./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/array-tiling/pnr4.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version ae007674 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/array-tiling/pnr4.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash c2f943c7ce97bf9be3e11b9d2df150d740ebe8f456342884d8ad0d40610fb008 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-ae00767 [2021-12-27 21:31:26,393 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-27 21:31:26,395 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-27 21:31:26,432 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-27 21:31:26,433 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-27 21:31:26,436 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-27 21:31:26,437 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-27 21:31:26,442 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-27 21:31:26,444 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-27 21:31:26,447 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-27 21:31:26,448 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-27 21:31:26,452 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-27 21:31:26,457 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-27 21:31:26,459 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-27 21:31:26,460 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-27 21:31:26,463 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-27 21:31:26,464 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-27 21:31:26,464 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-27 21:31:26,466 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-27 21:31:26,472 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-27 21:31:26,473 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-27 21:31:26,474 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-27 21:31:26,475 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-27 21:31:26,476 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-27 21:31:26,482 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-27 21:31:26,482 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-27 21:31:26,483 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-27 21:31:26,484 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-27 21:31:26,484 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-27 21:31:26,485 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-27 21:31:26,485 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-27 21:31:26,486 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-27 21:31:26,487 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-27 21:31:26,488 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-27 21:31:26,489 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-27 21:31:26,489 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-27 21:31:26,490 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-27 21:31:26,490 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-27 21:31:26,490 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-27 21:31:26,492 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-27 21:31:26,492 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-27 21:31:26,496 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-27 21:31:26,531 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-27 21:31:26,531 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-27 21:31:26,532 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-27 21:31:26,532 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-27 21:31:26,533 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-27 21:31:26,533 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-27 21:31:26,534 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-27 21:31:26,535 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-27 21:31:26,535 INFO L138 SettingsManager]: * Use SBE=true [2021-12-27 21:31:26,535 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-27 21:31:26,536 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-27 21:31:26,536 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-27 21:31:26,536 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-27 21:31:26,536 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-27 21:31:26,537 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-27 21:31:26,537 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-27 21:31:26,537 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-27 21:31:26,537 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-27 21:31:26,537 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-27 21:31:26,538 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-27 21:31:26,538 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-27 21:31:26,538 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-27 21:31:26,538 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-27 21:31:26,538 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-27 21:31:26,539 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-27 21:31:26,539 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-27 21:31:26,539 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-27 21:31:26,539 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-27 21:31:26,539 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-27 21:31:26,540 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-27 21:31:26,540 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-27 21:31:26,540 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-27 21:31:26,540 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-27 21:31:26,540 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c2f943c7ce97bf9be3e11b9d2df150d740ebe8f456342884d8ad0d40610fb008 [2021-12-27 21:31:26,831 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-27 21:31:26,850 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-27 21:31:26,852 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-27 21:31:26,853 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-27 21:31:26,855 INFO L275 PluginConnector]: CDTParser initialized [2021-12-27 21:31:26,856 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-tiling/pnr4.c [2021-12-27 21:31:26,917 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/efc4f7b77/b54490f83ee54e9aa720eaefba518ac0/FLAG45e4bb44f [2021-12-27 21:31:27,342 INFO L306 CDTParser]: Found 1 translation units. [2021-12-27 21:31:27,344 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-tiling/pnr4.c [2021-12-27 21:31:27,350 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/efc4f7b77/b54490f83ee54e9aa720eaefba518ac0/FLAG45e4bb44f [2021-12-27 21:31:27,365 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/efc4f7b77/b54490f83ee54e9aa720eaefba518ac0 [2021-12-27 21:31:27,367 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-27 21:31:27,369 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-27 21:31:27,373 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-27 21:31:27,373 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-27 21:31:27,376 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-27 21:31:27,376 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.12 09:31:27" (1/1) ... [2021-12-27 21:31:27,377 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@786a516d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 09:31:27, skipping insertion in model container [2021-12-27 21:31:27,377 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.12 09:31:27" (1/1) ... [2021-12-27 21:31:27,383 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-27 21:31:27,397 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-27 21:31:27,539 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/array-tiling/pnr4.c[395,408] [2021-12-27 21:31:27,606 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-27 21:31:27,621 INFO L203 MainTranslator]: Completed pre-run [2021-12-27 21:31:27,635 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/array-tiling/pnr4.c[395,408] [2021-12-27 21:31:27,655 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-27 21:31:27,667 INFO L208 MainTranslator]: Completed translation [2021-12-27 21:31:27,668 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 09:31:27 WrapperNode [2021-12-27 21:31:27,668 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-27 21:31:27,669 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-27 21:31:27,670 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-27 21:31:27,670 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-27 21:31:27,676 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 09:31:27" (1/1) ... [2021-12-27 21:31:27,687 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 09:31:27" (1/1) ... [2021-12-27 21:31:27,702 INFO L137 Inliner]: procedures = 17, calls = 30, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 91 [2021-12-27 21:31:27,704 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-27 21:31:27,704 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-27 21:31:27,705 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-27 21:31:27,705 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-27 21:31:27,710 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 09:31:27" (1/1) ... [2021-12-27 21:31:27,710 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 09:31:27" (1/1) ... [2021-12-27 21:31:27,715 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 09:31:27" (1/1) ... [2021-12-27 21:31:27,716 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 09:31:27" (1/1) ... [2021-12-27 21:31:27,725 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 09:31:27" (1/1) ... [2021-12-27 21:31:27,734 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 09:31:27" (1/1) ... [2021-12-27 21:31:27,736 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 09:31:27" (1/1) ... [2021-12-27 21:31:27,743 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-27 21:31:27,745 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-27 21:31:27,745 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-27 21:31:27,746 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-27 21:31:27,746 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 09:31:27" (1/1) ... [2021-12-27 21:31:27,752 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-27 21:31:27,761 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:31:27,772 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) [2021-12-27 21:31:27,774 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 [2021-12-27 21:31:27,801 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-27 21:31:27,801 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-27 21:31:27,801 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-12-27 21:31:27,802 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-27 21:31:27,802 INFO L130 BoogieDeclarations]: Found specification of procedure ReadFromPort [2021-12-27 21:31:27,802 INFO L138 BoogieDeclarations]: Found implementation of procedure ReadFromPort [2021-12-27 21:31:27,802 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-27 21:31:27,806 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-27 21:31:27,806 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-12-27 21:31:27,853 INFO L234 CfgBuilder]: Building ICFG [2021-12-27 21:31:27,854 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-27 21:31:28,071 INFO L275 CfgBuilder]: Performing block encoding [2021-12-27 21:31:28,080 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-27 21:31:28,086 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-12-27 21:31:28,088 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.12 09:31:28 BoogieIcfgContainer [2021-12-27 21:31:28,103 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-27 21:31:28,104 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-27 21:31:28,105 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-27 21:31:28,107 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-27 21:31:28,107 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.12 09:31:27" (1/3) ... [2021-12-27 21:31:28,108 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2df9972e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.12 09:31:28, skipping insertion in model container [2021-12-27 21:31:28,108 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 09:31:27" (2/3) ... [2021-12-27 21:31:28,108 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2df9972e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.12 09:31:28, skipping insertion in model container [2021-12-27 21:31:28,108 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.12 09:31:28" (3/3) ... [2021-12-27 21:31:28,109 INFO L111 eAbstractionObserver]: Analyzing ICFG pnr4.c [2021-12-27 21:31:28,113 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-27 21:31:28,113 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-27 21:31:28,188 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-27 21:31:28,194 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 [2021-12-27 21:31:28,194 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-27 21:31:28,211 INFO L276 IsEmpty]: Start isEmpty. Operand has 34 states, 27 states have (on average 1.4814814814814814) internal successors, (40), 28 states have internal predecessors, (40), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-27 21:31:28,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-27 21:31:28,214 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:31:28,215 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:31:28,216 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:31:28,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:31:28,223 INFO L85 PathProgramCache]: Analyzing trace with hash -1807585031, now seen corresponding path program 1 times [2021-12-27 21:31:28,230 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:31:28,231 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1410400944] [2021-12-27 21:31:28,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:31:28,233 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:31:28,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:28,577 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 21:31:28,578 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:31:28,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1410400944] [2021-12-27 21:31:28,579 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1410400944] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-27 21:31:28,579 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-27 21:31:28,580 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-27 21:31:28,581 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165530309] [2021-12-27 21:31:28,582 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-27 21:31:28,590 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-27 21:31:28,590 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:31:28,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-27 21:31:28,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-12-27 21:31:28,622 INFO L87 Difference]: Start difference. First operand has 34 states, 27 states have (on average 1.4814814814814814) internal successors, (40), 28 states have internal predecessors, (40), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:31:28,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:31:28,777 INFO L93 Difference]: Finished difference Result 84 states and 117 transitions. [2021-12-27 21:31:28,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-27 21:31:28,780 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-12-27 21:31:28,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:31:28,785 INFO L225 Difference]: With dead ends: 84 [2021-12-27 21:31:28,785 INFO L226 Difference]: Without dead ends: 44 [2021-12-27 21:31:28,787 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-12-27 21:31:28,791 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 72 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-27 21:31:28,792 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 52 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-27 21:31:28,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-12-27 21:31:28,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 31. [2021-12-27 21:31:28,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 25 states have (on average 1.24) internal successors, (31), 25 states have internal predecessors, (31), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-27 21:31:28,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 39 transitions. [2021-12-27 21:31:28,827 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 39 transitions. Word has length 11 [2021-12-27 21:31:28,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:31:28,828 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 39 transitions. [2021-12-27 21:31:28,828 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:31:28,828 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 39 transitions. [2021-12-27 