./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/heap-manipulation/dancing.i --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/heap-manipulation/dancing.i -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 c2e0266b63b958a771d0226973905d5a39a7a28d05d194ae66381394d9ab520a --- Real Ultimate output --- This is Ultimate 0.2.2-dev-ff03de6 [2021-12-21 12:04:11,352 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-21 12:04:11,354 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-21 12:04:11,394 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-21 12:04:11,394 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-21 12:04:11,397 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-21 12:04:11,399 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-21 12:04:11,401 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-21 12:04:11,402 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-21 12:04:11,406 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-21 12:04:11,407 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-21 12:04:11,408 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-21 12:04:11,408 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-21 12:04:11,410 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-21 12:04:11,411 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-21 12:04:11,413 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-21 12:04:11,414 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-21 12:04:11,415 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-21 12:04:11,416 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-21 12:04:11,421 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-21 12:04:11,422 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-21 12:04:11,423 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-21 12:04:11,424 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-21 12:04:11,424 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-21 12:04:11,429 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-21 12:04:11,429 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-21 12:04:11,430 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-21 12:04:11,431 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-21 12:04:11,431 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-21 12:04:11,432 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-21 12:04:11,432 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-21 12:04:11,433 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-21 12:04:11,434 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-21 12:04:11,435 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-21 12:04:11,435 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-21 12:04:11,436 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-21 12:04:11,436 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-21 12:04:11,436 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-21 12:04:11,437 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-21 12:04:11,438 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-21 12:04:11,438 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-21 12:04:11,439 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-21 12:04:11,456 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-21 12:04:11,456 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-21 12:04:11,456 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-21 12:04:11,456 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-21 12:04:11,457 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-21 12:04:11,457 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-21 12:04:11,457 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-21 12:04:11,457 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-21 12:04:11,457 INFO L138 SettingsManager]: * Use SBE=true [2021-12-21 12:04:11,457 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-21 12:04:11,457 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-21 12:04:11,457 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-21 12:04:11,458 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-21 12:04:11,458 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-21 12:04:11,458 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-21 12:04:11,458 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-21 12:04:11,458 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-21 12:04:11,458 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-21 12:04:11,458 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-21 12:04:11,458 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-21 12:04:11,458 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-21 12:04:11,458 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-21 12:04:11,458 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-21 12:04:11,459 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-21 12:04:11,459 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 12:04:11,459 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-21 12:04:11,475 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-21 12:04:11,475 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-21 12:04:11,475 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-21 12:04:11,475 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-21 12:04:11,476 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-21 12:04:11,476 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-21 12:04:11,476 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-21 12:04:11,476 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-21 12:04:11,476 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c2e0266b63b958a771d0226973905d5a39a7a28d05d194ae66381394d9ab520a [2021-12-21 12:04:11,642 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-21 12:04:11,661 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-21 12:04:11,663 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-21 12:04:11,664 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-21 12:04:11,664 INFO L275 PluginConnector]: CDTParser initialized [2021-12-21 12:04:11,665 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/heap-manipulation/dancing.i [2021-12-21 12:04:11,717 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e96af203f/c5b19e29d3d54adc8d5f90f55a087395/FLAGf098a2860 [2021-12-21 12:04:12,060 INFO L306 CDTParser]: Found 1 translation units. [2021-12-21 12:04:12,061 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/heap-manipulation/dancing.i [2021-12-21 12:04:12,069 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e96af203f/c5b19e29d3d54adc8d5f90f55a087395/FLAGf098a2860 [2021-12-21 12:04:12,484 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e96af203f/c5b19e29d3d54adc8d5f90f55a087395 [2021-12-21 12:04:12,487 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-21 12:04:12,488 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-21 12:04:12,489 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-21 12:04:12,489 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-21 12:04:12,491 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-21 12:04:12,492 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 12:04:12" (1/1) ... [2021-12-21 12:04:12,493 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@145625aa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:04:12, skipping insertion in model container [2021-12-21 12:04:12,493 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 12:04:12" (1/1) ... [2021-12-21 12:04:12,498 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-21 12:04:12,529 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-21 12:04:12,636 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/heap-manipulation/dancing.i[938,951] [2021-12-21 12:04:12,738 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 12:04:12,747 INFO L203 MainTranslator]: Completed pre-run [2021-12-21 12:04:12,761 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/heap-manipulation/dancing.i[938,951] [2021-12-21 12:04:12,786 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 12:04:12,810 INFO L208 MainTranslator]: Completed translation [2021-12-21 12:04:12,810 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:04:12 WrapperNode [2021-12-21 12:04:12,810 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-21 12:04:12,811 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-21 12:04:12,812 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-21 12:04:12,812 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-21 12:04:12,816 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:04:12" (1/1) ... [2021-12-21 12:04:12,838 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:04:12" (1/1) ... [2021-12-21 12:04:12,859 INFO L137 Inliner]: procedures = 124, calls = 40, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 90 [2021-12-21 12:04:12,860 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-21 12:04:12,861 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-21 12:04:12,861 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-21 12:04:12,861 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-21 12:04:12,865 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:04:12" (1/1) ... [2021-12-21 12:04:12,866 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:04:12" (1/1) ... [2021-12-21 12:04:12,873 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:04:12" (1/1) ... [2021-12-21 12:04:12,874 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:04:12" (1/1) ... [2021-12-21 12:04:12,881 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:04:12" (1/1) ... [2021-12-21 12:04:12,884 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:04:12" (1/1) ... [2021-12-21 12:04:12,885 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:04:12" (1/1) ... [2021-12-21 12:04:12,886 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-21 12:04:12,890 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-21 12:04:12,891 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-21 12:04:12,891 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-21 12:04:12,892 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:04:12" (1/1) ... [2021-12-21 12:04:12,896 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 12:04:12,905 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:04:12,913 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 12:04:12,915 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 12:04:12,945 INFO L130 BoogieDeclarations]: Found specification of procedure is_list_containing_x [2021-12-21 12:04:12,946 INFO L138 BoogieDeclarations]: Found implementation of procedure is_list_containing_x [2021-12-21 12:04:12,946 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-12-21 12:04:12,946 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-12-21 12:04:12,946 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-21 12:04:12,946 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-21 12:04:12,947 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-21 12:04:12,947 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-12-21 12:04:12,947 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-12-21 12:04:12,947 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-21 12:04:12,947 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-21 12:04:12,947 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-21 12:04:12,947 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-21 12:04:13,010 INFO L234 CfgBuilder]: Building ICFG [2021-12-21 12:04:13,011 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-21 12:04:13,201 INFO L275 CfgBuilder]: Performing block encoding [2021-12-21 12:04:13,206 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-21 12:04:13,206 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-12-21 12:04:13,207 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 12:04:13 BoogieIcfgContainer [2021-12-21 12:04:13,207 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-21 12:04:13,209 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-21 12:04:13,209 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-21 12:04:13,225 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-21 12:04:13,225 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 12:04:12" (1/3) ... [2021-12-21 12:04:13,225 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5740e9d0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 12:04:13, skipping insertion in model container [2021-12-21 12:04:13,225 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:04:12" (2/3) ... [2021-12-21 12:04:13,225 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5740e9d0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 12:04:13, skipping insertion in model container [2021-12-21 12:04:13,226 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 12:04:13" (3/3) ... [2021-12-21 12:04:13,226 INFO L111 eAbstractionObserver]: Analyzing ICFG dancing.i [2021-12-21 12:04:13,230 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-21 12:04:13,231 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-21 12:04:13,267 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-21 12:04:13,288 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 12:04:13,289 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-21 12:04:13,314 INFO L276 IsEmpty]: Start isEmpty. Operand has 41 states, 31 states have (on average 1.4516129032258065) internal successors, (45), 32 states have internal predecessors, (45), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-21 