./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive-simple/fibo_2calls_6-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5fbdf5bf Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/recursive-simple/fibo_2calls_6-2.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 92a849e92f30134540f9595cfce3299e46e1c2b1 ....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.1-wip.dd.seqcomp-5fbdf5b [2021-08-29 16:31:31,660 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-08-29 16:31:31,668 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-08-29 16:31:31,696 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-08-29 16:31:31,696 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-08-29 16:31:31,697 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-08-29 16:31:31,698 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-08-29 16:31:31,699 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-08-29 16:31:31,701 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-08-29 16:31:31,702 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-08-29 16:31:31,702 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-08-29 16:31:31,703 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-08-29 16:31:31,704 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-08-29 16:31:31,705 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-08-29 16:31:31,706 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-08-29 16:31:31,707 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-08-29 16:31:31,707 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-08-29 16:31:31,708 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-08-29 16:31:31,710 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-08-29 16:31:31,711 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-08-29 16:31:31,713 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-08-29 16:31:31,715 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-08-29 16:31:31,716 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-08-29 16:31:31,719 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-08-29 16:31:31,721 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-08-29 16:31:31,721 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-08-29 16:31:31,721 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-08-29 16:31:31,722 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-08-29 16:31:31,722 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-08-29 16:31:31,723 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-08-29 16:31:31,723 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-08-29 16:31:31,724 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-08-29 16:31:31,724 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-08-29 16:31:31,725 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-08-29 16:31:31,725 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-08-29 16:31:31,726 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-08-29 16:31:31,726 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-08-29 16:31:31,726 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-08-29 16:31:31,727 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-08-29 16:31:31,727 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-08-29 16:31:31,728 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-08-29 16:31:31,729 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-08-29 16:31:31,744 INFO L113 SettingsManager]: Loading preferences was successful [2021-08-29 16:31:31,744 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-08-29 16:31:31,745 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-08-29 16:31:31,745 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-08-29 16:31:31,746 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-08-29 16:31:31,746 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-08-29 16:31:31,746 INFO L138 SettingsManager]: * Use SBE=true [2021-08-29 16:31:31,746 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-08-29 16:31:31,746 INFO L138 SettingsManager]: * sizeof long=4 [2021-08-29 16:31:31,747 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-08-29 16:31:31,747 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-08-29 16:31:31,747 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-08-29 16:31:31,747 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-08-29 16:31:31,747 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-08-29 16:31:31,747 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-08-29 16:31:31,748 INFO L138 SettingsManager]: * sizeof long double=12 [2021-08-29 16:31:31,748 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-08-29 16:31:31,748 INFO L138 SettingsManager]: * Use constant arrays=true [2021-08-29 16:31:31,748 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-08-29 16:31:31,748 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-08-29 16:31:31,748 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-08-29 16:31:31,749 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-08-29 16:31:31,749 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-29 16:31:31,749 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-08-29 16:31:31,749 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-08-29 16:31:31,749 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-08-29 16:31:31,749 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-08-29 16:31:31,750 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-08-29 16:31:31,750 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-08-29 16:31:31,750 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-08-29 16:31:31,750 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 92a849e92f30134540f9595cfce3299e46e1c2b1 [2021-08-29 16:31:31,969 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-08-29 16:31:31,987 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-08-29 16:31:31,989 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-08-29 16:31:31,991 INFO L271 PluginConnector]: Initializing CDTParser... [2021-08-29 16:31:31,991 INFO L275 PluginConnector]: CDTParser initialized [2021-08-29 16:31:31,995 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/fibo_2calls_6-2.c [2021-08-29 16:31:32,044 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/34e4d5199/e1c3fe86c4ed4a2ab2e4ef54d15bc8b7/FLAGd1e163f27 [2021-08-29 16:31:32,387 INFO L306 CDTParser]: Found 1 translation units. [2021-08-29 16:31:32,387 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/fibo_2calls_6-2.c [2021-08-29 16:31:32,392 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/34e4d5199/e1c3fe86c4ed4a2ab2e4ef54d15bc8b7/FLAGd1e163f27 [2021-08-29 16:31:32,404 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/34e4d5199/e1c3fe86c4ed4a2ab2e4ef54d15bc8b7 [2021-08-29 16:31:32,405 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-08-29 16:31:32,406 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-08-29 16:31:32,407 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-08-29 16:31:32,408 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-08-29 16:31:32,410 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-08-29 16:31:32,410 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.08 04:31:32" (1/1) ... [2021-08-29 16:31:32,412 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@21bc17a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:31:32, skipping insertion in model container [2021-08-29 16:31:32,412 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.08 04:31:32" (1/1) ... [2021-08-29 16:31:32,416 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-08-29 16:31:32,428 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-08-29 16:31:32,532 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_6-2.c[946,959] [2021-08-29 16:31:32,535 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-29 16:31:32,541 INFO L203 MainTranslator]: Completed pre-run [2021-08-29 16:31:32,551 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_6-2.c[946,959] [2021-08-29 16:31:32,552 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-29 16:31:32,560 INFO L208 MainTranslator]: Completed translation [2021-08-29 16:31:32,561 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:31:32 WrapperNode [2021-08-29 16:31:32,561 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-08-29 16:31:32,562 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-08-29 16:31:32,562 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-08-29 16:31:32,562 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-08-29 16:31:32,566 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:31:32" (1/1) ... [2021-08-29 16:31:32,570 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:31:32" (1/1) ... [2021-08-29 16:31:32,589 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-08-29 16:31:32,590 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-08-29 16:31:32,590 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-08-29 16:31:32,590 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-08-29 16:31:32,595 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:31:32" (1/1) ... [2021-08-29 16:31:32,607 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:31:32" (1/1) ... [2021-08-29 16:31:32,608 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:31:32" (1/1) ... [2021-08-29 16:31:32,608 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:31:32" (1/1) ... [2021-08-29 16:31:32,610 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:31:32" (1/1) ... [2021-08-29 16:31:32,612 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:31:32" (1/1) ... [2021-08-29 16:31:32,612 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:31:32" (1/1) ... [2021-08-29 16:31:32,613 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-08-29 16:31:32,614 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-08-29 16:31:32,614 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-08-29 16:31:32,614 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-08-29 16:31:32,615 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:31:32" (1/1) ... [2021-08-29 16:31:32,621 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-29 16:31:32,627 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:31:32,636 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-08-29 16:31:32,669 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-08-29 16:31:32,674 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-08-29 16:31:32,674 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2021-08-29 16:31:32,675 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2021-08-29 16:31:32,675 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-08-29 16:31:32,675 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2021-08-29 16:31:32,676 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2021-08-29 16:31:32,676 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-08-29 16:31:32,676 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-08-29 16:31:32,802 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-08-29 16:31:32,803 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-08-29 16:31:32,805 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.08 04:31:32 BoogieIcfgContainer [2021-08-29 16:31:32,805 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-08-29 16:31:32,807 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-08-29 16:31:32,808 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-08-29 16:31:32,810 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-08-29 16:31:32,810 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 29.08 04:31:32" (1/3) ... [2021-08-29 16:31:32,811 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@23d91d76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.08 04:31:32, skipping insertion in model container [2021-08-29 16:31:32,812 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:31:32" (2/3) ... [2021-08-29 16:31:32,812 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@23d91d76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.08 04:31:32, skipping insertion in model container [2021-08-29 16:31:32,812 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.08 04:31:32" (3/3) ... [2021-08-29 16:31:32,814 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_2calls_6-2.c [2021-08-29 16:31:32,820 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-08-29 16:31:32,820 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-08-29 16:31:32,861 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-08-29 16:31:32,871 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-08-29 16:31:32,872 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-08-29 16:31:32,889 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) [2021-08-29 16:31:32,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-08-29 16:31:32,895 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:31:32,896 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:31:32,897 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:31:32,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:31:32,901 INFO L82 PathProgramCache]: Analyzing trace with hash 1123300790, now seen corresponding path program 1 times [2021-08-29 16:31:32,907 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:31:32,907 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1541290750] [2021-08-29 16:31:32,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:32,909 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:31:32,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:33,047 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:31:33,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:33,093 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-29 16:31:33,094 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:31:33,094 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1541290750] [2021-08-29 16:31:33,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1541290750] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-29 16:31:33,095 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-29 16:31:33,095 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-29 16:31:33,096 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1025570476] [2021-08-29 16:31:33,099 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-08-29 16:31:33,099 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:31:33,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-29 16:31:33,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-29 16:31:33,129 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) [2021-08-29 16:31:33,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:31:33,246 INFO L93 Difference]: Finished difference Result 43 states and 51 transitions. [2021-08-29 16:31:33,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-08-29 16:31:33,248 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-08-29 