21:31:28,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-12-27 21:31:28,830 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:31:28,830 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 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] [2021-12-27 21:31:28,830 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-27 21:31:28,830 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:31:28,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:31:28,831 INFO L85 PathProgramCache]: Analyzing trace with hash -1998588124, now seen corresponding path program 1 times [2021-12-27 21:31:28,831 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:31:28,832 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1635619601] [2021-12-27 21:31:28,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:31:28,832 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:31:28,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:29,098 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-27 21:31:29,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:29,105 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-27 21:31:29,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:29,111 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-12-27 21:31:29,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:29,117 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-12-27 21:31:29,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:29,123 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 21:31:29,123 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:31:29,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1635619601] [2021-12-27 21:31:29,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1635619601] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:31:29,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [699761922] [2021-12-27 21:31:29,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:31:29,124 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:31:29,124 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:31:29,126 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) [2021-12-27 21:31:29,168 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-27 21:31:29,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:29,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-27 21:31:29,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:31:29,360 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-27 21:31:29,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:31:29,423 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 30 treesize of output 29 [2021-12-27 21:31:29,479 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:31:29,481 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 30 treesize of output 29 [2021-12-27 21:31:29,532 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:31:29,533 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 42 treesize of output 41 [2021-12-27 21:31:29,607 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 21:31:29,607 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:31:29,760 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 13 [2021-12-27 21:31:29,766 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 24 treesize of output 22 [2021-12-27 21:31:29,798 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 21:31:29,798 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [699761922] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:31:29,798 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:31:29,799 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 6] total 13 [2021-12-27 21:31:29,800 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2008864568] [2021-12-27 21:31:29,800 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:31:29,801 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-27 21:31:29,802 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:31:29,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-27 21:31:29,808 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2021-12-27 21:31:29,808 INFO L87 Difference]: Start difference. First operand 31 states and 39 transitions. Second operand has 13 states, 13 states have (on average 3.4615384615384617) internal successors, (45), 13 states have internal predecessors, (45), 4 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-12-27 21:31:30,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:31:30,193 INFO L93 Difference]: Finished difference Result 102 states and 141 transitions. [2021-12-27 21:31:30,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-12-27 21:31:30,194 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.4615384615384617) internal successors, (45), 13 states have internal predecessors, (45), 4 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 37 [2021-12-27 21:31:30,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:31:30,195 INFO L225 Difference]: With dead ends: 102 [2021-12-27 21:31:30,196 INFO L226 Difference]: Without dead ends: 100 [2021-12-27 21:31:30,196 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 74 SyntacticMatches, 6 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=105, Invalid=275, Unknown=0, NotChecked=0, Total=380 [2021-12-27 21:31:30,197 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 96 mSDsluCounter, 254 mSDsCounter, 0 mSdLazyCounter, 349 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 313 SdHoareTripleChecker+Invalid, 420 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-27 21:31:30,198 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 313 Invalid, 420 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 349 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-27 21:31:30,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-12-27 21:31:30,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 48. [2021-12-27 21:31:30,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 38 states have (on average 1.2894736842105263) internal successors, (49), 38 states have internal predecessors, (49), 8 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-27 21:31:30,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 65 transitions. [2021-12-27 21:31:30,228 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 65 transitions. Word has length 37 [2021-12-27 21:31:30,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:31:30,229 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 65 transitions. [2021-12-27 21:31:30,229 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 3.4615384615384617) internal successors, (45), 13 states have internal predecessors, (45), 4 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-12-27 21:31:30,229 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 65 transitions. [2021-12-27 21:31:30,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-12-27 21:31:30,232 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:31:30,232 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 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] [2021-12-27 21:31:30,255 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-12-27 21:31:30,455 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:31:30,455 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:31:30,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:31:30,456 INFO L85 PathProgramCache]: Analyzing trace with hash -1858039514, now seen corresponding path program 1 times [2021-12-27 21:31:30,456 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:31:30,456 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [837847725] [2021-12-27 21:31:30,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:31:30,456 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:31:30,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:30,683 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-27 21:31:30,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:30,689 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-27 21:31:30,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:30,694 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-12-27 21:31:30,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:30,698 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-12-27 21:31:30,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:30,702 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 21:31:30,702 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:31:30,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [837847725] [2021-12-27 21:31:30,703 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [837847725] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:31:30,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [683195342] [2021-12-27 21:31:30,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:31:30,703 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:31:30,704 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:31:30,705 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) [2021-12-27 21:31:30,743 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-27 21:31:30,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:30,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 21 conjunts are in the unsatisfiable core [2021-12-27 21:31:30,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:31:30,892 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-27 21:31:30,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:31:30,985 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 29 treesize of output 28 [2021-12-27 21:31:31,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:31:31,062 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 29 treesize of output 28 [2021-12-27 21:31:31,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:31:31,128 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 21 treesize of output 20 [2021-12-27 21:31:31,206 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 7 [2021-12-27 21:31:31,248 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-27 21:31:31,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:31:32,304 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 13 [2021-12-27 21:31:32,307 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 28 treesize of output 26 [2021-12-27 21:31:32,372 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 21:31:32,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [683195342] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:31:32,372 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:31:32,372 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 7] total 19 [2021-12-27 21:31:32,373 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498597497] [2021-12-27 21:31:32,373 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:31:32,373 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-12-27 21:31:32,374 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:31:32,374 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-12-27 21:31:32,374 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=285, Unknown=0, NotChecked=0, Total=342 [2021-12-27 21:31:32,375 INFO L87 Difference]: Start difference. First operand 48 states and 65 transitions. Second operand has 19 states, 19 states have (on average 3.1578947368421053) internal successors, (60), 19 states have internal predecessors, (60), 6 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 6 states have call predecessors, (12), 6 states have call successors, (12) [2021-12-27 21:31:33,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:31:33,312 INFO L93 Difference]: Finished difference Result 172 states and 236 transitions. [2021-12-27 21:31:33,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-12-27 21:31:33,312 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.1578947368421053) internal successors, (60), 19 states have internal predecessors, (60), 6 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 6 states have call predecessors, (12), 6 states have call successors, (12) Word has length 37 [2021-12-27 21:31:33,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:31:33,315 INFO L225 Difference]: With dead ends: 172 [2021-12-27 21:31:33,315 INFO L226 Difference]: Without dead ends: 170 [2021-12-27 21:31:33,316 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 65 SyntacticMatches, 10 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 535 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=334, Invalid=1558, Unknown=0, NotChecked=0, Total=1892 [2021-12-27 21:31:33,317 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 187 mSDsluCounter, 423 mSDsCounter, 0 mSdLazyCounter, 545 mSolverCounterSat, 186 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 191 SdHoareTripleChecker+Valid, 501 SdHoareTripleChecker+Invalid, 818 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 186 IncrementalHoareTripleChecker+Valid, 545 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 87 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-27 21:31:33,317 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [191 Valid, 501 Invalid, 818 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [186 Valid, 545 Invalid, 0 Unknown, 87 Unchecked, 0.4s Time] [2021-12-27 21:31:33,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-12-27 21:31:33,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 75. [2021-12-27 21:31:33,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 56 states have (on average 1.3392857142857142) internal successors, (75), 57 states have internal predecessors, (75), 16 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2021-12-27 21:31:33,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 107 transitions. [2021-12-27 21:31:33,334 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 107 transitions. Word has length 37 [2021-12-27 21:31:33,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:31:33,334 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 107 transitions. [2021-12-27 21:31:33,335 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 3.1578947368421053) internal successors, (60), 19 states have internal predecessors, (60), 6 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 6 states have call predecessors, (12), 6 states have call successors, (12) [2021-12-27 21:31:33,335 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 107 transitions. [2021-12-27 21:31:33,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-12-27 21:31:33,336 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:31:33,336 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 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] [2021-12-27 21:31:33,360 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-27 21:31:33,552 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,SelfDestructingSolverStorable2 [2021-12-27 21:31:33,553 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:31:33,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:31:33,553 INFO L85 PathProgramCache]: Analyzing trace with hash -1526874982, now seen corresponding path program 1 times [2021-12-27 21:31:33,553 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:31:33,553 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [76004108] [2021-12-27 21:31:33,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:31:33,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:31:33,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:33,692 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-27 21:31:33,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:33,696 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-27 21:31:33,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:33,699 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-12-27 21:31:33,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:33,703 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-12-27 21:31:33,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:33,707 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 21:31:33,707 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:31:33,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [76004108] [2021-12-27 21:31:33,708 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [76004108] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:31:33,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1759234773] [2021-12-27 21:31:33,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:31:33,708 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:31:33,708 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:31:33,709 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) [2021-12-27 21:31:33,712 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-27 21:31:33,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:33,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-27 21:31:33,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:31:33,833 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-27 21:31:33,864 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:31:33,865 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 