12:04:13,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-12-21 12:04:13,319 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:04:13,320 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:04:13,320 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:04:13,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:04:13,329 INFO L85 PathProgramCache]: Analyzing trace with hash 1472755522, now seen corresponding path program 1 times [2021-12-21 12:04:13,335 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:04:13,335 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1287331082] [2021-12-21 12:04:13,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:04:13,336 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:04:13,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:13,504 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 12:04:13,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:13,531 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 12:04:13,532 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:04:13,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1287331082] [2021-12-21 12:04:13,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1287331082] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:04:13,533 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 12:04:13,533 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-21 12:04:13,535 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63640773] [2021-12-21 12:04:13,535 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:04:13,540 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-21 12:04:13,541 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:04:13,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-21 12:04:13,567 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-21 12:04:13,568 INFO L87 Difference]: Start difference. First operand has 41 states, 31 states have (on average 1.4516129032258065) internal successors, (45), 32 states have internal predecessors, (45), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 2 states, 2 states have (on average 8.5) internal successors, (17), 2 states have internal predecessors, (17), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 12:04:13,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:04:13,589 INFO L93 Difference]: Finished difference Result 77 states and 107 transitions. [2021-12-21 12:04:13,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-21 12:04:13,591 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 8.5) internal successors, (17), 2 states have internal predecessors, (17), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-12-21 12:04:13,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:04:13,598 INFO L225 Difference]: With dead ends: 77 [2021-12-21 12:04:13,598 INFO L226 Difference]: Without dead ends: 37 [2021-12-21 12:04:13,601 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-21 12:04:13,604 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:04:13,604 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:04:13,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-12-21 12:04:13,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-12-21 12:04:13,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 28 states have (on average 1.3928571428571428) internal successors, (39), 29 states have internal predecessors, (39), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-21 12:04:13,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 50 transitions. [2021-12-21 12:04:13,634 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 50 transitions. Word has length 20 [2021-12-21 12:04:13,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:04:13,635 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 50 transitions. [2021-12-21 12:04:13,635 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 8.5) internal successors, (17), 2 states have internal predecessors, (17), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 12:04:13,635 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 50 transitions. [2021-12-21 12:04:13,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-12-21 12:04:13,638 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:04:13,638 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:04:13,639 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-21 12:04:13,639 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:04:13,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:04:13,642 INFO L85 PathProgramCache]: Analyzing trace with hash -751028367, now seen corresponding path program 1 times [2021-12-21 12:04:13,642 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:04:13,642 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [623380928] [2021-12-21 12:04:13,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:04:13,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:04:13,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:13,762 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 12:04:13,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:13,773 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 12:04:13,773 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:04:13,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [623380928] [2021-12-21 12:04:13,775 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [623380928] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:04:13,775 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 12:04:13,775 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-21 12:04:13,775 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571594798] [2021-12-21 12:04:13,775 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:04:13,776 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 12:04:13,778 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:04:13,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 12:04:13,778 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-21 12:04:13,779 INFO L87 Difference]: Start difference. First operand 37 states and 50 transitions. Second operand has 5 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 12:04:13,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:04:13,826 INFO L93 Difference]: Finished difference Result 45 states and 58 transitions. [2021-12-21 12:04:13,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 12:04:13,827 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-12-21 12:04:13,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:04:13,829 INFO L225 Difference]: With dead ends: 45 [2021-12-21 12:04:13,829 INFO L226 Difference]: Without dead ends: 43 [2021-12-21 12:04:13,833 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-21 12:04:13,835 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 6 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 183 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:04:13,837 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 183 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:04:13,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-12-21 12:04:13,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2021-12-21 12:04:13,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 31 states have (on average 1.3548387096774193) internal successors, (42), 33 states have internal predecessors, (42), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-21 12:04:13,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 55 transitions. [2021-12-21 12:04:13,847 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 55 transitions. Word has length 20 [2021-12-21 12:04:13,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:04:13,848 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 55 transitions. [2021-12-21 12:04:13,849 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 12:04:13,852 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 55 transitions. [2021-12-21 12:04:13,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-12-21 12:04:13,853 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:04:13,853 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, 1, 1, 1] [2021-12-21 12:04:13,854 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-21 12:04:13,854 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:04:13,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:04:13,854 INFO L85 PathProgramCache]: Analyzing trace with hash 789210768, now seen corresponding path program 1 times [2021-12-21 12:04:13,854 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:04:13,855 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1532855501] [2021-12-21 12:04:13,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:04:13,855 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:04:13,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:13,902 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 12:04:13,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:13,908 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-21 12:04:13,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:13,912 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-21 12:04:13,913 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:04:13,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1532855501] [2021-12-21 12:04:13,913 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1532855501] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:04:13,913 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 12:04:13,913 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-21 12:04:13,914 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861486561] [2021-12-21 12:04:13,914 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:04:13,914 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 12:04:13,914 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:04:13,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 12:04:13,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-21 12:04:13,915 INFO L87 Difference]: Start difference. First operand 42 states and 55 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-21 12:04:13,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:04:13,940 INFO L93 Difference]: Finished difference Result 86 states and 116 transitions. [2021-12-21 12:04:13,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-21 12:04:13,941 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 26 [2021-12-21 12:04:13,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:04:13,942 INFO L225 Difference]: With dead ends: 86 [2021-12-21 12:04:13,942 INFO L226 Difference]: Without dead ends: 63 [2021-12-21 12:04:13,942 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-12-21 12:04:13,945 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 15 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:04:13,945 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 141 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:04:13,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-12-21 12:04:13,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 54. [2021-12-21 12:04:13,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 42 states have (on average 1.380952380952381) internal successors, (58), 44 states have internal predecessors, (58), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-21 12:04:13,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 73 transitions. [2021-12-21 12:04:13,957 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 73 transitions. Word has length 26 [2021-12-21 12:04:13,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:04:13,957 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 73 transitions. [2021-12-21 12:04:13,957 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-21 12:04:13,957 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 73 transitions. [2021-12-21 12:04:13,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-21 12:04:13,958 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:04:13,958 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, 1, 1, 1, 1, 1, 1] [2021-12-21 12:04:13,958 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-12-21 12:04:13,958 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:04:13,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:04:13,959 INFO L85 PathProgramCache]: Analyzing trace with hash 860755832, now seen corresponding path program 1 times [2021-12-21 12:04:13,959 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:04:13,959 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [740268629] [2021-12-21 12:04:13,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:04:13,959 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:04:13,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:14,010 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-12-21 12:04:14,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:14,032 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-12-21 12:04:14,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:14,040 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 12:04:14,041 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:04:14,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [740268629] [2021-12-21 12:04:14,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [740268629] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:04:14,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1360977352] [2021-12-21 12:04:14,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:04:14,041 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:04:14,042 