./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/loop-lit/mcmillan2006.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b 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/loop-lit/mcmillan2006.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 45cd9f1eda35cecb580d3b7fe5199506be9e5041f2297c1c3e22e0a862fa68be --- Real Ultimate output --- This is Ultimate 0.2.2-839c364b5d67a0f615c82cb70ab247790648d4a9-839c364 [2021-12-14 13:51:08,474 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-14 13:51:08,477 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-14 13:51:08,500 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-14 13:51:08,502 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-14 13:51:08,505 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-14 13:51:08,507 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-14 13:51:08,509 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-14 13:51:08,511 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-14 13:51:08,515 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-14 13:51:08,516 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-14 13:51:08,518 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-14 13:51:08,518 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-14 13:51:08,521 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-14 13:51:08,522 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-14 13:51:08,524 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-14 13:51:08,525 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-14 13:51:08,525 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-14 13:51:08,529 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-14 13:51:08,533 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-14 13:51:08,537 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-14 13:51:08,537 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-14 13:51:08,538 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-14 13:51:08,539 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-14 13:51:08,541 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-14 13:51:08,542 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-14 13:51:08,543 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-14 13:51:08,543 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-14 13:51:08,544 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-14 13:51:08,545 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-14 13:51:08,545 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-14 13:51:08,546 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-14 13:51:08,546 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-14 13:51:08,547 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-14 13:51:08,548 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-14 13:51:08,548 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-14 13:51:08,549 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-14 13:51:08,550 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-14 13:51:08,550 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-14 13:51:08,550 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-14 13:51:08,551 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-14 13:51:08,551 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-14 13:51:08,568 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-14 13:51:08,583 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-14 13:51:08,583 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-14 13:51:08,584 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-14 13:51:08,584 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-14 13:51:08,584 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-14 13:51:08,585 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-14 13:51:08,585 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-14 13:51:08,585 INFO L138 SettingsManager]: * Use SBE=true [2021-12-14 13:51:08,585 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-14 13:51:08,585 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-14 13:51:08,586 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-14 13:51:08,586 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-14 13:51:08,586 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-14 13:51:08,586 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-14 13:51:08,587 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-14 13:51:08,587 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-14 13:51:08,587 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-14 13:51:08,587 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-14 13:51:08,587 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-14 13:51:08,587 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-14 13:51:08,588 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-14 13:51:08,588 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-14 13:51:08,588 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-14 13:51:08,588 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-14 13:51:08,588 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-14 13:51:08,588 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-14 13:51:08,588 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-14 13:51:08,589 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-14 13:51:08,589 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-14 13:51:08,589 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-14 13:51:08,589 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-14 13:51:08,589 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-14 13:51:08,589 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-14 13:51:08,589 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 45cd9f1eda35cecb580d3b7fe5199506be9e5041f2297c1c3e22e0a862fa68be [2021-12-14 13:51:08,747 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-14 13:51:08,760 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-14 13:51:08,762 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-14 13:51:08,763 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-14 13:51:08,764 INFO L275 PluginConnector]: CDTParser initialized [2021-12-14 13:51:08,765 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-lit/mcmillan2006.i [2021-12-14 13:51:08,828 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b1464c6ac/ad3dd274f79c422b8f949bfc698d6aae/FLAGd8a58adaf [2021-12-14 13:51:09,198 INFO L306 CDTParser]: Found 1 translation units. [2021-12-14 13:51:09,199 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-lit/mcmillan2006.i [2021-12-14 13:51:09,206 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b1464c6ac/ad3dd274f79c422b8f949bfc698d6aae/FLAGd8a58adaf [2021-12-14 13:51:09,218 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b1464c6ac/ad3dd274f79c422b8f949bfc698d6aae [2021-12-14 13:51:09,220 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-14 13:51:09,222 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-14 13:51:09,223 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-14 13:51:09,223 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-14 13:51:09,225 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-14 13:51:09,226 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 01:51:09" (1/1) ... [2021-12-14 13:51:09,227 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7d90b0ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:51:09, skipping insertion in model container [2021-12-14 13:51:09,228 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 01:51:09" (1/1) ... [2021-12-14 13:51:09,232 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-14 13:51:09,246 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-14 13:51:09,393 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/loop-lit/mcmillan2006.i[1009,1022] [2021-12-14 13:51:09,416 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-14 13:51:09,421 INFO L203 MainTranslator]: Completed pre-run [2021-12-14 13:51:09,429 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/loop-lit/mcmillan2006.i[1009,1022] [2021-12-14 13:51:09,432 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-14 13:51:09,440 INFO L208 MainTranslator]: Completed translation [2021-12-14 13:51:09,441 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:51:09 WrapperNode [2021-12-14 13:51:09,441 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-14 13:51:09,442 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-14 13:51:09,442 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-14 13:51:09,442 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-14 13:51:09,447 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:51:09" (1/1) ... [2021-12-14 13:51:09,452 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:51:09" (1/1) ... [2021-12-14 13:51:09,465 INFO L137 Inliner]: procedures = 18, calls = 10, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 46 [2021-12-14 13:51:09,466 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-14 13:51:09,466 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-14 13:51:09,466 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-14 13:51:09,466 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-14 13:51:09,471 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:51:09" (1/1) ... [2021-12-14 13:51:09,471 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:51:09" (1/1) ... [2021-12-14 13:51:09,472 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:51:09" (1/1) ... [2021-12-14 13:51:09,472 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:51:09" (1/1) ... [2021-12-14 13:51:09,479 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:51:09" (1/1) ... [2021-12-14 13:51:09,482 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:51:09" (1/1) ... [2021-12-14 13:51:09,482 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:51:09" (1/1) ... [2021-12-14 13:51:09,483 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-14 13:51:09,484 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-14 13:51:09,484 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-14 13:51:09,484 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-14 13:51:09,486 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:51:09" (1/1) ... [2021-12-14 13:51:09,491 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-14 13:51:09,499 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:09,513 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) [2021-12-14 13:51:09,519 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 [2021-12-14 13:51:09,538 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-14 13:51:09,538 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-14 13:51:09,538 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-12-14 13:51:09,538 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-14 13:51:09,539 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-14 13:51:09,539 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-14 13:51:09,539 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-12-14 13:51:09,577 INFO L236 CfgBuilder]: Building ICFG [2021-12-14 13:51:09,578 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-14 13:51:09,670 INFO L277 CfgBuilder]: Performing block encoding [2021-12-14 13:51:09,676 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-14 13:51:09,677 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-12-14 13:51:09,678 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 01:51:09 BoogieIcfgContainer [2021-12-14 13:51:09,678 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-14 13:51:09,689 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-14 13:51:09,703 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-14 13:51:09,706 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-14 13:51:09,706 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 01:51:09" (1/3) ... [2021-12-14 13:51:09,706 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3db7e097 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 01:51:09, skipping insertion in model container [2021-12-14 13:51:09,707 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:51:09" (2/3) ... [2021-12-14 13:51:09,707 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3db7e097 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 01:51:09, skipping insertion in model container [2021-12-14 13:51:09,707 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 01:51:09" (3/3) ... [2021-12-14 13:51:09,708 INFO L111 eAbstractionObserver]: Analyzing ICFG mcmillan2006.i [2021-12-14 13:51:09,711 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-14 13:51:09,712 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-14 13:51:09,757 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-14 13:51:09,770 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 [2021-12-14 13:51:09,770 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-14 13:51:09,780 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 14 states have (on average 1.5) internal successors, (21), 15 states have internal predecessors, (21), 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) [2021-12-14 13:51:09,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-12-14 13:51:09,792 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:09,793 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:09,793 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:09,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:09,801 INFO L85 PathProgramCache]: Analyzing trace with hash 186158361, now seen corresponding path program 1 times [2021-12-14 13:51:09,806 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:09,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [506477303] [2021-12-14 13:51:09,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:09,808 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:09,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:09,913 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:09,914 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:09,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [506477303] [2021-12-14 13:51:09,914 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [506477303] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 13:51:09,915 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-14 13:51:09,915 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-14 13:51:09,916 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384328698] [2021-12-14 13:51:09,916 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 13:51:09,919 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-14 13:51:09,919 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:09,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-14 13:51:09,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-14 13:51:09,946 INFO L87 Difference]: Start difference. First operand has 16 states, 14 states have (on average 1.5) internal successors, (21), 15 states have internal predecessors, (21), 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) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 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) [2021-12-14 13:51:09,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:09,956 INFO L93 Difference]: Finished difference Result 27 states and 34 transitions. [2021-12-14 13:51:09,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-14 13:51:09,958 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 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 8 [2021-12-14 13:51:09,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:09,964 INFO L225 Difference]: With dead ends: 27 [2021-12-14 13:51:09,964 INFO L226 Difference]: Without dead ends: 12 [2021-12-14 13:51:09,967 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-14 13:51:09,971 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:09,972 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 13:51:09,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-12-14 13:51:09,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-12-14 13:51:09,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 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) [2021-12-14 13:51:09,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2021-12-14 13:51:09,991 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 8 [2021-12-14 13:51:09,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:09,992 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2021-12-14 13:51:09,992 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 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) [2021-12-14 13:51:09,992 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2021-12-14 13:51:09,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-12-14 13:51:09,993 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:09,993 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:09,993 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-14 13:51:09,993 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:09,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:09,994 INFO L85 PathProgramCache]: Analyzing trace with hash 180617235, now seen corresponding path program 1 times [2021-12-14 13:51:09,994 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:09,994 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2067160238] [2021-12-14 13:51:09,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:09,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:10,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:10,081 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:10,082 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:10,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2067160238] [2021-12-14 13:51:10,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2067160238] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 13:51:10,082 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-14 13:51:10,082 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-14 13:51:10,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946375454] [2021-12-14 13:51:10,083 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 13:51:10,084 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-14 13:51:10,084 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:10,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-14 13:51:10,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-12-14 13:51:10,085 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 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) [2021-12-14 13:51:10,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:10,135 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2021-12-14 13:51:10,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-14 13:51:10,136 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 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 8 [2021-12-14 13:51:10,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:10,137 INFO L225 Difference]: With dead ends: 22 [2021-12-14 13:51:10,137 INFO L226 Difference]: Without dead ends: 14 [2021-12-14 13:51:10,138 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-12-14 13:51:10,140 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 4 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:10,141 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 30 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 13:51:10,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-12-14 13:51:10,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2021-12-14 13:51:10,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 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) [2021-12-14 13:51:10,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-12-14 13:51:10,146 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 8 [2021-12-14 13:51:10,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:10,146 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-12-14 13:51:10,147 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 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) [2021-12-14 13:51:10,147 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-12-14 13:51:10,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-12-14 13:51:10,148 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:10,148 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:10,149 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-14 13:51:10,149 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:10,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:10,149 INFO L85 PathProgramCache]: Analyzing trace with hash -875113359, now seen corresponding path program 1 times [2021-12-14 13:51:10,150 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:10,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [674371847] [2021-12-14 13:51:10,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:10,150 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:10,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:10,298 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:10,298 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:10,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [674371847] [2021-12-14 13:51:10,298 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [674371847] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:10,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1205285478] [2021-12-14 13:51:10,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:10,299 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:10,299 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:10,301 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) [2021-12-14 13:51:10,302 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-14 13:51:10,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:10,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 15 conjunts are in the unsatisfiable core [2021-12-14 13:51:10,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:10,388 INFO L388 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 18 treesize of output 14 [2021-12-14 13:51:10,438 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:10,438 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:10,489 INFO L388 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 14 treesize of output 12 [2021-12-14 13:51:10,491 INFO L388 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 22 treesize of output 20 [2021-12-14 13:51:10,502 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:10,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1205285478] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:10,502 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:10,502 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 11 [2021-12-14 13:51:10,503 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [471069606] [2021-12-14 13:51:10,503 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:10,503 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-14 13:51:10,503 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:10,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-14 13:51:10,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-12-14 13:51:10,504 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 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) [2021-12-14 13:51:10,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:10,556 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2021-12-14 13:51:10,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-14 13:51:10,556 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 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 10 [2021-12-14 13:51:10,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:10,557 INFO L225 Difference]: With dead ends: 21 [2021-12-14 13:51:10,557 INFO L226 Difference]: Without dead ends: 19 [2021-12-14 13:51:10,557 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 12 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2021-12-14 13:51:10,558 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 15 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:10,559 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 37 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 13:51:10,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-12-14 13:51:10,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 15. [2021-12-14 13:51:10,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 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) [2021-12-14 13:51:10,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-12-14 13:51:10,561 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2021-12-14 13:51:10,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:10,562 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-12-14 13:51:10,562 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 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) [2021-12-14 13:51:10,562 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-12-14 13:51:10,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-12-14 13:51:10,562 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:10,563 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:10,581 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-14 13:51:10,769 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:10,770 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:10,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:10,771 INFO L85 PathProgramCache]: Analyzing trace with hash -1418361721, now seen corresponding path program 1 times [2021-12-14 13:51:10,772 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:10,772 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1775807062] [2021-12-14 13:51:10,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:10,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:10,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:10,867 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:10,867 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:10,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1775807062] [2021-12-14 13:51:10,870 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1775807062] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:10,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [748744115] [2021-12-14 13:51:10,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:10,875 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:10,875 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:10,876 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) [2021-12-14 13:51:10,885 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-14 13:51:10,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:10,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-14 13:51:10,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:11,016 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:11,017 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:11,057 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:11,058 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [748744115] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:11,058 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:11,058 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 11 [2021-12-14 13:51:11,058 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1583424910] [2021-12-14 13:51:11,058 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:11,059 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-14 13:51:11,059 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:11,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-14 13:51:11,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2021-12-14 13:51:11,061 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 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) [2021-12-14 13:51:11,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:11,110 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2021-12-14 13:51:11,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-14 13:51:11,110 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 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 14 [2021-12-14 13:51:11,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:11,112 INFO L225 Difference]: With dead ends: 30 [2021-12-14 13:51:11,112 INFO L226 Difference]: Without dead ends: 18 [2021-12-14 13:51:11,113 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2021-12-14 13:51:11,115 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 11 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:11,116 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 39 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 13:51:11,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-12-14 13:51:11,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2021-12-14 13:51:11,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 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) [2021-12-14 13:51:11,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-12-14 13:51:11,122 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 14 [2021-12-14 13:51:11,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:11,123 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-12-14 