30 treesize of output 29 [2021-12-27 21:31:33,909 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:31:33,910 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 24 treesize of output 23 [2021-12-27 21:31:33,969 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 21:31:33,969 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:31:34,075 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 17 treesize of output 15 [2021-12-27 21:31:34,082 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 [2021-12-27 21:31:34,118 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 21:31:34,119 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1759234773] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:31:34,119 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:31:34,119 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 7] total 13 [2021-12-27 21:31:34,119 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510305203] [2021-12-27 21:31:34,119 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:31:34,120 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-27 21:31:34,120 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:31:34,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-27 21:31:34,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-12-27 21:31:34,121 INFO L87 Difference]: Start difference. First operand 75 states and 107 transitions. Second operand has 13 states, 13 states have (on average 4.0) internal successors, (52), 13 states have internal predecessors, (52), 4 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-12-27 21:31:34,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:31:34,545 INFO L93 Difference]: Finished difference Result 262 states and 392 transitions. [2021-12-27 21:31:34,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-27 21:31:34,546 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 4.0) internal successors, (52), 13 states have internal predecessors, (52), 4 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 41 [2021-12-27 21:31:34,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:31:34,547 INFO L225 Difference]: With dead ends: 262 [2021-12-27 21:31:34,548 INFO L226 Difference]: Without dead ends: 260 [2021-12-27 21:31:34,548 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 81 SyntacticMatches, 7 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=131, Invalid=375, Unknown=0, NotChecked=0, Total=506 [2021-12-27 21:31:34,549 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 95 mSDsluCounter, 295 mSDsCounter, 0 mSdLazyCounter, 431 mSolverCounterSat, 98 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 362 SdHoareTripleChecker+Invalid, 529 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 98 IncrementalHoareTripleChecker+Valid, 431 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-27 21:31:34,549 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 362 Invalid, 529 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [98 Valid, 431 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-27 21:31:34,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-12-27 21:31:34,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 125. [2021-12-27 21:31:34,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 94 states have (on average 1.372340425531915) internal successors, (129), 95 states have internal predecessors, (129), 28 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) [2021-12-27 21:31:34,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 185 transitions. [2021-12-27 21:31:34,573 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 185 transitions. Word has length 41 [2021-12-27 21:31:34,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:31:34,573 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 185 transitions. [2021-12-27 21:31:34,574 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 4.0) internal successors, (52), 13 states have internal predecessors, (52), 4 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-12-27 21:31:34,574 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 185 transitions. [2021-12-27 21:31:34,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-12-27 21:31:34,575 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:31:34,576 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 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] [2021-12-27 21:31:34,599 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-27 21:31:34,791 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:31:34,792 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:31:34,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:31:34,792 INFO L85 PathProgramCache]: Analyzing trace with hash 962653980, now seen corresponding path program 1 times [2021-12-27 21:31:34,792 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:31:34,792 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2108238581] [2021-12-27 21:31:34,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:31:34,793 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:31:34,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:34,946 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-27 21:31:34,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:34,950 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-27 21:31:34,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:34,953 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-12-27 21:31:34,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:34,956 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-12-27 21:31:34,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:34,960 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 21:31:34,960 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:31:34,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2108238581] [2021-12-27 21:31:34,960 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2108238581] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:31:34,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [913103774] [2021-12-27 21:31:34,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:31:34,961 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:31:34,961 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:31:34,962 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) [2021-12-27 21:31:34,963 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-27 21:31:35,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:35,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 21 conjunts are in the unsatisfiable core [2021-12-27 21:31:35,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:31:35,140 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-27 21:31:35,227 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:31:35,228 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 29 treesize of output 28 [2021-12-27 21:31:35,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:31:35,298 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 23 treesize of output 22 [2021-12-27 21:31:35,424 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 7 [2021-12-27 21:31:35,447 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-27 21:31:35,447 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:31:35,981 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 17 treesize of output 15 [2021-12-27 21:31:35,984 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 34 treesize of output 30 [2021-12-27 21:31:36,067 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 21:31:36,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [913103774] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:31:36,067 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:31:36,067 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8] total 21 [2021-12-27 21:31:36,068 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607649241] [2021-12-27 21:31:36,068 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:31:36,068 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-12-27 21:31:36,068 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:31:36,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-12-27 21:31:36,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=355, Unknown=0, NotChecked=0, Total=420 [2021-12-27 21:31:36,069 INFO L87 Difference]: Start difference. First operand 125 states and 185 transitions. Second operand has 21 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 21 states have internal predecessors, (72), 6 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 6 states have call predecessors, (12), 6 states have call successors, (12) [2021-12-27 21:31:37,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:31:37,063 INFO L93 Difference]: Finished difference Result 387 states and 569 transitions. [2021-12-27 21:31:37,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-12-27 21:31:37,065 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 21 states have internal predecessors, (72), 6 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 6 states have call predecessors, (12), 6 states have call successors, (12) Word has length 41 [2021-12-27 21:31:37,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:31:37,067 INFO L225 Difference]: With dead ends: 387 [2021-12-27 21:31:37,067 INFO L226 Difference]: Without dead ends: 385 [2021-12-27 21:31:37,068 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 73 SyntacticMatches, 7 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 558 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=358, Invalid=1712, Unknown=0, NotChecked=0, Total=2070 [2021-12-27 21:31:37,069 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 242 mSDsluCounter, 483 mSDsCounter, 0 mSdLazyCounter, 686 mSolverCounterSat, 273 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 246 SdHoareTripleChecker+Valid, 562 SdHoareTripleChecker+Invalid, 1051 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 273 IncrementalHoareTripleChecker+Valid, 686 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 92 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-27 21:31:37,070 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [246 Valid, 562 Invalid, 1051 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [273 Valid, 686 Invalid, 0 Unknown, 92 Unchecked, 0.5s Time] [2021-12-27 21:31:37,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2021-12-27 21:31:37,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 181. [2021-12-27 21:31:37,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 132 states have (on average 1.4015151515151516) internal successors, (185), 135 states have internal predecessors, (185), 45 states have call successors, (45), 3 states have call predecessors, (45), 3 states have return successors, (45), 42 states have call predecessors, (45), 45 states have call successors, (45) [2021-12-27 21:31:37,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 275 transitions. [2021-12-27 21:31:37,113 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 275 transitions. Word has length 41 [2021-12-27 21:31:37,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:31:37,114 INFO L470 AbstractCegarLoop]: Abstraction has 181 states and 275 transitions. [2021-12-27 21:31:37,114 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 21 states have internal predecessors, (72), 6 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 6 states have call predecessors, (12), 6 states have call successors, (12) [2021-12-27 21:31:37,114 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 275 transitions. [2021-12-27 21:31:37,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-27 21:31:37,121 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:31:37,121 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:31:37,150 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-27 21:31:37,335 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:31:37,335 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:31:37,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:31:37,336 INFO L85 PathProgramCache]: Analyzing trace with hash 1227872016, now seen corresponding path program 2 times [2021-12-27 21:31:37,336 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:31:37,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [734530619] [2021-12-27 21:31:37,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:31:37,336 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:31:37,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:37,440 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-27 21:31:37,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:37,447 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-27 21:31:37,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:37,450 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-12-27 21:31:37,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:37,452 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-12-27 21:31:37,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:37,456 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 21:31:37,456 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:31:37,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [734530619] [2021-12-27 21:31:37,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [734530619] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:31:37,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [576446774] [2021-12-27 21:31:37,456 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-27 21:31:37,457 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:31:37,457 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:31:37,458 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) [2021-12-27 21:31:37,482 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-27 21:31:37,522 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-27 21:31:37,522 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 21:31:37,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 26 conjunts are in the unsatisfiable core [2021-12-27 21:31:37,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:31:37,576 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-27 21:31:37,613 INFO L353 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-12-27 21:31:37,613 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 24 treesize of output 23 [2021-12-27 21:31:37,690 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 21:31:37,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:31:37,771 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 17 treesize of output 15 [2021-12-27 21:31:37,773 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 30 treesize of output 26 [2021-12-27 21:31:37,834 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 21:31:37,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [576446774] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:31:37,834 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:31:37,834 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 12 [2021-12-27 21:31:37,834 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226234463] [2021-12-27 21:31:37,834 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:31:37,835 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-27 21:31:37,835 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:31:37,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-27 21:31:37,835 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-12-27 21:31:37,836 INFO L87 Difference]: Start difference. First operand 181 states and 275 transitions. Second operand has 12 states, 12 states have (on average 4.083333333333333) internal successors, (49), 12 states have internal predecessors, (49), 3 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-12-27 21:31:38,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:31:38,440 INFO L93 Difference]: Finished difference Result 1228 states and 1937 transitions. [2021-12-27 21:31:38,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-12-27 21:31:38,441 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.083333333333333) internal successors, (49), 12 states have internal predecessors, (49), 3 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 45 [2021-12-27 21:31:38,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:31:38,447 INFO L225 Difference]: With dead ends: 1228 [2021-12-27 21:31:38,447 INFO L226 Difference]: Without dead ends: 1226 [2021-12-27 21:31:38,448 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 87 SyntacticMatches, 9 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2021-12-27 21:31:38,449 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 103 mSDsluCounter, 287 mSDsCounter, 0 mSdLazyCounter, 520 mSolverCounterSat, 186 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 384 SdHoareTripleChecker+Invalid, 706 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 186 IncrementalHoareTripleChecker+Valid, 520 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-27 