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:04:14,056 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 12:04:14,066 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 12:04:14,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:14,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-21 12:04:14,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:04:14,357 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:04:14,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:04:14,489 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 12:04:14,489 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1360977352] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:04:14,489 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:04:14,489 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 16 [2021-12-21 12:04:14,490 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [804668340] [2021-12-21 12:04:14,490 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:04:14,491 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-21 12:04:14,492 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:04:14,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-21 12:04:14,493 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2021-12-21 12:04:14,493 INFO L87 Difference]: Start difference. First operand 54 states and 73 transitions. Second operand has 16 states, 16 states have (on average 2.625) internal successors, (42), 16 states have internal predecessors, (42), 4 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (5), 1 states have call predecessors, (5), 4 states have call successors, (5) [2021-12-21 12:04:14,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:04:14,693 INFO L93 Difference]: Finished difference Result 118 states and 165 transitions. [2021-12-21 12:04:14,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-21 12:04:14,694 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.625) internal successors, (42), 16 states have internal predecessors, (42), 4 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (5), 1 states have call predecessors, (5), 4 states have call successors, (5) Word has length 29 [2021-12-21 12:04:14,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:04:14,696 INFO L225 Difference]: With dead ends: 118 [2021-12-21 12:04:14,696 INFO L226 Difference]: Without dead ends: 82 [2021-12-21 12:04:14,696 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=76, Invalid=304, Unknown=0, NotChecked=0, Total=380 [2021-12-21 12:04:14,697 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 132 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 366 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:04:14,697 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [134 Valid, 366 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 177 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:04:14,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-12-21 12:04:14,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 63. [2021-12-21 12:04:14,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 48 states have (on average 1.375) internal successors, (66), 52 states have internal predecessors, (66), 10 states have call successors, (10), 3 states have call predecessors, (10), 4 states have return successors, (12), 7 states have call predecessors, (12), 9 states have call successors, (12) [2021-12-21 12:04:14,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 88 transitions. [2021-12-21 12:04:14,705 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 88 transitions. Word has length 29 [2021-12-21 12:04:14,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:04:14,706 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 88 transitions. [2021-12-21 12:04:14,706 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.625) internal successors, (42), 16 states have internal predecessors, (42), 4 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (5), 1 states have call predecessors, (5), 4 states have call successors, (5) [2021-12-21 12:04:14,706 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 88 transitions. [2021-12-21 12:04:14,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-21 12:04:14,707 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:04:14,707 INFO L514 BasicCegarLoop]: trace histogram [2, 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] [2021-12-21 12:04:14,730 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-12-21 12:04:14,927 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:04:14,928 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:04:14,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:04:14,928 INFO L85 PathProgramCache]: Analyzing trace with hash 162961828, now seen corresponding path program 1 times [2021-12-21 12:04:14,929 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:04:14,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2070422569] [2021-12-21 12:04:14,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:04:14,929 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:04:14,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:14,997 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-12-21 12:04:14,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:15,002 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-12-21 12:04:15,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:15,013 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-21 12:04:15,013 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:04:15,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2070422569] [2021-12-21 12:04:15,014 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2070422569] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:04:15,014 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 12:04:15,015 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-21 12:04:15,015 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719035832] [2021-12-21 12:04:15,015 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:04:15,015 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-21 12:04:15,015 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:04:15,016 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-21 12:04:15,016 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-21 12:04:15,016 INFO L87 Difference]: Start difference. First operand 63 states and 88 transitions. Second operand has 7 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-21 12:04:15,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:04:15,066 INFO L93 Difference]: Finished difference Result 75 states and 105 transitions. [2021-12-21 12:04:15,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-21 12:04:15,066 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 31 [2021-12-21 12:04:15,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:04:15,068 INFO L225 Difference]: With dead ends: 75 [2021-12-21 12:04:15,068 INFO L226 Difference]: Without dead ends: 73 [2021-12-21 12:04:15,068 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-12-21 12:04:15,070 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 7 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 301 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:04:15,071 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 301 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:04:15,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-12-21 12:04:15,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2021-12-21 12:04:15,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 53 states have (on average 1.3396226415094339) internal successors, (71), 58 states have internal predecessors, (71), 11 states have call successors, (11), 4 states have call predecessors, (11), 6 states have return successors, (19), 8 states have call predecessors, (19), 10 states have call successors, (19) [2021-12-21 12:04:15,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 101 transitions. [2021-12-21 12:04:15,082 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 101 transitions. Word has length 31 [2021-12-21 12:04:15,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:04:15,083 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 101 transitions. [2021-12-21 12:04:15,083 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-21 12:04:15,083 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 101 transitions. [2021-12-21 12:04:15,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-12-21 12:04:15,084 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:04:15,084 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 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, 1, 1, 1, 1] [2021-12-21 12:04:15,084 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-12-21 12:04:15,084 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:04:15,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:04:15,085 INFO L85 PathProgramCache]: Analyzing trace with hash 786337177, now seen corresponding path program 1 times [2021-12-21 12:04:15,085 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:04:15,085 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [196834177] [2021-12-21 12:04:15,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:04:15,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:04:15,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:15,181 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-12-21 12:04:15,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:15,196 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-12-21 12:04:15,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:15,203 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 12:04:15,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:15,208 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-21 12:04:15,208 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:04:15,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [196834177] [2021-12-21 12:04:15,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [196834177] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:04:15,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [727109761] [2021-12-21 12:04:15,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:04:15,208 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:04:15,208 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:04:15,218 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 12:04:15,219 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 12:04:15,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:15,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 50 conjunts are in the unsatisfiable core [2021-12-21 12:04:15,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:04:15,388 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 12:04:15,394 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2021-12-21 12:04:15,411 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 12:04:15,412 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2021-12-21 12:04:15,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 12:04:15,423 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-21 12:04:15,429 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 12:04:15,443 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-21 12:04:15,592 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-12-21 12:04:15,597 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-12-21 12:04:15,632 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-21 12:04:15,632 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:04:15,673 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 4 [2021-12-21 12:04:15,790 INFO L353 Elim1Store]: treesize reduction 21, result has 47.5 percent of original size [2021-12-21 12:04:15,790 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 25 treesize of output 31 [2021-12-21 12:04:15,794 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 24 [2021-12-21 12:04:15,797 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-12-21 12:04:15,803 INFO L353 Elim1Store]: treesize reduction 39, result has 2.5 percent of original size [2021-12-21 12:04:15,816 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 25 treesize of output 1 [2021-12-21 12:04:15,840 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-21 12:04:15,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [727109761] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:04:15,840 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:04:15,840 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 8, 7] total 16 [2021-12-21 12:04:15,840 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88109848] [2021-12-21 12:04:15,840 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:04:15,841 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-21 12:04:15,841 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:04:15,841 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-21 12:04:15,841 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2021-12-21 12:04:15,841 INFO L87 Difference]: Start difference. First operand 71 states and 101 transitions. Second operand has 16 states, 16 states have (on average 3.4375) internal successors, (55), 15 states have internal predecessors, (55), 4 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-21 12:04:16,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:04:16,264 INFO L93 Difference]: Finished difference Result 269 states and 401 transitions. [2021-12-21 12:04:16,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-12-21 12:04:16,264 