./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version ff03de63 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 22d9a6832a4080412e38f5d573b63985f3b10b3c2009b6559595c7c0bbda414f --- Real Ultimate output --- This is Ultimate 0.2.2-dev-ff03de6 [2021-12-21 13:19:04,514 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-21 13:19:04,539 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-21 13:19:04,576 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-21 13:19:04,577 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-21 13:19:04,583 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-21 13:19:04,584 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-21 13:19:04,586 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-21 13:19:04,588 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-21 13:19:04,591 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-21 13:19:04,592 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-21 13:19:04,593 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-21 13:19:04,593 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-21 13:19:04,595 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-21 13:19:04,596 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-21 13:19:04,599 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-21 13:19:04,599 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-21 13:19:04,600 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-21 13:19:04,601 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-21 13:19:04,606 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-21 13:19:04,607 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-21 13:19:04,607 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-21 13:19:04,609 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-21 13:19:04,609 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-21 13:19:04,614 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-21 13:19:04,614 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-21 13:19:04,614 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-21 13:19:04,616 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-21 13:19:04,616 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-21 13:19:04,617 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-21 13:19:04,617 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-21 13:19:04,617 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-21 13:19:04,619 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-21 13:19:04,619 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-21 13:19:04,620 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-21 13:19:04,620 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-21 13:19:04,621 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-21 13:19:04,621 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-21 13:19:04,621 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-21 13:19:04,622 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-21 13:19:04,623 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-21 13:19:04,624 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-21 13:19:04,653 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-21 13:19:04,653 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-21 13:19:04,654 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-21 13:19:04,654 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-21 13:19:04,655 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-21 13:19:04,655 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-21 13:19:04,655 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-21 13:19:04,655 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-21 13:19:04,656 INFO L138 SettingsManager]: * Use SBE=true [2021-12-21 13:19:04,656 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-21 13:19:04,656 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-21 13:19:04,657 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-21 13:19:04,657 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-21 13:19:04,657 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-21 13:19:04,657 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-21 13:19:04,657 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-21 13:19:04,658 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-21 13:19:04,658 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-21 13:19:04,658 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-21 13:19:04,658 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-21 13:19:04,658 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-21 13:19:04,658 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-21 13:19:04,658 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-21 13:19:04,659 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-21 13:19:04,659 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 13:19:04,659 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-21 13:19:04,659 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-21 13:19:04,659 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-21 13:19:04,659 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-21 13:19:04,660 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-21 13:19:04,660 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-21 13:19:04,660 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-21 13:19:04,660 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-21 13:19:04,660 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-21 13:19:04,660 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 22d9a6832a4080412e38f5d573b63985f3b10b3c2009b6559595c7c0bbda414f [2021-12-21 13:19:04,824 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-21 13:19:04,842 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-21 13:19:04,845 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-21 13:19:04,846 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-21 13:19:04,846 INFO L275 PluginConnector]: CDTParser initialized [2021-12-21 13:19:04,847 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c [2021-12-21 13:19:04,899 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e47d55027/613a9b5c96ac4d6dad928077f0e0a9c5/FLAGa1ccb6dc7 [2021-12-21 13:19:05,244 INFO L306 CDTParser]: Found 1 translation units. [2021-12-21 13:19:05,245 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c [2021-12-21 13:19:05,250 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e47d55027/613a9b5c96ac4d6dad928077f0e0a9c5/FLAGa1ccb6dc7 [2021-12-21 13:19:05,259 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e47d55027/613a9b5c96ac4d6dad928077f0e0a9c5 [2021-12-21 13:19:05,260 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-21 13:19:05,261 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-21 13:19:05,262 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-21 13:19:05,262 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-21 13:19:05,264 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-21 13:19:05,265 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 01:19:05" (1/1) ... [2021-12-21 13:19:05,266 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d0de6c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:19:05, skipping insertion in model container [2021-12-21 13:19:05,266 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 01:19:05" (1/1) ... [2021-12-21 13:19:05,270 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-21 13:19:05,277 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-21 13:19:05,378 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c[946,959] [2021-12-21 13:19:05,397 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 13:19:05,402 INFO L203 MainTranslator]: Completed pre-run [2021-12-21 13:19:05,419 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c[946,959] [2021-12-21 13:19:05,420 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 13:19:05,430 INFO L208 MainTranslator]: Completed translation [2021-12-21 13:19:05,431 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:19:05 WrapperNode [2021-12-21 13:19:05,431 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-21 13:19:05,432 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-21 13:19:05,432 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-21 13:19:05,432 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-21 13:19:05,437 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:19:05" (1/1) ... [2021-12-21 13:19:05,442 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:19:05" (1/1) ... [2021-12-21 13:19:05,458 INFO L137 Inliner]: procedures = 14, calls = 12, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 21 [2021-12-21 13:19:05,458 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-21 13:19:05,459 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-21 13:19:05,459 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-21 13:19:05,459 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-21 13:19:05,463 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:19:05" (1/1) ... [2021-12-21 