13:51:11,123 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 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) [2021-12-14 13:51:11,123 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-12-14 13:51:11,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-12-14 13:51:11,124 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:11,124 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:11,141 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-14 13:51:11,345 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2021-12-14 13:51:11,346 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:11,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:11,347 INFO L85 PathProgramCache]: Analyzing trace with hash -324855195, now seen corresponding path program 2 times [2021-12-14 13:51:11,347 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:11,347 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [38461117] [2021-12-14 13:51:11,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:11,347 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:11,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:11,427 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:11,428 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:11,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [38461117] [2021-12-14 13:51:11,428 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [38461117] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:11,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [965419034] [2021-12-14 13:51:11,428 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-14 13:51:11,429 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:11,429 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:11,430 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) [2021-12-14 13:51:11,431 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-14 13:51:11,460 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-14 13:51:11,460 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:51:11,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-14 13:51:11,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:11,499 INFO L388 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 15 treesize of output 11 [2021-12-14 13:51:11,564 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:11,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:11,613 INFO L388 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 16 treesize of output 14 [2021-12-14 13:51:11,615 INFO L388 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 24 [2021-12-14 13:51:11,630 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:11,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [965419034] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:11,630 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:11,630 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 12 [2021-12-14 13:51:11,630 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510367094] [2021-12-14 13:51:11,631 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:11,631 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-14 13:51:11,631 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:11,631 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-14 13:51:11,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-12-14 13:51:11,632 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 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) [2021-12-14 13:51:11,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:11,720 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2021-12-14 13:51:11,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-14 13:51:11,720 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 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 16 [2021-12-14 13:51:11,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:11,721 INFO L225 Difference]: With dead ends: 27 [2021-12-14 13:51:11,721 INFO L226 Difference]: Without dead ends: 25 [2021-12-14 13:51:11,721 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 24 SyntacticMatches, 5 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2021-12-14 13:51:11,722 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 19 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:11,722 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 51 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 13:51:11,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-12-14 13:51:11,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 21. [2021-12-14 13:51:11,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.1) internal successors, (22), 20 states have internal predecessors, (22), 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) [2021-12-14 13:51:11,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2021-12-14 13:51:11,725 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 16 [2021-12-14 13:51:11,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:11,725 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2021-12-14 13:51:11,725 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 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) [2021-12-14 13:51:11,725 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2021-12-14 13:51:11,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-12-14 13:51:11,726 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:11,726 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:11,744 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-14 13:51:11,944 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:11,944 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:11,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:11,945 INFO L85 PathProgramCache]: Analyzing trace with hash 1610985595, now seen corresponding path program 3 times [2021-12-14 13:51:11,945 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:11,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [784375745] [2021-12-14 13:51:11,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:11,945 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:11,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:12,024 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:12,025 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:12,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [784375745] [2021-12-14 13:51:12,025 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [784375745] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:12,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1459947663] [2021-12-14 13:51:12,025 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-14 13:51:12,026 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:12,026 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:12,028 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) [2021-12-14 13:51:12,029 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-14 13:51:12,064 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-12-14 13:51:12,065 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:51:12,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-14 13:51:12,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:12,144 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:12,144 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:12,186 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:12,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1459947663] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:12,186 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:12,187 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-12-14 13:51:12,187 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1945408904] [2021-12-14 13:51:12,187 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:12,187 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-12-14 13:51:12,187 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:12,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-12-14 13:51:12,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2021-12-14 13:51:12,188 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 14 states have internal predecessors, (38), 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) [2021-12-14 13:51:12,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:12,249 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2021-12-14 13:51:12,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-14 13:51:12,250 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 14 states have internal predecessors, (38), 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 20 [2021-12-14 13:51:12,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:12,250 INFO L225 Difference]: With dead ends: 40 [2021-12-14 13:51:12,250 INFO L226 Difference]: Without dead ends: 24 [2021-12-14 13:51:12,251 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=82, Invalid=224, Unknown=0, NotChecked=0, Total=306 [2021-12-14 13:51:12,251 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 18 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:12,251 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 62 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 13:51:12,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-12-14 13:51:12,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2021-12-14 13:51:12,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 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) [2021-12-14 13:51:12,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2021-12-14 13:51:12,254 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2021-12-14 13:51:12,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:12,254 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2021-12-14 13:51:12,254 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 14 states have internal predecessors, (38), 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) [2021-12-14 13:51:12,254 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2021-12-14 13:51:12,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-12-14 13:51:12,255 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:12,255 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:12,271 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-14 13:51:12,471 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:12,471 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:12,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:12,472 INFO L85 PathProgramCache]: Analyzing trace with hash 731310041, now seen corresponding path program 4 times [2021-12-14 13:51:12,472 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:12,472 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2038313450] [2021-12-14 13:51:12,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:12,472 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:12,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:12,577 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:12,577 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:12,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2038313450] [2021-12-14 13:51:12,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2038313450] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:12,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2113508953] [2021-12-14 13:51:12,577 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-14 13:51:12,577 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:12,578 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:12,578 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) [2021-12-14 13:51:12,579 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-14 13:51:12,626 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-14 13:51:12,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:51:12,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-14 13:51:12,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:12,679 INFO L388 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 15 treesize of output 11 [2021-12-14 13:51:12,924 INFO L354 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-12-14 13:51:12,924 INFO L388 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 44 treesize of output 23 [2021-12-14 13:51:12,941 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:12,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:13,175 INFO L388 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 18 treesize of output 16 [2021-12-14 13:51:13,182 INFO L388 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 28 [2021-12-14 13:51:13,194 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:13,194 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2113508953] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:13,194 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:13,194 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 12] total 27 [2021-12-14 13:51:13,194 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103957892] [2021-12-14 13:51:13,194 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:13,194 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-14 13:51:13,194 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:13,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-14 13:51:13,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=599, Unknown=0, NotChecked=0, Total=702 [2021-12-14 13:51:13,195 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 27 states, 27 states have (on average 2.0) internal successors, (54), 27 states have internal predecessors, (54), 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) [2021-12-14 13:51:13,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:13,363 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2021-12-14 13:51:13,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-12-14 13:51:13,363 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.0) internal successors, (54), 27 states have internal predecessors, (54), 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 22 [2021-12-14 13:51:13,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:13,363 INFO L225 Difference]: With dead ends: 41 [2021-12-14 13:51:13,364 INFO L226 Difference]: Without dead ends: 25 [2021-12-14 13:51:13,364 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 277 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=188, Invalid=1144, Unknown=0, NotChecked=0, Total=1332 [2021-12-14 13:51:13,365 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 11 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 51 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:13,366 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 84 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 41 Invalid, 0 Unknown, 51 Unchecked, 0.0s Time] [2021-12-14 13:51:13,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-12-14 13:51:13,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-12-14 13:51:13,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 24 states have internal predecessors, (26), 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) [2021-12-14 13:51:13,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2021-12-14 13:51:13,368 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2021-12-14 13:51:13,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:13,368 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2021-12-14 13:51:13,368 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.0) internal successors, (54), 27 states have internal predecessors, (54), 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) [2021-12-14 13:51:13,368 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2021-12-14 13:51:13,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-12-14 13:51:13,369 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:13,369 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:13,388 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-14 13:51:13,577 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:13,578 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:13,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:13,578 INFO L85 PathProgramCache]: Analyzing trace with hash 1471659959, now seen corresponding path program 5 times [2021-12-14 13:51:13,578 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:13,578 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1156038463] [2021-12-14 13:51:13,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:13,578 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:13,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:13,678 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:13,679 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:13,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1156038463] [2021-12-14 13:51:13,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1156038463] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:13,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1989971120] [2021-12-14 13:51:13,679 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-14 13:51:13,679 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:13,679 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:13,680 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) [2021-12-14 13:51:13,681 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-14 13:51:13,715 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-12-14 13:51:13,715 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:51:13,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-14 13:51:13,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:13,738 INFO L388 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 15 treesize of output 11 [2021-12-14 13:51:13,774 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-12-14 13:51:13,774 INFO L388 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 27 treesize of output 26 [2021-12-14 13:51:13,860 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:13,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:13,937 INFO L388 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 16 treesize of output 14 [2021-12-14 13:51:13,941 INFO L388 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 24 [2021-12-14 13:51:13,956 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:13,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1989971120] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:13,956 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:13,956 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 18 [2021-12-14 13:51:13,957 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991101981] [2021-12-14 13:51:13,957 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:13,957 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-14 13:51:13,957 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:13,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-14 13:51:13,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2021-12-14 13:51:13,957 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 18 states have internal predecessors, (41), 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) [2021-12-14 13:51:14,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:14,106 INFO L93 Difference]: Finished difference Result 49 states and 51 transitions. [2021-12-14 13:51:14,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-14 13:51:14,107 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 18 states have internal predecessors, (41), 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 24 [2021-12-14 13:51:14,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:14,107 INFO L225 Difference]: With dead ends: 49 [2021-12-14 13:51:14,107 INFO L226 Difference]: Without dead ends: 47 [2021-12-14 13:51:14,107 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 36 SyntacticMatches, 6 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=463, Unknown=0, NotChecked=0, Total=552 [2021-12-14 13:51:14,108 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 21 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 19 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:14,108 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 143 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 209 Invalid, 0 Unknown, 19 Unchecked, 0.1s Time] [2021-12-14 13:51:14,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-12-14 13:51:14,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 32. [2021-12-14 13:51:14,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.096774193548387) internal successors, (34), 31 states have internal predecessors, (34), 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) [2021-12-14 13:51:14,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2021-12-14 13:51:14,111 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 24 [2021-12-14 13:51:14,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:14,111 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2021-12-14 13:51:14,111 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 18 states have internal predecessors, (41), 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) [2021-12-14 13:51:14,111 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2021-12-14 13:51:14,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-12-14 13:51:14,112 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:14,112 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:14,130 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-14 13:51:14,327 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:14,328 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:14,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:14,328 INFO L85 PathProgramCache]: Analyzing trace with hash -16639979, now seen corresponding path program 6 times [2021-12-14 13:51:14,328 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:14,328 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2053651269] [2021-12-14 13:51:14,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:14,329 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:14,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:14,444 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:14,444 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:14,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2053651269] [2021-12-14 13:51:14,444 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2053651269] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:14,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [447203926] [2021-12-14 13:51:14,445 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-14 13:51:14,445 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:14,445 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:14,468 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) [2021-12-14 13:51:14,468 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-14 13:51:14,507 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-12-14 13:51:14,507 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:51:14,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 29 conjunts are in the unsatisfiable core [2021-12-14 13:51:14,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:14,554 INFO L388 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 15 treesize of output 11 [2021-12-14 13:51:14,600 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-12-14 13:51:14,601 INFO L388 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 25 treesize of output 24 [2021-12-14 13:51:14,651 INFO L354 Elim1Store]: treesize reduction 25, result has 37.5 percent of original size [2021-12-14 13:51:14,652 INFO L388 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 25 treesize of output 30 [2021-12-14 13:51:14,814 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:14,815 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:16,966 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~i~0#1| Int)) (or (< (+ |ULTIMATE.start_main_~i~0#1| 1) |c_ULTIMATE.start_main_~n~0#1|) (forall ((v_ArrVal_119 Int)) (= (select (store (select |c_#memory_int| |c_ULTIMATE.start_main_~x~0#1.base|) (+ (* |ULTIMATE.start_main_~i~0#1| 4) |c_ULTIMATE.start_main_~x~0#1.offset|) v_ArrVal_119) (+ 8 |c_ULTIMATE.start_main_~x~0#1.offset|)) 0)))) is different from false [2021-12-14 13:51:17,110 INFO L388 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 16 treesize of output 14 [2021-12-14 13:51:17,112 INFO L388 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 24 [2021-12-14 13:51:17,144 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 9 not checked. [2021-12-14 13:51:17,144 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [447203926] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:17,145 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:17,145 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15, 15] total 24 [2021-12-14 13:51:17,145 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302156275] [2021-12-14 13:51:17,145 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:17,145 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-12-14 13:51:17,146 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:17,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-12-14 13:51:17,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=423, Unknown=1, NotChecked=42, Total=552 [2021-12-14 13:51:17,146 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 24 states, 24 states have (on average 2.125) internal successors, (51), 24 states have internal predecessors, (51), 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) [2021-12-14 13:51:19,207 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((|ULTIMATE.start_main_~i~0#1| Int)) (or (< (+ |ULTIMATE.start_main_~i~0#1| 1) |c_ULTIMATE.start_main_~n~0#1|) (forall ((v_ArrVal_119 Int)) (= (select (store (select |c_#memory_int| |c_ULTIMATE.start_main_~x~0#1.base|) (+ (* |ULTIMATE.start_main_~i~0#1| 4) |c_ULTIMATE.start_main_~x~0#1.offset|) v_ArrVal_119) (+ 8 |c_ULTIMATE.start_main_~x~0#1.offset|)) 0)))) (= (select (select |c_#memory_int| |c_ULTIMATE.start_main_~x~0#1.base|) (+ 8 |c_ULTIMATE.start_main_~x~0#1.offset|)) 0) (<= 3 |c_ULTIMATE.start_main_~i~0#1|) (< 3 |c_ULTIMATE.start_main_~n~0#1|)) is different from false [2021-12-14 13:51:19,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:19,307 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2021-12-14 13:51:19,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-14 13:51:19,308 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.125) internal successors, (51), 24 states have internal predecessors, (51), 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 26 [2021-12-14 13:51:19,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:19,308 INFO L225 Difference]: With dead ends: 47 [2021-12-14 13:51:19,308 INFO L226 Difference]: Without dead ends: 45 [2021-12-14 13:51:19,309 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 38 SyntacticMatches, 6 SemanticMatches, 31 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=149, Invalid=787, Unknown=2, NotChecked=118, Total=1056 [2021-12-14 13:51:19,309 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 48 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 29 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:19,309 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 85 Invalid, 237 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 168 Invalid, 0 Unknown, 29 Unchecked, 0.1s Time] [2021-12-14 13:51:19,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-12-14 13:51:19,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 29. [2021-12-14 13:51:19,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 28 states have internal predecessors, (30), 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) [2021-12-14 13:51:19,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2021-12-14 13:51:19,312 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2021-12-14 13:51:19,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:19,312 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2021-12-14 13:51:19,312 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.125) internal successors, (51), 24 states have internal predecessors, (51), 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) [2021-12-14 13:51:19,313 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2021-12-14 13:51:19,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-12-14 13:51:19,313 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:19,313 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:19,335 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-12-14 13:51:19,513 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:19,513 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:19,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:19,514 INFO L85 PathProgramCache]: Analyzing trace with hash 985881805, now seen corresponding path program 7 times [2021-12-14 13:51:19,514 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:19,514 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [590830789] [2021-12-14 13:51:19,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:19,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:19,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:19,673 