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.4375) internal successors, (55), 15 states have internal predecessors, (55), 4 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) Word has length 37 [2021-12-21 12:04:16,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:04:16,266 INFO L225 Difference]: With dead ends: 269 [2021-12-21 12:04:16,267 INFO L226 Difference]: Without dead ends: 198 [2021-12-21 12:04:16,267 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=162, Invalid=708, Unknown=0, NotChecked=0, Total=870 [2021-12-21 12:04:16,268 INFO L933 BasicCegarLoop]: 103 mSDtfsCounter, 193 mSDsluCounter, 832 mSDsCounter, 0 mSdLazyCounter, 327 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 199 SdHoareTripleChecker+Valid, 935 SdHoareTripleChecker+Invalid, 431 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 55 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 12:04:16,268 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [199 Valid, 935 Invalid, 431 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 327 Invalid, 0 Unknown, 55 Unchecked, 0.2s Time] [2021-12-21 12:04:16,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-12-21 12:04:16,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 90. [2021-12-21 12:04:16,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 69 states have (on average 1.3333333333333333) internal successors, (92), 74 states have internal predecessors, (92), 13 states have call successors, (13), 5 states have call predecessors, (13), 7 states have return successors, (20), 10 states have call predecessors, (20), 12 states have call successors, (20) [2021-12-21 12:04:16,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 125 transitions. [2021-12-21 12:04:16,282 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 125 transitions. Word has length 37 [2021-12-21 12:04:16,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:04:16,283 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 125 transitions. [2021-12-21 12:04:16,283 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.4375) internal successors, (55), 15 states have internal predecessors, (55), 4 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-21 12:04:16,283 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 125 transitions. [2021-12-21 12:04:16,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-12-21 12:04:16,284 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:04:16,284 INFO L514 BasicCegarLoop]: trace histogram [2, 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, 1, 1] [2021-12-21 12:04:16,301 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 12:04:16,499 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,SelfDestructingSolverStorable5 [2021-12-21 12:04:16,500 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:04:16,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:04:16,500 INFO L85 PathProgramCache]: Analyzing trace with hash -1693334873, now seen corresponding path program 1 times [2021-12-21 12:04:16,500 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:04:16,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [356947607] [2021-12-21 12:04:16,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:04:16,500 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:04:16,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:16,564 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 12:04:16,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:16,568 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-21 12:04:16,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:16,571 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-12-21 12:04:16,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:16,573 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-21 12:04:16,574 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:04:16,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [356947607] [2021-12-21 12:04:16,574 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [356947607] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:04:16,574 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 12:04:16,574 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-21 12:04:16,574 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1673960202] [2021-12-21 12:04:16,574 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:04:16,575 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 12:04:16,575 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:04:16,575 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 12:04:16,575 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-21 12:04:16,575 INFO L87 Difference]: Start difference. First operand 90 states and 125 transitions. Second operand has 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-21 12:04:16,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:04:16,658 INFO L93 Difference]: Finished difference Result 133 states and 181 transitions. [2021-12-21 12:04:16,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-21 12:04:16,659 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 35 [2021-12-21 12:04:16,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:04:16,660 INFO L225 Difference]: With dead ends: 133 [2021-12-21 12:04:16,660 INFO L226 Difference]: Without dead ends: 102 [2021-12-21 12:04:16,660 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-12-21 12:04:16,661 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 20 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:04:16,661 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 169 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:04:16,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-12-21 12:04:16,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 92. [2021-12-21 12:04:16,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 71 states have (on average 1.323943661971831) internal successors, (94), 76 states have internal predecessors, (94), 13 states have call successors, (13), 5 states have call predecessors, (13), 7 states have return successors, (20), 10 states have call predecessors, (20), 12 states have call successors, (20) [2021-12-21 12:04:16,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 127 transitions. [2021-12-21 12:04:16,671 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 127 transitions. Word has length 35 [2021-12-21 12:04:16,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:04:16,671 INFO L470 AbstractCegarLoop]: Abstraction has 92 states and 127 transitions. [2021-12-21 12:04:16,671 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-21 12:04:16,671 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 127 transitions. [2021-12-21 12:04:16,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-12-21 12:04:16,673 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:04:16,673 INFO L514 BasicCegarLoop]: trace histogram [2, 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, 1, 1] [2021-12-21 12:04:16,673 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-12-21 12:04:16,673 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:04:16,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:04:16,674 INFO L85 PathProgramCache]: Analyzing trace with hash -1474480155, now seen corresponding path program 1 times [2021-12-21 12:04:16,674 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:04:16,674 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197763889] [2021-12-21 12:04:16,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:04:16,674 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:04:16,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:16,718 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 12:04:16,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:16,722 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-21 12:04:16,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:16,725 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-12-21 12:04:16,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:16,743 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-21 12:04:16,743 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:04:16,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1197763889] [2021-12-21 12:04:16,744 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1197763889] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:04:16,744 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 12:04:16,744 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-21 12:04:16,744 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1664648856] [2021-12-21 12:04:16,744 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:04:16,744 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-21 12:04:16,744 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:04:16,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-21 12:04:16,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-21 12:04:16,745 INFO L87 Difference]: Start difference. First operand 92 states and 127 transitions. Second operand has 6 states, 5 states have (on average 5.4) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-21 12:04:16,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:04:16,770 INFO L93 Difference]: Finished difference Result 99 states and 133 transitions. [2021-12-21 12:04:16,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 12:04:16,770 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.4) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 35 [2021-12-21 12:04:16,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:04:16,771 INFO L225 Difference]: With dead ends: 99 [2021-12-21 12:04:16,771 INFO L226 Difference]: Without dead ends: 92 [2021-12-21 12:04:16,771 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-12-21 12:04:16,772 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 5 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:04:16,772 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 243 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:04:16,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-12-21 12:04:16,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 80. [2021-12-21 12:04:16,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 63 states have (on average 1.3333333333333333) internal successors, (84), 66 states have internal predecessors, (84), 10 states have call successors, (10), 4 states have call predecessors, (10), 6 states have return successors, (15), 9 states have call predecessors, (15), 9 states have call successors, (15) [2021-12-21 12:04:16,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 109 transitions. [2021-12-21 12:04:16,779 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 109 transitions. Word has length 35 [2021-12-21 12:04:16,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:04:16,779 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 109 transitions. [2021-12-21 12:04:16,779 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.4) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-21 12:04:16,779 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 109 transitions. [2021-12-21 12:04:16,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-12-21 12:04:16,780 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:04:16,780 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:04:16,780 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-12-21 12:04:16,780 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:04:16,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:04:16,781 INFO L85 PathProgramCache]: Analyzing trace with hash 1846747895, now seen corresponding path program 1 times [2021-12-21 12:04:16,781 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:04:16,781 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1999244747] [2021-12-21 12:04:16,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:04:16,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:04:16,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:16,804 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 12:04:16,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:16,810 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-21 12:04:16,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:16,814 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-12-21 12:04:16,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:16,833 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 12:04:16,834 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:04:16,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1999244747] [2021-12-21 12:04:16,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1999244747] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:04:16,834 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 12:04:16,834 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-21 12:04:16,834 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310608877] [2021-12-21 12:04:16,834 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:04:16,834 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 12:04:16,834 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:04:16,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 12:04:16,835 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-21 12:04:16,835 INFO L87 Difference]: Start difference. First operand 80 states and 109 transitions. Second operand has 5 states, 5 states have (on average 5.8) internal successors, (29), 5 states have internal predecessors, (29), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-21 