13:19:05,463 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:19:05" (1/1) ... [2021-12-21 13:19:05,464 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:19:05" (1/1) ... [2021-12-21 13:19:05,464 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:19:05" (1/1) ... [2021-12-21 13:19:05,474 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:19:05" (1/1) ... [2021-12-21 13:19:05,475 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:19:05" (1/1) ... [2021-12-21 13:19:05,477 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:19:05" (1/1) ... [2021-12-21 13:19:05,481 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-21 13:19:05,482 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-21 13:19:05,482 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-21 13:19:05,482 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-21 13:19:05,483 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:19:05" (1/1) ... [2021-12-21 13:19:05,487 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 13:19:05,494 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 13:19:05,503 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) [2021-12-21 13:19:05,509 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 [2021-12-21 13:19:05,532 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-21 13:19:05,532 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-21 13:19:05,532 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2021-12-21 13:19:05,533 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2021-12-21 13:19:05,533 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2021-12-21 13:19:05,533 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2021-12-21 13:19:05,533 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-21 13:19:05,533 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-21 13:19:05,570 INFO L234 CfgBuilder]: Building ICFG [2021-12-21 13:19:05,571 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-21 13:19:05,660 INFO L275 CfgBuilder]: Performing block encoding [2021-12-21 13:19:05,665 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-21 13:19:05,671 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-12-21 13:19:05,673 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 01:19:05 BoogieIcfgContainer [2021-12-21 13:19:05,673 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-21 13:19:05,677 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-21 13:19:05,690 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-21 13:19:05,693 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-21 13:19:05,693 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 01:19:05" (1/3) ... [2021-12-21 13:19:05,694 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7eefa980 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 01:19:05, skipping insertion in model container [2021-12-21 13:19:05,694 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:19:05" (2/3) ... [2021-12-21 13:19:05,694 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7eefa980 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 01:19:05, skipping insertion in model container [2021-12-21 13:19:05,694 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 01:19:05" (3/3) ... [2021-12-21 13:19:05,695 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_2calls_4-2.c [2021-12-21 13:19:05,698 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-21 13:19:05,698 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-21 13:19:05,737 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-21 13:19:05,747 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, mAutomataTypeConcurrency=PETRI_NET, 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 [2021-12-21 13:19:05,747 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-21 13:19:05,758 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) [2021-12-21 13:19:05,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-12-21 13:19:05,761 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 13:19:05,761 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 13:19:05,761 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 13:19:05,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 13:19:05,765 INFO L85 PathProgramCache]: Analyzing trace with hash 1123300790, now seen corresponding path program 1 times [2021-12-21 13:19:05,771 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 13:19:05,772 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2089751441] [2021-12-21 13:19:05,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:19:05,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 13:19:05,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:05,926 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:19:05,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:05,954 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 13:19:05,955 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 13:19:05,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2089751441] [2021-12-21 13:19:05,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2089751441] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 13:19:05,956 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 13:19:05,956 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-21 13:19:05,957 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864811432] [2021-12-21 13:19:05,957 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 13:19:05,960 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 13:19:05,960 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 13:19:05,996 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 13:19:05,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-21 13:19:05,998 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) [2021-12-21 13:19:06,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 13:19:06,034 INFO L93 Difference]: Finished difference Result 43 states and 51 transitions. [2021-12-21 13:19:06,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-21 13:19:06,039 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 [2021-12-21 13:19:06,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 13:19:06,044 INFO L225 Difference]: With dead ends: 43 [2021-12-21 13:19:06,044 INFO L226 Difference]: Without dead ends: 27 [2021-12-21 13:19:06,046 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-21 13:19:06,049 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 4 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 13:19:06,050 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 126 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 13:19:06,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-12-21 13:19:06,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-12-21 13:19:06,085 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) [2021-12-21 13:19:06,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2021-12-21 13:19:06,088 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 10 [2021-12-21 13:19:06,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 13:19:06,088 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2021-12-21 13:19:06,089 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) [2021-12-21 13:19:06,089 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2021-12-21 13:19:06,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-21 13:19:06,091 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 13:19:06,091 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 13:19:06,091 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-21 13:19:06,092 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 13:19:06,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 13:19:06,101 INFO L85 PathProgramCache]: Analyzing trace with hash 1177745932, now seen corresponding path program 1 times [2021-12-21 13:19:06,101 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 13:19:06,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1649799422] [2021-12-21 13:19:06,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:19:06,102 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 13:19:06,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:06,157 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:19:06,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:06,186 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 13:19:06,187 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 13:19:06,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1649799422] [2021-12-21 13:19:06,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1649799422] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 13:19:06,188 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 13:19:06,188 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-21 13:19:06,188 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1649671264] [2021-12-21 13:19:06,188 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 13:19:06,190 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 13:19:06,191 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 