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:19,673 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:19,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [590830789] [2021-12-14 13:51:19,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [590830789] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:19,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1609793937] [2021-12-14 13:51:19,674 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-14 13:51:19,674 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:19,674 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:19,675 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) [2021-12-14 13:51:19,676 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-14 13:51:19,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:19,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 25 conjunts are in the unsatisfiable core [2021-12-14 13:51:19,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:19,741 INFO L388 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 15 treesize of output 11 [2021-12-14 13:51:19,917 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:19,917 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:19,975 INFO L388 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 16 treesize of output 14 [2021-12-14 13:51:19,976 INFO L388 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 24 [2021-12-14 13:51:20,003 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:20,003 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1609793937] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:20,003 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:20,003 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 18 [2021-12-14 13:51:20,003 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [867925816] [2021-12-14 13:51:20,004 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:20,004 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-14 13:51:20,004 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:20,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-14 13:51:20,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=262, Unknown=0, NotChecked=0, Total=306 [2021-12-14 13:51:20,004 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand has 18 states, 18 states have (on average 2.611111111111111) internal successors, (47), 18 states have internal predecessors, (47), 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) [2021-12-14 13:51:20,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:20,169 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2021-12-14 13:51:20,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-12-14 13:51:20,170 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.611111111111111) internal successors, (47), 18 states have internal predecessors, (47), 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 28 [2021-12-14 13:51:20,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:20,170 INFO L225 Difference]: With dead ends: 39 [2021-12-14 13:51:20,170 INFO L226 Difference]: Without dead ends: 37 [2021-12-14 13:51:20,171 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 46 SyntacticMatches, 5 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=92, Invalid=508, Unknown=0, NotChecked=0, Total=600 [2021-12-14 13:51:20,171 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 25 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:20,171 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 124 Invalid, 287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 268 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-14 13:51:20,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-12-14 13:51:20,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 33. [2021-12-14 13:51:20,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.0625) internal successors, (34), 32 states have internal predecessors, (34), 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) [2021-12-14 13:51:20,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2021-12-14 13:51:20,174 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 28 [2021-12-14 13:51:20,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:20,174 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2021-12-14 13:51:20,174 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.611111111111111) internal successors, (47), 18 states have internal predecessors, (47), 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) [2021-12-14 13:51:20,175 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2021-12-14 13:51:20,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-12-14 13:51:20,175 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:20,175 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:20,192 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-12-14 13:51:20,383 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-12-14 13:51:20,383 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:20,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:20,384 INFO L85 PathProgramCache]: Analyzing trace with hash 1173257955, now seen corresponding path program 8 times [2021-12-14 13:51:20,384 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:20,384 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1151271060] [2021-12-14 13:51:20,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:20,384 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:20,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:20,471 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 19 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:20,471 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:20,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1151271060] [2021-12-14 13:51:20,471 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1151271060] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:20,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [424461481] [2021-12-14 13:51:20,471 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-14 13:51:20,471 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:20,472 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:20,483 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) [2021-12-14 13:51:20,484 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-14 13:51:20,521 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-14 13:51:20,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:51:20,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-14 13:51:20,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:20,662 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 32 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:20,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:20,716 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 32 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:20,716 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [424461481] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:20,716 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:20,716 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-12-14 13:51:20,716 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662015483] [2021-12-14 13:51:20,716 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:20,717 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-14 13:51:20,717 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:20,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-14 13:51:20,717 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=285, Unknown=0, NotChecked=0, Total=380 [2021-12-14 13:51:20,717 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand has 20 states, 20 states have (on average 2.9) internal successors, (58), 20 states have internal predecessors, (58), 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) [2021-12-14 13:51:20,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:20,802 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2021-12-14 13:51:20,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-14 13:51:20,803 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.9) internal successors, (58), 20 states have internal predecessors, (58), 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 32 [2021-12-14 13:51:20,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:20,803 INFO L225 Difference]: With dead ends: 60 [2021-12-14 13:51:20,803 INFO L226 Difference]: Without dead ends: 36 [2021-12-14 13:51:20,803 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=161, Invalid=489, Unknown=0, NotChecked=0, Total=650 [2021-12-14 13:51:20,804 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 20 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:20,804 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 86 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 13:51:20,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-12-14 13:51:20,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2021-12-14 13:51:20,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 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) [2021-12-14 13:51:20,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2021-12-14 13:51:20,807 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2021-12-14 13:51:20,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:20,807 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2021-12-14 13:51:20,807 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.9) internal successors, (58), 20 states have internal predecessors, (58), 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) [2021-12-14 13:51:20,807 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2021-12-14 13:51:20,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-12-14 13:51:20,807 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:20,808 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:20,841 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-12-14 13:51:21,008 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:21,008 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:21,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:21,008 INFO L85 PathProgramCache]: Analyzing trace with hash -92169919, now seen corresponding path program 9 times [2021-12-14 13:51:21,008 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:21,009 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [196552053] [2021-12-14 13:51:21,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:21,009 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:21,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:21,163 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:21,163 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:21,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [196552053] [2021-12-14 13:51:21,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [196552053] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:21,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1022983922] [2021-12-14 13:51:21,163 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-14 13:51:21,163 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:21,163 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:21,164 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) [2021-12-14 13:51:21,193 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-14 13:51:21,237 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-12-14 13:51:21,238 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:51:21,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-14 13:51:21,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:21,314 INFO L388 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 15 treesize of output 11 [2021-12-14 13:51:21,656 INFO L354 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-12-14 13:51:21,656 INFO L388 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 44 treesize of output 23 [2021-12-14 13:51:21,673 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 28 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:21,673 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:22,034 INFO L388 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 18 treesize of output 16 [2021-12-14 13:51:22,036 INFO L388 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 28 [2021-12-14 13:51:22,052 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 24 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:22,052 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1022983922] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:22,052 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:22,052 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 16] total 37 [2021-12-14 13:51:22,052 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [884041507] [2021-12-14 13:51:22,052 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:22,052 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-12-14 13:51:22,052 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:22,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-12-14 13:51:22,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=1160, Unknown=0, NotChecked=0, Total=1332 [2021-12-14 13:51:22,053 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand has 37 states, 37 states have (on average 2.324324324324324) internal successors, (86), 37 states have internal predecessors, (86), 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) [2021-12-14 13:51:22,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:22,418 INFO L93 Difference]: Finished difference Result 61 states and 63 transitions. [2021-12-14 13:51:22,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-12-14 13:51:22,418 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.324324324324324) internal successors, (86), 37 states have internal predecessors, (86), 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 34 [2021-12-14 13:51:22,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:22,419 INFO L225 Difference]: With dead ends: 61 [2021-12-14 13:51:22,419 INFO L226 Difference]: Without dead ends: 37 [2021-12-14 13:51:22,420 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 621 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=389, Invalid=2803, Unknown=0, NotChecked=0, Total=3192 [2021-12-14 13:51:22,420 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 28 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 237 SdHoareTripleChecker+Invalid, 237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 117 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:22,420 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 237 Invalid, 237 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 118 Invalid, 0 Unknown, 117 Unchecked, 0.0s Time] [2021-12-14 13:51:22,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-12-14 13:51:22,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-12-14 13:51:22,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.0555555555555556) internal successors, (38), 36 states have internal predecessors, (38), 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) [2021-12-14 13:51:22,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2021-12-14 13:51:22,423 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2021-12-14 13:51:22,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:22,423 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2021-12-14 13:51:22,424 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.324324324324324) internal successors, (86), 37 states have internal predecessors, (86), 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) [2021-12-14 13:51:22,424 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2021-12-14 13:51:22,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-12-14 13:51:22,424 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:22,424 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:22,443 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-12-14 13:51:22,635 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-12-14 13:51:22,635 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:22,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:22,636 INFO L85 PathProgramCache]: Analyzing trace with hash -692612065, now seen corresponding path program 10 times [2021-12-14 13:51:22,636 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:22,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1885401450] [2021-12-14 13:51:22,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:22,636 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:22,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:22,794 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:22,794 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:22,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1885401450] [2021-12-14 13:51:22,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1885401450] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:22,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1011831069] [2021-12-14 13:51:22,794 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-14 13:51:22,794 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:22,794 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:22,798 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) [2021-12-14 13:51:22,799 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-14 13:51:22,852 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-14 13:51:22,852 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:51:22,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 32 conjunts are in the unsatisfiable core [2021-12-14 13:51:22,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:22,888 INFO L388 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 15 treesize of output 11 [2021-12-14 13:51:22,929 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-12-14 13:51:22,929 INFO L388 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 27 treesize of output 26 [2021-12-14 13:51:23,074 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:23,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:23,175 INFO L388 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 16 treesize of output 14 [2021-12-14 13:51:23,177 INFO L388 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 24 [2021-12-14 13:51:23,208 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:23,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1011831069] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:23,208 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:23,208 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 24 [2021-12-14 13:51:23,208 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [744907192] [2021-12-14 13:51:23,208 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:23,208 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-12-14 13:51:23,208 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:23,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-12-14 13:51:23,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=488, Unknown=0, NotChecked=0, Total=552 [2021-12-14 13:51:23,209 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand has 24 states, 24 states have (on average 2.5416666666666665) internal successors, (61), 24 states have internal predecessors, (61), 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) [2021-12-14 13:51:23,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:23,452 INFO L93 Difference]: Finished difference Result 69 states and 71 transitions. [2021-12-14 13:51:23,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-12-14 13:51:23,452 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.5416666666666665) internal successors, (61), 24 states have internal predecessors, (61), 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 36 [2021-12-14 13:51:23,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:23,452 INFO L225 Difference]: With dead ends: 69 [2021-12-14 13:51:23,452 INFO L226 Difference]: Without dead ends: 67 [2021-12-14 13:51:23,453 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 58 SyntacticMatches, 6 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=119, Invalid=873, Unknown=0, NotChecked=0, Total=992 [2021-12-14 13:51:23,453 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 25 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 440 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 245 SdHoareTripleChecker+Invalid, 459 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:23,453 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 245 Invalid, 459 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 440 Invalid, 0 Unknown, 1 Unchecked, 0.2s Time] [2021-12-14 13:51:23,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-12-14 13:51:23,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 44. [2021-12-14 13:51:23,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.069767441860465) internal successors, (46), 43 states have internal predecessors, (46), 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) [2021-12-14 13:51:23,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2021-12-14 13:51:23,457 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 36 [2021-12-14 13:51:23,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:23,457 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2021-12-14 13:51:23,457 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.5416666666666665) internal successors, (61), 24 states have internal predecessors, (61), 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) [2021-12-14 13:51:23,457 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2021-12-14 13:51:23,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-12-14 13:51:23,458 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:23,458 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:23,475 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2021-12-14 13:51:23,667 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-12-14 13:51:23,667 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:23,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:23,668 INFO L85 PathProgramCache]: Analyzing trace with hash 2103070589, now seen corresponding path program 11 times [2021-12-14 13:51:23,668 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:23,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1590574328] [2021-12-14 13:51:23,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:23,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:23,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:23,839 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:23,840 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:23,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1590574328] [2021-12-14 13:51:23,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1590574328] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:23,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1770792976] [2021-12-14 13:51:23,840 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-14 13:51:23,840 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:23,840 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:23,850 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) [2021-12-14 13:51:23,851 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-12-14 13:51:23,907 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-12-14 13:51:23,907 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:51:23,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 35 conjunts are in the unsatisfiable core [2021-12-14 13:51:23,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:23,943 INFO L388 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 15 treesize of output 11 [2021-12-14 13:51:23,971 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-12-14 13:51:23,972 INFO L388 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 25 treesize of output 24 [2021-12-14 13:51:24,000 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-12-14 13:51:24,000 INFO L388 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 25 treesize of output 24 [2021-12-14 13:51:24,134 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 1 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:24,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:24,276 INFO L388 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 16 treesize of output 14 [2021-12-14 13:51:24,278 INFO L388 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 24 [2021-12-14 13:51:24,309 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-14 13:51:24,310 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1770792976] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:24,310 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:24,310 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 25 [2021-12-14 13:51:24,310 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805864509] [2021-12-14 13:51:24,310 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:24,310 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-12-14 13:51:24,310 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:24,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-12-14 13:51:24,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=530, Unknown=0, NotChecked=0, Total=600 [2021-12-14 13:51:24,311 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand has 25 states, 25 states have (on average 2.6) internal successors, (65), 25 states have internal predecessors, (65), 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) [2021-12-14 13:51:24,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:24,608 INFO L93 Difference]: Finished difference Result 67 states and 69 transitions. [2021-12-14 13:51:24,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-12-14 13:51:24,608 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.6) internal successors, (65), 25 states have internal predecessors, (65), 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 38 [2021-12-14 13:51:24,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:24,609 INFO L225 Difference]: With dead ends: 67 [2021-12-14 13:51:24,609 INFO L226 Difference]: Without dead ends: 65 [2021-12-14 13:51:24,609 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 61 SyntacticMatches, 8 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=197, Invalid=1135, Unknown=0, NotChecked=0, Total=1332 [2021-12-14 13:51:24,610 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 85 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 421 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 482 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 421 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:24,610 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 149 Invalid, 482 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 421 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-14 13:51:24,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-12-14 13:51:24,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 41. [2021-12-14 13:51:24,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.05) internal successors, (42), 40 states have internal predecessors, (42), 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) [2021-12-14 13:51:24,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2021-12-14 13:51:24,614 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2021-12-14 13:51:24,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:24,614 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2021-12-14 13:51:24,614 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.6) internal successors, (65), 25 states have internal predecessors, (65), 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) [2021-12-14 13:51:24,614 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2021-12-14 13:51:24,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-12-14 13:51:24,615 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:24,615 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:24,631 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2021-12-14 13:51:24,815 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,SelfDestructingSolverStorable13 [2021-12-14 13:51:24,815 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:24,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:24,816 INFO L85 PathProgramCache]: Analyzing trace with hash -747455179, now seen corresponding path program 12 times [2021-12-14 13:51:24,816 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:24,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1522271987] [2021-12-14 13:51:24,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:24,816 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:24,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:24,981 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:24,981 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:24,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1522271987] [2021-12-14 13:51:24,981 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1522271987] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:24,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2038146010] [2021-12-14 13:51:24,981 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-14 