12:04:16,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:04:16,883 INFO L93 Difference]: Finished difference Result 130 states and 171 transitions. [2021-12-21 12:04:16,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-21 12:04:16,883 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.8) internal successors, (29), 5 states have internal predecessors, (29), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 36 [2021-12-21 12:04:16,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:04:16,884 INFO L225 Difference]: With dead ends: 130 [2021-12-21 12:04:16,884 INFO L226 Difference]: Without dead ends: 62 [2021-12-21 12:04:16,884 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-21 12:04:16,885 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 16 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:04:16,885 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 147 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:04:16,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-12-21 12:04:16,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 60. [2021-12-21 12:04:16,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 46 states have (on average 1.3043478260869565) internal successors, (60), 48 states have internal predecessors, (60), 8 states have call successors, (8), 4 states have call predecessors, (8), 5 states have return successors, (11), 7 states have call predecessors, (11), 7 states have call successors, (11) [2021-12-21 12:04:16,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 79 transitions. [2021-12-21 12:04:16,890 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 79 transitions. Word has length 36 [2021-12-21 12:04:16,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:04:16,891 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 79 transitions. [2021-12-21 12:04:16,891 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.8) internal successors, (29), 5 states have internal predecessors, (29), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-21 12:04:16,891 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 79 transitions. [2021-12-21 12:04:16,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-12-21 12:04:16,892 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:04:16,892 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 2, 2, 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] [2021-12-21 12:04:16,892 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-12-21 12:04:16,892 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:04:16,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:04:16,892 INFO L85 PathProgramCache]: Analyzing trace with hash -827934680, now seen corresponding path program 1 times [2021-12-21 12:04:16,892 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:04:16,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [254174412] [2021-12-21 12:04:16,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:04:16,893 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:04:16,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:16,974 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-21 12:04:16,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:17,012 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 12:04:17,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:17,035 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-12-21 12:04:17,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:17,039 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 12:04:17,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:17,042 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 1 proven. 22 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-21 12:04:17,042 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:04:17,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [254174412] [2021-12-21 12:04:17,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [254174412] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:04:17,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1355055471] [2021-12-21 12:04:17,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:04:17,042 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:04:17,042 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:04:17,043 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 12:04:17,044 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 12:04:17,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:17,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 45 conjunts are in the unsatisfiable core [2021-12-21 12:04:17,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:04:17,162 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 12:04:17,189 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-21 12:04:17,189 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-12-21 12:04:17,214 INFO L353 Elim1Store]: treesize reduction 30, result has 38.8 percent of original size [2021-12-21 12:04:17,215 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 40 treesize of output 55 [2021-12-21 12:04:17,222 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 9 [2021-12-21 12:04:17,230 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 15 [2021-12-21 12:04:17,261 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 9 [2021-12-21 12:04:17,272 INFO L353 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-12-21 12:04:17,272 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 55 treesize of output 46 [2021-12-21 12:04:17,274 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 18 [2021-12-21 12:04:17,347 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-21 12:04:17,348 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:04:17,523 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-21 12:04:17,524 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 124 treesize of output 127 [2021-12-21 12:04:17,527 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 152 treesize of output 144 [2021-12-21 12:04:17,531 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 144 treesize of output 140 [2021-12-21 12:04:17,577 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-12-21 12:04:17,584 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 4 [2021-12-21 12:04:17,686 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-12-21 12:04:17,696 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-21 12:04:17,697 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1355055471] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:04:17,697 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:04:17,697 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 17 [2021-12-21 12:04:17,697 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [632596393] [2021-12-21 12:04:17,697 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:04:17,699 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-21 12:04:17,700 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:04:17,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-21 12:04:17,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-12-21 12:04:17,700 INFO L87 Difference]: Start difference. First operand 60 states and 79 transitions. Second operand has 17 states, 15 states have (on average 3.3333333333333335) internal successors, (50), 17 states have internal predecessors, (50), 5 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 3 states have call predecessors, (7), 5 states have call successors, (7) [2021-12-21 12:04:18,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:04:18,138 INFO L93 Difference]: Finished difference Result 172 states and 253 transitions. [2021-12-21 12:04:18,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-12-21 12:04:18,138 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 3.3333333333333335) internal successors, (50), 17 states have internal predecessors, (50), 5 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 3 states have call predecessors, (7), 5 states have call successors, (7) Word has length 46 [2021-12-21 12:04:18,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:04:18,139 INFO L225 Difference]: With dead ends: 172 [2021-12-21 12:04:18,139 INFO L226 Difference]: Without dead ends: 131 [2021-12-21 12:04:18,140 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 89 SyntacticMatches, 4 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=119, Invalid=583, Unknown=0, NotChecked=0, Total=702 [2021-12-21 12:04:18,140 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 123 mSDsluCounter, 468 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 544 SdHoareTripleChecker+Invalid, 603 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 92 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-21 12:04:18,141 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [129 Valid, 544 Invalid, 603 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 465 Invalid, 0 Unknown, 92 Unchecked, 0.3s Time] [2021-12-21 12:04:18,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-12-21 12:04:18,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 86. [2021-12-21 12:04:18,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 66 states have (on average 1.3333333333333333) internal successors, (88), 69 states have internal predecessors, (88), 13 states have call successors, (13), 4 states have call predecessors, (13), 6 states have return successors, (23), 12 states have call predecessors, (23), 12 states have call successors, (23) [2021-12-21 12:04:18,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 124 transitions. [2021-12-21 12:04:18,157 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 124 transitions. Word has length 46 [2021-12-21 12:04:18,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:04:18,157 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 124 transitions. [2021-12-21 12:04:18,157 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 3.3333333333333335) internal successors, (50), 17 states have internal predecessors, (50), 5 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 3 states have call predecessors, (7), 5 states have call successors, (7) [2021-12-21 12:04:18,158 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 124 transitions. [2021-12-21 12:04:18,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-21 12:04:18,160 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:04:18,160 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 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] [2021-12-21 12:04:18,180 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 12:04:18,380 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:04:18,380 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:04:18,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:04:18,381 INFO L85 PathProgramCache]: Analyzing trace with hash 803799756, now seen corresponding path program 1 times [2021-12-21 12:04:18,381 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:04:18,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [616916171] [2021-12-21 12:04:18,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:04:18,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:04:18,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:18,573 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-12-21 12:04:18,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:18,578 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 12:04:18,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:18,585 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-12-21 12:04:18,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:18,630 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 12:04:18,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:18,659 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-21 12:04:18,659 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:04:18,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [616916171] [2021-12-21 12:04:18,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [616916171] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:04:18,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [403863291] [2021-12-21 12:04:18,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:04:18,660 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:04:18,660 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:04:18,668 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 12:04:18,669 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 12:04:18,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:18,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 92 conjunts are in the unsatisfiable core [2021-12-21 12:04:18,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:04:18,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 12:04:18,846 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2021-12-21 12:04:18,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 12:04:18,850 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 23 [2021-12-21 12:04:18,857 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 12:04:18,859 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2021-12-21 12:04:18,863 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 12:04:18,864 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 23 [2021-12-21 12:04:19,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 12:04:19,449 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-21 12:04:19,455 INFO L353 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2021-12-21 12:04:19,456 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 52 [2021-12-21 12:04:19,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 12:04:19,461 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 74 treesize of output 52 [2021-12-21 12:04:22,408 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-21 12:04:22,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:04:22,506 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 4 [2021-12-21 12:04:22,679 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 4 [2021-12-21 12:04:23,010 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-21 12:04:23,016 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-21 12:04:23,016 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 182 treesize of output 174 [2021-12-21 12:04:23,019 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-21 12:04:23,023 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-21 12:04:23,024 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 182 treesize of output 109 [2021-12-21 12:04:23,046 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-21 12:04:23,047 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 700 treesize of output 686 [2021-12-21 12:04:23,074 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-21 12:04:23,075 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 876 treesize of output 822 [2021-12-21 12:04:23,088 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 814 treesize of output 792 [2021-12-21 12:04:23,100 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-21 12:04:23,108 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-21 12:04:23,109 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 986 treesize of output 872 [2021-12-21 12:04:24,773 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 4 [2021-12-21 12:04:24,827 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-12-21 12:04:24,882 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 4 [2021-12-21 12:04:24,904 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 4 [2021-12-21 12:04:25,337 INFO L353 Elim1Store]: treesize reduction 14, result has 57.6 percent of original size [2021-12-21 12:04:25,337 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 166 treesize of output 158 [2021-12-21 12:04:25,735 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-21 12:04:25,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [403863291] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:04:25,736 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:04:25,736 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 42 [2021-12-21 12:04:25,736 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725576051] [2021-12-21 12:04:25,736 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:04:25,736 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-12-21 12:04:25,736 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:04:25,736 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-12-21 12:04:25,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=1559, Unknown=6, NotChecked=0, Total=1722 [2021-12-21 12:04:25,737 INFO L87 Difference]: Start difference. First operand 86 states and 124 transitions. Second operand has 42 states, 39 states have (on average 1.9743589743589745) internal successors, (77), 41 states have internal predecessors, (77), 11 states have call successors, (11), 4 states have call predecessors, (11), 7 states have return successors, (10), 8 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-21 12:04:30,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:04:30,158 INFO L93 Difference]: Finished difference Result 272 states and 405 transitions. [2021-12-21 12:04:30,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-12-21 12:04:30,158 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 39 states have (on average 1.9743589743589745) internal successors, (77), 41 states have internal predecessors, (77), 11 states have call successors, (11), 4 states have call predecessors, (11), 7 states have return successors, (10), 8 states have call predecessors, (10), 10 states have call successors, (10) Word has length 43 [2021-12-21 12:04:30,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:04:30,160 INFO L225 Difference]: With dead ends: 272 [2021-12-21 12:04:30,160 INFO L226 Difference]: Without dead ends: 199 [2021-12-21 12:04:30,161 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1041 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=481, Invalid=4065, Unknown=10, NotChecked=0, Total=4556 [2021-12-21 12:04:30,162 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 379 mSDsluCounter, 1323 mSDsCounter, 0 mSdLazyCounter, 1404 mSolverCounterSat, 332 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 381 SdHoareTripleChecker+Valid, 1429 SdHoareTripleChecker+Invalid, 2115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 332 IncrementalHoareTripleChecker+Valid, 1404 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 379 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-12-21 12:04:30,162 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [381 Valid, 1429 Invalid, 2115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [332 Valid, 1404 Invalid, 0 Unknown, 379 Unchecked, 1.2s Time] [2021-12-21 12:04:30,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2021-12-21 12:04:30,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 110. [2021-12-21 12:04:30,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 82 states have (on average 1.3048780487804879) internal successors, (107), 89 states have internal predecessors, (107), 16 states have call successors, (16), 6 states have call predecessors, (16), 11 states have return successors, (30), 14 states have call predecessors, (30), 15 states have call successors, (30) [2021-12-21 12:04:30,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 153 transitions. [2021-12-21 12:04:30,172 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 153 transitions. Word has length 43 [2021-12-21 12:04:30,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:04:30,173 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 153 transitions. [2021-12-21 12:04:30,173 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 39 states have (on average 1.9743589743589745) internal successors, (77), 41 states have internal predecessors, (77), 11 states have call successors, (11), 4 states have call predecessors, (11), 7 states have return successors, (10), 8 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-21 12:04:30,173 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 153 transitions. [2021-12-21 12:04:30,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-12-21 12:04:30,174 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:04:30,174 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 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 12:04:30,193 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 12:04:30,379 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:04:30,380 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:04:30,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:04:30,380 INFO L85 PathProgramCache]: Analyzing trace with hash 1251374562, now seen corresponding path program 1 times [2021-12-21 12:04:30,380 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:04:30,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [449048601] [2021-12-21 12:04:30,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:04:30,380 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:04:30,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:30,421 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-12-21 12:04:30,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:30,424 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 12:04:30,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:30,427 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-12-21 12:04:30,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:30,446 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 12:04:30,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:30,451 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-12-21 12:04:30,451 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:04:30,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [449048601] [2021-12-21 12:04:30,452 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [449048601] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:04:30,452 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 12:04:30,452 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-12-21 12:04:30,453 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [144774339] [2021-12-21 12:04:30,454 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:04:30,454 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-21 12:04:30,454 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:04:30,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-21 12:04:30,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-12-21 12:04:30,455 INFO L87 Difference]: Start difference. First operand 110 states and 153 transitions. Second operand has 8 states, 7 states have (on average 3.857142857142857) internal successors, (27), 5 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-21 12:04:30,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:04:30,494 INFO L93 Difference]: Finished difference Result 134 states and 189 transitions. [2021-12-21 12:04:30,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-21 12:04:30,494 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.857142857142857) internal successors, (27), 5 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 44 [2021-12-21 12:04:30,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:04:30,497 INFO L225 Difference]: With dead ends: 134 [2021-12-21 12:04:30,497 INFO L226 Difference]: Without dead ends: 132 [2021-12-21 12:04:30,498 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-12-21 12:04:30,499 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 7 mSDsluCounter, 293 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 345 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:04:30,499 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 345 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:04:30,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-12-21 12:04:30,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 113. [2021-12-21 12:04:30,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 84 states have (on average 1.2976190476190477) internal successors, (109), 91 states have internal predecessors, (109), 16 states have call successors, (16), 6 states have call predecessors, (16), 12 states have return successors, (39), 15 states have call predecessors, (39), 15 states have call successors, (39) [2021-12-21 12:04:30,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 164 transitions. [2021-12-21 12:04:30,510 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 164 transitions. Word has length 44 [2021-12-21 12:04:30,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:04:30,511 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 164 transitions. [2021-12-21 12:04:30,511 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.857142857142857) internal successors, (27), 5 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-21 12:04:30,511 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 164 transitions. [2021-12-21 12:04:30,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-21 12:04:30,512 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:04:30,512 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 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] [2021-12-21 12:04:30,512 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-12-21 12:04:30,512 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:04:30,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:04:30,513 INFO L85 PathProgramCache]: Analyzing trace with hash -13848694, now seen corresponding path program 1 times [2021-12-21 12:04:30,513 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:04:30,513 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [810741960] [2021-12-21 12:04:30,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:04:30,513 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:04:30,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:30,656 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-12-21 12:04:30,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:30,689 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 12:04:30,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:30,694 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-12-21 12:04:30,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:30,698 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 12:04:30,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:30,702 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-21 12:04:30,702 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:04:30,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [810741960] [2021-12-21 12:04:30,702 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [810741960] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:04:30,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [482691078] [2021-12-21 12:04:30,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:04:30,703 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:04:30,703 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:04:30,704 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 12:04:30,705 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 12:04:30,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:30,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 43 conjunts are in the unsatisfiable core [2021-12-21 12:04:30,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:04:30,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 12:04:30,880 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2021-12-21 12:04:30,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 12:04:30,884 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-12-21 12:04:31,094 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 12 [2021-12-21 12:04:31,131 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 19 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-21 12:04:31,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:04:31,171 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 4 [2021-12-21 12:04:31,308 INFO L353 Elim1Store]: treesize reduction 21, result has 47.5 percent of original size [2021-12-21 12:04:31,309 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 23 treesize of output 29 [2021-12-21 12:04:31,311 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 22 [2021-12-21 12:04:31,313 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-12-21 12:04:31,378 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-12-21 12:04:31,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [482691078] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:04:31,378 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:04:31,378 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9, 9] total 27 [2021-12-21 12:04:31,378 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111352035] [2021-12-21 12:04:31,378 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:04:31,378 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-21 12:04:31,379 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:04:31,379 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-21 12:04:31,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=636, Unknown=0, NotChecked=0, Total=702 [2021-12-21 12:04:31,379 INFO L87 Difference]: Start difference. First operand 113 states and 164 transitions. Second operand has 27 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 27 states have internal predecessors, (67), 7 states have call successors, (10), 3 states have call predecessors, (10), 4 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2021-12-21 12:04:32,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:04:32,633 INFO L93 Difference]: Finished difference Result 238 states and 355 transitions. [2021-12-21 12:04:32,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-12-21 12:04:32,634 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 27 states have internal predecessors, (67), 7 states have call successors, (10), 3 states have call predecessors, (10), 4 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) Word has length 43 [2021-12-21 12:04:32,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:04:32,638 INFO L225 Difference]: With dead ends: 238 [2021-12-21 12:04:32,638 INFO L226 Difference]: Without dead ends: 157 [2021-12-21 12:04:32,639 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 393 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=415, Invalid=2237, Unknown=0, NotChecked=0, Total=2652 [2021-12-21 12:04:32,639 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 315 mSDsluCounter, 1003 mSDsCounter, 0 mSdLazyCounter, 766 mSolverCounterSat, 171 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 315 SdHoareTripleChecker+Valid, 1070 SdHoareTripleChecker+Invalid, 1009 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 171 IncrementalHoareTripleChecker+Valid, 766 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 72 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-21 12:04:32,640 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [315 Valid, 1070 Invalid, 1009 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [171 Valid, 766 Invalid, 0 Unknown, 72 Unchecked, 0.4s Time] [2021-12-21 12:04:32,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-12-21 12:04:32,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 141. [2021-12-21 12:04:32,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 104 states have (on average 1.2596153846153846) internal successors, (131), 111 states have internal predecessors, (131), 22 states have call successors, (22), 9 states have call predecessors, (22), 14 states have return successors, (49), 20 states have call predecessors, (49), 20 states have call successors, (49) [2021-12-21 12:04:32,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 202 transitions. [2021-12-21 12:04:32,652 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 202 transitions. Word has length 43 [2021-12-21 12:04:32,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:04:32,652 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 202 transitions. [2021-12-21 12:04:32,652 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 27 states have internal predecessors, (67), 7 states have call successors, (10), 3 states have call predecessors, (10), 4 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2021-12-21 12:04:32,652 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 202 transitions. [2021-12-21 12:04:32,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-12-21 12:04:32,653 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:04:32,653 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:04:32,673 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-12-21 12:04:32,871 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-12-21 12:04:32,872 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:04:32,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:04:32,872 INFO L85 PathProgramCache]: Analyzing trace with hash -1248112818, now seen corresponding path program 2 times [2021-12-21 12:04:32,872 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:04:32,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [562751117] [2021-12-21 12:04:32,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:04:32,872 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:04:32,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:33,279 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-12-21 12:04:33,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:33,308 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 12:04:33,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:33,311 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-12-21 12:04:33,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:33,318 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 12:04:33,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:33,321 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-12-21 12:04:33,321 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:04:33,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [562751117] [2021-12-21 12:04:33,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [562751117] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:04:33,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1379466036] [2021-12-21 12:04:33,322 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:04:33,322 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:04:33,322 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:04:33,323 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 12:04:33,324 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 12:04:33,446 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:04:33,446 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:04:33,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 413 conjuncts, 92 conjunts are in the unsatisfiable core [2021-12-21 12:04:33,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:04:33,488 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 12:04:33,528 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 12:04:33,528 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-21 12:04:33,529 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2021-12-21 12:04:33,540 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-21 12:04:33,540 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 27 [2021-12-21 12:04:33,547 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 12:04:33,548 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 7 [2021-12-21 12:04:33,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 12:04:33,563 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2021-12-21 12:04:33,573 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-21 12:04:33,574 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 27 [2021-12-21 12:04:33,586 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 12:04:33,591 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 7 [2021-12-21 12:04:33,740 INFO L353 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-12-21 12:04:33,740 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-12-21 12:04:33,818 INFO L353 Elim1Store]: treesize reduction 20, result has 48.7 percent of original size [2021-12-21 12:04:33,818 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 31 treesize of output 41 [2021-12-21 12:04:33,836 INFO L353 Elim1Store]: treesize reduction 20, result has 48.7 percent of original size [2021-12-21 12:04:33,837 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 31 treesize of output 41 [2021-12-21 12:04:33,944 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-21 12:04:33,945 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-12-21 12:04:33,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 12:04:33,998 INFO L353 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2021-12-21 12:04:33,998 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 50 [2021-12-21 12:04:34,017 INFO L353 Elim1Store]: treesize reduction 20, result has 48.7 percent of original size [2021-12-21 12:04:34,018 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 31 treesize of output 41 [2021-12-21 12:04:34,059 INFO L353 Elim1Store]: treesize reduction 20, result has 48.7 percent of original size [2021-12-21 12:04:34,059 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 44 treesize of output 53 [2021-12-21 12:04:34,115 INFO L353 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-12-21 12:04:34,115 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 7 [2021-12-21 12:04:38,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 12:04:38,304 INFO L353 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-12-21 12:04:38,304 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 52 treesize of output 26 [2021-12-21 12:04:38,315 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 12:04:38,316 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 15 [2021-12-21 12:04:38,421 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 21 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-21 12:04:38,422 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:04:38,497 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 4 [2021-12-21 12:04:39,102 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-21 12:04:39,108 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-21 12:04:39,108 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 89 treesize of output 82 [2021-12-21 12:04:39,124 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-21 12:04:39,125 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 665 treesize of output 653 [2021-12-21 12:04:39,131 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 825 treesize of output 793 [2021-12-21 12:04:39,150 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-21 12:04:39,155 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-21 12:04:39,156 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 673 treesize of output 678 [2021-12-21 12:04:39,164 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-21 12:04:39,164 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 926 treesize of output 904 [2021-12-21 12:04:39,173 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 904 treesize of output 896 [2021-12-21 12:04:39,197 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 849 treesize of output 785 [2021-12-21 12:04:39,206 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 785 treesize of output 769 [2021-12-21 12:04:39,214 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 769 treesize of output 737 [2021-12-21 12:04:40,527 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-21 12:04:40,527 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 9 [2021-12-21 12:04:40,581 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-12-21 12:04:40,585 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-12-21 12:04:40,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1379466036] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:04:40,586 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:04:40,586 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 14] total 33 [2021-12-21 12:04:40,586 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [516848074] [2021-12-21 12:04:40,586 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:04:40,586 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-12-21 12:04:40,586 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:04:40,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-12-21 12:04:40,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=897, Unknown=7, NotChecked=0, Total=1056 [2021-12-21 12:04:40,587 INFO L87 Difference]: Start difference. First operand 141 states and 202 transitions. Second operand has 33 states, 33 states have (on average 2.4242424242424243) internal successors, (80), 32 states have internal predecessors, (80), 6 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-12-21 12:04:41,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:04:41,407 INFO L93 Difference]: Finished difference Result 255 states and 358 transitions. [2021-12-21 12:04:41,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-12-21 12:04:41,407 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.4242424242424243) internal successors, (80), 32 states have internal predecessors, (80), 6 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 49 [2021-12-21 12:04:41,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:04:41,408 INFO L225 Difference]: With dead ends: 255 [2021-12-21 12:04:41,409 INFO L226 Difference]: Without dead ends: 214 [2021-12-21 12:04:41,409 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 85 SyntacticMatches, 4 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 555 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=357, Invalid=1705, Unknown=8, NotChecked=0, Total=2070 [2021-12-21 12:04:41,410 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 147 mSDsluCounter, 814 mSDsCounter, 0 mSdLazyCounter, 333 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 156 SdHoareTripleChecker+Valid, 878 SdHoareTripleChecker+Invalid, 687 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 333 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 288 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 12:04:41,410 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [156 Valid, 878 Invalid, 687 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 333 Invalid, 0 Unknown, 288 Unchecked, 0.2s Time] [2021-12-21 12:04:41,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2021-12-21 12:04:41,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 165. [2021-12-21 12:04:41,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 122 states have (on average 1.2377049180327868) internal successors, (151), 130 states have internal predecessors, (151), 23 states have call successors, (23), 12 states have call predecessors, (23), 19 states have return successors, (51), 22 states have call predecessors, (51), 21 states have call successors, (51) [2021-12-21 12:04:41,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 225 transitions. [2021-12-21 12:04:41,424 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 225 transitions. Word has length 49 [2021-12-21 12:04:41,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:04:41,424 INFO L470 AbstractCegarLoop]: Abstraction has 165 states and 225 transitions. [2021-12-21 12:04:41,425 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.4242424242424243) internal successors, (80), 32 states have internal predecessors, (80), 6 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-12-21 12:04:41,425 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 225 transitions. [2021-12-21 12:04:41,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-12-21 12:04:41,425 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:04:41,426 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:04:41,443 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 12:04:41,639 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:04:41,639 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:04:41,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:04:41,640 INFO L85 PathProgramCache]: Analyzing trace with hash 1865771786, now seen corresponding path program 1 times [2021-12-21 12:04:41,640 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:04:41,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2005852331] [2021-12-21 12:04:41,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:04:41,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:04:41,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:41,677 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-12-21 12:04:41,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:41,695 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 12:04:41,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:41,698 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-12-21 12:04:41,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:41,700 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2021-12-21 12:04:41,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:41,702 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-12-21 12:04:41,702 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:04:41,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2005852331] [2021-12-21 12:04:41,702 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2005852331] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:04:41,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1868142291] [2021-12-21 12:04:41,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:04:41,703 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:04:41,703 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:04:41,704 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 12:04:41,705 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 12:04:41,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:41,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-21 12:04:41,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:04:41,878 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-21 12:04:41,878 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:04:41,953 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-21 12:04:41,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1868142291] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:04:41,954 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:04:41,954 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-12-21 12:04:41,954 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251018945] [2021-12-21 12:04:41,954 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:04:41,955 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-21 12:04:41,955 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:04:41,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-21 12:04:41,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-12-21 12:04:41,955 INFO L87 Difference]: Start difference. First operand 165 states and 225 transitions. Second operand has 12 states, 12 states have (on average 5.583333333333333) internal successors, (67), 12 states have internal predecessors, (67), 5 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) [2021-12-21 12:04:42,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:04:42,064 INFO L93 Difference]: Finished difference Result 227 states and 306 transitions. [2021-12-21 12:04:42,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-21 12:04:42,065 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 5.583333333333333) internal successors, (67), 12 states have internal predecessors, (67), 5 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) Word has length 46 [2021-12-21 12:04:42,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:04:42,067 INFO L225 Difference]: With dead ends: 227 [2021-12-21 12:04:42,067 INFO L226 Difference]: Without dead ends: 157 [2021-12-21 12:04:42,068 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=58, Invalid=182, Unknown=0, NotChecked=0, Total=240 [2021-12-21 12:04:42,069 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 121 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 158 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:04:42,069 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [121 Valid, 158 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:04:42,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-12-21 12:04:42,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 152. [2021-12-21 12:04:42,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 112 states have (on average 1.1964285714285714) internal successors, (134), 118 states have internal predecessors, (134), 21 states have call successors, (21), 12 states have call predecessors, (21), 18 states have return successors, (47), 21 states have call predecessors, (47), 19 states have call successors, (47) [2021-12-21 12:04:42,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 202 transitions. [2021-12-21 12:04:42,085 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 202 transitions. Word has length 46 [2021-12-21 12:04:42,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:04:42,085 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 202 transitions. [2021-12-21 12:04:42,086 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 5.583333333333333) internal successors, (67), 12 states have internal predecessors, (67), 5 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) [2021-12-21 12:04:42,086 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 202 transitions. [2021-12-21 12:04:42,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-12-21 12:04:42,088 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:04:42,088 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 3, 3, 3, 3, 3, 2, 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 12:04:42,106 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 12:04:42,299 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:04:42,301 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:04:42,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:04:42,302 INFO L85 PathProgramCache]: Analyzing trace with hash 604583819, now seen corresponding path program 2 times [2021-12-21 12:04:42,302 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:04:42,302 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1956159824] [2021-12-21 12:04:42,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:04:42,302 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:04:42,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:42,480 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-12-21 12:04:42,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:42,485 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 12:04:42,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:42,487 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-12-21 12:04:42,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:42,540 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 12:04:42,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:42,545 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 12:04:42,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:04:42,547 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 14 proven. 5 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-12-21 12:04:42,547 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:04:42,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1956159824] [2021-12-21 12:04:42,548 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1956159824] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:04:42,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [837547577] [2021-12-21 12:04:42,548 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:04:42,548 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:04:42,548 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:04:42,549 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:04:42,550 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-21 12:04:42,664 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:04:42,664 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:04:42,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 87 conjunts are in the unsatisfiable core [2021-12-21 12:04:42,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:04:42,700 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 12:04:42,701 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2021-12-21 12:04:42,709 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-21 12:04:42,710 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 20 [2021-12-21 12:04:42,715 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-21 12:04:42,721 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 12:04:42,722 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2021-12-21 12:04:42,732 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-21 12:04:42,733 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 20 [2021-12-21 12:04:42,736 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-21 12:04:43,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 12:04:43,023 INFO L353 Elim1Store]: treesize reduction 64, result has 32.6 percent of original size [2021-12-21 12:04:43,023 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 83 treesize of output 80 [2021-12-21 12:04:43,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 12:04:43,053 INFO L353 Elim1Store]: treesize reduction 46, result has 35.2 percent of original size [2021-12-21 12:04:43,054 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 78 treesize of output 73 [2021-12-21 12:04:58,307 WARN L227 SmtUtils]: Spent 6.03s on a formula simplification that was a NOOP. DAG size: 40 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-21 12:05:10,019 WARN L227 SmtUtils]: Spent 6.03s on a formula simplification that was a NOOP. DAG size: 51 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-21 12:05:22,206 WARN L227 SmtUtils]: Spent 6.03s on a formula simplification that was a NOOP. DAG size: 43 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)