13:19:06,192 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 13:19:06,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-21 13:19:06,193 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) [2021-12-21 13:19:06,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 13:19:06,215 INFO L93 Difference]: Finished difference Result 33 states and 41 transitions. [2021-12-21 13:19:06,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-21 13:19:06,216 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 [2021-12-21 13:19:06,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 13:19:06,217 INFO L225 Difference]: With dead ends: 33 [2021-12-21 13:19:06,218 INFO L226 Difference]: Without dead ends: 29 [2021-12-21 13:19:06,218 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-21 13:19:06,219 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 0 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 13:19:06,220 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 125 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 13:19:06,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-12-21 13:19:06,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2021-12-21 13:19:06,225 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) [2021-12-21 13:19:06,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2021-12-21 13:19:06,227 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 11 [2021-12-21 13:19:06,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 13:19:06,227 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2021-12-21 13:19:06,228 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) [2021-12-21 13:19:06,228 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2021-12-21 13:19:06,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-12-21 13:19:06,230 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 13:19:06,230 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 13:19:06,231 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-21 13:19:06,235 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 13:19:06,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 13:19:06,236 INFO L85 PathProgramCache]: Analyzing trace with hash 2110588723, now seen corresponding path program 1 times [2021-12-21 13:19:06,237 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 13:19:06,237 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [936316069] [2021-12-21 13:19:06,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:19:06,238 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 13:19:06,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:06,291 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:19:06,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:06,327 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:19:06,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:06,358 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-21 13:19:06,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:06,362 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 13:19:06,363 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 13:19:06,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [936316069] [2021-12-21 13:19:06,364 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [936316069] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 13:19:06,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [282059812] [2021-12-21 13:19:06,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:19:06,366 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 13:19:06,366 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 13:19:06,368 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) [2021-12-21 13:19:06,369 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-21 13:19:06,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:06,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-21 13:19:06,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 13:19:06,558 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 13:19:06,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 13:19:06,752 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 13:19:06,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [282059812] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 13:19:06,752 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 13:19:06,752 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 13 [2021-12-21 13:19:06,753 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755385026] [2021-12-21 13:19:06,753 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 13:19:06,753 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-21 13:19:06,753 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 13:19:06,754 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-21 13:19:06,754 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-12-21 13:19:06,754 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) [2021-12-21 13:19:06,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 13:19:06,927 INFO L93 Difference]: Finished difference Result 55 states and 75 transitions. [2021-12-21 13:19:06,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-21 13:19:06,928 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 [2021-12-21 13:19:06,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 13:19:06,929 INFO L225 Difference]: With dead ends: 55 [2021-12-21 13:19:06,929 INFO L226 Difference]: Without dead ends: 31 [2021-12-21 13:19:06,929 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 43 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2021-12-21 13:19:06,930 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 32 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 13:19:06,930 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 141 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 13:19:06,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-12-21 13:19:06,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2021-12-21 13:19:06,934 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) [2021-12-21 13:19:06,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2021-12-21 13:19:06,935 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 23 [2021-12-21 13:19:06,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 13:19:06,935 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2021-12-21 13:19:06,935 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) [2021-12-21 13:19:06,935 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2021-12-21 13:19:06,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-12-21 13:19:06,936 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 13:19:06,936 INFO L514 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] [2021-12-21 13:19:06,953 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-21 13:19:07,151 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 [2021-12-21 13:19:07,152 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 13:19:07,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 13:19:07,152 INFO L85 PathProgramCache]: Analyzing trace with hash 1277869167, now seen corresponding path program 1 times [2021-12-21 13:19:07,152 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 13:19:07,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1150232723] [2021-12-21 13:19:07,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:19:07,153 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 13:19:07,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:07,189 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:19:07,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:07,213 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:19:07,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:07,241 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-12-21 13:19:07,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:07,247 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 13:19:07,247 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 13:19:07,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1150232723] [2021-12-21 13:19:07,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1150232723] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 13:19:07,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1885479666] [2021-12-21 13:19:07,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:19:07,248 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 13:19:07,248 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 13:19:07,254 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) [2021-12-21 13:19:07,258 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-21 13:19:07,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:07,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-21 13:19:07,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 13:19:07,347 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 13:19:07,348 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 13:19:07,489 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 13:19:07,489 