13:51:24,981 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:24,981 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:24,982 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) [2021-12-14 13:51:24,983 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-12-14 13:51:25,032 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-12-14 13:51:25,033 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:51:25,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-14 13:51:25,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:25,126 INFO L388 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 15 treesize of output 11 [2021-12-14 13:51:25,558 INFO L354 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-12-14 13:51:25,560 INFO L388 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 44 treesize of output 23 [2021-12-14 13:51:25,579 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 45 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:25,579 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:26,222 INFO L388 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 18 treesize of output 16 [2021-12-14 13:51:26,228 INFO L388 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 28 [2021-12-14 13:51:26,250 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 40 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:26,250 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2038146010] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:26,250 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:26,250 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18, 18] total 42 [2021-12-14 13:51:26,251 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1532484644] [2021-12-14 13:51:26,251 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:26,251 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-12-14 13:51:26,251 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:26,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-12-14 13:51:26,252 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=1507, Unknown=1, NotChecked=0, Total=1722 [2021-12-14 13:51:26,252 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand has 42 states, 42 states have (on average 2.4285714285714284) internal successors, (102), 42 states have internal predecessors, (102), 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) [2021-12-14 13:51:26,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:26,566 INFO L93 Difference]: Finished difference Result 71 states and 73 transitions. [2021-12-14 13:51:26,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-12-14 13:51:26,573 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.4285714285714284) internal successors, (102), 42 states have internal predecessors, (102), 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 40 [2021-12-14 13:51:26,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:26,574 INFO L225 Difference]: With dead ends: 71 [2021-12-14 13:51:26,574 INFO L226 Difference]: Without dead ends: 43 [2021-12-14 13:51:26,576 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 694 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=419, Invalid=3240, Unknown=1, NotChecked=0, Total=3660 [2021-12-14 13:51:26,577 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 28 mSDsluCounter, 244 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 260 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 77 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:26,577 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 260 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 128 Invalid, 0 Unknown, 77 Unchecked, 0.0s Time] [2021-12-14 13:51:26,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-12-14 13:51:26,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-12-14 13:51:26,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 42 states have internal predecessors, (44), 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) [2021-12-14 13:51:26,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2021-12-14 13:51:26,581 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2021-12-14 13:51:26,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:26,581 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2021-12-14 13:51:26,581 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 2.4285714285714284) internal successors, (102), 42 states have internal predecessors, (102), 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) [2021-12-14 13:51:26,582 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2021-12-14 13:51:26,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-12-14 13:51:26,582 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:26,582 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:26,617 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2021-12-14 13:51:26,799 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,SelfDestructingSolverStorable14 [2021-12-14 13:51:26,799 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:26,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:26,800 INFO L85 PathProgramCache]: Analyzing trace with hash -1452500589, now seen corresponding path program 13 times [2021-12-14 13:51:26,800 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:26,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1891582646] [2021-12-14 13:51:26,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:26,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:26,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:26,997 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:26,997 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:26,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1891582646] [2021-12-14 13:51:26,997 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1891582646] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:26,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1331958936] [2021-12-14 13:51:26,998 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-14 13:51:26,998 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:26,998 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:26,999 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) [2021-12-14 13:51:27,031 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-12-14 13:51:27,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:27,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 36 conjunts are in the unsatisfiable core [2021-12-14 13:51:27,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:27,098 INFO L388 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 15 treesize of output 11 [2021-12-14 13:51:27,145 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-12-14 13:51:27,145 INFO L388 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 27 treesize of output 26 [2021-12-14 13:51:27,330 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:27,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:27,443 INFO L388 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 16 treesize of output 14 [2021-12-14 13:51:27,447 INFO L388 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 24 [2021-12-14 13:51:27,479 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:27,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1331958936] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:27,479 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:27,479 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 27 [2021-12-14 13:51:27,479 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [824028596] [2021-12-14 13:51:27,479 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:27,480 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-14 13:51:27,480 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:27,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-14 13:51:27,480 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=630, Unknown=0, NotChecked=0, Total=702 [2021-12-14 13:51:27,481 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand has 27 states, 27 states have (on average 2.6296296296296298) internal successors, (71), 27 states have internal predecessors, (71), 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) [2021-12-14 13:51:27,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:27,807 INFO L93 Difference]: Finished difference Result 79 states and 81 transitions. [2021-12-14 13:51:27,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-12-14 13:51:27,808 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.6296296296296298) internal successors, (71), 27 states have internal predecessors, (71), 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 42 [2021-12-14 13:51:27,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:27,808 INFO L225 Difference]: With dead ends: 79 [2021-12-14 13:51:27,808 INFO L226 Difference]: Without dead ends: 77 [2021-12-14 13:51:27,809 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 69 SyntacticMatches, 6 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=134, Invalid=1126, Unknown=0, NotChecked=0, Total=1260 [2021-12-14 13:51:27,809 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 24 mSDsluCounter, 299 mSDsCounter, 0 mSdLazyCounter, 476 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 319 SdHoareTripleChecker+Invalid, 525 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 476 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 30 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:27,809 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 319 Invalid, 525 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 476 Invalid, 0 Unknown, 30 Unchecked, 0.2s Time] [2021-12-14 13:51:27,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-12-14 13:51:27,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 50. [2021-12-14 13:51:27,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 49 states have internal predecessors, (52), 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) [2021-12-14 13:51:27,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2021-12-14 13:51:27,814 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 42 [2021-12-14 13:51:27,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:27,814 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2021-12-14 13:51:27,814 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.6296296296296298) internal successors, (71), 27 states have internal predecessors, (71), 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) [2021-12-14 13:51:27,814 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2021-12-14 13:51:27,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-12-14 13:51:27,814 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:27,815 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:27,831 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2021-12-14 13:51:28,027 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:28,027 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:28,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:28,028 INFO L85 PathProgramCache]: Analyzing trace with hash -396306831, now seen corresponding path program 14 times [2021-12-14 13:51:28,028 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:28,028 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1923517407] [2021-12-14 13:51:28,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:28,028 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:28,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:28,280 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 114 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:28,281 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:28,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1923517407] [2021-12-14 13:51:28,281 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1923517407] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:28,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1754411031] [2021-12-14 13:51:28,281 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-14 13:51:28,281 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:28,281 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:28,300 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) [2021-12-14 13:51:28,301 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-12-14 13:51:28,350 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-14 13:51:28,351 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:51:28,352 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 39 conjunts are in the unsatisfiable core [2021-12-14 13:51:28,353 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:28,388 INFO L388 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 15 treesize of output 11 [2021-12-14 13:51:28,411 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-12-14 13:51:28,412 INFO L388 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 25 treesize of output 24 [2021-12-14 13:51:28,448 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-12-14 13:51:28,449 INFO L388 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 25 treesize of output 24 [2021-12-14 13:51:28,595 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 1 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:28,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:28,761 INFO L388 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 16 treesize of output 14 [2021-12-14 13:51:28,762 INFO L388 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 24 [2021-12-14 13:51:28,817 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-14 13:51:28,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1754411031] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:28,818 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:28,818 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 28 [2021-12-14 13:51:28,818 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063329811] [2021-12-14 13:51:28,818 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:28,818 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-12-14 13:51:28,818 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:28,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-12-14 13:51:28,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2021-12-14 13:51:28,819 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand has 28 states, 28 states have (on average 2.6785714285714284) internal successors, (75), 28 states have internal predecessors, (75), 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) [2021-12-14 13:51:29,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:29,168 INFO L93 Difference]: Finished difference Result 77 states and 79 transitions. [2021-12-14 13:51:29,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-12-14 13:51:29,169 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.6785714285714284) internal successors, (75), 28 states have internal predecessors, (75), 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 44 [2021-12-14 13:51:29,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:29,169 INFO L225 Difference]: With dead ends: 77 [2021-12-14 13:51:29,169 INFO L226 Difference]: Without dead ends: 75 [2021-12-14 13:51:29,170 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 72 SyntacticMatches, 8 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 304 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=226, Invalid=1496, Unknown=0, NotChecked=0, Total=1722 [2021-12-14 13:51:29,171 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 74 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 646 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 236 SdHoareTripleChecker+Invalid, 704 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 646 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:29,171 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 236 Invalid, 704 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 646 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-14 13:51:29,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-12-14 13:51:29,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 47. [2021-12-14 13:51:29,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 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) [2021-12-14 13:51:29,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2021-12-14 13:51:29,202 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 44 [2021-12-14 13:51:29,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:29,202 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2021-12-14 13:51:29,203 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.6785714285714284) internal successors, (75), 28 states have internal predecessors, (75), 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) [2021-12-14 13:51:29,203 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2021-12-14 13:51:29,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-12-14 13:51:29,204 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:29,205 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:29,224 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-12-14 13:51:29,407 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,SelfDestructingSolverStorable16 [2021-12-14 13:51:29,408 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:29,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:29,415 INFO L85 PathProgramCache]: Analyzing trace with hash -1870665559, now seen corresponding path program 15 times [2021-12-14 13:51:29,415 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:29,415 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2084590389] [2021-12-14 13:51:29,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:29,415 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:29,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:29,613 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:29,613 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:29,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2084590389] [2021-12-14 13:51:29,614 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2084590389] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:29,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1542394264] [2021-12-14 13:51:29,614 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-14 13:51:29,614 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:29,614 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:29,627 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) [2021-12-14 13:51:29,628 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-12-14 13:51:29,729 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-12-14 13:51:29,729 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:51:29,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 26 conjunts are in the unsatisfiable core [2021-12-14 13:51:29,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:29,853 INFO L388 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 15 treesize of output 11 [2021-12-14 13:51:30,348 INFO L354 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-12-14 13:51:30,349 INFO L388 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 44 treesize of output 23 [2021-12-14 13:51:30,370 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:30,370 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:30,888 INFO L388 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 18 treesize of output 16 [2021-12-14 13:51:30,890 INFO L388 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 28 [2021-12-14 13:51:30,911 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 60 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:30,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1542394264] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:30,912 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:30,912 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 20, 20] total 47 [2021-12-14 13:51:30,912 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077738464] [2021-12-14 13:51:30,912 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:30,912 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-12-14 13:51:30,912 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:30,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-12-14 13:51:30,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=261, Invalid=1901, Unknown=0, NotChecked=0, Total=2162 [2021-12-14 13:51:30,913 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand has 47 states, 47 states have (on average 2.5106382978723403) internal successors, (118), 47 states have internal predecessors, (118), 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) [2021-12-14 13:51:31,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:31,550 INFO L93 Difference]: Finished difference Result 81 states and 83 transitions. [2021-12-14 13:51:31,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-12-14 13:51:31,551 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.5106382978723403) internal successors, (118), 47 states have internal predecessors, (118), 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 46 [2021-12-14 13:51:31,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:31,552 INFO L225 Difference]: With dead ends: 81 [2021-12-14 13:51:31,552 INFO L226 Difference]: Without dead ends: 49 [2021-12-14 13:51:31,553 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1085 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=631, Invalid=5069, Unknown=0, NotChecked=0, Total=5700 [2021-12-14 13:51:31,553 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 32 mSDsluCounter, 264 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 284 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 135 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:31,554 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 284 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 131 Invalid, 0 Unknown, 135 Unchecked, 0.0s Time] [2021-12-14 13:51:31,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-12-14 13:51:31,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-12-14 13:51:31,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.0416666666666667) internal successors, (50), 48 states have internal predecessors, (50), 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) [2021-12-14 13:51:31,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2021-12-14 13:51:31,559 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 46 [2021-12-14 13:51:31,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:31,560 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2021-12-14 13:51:31,560 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.5106382978723403) internal successors, (118), 47 states have internal predecessors, (118), 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) [2021-12-14 13:51:31,560 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2021-12-14 13:51:31,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-12-14 13:51:31,560 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:31,560 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:31,577 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2021-12-14 13:51:31,763 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-12-14 13:51:31,764 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:31,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:31,764 INFO L85 PathProgramCache]: Analyzing trace with hash -1892776313, now seen corresponding path program 16 times [2021-12-14 13:51:31,764 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:31,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [990441617] [2021-12-14 13:51:31,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:31,765 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:31,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:31,986 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:31,987 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:31,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [990441617] [2021-12-14 13:51:31,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [990441617] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:31,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [453074557] [2021-12-14 13:51:31,987 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-14 13:51:31,987 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:31,987 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:31,996 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:51:31,998 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-12-14 13:51:32,064 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-14 13:51:32,065 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:51:32,066 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 40 conjunts are in the unsatisfiable core [2021-12-14 13:51:32,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:32,116 INFO L388 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 15 treesize of output 11 [2021-12-14 13:51:32,162 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-12-14 13:51:32,162 INFO L388 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 27 treesize of output 26 [2021-12-14 13:51:32,393 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:32,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:32,534 INFO L388 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 16 treesize of output 14 [2021-12-14 13:51:32,536 INFO L388 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 24 [2021-12-14 13:51:32,581 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:32,582 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [453074557] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:32,582 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:32,582 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 30 [2021-12-14 13:51:32,582 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [233008909] [2021-12-14 13:51:32,582 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:32,582 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-12-14 13:51:32,582 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:32,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-12-14 13:51:32,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=790, Unknown=0, NotChecked=0, Total=870 [2021-12-14 13:51:32,583 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand has 30 states, 30 states have (on average 2.7) internal successors, (81), 30 states have internal predecessors, (81), 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) [2021-12-14 13:51:32,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:32,942 INFO L93 Difference]: Finished difference Result 89 states and 91 transitions. [2021-12-14 13:51:32,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-12-14 13:51:32,942 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.7) internal successors, (81), 30 states have internal predecessors, (81), 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 48 [2021-12-14 13:51:32,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:32,943 INFO L225 Difference]: With dead ends: 89 [2021-12-14 13:51:32,943 INFO L226 Difference]: Without dead ends: 87 [2021-12-14 13:51:32,943 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 80 SyntacticMatches, 6 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=149, Invalid=1411, Unknown=0, NotChecked=0, Total=1560 [2021-12-14 13:51:32,944 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 29 mSDsluCounter, 409 mSDsCounter, 0 mSdLazyCounter, 701 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 431 SdHoareTripleChecker+Invalid, 743 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 701 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 20 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:32,944 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 431 Invalid, 743 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 701 Invalid, 0 Unknown, 20 Unchecked, 0.2s Time] [2021-12-14 13:51:32,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-12-14 13:51:32,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 56. [2021-12-14 13:51:32,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.0545454545454545) internal successors, (58), 55 states have internal predecessors, (58), 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) [2021-12-14 13:51:32,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2021-12-14 13:51:32,948 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 48 [2021-12-14 13:51:32,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:32,949 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2021-12-14 13:51:32,949 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.7) internal successors, (81), 30 states have internal predecessors, (81), 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) [2021-12-14 13:51:32,949 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2021-12-14 13:51:32,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-12-14 13:51:32,949 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:32,949 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:32,968 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-12-14 13:51:33,159 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:33,160 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:33,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:33,160 INFO L85 PathProgramCache]: Analyzing trace with hash -1666374427, now seen corresponding path program 17 times [2021-12-14 13:51:33,160 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:33,160 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1396426479] [2021-12-14 13:51:33,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:33,160 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:33,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:33,401 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:33,401 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:33,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1396426479] [2021-12-14 13:51:33,401 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1396426479] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:33,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1781937926] [2021-12-14 13:51:33,402 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-14 13:51:33,402 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:33,402 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:33,403 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:51:33,404 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-12-14 13:51:33,484 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-12-14 13:51:33,484 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:51:33,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 43 conjunts are in the unsatisfiable core [2021-12-14 13:51:33,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:33,521 INFO L388 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 15 treesize of output 11 [2021-12-14 13:51:33,550 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-12-14 13:51:33,550 INFO L388 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 25 treesize of output 24 [2021-12-14 13:51:33,581 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-12-14 13:51:33,582 INFO L388 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 25 treesize of output 24 [2021-12-14 13:51:33,813 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 1 proven. 