08 08:59:54 BoogieIcfgContainer [2021-08-26 08:59:54,719 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-08-26 08:59:54,720 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-08-26 08:59:54,720 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-08-26 08:59:54,720 INFO L275 PluginConnector]: Witness Printer initialized [2021-08-26 08:59:54,720 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 08:59:48" (3/4) ... [2021-08-26 08:59:54,721 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-08-26 08:59:54,773 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2021-08-26 08:59:54,774 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-08-26 08:59:54,775 INFO L168 Benchmark]: Toolchain (without parser) took 7270.70 ms. Allocated memory was 65.0 MB in the beginning and 142.6 MB in the end (delta: 77.6 MB). Free memory was 45.1 MB in the beginning and 89.0 MB in the end (delta: -43.9 MB). Peak memory consumption was 33.5 MB. Max. memory is 16.1 GB. [2021-08-26 08:59:54,775 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 65.0 MB. Free memory was 45.3 MB in the beginning and 45.3 MB in the end (delta: 29.1 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-08-26 08:59:54,775 INFO L168 Benchmark]: CACSL2BoogieTranslator took 196.52 ms. Allocated memory is still 65.0 MB. Free memory was 45.0 MB in the beginning and 48.8 MB in the end (delta: -3.9 MB). Peak memory consumption was 11.6 MB. Max. memory is 16.1 GB. [2021-08-26 08:59:54,776 INFO L168 Benchmark]: Boogie Procedure Inliner took 22.14 ms. Allocated memory is still 65.0 MB. Free memory was 48.8 MB in the beginning and 47.3 MB in the end (delta: 1.5 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-08-26 08:59:54,776 INFO L168 Benchmark]: Boogie Preprocessor took 31.02 ms. Allocated memory is still 65.0 MB. Free memory was 47.3 MB in the beginning and 46.3 MB in the end (delta: 974.5 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-08-26 08:59:54,776 INFO L168 Benchmark]: RCFGBuilder took 246.12 ms. Allocated memory is still 65.0 MB. Free memory was 46.3 MB in the beginning and 33.2 MB in the end (delta: 13.1 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2021-08-26 08:59:54,776 INFO L168 Benchmark]: TraceAbstraction took 6714.06 ms. Allocated memory was 65.0 MB in the beginning and 142.6 MB in the end (delta: 77.6 MB). Free memory was 32.7 MB in the beginning and 93.2 MB in the end (delta: -60.5 MB). Peak memory consumption was 17.7 MB. Max. memory is 16.1 GB. [2021-08-26 08:59:54,778 INFO L168 Benchmark]: Witness Printer took 54.17 ms. Allocated memory is still 142.6 MB. Free memory was 93.2 MB in the beginning and 89.0 MB in the end (delta: 4.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-08-26 08:59:54,780 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 65.0 MB. Free memory was 45.3 MB in the beginning and 45.3 MB in the end (delta: 29.1 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 196.52 ms. Allocated memory is still 65.0 MB. Free memory was 45.0 MB in the beginning and 48.8 MB in the end (delta: -3.9 MB). Peak memory consumption was 11.6 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 22.14 ms. Allocated memory is still 65.0 MB. Free memory was 48.8 MB in the beginning and 47.3 MB in the end (delta: 1.5 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 31.02 ms. Allocated memory is still 65.0 MB. Free memory was 47.3 MB in the beginning and 46.3 MB in the end (delta: 974.5 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 246.12 ms. Allocated memory is still 65.0 MB. Free memory was 46.3 MB in the beginning and 33.2 MB in the end (delta: 13.1 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 6714.06 ms. Allocated memory was 65.0 MB in the beginning and 142.6 MB in the end (delta: 77.6 MB). Free memory was 32.7 MB in the beginning and 93.2 MB in the end (delta: -60.5 MB). Peak memory consumption was 17.7 MB. Max. memory is 16.1 GB. * Witness Printer took 54.17 ms. Allocated memory is still 142.6 MB. Free memory was 93.2 MB in the beginning and 89.0 MB in the end (delta: 4.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 41]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L38] int x = 4; [L39] CALL, EXPR fibo1(x) VAL [\old(n)=4] [L10] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L12] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L20] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L22] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L10] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L12] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L20] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L22] COND TRUE n == 1 [L23] return 1; VAL [\old(n)=1, \result=1, n=1] [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L20] COND TRUE n < 1 [L21] return 0; VAL [\old(n)=0, \result=0, n=0] [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L15] return fibo2(n-1) + fibo2(n-2); [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L10] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L12] COND TRUE n == 1 [L13] return 1; VAL [\old(n)=1, \result=1, n=1] [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L20] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L22] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L10] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L12] COND TRUE n == 1 [L13] return 1; VAL [\old(n)=1, \result=1, n=1] [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L10] COND TRUE n < 1 [L11] return 0; VAL [\old(n)=0, \result=0, n=0] [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L15] return fibo2(n-1) + fibo2(n-2); [L39] RET, EXPR fibo1(x) [L39] int result = fibo1(x); [L40] COND TRUE result == 3 [L41] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 29 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 6634.6ms, OverallIterations: 10, TraceHistogramMax: 6, EmptinessCheckTime: 41.6ms, AutomataDifference: 1839.3ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 7.5ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 247 SDtfs, 304 SDslu, 1380 SDs, 0 SdLazy, 2006 SolverSat, 268 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 956.7ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 516 GetRequests, 386 SyntacticMatches, 3 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 391 ImplicationChecksByTransitivity, 824.6ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=139occurred in iteration=7, InterpolantAutomatonStates: 113, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 117.5ms AutomataMinimizationTime, 9 MinimizatonAttempts, 70 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 61.2ms SsaConstructionTime, 216.2ms SatisfiabilityAnalysisTime, 2142.4ms InterpolantComputationTime, 690 NumberOfCodeBlocks, 690 NumberOfCodeBlocksAsserted, 18 NumberOfCheckSat, 609 ConstructedInterpolants, 0 QuantifiedInterpolants, 1225 SizeOfPredicates, 19 NumberOfNonLiveVariables, 879 ConjunctsInSsa, 52 ConjunctsInUnsatCore, 16 InterpolantComputations, 2 PerfectInterpolantSequences, 388/526 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! [2021-08-26 08:59:54,828 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...