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1885479666] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 13:19:07,490 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 13:19:07,490 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 13 [2021-12-21 13:19:07,490 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138116470] [2021-12-21 13:19:07,490 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 13:19:07,491 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-21 13:19:07,491 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 13:19:07,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-21 13:19:07,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2021-12-21 13:19:07,492 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) [2021-12-21 13:19:07,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 13:19:07,605 INFO L93 Difference]: Finished difference Result 51 states and 71 transitions. [2021-12-21 13:19:07,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-21 13:19:07,606 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 [2021-12-21 13:19:07,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 13:19:07,607 INFO L225 Difference]: With dead ends: 51 [2021-12-21 13:19:07,607 INFO L226 Difference]: Without dead ends: 47 [2021-12-21 13:19:07,608 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2021-12-21 13:19:07,608 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 32 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 13:19:07,609 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 120 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 171 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 13:19:07,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-12-21 13:19:07,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 45. [2021-12-21 13:19:07,614 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) [2021-12-21 13:19:07,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 62 transitions. [2021-12-21 13:19:07,615 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 62 transitions. Word has length 24 [2021-12-21 13:19:07,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 13:19:07,615 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 62 transitions. [2021-12-21 13:19:07,615 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) [2021-12-21 13:19:07,616 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 62 transitions. [2021-12-21 13:19:07,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-12-21 13:19:07,616 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 13:19:07,617 INFO L514 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] [2021-12-21 13:19:07,637 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-21 13:19:07,827 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 [2021-12-21 13:19:07,828 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 13:19:07,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 13:19:07,828 INFO L85 PathProgramCache]: Analyzing trace with hash -2061621832, now seen corresponding path program 1 times [2021-12-21 13:19:07,828 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 13:19:07,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [149577969] [2021-12-21 13:19:07,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:19:07,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 13:19:07,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:07,858 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:19:07,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:07,869 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:19:07,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:07,883 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:19:07,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:07,895 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-21 13:19:07,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:07,899 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-12-21 13:19:07,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:07,902 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-21 13:19:07,902 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 13:19:07,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [149577969] [2021-12-21 13:19:07,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [149577969] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 13:19:07,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [500785888] [2021-12-21 13:19:07,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:19:07,903 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 13:19:07,903 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 13:19:07,904 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) [2021-12-21 13:19:07,905 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-21 13:19:07,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:07,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-21 13:19:07,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 13:19:08,068 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-21 13:19:08,068 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 13:19:08,368 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-21 13:19:08,369 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [500785888] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 13:19:08,369 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 13:19:08,369 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 9] total 15 [2021-12-21 13:19:08,369 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1397575222] [2021-12-21 13:19:08,369 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 13:19:08,370 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-21 13:19:08,370 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 13:19:08,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-21 13:19:08,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-12-21 13:19:08,371 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) [2021-12-21 13:19:08,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 13:19:08,553 INFO L93 Difference]: Finished difference Result 105 states and 167 transitions. [2021-12-21 13:19:08,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-21 13:19:08,554 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 [2021-12-21 13:19:08,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 13:19:08,555 INFO L225 Difference]: With dead ends: 105 [2021-12-21 13:19:08,555 INFO L226 Difference]: Without dead ends: 63 [2021-12-21 13:19:08,556 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 75 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2021-12-21 13:19:08,556 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 65 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 170 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 220 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 170 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 13:19:08,559 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 118 Invalid, 220 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 170 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 13:19:08,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-12-21 13:19:08,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-12-21 13:19:08,579 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) [2021-12-21 13:19:08,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 92 transitions. [2021-12-21 13:19:08,582 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 92 transitions. Word has length 36 [2021-12-21 13:19:08,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 13:19:08,582 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 92 transitions. [2021-12-21 13:19:08,583 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) [2021-12-21 13:19:08,583 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 92 transitions. [2021-12-21 13:19:08,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-12-21 13:19:08,587 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 13:19:08,587 INFO L514 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] [2021-12-21 13:19:08,609 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-21 13:19:08,799 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 [2021-12-21 13:19:08,799 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 13:19:08,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 13:19:08,800 INFO L85 PathProgramCache]: Analyzing trace with hash 1167294498, now seen corresponding path program 1 times [2021-12-21 13:19:08,800 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 13:19:08,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1198724203] [2021-12-21 13:19:08,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:19:08,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 13:19:08,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:08,816 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:19:08,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:08,830 