16:31:33,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:31:33,253 INFO L225 Difference]: With dead ends: 43 [2021-08-29 16:31:33,253 INFO L226 Difference]: Without dead ends: 27 [2021-08-29 16:31:33,255 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 14.31ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-29 16:31:33,257 INFO L928 BasicCegarLoop]: 10 mSDtfsCounter, 4 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 76.25ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.90ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 94.36ms IncrementalHoareTripleChecker+Time [2021-08-29 16:31:33,258 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 40 Invalid, 99 Unknown, 0 Unchecked, 1.90ms Time], IncrementalHoareTripleChecker [0 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 94.36ms Time] [2021-08-29 16:31:33,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-08-29 16:31:33,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-08-29 16:31:33,281 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) [2021-08-29 16:31:33,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2021-08-29 16:31:33,282 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 10 [2021-08-29 16:31:33,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:31:33,283 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2021-08-29 16:31:33,283 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-29 16:31:33,283 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2021-08-29 16:31:33,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-08-29 16:31:33,284 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:31:33,284 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:31:33,284 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-08-29 16:31:33,284 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:31:33,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:31:33,285 INFO L82 PathProgramCache]: Analyzing trace with hash 1177745932, now seen corresponding path program 1 times [2021-08-29 16:31:33,285 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:31:33,285 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [576846352] [2021-08-29 16:31:33,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:33,285 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:31:33,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:33,310 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:31:33,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:33,336 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-29 16:31:33,337 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:31:33,337 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [576846352] [2021-08-29 16:31:33,337 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [576846352] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-29 16:31:33,337 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-29 16:31:33,337 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-29 16:31:33,337 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475570374] [2021-08-29 16:31:33,338 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-08-29 16:31:33,338 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:31:33,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-29 16:31:33,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-29 16:31:33,339 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) [2021-08-29 16:31:33,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:31:33,384 INFO L93 Difference]: Finished difference Result 33 states and 41 transitions. [2021-08-29 16:31:33,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-08-29 16:31:33,384 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-08-29 16:31:33,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:31:33,385 INFO L225 Difference]: With dead ends: 33 [2021-08-29 16:31:33,385 INFO L226 Difference]: Without dead ends: 29 [2021-08-29 16:31:33,385 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.32ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-29 16:31:33,386 INFO L928 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 30.52ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.50ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 38.84ms IncrementalHoareTripleChecker+Time [2021-08-29 16:31:33,387 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 48 Invalid, 86 Unknown, 0 Unchecked, 1.50ms Time], IncrementalHoareTripleChecker [0 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 38.84ms Time] [2021-08-29 16:31:33,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-08-29 16:31:33,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2021-08-29 16:31:33,397 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) [2021-08-29 16:31:33,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2021-08-29 16:31:33,399 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 11 [2021-08-29 16:31:33,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:31:33,400 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2021-08-29 16:31:33,400 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-29 16:31:33,400 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2021-08-29 16:31:33,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-08-29 16:31:33,401 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:31:33,401 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:31:33,402 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-08-29 16:31:33,403 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:31:33,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:31:33,407 INFO L82 PathProgramCache]: Analyzing trace with hash 2110588723, now seen corresponding path program 1 times [2021-08-29 16:31:33,407 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:31:33,407 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1194586411] [2021-08-29 16:31:33,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:33,408 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:31:33,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:33,450 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:31:33,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:33,482 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:33,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:33,506 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-08-29 16:31:33,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:33,513 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-29 16:31:33,514 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:31:33,514 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1194586411] [2021-08-29 16:31:33,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1194586411] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:31:33,515 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [658273874] [2021-08-29 16:31:33,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:33,515 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:31:33,515 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:31:33,516 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:31:33,528 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-08-29 16:31:33,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:33,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 6 conjunts are in the unsatisfiable core [2021-08-29 16:31:33,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:31:33,706 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-29 16:31:33,706 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:31:33,914 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-29 16:31:33,914 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [658273874] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:31:33,914 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:31:33,915 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 13 [2021-08-29 16:31:33,915 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857773289] [2021-08-29 16:31:33,916 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-08-29 16:31:33,918 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:31:33,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-08-29 16:31:33,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-08-29 16:31:33,920 INFO L87 Difference]: Start difference. First operand 27 states and 34 transitions. Second operand has 13 states, 10 states have (on average 3.2) internal successors, (32), 13 states have internal predecessors, (32), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 2 states have call predecessors, (8), 8 states have call successors, (8) [2021-08-29 16:31:34,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:31:34,084 INFO L93 Difference]: Finished difference Result 55 states and 75 transitions. [2021-08-29 16:31:34,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-08-29 16:31:34,085 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 10 states have (on average 3.2) internal successors, (32), 13 states have internal predecessors, (32), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 2 states have call predecessors, (8), 8 states have call successors, (8) Word has length 23 [2021-08-29 16:31:34,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:31:34,085 INFO L225 Difference]: With dead ends: 55 [2021-08-29 16:31:34,086 INFO L226 Difference]: Without dead ends: 31 [2021-08-29 16:31:34,086 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 43 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 115.05ms TimeCoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2021-08-29 16:31:34,087 INFO L928 BasicCegarLoop]: 5 mSDtfsCounter, 32 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 94.10ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.08ms SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 115.24ms IncrementalHoareTripleChecker+Time [2021-08-29 16:31:34,087 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 34 Invalid, 250 Unknown, 0 Unchecked, 3.08ms Time], IncrementalHoareTripleChecker [14 Valid, 236 Invalid, 0 Unknown, 0 Unchecked, 115.24ms Time] [2021-08-29 16:31:34,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-08-29 16:31:34,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2021-08-29 16:31:34,094 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) [2021-08-29 16:31:34,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2021-08-29 16:31:34,097 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 23 [2021-08-29 16:31:34,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:31:34,097 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2021-08-29 16:31:34,098 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 10 states have (on average 3.2) internal successors, (32), 13 states have internal predecessors, (32), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 2 states have call predecessors, (8), 8 states have call successors, (8) [2021-08-29 16:31:34,098 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2021-08-29 16:31:34,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-08-29 16:31:34,101 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:31:34,101 INFO L513 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] [2021-08-29 16:31:34,123 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-08-29 16:31:34,313 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:31:34,313 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:31:34,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:31:34,314 INFO L82 PathProgramCache]: Analyzing trace with hash 1277869167, now seen corresponding path program 1 times [2021-08-29 16:31:34,314 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:31:34,315 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1496522052] [2021-08-29 16:31:34,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:34,315 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:31:34,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:34,349 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:31:34,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:34,375 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:34,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:34,396 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:34,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:34,401 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-29 16:31:34,401 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:31:34,401 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1496522052] [2021-08-29 16:31:34,401 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1496522052] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:31:34,402 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [497732465] [2021-08-29 16:31:34,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:34,402 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:31:34,402 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:31:34,403 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:31:34,408 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-08-29 16:31:34,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:34,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 6 conjunts are in the unsatisfiable core [2021-08-29 16:31:34,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:31:34,502 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-29 16:31:34,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:31:34,647 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-29 16:31:34,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [497732465] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:31:34,648 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:31:34,648 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 13 [2021-08-29 16:31:34,648 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1056327544] [2021-08-29 16:31:34,649 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-08-29 16:31:34,649 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:31:34,649 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-08-29 16:31:34,649 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2021-08-29 16:31:34,650 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand has 13 states, 11 states have (on average 2.909090909090909) internal successors, (32), 13 states have internal predecessors, (32), 7 states have call successors, (7), 1 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 7 states have call successors, (7) [2021-08-29 16:31:34,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:31:34,784 INFO L93 Difference]: Finished difference Result 51 states and 71 transitions. [2021-08-29 16:31:34,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-08-29 16:31:34,785 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 2.909090909090909) internal successors, (32), 13 states have internal predecessors, (32), 7 states have call successors, (7), 1 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 