21:31:38,449 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [119 Valid, 384 Invalid, 706 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [186 Valid, 520 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-27 21:31:38,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1226 states. [2021-12-27 21:31:38,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1226 to 402. [2021-12-27 21:31:38,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 402 states, 294 states have (on average 1.435374149659864) internal successors, (422), 296 states have internal predecessors, (422), 104 states have call successors, (104), 3 states have call predecessors, (104), 3 states have return successors, (104), 102 states have call predecessors, (104), 104 states have call successors, (104) [2021-12-27 21:31:38,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 630 transitions. [2021-12-27 21:31:38,519 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 630 transitions. Word has length 45 [2021-12-27 21:31:38,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:31:38,519 INFO L470 AbstractCegarLoop]: Abstraction has 402 states and 630 transitions. [2021-12-27 21:31:38,520 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 4.083333333333333) internal successors, (49), 12 states have internal predecessors, (49), 3 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-12-27 21:31:38,520 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 630 transitions. [2021-12-27 21:31:38,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-27 21:31:38,521 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:31:38,522 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:31:38,541 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-27 21:31:38,733 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:31:38,733 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:31:38,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:31:38,733 INFO L85 PathProgramCache]: Analyzing trace with hash 1650573842, now seen corresponding path program 1 times [2021-12-27 21:31:38,733 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:31:38,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1955232657] [2021-12-27 21:31:38,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:31:38,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:31:38,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:38,861 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-27 21:31:38,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:38,865 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-27 21:31:38,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:38,868 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-12-27 21:31:38,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:38,871 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-12-27 21:31:38,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:38,874 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 21:31:38,874 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:31:38,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1955232657] [2021-12-27 21:31:38,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1955232657] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:31:38,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1089583999] [2021-12-27 21:31:38,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:31:38,875 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:31:38,875 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:31:38,876 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) [2021-12-27 21:31:38,903 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-27 21:31:38,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:38,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 19 conjunts are in the unsatisfiable core [2021-12-27 21:31:38,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:31:39,077 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-27 21:31:39,142 INFO L353 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-12-27 21:31:39,143 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 22 [2021-12-27 21:31:39,265 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 [2021-12-27 21:31:39,287 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 9 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-27 21:31:39,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:31:39,413 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 17 treesize of output 15 [2021-12-27 21:31:39,415 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 34 treesize of output 30 [2021-12-27 21:31:39,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1089583999] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:31:39,458 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-27 21:31:39,458 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 18 [2021-12-27 21:31:39,458 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475545178] [2021-12-27 21:31:39,459 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-27 21:31:39,459 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-27 21:31:39,459 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:31:39,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-27 21:31:39,460 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=427, Unknown=0, NotChecked=0, Total=506 [2021-12-27 21:31:39,460 INFO L87 Difference]: Start difference. First operand 402 states and 630 transitions. Second operand has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 18 states have internal predecessors, (59), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-12-27 21:31:40,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:31:40,083 INFO L93 Difference]: Finished difference Result 714 states and 1094 transitions. [2021-12-27 21:31:40,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-12-27 21:31:40,084 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 18 states have internal predecessors, (59), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 45 [2021-12-27 21:31:40,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:31:40,087 INFO L225 Difference]: With dead ends: 714 [2021-12-27 21:31:40,087 INFO L226 Difference]: Without dead ends: 712 [2021-12-27 21:31:40,089 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 65 SyntacticMatches, 4 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 493 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=259, Invalid=1463, Unknown=0, NotChecked=0, Total=1722 [2021-12-27 21:31:40,089 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 95 mSDsluCounter, 441 mSDsCounter, 0 mSdLazyCounter, 596 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 506 SdHoareTripleChecker+Invalid, 741 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 596 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 70 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-27 21:31:40,089 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [102 Valid, 506 Invalid, 741 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 596 Invalid, 0 Unknown, 70 Unchecked, 0.3s Time] [2021-12-27 21:31:40,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 712 states. [2021-12-27 21:31:40,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 712 to 426. [2021-12-27 21:31:40,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 426 states, 314 states have (on average 1.4331210191082802) internal successors, (450), 314 states have internal predecessors, (450), 106 states have call successors, (106), 5 states have call predecessors, (106), 5 states have return successors, (106), 106 states have call predecessors, (106), 106 states have call successors, (106) [2021-12-27 21:31:40,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 426 states to 426 states and 662 transitions. [2021-12-27 21:31:40,154 INFO L78 Accepts]: Start accepts. Automaton has 426 states and 662 transitions. Word has length 45 [2021-12-27 21:31:40,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:31:40,155 INFO L470 AbstractCegarLoop]: Abstraction has 426 states and 662 transitions. [2021-12-27 21:31:40,155 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 18 states have internal predecessors, (59), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-12-27 21:31:40,155 INFO L276 IsEmpty]: Start isEmpty. Operand 426 states and 662 transitions. [2021-12-27 21:31:40,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-12-27 21:31:40,157 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:31:40,157 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 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] [2021-12-27 21:31:40,185 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-27 21:31:40,379 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:31:40,380 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:31:40,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:31:40,380 INFO L85 PathProgramCache]: Analyzing trace with hash -112998778, now seen corresponding path program 3 times [2021-12-27 21:31:40,380 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:31:40,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [176596026] [2021-12-27 21:31:40,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:31:40,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:31:40,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:40,527 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-27 21:31:40,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:40,531 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-27 21:31:40,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:40,533 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-12-27 21:31:40,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:40,536 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-12-27 21:31:40,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:40,539 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 21:31:40,539 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:31:40,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [176596026] [2021-12-27 21:31:40,539 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [176596026] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:31:40,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1636996406] [2021-12-27 21:31:40,539 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-27 21:31:40,540 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:31:40,540 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:31:40,541 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) [2021-12-27 21:31:40,542 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-27 21:31:40,605 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-12-27 21:31:40,605 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 21:31:40,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 26 conjunts are in the unsatisfiable core [2021-12-27 21:31:40,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:31:40,671 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-27 21:31:40,781 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 21:31:40,781 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:31:40,853 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 17 treesize of output 15 [2021-12-27 21:31:40,858 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 [2021-12-27 21:31:40,911 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 21:31:40,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1636996406] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:31:40,911 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:31:40,911 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 21 [2021-12-27 21:31:40,912 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864567045] [2021-12-27 21:31:40,912 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:31:40,912 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-12-27 21:31:40,912 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:31:40,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-12-27 21:31:40,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=345, Unknown=0, NotChecked=0, Total=420 [2021-12-27 21:31:40,913 INFO L87 Difference]: Start difference. First operand 426 states and 662 transitions. Second operand has 21 states, 21 states have (on average 3.761904761904762) internal successors, (79), 21 states have internal predecessors, (79), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-12-27 21:31:42,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:31:42,487 INFO L93 Difference]: Finished difference Result 2721 states and 4299 transitions. [2021-12-27 21:31:42,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-12-27 21:31:42,488 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.761904761904762) internal successors, (79), 21 states have internal predecessors, (79), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 49 [2021-12-27 21:31:42,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:31:42,499 INFO L225 Difference]: With dead ends: 2721 [2021-12-27 21:31:42,499 INFO L226 Difference]: Without dead ends: 2719 [2021-12-27 21:31:42,502 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 93 SyntacticMatches, 3 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 922 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=522, Invalid=2558, Unknown=0, NotChecked=0, Total=3080 [2021-12-27 21:31:42,503 INFO L933 BasicCegarLoop]: 169 mSDtfsCounter, 227 mSDsluCounter, 755 mSDsCounter, 0 mSdLazyCounter, 1588 mSolverCounterSat, 403 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 243 SdHoareTripleChecker+Valid, 924 SdHoareTripleChecker+Invalid, 1991 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 403 IncrementalHoareTripleChecker+Valid, 1588 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-12-27 21:31:42,503 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [243 Valid, 924 Invalid, 1991 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [403 Valid, 1588 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-12-27 21:31:42,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2719 states. [2021-12-27 21:31:42,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2719 to 1146. [2021-12-27 21:31:42,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1146 states, 834 states have (on average 1.460431654676259) internal successors, (1218), 834 states have internal predecessors, (1218), 306 states have call successors, (306), 5 states have call predecessors, (306), 5 states have return successors, (306), 306 states have call predecessors, (306), 306 states have call successors, (306) [2021-12-27 21:31:42,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1146 states to 1146 states and 1830 transitions. [2021-12-27 21:31:42,666 INFO L78 Accepts]: Start accepts. Automaton has 1146 states and 1830 transitions. Word has length 49 [2021-12-27 21:31:42,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:31:42,666 INFO L470 AbstractCegarLoop]: Abstraction has 1146 states and 1830 transitions. [2021-12-27 21:31:42,667 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 3.761904761904762) internal successors, (79), 21 states have internal predecessors, (79), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-12-27 21:31:42,667 INFO L276 IsEmpty]: Start isEmpty. Operand 1146 states and 1830 transitions. [2021-12-27 21:31:42,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-12-27 21:31:42,669 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:31:42,669 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 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] [2021-12-27 21:31:42,687 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-12-27 21:31:42,876 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:31:42,876 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:31:42,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:31:42,877 INFO L85 PathProgramCache]: Analyzing trace with hash -1801942520, now seen corresponding path program 1 times [2021-12-27 21:31:42,877 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:31:42,877 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [754620941] [2021-12-27 21:31:42,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:31:42,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:31:42,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:43,046 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-27 21:31:43,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:43,054 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-27 21:31:43,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:43,058 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-12-27 21:31:43,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:43,061 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-12-27 21:31:43,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:43,064 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 21:31:43,064 