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:19:08,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:08,855 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:19:08,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:08,859 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-12-21 13:19:08,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:08,862 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-12-21 13:19:08,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:08,870 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-12-21 13:19:08,871 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 13:19:08,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1198724203] [2021-12-21 13:19:08,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1198724203] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 13:19:08,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [963649343] [2021-12-21 13:19:08,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:19:08,871 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 13:19:08,871 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 13:19:08,872 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) [2021-12-21 13:19:08,873 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-21 13:19:08,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:08,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-21 13:19:08,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 13:19:08,994 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-21 13:19:08,994 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 13:19:09,257 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-21 13:19:09,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [963649343] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 13:19:09,257 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 13:19:09,257 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9] total 17 [2021-12-21 13:19:09,258 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903685457] [2021-12-21 13:19:09,258 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 13:19:09,258 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-21 13:19:09,258 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 13:19:09,259 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-21 13:19:09,259 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-12-21 13:19:09,259 INFO L87 Difference]: Start difference. First operand 63 states and 92 transitions. Second operand has 17 states, 16 states have (on average 3.0625) internal successors, (49), 17 states have internal predecessors, (49), 10 states have call successors, (12), 1 states have call predecessors, (12), 7 states have return successors, (12), 6 states have call predecessors, (12), 10 states have call successors, (12) [2021-12-21 13:19:09,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 13:19:09,514 INFO L93 Difference]: Finished difference Result 177 states and 321 transitions. [2021-12-21 13:19:09,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-12-21 13:19:09,515 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 3.0625) internal successors, (49), 17 states have internal predecessors, (49), 10 states have call successors, (12), 1 states have call predecessors, (12), 7 states have return successors, (12), 6 states have call predecessors, (12), 10 states have call successors, (12) Word has length 37 [2021-12-21 13:19:09,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 13:19:09,520 INFO L225 Difference]: With dead ends: 177 [2021-12-21 13:19:09,520 INFO L226 Difference]: Without dead ends: 117 [2021-12-21 13:19:09,525 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 80 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=117, Invalid=483, Unknown=0, NotChecked=0, Total=600 [2021-12-21 13:19:09,528 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 53 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 383 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 257 SdHoareTripleChecker+Invalid, 454 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 383 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 13:19:09,528 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 257 Invalid, 454 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 383 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 13:19:09,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-12-21 13:19:09,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 103. [2021-12-21 13:19:09,546 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) [2021-12-21 13:19:09,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 166 transitions. [2021-12-21 13:19:09,551 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 166 transitions. Word has length 37 [2021-12-21 13:19:09,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 13:19:09,552 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 166 transitions. [2021-12-21 13:19:09,552 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 3.0625) internal successors, (49), 17 states have internal predecessors, (49), 10 states have call successors, (12), 1 states have call predecessors, (12), 7 states have return successors, (12), 6 states have call predecessors, (12), 10 states have call successors, (12) [2021-12-21 13:19:09,552 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 166 transitions. [2021-12-21 13:19:09,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-12-21 13:19:09,558 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 13:19:09,558 INFO L514 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] [2021-12-21 13:19:09,575 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-21 13:19:09,773 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 [2021-12-21 13:19:09,773 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 13:19:09,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 13:19:09,774 INFO L85 PathProgramCache]: Analyzing trace with hash 384535367, now seen corresponding path program 1 times [2021-12-21 13:19:09,774 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 13:19:09,774 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [124942762] [2021-12-21 13:19:09,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:19:09,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 13:19:09,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:09,804 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:19:09,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:09,828 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:19:09,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:09,840 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:19:09,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:09,889 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:19:09,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:09,893 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-12-21 13:19:09,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:09,910 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-12-21 13:19:09,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:09,922 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2021-12-21 13:19:09,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:09,927 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-12-21 13:19:09,928 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 13:19:09,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [124942762] [2021-12-21 13:19:09,928 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [124942762] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 13:19:09,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [960128815] [2021-12-21 13:19:09,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:19:09,928 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 13:19:09,929 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 13:19:09,929 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) [2021-12-21 13:19:09,946 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-21 13:19:09,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:09,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-21 13:19:09,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 13:19:10,079 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-12-21 13:19:10,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 13:19:10,347 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 13 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-12-21 13:19:10,347 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [960128815] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 13:19:10,347 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 13:19:10,347 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9] total 16 [2021-12-21 13:19:10,348 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [597109836] [2021-12-21 13:19:10,348 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 13:19:10,348 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-21 13:19:10,348 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 13:19:10,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-21 