7 states have call successors, (7) Word has length 24 [2021-08-29 16:31:34,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:31:34,791 INFO L225 Difference]: With dead ends: 51 [2021-08-29 16:31:34,791 INFO L226 Difference]: Without dead ends: 47 [2021-08-29 16:31:34,793 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 52.59ms TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2021-08-29 16:31:34,798 INFO L928 BasicCegarLoop]: 7 mSDtfsCounter, 32 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 256 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 82.91ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.69ms SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 256 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 112.47ms IncrementalHoareTripleChecker+Time [2021-08-29 16:31:34,799 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 35 Invalid, 279 Unknown, 0 Unchecked, 1.69ms Time], IncrementalHoareTripleChecker [23 Valid, 256 Invalid, 0 Unknown, 0 Unchecked, 112.47ms Time] [2021-08-29 16:31:34,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-08-29 16:31:34,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 45. [2021-08-29 16:31:34,809 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) [2021-08-29 16:31:34,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 62 transitions. [2021-08-29 16:31:34,813 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 62 transitions. Word has length 24 [2021-08-29 16:31:34,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:31:34,813 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 62 transitions. [2021-08-29 16:31:34,814 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 2.909090909090909) internal successors, (32), 13 states have internal predecessors, (32), 7 states have call successors, (7), 1 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 7 states have call successors, (7) [2021-08-29 16:31:34,814 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 62 transitions. [2021-08-29 16:31:34,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-08-29 16:31:34,818 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:31:34,819 INFO L513 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] [2021-08-29 16:31:34,835 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-08-29 16:31:35,020 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2021-08-29 16:31:35,021 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:31:35,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:31:35,022 INFO L82 PathProgramCache]: Analyzing trace with hash -2061621832, now seen corresponding path program 1 times [2021-08-29 16:31:35,022 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:31:35,022 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1758497471] [2021-08-29 16:31:35,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:35,022 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:31:35,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:35,050 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:31:35,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:35,074 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:35,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:35,100 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:35,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:35,114 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-08-29 16:31:35,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:35,120 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-08-29 16:31:35,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:35,129 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-08-29 16:31:35,129 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:31:35,130 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1758497471] [2021-08-29 16:31:35,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1758497471] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:31:35,131 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1680285694] [2021-08-29 16:31:35,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:35,132 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:31:35,132 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:31:35,137 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:31:35,138 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-08-29 16:31:35,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:35,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 8 conjunts are in the unsatisfiable core [2021-08-29 16:31:35,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:31:35,272 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-08-29 16:31:35,272 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:31:35,590 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-08-29 16:31:35,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1680285694] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:31:35,591 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:31:35,591 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 9] total 15 [2021-08-29 16:31:35,592 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1710027700] [2021-08-29 16:31:35,593 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-08-29 16:31:35,593 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:31:35,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-08-29 16:31:35,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-08-29 16:31:35,594 INFO L87 Difference]: Start difference. First operand 45 states and 62 transitions. Second operand has 15 states, 12 states have (on average 3.9166666666666665) internal successors, (47), 15 states have internal predecessors, (47), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) [2021-08-29 16:31:35,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:31:35,789 INFO L93 Difference]: Finished difference Result 105 states and 167 transitions. [2021-08-29 16:31:35,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-08-29 16:31:35,790 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 12 states have (on average 3.9166666666666665) internal successors, (47), 15 states have internal predecessors, (47), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) Word has length 36 [2021-08-29 16:31:35,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:31:35,793 INFO L225 Difference]: With dead ends: 105 [2021-08-29 16:31:35,793 INFO L226 Difference]: Without dead ends: 63 [2021-08-29 16:31:35,797 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 75 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 122.49ms TimeCoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2021-08-29 16:31:35,798 INFO L928 BasicCegarLoop]: 6 mSDtfsCounter, 65 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 259 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 99.68ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.83ms SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 259 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 130.89ms IncrementalHoareTripleChecker+Time [2021-08-29 16:31:35,798 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 29 Invalid, 309 Unknown, 0 Unchecked, 2.83ms Time], IncrementalHoareTripleChecker [50 Valid, 259 Invalid, 0 Unknown, 0 Unchecked, 130.89ms Time] [2021-08-29 16:31:35,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-08-29 16:31:35,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-08-29 16:31:35,813 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) [2021-08-29 16:31:35,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 92 transitions. [2021-08-29 16:31:35,815 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 92 transitions. Word has length 36 [2021-08-29 16:31:35,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:31:35,815 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 92 transitions. [2021-08-29 16:31:35,816 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 12 states have (on average 3.9166666666666665) internal successors, (47), 15 states have internal predecessors, (47), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) [2021-08-29 16:31:35,816 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 92 transitions. [2021-08-29 16:31:35,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-08-29 16:31:35,821 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:31:35,822 INFO L513 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] [2021-08-29 16:31:35,843 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-08-29 16:31:36,037 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:31:36,037 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:31:36,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:31:36,037 INFO L82 PathProgramCache]: Analyzing trace with hash 1167294498, now seen corresponding path program 1 times [2021-08-29 16:31:36,038 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:31:36,038 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1989434198] [2021-08-29 16:31:36,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:36,038 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:31:36,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:36,062 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:31:36,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:36,073 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:36,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:36,097 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:36,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:36,101 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:36,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:36,104 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-29 16:31:36,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:36,122 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-08-29 16:31:36,122 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:31:36,122 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1989434198] [2021-08-29 16:31:36,122 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1989434198] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:31:36,122 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1583828939] [2021-08-29 16:31:36,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:36,123 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:31:36,123 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:31:36,125 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:31:36,148 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-08-29 16:31:36,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:36,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 8 conjunts are in the unsatisfiable core [2021-08-29 16:31:36,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:31:36,268 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-08-29 16:31:36,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:31:36,523 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-08-29 16:31:36,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1583828939] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:31:36,524 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:31:36,524 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9] total 18 [2021-08-29 16:31:36,524 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [362687993] [2021-08-29 16:31:36,525 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-08-29 16:31:36,525 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:31:36,525 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-08-29 16:31:36,525 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-08-29 16:31:36,525 INFO L87 Difference]: Start difference. First operand 63 states and 92 transitions. Second operand has 18 states, 16 states have (on average 3.125) internal successors, (50), 18 states have internal predecessors, (50), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) [2021-08-29 16:31:36,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:31:36,928 INFO L93 Difference]: Finished difference Result 177 states and 321 transitions. [2021-08-29 16:31:36,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-08-29 16:31:36,928 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 3.125) internal successors, (50), 18 states have internal predecessors, (50), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) Word has length 37 [2021-08-29 16:31:36,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:31:36,933 INFO L225 Difference]: With dead ends: 177 [2021-08-29 16:31:36,933 INFO L226 Difference]: Without dead ends: 117 [2021-08-29 16:31:36,934 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 134.38ms TimeCoverageRelationStatistics Valid=120, Invalid=530, Unknown=0, NotChecked=0, Total=650 [2021-08-29 16:31:36,935 INFO L928 BasicCegarLoop]: 9 mSDtfsCounter, 60 mSDsluCounter, 244 mSDsCounter, 0 mSdLazyCounter, 615 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 244.46ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 688 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.40ms SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 615 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 298.87ms IncrementalHoareTripleChecker+Time [2021-08-29 16:31:36,935 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 63 Invalid, 688 Unknown, 0 Unchecked, 7.40ms Time], IncrementalHoareTripleChecker [73 Valid, 615 Invalid, 0 Unknown, 0 Unchecked, 298.87ms Time] [2021-08-29 16:31:36,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-08-29 16:31:36,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 103. [2021-08-29 16:31:36,957 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) [2021-08-29 16:31:36,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 166 transitions. [2021-08-29 16:31:36,958 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 166 transitions. Word has length 37 [2021-08-29 16:31:36,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:31:36,958 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 166 transitions. [2021-08-29 16:31:36,958 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 3.125) internal successors, (50), 18 states have internal predecessors, (50), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) [2021-08-29 16:31:36,958 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 166 transitions. [2021-08-29 16:31:36,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-08-29 16:31:36,959 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:31:36,964 INFO L513 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] [2021-08-29 16:31:36,982 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-08-29 16:31:37,168 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:31:37,168 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:31:37,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:31:37,168 INFO L82 PathProgramCache]: Analyzing trace with