152 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:33,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:33,988 INFO L388 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 16 treesize of output 14 [2021-12-14 13:51:33,990 INFO L388 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 24 [2021-12-14 13:51:34,037 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 152 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-14 13:51:34,037 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1781937926] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:34,038 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:34,038 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 31 [2021-12-14 13:51:34,038 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570315435] [2021-12-14 13:51:34,038 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:34,038 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-12-14 13:51:34,038 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:34,038 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-12-14 13:51:34,038 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2021-12-14 13:51:34,039 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand has 31 states, 31 states have (on average 2.7419354838709675) internal successors, (85), 31 states have internal predecessors, (85), 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) [2021-12-14 13:51:34,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:34,490 INFO L93 Difference]: Finished difference Result 87 states and 89 transitions. [2021-12-14 13:51:34,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-12-14 13:51:34,491 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.7419354838709675) internal successors, (85), 31 states have internal predecessors, (85), 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 50 [2021-12-14 13:51:34,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:34,491 INFO L225 Difference]: With dead ends: 87 [2021-12-14 13:51:34,491 INFO L226 Difference]: Without dead ends: 85 [2021-12-14 13:51:34,492 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 83 SyntacticMatches, 8 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 378 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=255, Invalid=1907, Unknown=0, NotChecked=0, Total=2162 [2021-12-14 13:51:34,492 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 59 mSDsluCounter, 266 mSDsCounter, 0 mSdLazyCounter, 750 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 285 SdHoareTripleChecker+Invalid, 801 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 750 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:34,492 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 285 Invalid, 801 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 750 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-14 13:51:34,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-12-14 13:51:34,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 53. [2021-12-14 13:51:34,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.0384615384615385) internal successors, (54), 52 states have internal predecessors, (54), 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) [2021-12-14 13:51:34,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2021-12-14 13:51:34,497 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 50 [2021-12-14 13:51:34,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:34,498 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2021-12-14 13:51:34,498 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.7419354838709675) internal successors, (85), 31 states have internal predecessors, (85), 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) [2021-12-14 13:51:34,498 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2021-12-14 13:51:34,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-12-14 13:51:34,498 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:34,498 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:34,515 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-12-14 13:51:34,714 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:34,715 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:34,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:34,715 INFO L85 PathProgramCache]: Analyzing trace with hash -1193657443, now seen corresponding path program 18 times [2021-12-14 13:51:34,715 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:34,715 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2078751484] [2021-12-14 13:51:34,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:34,715 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:34,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:34,941 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:34,942 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:34,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2078751484] [2021-12-14 13:51:34,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2078751484] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:34,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [623246867] [2021-12-14 13:51:34,942 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-14 13:51:34,942 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:34,942 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:34,943 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:51:34,949 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-12-14 13:51:35,028 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-12-14 13:51:35,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:51:35,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 28 conjunts are in the unsatisfiable core [2021-12-14 13:51:35,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:35,247 INFO L388 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 15 treesize of output 11 [2021-12-14 13:51:35,817 INFO L354 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-12-14 13:51:35,817 INFO L388 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 44 treesize of output 23 [2021-12-14 13:51:35,840 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 91 proven. 71 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:35,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:36,455 INFO L388 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 18 treesize of output 16 [2021-12-14 13:51:36,457 INFO L388 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 28 [2021-12-14 13:51:36,484 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 84 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:36,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [623246867] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:36,484 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:36,484 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 22, 22] total 52 [2021-12-14 13:51:36,485 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181165866] [2021-12-14 13:51:36,485 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:36,485 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-12-14 13:51:36,485 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:36,485 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-12-14 13:51:36,486 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=313, Invalid=2339, Unknown=0, NotChecked=0, Total=2652 [2021-12-14 13:51:36,486 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand has 52 states, 52 states have (on average 2.576923076923077) internal successors, (134), 52 states have internal predecessors, (134), 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) [2021-12-14 13:51:37,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:37,212 INFO L93 Difference]: Finished difference Result 91 states and 93 transitions. [2021-12-14 13:51:37,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-12-14 13:51:37,213 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.576923076923077) internal successors, (134), 52 states have internal predecessors, (134), 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 52 [2021-12-14 13:51:37,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:37,214 INFO L225 Difference]: With dead ends: 91 [2021-12-14 13:51:37,214 INFO L226 Difference]: Without dead ends: 55 [2021-12-14 13:51:37,215 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 82 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1314 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=737, Invalid=6235, Unknown=0, NotChecked=0, Total=6972 [2021-12-14 13:51:37,218 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 41 mSDsluCounter, 305 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 328 SdHoareTripleChecker+Invalid, 360 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 137 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:37,219 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 328 Invalid, 360 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 219 Invalid, 0 Unknown, 137 Unchecked, 0.1s Time] [2021-12-14 13:51:37,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-12-14 13:51:37,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-12-14 13:51:37,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.037037037037037) internal successors, (56), 54 states have internal predecessors, (56), 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) [2021-12-14 13:51:37,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2021-12-14 13:51:37,225 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 52 [2021-12-14 13:51:37,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:37,226 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2021-12-14 13:51:37,226 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.576923076923077) internal successors, (134), 52 states have internal predecessors, (134), 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) [2021-12-14 13:51:37,226 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2021-12-14 13:51:37,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-12-14 13:51:37,227 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:37,227 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:37,246 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-12-14 13:51:37,447 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:37,447 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:37,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:37,447 INFO L85 PathProgramCache]: Analyzing trace with hash -1895400709, now seen corresponding path program 19 times [2021-12-14 13:51:37,448 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:37,448 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [814596618] [2021-12-14 13:51:37,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:37,448 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:37,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:37,684 INFO L134 CoverageAnalysis]: Checked inductivity of 179 backedges. 0 proven. 179 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:37,684 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:37,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [814596618] [2021-12-14 13:51:37,685 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [814596618] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:37,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1783241777] [2021-12-14 13:51:37,685 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-14 13:51:37,685 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:37,685 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:37,686 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:51:37,687 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-12-14 13:51:37,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:37,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 44 conjunts are in the unsatisfiable core [2021-12-14 13:51:37,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:37,828 INFO L388 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 15 treesize of output 11 [2021-12-14 13:51:37,872 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-12-14 13:51:37,872 INFO L388 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 27 treesize of output 26 [2021-12-14 13:51:38,143 INFO L134 CoverageAnalysis]: Checked inductivity of 179 backedges. 0 proven. 179 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:38,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:38,284 INFO L388 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 16 treesize of output 14 [2021-12-14 13:51:38,286 INFO L388 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 24 [2021-12-14 13:51:38,339 INFO L134 CoverageAnalysis]: Checked inductivity of 179 backedges. 0 proven. 179 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:38,339 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1783241777] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:38,339 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:38,339 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 33 [2021-12-14 13:51:38,339 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2062545542] [2021-12-14 13:51:38,339 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:38,340 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-12-14 13:51:38,340 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:38,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-12-14 13:51:38,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=968, Unknown=0, NotChecked=0, Total=1056 [2021-12-14 13:51:38,340 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand has 33 states, 33 states have (on average 2.757575757575758) internal successors, (91), 33 states have internal predecessors, (91), 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) [2021-12-14 13:51:38,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:38,778 INFO L93 Difference]: Finished difference Result 99 states and 101 transitions. [2021-12-14 13:51:38,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-12-14 13:51:38,779 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.757575757575758) internal successors, (91), 33 states have internal predecessors, (91), 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 54 [2021-12-14 13:51:38,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:38,779 INFO L225 Difference]: With dead ends: 99 [2021-12-14 13:51:38,779 INFO L226 Difference]: Without dead ends: 97 [2021-12-14 13:51:38,780 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 91 SyntacticMatches, 6 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 274 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=164, Invalid=1728, Unknown=0, NotChecked=0, Total=1892 [2021-12-14 13:51:38,780 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 29 mSDsluCounter, 472 mSDsCounter, 0 mSdLazyCounter, 915 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 496 SdHoareTripleChecker+Invalid, 939 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 915 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:38,780 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 496 Invalid, 939 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 915 Invalid, 0 Unknown, 1 Unchecked, 0.3s Time] [2021-12-14 13:51:38,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-12-14 13:51:38,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 62. [2021-12-14 13:51:38,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 61 states have (on average 1.0491803278688525) internal successors, (64), 61 states have internal predecessors, (64), 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) [2021-12-14 13:51:38,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2021-12-14 13:51:38,786 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 54 [2021-12-14 13:51:38,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:38,787 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2021-12-14 13:51:38,787 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.757575757575758) internal successors, (91), 33 states have internal predecessors, (91), 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) [2021-12-14 13:51:38,787 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2021-12-14 13:51:38,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-12-14 13:51:38,787 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:38,787 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:38,804 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2021-12-14 13:51:38,999 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-12-14 13:51:38,999 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:38,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:39,000 INFO L85 PathProgramCache]: Analyzing trace with hash -1960813863, now seen corresponding path program 20 times [2021-12-14 13:51:39,000 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:39,000 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1348252051] [2021-12-14 13:51:39,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:39,000 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:39,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:39,249 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:39,249 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:39,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1348252051] [2021-12-14 13:51:39,249 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1348252051] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:39,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [233961806] [2021-12-14 13:51:39,250 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-14 13:51:39,250 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:39,250 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:39,251 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:51:39,252 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-12-14 13:51:39,324 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-14 13:51:39,325 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:51:39,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 49 conjunts are in the unsatisfiable core [2021-12-14 13:51:39,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:39,375 INFO L388 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 15 treesize of output 11 [2021-12-14 13:51:39,409 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-12-14 13:51:39,409 INFO L388 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 25 treesize of output 24 [2021-12-14 13:51:39,480 INFO L354 Elim1Store]: treesize reduction 80, result has 20.8 percent of original size [2021-12-14 13:51:39,481 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 36 treesize of output 38 [2021-12-14 13:51:40,309 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 1 proven. 197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:40,310 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:40,900 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_main_~i~0#1_239| Int)) (or (< |v_ULTIMATE.start_main_~i~0#1_239| (+ |c_ULTIMATE.start_main_~i~0#1| 1)) (and (= (select (store (select |c_#memory_int| |c_ULTIMATE.start_main_~x~0#1.base|) (+ (* |v_ULTIMATE.start_main_~i~0#1_239| 4) |c_ULTIMATE.start_main_~x~0#1.offset|) 0) (+ 28 |c_ULTIMATE.start_main_~x~0#1.offset|)) 0) (< 6 |v_ULTIMATE.start_main_~i~0#1_239|)))) is different from false [2021-12-14 13:51:40,905 INFO L388 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 27 treesize of output 25 [2021-12-14 13:51:40,907 INFO L388 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 53 treesize of output 49 [2021-12-14 13:51:40,954 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 189 refuted. 0 times theorem prover too weak. 0 trivial. 9 not checked. [2021-12-14 13:51:40,955 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [233961806] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:40,955 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:40,955 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 24, 24] total 39 [2021-12-14 13:51:40,955 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143077804] [2021-12-14 13:51:40,955 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:40,955 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-12-14 13:51:40,955 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:40,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-12-14 13:51:40,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1280, Unknown=2, NotChecked=72, Total=1482 [2021-12-14 13:51:40,956 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand has 39 states, 39 states have (on average 2.6153846153846154) internal successors, (102), 39 states have internal predecessors, (102), 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) [2021-12-14 13:51:41,388 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((|v_ULTIMATE.start_main_~i~0#1_239| Int)) (or (< |v_ULTIMATE.start_main_~i~0#1_239| (+ |c_ULTIMATE.start_main_~i~0#1| 1)) (and (= (select (store (select |c_#memory_int| |c_ULTIMATE.start_main_~x~0#1.base|) (+ (* |v_ULTIMATE.start_main_~i~0#1_239| 4) |c_ULTIMATE.start_main_~x~0#1.offset|) 0) (+ 28 |c_ULTIMATE.start_main_~x~0#1.offset|)) 0) (< 6 |v_ULTIMATE.start_main_~i~0#1_239|)))) (<= 7 |c_ULTIMATE.start_main_~i~0#1|) (= (select (select |c_#memory_int| |c_ULTIMATE.start_main_~x~0#1.base|) (+ (* |c_ULTIMATE.start_main_~i~0#1| 4) |c_ULTIMATE.start_main_~x~0#1.offset|)) 0) (<= |c_ULTIMATE.start_main_~i~0#1| 7)) is different from false [2021-12-14 13:51:41,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:41,431 INFO L93 Difference]: Finished difference Result 97 states and 99 transitions. [2021-12-14 13:51:41,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-12-14 13:51:41,432 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.6153846153846154) internal successors, (102), 39 states have internal predecessors, (102), 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 56 [2021-12-14 13:51:41,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:41,432 INFO L225 Difference]: With dead ends: 97 [2021-12-14 13:51:41,432 INFO L226 Difference]: Without dead ends: 95 [2021-12-14 13:51:41,433 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 91 SyntacticMatches, 6 SemanticMatches, 38 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 228 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=130, Invalid=1281, Unknown=3, NotChecked=146, Total=1560 [2021-12-14 13:51:41,437 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 35 mSDsluCounter, 471 mSDsCounter, 0 mSdLazyCounter, 400 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 494 SdHoareTripleChecker+Invalid, 493 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 400 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 89 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:41,437 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 494 Invalid, 493 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 400 Invalid, 0 Unknown, 89 Unchecked, 0.1s Time] [2021-12-14 13:51:41,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-12-14 13:51:41,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 59. [2021-12-14 13:51:41,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 58 states have internal predecessors, (60), 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) [2021-12-14 13:51:41,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2021-12-14 13:51:41,444 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 56 [2021-12-14 13:51:41,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:41,444 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2021-12-14 13:51:41,445 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.6153846153846154) internal successors, (102), 39 states have internal predecessors, (102), 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) [2021-12-14 13:51:41,445 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2021-12-14 13:51:41,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-12-14 13:51:41,445 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:41,445 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:41,462 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2021-12-14 13:51:41,662 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-12-14 13:51:41,663 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:41,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:41,664 INFO L85 PathProgramCache]: Analyzing trace with hash 1778046481, now seen corresponding path program 21 times [2021-12-14 13:51:41,664 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:41,664 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [553349989] [2021-12-14 13:51:41,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:41,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:41,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:41,883 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 0 proven. 209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:41,883 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:41,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [553349989] [2021-12-14 13:51:41,883 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [553349989] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:41,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1019572106] [2021-12-14 13:51:41,883 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-14 13:51:41,884 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:41,884 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:41,885 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:51:41,886 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-12-14 13:51:41,973 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-12-14 13:51:41,974 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:51:41,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 30 conjunts are in the unsatisfiable core [2021-12-14 13:51:41,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:42,144 INFO L388 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 15 treesize of output 11 [2021-12-14 13:51:42,797 INFO L354 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-12-14 13:51:42,797 INFO L388 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 44 treesize of output 23 [2021-12-14 13:51:42,823 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 120 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:42,823 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:43,750 INFO L388 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 18 treesize of output 16 [2021-12-14 13:51:43,752 INFO L388 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 28 [2021-12-14 13:51:43,780 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 112 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:43,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1019572106] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:43,781 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:43,781 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 24, 24] total 57 [2021-12-14 13:51:43,781 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638587014] [2021-12-14 13:51:43,781 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:43,781 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-12-14 13:51:43,781 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:43,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-12-14 13:51:43,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=2821, Unknown=1, NotChecked=0, Total=3192 [2021-12-14 13:51:43,782 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand has 57 states, 57 states have (on average 2.6315789473684212) internal successors, (150), 57 states have internal predecessors, (150), 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) [2021-12-14 13:51:44,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:44,600 INFO L93 Difference]: Finished difference Result 101 states and 103 transitions. [2021-12-14 13:51:44,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-12-14 13:51:44,600 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.6315789473684212) internal successors, (150), 57 states have internal predecessors, (150), 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 58 [2021-12-14 13:51:44,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:44,601 INFO L225 Difference]: With dead ends: 101 [2021-12-14 13:51:44,601 INFO L226 Difference]: Without dead ends: 61 [2021-12-14 13:51:44,602 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1603 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=875, Invalid=7680, Unknown=1, NotChecked=0, Total=8556 [2021-12-14 13:51:44,603 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 26 mSDsluCounter, 371 mSDsCounter, 0 mSdLazyCounter, 259 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 396 SdHoareTripleChecker+Invalid, 415 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 259 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 151 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:44,603 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 396 Invalid, 415 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 259 Invalid, 0 Unknown, 151 Unchecked, 0.1s Time] [2021-12-14 13:51:44,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-12-14 13:51:44,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-12-14 13:51:44,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.0333333333333334) internal successors, (62), 60 states have internal predecessors, (62), 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) [2021-12-14 13:51:44,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2021-12-14 13:51:44,611 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 58 [2021-12-14 13:51:44,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:44,611 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2021-12-14 13:51:44,611 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 2.6315789473684212) internal successors, (150), 57 states have internal predecessors, (150), 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) [2021-12-14 13:51:44,611 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2021-12-14 13:51:44,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-12-14 13:51:44,612 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:44,612 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:44,629 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-12-14 13:51:44,829 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:44,829 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:44,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:44,830 INFO L85 PathProgramCache]: Analyzing trace with hash 71669487, now seen corresponding path program 22 times [2021-12-14 13:51:44,830 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:44,830 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1372547364] [2021-12-14 13:51:44,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:44,830 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:44,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:45,117 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 0 proven. 228 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:45,117 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:45,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1372547364] [2021-12-14 13:51:45,117 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1372547364] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:45,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1241322275] [2021-12-14 13:51:45,117 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-14 13:51:45,117 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:45,117 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:45,118 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:51:45,119 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-12-14 13:51:45,392 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-14 13:51:45,392 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:51:45,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 48 conjunts are in the unsatisfiable core [2021-12-14 13:51:45,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:45,455 INFO L388 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 15 treesize of output 11 [2021-12-14 13:51:45,504 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-12-14 13:51:45,504 INFO L388 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 27 treesize of output 26 [2021-12-14 13:51:45,824 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 0 proven. 228 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:45,824 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:45,991 INFO L388 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 16 treesize of output 14 [2021-12-14 13:51:45,993 INFO L388 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 24 [2021-12-14 13:51:46,052 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 0 proven. 228 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:46,052 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1241322275] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:46,052 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:46,052 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 36 [2021-12-14 13:51:46,052 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045405451] [2021-12-14 13:51:46,052 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:46,052 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-12-14 13:51:46,053 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:46,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-12-14 13:51:46,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1164, Unknown=0, NotChecked=0, Total=1260 [2021-12-14 13:51:46,053 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand has 36 states, 36 states have (on average 2.8055555555555554) internal successors, (101), 36 states have internal predecessors, (101), 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) [2021-12-14 13:51:46,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:46,601 INFO L93 Difference]: Finished difference Result 109 states and 111 transitions. [2021-12-14 13:51:46,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-12-14 13:51:46,602 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.8055555555555554) internal successors, (101), 36 states have internal predecessors, (101), 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 60 [2021-12-14 13:51:46,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:46,602 INFO L225 Difference]: With dead ends: 109 [2021-12-14 13:51:46,602 INFO L226 Difference]: Without dead ends: 107 [2021-12-14 13:51:46,603 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 102 SyntacticMatches, 6 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 322 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=179, Invalid=2077, Unknown=0, NotChecked=0, Total=2256 [2021-12-14 13:51:46,603 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 33 mSDsluCounter, 539 mSDsCounter, 0 mSdLazyCounter, 985 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 565 SdHoareTripleChecker+Invalid, 1054 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 985 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 43 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:46,603 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 565 Invalid, 1054 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 985 Invalid, 0 Unknown, 43 Unchecked, 0.4s Time] [2021-12-14 13:51:46,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-12-14 13:51:46,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 68. [2021-12-14 13:51:46,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.044776119402985) internal successors, (70), 67 states have internal predecessors, (70), 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) [2021-12-14 13:51:46,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2021-12-14 13:51:46,611 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 60 [2021-12-14 13:51:46,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:46,611 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2021-12-14 13:51:46,611 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.8055555555555554) internal successors, (101), 36 states have internal predecessors, (101), 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) [2021-12-14 13:51:46,611 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2021-12-14 13:51:46,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-12-14 13:51:46,612 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:46,612 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:46,630 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2021-12-14 13:51:46,829 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:46,830 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:46,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:46,830 INFO L85 PathProgramCache]: Analyzing trace with hash 920885325, now seen corresponding path program 23 times [2021-12-14 13:51:46,830 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:46,830 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1181646232] [2021-12-14 13:51:46,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:46,830 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:46,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:47,126 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 0 proven. 249 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:47,127 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:47,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1181646232] [2021-12-14 13:51:47,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1181646232] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:47,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [267684951] [2021-12-14 13:51:47,127 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-14 13:51:47,127 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:47,127 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:47,128 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:51:47,130 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-12-14 13:51:47,276 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-12-14 13:51:47,276 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:51:47,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 51 conjunts are in the unsatisfiable core [2021-12-14 13:51:47,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:47,342 INFO L388 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 15 treesize of output 11 [2021-12-14 13:51:47,376 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-12-14 13:51:47,376 INFO L388 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 25 treesize of output 24 [2021-12-14 13:51:47,410 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-12-14 13:51:47,410 INFO L388 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 25 treesize of output 24 [2021-12-14 13:51:47,696 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 1 proven. 248 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:47,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:47,830 INFO L388 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 16 treesize of output 14 [2021-12-14 13:51:47,832 INFO L388 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 24 [2021-12-14 13:51:47,865 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 0 proven. 248 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-14 13:51:47,866 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [267684951] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:47,866 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:47,866 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 37 [2021-12-14 13:51:47,866 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145861255] [2021-12-14 13:51:47,866 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:47,866 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-12-14 13:51:47,866 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:47,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-12-14 13:51:47,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1230, Unknown=0, NotChecked=0, Total=1332 [2021-12-14 13:51:47,868 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand has 37 states, 37 states have (on average 2.8378378378378377) internal successors, (105), 37 states have internal predecessors, (105), 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) [2021-12-14 13:51:48,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:48,384 INFO L93 Difference]: Finished difference Result 107 states and 109 transitions. [2021-12-14 13:51:48,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-12-14 13:51:48,385 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.8378378378378377) internal successors, (105), 37 states have internal predecessors, (105), 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 62 [2021-12-14 13:51:48,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:48,385 INFO L225 Difference]: With dead ends: 107 [2021-12-14 13:51:48,385 INFO L226 Difference]: Without dead ends: 105 [2021-12-14 13:51:48,386 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 105 SyntacticMatches, 8 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 553 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=313, Invalid=2879, Unknown=0, NotChecked=0, Total=3192 [2021-12-14 13:51:48,386 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 69 mSDsluCounter, 445 mSDsCounter, 0 mSdLazyCounter, 1168 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 468 SdHoareTripleChecker+Invalid, 1231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 1168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:48,386 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 468 Invalid, 1231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 1168 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-14 13:51:48,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-12-14 13:51:48,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 65. [2021-12-14 13:51:48,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.03125) internal successors, (66), 64 states have internal predecessors, (66), 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) [2021-12-14 13:51:48,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 66 transitions. [2021-12-14 13:51:48,410 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 66 transitions. Word has length 62 [2021-12-14 13:51:48,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:48,410 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 66 transitions. [2021-12-14 13:51:48,411 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.8378378378378377) internal successors, (105), 37 states have internal predecessors, (105), 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) [2021-12-14 13:51:48,411 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 66 transitions. [2021-12-14 13:51:48,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-12-14 13:51:48,411 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:48,411 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:48,430 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-12-14 13:51:48,619 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-12-14 13:51:48,619 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:48,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:48,620 INFO L85 PathProgramCache]: Analyzing trace with hash -1314727931, now seen corresponding path program 24 times [2021-12-14 13:51:48,620 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:48,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [479042379] [2021-12-14 13:51:48,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:48,620 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:48,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:48,904 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 0 proven. 262 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:48,904 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:48,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [479042379] [2021-12-14 13:51:48,904 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [479042379] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:48,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1072016609] [2021-12-14 13:51:48,904 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-14 13:51:48,904 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:48,905 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:48,906 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:51:48,906 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-12-14 13:51:49,011 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2021-12-14 13:51:49,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:51:49,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 32 conjunts are in the unsatisfiable core [2021-12-14 13:51:49,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:49,176 INFO L388 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 15 treesize of output 11 [2021-12-14 13:51:49,800 INFO L354 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-12-14 13:51:49,800 INFO L388 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 44 treesize of output 23 [2021-12-14 13:51:49,827 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 153 proven. 109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:49,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:50,648 INFO L388 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 18 treesize of output 16 [2021-12-14 13:51:50,650 INFO L388 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 28 [2021-12-14 13:51:50,680 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 144 proven. 118 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:50,680 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1072016609] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:50,680 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:50,680 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 26, 26] total 62 [2021-12-14 13:51:50,681 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512396613] [2021-12-14 13:51:50,681 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:50,681 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-12-14 13:51:50,681 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:50,681 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-12-14 13:51:50,681 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=432, Invalid=3350, Unknown=0, NotChecked=0, Total=3782 [2021-12-14 13:51:50,682 INFO L87 Difference]: Start difference. First operand 65 states and 66 transitions. Second operand has 62 states, 62 states have (on average 2.6774193548387095) internal successors, (166), 62 states have internal predecessors, (166), 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) [2021-12-14 13:51:51,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:51,498 INFO L93 Difference]: Finished difference Result 111 states and 113 transitions. [2021-12-14 13:51:51,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-12-14 13:51:51,498 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.6774193548387095) internal successors, (166), 62 states have internal predecessors, (166), 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 64 [2021-12-14 13:51:51,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:51,499 INFO L225 Difference]: With dead ends: 111 [2021-12-14 13:51:51,499 INFO L226 Difference]: Without dead ends: 67 [2021-12-14 13:51:51,500 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 109 SyntacticMatches, 1 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1544 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=853, Invalid=7703, Unknown=0, NotChecked=0, Total=8556 [2021-12-14 13:51:51,501 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 24 mSDsluCounter, 437 mSDsCounter, 0 mSdLazyCounter, 234 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 461 SdHoareTripleChecker+Invalid, 304 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 234 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 66 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:51,501 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 461 Invalid, 304 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 234 Invalid, 0 Unknown, 66 Unchecked, 0.1s Time] [2021-12-14 13:51:51,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-12-14 13:51:51,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2021-12-14 13:51:51,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 states have internal predecessors, (68), 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) [2021-12-14 13:51:51,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2021-12-14 13:51:51,511 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 64 [2021-12-14 13:51:51,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:51,511 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2021-12-14 13:51:51,512 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 2.6774193548387095) internal successors, (166), 62 states have internal predecessors, (166), 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) [2021-12-14 13:51:51,512 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2021-12-14 13:51:51,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-12-14 13:51:51,512 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:51,512 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:51,528 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-12-14 13:51:51,727 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-12-14 13:51:51,728 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:51,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:51,728 INFO L85 PathProgramCache]: Analyzing trace with hash 2021980771, now seen corresponding path program 25 times [2021-12-14 13:51:51,728 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:51,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1528928050] [2021-12-14 13:51:51,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:51,728 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:51,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:52,075 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 0 proven. 283 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:52,075 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:52,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1528928050] [2021-12-14 13:51:52,076 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1528928050] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:52,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [410012272] [2021-12-14 13:51:52,076 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-14 13:51:52,076 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:52,076 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:52,077 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:51:52,106 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-12-14 13:51:52,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:52,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 52 conjunts are in the unsatisfiable core [2021-12-14 13:51:52,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:52,209 INFO L388 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 15 treesize of output 11 [2021-12-14 13:51:52,272 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-12-14 13:51:52,272 INFO L388 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 27 treesize of output 26 [2021-12-14 13:51:52,564 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 0 proven. 283 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:52,564 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:52,675 INFO L388 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 16 treesize of output 14 [2021-12-14 13:51:52,676 INFO L388 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 24 [2021-12-14 13:51:52,717 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 0 proven. 283 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:52,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [410012272] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:52,717 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:52,717 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 39 [2021-12-14 13:51:52,718 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [602302626] [2021-12-14 13:51:52,718 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:52,718 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-12-14 13:51:52,718 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:52,718 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-12-14 13:51:52,718 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1378, Unknown=0, NotChecked=0, Total=1482 [2021-12-14 13:51:52,719 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand has 39 states, 39 states have (on average 2.8461538461538463) internal successors, (111), 39 states have internal predecessors, (111), 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) [2021-12-14 13:51:53,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:53,200 INFO L93 Difference]: Finished difference Result 119 states and 121 transitions. [2021-12-14 13:51:53,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-12-14 13:51:53,200 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.8461538461538463) internal successors, (111), 39 states have internal predecessors, (111), 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 66 [2021-12-14 13:51:53,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:53,201 INFO L225 Difference]: With dead ends: 119 [2021-12-14 13:51:53,201 INFO L226 Difference]: Without dead ends: 117 [2021-12-14 13:51:53,202 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 113 SyntacticMatches, 6 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=194, Invalid=2458, Unknown=0, NotChecked=0, Total=2652 [2021-12-14 13:51:53,202 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 35 mSDsluCounter, 630 mSDsCounter, 0 mSdLazyCounter, 1124 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 658 SdHoareTripleChecker+Invalid, 1178 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 1124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 26 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:53,202 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 658 Invalid, 1178 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 1124 Invalid, 0 Unknown, 26 Unchecked, 0.3s Time] [2021-12-14 13:51:53,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-12-14 13:51:53,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 74. [2021-12-14 13:51:53,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.0410958904109588) internal successors, (76), 73 states have internal predecessors, (76), 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) [2021-12-14 13:51:53,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2021-12-14 13:51:53,213 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 66 [2021-12-14 13:51:53,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:53,213 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2021-12-14 13:51:53,213 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.8461538461538463) internal successors, (111), 39 states have internal predecessors, (111), 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) [2021-12-14 13:51:53,213 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2021-12-14 13:51:53,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-12-14 13:51:53,214 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:53,214 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:53,230 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2021-12-14 13:51:53,430 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-12-14 13:51:53,430 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:53,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:53,431 INFO L85 PathProgramCache]: Analyzing trace with hash 258473281, now seen corresponding path program 26 times [2021-12-14 13:51:53,431 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:53,431 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1120720988] [2021-12-14 13:51:53,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:53,431 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:53,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:53,784 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:53,784 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:53,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1120720988] [2021-12-14 13:51:53,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1120720988] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:53,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1703973326] [2021-12-14 13:51:53,784 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-14 13:51:53,784 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:53,785 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:53,785 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:51:53,787 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-12-14 13:51:53,887 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-14 13:51:53,887 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:51:53,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 57 conjunts are in the unsatisfiable core [2021-12-14 13:51:53,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:53,929 INFO L388 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 15 treesize of output 11 [2021-12-14 13:51:53,953 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-12-14 13:51:53,953 INFO L388 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 25 treesize of output 24 [2021-12-14 13:51:54,030 INFO L354 Elim1Store]: treesize reduction 80, result has 20.8 percent of original size [2021-12-14 13:51:54,030 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 36 treesize of output 38 [2021-12-14 13:51:54,522 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 1 proven. 