13:19:10,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2021-12-21 13:19:10,349 INFO L87 Difference]: Start difference. First operand 103 states and 166 transitions. Second operand has 16 states, 15 states have (on average 3.533333333333333) internal successors, (53), 16 states have internal predecessors, (53), 10 states have call successors, (15), 1 states have call predecessors, (15), 6 states have return successors, (17), 9 states have call predecessors, (17), 10 states have call successors, (17) [2021-12-21 13:19:10,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 13:19:10,557 INFO L93 Difference]: Finished difference Result 262 states and 508 transitions. [2021-12-21 13:19:10,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-21 13:19:10,558 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 3.533333333333333) internal successors, (53), 16 states have internal predecessors, (53), 10 states have call successors, (15), 1 states have call predecessors, (15), 6 states have return successors, (17), 9 states have call predecessors, (17), 10 states have call successors, (17) Word has length 51 [2021-12-21 13:19:10,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 13:19:10,561 INFO L225 Difference]: With dead ends: 262 [2021-12-21 13:19:10,561 INFO L226 Difference]: Without dead ends: 162 [2021-12-21 13:19:10,562 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 111 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=96, Invalid=366, Unknown=0, NotChecked=0, Total=462 [2021-12-21 13:19:10,563 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 41 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 273 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 183 SdHoareTripleChecker+Invalid, 316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 13:19:10,564 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 183 Invalid, 316 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 273 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 13:19:10,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-12-21 13:19:10,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 139. [2021-12-21 13:19:10,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 89 states have (on average 1.202247191011236) internal successors, (107), 91 states have internal predecessors, (107), 31 states have call successors, (31), 10 states have call predecessors, (31), 18 states have return successors, (103), 37 states have call predecessors, (103), 31 states have call successors, (103) [2021-12-21 13:19:10,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 241 transitions. [2021-12-21 13:19:10,587 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 241 transitions. Word has length 51 [2021-12-21 13:19:10,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 13:19:10,587 INFO L470 AbstractCegarLoop]: Abstraction has 139 states and 241 transitions. [2021-12-21 13:19:10,588 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 3.533333333333333) internal successors, (53), 16 states have internal predecessors, (53), 10 states have call successors, (15), 1 states have call predecessors, (15), 6 states have return successors, (17), 9 states have call predecessors, (17), 10 states have call successors, (17) [2021-12-21 13:19:10,588 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 241 transitions. [2021-12-21 13:19:10,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-12-21 13:19:10,589 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 13:19:10,589 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 13:19:10,606 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-21 13:19:10,799 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 [2021-12-21 13:19:10,800 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 13:19:10,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 13:19:10,800 INFO L85 PathProgramCache]: Analyzing trace with hash -1130362923, now seen corresponding path program 1 times [2021-12-21 13:19:10,800 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 13:19:10,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [461489111] [2021-12-21 13:19:10,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:19:10,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 13:19:10,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:10,818 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:19:10,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:10,833 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:19:10,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:10,855 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:19:10,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:10,887 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:19:10,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:10,891 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-12-21 13:19:10,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:10,894 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-12-21 13:19:10,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:10,897 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-12-21 13:19:10,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:10,907 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 19 proven. 11 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-12-21 13:19:10,908 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 13:19:10,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [461489111] [2021-12-21 13:19:10,908 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [461489111] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 13:19:10,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1952682706] [2021-12-21 13:19:10,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:19:10,908 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 13:19:10,908 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 13:19:10,909 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) [2021-12-21 13:19:10,910 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-21 13:19:10,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:10,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-21 13:19:10,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 13:19:11,048 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 18 proven. 5 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-12-21 13:19:11,048 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 13:19:11,225 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 18 proven. 5 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-12-21 13:19:11,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1952682706] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 13:19:11,226 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 13:19:11,226 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7, 7] total 17 [2021-12-21 13:19:11,226 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [199509998] [2021-12-21 13:19:11,226 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 13:19:11,227 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-21 13:19:11,227 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 13:19:11,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-21 13:19:11,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-12-21 13:19:11,228 INFO L87 Difference]: Start difference. First operand 139 states and 241 transitions. Second operand has 17 states, 16 states have (on average 3.3125) internal successors, (53), 17 states have internal predecessors, (53), 8 states have call successors, (14), 1 states have call predecessors, (14), 6 states have return successors, (16), 10 states have call predecessors, (16), 8 states have call successors, (16) [2021-12-21 13:19:11,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 13:19:11,414 INFO L93 Difference]: Finished difference Result 301 states and 580 transitions. [2021-12-21 13:19:11,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-12-21 13:19:11,415 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 3.3125) internal successors, (53), 17 states have internal predecessors, (53), 8 states have call successors, (14), 1 states have call predecessors, (14), 6 states have return successors, (16), 10 states have call predecessors, (16), 8 states have call successors, (16) Word has length 52 [2021-12-21 13:19:11,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 13:19:11,416 INFO L225 Difference]: With dead ends: 301 [2021-12-21 13:19:11,416 INFO L226 Difference]: Without dead ends: 98 [2021-12-21 13:19:11,417 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 111 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=92, Invalid=370, Unknown=0, NotChecked=0, Total=462 [2021-12-21 13:19:11,418 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 80 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 238 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 238 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 13:19:11,418 