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:31:43,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [754620941] [2021-12-27 21:31:43,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [754620941] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:31:43,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1622268016] [2021-12-27 21:31:43,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:31:43,065 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:31:43,066 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:31:43,066 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) [2021-12-27 21:31:43,097 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-27 21:31:43,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:43,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 19 conjunts are in the unsatisfiable core [2021-12-27 21:31:43,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:31:43,269 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-27 21:31:43,435 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 [2021-12-27 21:31:43,457 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 21:31:43,457 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:31:43,566 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 17 treesize of output 15 [2021-12-27 21:31:43,568 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 34 treesize of output 30 [2021-12-27 21:31:43,608 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1622268016] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:31:43,608 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-27 21:31:43,608 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 18 [2021-12-27 21:31:43,610 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421192699] [2021-12-27 21:31:43,610 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-27 21:31:43,610 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-27 21:31:43,610 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:31:43,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-27 21:31:43,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=482, Unknown=0, NotChecked=0, Total=552 [2021-12-27 21:31:43,611 INFO L87 Difference]: Start difference. First operand 1146 states and 1830 transitions. Second operand has 18 states, 18 states have (on average 3.611111111111111) internal successors, (65), 18 states have internal predecessors, (65), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-12-27 21:31:44,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:31:44,790 INFO L93 Difference]: Finished difference Result 1937 states and 3028 transitions. [2021-12-27 21:31:44,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-12-27 21:31:44,790 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.611111111111111) internal successors, (65), 18 states have internal predecessors, (65), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 49 [2021-12-27 21:31:44,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:31:44,799 INFO L225 Difference]: With dead ends: 1937 [2021-12-27 21:31:44,799 INFO L226 Difference]: Without dead ends: 1935 [2021-12-27 21:31:44,801 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 64 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 518 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=364, Invalid=1892, Unknown=0, NotChecked=0, Total=2256 [2021-12-27 21:31:44,803 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 251 mSDsluCounter, 472 mSDsCounter, 0 mSdLazyCounter, 803 mSolverCounterSat, 340 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 251 SdHoareTripleChecker+Valid, 569 SdHoareTripleChecker+Invalid, 1143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 340 IncrementalHoareTripleChecker+Valid, 803 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-27 21:31:44,803 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [251 Valid, 569 Invalid, 1143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [340 Valid, 803 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-27 21:31:44,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1935 states. [2021-12-27 21:31:44,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1935 to 450. [2021-12-27 21:31:44,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 450 states, 338 states have (on average 1.4142011834319526) internal successors, (478), 338 states have internal predecessors, (478), 106 states have call successors, (106), 5 states have call predecessors, (106), 5 states have return successors, (106), 106 states have call predecessors, (106), 106 states have call successors, (106) [2021-12-27 21:31:44,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 450 states to 450 states and 690 transitions. [2021-12-27 21:31:44,902 INFO L78 Accepts]: Start accepts. Automaton has 450 states and 690 transitions. Word has length 49 [2021-12-27 21:31:44,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:31:44,903 INFO L470 AbstractCegarLoop]: Abstraction has 450 states and 690 transitions. [2021-12-27 21:31:44,903 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.611111111111111) internal successors, (65), 18 states have internal predecessors, (65), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-12-27 21:31:44,903 INFO L276 IsEmpty]: Start isEmpty. Operand 450 states and 690 transitions. [2021-12-27 21:31:44,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-12-27 21:31:44,905 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:31:44,906 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 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] [2021-12-27 21:31:44,930 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-12-27 21:31:45,119 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-12-27 21:31:45,120 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:31:45,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:31:45,120 INFO L85 PathProgramCache]: Analyzing trace with hash -1773729028, now seen corresponding path program 4 times [2021-12-27 21:31:45,120 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:31:45,120 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1719092287] [2021-12-27 21:31:45,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:31:45,120 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:31:45,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:45,362 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-27 21:31:45,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:45,376 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-27 21:31:45,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:45,379 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-12-27 21:31:45,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:45,381 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-12-27 21:31:45,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:45,388 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 19 proven. 14 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 21:31:45,388 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:31:45,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1719092287] [2021-12-27 21:31:45,388 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1719092287] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:31:45,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1315409213] [2021-12-27 21:31:45,388 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-27 21:31:45,389 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:31:45,389 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:31:45,390 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-27 21:31:45,391 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-27 21:31:45,439 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-27 21:31:45,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 21:31:45,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-27 21:31:45,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:31:45,909 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 32 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 21:31:45,909 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:31:46,133 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 32 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 21:31:46,133 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1315409213] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:31:46,133 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:31:46,133 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 11] total 30 [2021-12-27 21:31:46,133 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683680517] [2021-12-27 21:31:46,133 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:31:46,134 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-12-27 21:31:46,134 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:31:46,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-12-27 21:31:46,135 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=644, Unknown=0, NotChecked=0, Total=870 [2021-12-27 21:31:46,135 INFO L87 Difference]: Start difference. First operand 450 states and 690 transitions. Second operand has 30 states, 30 states have (on average 3.533333333333333) internal successors, (106), 30 states have internal predecessors, (106), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-12-27 21:31:46,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:31:46,500 INFO L93 Difference]: Finished difference Result 607 states and 919 transitions. [2021-12-27 21:31:46,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-12-27 21:31:46,500 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 3.533333333333333) internal successors, (106), 30 states have internal predecessors, (106), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 53 [2021-12-27 21:31:46,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:31:46,503 INFO L225 Difference]: With dead ends: 607 [2021-12-27 21:31:46,503 INFO L226 Difference]: Without dead ends: 583 [2021-12-27 21:31:46,504 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 95 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=316, Invalid=874, Unknown=0, NotChecked=0, Total=1190 [2021-12-27 21:31:46,505 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 201 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 281 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 205 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 352 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 281 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-27 21:31:46,506 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [205 Valid, 133 Invalid, 352 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 281 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-27 21:31:46,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 583 states. [2021-12-27 21:31:46,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 583 to 450. [2021-12-27 21:31:46,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 450 states, 338 states have (on average 1.3905325443786982) internal successors, (470), 338 states have internal predecessors, (470), 106 states have call successors, (106), 5 states have call predecessors, (106), 5 states have return successors, (106), 106 states have call predecessors, (106), 106 states have call successors, (106) [2021-12-27 21:31:46,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 450 states to 450 states and 682 transitions. [2021-12-27 21:31:46,592 INFO L78 Accepts]: Start accepts. Automaton has 450 states and 682 transitions. Word has length 53 [2021-12-27 21:31:46,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:31:46,592 INFO L470 AbstractCegarLoop]: Abstraction has 450 states and 682 transitions. [2021-12-27 21:31:46,592 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 3.533333333333333) internal successors, (106), 30 states have internal predecessors, (106), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-12-27 21:31:46,592 INFO L276 IsEmpty]: Start isEmpty. Operand 450 states and 682 transitions. [2021-12-27 21:31:46,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-12-27 21:31:46,594 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:31:46,594 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:31:46,623 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-12-27 21:31:46,818 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-12-27 21:31:46,818 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:31:46,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:31:46,819 INFO L85 PathProgramCache]: Analyzing trace with hash 1645650707, now seen corresponding path program 2 times [2021-12-27 21:31:46,819 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:31:46,819 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [541958363] [2021-12-27 21:31:46,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:31:46,819 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:31:46,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:47,036 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-27 21:31:47,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:47,041 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-27 21:31:47,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:47,044 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-12-27 21:31:47,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:47,051 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-12-27 21:31:47,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:47,054 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-12-27 21:31:47,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:47,061 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-12-27 21:31:47,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:47,063 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-12-27 21:31:47,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:47,068 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-12-27 21:31:47,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:47,071 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-12-27 21:31:47,071 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:31:47,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [541958363] [2021-12-27 21:31:47,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [541958363] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:31:47,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1383094747] [2021-12-27 21:31:47,072 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-27 21:31:47,072 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:31:47,072 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:31:47,073 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-27 21:31:47,101 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-27 21:31:47,150 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-27 21:31:47,150 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 21:31:47,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 30 conjunts are in the unsatisfiable core [2021-12-27 21:31:47,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:31:47,234 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-27 21:31:47,311 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:31:47,313 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 29 treesize of output 28 [2021-12-27 21:31:47,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:31:47,384 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 29 treesize of output 28 [2021-12-27 21:31:47,462 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:31:47,463 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 29 treesize of output 28 [2021-12-27 21:31:47,569 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:31:47,570 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 24 treesize of output 23 [2021-12-27 21:31:47,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:31:47,626 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 24 treesize of output 23 [2021-12-27 21:31:47,681 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:31:47,682 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 24 treesize of output 23 [2021-12-27 21:31:47,741 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:31:47,742 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 24 treesize of output 23 [2021-12-27 21:31:47,805 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 7 [2021-12-27 21:31:47,831 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 21 proven. 16 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-12-27 21:31:47,832 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:31:49,202 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1383094747] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:31:49,203 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-27 21:31:49,203 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 17 [2021-12-27 21:31:49,203 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1146401966] [2021-12-27 21:31:49,203 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-27 21:31:49,204 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-27 21:31:49,204 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:31:49,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-27 21:31:49,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=317, Unknown=1, NotChecked=0, Total=380 [2021-12-27 21:31:49,204 INFO L87 Difference]: Start difference. First operand 450 states and 682 transitions. Second operand has 17 states, 17 states have (on average 3.7058823529411766) internal successors, (63), 17 states have internal predecessors, (63), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 7 states have call predecessors, (16), 7 states have call successors, (16) [2021-12-27 21:31:50,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:31:50,037 INFO L93 Difference]: Finished difference Result 567 states and 830 transitions. [2021-12-27 21:31:50,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-12-27 21:31:50,038 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.7058823529411766) internal successors, (63), 17 states have internal predecessors, (63), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 7 states have call predecessors, (16), 7 states have call successors, (16) Word has length 63 [2021-12-27 21:31:50,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:31:50,041 INFO L225 Difference]: With dead ends: 567 [2021-12-27 21:31:50,041 INFO L226 Difference]: Without dead ends: 565 [2021-12-27 21:31:50,043 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 88 SyntacticMatches, 17 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 372 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=237, Invalid=1168, Unknown=1, NotChecked=0, Total=1406 [2021-12-27 21:31:50,043 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 114 mSDsluCounter, 482 mSDsCounter, 0 mSdLazyCounter, 762 mSolverCounterSat, 158 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 549 SdHoareTripleChecker+Invalid, 985 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 158 IncrementalHoareTripleChecker+Valid, 762 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 65 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-27 21:31:50,044 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [114 Valid, 549 Invalid, 985 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [158 Valid, 762 Invalid, 0 Unknown, 65 Unchecked, 0.4s Time] [2021-12-27 21:31:50,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 565 states. [2021-12-27 21:31:50,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 565 to 351. [2021-12-27 21:31:50,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 351 states, 264 states have (on average 1.3522727272727273) internal successors, (357), 264 states have internal predecessors, (357), 77 states have call successors, (77), 9 states have call predecessors, (77), 9 states have return successors, (77), 77 states have call predecessors, (77), 77 states have call successors, (77) [2021-12-27 21:31:50,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 511 transitions. [2021-12-27 21:31:50,130 INFO L78 Accepts]: Start accepts. Automaton has 351 states and 511 transitions. Word has length 63 [2021-12-27 21:31:50,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:31:50,130 INFO L470 AbstractCegarLoop]: Abstraction has 351 states and 511 transitions. [2021-12-27 21:31:50,130 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 3.7058823529411766) internal successors, (63), 17 states have internal predecessors, (63), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 7 states have call predecessors, (16), 7 states have call successors, (16) [2021-12-27 21:31:50,130 INFO L276 IsEmpty]: Start isEmpty. Operand 351 states and 511 transitions. [2021-12-27 21:31:50,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-12-27 21:31:50,132 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:31:50,132 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:31:50,155 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-12-27 21:31:50,347 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-12-27 21:31:50,347 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:31:50,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:31:50,348 INFO L85 PathProgramCache]: Analyzing trace with hash 1480379401, now seen corresponding path program 2 times [2021-12-27 21:31:50,348 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:31:50,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1821591568] [2021-12-27 21:31:50,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:31:50,348 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:31:50,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:50,549 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-27 21:31:50,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:50,554 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-27 21:31:50,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:50,558 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-12-27 21:31:50,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:50,560 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-12-27 21:31:50,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:50,563 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-12-27 21:31:50,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:50,565 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-12-27 21:31:50,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:50,568 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-12-27 21:31:50,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:50,570 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-12-27 21:31:50,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:50,573 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-12-27 21:31:50,573 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:31:50,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1821591568] [2021-12-27 21:31:50,573 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1821591568] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:31:50,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [596155454] [2021-12-27 21:31:50,574 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-27 21:31:50,574 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:31:50,574 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:31:50,576 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-27 21:31:50,603 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-27 21:31:50,660 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-27 21:31:50,660 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 21:31:50,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 30 conjunts are in the unsatisfiable core [2021-12-27 21:31:50,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:31:50,763 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-27 21:31:50,826 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:31:50,827 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 29 treesize of output 28 [2021-12-27 21:31:50,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:31:50,885 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 29 treesize of output 28 [2021-12-27 21:31:50,970 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:31:50,970 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 26 treesize of output 25 [2021-12-27 21:31:51,030 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:31:51,031 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 26 treesize of output 25 [2021-12-27 21:31:51,091 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:31:51,091 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 26 treesize of output 25 [2021-12-27 21:31:51,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:31:51,148 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 26 treesize of output 25 [2021-12-27 21:31:51,247 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 7 [2021-12-27 21:31:51,278 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 36 proven. 18 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-12-27 21:31:51,278 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:31:52,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [596155454] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:31:52,313 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-27 21:31:52,313 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 17 [2021-12-27 21:31:52,313 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444280925] [2021-12-27 21:31:52,313 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-27 21:31:52,314 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-27 21:31:52,314 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:31:52,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-27 21:31:52,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=346, Unknown=1, NotChecked=0, Total=420 [2021-12-27 21:31:52,315 INFO L87 Difference]: Start difference. First operand 351 states and 511 transitions. Second operand has 17 states, 17 states have (on average 4.176470588235294) internal successors, (71), 17 states have internal predecessors, (71), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 7 states have call predecessors, (16), 7 states have call successors, (16) [2021-12-27 21:31:52,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:31:52,819 INFO L93 Difference]: Finished difference Result 427 states and 604 transitions. [2021-12-27 21:31:52,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-12-27 21:31:52,820 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 4.176470588235294) internal successors, (71), 17 states have internal predecessors, (71), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 7 states have call predecessors, (16), 7 states have call successors, (16) Word has length 67 [2021-12-27 21:31:52,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:31:52,821 INFO L225 Difference]: With dead ends: 427 [2021-12-27 21:31:52,821 INFO L226 Difference]: Without dead ends: 425 [2021-12-27 21:31:52,822 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 87 SyntacticMatches, 16 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 453 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=242, Invalid=1089, Unknown=1, NotChecked=0, Total=1332 [2021-12-27 21:31:52,823 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 142 mSDsluCounter, 270 mSDsCounter, 0 mSdLazyCounter, 423 mSolverCounterSat, 160 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 335 SdHoareTripleChecker+Invalid, 639 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 160 IncrementalHoareTripleChecker+Valid, 423 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 56 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-27 21:31:52,823 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [142 Valid, 335 Invalid, 639 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [160 Valid, 423 Invalid, 0 Unknown, 56 Unchecked, 0.3s Time] [2021-12-27 21:31:52,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 425 states. [2021-12-27 21:31:52,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 425 to 170. [2021-12-27 21:31:52,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 130 states have (on average 1.2923076923076924) internal successors, (168), 131 states have internal predecessors, (168), 33 states have call successors, (33), 6 states have call predecessors, (33), 6 states have return successors, (33), 32 states have call predecessors, (33), 33 states have call successors, (33) [2021-12-27 21:31:52,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 234 transitions. [2021-12-27 21:31:52,873 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 234 transitions. Word has length 67 [2021-12-27 21:31:52,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:31:52,873 INFO L470 AbstractCegarLoop]: Abstraction has 170 states and 234 transitions. [2021-12-27 21:31:52,874 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 4.176470588235294) internal successors, (71), 17 states have internal predecessors, (71), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 7 states have call predecessors, (16), 7 states have call successors, (16) [2021-12-27 21:31:52,874 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 234 transitions. [2021-12-27 21:31:52,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-12-27 21:31:52,875 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:31:52,875 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:31:52,898 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-12-27 21:31:53,097 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-12-27 21:31:53,097 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:31:53,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:31:53,098 INFO L85 PathProgramCache]: Analyzing trace with hash 2085117693, now seen corresponding path program 1 times [2021-12-27 21:31:53,098 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:31:53,098 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [440650993] [2021-12-27 21:31:53,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:31:53,098 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:31:53,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:53,223 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-27 21:31:53,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:53,226 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-27 21:31:53,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:53,228 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-12-27 21:31:53,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:53,231 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-12-27 21:31:53,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:53,240 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-12-27 21:31:53,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:53,242 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-12-27 21:31:53,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:53,245 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-12-27 21:31:53,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:53,249 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-12-27 21:31:53,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:53,253 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-12-27 21:31:53,253 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:31:53,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [440650993] [2021-12-27 21:31:53,253 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [440650993] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:31:53,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1347831379] [2021-12-27 21:31:53,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:31:53,254 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:31:53,254 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:31:53,255 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-27 21:31:53,283 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-12-27 21:31:53,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:53,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 28 conjunts are in the unsatisfiable core [2021-12-27 21:31:53,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:31:53,453 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-27 21:31:53,532 INFO L353 Elim1Store]: treesize reduction 42, result has 22.2 percent of original size [2021-12-27 21:31:53,533 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 29 treesize of output 28 [2021-12-27 21:31:53,622 INFO L353 Elim1Store]: treesize reduction 33, result has 21.4 percent of original size [2021-12-27 21:31:53,622 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 26 treesize of output 25 [2021-12-27 21:31:53,674 INFO L353 Elim1Store]: treesize reduction 33, result has 21.4 percent of original size [2021-12-27 21:31:53,675 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 26 treesize of output 25 [2021-12-27 21:31:53,739 INFO L353 Elim1Store]: treesize reduction 33, result has 21.4 percent of original size [2021-12-27 21:31:53,739 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 26 treesize of output 25 [2021-12-27 21:31:53,799 INFO L353 Elim1Store]: treesize reduction 33, result has 21.4 percent of original size [2021-12-27 21:31:53,800 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 26 treesize of output 25 [2021-12-27 21:31:53,914 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 [2021-12-27 21:31:53,944 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 45 proven. 24 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-12-27 21:31:53,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:31:56,101 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1347831379] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:31:56,102 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-27 21:31:56,102 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2021-12-27 21:31:56,102 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876902468] [2021-12-27 21:31:56,102 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-27 21:31:56,102 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-27 21:31:56,103 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:31:56,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-27 21:31:56,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=505, Unknown=1, NotChecked=0, Total=600 [2021-12-27 21:31:56,103 INFO L87 Difference]: Start difference. First operand 170 states and 234 transitions. Second operand has 20 states, 20 states have (on average 3.95) internal successors, (79), 20 states have internal predecessors, (79), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 7 states have call predecessors, (16), 7 states have call successors, (16) [2021-12-27 21:31:57,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:31:57,134 INFO L93 Difference]: Finished difference Result 380 states and 532 transitions. [2021-12-27 21:31:57,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-12-27 21:31:57,134 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.95) internal successors, (79), 20 states have internal predecessors, (79), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 7 states have call predecessors, (16), 7 states have call successors, (16) Word has length 71 [2021-12-27 21:31:57,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:31:57,136 INFO L225 Difference]: With dead ends: 380 [2021-12-27 21:31:57,136 INFO L226 Difference]: Without dead ends: 378 [2021-12-27 21:31:57,137 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 90 SyntacticMatches, 12 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 846 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=417, Invalid=2338, Unknown=1, NotChecked=0, Total=2756 [2021-12-27 21:31:57,138 INFO L933 BasicCegarLoop]: 82 mSDtfsCounter, 183 mSDsluCounter, 585 mSDsCounter, 0 mSdLazyCounter, 924 mSolverCounterSat, 236 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 189 SdHoareTripleChecker+Valid, 667 SdHoareTripleChecker+Invalid, 1260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 236 IncrementalHoareTripleChecker+Valid, 924 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 100 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-27 21:31:57,138 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [189 Valid, 667 Invalid, 1260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [236 Valid, 924 Invalid, 0 Unknown, 100 Unchecked, 0.5s Time] [2021-12-27 21:31:57,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2021-12-27 21:31:57,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 232. [2021-12-27 21:31:57,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 174 states have (on average 1.3333333333333333) internal successors, (232), 175 states have internal predecessors, (232), 49 states have call successors, (49), 8 states have call predecessors, (49), 8 states have return successors, (49), 48 states have call predecessors, (49), 49 states have call successors, (49) [2021-12-27 21:31:57,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 330 transitions. [2021-12-27 21:31:57,229 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 330 transitions. Word has length 71 [2021-12-27 21:31:57,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:31:57,229 INFO L470 AbstractCegarLoop]: Abstraction has 232 states and 330 transitions. [2021-12-27 21:31:57,230 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.95) internal successors, (79), 20 states have internal predecessors, (79), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 7 states have call predecessors, (16), 7 states have call successors, (16) [2021-12-27 21:31:57,230 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 330 transitions. [2021-12-27 21:31:57,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-12-27 21:31:57,231 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:31:57,231 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 5, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:31:57,249 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-12-27 21:31:57,440 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-12-27 21:31:57,440 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:31:57,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:31:57,440 INFO L85 PathProgramCache]: Analyzing trace with hash 949660519, now seen corresponding path program 5 times [2021-12-27 21:31:57,440 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:31:57,440 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [257147815] [2021-12-27 21:31:57,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:31:57,441 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:31:57,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:57,563 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-27 21:31:57,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:57,566 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-27 21:31:57,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:57,570 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-12-27 21:31:57,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:57,577 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-12-27 21:31:57,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:57,579 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-12-27 21:31:57,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:57,581 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-12-27 21:31:57,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:57,584 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-12-27 21:31:57,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:57,586 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-12-27 21:31:57,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:31:57,588 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-12-27 21:31:57,589 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:31:57,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [257147815] [2021-12-27 21:31:57,589 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [257147815] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:31:57,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1595066144] [2021-12-27 21:31:57,589 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-27 21:31:57,589 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:31:57,590 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:31:57,591 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-27 21:31:57,607 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-12-27 21:31:57,737 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-12-27 21:31:57,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 21:31:57,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 30 conjunts are in the unsatisfiable core [2021-12-27 21:31:57,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:31:57,806 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-27 21:31:57,838 INFO L353 Elim1Store]: treesize reduction 42, result has 22.2 percent of original size [2021-12-27 21:31:57,839 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 30 treesize of output 29 [2021-12-27 21:31:57,877 INFO L353 Elim1Store]: treesize reduction 42, result has 22.2 percent of original size [2021-12-27 21:31:57,877 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 30 treesize of output 29 [2021-12-27 21:31:57,915 INFO L353 Elim1Store]: treesize reduction 42, result has 22.2 percent of original size [2021-12-27 21:31:57,915 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 30 treesize of output 29 [2021-12-27 21:31:58,057 INFO L353 Elim1Store]: treesize reduction 14, result has 17.6 percent of original size [2021-12-27 21:31:58,058 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 46 treesize of output 24 [2021-12-27 21:31:58,079 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-12-27 21:31:58,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:31:58,213 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 17 treesize of output 15 [2021-12-27 21:31:58,216 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 [2021-12-27 21:31:58,279 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-12-27 21:31:58,279 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1595066144] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:31:58,279 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:31:58,280 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 17 [2021-12-27 21:31:58,280 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369770332] [2021-12-27 21:31:58,280 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:31:58,280 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-27 21:31:58,280 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:31:58,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-27 21:31:58,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-12-27 21:31:58,281 INFO L87 Difference]: Start difference. First operand 232 states and 330 transitions. Second operand has 17 states, 17 states have (on average 4.647058823529412) internal successors, (79), 17 states have internal predecessors, (79), 4 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2021-12-27 21:32:02,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:32:02,107 INFO L93 Difference]: Finished difference Result 3000 states and 4757 transitions. [2021-12-27 21:32:02,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-12-27 21:32:02,107 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 4.647058823529412) internal successors, (79), 17 states have internal predecessors, (79), 4 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) Word has length 79 [2021-12-27 21:32:02,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:32:02,117 INFO L225 Difference]: With dead ends: 3000 [2021-12-27 21:32:02,117 INFO L226 Difference]: Without dead ends: 2998 [2021-12-27 21:32:02,119 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 162 SyntacticMatches, 10 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2825 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=834, Invalid=6822, Unknown=0, NotChecked=0, Total=7656 [2021-12-27 21:32:02,120 INFO L933 BasicCegarLoop]: 310 mSDtfsCounter, 244 mSDsluCounter, 1076 mSDsCounter, 0 mSdLazyCounter, 3282 mSolverCounterSat, 776 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 272 SdHoareTripleChecker+Valid, 1386 SdHoareTripleChecker+Invalid, 4058 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 776 IncrementalHoareTripleChecker+Valid, 3282 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-12-27 21:32:02,120 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [272 Valid, 1386 Invalid, 4058 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [776 Valid, 3282 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-12-27 21:32:02,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2998 states. [2021-12-27 21:32:02,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2998 to 488. [2021-12-27 21:32:02,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 488 states, 362 states have (on average 1.4005524861878453) internal successors, (507), 363 states have internal predecessors, (507), 117 states have call successors, (117), 8 states have call predecessors, (117), 8 states have return successors, (117), 116 states have call predecessors, (117), 117 states have call successors, (117) [2021-12-27 21:32:02,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 488 states to 488 states and 741 transitions. [2021-12-27 21:32:02,381 INFO L78 Accepts]: Start accepts. Automaton has 488 states and 741 transitions. Word has length 79 [2021-12-27 21:32:02,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:32:02,382 INFO L470 AbstractCegarLoop]: Abstraction has 488 states and 741 transitions. [2021-12-27 21:32:02,382 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 4.647058823529412) internal successors, (79), 17 states have internal predecessors, (79), 4 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2021-12-27 21:32:02,382 INFO L276 IsEmpty]: Start isEmpty. Operand 488 states and 741 transitions. [2021-12-27 21:32:02,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-12-27 21:32:02,384 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:32:02,384 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 5, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:32:02,411 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2021-12-27 21:32:02,599 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-12-27 21:32:02,599 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:32:02,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:32:02,600 INFO L85 PathProgramCache]: Analyzing trace with hash 1373307241, now seen corresponding path program 1 times [2021-12-27 21:32:02,600 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:32:02,600 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119994504] [2021-12-27 21:32:02,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:32:02,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:32:02,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:02,753 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-27 21:32:02,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:02,759 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-27 21:32:02,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:02,762 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-12-27 21:32:02,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:02,765 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-12-27 21:32:02,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:02,767 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-12-27 21:32:02,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:02,770 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-12-27 21:32:02,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:02,772 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-12-27 21:32:02,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:02,778 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-12-27 21:32:02,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:02,781 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-12-27 21:32:02,781 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:32:02,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119994504] [2021-12-27 21:32:02,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2119994504] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:32:02,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [268237391] [2021-12-27 21:32:02,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:32:02,782 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:32:02,782 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:32:02,784 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-27 21:32:02,795 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-12-27 21:32:02,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:02,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 29 conjunts are in the unsatisfiable core [2021-12-27 21:32:02,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:32:03,021 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-27 21:32:03,086 INFO L353 Elim1Store]: treesize reduction 42, result has 22.2 percent of original size [2021-12-27 21:32:03,086 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 29 treesize of output 28 [2021-12-27 21:32:03,153 INFO L353 Elim1Store]: treesize reduction 42, result has 22.2 percent of original size [2021-12-27 21:32:03,154 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 29 treesize of output 28 [2021-12-27 21:32:03,219 INFO L353 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-12-27 21:32:03,219 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 22 [2021-12-27 21:32:03,449 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 [2021-12-27 21:32:03,476 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 45 proven. 48 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-12-27 21:32:03,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:32:04,677 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 17 treesize of output 15 [2021-12-27 21:32:04,680 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 34 treesize of output 30 [2021-12-27 21:32:04,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [268237391] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:32:04,737 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-27 21:32:04,737 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2021-12-27 21:32:04,737 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089019187] [2021-12-27 21:32:04,737 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-27 21:32:04,738 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-12-27 21:32:04,739 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:32:04,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-12-27 21:32:04,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=817, Unknown=0, NotChecked=0, Total=930 [2021-12-27 21:32:04,740 INFO L87 Difference]: Start difference. First operand 488 states and 741 transitions. Second operand has 24 states, 24 states have (on average 3.9583333333333335) internal successors, (95), 24 states have internal predecessors, (95), 6 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) [2021-12-27 21:32:08,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:32:08,686 INFO L93 Difference]: Finished difference Result 1217 states and 1830 transitions. [2021-12-27 21:32:08,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-12-27 21:32:08,687 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.9583333333333335) internal successors, (95), 24 states have internal predecessors, (95), 6 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) Word has length 79 [2021-12-27 21:32:08,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:32:08,691 INFO L225 Difference]: With dead ends: 1217 [2021-12-27 21:32:08,692 INFO L226 Difference]: Without dead ends: 1215 [2021-12-27 21:32:08,695 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 118 SyntacticMatches, 10 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1867 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=587, Invalid=4814, Unknown=1, NotChecked=0, Total=5402 [2021-12-27 21:32:08,695 INFO L933 BasicCegarLoop]: 120 mSDtfsCounter, 315 mSDsluCounter, 896 mSDsCounter, 0 mSdLazyCounter, 1754 mSolverCounterSat, 425 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 328 SdHoareTripleChecker+Valid, 1016 SdHoareTripleChecker+Invalid, 2309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 425 IncrementalHoareTripleChecker+Valid, 1754 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 130 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-12-27 21:32:08,695 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [328 Valid, 1016 Invalid, 2309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [425 Valid, 1754 Invalid, 0 Unknown, 130 Unchecked, 0.9s Time] [2021-12-27 21:32:08,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1215 states. [2021-12-27 21:32:08,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1215 to 584. [2021-12-27 21:32:08,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 584 states, 430 states have (on average 1.4069767441860466) internal successors, (605), 431 states have internal predecessors, (605), 141 states have call successors, (141), 12 states have call predecessors, (141), 12 states have return successors, (141), 140 states have call predecessors, (141), 141 states have call successors, (141) [2021-12-27 21:32:08,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 584 states to 584 states and 887 transitions. [2021-12-27 21:32:08,945 INFO L78 Accepts]: Start accepts. Automaton has 584 states and 887 transitions. Word has length 79 [2021-12-27 21:32:08,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:32:08,946 INFO L470 AbstractCegarLoop]: Abstraction has 584 states and 887 transitions. [2021-12-27 21:32:08,946 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 3.9583333333333335) internal successors, (95), 24 states have internal predecessors, (95), 6 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) [2021-12-27 21:32:08,946 INFO L276 IsEmpty]: Start isEmpty. Operand 584 states and 887 transitions. [2021-12-27 21:32:08,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-12-27 21:32:08,948 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:32:08,948 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 6, 5, 5, 5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:32:08,972 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2021-12-27 21:32:09,163 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:32:09,163 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:32:09,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:32:09,164 INFO L85 PathProgramCache]: Analyzing trace with hash -739338403, now seen corresponding path program 6 times [2021-12-27 21:32:09,164 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:32:09,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [103479056] [2021-12-27 21:32:09,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:32:09,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:32:09,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:09,311 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-27 21:32:09,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:09,314 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-27 21:32:09,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:09,317 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-12-27 21:32:09,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:09,319 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-12-27 21:32:09,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:09,321 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-12-27 21:32:09,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:09,323 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-12-27 21:32:09,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:09,325 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-12-27 21:32:09,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:09,327 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-12-27 21:32:09,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:09,331 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-12-27 21:32:09,331 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:32:09,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [103479056] [2021-12-27 21:32:09,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [103479056] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:32:09,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2117089099] [2021-12-27 21:32:09,332 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-27 21:32:09,332 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:32:09,332 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:32:09,333 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-27 21:32:09,335 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-12-27 21:32:09,446 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-12-27 21:32:09,446 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 21:32:09,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 30 conjunts are in the unsatisfiable core [2021-12-27 21:32:09,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:32:09,536 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-27 21:32:09,566 INFO L353 Elim1Store]: treesize reduction 42, result has 22.2 percent of original size [2021-12-27 21:32:09,566 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 30 treesize of output 29 [2021-12-27 21:32:09,594 INFO L353 Elim1Store]: treesize reduction 42, result has 22.2 percent of original size [2021-12-27 21:32:09,594 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 30 treesize of output 29 [2021-12-27 21:32:09,782 INFO L353 Elim1Store]: treesize reduction 14, result has 17.6 percent of original size [2021-12-27 21:32:09,782 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 46 treesize of output 24 [2021-12-27 21:32:09,800 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-12-27 21:32:09,800 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:32:09,907 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 17 treesize of output 15 [2021-12-27 21:32:09,909 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 [2021-12-27 21:32:09,993 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-12-27 21:32:09,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2117089099] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:32:09,993 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:32:09,993 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 19 [2021-12-27 21:32:09,994 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769183226] [2021-12-27 21:32:09,994 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:32:09,994 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-12-27 21:32:09,994 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:32:09,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-12-27 21:32:09,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-12-27 21:32:09,995 INFO L87 Difference]: Start difference. First operand 584 states and 887 transitions. Second operand has 19 states, 19 states have (on average 4.473684210526316) internal successors, (85), 19 states have internal predecessors, (85), 4 states have call successors, (10), 1 states have call predecessors, (10), 1 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-12-27 21:32:21,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:32:21,534 INFO L93 Difference]: Finished difference Result 10261 states and 16448 transitions. [2021-12-27 21:32:21,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 193 states. [2021-12-27 21:32:21,535 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 4.473684210526316) internal successors, (85), 19 states have internal predecessors, (85), 4 states have call successors, (10), 1 states have call predecessors, (10), 1 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 83 [2021-12-27 21:32:21,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:32:21,570 INFO L225 Difference]: With dead ends: 10261 [2021-12-27 21:32:21,570 INFO L226 Difference]: Without dead ends: 10259 [2021-12-27 21:32:21,580 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 371 GetRequests, 169 SyntacticMatches, 9 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16108 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2956, Invalid=34874, Unknown=0, NotChecked=0, Total=37830 [2021-12-27 21:32:21,581 INFO L933 BasicCegarLoop]: 645 mSDtfsCounter, 348 mSDsluCounter, 2973 mSDsCounter, 0 mSdLazyCounter, 8526 mSolverCounterSat, 1710 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 384 SdHoareTripleChecker+Valid, 3618 SdHoareTripleChecker+Invalid, 10236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1710 IncrementalHoareTripleChecker+Valid, 8526 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2021-12-27 21:32:21,581 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [384 Valid, 3618 Invalid, 10236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1710 Valid, 8526 Invalid, 0 Unknown, 0 Unchecked, 4.5s Time] [2021-12-27 21:32:21,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10259 states. [2021-12-27 21:32:22,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10259 to 1376. [2021-12-27 21:32:22,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1376 states, 1006 states have (on average 1.4443339960238568) internal successors, (1453), 1007 states have internal predecessors, (1453), 357 states have call successors, (357), 12 states have call predecessors, (357), 12 states have return successors, (357), 356 states have call predecessors, (357), 357 states have call successors, (357) [2021-12-27 21:32:22,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1376 states to 1376 states and 2167 transitions. [2021-12-27 21:32:22,433 INFO L78 Accepts]: Start accepts. Automaton has 1376 states and 2167 transitions. Word has length 83 [2021-12-27 21:32:22,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:32:22,433 INFO L470 AbstractCegarLoop]: Abstraction has 1376 states and 2167 transitions. [2021-12-27 21:32:22,434 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 4.473684210526316) internal successors, (85), 19 states have internal predecessors, (85), 4 states have call successors, (10), 1 states have call predecessors, (10), 1 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-12-27 21:32:22,434 INFO L276 IsEmpty]: Start isEmpty. Operand 1376 states and 2167 transitions. [2021-12-27 21:32:22,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-12-27 21:32:22,436 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:32:22,436 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 6, 5, 5, 5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:32:22,460 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2021-12-27 21:32:22,659 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-12-27 21:32:22,659 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:32:22,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:32:22,659 INFO L85 PathProgramCache]: Analyzing trace with hash 1710261727, now seen corresponding path program 1 times [2021-12-27 21:32:22,659 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:32:22,659 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [783820707] [2021-12-27 21:32:22,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:32:22,660 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:32:22,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:22,828 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-27 21:32:22,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:22,832 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-27 21:32:22,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:22,834 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-12-27 21:32:22,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:22,836 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-12-27 21:32:22,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:22,838 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-12-27 21:32:22,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:22,841 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-12-27 21:32:22,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:22,843 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-12-27 21:32:22,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:22,845 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-12-27 21:32:22,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:22,848 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-12-27 21:32:22,848 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:32:22,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [783820707] [2021-12-27 21:32:22,849 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [783820707] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:32:22,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [217653335] [2021-12-27 21:32:22,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:32:22,849 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:32:22,849 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:32:22,850 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-27 21:32:22,852 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-12-27 21:32:22,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:32:22,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 29 conjunts are in the unsatisfiable core [2021-12-27 21:32:22,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:32:23,121 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-27 21:32:23,190 INFO L353 Elim1Store]: treesize reduction 42, result has 22.2 percent of original size [2021-12-27 21:32:23,191 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 29 treesize of output 28 [2021-12-27 21:32:23,247 INFO L353 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-12-27 21:32:23,247 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 22 [2021-12-27 21:32:23,475 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 [2021-12-27 21:32:23,509 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 36 proven. 66 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-12-27 21:32:23,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:32:26,229 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 17 treesize of output 15 [2021-12-27 21:32:26,236 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 34 treesize of output 30 [2021-12-27 21:32:26,291 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [217653335] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:32:26,291 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-27 21:32:26,291 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2021-12-27 21:32:26,291 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [712517794] [2021-12-27 21:32:26,291 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-27 21:32:26,292 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-12-27 21:32:26,292 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:32:26,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-12-27 21:32:26,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=995, Unknown=1, NotChecked=0, Total=1122 [2021-12-27 21:32:26,293 INFO L87 Difference]: Start difference. First operand 1376 states and 2167 transitions. Second operand has 26 states, 26 states have (on average 3.9615384615384617) internal successors, (103), 26 states have internal predecessors, (103), 6 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16)