hash 384535367, now seen corresponding path program 1 times [2021-08-29 16:31:37,169 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:31:37,169 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1559002667] [2021-08-29 16:31:37,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:37,169 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:31:37,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:37,206 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:31:37,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:37,217 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:37,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:37,227 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:37,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:37,252 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:37,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:37,255 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:37,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:37,258 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-29 16:31:37,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:37,266 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2021-08-29 16:31:37,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:37,270 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-08-29 16:31:37,271 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:31:37,271 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1559002667] [2021-08-29 16:31:37,271 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1559002667] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:31:37,271 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [732833747] [2021-08-29 16:31:37,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:37,271 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:31:37,271 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:31:37,272 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:31:37,284 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-08-29 16:31:37,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:37,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 10 conjunts are in the unsatisfiable core [2021-08-29 16:31:37,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:31:37,456 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-08-29 16:31:37,457 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:31:37,848 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-08-29 16:31:37,849 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [732833747] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:31:37,849 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:31:37,849 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 11] total 20 [2021-08-29 16:31:37,849 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781141882] [2021-08-29 16:31:37,849 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-08-29 16:31:37,850 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:31:37,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-08-29 16:31:37,850 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=312, Unknown=0, NotChecked=0, Total=380 [2021-08-29 16:31:37,850 INFO L87 Difference]: Start difference. First operand 103 states and 166 transitions. Second operand has 20 states, 18 states have (on average 3.3333333333333335) internal successors, (60), 20 states have internal predecessors, (60), 14 states have call successors, (16), 1 states have call predecessors, (16), 8 states have return successors, (18), 7 states have call predecessors, (18), 14 states have call successors, (18) [2021-08-29 16:31:38,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:31:38,254 INFO L93 Difference]: Finished difference Result 255 states and 495 transitions. [2021-08-29 16:31:38,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-08-29 16:31:38,255 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 3.3333333333333335) internal successors, (60), 20 states have internal predecessors, (60), 14 states have call successors, (16), 1 states have call predecessors, (16), 8 states have return successors, (18), 7 states have call predecessors, (18), 14 states have call successors, (18) Word has length 51 [2021-08-29 16:31:38,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:31:38,257 INFO L225 Difference]: With dead ends: 255 [2021-08-29 16:31:38,257 INFO L226 Difference]: Without dead ends: 155 [2021-08-29 16:31:38,258 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 162.65ms TimeCoverageRelationStatistics Valid=150, Invalid=662, Unknown=0, NotChecked=0, Total=812 [2021-08-29 16:31:38,259 INFO L928 BasicCegarLoop]: 9 mSDtfsCounter, 76 mSDsluCounter, 249 mSDsCounter, 0 mSdLazyCounter, 697 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 244.31ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 818 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.14ms SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 697 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 309.22ms IncrementalHoareTripleChecker+Time [2021-08-29 16:31:38,259 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 62 Invalid, 818 Unknown, 0 Unchecked, 4.14ms Time], IncrementalHoareTripleChecker [121 Valid, 697 Invalid, 0 Unknown, 0 Unchecked, 309.22ms Time] [2021-08-29 16:31:38,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-08-29 16:31:38,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 109. [2021-08-29 16:31:38,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 71 states have (on average 1.2253521126760563) internal successors, (87), 72 states have internal predecessors, (87), 24 states have call successors, (24), 9 states have call predecessors, (24), 13 states have return successors, (66), 27 states have call predecessors, (66), 24 states have call successors, (66) [2021-08-29 16:31:38,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 177 transitions. [2021-08-29 16:31:38,280 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 177 transitions. Word has length 51 [2021-08-29 16:31:38,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:31:38,280 INFO L470 AbstractCegarLoop]: Abstraction has 109 states and 177 transitions. [2021-08-29 16:31:38,281 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 3.3333333333333335) internal successors, (60), 20 states have internal predecessors, (60), 14 states have call successors, (16), 1 states have call predecessors, (16), 8 states have return successors, (18), 7 states have call predecessors, (18), 14 states have call successors, (18) [2021-08-29 16:31:38,281 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 177 transitions. [2021-08-29 16:31:38,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-08-29 16:31:38,282 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:31:38,282 INFO L513 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:31:38,301 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-08-29 16:31:38,496 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:31:38,499 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:31:38,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:31:38,499 INFO L82 PathProgramCache]: Analyzing trace with hash -586612948, now seen corresponding path program 1 times [2021-08-29 16:31:38,499 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:31:38,499 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507713345] [2021-08-29 16:31:38,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:38,500 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:31:38,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:38,527 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:31:38,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:38,554 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:38,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:38,565 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:38,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:38,583 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:38,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:38,608 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:38,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:38,613 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:38,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:38,616 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-29 16:31:38,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:38,619 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-08-29 16:31:38,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:38,628 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-08-29 16:31:38,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:38,633 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:38,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:38,637 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:38,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:38,639 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:38,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:38,641 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-29 16:31:38,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:38,644 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 40 proven. 57 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-08-29 16:31:38,644 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:31:38,645 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1507713345] [2021-08-29 16:31:38,645 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1507713345] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:31:38,645 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [838460262] [2021-08-29 16:31:38,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:38,645 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:31:38,645 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:31:38,646 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) [2021-08-29 16:31:38,660 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-08-29 16:31:38,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:38,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 12 conjunts are in the unsatisfiable core [2021-08-29 16:31:38,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:31:38,918 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 13 proven. 92 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2021-08-29 16:31:38,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:31:39,641 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 13 proven. 102 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-08-29 16:31:39,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [838460262] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:31:39,642 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:31:39,642 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 13] total 23 [2021-08-29 16:31:39,642 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1507507803] [2021-08-29 16:31:39,642 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-08-29 16:31:39,642 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:31:39,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-08-29 16:31:39,643 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=421, Unknown=0, NotChecked=0, Total=506 [2021-08-29 16:31:39,643 INFO L87 Difference]: Start difference. First operand 109 states and 177 transitions. Second operand has 23 states, 22 states have (on average 3.4545454545454546) internal successors, (76), 23 states have internal predecessors, (76), 17 states have call successors, (22), 1 states have call predecessors, (22), 9 states have return successors, (26), 11 states have call predecessors, (26), 17 states have call successors, (26) [2021-08-29 16:31:40,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:31:40,068 INFO L93 Difference]: Finished difference Result 240 states and 462 transitions. [2021-08-29 16:31:40,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-08-29 16:31:40,069 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 3.4545454545454546) internal successors, (76), 23 states have internal predecessors, (76), 17 states have call successors, (22), 1 states have call predecessors, (22), 9 states have return successors, (26), 11 states have call predecessors, (26), 17 states have call successors, (26) Word has length 93 [2021-08-29 16:31:40,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:31:40,070 INFO L225 Difference]: With dead ends: 240 [2021-08-29 16:31:40,070 INFO L226 Difference]: Without dead ends: 107 [2021-08-29 16:31:40,071 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 198 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 213 ImplicationChecksByTransitivity, 236.19ms TimeCoverageRelationStatistics Valid=218, Invalid=972, Unknown=0, NotChecked=0, Total=1190 [2021-08-29 16:31:40,072 INFO L928 BasicCegarLoop]: 9 mSDtfsCounter, 115 mSDsluCounter, 209 mSDsCounter, 0 mSdLazyCounter, 610 mSolverCounterSat, 147 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 231.09ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 757 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.66ms SdHoareTripleChecker+Time, 147 IncrementalHoareTripleChecker+Valid, 610 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 300.56ms IncrementalHoareTripleChecker+Time [2021-08-29 16:31:40,072 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [122 Valid, 61 Invalid, 757 Unknown, 0 Unchecked, 3.66ms Time], IncrementalHoareTripleChecker [147 Valid, 610 Invalid, 0 Unknown, 0 Unchecked, 300.56ms Time] [2021-08-29 16:31:40,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-08-29 16:31:40,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 84. [2021-08-29 16:31:40,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 57 states have (on average 1.1754385964912282) internal successors, (67), 58 states have internal predecessors, (67), 14 states have call successors, (14), 8 states have call predecessors, (14), 12 states have return successors, (35), 17 states have call predecessors, (35), 14 states have call successors, (35) [2021-08-29 16:31:40,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 116 transitions. [2021-08-29 16:31:40,078 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 116 transitions. Word has length 93 [2021-08-29 16:31:40,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:31:40,078 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 116 transitions. [2021-08-29 16:31:40,078 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 3.4545454545454546) internal successors, (76), 23 states have internal predecessors, (76), 17 states have call successors, (22), 1 states have call predecessors, (22), 9 states have return successors, (26), 11 states have call predecessors, (26), 17 states have call successors, (26) [2021-08-29 16:31:40,078 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 116 transitions. [2021-08-29 16:31:40,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-08-29 16:31:40,079 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:31:40,080 INFO L513 BasicCegarLoop]: trace histogram [12, 12, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:31:40,097 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-08-29 16:31:40,296 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 [2021-08-29 16:31:40,297 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:31:40,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:31:40,297 INFO L82 PathProgramCache]: Analyzing trace with hash 1129417830, now seen corresponding path program 1 times [2021-08-29 16:31:40,298 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:31:40,298 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [239830992] [2021-08-29 16:31:40,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:40,298 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:31:40,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:40,341 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:31:40,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:40,362 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:40,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:40,376 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:40,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:40,388 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:40,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:40,413 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:40,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:40,453 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:40,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:40,458 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:40,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:40,461 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-29 16:31:40,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:40,464 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-08-29 16:31:40,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:40,477 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-08-29 16:31:40,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:40,484 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:40,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:40,490 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:40,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:40,492 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:40,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:40,494 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:40,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:40,496 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-29 16:31:40,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:40,498 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-08-29 16:31:40,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:40,501 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 106 [2021-08-29 16:31:40,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:40,506 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:40,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:40,511 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:40,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:40,513 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:40,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:40,514 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-29 16:31:40,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:40,516 INFO L134 CoverageAnalysis]: Checked inductivity of 564 backedges. 73 proven. 135 refuted. 0 times theorem prover too weak. 356 trivial. 0 not checked. [2021-08-29 16:31:40,516 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:31:40,516 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [239830992] [2021-08-29 16:31:40,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [239830992] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:31:40,517 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1493565875] [2021-08-29 16:31:40,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:40,517 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:31:40,517 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:31:40,518 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) [2021-08-29 16:31:40,551 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-08-29 16:31:40,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:40,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 10 conjunts are in the unsatisfiable core [2021-08-29 16:31:40,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:31:40,845 INFO L134 CoverageAnalysis]: Checked inductivity of 564 backedges. 60 proven. 121 refuted. 0 times theorem prover too weak. 383 trivial. 0 not checked. [2021-08-29 16:31:40,845 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:31:41,501 INFO L134 CoverageAnalysis]: Checked inductivity of 564 backedges. 60 proven. 126 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2021-08-29 16:31:41,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1493565875] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:31:41,502 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:31:41,502 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9, 11] total 21 [2021-08-29 16:31:41,502 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571085594] [2021-08-29 16:31:41,503 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-08-29 16:31:41,503 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:31:41,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-08-29 16:31:41,503 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=347, Unknown=0, NotChecked=0, Total=420 [2021-08-29 16:31:41,503 INFO L87 Difference]: Start difference. First operand 84 states and 116 transitions. Second operand has 21 states, 20 states have (on average 3.5) internal successors, (70), 21 states have internal predecessors, (70), 14 states have call successors, (21), 1 states have call predecessors, (21), 8 states have return successors, (26), 12 states have call predecessors, (26), 14 states have call successors, (26) [2021-08-29 16:31:41,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:31:41,831 INFO L93 Difference]: Finished difference Result 169 states and 248 transitions. [2021-08-29 16:31:41,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-08-29 16:31:41,832 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 3.5) internal successors, (70), 21 states have internal predecessors, (70), 14 states have call successors, (21), 1 states have call predecessors, (21), 8 states have return successors, (26), 12 states have call predecessors, (26), 14 states have call successors, (26) Word has length 148 [2021-08-29 16:31:41,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:31:41,832 INFO L225 Difference]: With dead ends: 169 [2021-08-29 16:31:41,832 INFO L226 Difference]: Without dead ends: 93 [2021-08-29 16:31:41,833 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 329 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 180.08ms TimeCoverageRelationStatistics Valid=164, Invalid=706, Unknown=0, NotChecked=0, Total=870 [2021-08-29 16:31:41,833 INFO L928 BasicCegarLoop]: 9 mSDtfsCounter, 88 mSDsluCounter, 241 mSDsCounter, 0 mSdLazyCounter, 609 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 195.03ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 687 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.14ms SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 609 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 246.17ms IncrementalHoareTripleChecker+Time [2021-08-29 16:31:41,834 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 71 Invalid, 687 Unknown, 0 Unchecked, 3.14ms Time], IncrementalHoareTripleChecker [78 Valid, 609 Invalid, 0 Unknown, 0 Unchecked, 246.17ms Time] [2021-08-29 16:31:41,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-08-29 16:31:41,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 87. [2021-08-29 16:31:41,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 59 states have (on average 1.1694915254237288) internal successors, (69), 60 states have internal predecessors, (69), 14 states have call successors, (14), 8 states have call predecessors, (14), 13 states have return successors, (35), 18 states have call predecessors, (35), 14 states have call successors, (35) [2021-08-29 16:31:41,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 118 transitions. [2021-08-29 16:31:41,841 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 118 transitions. Word has length 148 [2021-08-29 16:31:41,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:31:41,841 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 118 transitions. [2021-08-29 16:31:41,841 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 3.5) internal successors, (70), 21 states have internal predecessors, (70), 14 states have call successors, (21), 1 states have call predecessors, (21), 8 states have return successors, (26), 12 states have call predecessors, (26), 14 states have call successors, (26) [2021-08-29 16:31:41,841 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 118 transitions. [2021-08-29 16:31:41,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-08-29 16:31:41,842 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:31:41,842 INFO L513 BasicCegarLoop]: trace histogram [12, 12, 10, 9, 9, 8, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:31:41,858 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-08-29 16:31:42,056 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 [2021-08-29 16:31:42,057 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:31:42,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:31:42,057 INFO L82 PathProgramCache]: Analyzing trace with hash -2043735506, now seen corresponding path program 2 times [2021-08-29 16:31:42,057 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:31:42,057 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [712583984] [2021-08-29 16:31:42,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:42,057 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:31:42,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:42,090 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:31:42,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:42,113 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:42,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:42,147 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:42,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:42,164 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:42,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:42,169 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:42,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:42,172 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:42,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:42,174 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:42,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:42,177 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-29 16:31:42,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:42,179 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-08-29 16:31:42,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:42,208 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:42,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:42,211 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:42,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:42,213 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2021-08-29 16:31:42,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:42,232 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:42,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:42,241 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:42,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:42,244 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 92 [2021-08-29 16:31:42,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:42,251 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:42,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:42,254 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:42,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:42,255 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:42,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:42,256 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-08-29 16:31:42,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:42,259 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:42,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:42,261 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:42,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:42,263 INFO L134 CoverageAnalysis]: Checked inductivity of 565 backedges. 112 proven. 115 refuted. 0 times theorem prover too weak. 338 trivial. 0 not checked. [2021-08-29 16:31:42,263 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:31:42,263 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [712583984] [2021-08-29 16:31:42,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [712583984] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:31:42,263 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1758075372] [2021-08-29 16:31:42,263 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-29 16:31:42,263 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:31:42,264 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:31:42,265 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:31:42,291 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-08-29 16:31:42,342 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-29 16:31:42,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-29 16:31:42,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 10 conjunts are in the unsatisfiable core [2021-08-29 16:31:42,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:31:42,579 INFO L134 CoverageAnalysis]: Checked inductivity of 565 backedges. 80 proven. 101 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2021-08-29 16:31:42,579 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:31:43,185 INFO L134 CoverageAnalysis]: Checked inductivity of 565 backedges. 80 proven. 106 refuted. 0 times theorem prover too weak. 379 trivial. 0 not checked. [2021-08-29 16:31:43,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1758075372] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:31:43,186 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:31:43,186 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9, 11] total 21 [2021-08-29 16:31:43,186 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622671942] [2021-08-29 16:31:43,187 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-08-29 16:31:43,187 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:31:43,187 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-08-29 16:31:43,187 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=345, Unknown=0, NotChecked=0, Total=420 [2021-08-29 16:31:43,187 INFO L87 Difference]: Start difference. First operand 87 states and 118 transitions. Second operand has 21 states, 20 states have (on average 3.6) internal successors, (72), 21 states have internal predecessors, (72), 14 states have call successors, (21), 1 states have call predecessors, (21), 8 states have return successors, (26), 13 states have call predecessors, (26), 14 states have call successors, (26) [2021-08-29 16:31:43,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:31:43,523 INFO L93 Difference]: Finished difference Result 184 states and 267 transitions. [2021-08-29 16:31:43,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-08-29 16:31:43,523 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 3.6) internal successors, (72), 21 states have internal predecessors, (72), 14 states have call successors, (21), 1 states have call predecessors, (21), 8 states have return successors, (26), 13 states have call predecessors, (26), 14 states have call successors, (26) Word has length 148 [2021-08-29 16:31:43,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:31:43,524 INFO L225 Difference]: With dead ends: 184 [2021-08-29 16:31:43,524 INFO L226 Difference]: Without dead ends: 107 [2021-08-29 16:31:43,525 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 358 GetRequests, 328 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 195.18ms TimeCoverageRelationStatistics Valid=159, Invalid=711, Unknown=0, NotChecked=0, Total=870 [2021-08-29 16:31:43,525 INFO L928 BasicCegarLoop]: 9 mSDtfsCounter, 70 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 614 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 195.07ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 683 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.68ms SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 614 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 253.32ms IncrementalHoareTripleChecker+Time [2021-08-29 16:31:43,526 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 70 Invalid, 683 Unknown, 0 Unchecked, 2.68ms Time], IncrementalHoareTripleChecker [69 Valid, 614 Invalid, 0 Unknown, 0 Unchecked, 253.32ms Time] [2021-08-29 16:31:43,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-08-29 16:31:43,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 87. [2021-08-29 16:31:43,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 59 states have (on average 1.1694915254237288) internal successors, (69), 60 states have internal predecessors, (69), 14 states have call successors, (14), 8 states have call predecessors, (14), 13 states have return successors, (33), 18 states have call predecessors, (33), 14 states have call successors, (33) [2021-08-29 16:31:43,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 116 transitions. [2021-08-29 16:31:43,530 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 116 transitions. Word has length 148 [2021-08-29 16:31:43,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:31:43,530 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 116 transitions. [2021-08-29 16:31:43,530 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 3.6) internal successors, (72), 21 states have internal predecessors, (72), 14 states have call successors, (21), 1 states have call predecessors, (21), 8 states have return successors, (26), 13 states have call predecessors, (26), 14 states have call successors, (26) [2021-08-29 16:31:43,530 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 116 transitions. [2021-08-29 16:31:43,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-08-29 16:31:43,531 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:31:43,531 INFO L513 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 11, 9, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:31:43,551 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-08-29 16:31:43,732 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-08-29 16:31:43,732 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:31:43,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:31:43,733 INFO L82 PathProgramCache]: Analyzing trace with hash -552714558, now seen corresponding path program 3 times [2021-08-29 16:31:43,733 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:31:43,733 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1881693128] [2021-08-29 16:31:43,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:43,733 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:31:43,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:43,771 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:31:43,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:43,813 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:43,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:43,843 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:43,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:43,860 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:43,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:43,864 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:43,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:43,867 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:43,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:43,868 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:43,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:43,870 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-29 16:31:43,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:43,871 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-08-29 16:31:43,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:43,900 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:43,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:43,903 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:43,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:43,905 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2021-08-29 16:31:43,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:43,911 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:43,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:43,915 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:43,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:43,917 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:43,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:43,918 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:43,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:43,920 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-29 16:31:43,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:43,923 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-08-29 16:31:43,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:43,925 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:43,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:43,926 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:43,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:43,928 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 132 [2021-08-29 16:31:43,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:43,945 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:43,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:43,963 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:43,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:43,972 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:43,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:43,974 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-29 16:31:43,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:43,977 INFO L134 CoverageAnalysis]: Checked inductivity of 787 backedges. 207 proven. 121 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2021-08-29 16:31:43,978 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:31:43,978 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1881693128] [2021-08-29 16:31:43,978 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1881693128] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:31:43,978 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [44785118] [2021-08-29 16:31:43,978 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-08-29 16:31:43,978 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:31:43,978 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:31:43,985 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:31:43,986 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-08-29 16:31:44,039 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-08-29 16:31:44,040 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-29 16:31:44,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 8 conjunts are in the unsatisfiable core [2021-08-29 16:31:44,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:31:44,326 INFO L134 CoverageAnalysis]: Checked inductivity of 787 backedges. 135 proven. 32 refuted. 0 times theorem prover too weak. 620 trivial. 0 not checked. [2021-08-29 16:31:44,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:31:44,907 INFO L134 CoverageAnalysis]: Checked inductivity of 787 backedges. 135 proven. 34 refuted. 0 times theorem prover too weak. 618 trivial. 0 not checked. [2021-08-29 16:31:44,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [44785118] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:31:44,907 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:31:44,907 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 8, 9] total 24 [2021-08-29 16:31:44,908 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1234898193] [2021-08-29 16:31:44,908 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-08-29 16:31:44,908 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:31:44,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-08-29 16:31:44,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=461, Unknown=0, NotChecked=0, Total=552 [2021-08-29 16:31:44,909 INFO L87 Difference]: Start difference. First operand 87 states and 116 transitions. Second operand has 24 states, 23 states have (on average 3.130434782608696) internal successors, (72), 24 states have internal predecessors, (72), 13 states have call successors, (22), 1 states have call predecessors, (22), 10 states have return successors, (26), 18 states have call predecessors, (26), 13 states have call successors, (26) [2021-08-29 16:31:45,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:31:45,252 INFO L93 Difference]: Finished difference Result 187 states and 270 transitions. [2021-08-29 16:31:45,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-08-29 16:31:45,252 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 3.130434782608696) internal successors, (72), 24 states have internal predecessors, (72), 13 states have call successors, (22), 1 states have call predecessors, (22), 10 states have return successors, (26), 18 states have call predecessors, (26), 13 states have call successors, (26) Word has length 174 [2021-08-29 16:31:45,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:31:45,253 INFO L225 Difference]: With dead ends: 187 [2021-08-29 16:31:45,253 INFO L226 Difference]: Without dead ends: 106 [2021-08-29 16:31:45,254 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 421 GetRequests, 388 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 203.93ms TimeCoverageRelationStatistics Valid=174, Invalid=882, Unknown=0, NotChecked=0, Total=1056 [2021-08-29 16:31:45,254 INFO L928 BasicCegarLoop]: 9 mSDtfsCounter, 90 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 635 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 187.64ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 717 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.37ms SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 635 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 245.90ms IncrementalHoareTripleChecker+Time [2021-08-29 16:31:45,255 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 65 Invalid, 717 Unknown, 0 Unchecked, 2.37ms Time], IncrementalHoareTripleChecker [82 Valid, 635 Invalid, 0 Unknown, 0 Unchecked, 245.90ms Time] [2021-08-29 16:31:45,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-08-29 16:31:45,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 87. [2021-08-29 16:31:45,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 59 states have (on average 1.1694915254237288) internal successors, (69), 60 states have internal predecessors, (69), 14 states have call successors, (14), 8 states have call predecessors, (14), 13 states have return successors, (29), 18 states have call predecessors, (29), 14 states have call successors, (29) [2021-08-29 16:31:45,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 112 transitions. [2021-08-29 16:31:45,259 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 112 transitions. Word has length 174 [2021-08-29 16:31:45,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:31:45,259 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 112 transitions. [2021-08-29 16:31:45,259 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 3.130434782608696) internal successors, (72), 24 states have internal predecessors, (72), 13 states have call successors, (22), 1 states have call predecessors, (22), 10 states have return successors, (26), 18 states have call predecessors, (26), 13 states have call successors, (26) [2021-08-29 16:31:45,259 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 112 transitions. [2021-08-29 16:31:45,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 218 [2021-08-29 16:31:45,260 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:31:45,261 INFO L513 BasicCegarLoop]: trace histogram [17, 17, 15, 14, 14, 12, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:31:45,279 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-08-29 16:31:45,476 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:31:45,477 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:31:45,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:31:45,477 INFO L82 PathProgramCache]: Analyzing trace with hash -712391191, now seen corresponding path program 4 times [2021-08-29 16:31:45,477 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:31:45,477 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [999763581] [2021-08-29 16:31:45,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:45,477 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:31:45,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,527 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:31:45,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,557 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:45,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,581 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:45,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,603 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:45,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,624 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:45,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,647 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:45,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,656 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:45,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,658 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-29 16:31:45,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,660 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-08-29 16:31:45,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,663 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:45,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,664 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:45,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,668 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2021-08-29 16:31:45,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,674 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:45,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,676 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:45,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,678 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:45,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,679 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-29 16:31:45,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,681 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 106 [2021-08-29 16:31:45,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,707 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:45,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,721 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:45,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,730 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:45,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,733 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:45,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,734 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:45,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,736 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-29 16:31:45,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,737 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-08-29 16:31:45,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,770 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:45,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,772 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:45,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,776 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2021-08-29 16:31:45,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,780 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:45,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,784 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:45,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,786 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:45,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,787 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-29 16:31:45,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:45,789 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 194 proven. 345 refuted. 0 times theorem prover too weak. 736 trivial. 0 not checked. [2021-08-29 16:31:45,789 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:31:45,789 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [999763581] [2021-08-29 16:31:45,790 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [999763581] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:31:45,790 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1329316687] [2021-08-29 16:31:45,790 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-08-29 16:31:45,790 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:31:45,790 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:31:45,793 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:31:45,832 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-08-29 16:31:45,878 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-08-29 16:31:45,878 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-29 16:31:45,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 12 conjunts are in the unsatisfiable core [2021-08-29 16:31:45,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:31:46,223 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 97 proven. 261 refuted. 0 times theorem prover too weak. 917 trivial. 0 not checked. [2021-08-29 16:31:46,223 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:31:47,171 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 101 proven. 265 refuted. 0 times theorem prover too weak. 909 trivial. 0 not checked. [2021-08-29 16:31:47,171 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1329316687] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:31:47,172 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:31:47,172 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 10, 13] total 33 [2021-08-29 16:31:47,172 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1416422296] [2021-08-29 16:31:47,172 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-08-29 16:31:47,172 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:31:47,173 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-08-29 16:31:47,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=906, Unknown=0, NotChecked=0, Total=1056 [2021-08-29 16:31:47,173 INFO L87 Difference]: Start difference. First operand 87 states and 112 transitions. Second operand has 33 states, 32 states have (on average 2.875) internal successors, (92), 33 states have internal predecessors, (92), 19 states have call successors, (28), 1 states have call predecessors, (28), 15 states have return successors, (36), 25 states have call predecessors, (36), 19 states have call successors, (36) [2021-08-29 16:31:48,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:31:48,039 INFO L93 Difference]: Finished difference Result 250 states and 417 transitions. [2021-08-29 16:31:48,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-08-29 16:31:48,040 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 2.875) internal successors, (92), 33 states have internal predecessors, (92), 19 states have call successors, (28), 1 states have call predecessors, (28), 15 states have return successors, (36), 25 states have call predecessors, (36), 19 states have call successors, (36) Word has length 217 [2021-08-29 16:31:48,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:31:48,041 INFO L225 Difference]: With dead ends: 250 [2021-08-29 16:31:48,041 INFO L226 Difference]: Without dead ends: 131 [2021-08-29 16:31:48,042 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 538 GetRequests, 481 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 924 ImplicationChecksByTransitivity, 419.00ms TimeCoverageRelationStatistics Valid=444, Invalid=2748, Unknown=0, NotChecked=0, Total=3192 [2021-08-29 16:31:48,042 INFO L928 BasicCegarLoop]: 17 mSDtfsCounter, 139 mSDsluCounter, 481 mSDsCounter, 0 mSdLazyCounter, 1507 mSolverCounterSat, 279 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 492.01ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 1786 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.33ms SdHoareTripleChecker+Time, 279 IncrementalHoareTripleChecker+Valid, 1507 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 635.41ms IncrementalHoareTripleChecker+Time [2021-08-29 16:31:48,043 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [145 Valid, 139 Invalid, 1786 Unknown, 0 Unchecked, 5.33ms Time], IncrementalHoareTripleChecker [279 Valid, 1507 Invalid, 0 Unknown, 0 Unchecked, 635.41ms Time] [2021-08-29 16:31:48,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-08-29 16:31:48,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 123. [2021-08-29 16:31:48,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 86 states have (on average 1.1162790697674418) internal successors, (96), 83 states have internal predecessors, (96), 22 states have call successors, (22), 16 states have call predecessors, (22), 14 states have return successors, (30), 23 states have call predecessors, (30), 22 states have call successors, (30) [2021-08-29 16:31:48,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 148 transitions. [2021-08-29 16:31:48,048 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 148 transitions. Word has length 217 [2021-08-29 16:31:48,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:31:48,048 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 148 transitions. [2021-08-29 16:31:48,048 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 2.875) internal successors, (92), 33 states have internal predecessors, (92), 19 states have call successors, (28), 1 states have call predecessors, (28), 15 states have return successors, (36), 25 states have call predecessors, (36), 19 states have call successors, (36) [2021-08-29 16:31:48,048 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 148 transitions. [2021-08-29 16:31:48,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2021-08-29 16:31:48,050 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:31:48,050 INFO L513 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 12, 11, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:31:48,069 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-08-29 16:31:48,264 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-08-29 16:31:48,265 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:31:48,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:31:48,265 INFO L82 PathProgramCache]: Analyzing trace with hash 1374317944, now seen corresponding path program 5 times [2021-08-29 16:31:48,265 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:31:48,265 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1803522820] [2021-08-29 16:31:48,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:48,265 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:31:48,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,301 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:31:48,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,321 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:48,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,333 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:48,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,344 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:48,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,358 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:48,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,362 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:48,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,364 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:48,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,365 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:48,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,367 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-29 16:31:48,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,368 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-08-29 16:31:48,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,408 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:48,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,410 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:48,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,412 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2021-08-29 16:31:48,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,427 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:48,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,435 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:48,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,437 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 91 [2021-08-29 16:31:48,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,444 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:48,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,446 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:48,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,447 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:48,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,449 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-29 16:31:48,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,450 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 132 [2021-08-29 16:31:48,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,455 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:48,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,457 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:48,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,459 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:48,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,460 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:48,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,461 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-08-29 16:31:48,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,462 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-08-29 16:31:48,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,464 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-08-29 16:31:48,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,465 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-08-29 16:31:48,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:31:48,467 INFO L134 CoverageAnalysis]: Checked inductivity of 1073 backedges. 155 proven. 209 refuted. 0 times theorem prover too weak. 709 trivial. 0 not checked. [2021-08-29 16:31:48,467 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:31:48,467 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1803522820] [2021-08-29 16:31:48,467 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1803522820] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:31:48,468 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1501049389] [2021-08-29 16:31:48,468 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-08-29 16:31:48,468 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:31:48,468 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:31:48,469 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:31:48,508 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-08-29 16:31:48,543 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-08-29 16:31:48,543 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-29 16:31:48,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 12 conjunts are in the unsatisfiable core [2021-08-29 16:31:48,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:31:48,862 INFO L134 CoverageAnalysis]: Checked inductivity of 1073 backedges. 638 proven. 46 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2021-08-29 16:31:48,863 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:31:49,757 INFO L134 CoverageAnalysis]: Checked inductivity of 1073 backedges. 143 proven. 256 refuted. 0 times theorem prover too weak. 674 trivial. 0 not checked. [2021-08-29 16:31:49,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1501049389] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:31:49,757 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:31:49,758 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 13] total 25 [2021-08-29 16:31:49,758 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569468004] [2021-08-29 16:31:49,758 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-08-29 16:31:49,758 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:31:49,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-08-29 16:31:49,759 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=510, Unknown=0, NotChecked=0, Total=600 [2021-08-29 16:31:49,759 INFO L87 Difference]: Start difference. First operand 123 states and 148 transitions. Second operand has 25 states, 24 states have (on average 3.8333333333333335) internal successors, (92), 25 states have internal predecessors, (92), 14 states have call successors, (29), 2 states have call predecessors, (29), 9 states have return successors, (33), 14 states have call predecessors, (33), 14 states have call successors, (33) [2021-08-29 16:31:50,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:31:50,042 INFO L93 Difference]: Finished difference Result 226 states and 275 transitions. [2021-08-29 16:31:50,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-08-29 16:31:50,043 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 3.8333333333333335) internal successors, (92), 25 states have internal predecessors, (92), 14 states have call successors, (29), 2 states have call predecessors, (29), 9 states have return successors, (33), 14 states have call predecessors, (33), 14 states have call successors, (33) Word has length 201 [2021-08-29 16:31:50,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:31:50,044 INFO L225 Difference]: With dead ends: 226 [2021-08-29 16:31:50,044 INFO L226 Difference]: Without dead ends: 106 [2021-08-29 16:31:50,044 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 447 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 240.96ms TimeCoverageRelationStatistics Valid=164, Invalid=828, Unknown=0, NotChecked=0, Total=992 [2021-08-29 16:31:50,045 INFO L928 BasicCegarLoop]: 7 mSDtfsCounter, 87 mSDsluCounter, 291 mSDsCounter, 0 mSdLazyCounter, 600 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 163.03ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 653 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.98ms SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 600 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 201.51ms IncrementalHoareTripleChecker+Time [2021-08-29 16:31:50,045 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 63 Invalid, 653 Unknown, 0 Unchecked, 1.98ms Time], IncrementalHoareTripleChecker [53 Valid, 600 Invalid, 0 Unknown, 0 Unchecked, 201.51ms Time] [2021-08-29 16:31:50,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-08-29 16:31:50,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2021-08-29 16:31:50,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 77 states have (on average 1.077922077922078) internal successors, (83), 72 states have internal predecessors, (83), 16 states have call successors, (16), 16 states have call predecessors, (16), 12 states have return successors, (18), 17 states have call predecessors, (18), 16 states have call successors, (18) [2021-08-29 16:31:50,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 117 transitions. [2021-08-29 16:31:50,051 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 117 transitions. Word has length 201 [2021-08-29 16:31:50,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:31:50,051 INFO L470 AbstractCegarLoop]: Abstraction has 106 states and 117 transitions. [2021-08-29 16:31:50,051 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 3.8333333333333335) internal successors, (92), 25 states have internal predecessors, (92), 14 states have call successors, (29), 2 states have call predecessors, (29), 9 states have return successors, (33), 14 states have call predecessors, (33), 14 states have call successors, (33) [2021-08-29 16:31:50,051 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 117 transitions. [2021-08-29 16:31:50,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-08-29 16:31:50,052 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:31:50,052 INFO L513 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 10, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:31:50,070 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-08-29 16:31:50,256 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-08-29 16:31:50,257 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:31:50,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:31:50,257 INFO L82 PathProgramCache]: Analyzing trace with hash 521886258, now seen corresponding path program 6 times [2021-08-29 16:31:50,257 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:31:50,257 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1489579583] [2021-08-29 16:31:50,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:31:50,257 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:31:50,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-29 16:31:50,271 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-29 16:31:50,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-29 16:31:50,316 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-29 16:31:50,317 INFO L627 BasicCegarLoop]: Counterexample is feasible [2021-08-29 16:31:50,317 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-08-29 16:31:50,319 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-08-29 16:31:50,323 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-08-29 16:31:50,395 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 29.08 04:31:50 BoogieIcfgContainer [2021-08-29 16:31:50,396 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-08-29 16:31:50,396 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-08-29 16:31:50,396 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-08-29 16:31:50,396 INFO L275 PluginConnector]: Witness Printer initialized [2021-08-29 16:31:50,396 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.08 04:31:32" (3/4) ... [2021-08-29 16:31:50,397 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-08-29 16:31:50,458 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2021-08-29 16:31:50,458 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-08-29 16:31:50,458 INFO L158 Benchmark]: Toolchain (without parser) took 18052.10ms. Allocated memory was 58.7MB in the beginning and 151.0MB in the end (delta: 92.3MB). Free memory was 37.7MB in the beginning and 85.0MB in the end (delta: -47.3MB). Peak memory consumption was 43.1MB. Max. memory is 16.1GB. [2021-08-29 16:31:50,458 INFO L158 Benchmark]: CDTParser took 0.34ms. Allocated memory is still 58.7MB. Free memory was 41.0MB in the beginning and 40.9MB in the end (delta: 43.2kB). There was no memory consumed. Max. memory is 16.1GB. [2021-08-29 16:31:50,458 INFO L158 Benchmark]: CACSL2BoogieTranslator took 153.73ms. Allocated memory is still 58.7MB. Free memory was 37.6MB in the beginning and 28.1MB in the end (delta: 9.5MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-08-29 16:31:50,459 INFO L158 Benchmark]: Boogie Procedure Inliner took 27.49ms. Allocated memory is still 58.7MB. Free memory was 28.1MB in the beginning and 42.9MB in the end (delta: -14.8MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2021-08-29 16:31:50,459 INFO L158 Benchmark]: Boogie Preprocessor took 23.54ms. Allocated memory is still 58.7MB. Free memory was 42.9MB in the beginning and 42.0MB in the end (delta: 955.2kB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-08-29 16:31:50,459 INFO L158 Benchmark]: RCFGBuilder took 191.24ms. Allocated memory is still 58.7MB. Free memory was 41.8MB in the beginning and 33.3MB in the end (delta: 8.5MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2021-08-29 16:31:50,460 INFO L158 Benchmark]: TraceAbstraction took 17588.16ms. Allocated memory was 58.7MB in the beginning and 151.0MB in the end (delta: 92.3MB). Free memory was 32.9MB in the beginning and 93.4MB in the end (delta: -60.5MB). Peak memory consumption was 33.8MB. Max. memory is 16.1GB. [2021-08-29 16:31:50,460 INFO L158 Benchmark]: Witness Printer took 61.92ms. Allocated memory is still 151.0MB. Free memory was 93.4MB in the beginning and 85.0MB in the end (delta: 8.4MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-08-29 16:31:50,461 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.34ms. Allocated memory is still 58.7MB. Free memory was 41.0MB in the beginning and 40.9MB in the end (delta: 43.2kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 153.73ms. Allocated memory is still 58.7MB. Free memory was 37.6MB in the beginning and 28.1MB in the end (delta: 9.5MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 27.49ms. Allocated memory is still 58.7MB. Free memory was 28.1MB in the beginning and 42.9MB in the end (delta: -14.8MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * Boogie Preprocessor took 23.54ms. Allocated memory is still 58.7MB. Free memory was 42.9MB in the beginning and 42.0MB in the end (delta: 955.2kB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 191.24ms. Allocated memory is still 58.7MB. Free memory was 41.8MB in the beginning and 33.3MB in the end (delta: 8.5MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * TraceAbstraction took 17588.16ms. Allocated memory was 58.7MB in the beginning and 151.0MB in the end (delta: 92.3MB). Free memory was 32.9MB in the beginning and 93.4MB in the end (delta: -60.5MB). Peak memory consumption was 33.8MB. Max. memory is 16.1GB. * Witness Printer took 61.92ms. Allocated memory is still 151.0MB. Free memory was 93.4MB in the beginning and 85.0MB in the end (delta: 8.4MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.00ms ErrorAutomatonConstructionTimeTotal, 0.00ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.00ms ErrorAutomatonConstructionTimeAvg, 0.00ms ErrorAutomatonDifferenceTimeAvg, 0.00ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 41]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L38] int x = 6; [L39] CALL, EXPR fibo1(x) VAL [\old(n)=6] [L10] COND FALSE !(n < 1) VAL [\old(n)=6, n=6] [L12] COND FALSE !(n == 1) VAL [\old(n)=6, n=6] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=5] [L20] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L22] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L25] CALL, EXPR fibo1(n-1) 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); [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=5, fibo1(n-1)=3, n=5] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=3] [L10] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L12] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L15] CALL, EXPR fibo2(n-1) 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-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L15] CALL, EXPR fibo2(n-2) 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-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L15] return fibo2(n-1) + fibo2(n-2); [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=5, fibo1(n-1)=3, fibo1(n-2)=2, n=5] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=6, fibo2(n-1)=5, n=6] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=4] [L20] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L22] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=3] [L10] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L12] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L15] CALL, EXPR fibo2(n-1) 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-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L15] CALL, EXPR fibo2(n-2) 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-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L15] return fibo2(n-1) + fibo2(n-2); [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=4, fibo1(n-1)=2, n=4] [L25] CALL, EXPR fibo1(n-2) 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-2) VAL [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=6, fibo2(n-1)=5, fibo2(n-2)=3, n=6] [L15] return fibo2(n-1) + fibo2(n-2); [L39] RET, EXPR fibo1(x) [L39] int result = fibo1(x); [L40] COND TRUE result == 8 [L41] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 29 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 17461.47ms, OverallIterations: 14, TraceHistogramMax: 17, EmptinessCheckTime: 34.64ms, AutomataDifference: 4161.27ms, DeadEndRemovalTime: 0.00ms, HoareAnnotationTime: 0.00ms, InitialAbstractionConstructionTime: 13.24ms, PartialOrderReductionTime: 0.00ms, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 924 SdHoareTripleChecker+Valid, 2982.75ms IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 858 mSDsluCounter, 780 SdHoareTripleChecker+Invalid, 2336.10ms Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 2704 mSDsCounter, 989 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 6823 IncrementalHoareTripleChecker+Invalid, 7812 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 989 mSolverCounterUnsat, 118 mSDtfsCounter, 6823 mSolverCounterSat, 41.70ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 2869 GetRequests, 2540 SyntacticMatches, 19 SemanticMatches, 310 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2150 ImplicationChecksByTransitivity, 2086.12ms Time, 0.00ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=123occurred in iteration=12, InterpolantAutomatonStates: 233, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.00ms DumpTime, AutomataMinimizationStatistics: 137.15ms AutomataMinimizationTime, 13 MinimizatonAttempts, 142 StatesRemovedByMinimization, 10 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 100.00ms SsaConstructionTime, 362.46ms SatisfiabilityAnalysisTime, 9747.79ms InterpolantComputationTime, 2499 NumberOfCodeBlocks, 2231 NumberOfCodeBlocksAsserted, 32 NumberOfCheckSat, 3442 ConstructedInterpolants, 0 QuantifiedInterpolants, 5840 SizeOfPredicates, 40 NumberOfNonLiveVariables, 2211 ConjunctsInSsa, 102 ConjunctsInUnsatCore, 35 InterpolantComputations, 2 PerfectInterpolantSequences, 10983/13626 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-08-29 16:31:50,498 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...