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 147 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 238 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 13:19:11,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-12-21 13:19:11,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 80. [2021-12-21 13:19:11,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 52 states have (on average 1.1730769230769231) internal successors, (61), 54 states have internal predecessors, (61), 16 states have call successors, (16), 6 states have call predecessors, (16), 11 states have return successors, (46), 19 states have call predecessors, (46), 16 states have call successors, (46) [2021-12-21 13:19:11,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 123 transitions. [2021-12-21 13:19:11,426 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 123 transitions. Word has length 52 [2021-12-21 13:19:11,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 13:19:11,426 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 123 transitions. [2021-12-21 13:19:11,426 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 3.3125) internal successors, (53), 17 states have internal predecessors, (53), 8 states have call successors, (14), 1 states have call predecessors, (14), 6 states have return successors, (16), 10 states have call predecessors, (16), 8 states have call successors, (16) [2021-12-21 13:19:11,427 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 123 transitions. [2021-12-21 13:19:11,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-12-21 13:19:11,431 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 13:19:11,431 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 13:19:11,453 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-21 13:19:11,647 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 [2021-12-21 13:19:11,647 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 13:19:11,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 13:19:11,648 INFO L85 PathProgramCache]: Analyzing trace with hash -492645000, now seen corresponding path program 2 times [2021-12-21 13:19:11,648 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 13:19:11,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1399359554] [2021-12-21 13:19:11,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:19:11,648 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 13:19:11,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:11,667 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:19:11,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:11,681 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:19:11,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:11,704 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:19:11,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:11,729 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:19:11,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:11,738 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-12-21 13:19:11,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:11,742 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-12-21 13:19:11,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:11,747 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-12-21 13:19:11,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:11,758 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:19:11,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:11,769 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-12-21 13:19:11,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:19:11,788 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 37 proven. 23 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-12-21 13:19:11,788 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 13:19:11,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1399359554] [2021-12-21 13:19:11,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1399359554] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 13:19:11,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1578806571] [2021-12-21 13:19:11,789 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 13:19:11,789 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 13:19:11,789 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 13:19:11,804 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) [2021-12-21 13:19:11,805 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-21 13:19:11,843 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 13:19:11,843 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 13:19:11,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-21 13:19:11,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 13:19:11,980 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 38 proven. 8 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-12-21 13:19:11,981 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 13:19:12,271 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 38 proven. 9 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-12-21 13:19:12,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1578806571] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 13:19:12,272 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 13:19:12,272 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 8, 9] total 22 [2021-12-21 13:19:12,274 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965853804] [2021-12-21 13:19:12,274 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 13:19:12,275 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-12-21 13:19:12,275 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 13:19:12,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-12-21 13:19:12,275 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=389, Unknown=0, NotChecked=0, Total=462 [2021-12-21 13:19:12,276 INFO L87 Difference]: Start difference. First operand 80 states and 123 transitions. Second operand has 22 states, 21 states have (on average 3.2857142857142856) internal successors, (69), 22 states have internal predecessors, (69), 12 states have call successors, (19), 1 states have call predecessors, (19), 9 states have return successors, (22), 14 states have call predecessors, (22), 12 states have call successors, (22) [2021-12-21 13:19:12,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 13:19:12,538 INFO L93 Difference]: Finished difference Result 171 states and 290 transitions. [2021-12-21 13:19:12,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-12-21 13:19:12,539 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 3.2857142857142856) internal successors, (69), 22 states have internal predecessors, (69), 12 states have call successors, (19), 1 states have call predecessors, (19), 9 states have return successors, (22), 14 states have call predecessors, (22), 12 states have call successors, (22) Word has length 66 [2021-12-21 13:19:12,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 13:19:12,540 INFO L225 Difference]: With dead ends: 171 [2021-12-21 13:19:12,540 INFO L226 Difference]: Without dead ends: 86 [2021-12-21 13:19:12,541 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 142 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=161, Invalid=769, Unknown=0, NotChecked=0, Total=930 [2021-12-21 13:19:12,541 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 78 mSDsluCounter, 181 mSDsCounter, 0 mSdLazyCounter, 353 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 426 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 353 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 13:19:12,541 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 209 Invalid, 426 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 353 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 13:19:12,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-12-21 13:19:12,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 77. [2021-12-21 13:19:12,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 53 states have (on average 1.150943396226415) internal successors, (61), 52 states have internal predecessors, (61), 12 states have call successors, (12), 8 states have call predecessors, (12), 11 states have return successors, (31), 16 states have call predecessors, (31), 12 states have call successors, (31) [2021-12-21 13:19:12,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 104 transitions. [2021-12-21 13:19:12,546 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 104 transitions. Word has length 66 [2021-12-21 13:19:12,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 13:19:12,546 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 104 transitions. [2021-12-21 13:19:12,546 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 3.2857142857142856) internal successors, (69), 22 states have internal predecessors, (69), 12 states have call successors, (19), 1 states have call predecessors, (19), 9 states have return successors, (22), 14 states have call predecessors, (22), 12 states have call successors, (22) [2021-12-21 13:19:12,546 