305 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:54,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:55,049 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_main_~i~0#1_365| Int)) (or (and (< 8 |v_ULTIMATE.start_main_~i~0#1_365|) (= (select (store (select |c_#memory_int| |c_ULTIMATE.start_main_~x~0#1.base|) (+ (* |v_ULTIMATE.start_main_~i~0#1_365| 4) |c_ULTIMATE.start_main_~x~0#1.offset|) 0) (+ 36 |c_ULTIMATE.start_main_~x~0#1.offset|)) 0)) (< |v_ULTIMATE.start_main_~i~0#1_365| (+ |c_ULTIMATE.start_main_~i~0#1| 1)))) is different from false [2021-12-14 13:51:55,064 INFO L388 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 27 treesize of output 25 [2021-12-14 13:51:55,066 INFO L388 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 53 treesize of output 49 [2021-12-14 13:51:55,150 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 295 refuted. 0 times theorem prover too weak. 0 trivial. 11 not checked. [2021-12-14 13:51:55,151 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1703973326] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:55,151 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:55,151 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 28, 28] total 45 [2021-12-14 13:51:55,152 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [925346822] [2021-12-14 13:51:55,152 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:55,152 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-12-14 13:51:55,152 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:55,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-12-14 13:51:55,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1749, Unknown=1, NotChecked=84, Total=1980 [2021-12-14 13:51:55,153 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand has 45 states, 45 states have (on average 2.7111111111111112) internal successors, (122), 45 states have internal predecessors, (122), 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) [2021-12-14 13:51:55,598 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((|v_ULTIMATE.start_main_~i~0#1_365| Int)) (or (and (< 8 |v_ULTIMATE.start_main_~i~0#1_365|) (= (select (store (select |c_#memory_int| |c_ULTIMATE.start_main_~x~0#1.base|) (+ (* |v_ULTIMATE.start_main_~i~0#1_365| 4) |c_ULTIMATE.start_main_~x~0#1.offset|) 0) (+ 36 |c_ULTIMATE.start_main_~x~0#1.offset|)) 0)) (< |v_ULTIMATE.start_main_~i~0#1_365| (+ |c_ULTIMATE.start_main_~i~0#1| 1)))) (<= 9 |c_ULTIMATE.start_main_~i~0#1|) (<= |c_ULTIMATE.start_main_~i~0#1| 9) (= (select (select |c_#memory_int| |c_ULTIMATE.start_main_~x~0#1.base|) (+ (* |c_ULTIMATE.start_main_~i~0#1| 4) |c_ULTIMATE.start_main_~x~0#1.offset|)) 0)) is different from false [2021-12-14 13:51:55,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:55,651 INFO L93 Difference]: Finished difference Result 117 states and 119 transitions. [2021-12-14 13:51:55,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-12-14 13:51:55,651 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.7111111111111112) internal successors, (122), 45 states have internal predecessors, (122), 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 68 [2021-12-14 13:51:55,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:55,652 INFO L225 Difference]: With dead ends: 117 [2021-12-14 13:51:55,652 INFO L226 Difference]: Without dead ends: 115 [2021-12-14 13:51:55,653 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 113 SyntacticMatches, 6 SemanticMatches, 44 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 275 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=148, Invalid=1750, Unknown=2, NotChecked=170, Total=2070 [2021-12-14 13:51:55,653 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 42 mSDsluCounter, 611 mSDsCounter, 0 mSdLazyCounter, 330 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 638 SdHoareTripleChecker+Invalid, 449 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 330 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 117 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:55,653 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 638 Invalid, 449 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 330 Invalid, 0 Unknown, 117 Unchecked, 0.1s Time] [2021-12-14 13:51:55,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-12-14 13:51:55,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 71. [2021-12-14 13:51:55,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 70 states have internal predecessors, (72), 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) [2021-12-14 13:51:55,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2021-12-14 13:51:55,667 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 68 [2021-12-14 13:51:55,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:55,667 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2021-12-14 13:51:55,667 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 2.7111111111111112) internal successors, (122), 45 states have internal predecessors, (122), 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) [2021-12-14 13:51:55,667 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2021-12-14 13:51:55,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-12-14 13:51:55,683 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:55,683 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:55,700 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-12-14 13:51:55,884 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-12-14 13:51:55,884 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:55,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:55,885 INFO L85 PathProgramCache]: Analyzing trace with hash 1742430585, now seen corresponding path program 27 times [2021-12-14 13:51:55,885 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:55,886 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2011466119] [2021-12-14 13:51:55,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:55,886 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:55,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:56,137 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 0 proven. 321 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:56,137 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:56,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2011466119] [2021-12-14 13:51:56,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2011466119] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:56,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [535099516] [2021-12-14 13:51:56,138 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-14 13:51:56,138 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:56,138 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:56,139 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:51:56,141 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-12-14 13:51:56,306 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-12-14 13:51:56,306 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:51:56,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 34 conjunts are in the unsatisfiable core [2021-12-14 13:51:56,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:51:56,556 INFO L388 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 15 treesize of output 11 [2021-12-14 13:51:57,331 INFO L354 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-12-14 13:51:57,332 INFO L388 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 44 treesize of output 23 [2021-12-14 13:51:57,351 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 190 proven. 131 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:57,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:51:58,252 INFO L388 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 18 treesize of output 16 [2021-12-14 13:51:58,254 INFO L388 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 28 [2021-12-14 13:51:58,291 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 180 proven. 141 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:58,291 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [535099516] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:51:58,291 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:51:58,291 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 28, 28] total 67 [2021-12-14 13:51:58,291 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082724729] [2021-12-14 13:51:58,291 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:51:58,291 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-12-14 13:51:58,291 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:51:58,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-12-14 13:51:58,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=499, Invalid=3923, Unknown=0, NotChecked=0, Total=4422 [2021-12-14 13:51:58,292 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand has 67 states, 67 states have (on average 2.716417910447761) internal successors, (182), 67 states have internal predecessors, (182), 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) [2021-12-14 13:51:59,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:51:59,297 INFO L93 Difference]: Finished difference Result 121 states and 123 transitions. [2021-12-14 13:51:59,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-12-14 13:51:59,298 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 2.716417910447761) internal successors, (182), 67 states have internal predecessors, (182), 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 70 [2021-12-14 13:51:59,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:51:59,298 INFO L225 Difference]: With dead ends: 121 [2021-12-14 13:51:59,298 INFO L226 Difference]: Without dead ends: 73 [2021-12-14 13:51:59,299 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 120 SyntacticMatches, 1 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1809 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=984, Invalid=9116, Unknown=0, NotChecked=0, Total=10100 [2021-12-14 13:51:59,299 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 25 mSDsluCounter, 614 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 640 SdHoareTripleChecker+Invalid, 399 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 83 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 13:51:59,299 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 640 Invalid, 399 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 313 Invalid, 0 Unknown, 83 Unchecked, 0.1s Time] [2021-12-14 13:51:59,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-12-14 13:51:59,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2021-12-14 13:51:59,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.0277777777777777) internal successors, (74), 72 states have internal predecessors, (74), 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) [2021-12-14 13:51:59,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 74 transitions. [2021-12-14 13:51:59,310 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 74 transitions. Word has length 70 [2021-12-14 13:51:59,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:51:59,311 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 74 transitions. [2021-12-14 13:51:59,311 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 2.716417910447761) internal successors, (182), 67 states have internal predecessors, (182), 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) [2021-12-14 13:51:59,311 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 74 transitions. [2021-12-14 13:51:59,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-12-14 13:51:59,311 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:51:59,311 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:51:59,327 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-12-14 13:51:59,527 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:59,527 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:51:59,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:51:59,528 INFO L85 PathProgramCache]: Analyzing trace with hash -39467689, now seen corresponding path program 28 times [2021-12-14 13:51:59,528 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:51:59,528 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1512738622] [2021-12-14 13:51:59,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:51:59,528 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:51:59,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:51:59,928 INFO L134 CoverageAnalysis]: Checked inductivity of 344 backedges. 0 proven. 344 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:51:59,928 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:51:59,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1512738622] [2021-12-14 13:51:59,929 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1512738622] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:51:59,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1604189060] [2021-12-14 13:51:59,929 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-14 13:51:59,929 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:51:59,930 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:51:59,931 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:51:59,932 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-12-14 13:52:00,309 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-14 13:52:00,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:52:00,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 56 conjunts are in the unsatisfiable core [2021-12-14 13:52:00,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:52:00,364 INFO L388 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 15 treesize of output 11 [2021-12-14 13:52:00,403 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-12-14 13:52:00,403 INFO L388 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 27 treesize of output 26 [2021-12-14 13:52:00,697 INFO L134 CoverageAnalysis]: Checked inductivity of 344 backedges. 0 proven. 344 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:52:00,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:52:00,812 INFO L388 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 16 treesize of output 14 [2021-12-14 13:52:00,814 INFO L388 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 24 [2021-12-14 13:52:00,856 INFO L134 CoverageAnalysis]: Checked inductivity of 344 backedges. 0 proven. 344 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:52:00,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1604189060] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:52:00,857 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:52:00,857 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 42 [2021-12-14 13:52:00,857 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740641938] [2021-12-14 13:52:00,857 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:52:00,857 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-12-14 13:52:00,857 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:52:00,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-12-14 13:52:00,858 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=1610, Unknown=0, NotChecked=0, Total=1722 [2021-12-14 13:52:00,858 INFO L87 Difference]: Start difference. First operand 73 states and 74 transitions. Second operand has 42 states, 42 states have (on average 2.880952380952381) internal successors, (121), 42 states have internal predecessors, (121), 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) [2021-12-14 13:52:01,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:52:01,324 INFO L93 Difference]: Finished difference Result 129 states and 131 transitions. [2021-12-14 13:52:01,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-12-14 13:52:01,324 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.880952380952381) internal successors, (121), 42 states have internal predecessors, (121), 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 72 [2021-12-14 13:52:01,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:52:01,325 INFO L225 Difference]: With dead ends: 129 [2021-12-14 13:52:01,325 INFO L226 Difference]: Without dead ends: 127 [2021-12-14 13:52:01,325 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 124 SyntacticMatches, 6 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 430 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=209, Invalid=2871, Unknown=0, NotChecked=0, Total=3080 [2021-12-14 13:52:01,325 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 37 mSDsluCounter, 734 mSDsCounter, 0 mSdLazyCounter, 1384 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 764 SdHoareTripleChecker+Invalid, 1415 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 1384 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-14 13:52:01,326 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 764 Invalid, 1415 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 1384 Invalid, 0 Unknown, 1 Unchecked, 0.3s Time] [2021-12-14 13:52:01,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-12-14 13:52:01,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 80. [2021-12-14 13:52:01,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.0379746835443038) internal successors, (82), 79 states have internal predecessors, (82), 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) [2021-12-14 13:52:01,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2021-12-14 13:52:01,338 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 72 [2021-12-14 13:52:01,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:52:01,338 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2021-12-14 13:52:01,339 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 2.880952380952381) internal successors, (121), 42 states have internal predecessors, (121), 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) [2021-12-14 13:52:01,339 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2021-12-14 13:52:01,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-12-14 13:52:01,339 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:52:01,339 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:52:01,358 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-12-14 13:52:01,545 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:52:01,545 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:52:01,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:52:01,545 INFO L85 PathProgramCache]: Analyzing trace with hash 1248242101, now seen corresponding path program 29 times [2021-12-14 13:52:01,545 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:52:01,546 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1580807458] [2021-12-14 13:52:01,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:52:01,546 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:52:01,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:52:01,912 INFO L134 CoverageAnalysis]: Checked inductivity of 369 backedges. 0 proven. 369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:52:01,912 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:52:01,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1580807458] [2021-12-14 13:52:01,912 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1580807458] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:52:01,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1021980639] [2021-12-14 13:52:01,912 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-14 13:52:01,912 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:52:01,912 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:52:01,922 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:52:01,923 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-12-14 13:52:02,095 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 14 check-sat command(s) [2021-12-14 13:52:02,095 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:52:02,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 59 conjunts are in the unsatisfiable core [2021-12-14 13:52:02,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:52:02,168 INFO L388 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 15 treesize of output 11 [2021-12-14 13:52:02,200 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-12-14 13:52:02,200 INFO L388 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 25 treesize of output 24 [2021-12-14 13:52:02,239 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-12-14 13:52:02,239 INFO L388 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 25 treesize of output 24 [2021-12-14 13:52:02,666 INFO L134 CoverageAnalysis]: Checked inductivity of 369 backedges. 1 proven. 368 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:52:02,666 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:52:02,935 INFO L388 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 16 treesize of output 14 [2021-12-14 13:52:02,936 INFO L388 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 24 [2021-12-14 13:52:03,009 INFO L134 CoverageAnalysis]: Checked inductivity of 369 backedges. 0 proven. 368 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-14 13:52:03,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1021980639] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:52:03,010 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:52:03,010 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 43 [2021-12-14 13:52:03,010 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966231027] [2021-12-14 13:52:03,010 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:52:03,010 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-12-14 13:52:03,010 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:52:03,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-12-14 13:52:03,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1688, Unknown=0, NotChecked=0, Total=1806 [2021-12-14 13:52:03,011 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand has 43 states, 43 states have (on average 2.9069767441860463) internal successors, (125), 43 states have internal predecessors, (125), 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) [2021-12-14 13:52:03,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:52:03,879 INFO L93 Difference]: Finished difference Result 127 states and 129 transitions. [2021-12-14 13:52:03,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-12-14 13:52:03,880 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.9069767441860463) internal successors, (125), 43 states have internal predecessors, (125), 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 74 [2021-12-14 13:52:03,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:52:03,880 INFO L225 Difference]: With dead ends: 127 [2021-12-14 13:52:03,880 INFO L226 Difference]: Without dead ends: 125 [2021-12-14 13:52:03,881 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 127 SyntacticMatches, 8 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 764 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=371, Invalid=4051, Unknown=0, NotChecked=0, Total=4422 [2021-12-14 13:52:03,881 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 139 mSDsluCounter, 691 mSDsCounter, 0 mSdLazyCounter, 1725 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 718 SdHoareTripleChecker+Invalid, 1846 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 1725 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-14 13:52:03,881 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 718 Invalid, 1846 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 1725 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-14 13:52:03,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-12-14 13:52:03,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 77. [2021-12-14 13:52:03,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.0263157894736843) internal successors, (78), 76 states have internal predecessors, (78), 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) [2021-12-14 13:52:03,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 78 transitions. [2021-12-14 13:52:03,903 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 78 transitions. Word has length 74 [2021-12-14 13:52:03,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:52:03,903 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 78 transitions. [2021-12-14 13:52:03,903 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.9069767441860463) internal successors, (125), 43 states have internal predecessors, (125), 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) [2021-12-14 13:52:03,903 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 78 transitions. [2021-12-14 13:52:03,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-12-14 13:52:03,904 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:52:03,904 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:52:03,923 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-12-14 13:52:04,121 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-12-14 13:52:04,121 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:52:04,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:52:04,122 INFO L85 PathProgramCache]: Analyzing trace with hash -1997172115, now seen corresponding path program 30 times [2021-12-14 13:52:04,122 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:52:04,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1914334507] [2021-12-14 13:52:04,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:52:04,122 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:52:04,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:52:04,480 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 0 proven. 386 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:52:04,480 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:52:04,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1914334507] [2021-12-14 13:52:04,480 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1914334507] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:52:04,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [38790656] [2021-12-14 13:52:04,480 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-14 13:52:04,480 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:52:04,480 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:52:04,481 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:52:04,482 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-12-14 13:52:04,705 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-12-14 13:52:04,705 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:52:04,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 36 conjunts are in the unsatisfiable core [2021-12-14 13:52:04,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:52:04,994 INFO L388 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 15 treesize of output 11 [2021-12-14 13:52:05,966 INFO L354 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-12-14 13:52:05,966 INFO L388 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 44 treesize of output 23 [2021-12-14 13:52:05,998 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 231 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:52:05,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:52:07,079 INFO L388 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 18 treesize of output 16 [2021-12-14 13:52:07,081 INFO L388 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 28 [2021-12-14 13:52:07,118 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 220 proven. 166 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:52:07,118 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [38790656] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:52:07,118 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:52:07,119 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 30, 30] total 72 [2021-12-14 13:52:07,119 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314228362] [2021-12-14 13:52:07,119 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:52:07,119 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2021-12-14 13:52:07,119 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:52:07,119 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-12-14 13:52:07,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=571, Invalid=4541, Unknown=0, NotChecked=0, Total=5112 [2021-12-14 13:52:07,120 INFO L87 Difference]: Start difference. First operand 77 states and 78 transitions. Second operand has 72 states, 72 states have (on average 2.75) internal successors, (198), 72 states have internal predecessors, (198), 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) [2021-12-14 13:52:08,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:52:08,474 INFO L93 Difference]: Finished difference Result 131 states and 133 transitions. [2021-12-14 13:52:08,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-12-14 13:52:08,474 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 2.75) internal successors, (198), 72 states have internal predecessors, (198), 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 76 [2021-12-14 13:52:08,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:52:08,475 INFO L225 Difference]: With dead ends: 131 [2021-12-14 13:52:08,475 INFO L226 Difference]: Without dead ends: 79 [2021-12-14 13:52:08,481 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 122 SyntacticMatches, 1 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2644 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1355, Invalid=12925, Unknown=0, NotChecked=0, Total=14280 [2021-12-14 13:52:08,482 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 57 mSDsluCounter, 625 mSDsCounter, 0 mSdLazyCounter, 394 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 656 SdHoareTripleChecker+Invalid, 603 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 394 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 204 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 13:52:08,482 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 656 Invalid, 603 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 394 Invalid, 0 Unknown, 204 Unchecked, 0.1s Time] [2021-12-14 13:52:08,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-12-14 13:52:08,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2021-12-14 13:52:08,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 78 states have (on average 1.0256410256410255) internal successors, (80), 78 states have internal predecessors, (80), 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) [2021-12-14 13:52:08,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2021-12-14 13:52:08,507 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 76 [2021-12-14 13:52:08,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:52:08,507 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2021-12-14 13:52:08,507 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 2.75) internal successors, (198), 72 states have internal predecessors, (198), 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) [2021-12-14 13:52:08,507 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2021-12-14 13:52:08,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-12-14 13:52:08,508 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:52:08,508 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:52:08,525 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-12-14 13:52:08,723 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:52:08,724 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:52:08,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:52:08,724 INFO L85 PathProgramCache]: Analyzing trace with hash 131143627, now seen corresponding path program 31 times [2021-12-14 13:52:08,724 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:52:08,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [402741560] [2021-12-14 13:52:08,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:52:08,724 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:52:08,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:52:09,124 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 0 proven. 411 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:52:09,124 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:52:09,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [402741560] [2021-12-14 13:52:09,124 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [402741560] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:52:09,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [217934888] [2021-12-14 13:52:09,125 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-14 13:52:09,125 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:52:09,125 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:52:09,126 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:52:09,127 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-12-14 13:52:09,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:52:09,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 60 conjunts are in the unsatisfiable core [2021-12-14 13:52:09,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:52:09,283 INFO L388 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 15 treesize of output 11 [2021-12-14 13:52:09,336 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-12-14 13:52:09,336 INFO L388 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 27 treesize of output 26 [2021-12-14 13:52:09,815 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 0 proven. 411 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:52:09,815 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:52:09,962 INFO L388 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 16 treesize of output 14 [2021-12-14 13:52:09,964 INFO L388 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 24 [2021-12-14 13:52:10,013 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 0 proven. 411 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:52:10,013 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [217934888] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:52:10,013 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:52:10,013 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 45 [2021-12-14 13:52:10,013 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [509832764] [2021-12-14 13:52:10,014 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:52:10,014 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-12-14 13:52:10,014 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:52:10,014 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-12-14 13:52:10,014 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1860, Unknown=0, NotChecked=0, Total=1980 [2021-12-14 13:52:10,015 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand has 45 states, 45 states have (on average 2.911111111111111) internal successors, (131), 45 states have internal predecessors, (131), 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) [2021-12-14 13:52:10,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:52:10,718 INFO L93 Difference]: Finished difference Result 139 states and 141 transitions. [2021-12-14 13:52:10,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-12-14 13:52:10,718 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.911111111111111) internal successors, (131), 45 states have internal predecessors, (131), 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 78 [2021-12-14 13:52:10,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:52:10,719 INFO L225 Difference]: With dead ends: 139 [2021-12-14 13:52:10,719 INFO L226 Difference]: Without dead ends: 137 [2021-12-14 13:52:10,720 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 135 SyntacticMatches, 6 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 490 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=224, Invalid=3316, Unknown=0, NotChecked=0, Total=3540 [2021-12-14 13:52:10,720 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 37 mSDsluCounter, 903 mSDsCounter, 0 mSdLazyCounter, 1798 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 935 SdHoareTripleChecker+Invalid, 1830 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 1798 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-14 13:52:10,720 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 935 Invalid, 1830 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 1798 Invalid, 0 Unknown, 1 Unchecked, 0.5s Time] [2021-12-14 13:52:10,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-12-14 13:52:10,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 86. [2021-12-14 13:52:10,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.035294117647059) internal successors, (88), 85 states have internal predecessors, (88), 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) [2021-12-14 13:52:10,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2021-12-14 13:52:10,746 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 78 [2021-12-14 13:52:10,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:52:10,746 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2021-12-14 13:52:10,746 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 2.911111111111111) internal successors, (131), 45 states have internal predecessors, (131), 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) [2021-12-14 13:52:10,746 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2021-12-14 13:52:10,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-12-14 13:52:10,746 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:52:10,747 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:52:10,763 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-12-14 13:52:10,962 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:52:10,963 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:52:10,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:52:10,963 INFO L85 PathProgramCache]: Analyzing trace with hash 1038138793, now seen corresponding path program 32 times [2021-12-14 13:52:10,963 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:52:10,963 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1443879238] [2021-12-14 13:52:10,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:52:10,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:52:10,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:52:11,384 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 0 proven. 438 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:52:11,384 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:52:11,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1443879238] [2021-12-14 13:52:11,384 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1443879238] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:52:11,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1856448205] [2021-12-14 13:52:11,384 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-14 13:52:11,384 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:52:11,384 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:52:11,385 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:52:11,386 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-12-14 13:52:11,482 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-14 13:52:11,482 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:52:11,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 65 conjunts are in the unsatisfiable core [2021-12-14 13:52:11,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:52:11,568 INFO L388 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 15 treesize of output 11 [2021-12-14 13:52:11,605 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-12-14 13:52:11,606 INFO L388 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 25 treesize of output 24 [2021-12-14 13:52:11,692 INFO L354 Elim1Store]: treesize reduction 80, result has 20.8 percent of original size [2021-12-14 13:52:11,692 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 36 treesize of output 38 [2021-12-14 13:52:12,551 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 1 proven. 437 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:52:12,551 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:52:13,173 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_main_~i~0#1_515| Int)) (or (and (< 10 |v_ULTIMATE.start_main_~i~0#1_515|) (= (select (store (select |c_#memory_int| |c_ULTIMATE.start_main_~x~0#1.base|) (+ (* |v_ULTIMATE.start_main_~i~0#1_515| 4) |c_ULTIMATE.start_main_~x~0#1.offset|) 0) (+ 44 |c_ULTIMATE.start_main_~x~0#1.offset|)) 0)) (< |v_ULTIMATE.start_main_~i~0#1_515| (+ |c_ULTIMATE.start_main_~i~0#1| 1)))) is different from false [2021-12-14 13:52:13,178 INFO L388 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 27 treesize of output 25 [2021-12-14 13:52:13,180 INFO L388 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 53 treesize of output 49 [2021-12-14 13:52:13,265 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 0 proven. 425 refuted. 0 times theorem prover too weak. 0 trivial. 13 not checked. [2021-12-14 13:52:13,265 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1856448205] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:52:13,265 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:52:13,265 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 32, 32] total 51 [2021-12-14 13:52:13,265 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211767681] [2021-12-14 13:52:13,265 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:52:13,265 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-12-14 13:52:13,265 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:52:13,266 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-12-14 13:52:13,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=2289, Unknown=1, NotChecked=96, Total=2550 [2021-12-14 13:52:13,266 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand has 51 states, 51 states have (on average 2.784313725490196) internal successors, (142), 51 states have internal predecessors, (142), 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) [2021-12-14 13:52:13,826 WARN L838 $PredicateComparison]: unable to prove that (and (<= |c_ULTIMATE.start_main_~i~0#1| 11) (forall ((|v_ULTIMATE.start_main_~i~0#1_515| Int)) (or (and (< 10 |v_ULTIMATE.start_main_~i~0#1_515|) (= (select (store (select |c_#memory_int| |c_ULTIMATE.start_main_~x~0#1.base|) (+ (* |v_ULTIMATE.start_main_~i~0#1_515| 4) |c_ULTIMATE.start_main_~x~0#1.offset|) 0) (+ 44 |c_ULTIMATE.start_main_~x~0#1.offset|)) 0)) (< |v_ULTIMATE.start_main_~i~0#1_515| (+ |c_ULTIMATE.start_main_~i~0#1| 1)))) (= (select (select |c_#memory_int| |c_ULTIMATE.start_main_~x~0#1.base|) (+ (* |c_ULTIMATE.start_main_~i~0#1| 4) |c_ULTIMATE.start_main_~x~0#1.offset|)) 0) (<= 11 |c_ULTIMATE.start_main_~i~0#1|)) is different from false [2021-12-14 13:52:13,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:52:13,886 INFO L93 Difference]: Finished difference Result 137 states and 139 transitions. [2021-12-14 13:52:13,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-12-14 13:52:13,887 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.784313725490196) internal successors, (142), 51 states have internal predecessors, (142), 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 80 [2021-12-14 13:52:13,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:52:13,887 INFO L225 Difference]: With dead ends: 137 [2021-12-14 13:52:13,888 INFO L226 Difference]: Without dead ends: 135 [2021-12-14 13:52:13,888 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 135 SyntacticMatches, 6 SemanticMatches, 50 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 326 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=166, Invalid=2290, Unknown=2, NotChecked=194, Total=2652 [2021-12-14 13:52:13,888 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 48 mSDsluCounter, 860 mSDsCounter, 0 mSdLazyCounter, 722 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 891 SdHoareTripleChecker+Invalid, 1010 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 722 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 283 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-14 13:52:13,888 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 891 Invalid, 1010 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 722 Invalid, 0 Unknown, 283 Unchecked, 0.2s Time] [2021-12-14 13:52:13,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-12-14 13:52:13,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 83. [2021-12-14 13:52:13,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.024390243902439) internal successors, (84), 82 states have internal predecessors, (84), 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) [2021-12-14 13:52:13,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2021-12-14 13:52:13,905 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 80 [2021-12-14 13:52:13,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:52:13,906 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2021-12-14 13:52:13,906 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.784313725490196) internal successors, (142), 51 states have internal predecessors, (142), 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) [2021-12-14 13:52:13,906 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2021-12-14 13:52:13,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-12-14 13:52:13,906 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:52:13,906 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:52:13,922 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2021-12-14 13:52:14,119 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-12-14 13:52:14,119 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:52:14,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:52:14,119 INFO L85 PathProgramCache]: Analyzing trace with hash 260737761, now seen corresponding path program 33 times [2021-12-14 13:52:14,120 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:52:14,120 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [851037730] [2021-12-14 13:52:14,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:52:14,120 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:52:14,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:52:14,717 INFO L134 CoverageAnalysis]: Checked inductivity of 457 backedges. 0 proven. 457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:52:14,717 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:52:14,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [851037730] [2021-12-14 13:52:14,718 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [851037730] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:52:14,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1529114287] [2021-12-14 13:52:14,718 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-14 13:52:14,718 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:52:14,718 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:52:14,719 INFO L229 MonitoredProcess]: Starting monitored process 35 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:52:14,720 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-12-14 13:52:14,919 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-12-14 13:52:14,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:52:14,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 38 conjunts are in the unsatisfiable core [2021-12-14 13:52:14,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:52:15,110 INFO L388 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 15 treesize of output 11 [2021-12-14 13:52:15,840 INFO L354 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-12-14 13:52:15,841 INFO L388 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 44 treesize of output 23 [2021-12-14 13:52:15,860 INFO L134 CoverageAnalysis]: Checked inductivity of 457 backedges. 276 proven. 181 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:52:15,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:52:16,673 INFO L388 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 18 treesize of output 16 [2021-12-14 13:52:16,675 INFO L388 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 28 [2021-12-14 13:52:16,698 INFO L134 CoverageAnalysis]: Checked inductivity of 457 backedges. 264 proven. 193 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:52:16,698 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1529114287] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:52:16,698 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:52:16,698 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 32, 32] total 77 [2021-12-14 13:52:16,699 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44855639] [2021-12-14 13:52:16,699 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:52:16,699 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2021-12-14 13:52:16,699 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:52:16,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-12-14 13:52:16,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=660, Invalid=5192, Unknown=0, NotChecked=0, Total=5852 [2021-12-14 13:52:16,700 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand has 77 states, 77 states have (on average 2.779220779220779) internal successors, (214), 77 states have internal predecessors, (214), 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) [2021-12-14 13:52:17,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:52:17,653 INFO L93 Difference]: Finished difference Result 141 states and 143 transitions. [2021-12-14 13:52:17,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-12-14 13:52:17,667 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 2.779220779220779) internal successors, (214), 77 states have internal predecessors, (214), 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 82 [2021-12-14 13:52:17,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:52:17,668 INFO L225 Difference]: With dead ends: 141 [2021-12-14 13:52:17,668 INFO L226 Difference]: Without dead ends: 85 [2021-12-14 13:52:17,669 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 141 SyntacticMatches, 1 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3242 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1309, Invalid=12263, Unknown=0, NotChecked=0, Total=13572 [2021-12-14 13:52:17,669 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 78 mSDsluCounter, 700 mSDsCounter, 0 mSdLazyCounter, 392 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 730 SdHoareTripleChecker+Invalid, 604 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 392 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 210 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 13:52:17,679 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [78 Valid, 730 Invalid, 604 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 392 Invalid, 0 Unknown, 210 Unchecked, 0.1s Time] [2021-12-14 13:52:17,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-12-14 13:52:17,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2021-12-14 13:52:17,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.0238095238095237) internal successors, (86), 84 states have internal predecessors, (86), 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) [2021-12-14 13:52:17,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 86 transitions. [2021-12-14 13:52:17,697 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 86 transitions. Word has length 82 [2021-12-14 13:52:17,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:52:17,697 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 86 transitions. [2021-12-14 13:52:17,697 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 2.779220779220779) internal successors, (214), 77 states have internal predecessors, (214), 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) [2021-12-14 13:52:17,697 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 86 transitions. [2021-12-14 13:52:17,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-12-14 13:52:17,698 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:52:17,698 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:52:17,715 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-12-14 13:52:17,915 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-12-14 13:52:17,915 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:52:17,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:52:17,916 INFO L85 PathProgramCache]: Analyzing trace with hash -948432449, now seen corresponding path program 34 times [2021-12-14 13:52:17,916 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:52:17,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [825590847] [2021-12-14 13:52:17,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:52:17,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:52:17,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:52:18,440 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:52:18,440 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:52:18,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [825590847] [2021-12-14 13:52:18,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [825590847] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:52:18,441 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [452774899] [2021-12-14 13:52:18,441 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-14 13:52:18,441 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:52:18,441 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:52:18,442 INFO L229 MonitoredProcess]: Starting monitored process 36 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:52:18,444 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-12-14 13:52:19,016 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-14 13:52:19,017 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:52:19,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 69 conjunts are in the unsatisfiable core [2021-12-14 13:52:19,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:52:19,294 INFO L388 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 15 treesize of output 11 [2021-12-14 13:52:19,358 INFO L354 Elim1Store]: treesize reduction 40, result has 23.1 percent of original size [2021-12-14 13:52:19,359 INFO L388 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 28 treesize of output 27 [2021-12-14 13:52:19,457 INFO L354 Elim1Store]: treesize reduction 92, result has 20.7 percent of original size [2021-12-14 13:52:19,458 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 39 treesize of output 41 [2021-12-14 13:52:21,507 INFO L354 Elim1Store]: treesize reduction 91, result has 3.2 percent of original size [2021-12-14 13:52:21,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 63 treesize of output 29 [2021-12-14 13:52:21,538 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:52:21,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:52:22,387 INFO L388 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 16 treesize of output 14 [2021-12-14 13:52:22,389 INFO L388 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 24 [2021-12-14 13:52:22,473 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 478 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-14 13:52:22,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [452774899] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:52:22,473 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:52:22,473 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 35, 31] total 82 [2021-12-14 13:52:22,474 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555213550] [2021-12-14 13:52:22,474 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:52:22,475 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2021-12-14 13:52:22,475 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:52:22,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-12-14 13:52:22,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=606, Invalid=6036, Unknown=0, NotChecked=0, Total=6642 [2021-12-14 13:52:22,483 INFO L87 Difference]: Start difference. First operand 85 states and 86 transitions. Second operand has 82 states, 82 states have (on average 2.707317073170732) internal successors, (222), 82 states have internal predecessors, (222), 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)