./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/loops-crafted-1/nested3-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e8d55036 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/loops-crafted-1/nested3-2.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 0397e1839c0d761fe403b06501425acc9e7bddc9f103e53ae177509d148aabf4 --- Real Ultimate output --- This is Ultimate 0.2.2-?-e8d5503-m [2023-02-15 20:15:44,508 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-02-15 20:15:44,510 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-02-15 20:15:44,541 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-02-15 20:15:44,541 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-02-15 20:15:44,544 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-02-15 20:15:44,546 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-02-15 20:15:44,548 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-02-15 20:15:44,550 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-02-15 20:15:44,557 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-02-15 20:15:44,559 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-02-15 20:15:44,561 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-02-15 20:15:44,561 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-02-15 20:15:44,565 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-02-15 20:15:44,568 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-02-15 20:15:44,569 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-02-15 20:15:44,570 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-02-15 20:15:44,571 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-02-15 20:15:44,572 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-02-15 20:15:44,577 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-02-15 20:15:44,578 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-02-15 20:15:44,579 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-02-15 20:15:44,580 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-02-15 20:15:44,580 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-02-15 20:15:44,587 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-02-15 20:15:44,588 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-02-15 20:15:44,588 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-02-15 20:15:44,589 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-02-15 20:15:44,589 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-02-15 20:15:44,590 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-02-15 20:15:44,591 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-02-15 20:15:44,591 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-02-15 20:15:44,593 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-02-15 20:15:44,593 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-02-15 20:15:44,594 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-02-15 20:15:44,594 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-02-15 20:15:44,594 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-02-15 20:15:44,595 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-02-15 20:15:44,595 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-02-15 20:15:44,596 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-02-15 20:15:44,597 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-02-15 20:15:44,598 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2023-02-15 20:15:44,634 INFO L113 SettingsManager]: Loading preferences was successful [2023-02-15 20:15:44,634 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-02-15 20:15:44,635 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-02-15 20:15:44,635 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-02-15 20:15:44,636 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-02-15 20:15:44,636 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-02-15 20:15:44,636 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-02-15 20:15:44,637 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2023-02-15 20:15:44,637 INFO L138 SettingsManager]: * Use SBE=true [2023-02-15 20:15:44,637 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-02-15 20:15:44,638 INFO L138 SettingsManager]: * sizeof long=4 [2023-02-15 20:15:44,638 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-02-15 20:15:44,638 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-02-15 20:15:44,638 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-02-15 20:15:44,638 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-02-15 20:15:44,639 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-02-15 20:15:44,639 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-02-15 20:15:44,639 INFO L138 SettingsManager]: * sizeof long double=12 [2023-02-15 20:15:44,639 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-02-15 20:15:44,639 INFO L138 SettingsManager]: * Use constant arrays=true [2023-02-15 20:15:44,639 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-02-15 20:15:44,640 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-02-15 20:15:44,640 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-02-15 20:15:44,640 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-02-15 20:15:44,640 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-02-15 20:15:44,640 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-02-15 20:15:44,641 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-02-15 20:15:44,641 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-02-15 20:15:44,641 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2023-02-15 20:15:44,641 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-02-15 20:15:44,641 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-02-15 20:15:44,641 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-02-15 20:15:44,642 INFO L138 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-02-15 20:15:44,642 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-02-15 20:15:44,642 INFO L138 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC [2023-02-15 20:15:44,642 INFO L138 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0397e1839c0d761fe403b06501425acc9e7bddc9f103e53ae177509d148aabf4 [2023-02-15 20:15:44,888 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-02-15 20:15:44,905 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-02-15 20:15:44,907 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-02-15 20:15:44,908 INFO L271 PluginConnector]: Initializing CDTParser... [2023-02-15 20:15:44,908 INFO L275 PluginConnector]: CDTParser initialized [2023-02-15 20:15:44,909 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops-crafted-1/nested3-2.c [2023-02-15 20:15:46,096 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-02-15 20:15:46,290 INFO L351 CDTParser]: Found 1 translation units. [2023-02-15 20:15:46,291 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/nested3-2.c [2023-02-15 20:15:46,296 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/843c6add9/9366bede52354ad0a4ea9543d5ff7d9a/FLAGd9484ed52 [2023-02-15 20:15:46,306 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/843c6add9/9366bede52354ad0a4ea9543d5ff7d9a [2023-02-15 20:15:46,308 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-02-15 20:15:46,309 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2023-02-15 20:15:46,310 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-02-15 20:15:46,311 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-02-15 20:15:46,314 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-02-15 20:15:46,314 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.02 08:15:46" (1/1) ... [2023-02-15 20:15:46,315 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@42668a0a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 08:15:46, skipping insertion in model container [2023-02-15 20:15:46,315 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.02 08:15:46" (1/1) ... [2023-02-15 20:15:46,321 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-02-15 20:15:46,332 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-02-15 20:15:46,444 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/nested3-2.c[321,334] [2023-02-15 20:15:46,468 INFO L210 PostProcessor]: Analyzing one entry point: main [2023-02-15 20:15:46,479 INFO L203 MainTranslator]: Completed pre-run [2023-02-15 20:15:46,490 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/nested3-2.c[321,334] [2023-02-15 20:15:46,503 INFO L210 PostProcessor]: Analyzing one entry point: main [2023-02-15 20:15:46,515 INFO L208 MainTranslator]: Completed translation [2023-02-15 20:15:46,515 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 08:15:46 WrapperNode [2023-02-15 20:15:46,515 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-02-15 20:15:46,517 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-02-15 20:15:46,517 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-02-15 20:15:46,517 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2023-02-15 20:15:46,523 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 08:15:46" (1/1) ... [2023-02-15 20:15:46,532 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 08:15:46" (1/1) ... [2023-02-15 20:15:46,551 INFO L138 Inliner]: procedures = 12, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 42 [2023-02-15 20:15:46,552 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-02-15 20:15:46,553 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-02-15 20:15:46,553 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-02-15 20:15:46,553 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-02-15 20:15:46,561 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 08:15:46" (1/1) ... [2023-02-15 20:15:46,561 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 08:15:46" (1/1) ... [2023-02-15 20:15:46,571 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 08:15:46" (1/1) ... [2023-02-15 20:15:46,572 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 08:15:46" (1/1) ... [2023-02-15 20:15:46,578 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 08:15:46" (1/1) ... [2023-02-15 20:15:46,583 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 08:15:46" (1/1) ... [2023-02-15 20:15:46,587 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 08:15:46" (1/1) ... [2023-02-15 20:15:46,588 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 08:15:46" (1/1) ... [2023-02-15 20:15:46,590 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-02-15 20:15:46,591 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-02-15 20:15:46,592 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-02-15 20:15:46,592 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-02-15 20:15:46,593 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 08:15:46" (1/1) ... [2023-02-15 20:15:46,597 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-02-15 20:15:46,606 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-02-15 20:15:46,625 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) [2023-02-15 20:15:46,645 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 [2023-02-15 20:15:46,664 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-02-15 20:15:46,664 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-02-15 20:15:46,665 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-02-15 20:15:46,665 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-02-15 20:15:46,665 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-02-15 20:15:46,665 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-02-15 20:15:46,720 INFO L235 CfgBuilder]: Building ICFG [2023-02-15 20:15:46,722 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2023-02-15 20:15:46,841 INFO L276 CfgBuilder]: Performing block encoding [2023-02-15 20:15:46,845 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-02-15 20:15:46,846 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2023-02-15 20:15:46,847 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.02 08:15:46 BoogieIcfgContainer [2023-02-15 20:15:46,847 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-02-15 20:15:46,849 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-02-15 20:15:46,849 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-02-15 20:15:46,852 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-02-15 20:15:46,852 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.02 08:15:46" (1/3) ... [2023-02-15 20:15:46,853 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e8ef685 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.02 08:15:46, skipping insertion in model container [2023-02-15 20:15:46,853 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 08:15:46" (2/3) ... [2023-02-15 20:15:46,853 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e8ef685 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.02 08:15:46, skipping insertion in model container [2023-02-15 20:15:46,853 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.02 08:15:46" (3/3) ... [2023-02-15 20:15:46,855 INFO L112 eAbstractionObserver]: Analyzing ICFG nested3-2.c [2023-02-15 20:15:46,870 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-02-15 20:15:46,870 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-02-15 20:15:46,909 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-02-15 20:15:46,915 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@287a195b, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-02-15 20:15:46,915 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-02-15 20:15:46,918 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 15 states have internal predecessors, (22), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-02-15 20:15:46,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-02-15 20:15:46,924 INFO L187 NwaCegarLoop]: Found error trace [2023-02-15 20:15:46,924 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-02-15 20:15:46,925 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-15 20:15:46,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-15 20:15:46,931 INFO L85 PathProgramCache]: Analyzing trace with hash 1810304921, now seen corresponding path program 1 times [2023-02-15 20:15:46,939 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-15 20:15:46,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657951047] [2023-02-15 20:15:46,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-15 20:15:46,940 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-15 20:15:47,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-15 20:15:47,190 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-15 20:15:47,191 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-15 20:15:47,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657951047] [2023-02-15 20:15:47,191 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [657951047] provided 1 perfect and 0 imperfect interpolant sequences [2023-02-15 20:15:47,192 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-02-15 20:15:47,192 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-02-15 20:15:47,193 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995648967] [2023-02-15 20:15:47,194 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-02-15 20:15:47,197 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-02-15 20:15:47,197 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-15 20:15:47,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-02-15 20:15:47,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-02-15 20:15:47,234 INFO L87 Difference]: Start difference. First operand has 20 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 15 states have internal predecessors, (22), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-15 20:15:47,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-15 20:15:47,299 INFO L93 Difference]: Finished difference Result 45 states and 74 transitions. [2023-02-15 20:15:47,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-02-15 20:15:47,301 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-02-15 20:15:47,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-15 20:15:47,307 INFO L225 Difference]: With dead ends: 45 [2023-02-15 20:15:47,307 INFO L226 Difference]: Without dead ends: 23 [2023-02-15 20:15:47,309 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-02-15 20:15:47,312 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 6 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-02-15 20:15:47,326 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 44 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-02-15 20:15:47,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-02-15 20:15:47,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 17. [2023-02-15 20:15:47,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-02-15 20:15:47,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2023-02-15 20:15:47,359 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 7 [2023-02-15 20:15:47,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-15 20:15:47,360 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2023-02-15 20:15:47,361 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-15 20:15:47,361 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2023-02-15 20:15:47,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-02-15 20:15:47,362 INFO L187 NwaCegarLoop]: Found error trace [2023-02-15 20:15:47,362 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-02-15 20:15:47,362 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-02-15 20:15:47,364 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-15 20:15:47,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-15 20:15:47,365 INFO L85 PathProgramCache]: Analyzing trace with hash 300961951, now seen corresponding path program 1 times [2023-02-15 20:15:47,365 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-15 20:15:47,365 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117091077] [2023-02-15 20:15:47,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-15 20:15:47,366 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-15 20:15:47,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-15 20:15:47,507 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-15 20:15:47,508 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-15 20:15:47,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2117091077] [2023-02-15 20:15:47,508 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2117091077] provided 1 perfect and 0 imperfect interpolant sequences [2023-02-15 20:15:47,509 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-02-15 20:15:47,509 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-02-15 20:15:47,509 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260053556] [2023-02-15 20:15:47,509 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-02-15 20:15:47,510 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-02-15 20:15:47,510 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-15 20:15:47,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-02-15 20:15:47,513 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-02-15 20:15:47,513 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-15 20:15:47,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-15 20:15:47,543 INFO L93 Difference]: Finished difference Result 35 states and 46 transitions. [2023-02-15 20:15:47,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-02-15 20:15:47,544 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-02-15 20:15:47,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-15 20:15:47,545 INFO L225 Difference]: With dead ends: 35 [2023-02-15 20:15:47,545 INFO L226 Difference]: Without dead ends: 21 [2023-02-15 20:15:47,546 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-02-15 20:15:47,547 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 3 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-02-15 20:15:47,550 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 33 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-02-15 20:15:47,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-02-15 20:15:47,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2023-02-15 20:15:47,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 14 states have internal predecessors, (17), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-02-15 20:15:47,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2023-02-15 20:15:47,560 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 8 [2023-02-15 20:15:47,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-15 20:15:47,560 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2023-02-15 20:15:47,561 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-15 20:15:47,562 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2023-02-15 20:15:47,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-02-15 20:15:47,564 INFO L187 NwaCegarLoop]: Found error trace [2023-02-15 20:15:47,564 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-15 20:15:47,564 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-02-15 20:15:47,564 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-15 20:15:47,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-15 20:15:47,567 INFO L85 PathProgramCache]: Analyzing trace with hash 766069286, now seen corresponding path program 1 times [2023-02-15 20:15:47,567 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-15 20:15:47,567 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1063572847] [2023-02-15 20:15:47,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-15 20:15:47,568 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-15 20:15:47,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-15 20:15:47,680 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-15 20:15:47,681 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-15 20:15:47,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1063572847] [2023-02-15 20:15:47,682 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1063572847] provided 1 perfect and 0 imperfect interpolant sequences [2023-02-15 20:15:47,682 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-02-15 20:15:47,683 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-02-15 20:15:47,683 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314660200] [2023-02-15 20:15:47,683 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-02-15 20:15:47,683 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-02-15 20:15:47,684 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-15 20:15:47,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-02-15 20:15:47,686 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-02-15 20:15:47,686 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-15 20:15:47,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-15 20:15:47,707 INFO L93 Difference]: Finished difference Result 35 states and 44 transitions. [2023-02-15 20:15:47,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-02-15 20:15:47,708 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-02-15 20:15:47,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-15 20:15:47,709 INFO L225 Difference]: With dead ends: 35 [2023-02-15 20:15:47,710 INFO L226 Difference]: Without dead ends: 20 [2023-02-15 20:15:47,710 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-02-15 20:15:47,712 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 1 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-02-15 20:15:47,714 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 34 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-02-15 20:15:47,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-02-15 20:15:47,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2023-02-15 20:15:47,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 15 states have internal predecessors, (18), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-02-15 20:15:47,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2023-02-15 20:15:47,731 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 9 [2023-02-15 20:15:47,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-15 20:15:47,731 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2023-02-15 20:15:47,731 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-15 20:15:47,731 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2023-02-15 20:15:47,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-02-15 20:15:47,732 INFO L187 NwaCegarLoop]: Found error trace [2023-02-15 20:15:47,732 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-15 20:15:47,733 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-02-15 20:15:47,733 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-15 20:15:47,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-15 20:15:47,735 INFO L85 PathProgramCache]: Analyzing trace with hash -1993625471, now seen corresponding path program 1 times [2023-02-15 20:15:47,736 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-15 20:15:47,736 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1972168456] [2023-02-15 20:15:47,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-15 20:15:47,737 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-15 20:15:47,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-15 20:15:47,855 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-15 20:15:47,857 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-15 20:15:47,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1972168456] [2023-02-15 20:15:47,857 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1972168456] provided 0 perfect and 1 imperfect interpolant sequences [2023-02-15 20:15:47,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1938314251] [2023-02-15 20:15:47,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-15 20:15:47,858 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-15 20:15:47,858 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-02-15 20:15:47,861 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) [2023-02-15 20:15:47,863 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-02-15 20:15:47,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-15 20:15:47,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 5 conjunts are in the unsatisfiable core [2023-02-15 20:15:47,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-02-15 20:15:47,951 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-15 20:15:47,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-02-15 20:15:47,998 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-15 20:15:47,998 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1938314251] provided 0 perfect and 2 imperfect interpolant sequences [2023-02-15 20:15:47,998 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-02-15 20:15:47,999 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-02-15 20:15:47,999 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675878675] [2023-02-15 20:15:47,999 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-02-15 20:15:47,999 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-02-15 20:15:48,000 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-15 20:15:48,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-02-15 20:15:48,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2023-02-15 20:15:48,007 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 7 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-15 20:15:48,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-15 20:15:48,044 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2023-02-15 20:15:48,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-02-15 20:15:48,044 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 7 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-02-15 20:15:48,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-15 20:15:48,045 INFO L225 Difference]: With dead ends: 39 [2023-02-15 20:15:48,045 INFO L226 Difference]: Without dead ends: 23 [2023-02-15 20:15:48,046 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=30, Unknown=0, NotChecked=0, Total=56 [2023-02-15 20:15:48,047 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 3 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-02-15 20:15:48,047 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 50 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-02-15 20:15:48,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-02-15 20:15:48,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2023-02-15 20:15:48,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-02-15 20:15:48,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2023-02-15 20:15:48,052 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 10 [2023-02-15 20:15:48,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-15 20:15:48,053 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2023-02-15 20:15:48,053 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 7 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-15 20:15:48,053 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2023-02-15 20:15:48,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-02-15 20:15:48,053 INFO L187 NwaCegarLoop]: Found error trace [2023-02-15 20:15:48,054 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-15 20:15:48,062 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-02-15 20:15:48,254 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-15 20:15:48,255 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-15 20:15:48,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-15 20:15:48,255 INFO L85 PathProgramCache]: Analyzing trace with hash 775784678, now seen corresponding path program 2 times [2023-02-15 20:15:48,255 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-15 20:15:48,256 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [678490628] [2023-02-15 20:15:48,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-15 20:15:48,256 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-15 20:15:48,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-15 20:15:48,398 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-15 20:15:48,399 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-15 20:15:48,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [678490628] [2023-02-15 20:15:48,399 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [678490628] provided 0 perfect and 1 imperfect interpolant sequences [2023-02-15 20:15:48,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [563537322] [2023-02-15 20:15:48,399 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-02-15 20:15:48,400 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-15 20:15:48,400 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-02-15 20:15:48,401 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) [2023-02-15 20:15:48,404 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-02-15 20:15:48,449 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-02-15 20:15:48,449 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-02-15 20:15:48,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 16 conjunts are in the unsatisfiable core [2023-02-15 20:15:48,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-02-15 20:15:48,560 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-15 20:15:48,560 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-02-15 20:15:48,722 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-02-15 20:15:48,723 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [563537322] provided 0 perfect and 2 imperfect interpolant sequences [2023-02-15 20:15:48,724 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-02-15 20:15:48,724 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 8] total 16 [2023-02-15 20:15:48,729 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795523636] [2023-02-15 20:15:48,729 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-02-15 20:15:48,735 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-02-15 20:15:48,735 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-15 20:15:48,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-02-15 20:15:48,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2023-02-15 20:15:48,739 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 16 states, 16 states have (on average 1.5) internal successors, (24), 14 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-15 20:15:49,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-15 20:15:49,005 INFO L93 Difference]: Finished difference Result 74 states and 98 transitions. [2023-02-15 20:15:49,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-02-15 20:15:49,007 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 14 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-02-15 20:15:49,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-15 20:15:49,009 INFO L225 Difference]: With dead ends: 74 [2023-02-15 20:15:49,009 INFO L226 Difference]: Without dead ends: 55 [2023-02-15 20:15:49,010 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2023-02-15 20:15:49,010 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 32 mSDsluCounter, 309 mSDsCounter, 0 mSdLazyCounter, 230 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 360 SdHoareTripleChecker+Invalid, 235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-02-15 20:15:49,011 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 360 Invalid, 235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 230 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-02-15 20:15:49,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2023-02-15 20:15:49,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 31. [2023-02-15 20:15:49,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 26 states have internal predecessors, (31), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-02-15 20:15:49,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2023-02-15 20:15:49,027 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 13 [2023-02-15 20:15:49,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-15 20:15:49,028 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2023-02-15 20:15:49,028 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 14 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-15 20:15:49,028 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2023-02-15 20:15:49,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-02-15 20:15:49,029 INFO L187 NwaCegarLoop]: Found error trace [2023-02-15 20:15:49,030 INFO L195 NwaCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-15 20:15:49,039 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-02-15 20:15:49,235 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-15 20:15:49,235 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-15 20:15:49,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-15 20:15:49,236 INFO L85 PathProgramCache]: Analyzing trace with hash -1692448319, now seen corresponding path program 3 times [2023-02-15 20:15:49,236 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-15 20:15:49,236 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1442117241] [2023-02-15 20:15:49,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-15 20:15:49,236 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-15 20:15:49,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-15 20:15:49,362 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-15 20:15:49,363 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-15 20:15:49,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1442117241] [2023-02-15 20:15:49,364 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1442117241] provided 0 perfect and 1 imperfect interpolant sequences [2023-02-15 20:15:49,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1597184448] [2023-02-15 20:15:49,365 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-02-15 20:15:49,365 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-15 20:15:49,365 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-02-15 20:15:49,369 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) [2023-02-15 20:15:49,391 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-02-15 20:15:49,418 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-02-15 20:15:49,418 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-02-15 20:15:49,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 13 conjunts are in the unsatisfiable core [2023-02-15 20:15:49,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-02-15 20:15:49,471 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-15 20:15:49,471 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-02-15 20:15:49,567 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-15 20:15:49,568 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1597184448] provided 0 perfect and 2 imperfect interpolant sequences [2023-02-15 20:15:49,568 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-02-15 20:15:49,568 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2023-02-15 20:15:49,568 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994222128] [2023-02-15 20:15:49,569 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-02-15 20:15:49,569 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-02-15 20:15:49,569 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-15 20:15:49,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-02-15 20:15:49,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=135, Unknown=0, NotChecked=0, Total=210 [2023-02-15 20:15:49,570 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand has 15 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 15 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-15 20:15:50,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-15 20:15:50,088 INFO L93 Difference]: Finished difference Result 67 states and 88 transitions. [2023-02-15 20:15:50,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-02-15 20:15:50,089 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 15 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-02-15 20:15:50,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-15 20:15:50,091 INFO L225 Difference]: With dead ends: 67 [2023-02-15 20:15:50,091 INFO L226 Difference]: Without dead ends: 39 [2023-02-15 20:15:50,092 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=150, Invalid=230, Unknown=0, NotChecked=0, Total=380 [2023-02-15 20:15:50,093 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 8 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-02-15 20:15:50,093 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 114 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-02-15 20:15:50,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2023-02-15 20:15:50,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2023-02-15 20:15:50,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 31 states have (on average 1.2258064516129032) internal successors, (38), 33 states have internal predecessors, (38), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-02-15 20:15:50,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 45 transitions. [2023-02-15 20:15:50,103 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 45 transitions. Word has length 14 [2023-02-15 20:15:50,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-15 20:15:50,104 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 45 transitions. [2023-02-15 20:15:50,104 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 15 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-15 20:15:50,104 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 45 transitions. [2023-02-15 20:15:50,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-02-15 20:15:50,105 INFO L187 NwaCegarLoop]: Found error trace [2023-02-15 20:15:50,105 INFO L195 NwaCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-15 20:15:50,115 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-02-15 20:15:50,310 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-15 20:15:50,311 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-15 20:15:50,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-15 20:15:50,311 INFO L85 PathProgramCache]: Analyzing trace with hash 1368038465, now seen corresponding path program 4 times [2023-02-15 20:15:50,311 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-15 20:15:50,311 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2122793609] [2023-02-15 20:15:50,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-15 20:15:50,312 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-15 20:15:50,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-15 20:15:50,649 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-15 20:15:50,649 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-15 20:15:50,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2122793609] [2023-02-15 20:15:50,649 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2122793609] provided 0 perfect and 1 imperfect interpolant sequences [2023-02-15 20:15:50,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [276264541] [2023-02-15 20:15:50,649 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-02-15 20:15:50,649 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-15 20:15:50,650 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-02-15 20:15:50,653 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) [2023-02-15 20:15:50,657 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-02-15 20:15:50,712 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-02-15 20:15:50,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-02-15 20:15:50,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 29 conjunts are in the unsatisfiable core [2023-02-15 20:15:50,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-02-15 20:15:50,830 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-15 20:15:50,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-02-15 20:15:51,261 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-15 20:15:51,262 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [276264541] provided 0 perfect and 2 imperfect interpolant sequences [2023-02-15 20:15:51,262 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-02-15 20:15:51,262 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2023-02-15 20:15:51,262 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566623161] [2023-02-15 20:15:51,262 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-02-15 20:15:51,263 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2023-02-15 20:15:51,263 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-15 20:15:51,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2023-02-15 20:15:51,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=283, Invalid=647, Unknown=0, NotChecked=0, Total=930 [2023-02-15 20:15:51,264 INFO L87 Difference]: Start difference. First operand 38 states and 45 transitions. Second operand has 31 states, 31 states have (on average 1.2258064516129032) internal successors, (38), 31 states have internal predecessors, (38), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-15 20:16:01,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-15 20:16:01,300 INFO L93 Difference]: Finished difference Result 90 states and 120 transitions. [2023-02-15 20:16:01,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2023-02-15 20:16:01,309 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.2258064516129032) internal successors, (38), 31 states have internal predecessors, (38), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2023-02-15 20:16:01,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-15 20:16:01,312 INFO L225 Difference]: With dead ends: 90 [2023-02-15 20:16:01,315 INFO L226 Difference]: Without dead ends: 55 [2023-02-15 20:16:01,316 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=686, Invalid=1206, Unknown=0, NotChecked=0, Total=1892 [2023-02-15 20:16:01,316 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 11 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 262 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 262 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-02-15 20:16:01,317 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 242 Invalid, 274 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 262 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-02-15 20:16:01,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2023-02-15 20:16:01,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2023-02-15 20:16:01,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 47 states have (on average 1.148936170212766) internal successors, (54), 49 states have internal predecessors, (54), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-02-15 20:16:01,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 61 transitions. [2023-02-15 20:16:01,333 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 61 transitions. Word has length 22 [2023-02-15 20:16:01,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-15 20:16:01,333 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 61 transitions. [2023-02-15 20:16:01,334 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.2258064516129032) internal successors, (38), 31 states have internal predecessors, (38), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-15 20:16:01,334 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 61 transitions. [2023-02-15 20:16:01,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-02-15 20:16:01,335 INFO L187 NwaCegarLoop]: Found error trace [2023-02-15 20:16:01,335 INFO L195 NwaCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-15 20:16:01,344 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-02-15 20:16:01,537 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-15 20:16:01,537 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-15 20:16:01,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-15 20:16:01,537 INFO L85 PathProgramCache]: Analyzing trace with hash -1187921599, now seen corresponding path program 5 times [2023-02-15 20:16:01,537 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-15 20:16:01,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1572344050] [2023-02-15 20:16:01,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-15 20:16:01,538 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-15 20:16:01,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-15 20:16:02,393 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-15 20:16:02,393 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-15 20:16:02,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1572344050] [2023-02-15 20:16:02,393 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1572344050] provided 0 perfect and 1 imperfect interpolant sequences [2023-02-15 20:16:02,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1576023147] [2023-02-15 20:16:02,394 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2023-02-15 20:16:02,394 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-15 20:16:02,394 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-02-15 20:16:02,395 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) [2023-02-15 20:16:02,427 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-02-15 20:16:09,014 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 16 check-sat command(s) [2023-02-15 20:16:09,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-02-15 20:16:09,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 61 conjunts are in the unsatisfiable core [2023-02-15 20:16:09,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-02-15 20:16:09,188 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-15 20:16:09,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-02-15 20:16:10,772 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-15 20:16:10,772 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1576023147] provided 0 perfect and 2 imperfect interpolant sequences [2023-02-15 20:16:10,772 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-02-15 20:16:10,772 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2023-02-15 20:16:10,772 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757105654] [2023-02-15 20:16:10,772 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-02-15 20:16:10,773 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2023-02-15 20:16:10,773 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-15 20:16:10,774 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2023-02-15 20:16:10,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1083, Invalid=2823, Unknown=0, NotChecked=0, Total=3906 [2023-02-15 20:16:10,776 INFO L87 Difference]: Start difference. First operand 54 states and 61 transitions. Second operand has 63 states, 63 states have (on average 1.1111111111111112) internal successors, (70), 63 states have internal predecessors, (70), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-15 20:16:26,334 WARN L233 SmtUtils]: Spent 5.44s on a formula simplification. DAG size of input: 122 DAG size of output: 10 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)