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 104 transitions. [2021-12-21 13:19:12,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-12-21 13:19:12,547 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 13:19:12,547 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 13:19:12,567 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-12-21 13:19:12,753 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 [2021-12-21 13:19:12,754 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 13:19:12,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 13:19:12,754 INFO L85 PathProgramCache]: Analyzing trace with hash 780870354, now seen corresponding path program 1 times [2021-12-21 13:19:12,754 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 13:19:12,754 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [595644491] [2021-12-21 13:19:12,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:19:12,754 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 13:19:12,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-12-21 13:19:12,763 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-12-21 13:19:12,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-12-21 13:19:12,780 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-12-21 13:19:12,781 INFO L628 BasicCegarLoop]: Counterexample is feasible [2021-12-21 13:19:12,781 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-12-21 13:19:12,783 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-12-21 13:19:12,785 INFO L732 BasicCegarLoop]: Path program histogram: [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 13:19:12,787 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-12-21 13:19:12,811 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.12 01:19:12 BoogieIcfgContainer [2021-12-21 13:19:12,811 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-12-21 13:19:12,812 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-12-21 13:19:12,812 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-12-21 13:19:12,812 INFO L275 PluginConnector]: Witness Printer initialized [2021-12-21 13:19:12,812 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 01:19:05" (3/4) ... [2021-12-21 13:19:12,813 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-12-21 13:19:12,856 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2021-12-21 13:19:12,856 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-12-21 13:19:12,856 INFO L158 Benchmark]: Toolchain (without parser) took 7594.89ms. Allocated memory was 104.9MB in the beginning and 151.0MB in the end (delta: 46.1MB). Free memory was 76.9MB in the beginning and 61.8MB in the end (delta: 15.1MB). Peak memory consumption was 61.5MB. Max. memory is 16.1GB. [2021-12-21 13:19:12,856 INFO L158 Benchmark]: CDTParser took 0.16ms. Allocated memory is still 104.9MB. Free memory is still 62.0MB. There was no memory consumed. Max. memory is 16.1GB. [2021-12-21 13:19:12,857 INFO L158 Benchmark]: CACSL2BoogieTranslator took 168.92ms. Allocated memory is still 104.9MB. Free memory was 76.9MB in the beginning and 80.6MB in the end (delta: -3.7MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-12-21 13:19:12,857 INFO L158 Benchmark]: Boogie Procedure Inliner took 26.21ms. Allocated memory is still 104.9MB. Free memory was 80.6MB in the beginning and 79.2MB in the end (delta: 1.4MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-12-21 13:19:12,857 INFO L158 Benchmark]: Boogie Preprocessor took 22.62ms. Allocated memory is still 104.9MB. Free memory was 79.2MB in the beginning and 78.1MB in the end (delta: 1.1MB). There was no memory consumed. Max. memory is 16.1GB. [2021-12-21 13:19:12,857 INFO L158 Benchmark]: RCFGBuilder took 191.25ms. Allocated memory is still 104.9MB. Free memory was 78.1MB in the beginning and 69.0MB in the end (delta: 9.1MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-12-21 13:19:12,858 INFO L158 Benchmark]: TraceAbstraction took 7133.91ms. Allocated memory was 104.9MB in the beginning and 151.0MB in the end (delta: 46.1MB). Free memory was 68.7MB in the beginning and 63.9MB in the end (delta: 4.8MB). Peak memory consumption was 52.5MB. Max. memory is 16.1GB. [2021-12-21 13:19:12,858 INFO L158 Benchmark]: Witness Printer took 44.25ms. Allocated memory is still 151.0MB. Free memory was 63.9MB in the beginning and 61.8MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-12-21 13:19:12,860 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16ms. Allocated memory is still 104.9MB. Free memory is still 62.0MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 168.92ms. Allocated memory is still 104.9MB. Free memory was 76.9MB in the beginning and 80.6MB in the end (delta: -3.7MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 26.21ms. Allocated memory is still 104.9MB. Free memory was 80.6MB in the beginning and 79.2MB in the end (delta: 1.4MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 22.62ms. Allocated memory is still 104.9MB. Free memory was 79.2MB in the beginning and 78.1MB in the end (delta: 1.1MB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 191.25ms. Allocated memory is still 104.9MB. Free memory was 78.1MB in the beginning and 69.0MB in the end (delta: 9.1MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * TraceAbstraction took 7133.91ms. Allocated memory was 104.9MB in the beginning and 151.0MB in the end (delta: 46.1MB). Free memory was 68.7MB in the beginning and 63.9MB in the end (delta: 4.8MB). Peak memory consumption was 52.5MB. Max. memory is 16.1GB. * Witness Printer took 44.25ms. Allocated memory is still 151.0MB. Free memory was 63.9MB in the beginning and 61.8MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 41]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L38] int x = 4; VAL [x=4] [L39] CALL, EXPR fibo1(x) VAL [\old(n)=4] [L10] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L12] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L20] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L22] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L10] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L12] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L20] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L22] COND TRUE n == 1 [L23] return 1; VAL [\old(n)=1, \result=1, n=1] [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L20] COND TRUE n < 1 [L21] return 0; VAL [\old(n)=0, \result=0, n=0] [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L15] return fibo2(n-1) + fibo2(n-2); [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L10] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L12] COND TRUE n == 1 [L13] return 1; VAL [\old(n)=1, \result=1, n=1] [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L20] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L22] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L10] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L12] COND TRUE n == 1 [L13] return 1; VAL [\old(n)=1, \result=1, n=1] [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L10] COND TRUE n < 1 [L11] return 0; VAL [\old(n)=0, \result=0, n=0] [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L15] return fibo2(n-1) + fibo2(n-2); [L39] RET, EXPR fibo1(x) VAL [fibo1(x)=3, x=4] [L39] int result = fibo1(x); [L40] COND TRUE result == 3 VAL [result=3, x=4] [L41] reach_error() VAL [result=3, x=4] - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 29 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 7.1s, OverallIterations: 10, TraceHistogramMax: 5, PathProgramHistogramMax: 2, EmptinessCheckTime: 0.0s, AutomataDifference: 1.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 448 SdHoareTripleChecker+Valid, 0.9s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 385 mSDsluCounter, 1426 SdHoareTripleChecker+Invalid, 0.7s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 1180 mSDsCounter, 353 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 1739 IncrementalHoareTripleChecker+Invalid, 2092 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 353 mSolverCounterUnsat, 246 mSDtfsCounter, 1739 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 781 GetRequests, 618 SyntacticMatches, 17 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 538 ImplicationChecksByTransitivity, 1.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=139occurred in iteration=7, InterpolantAutomatonStates: 111, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 9 MinimizatonAttempts, 70 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 3.2s InterpolantComputationTime, 664 NumberOfCodeBlocks, 664 NumberOfCodeBlocksAsserted, 18 NumberOfCheckSat, 865 ConstructedInterpolants, 0 QuantifiedInterpolants, 1897 SizeOfPredicates, 18 NumberOfNonLiveVariables, 808 ConjunctsInSsa, 50 ConjunctsInUnsatCore, 23 InterpolantComputations, 2 PerfectInterpolantSequences, 494/648 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! [2021-12-21 13:19:12,892 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... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE