./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/loops/invert_string-3.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 35987657 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/loops/invert_string-3.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash ca98535e808a51f7cfa7d21c9d33f259821212a6554e27f29c2bddd9197c0249 --- Real Ultimate output --- This is Ultimate 0.2.2-?-3598765 [2022-07-21 02:28:36,657 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-21 02:28:36,659 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-21 02:28:36,684 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-21 02:28:36,684 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-21 02:28:36,685 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-21 02:28:36,686 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-21 02:28:36,689 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-21 02:28:36,692 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-21 02:28:36,695 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-21 02:28:36,696 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-21 02:28:36,698 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-21 02:28:36,699 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-21 02:28:36,700 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-21 02:28:36,703 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-21 02:28:36,706 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-21 02:28:36,706 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-21 02:28:36,708 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-21 02:28:36,710 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-21 02:28:36,714 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-21 02:28:36,715 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-21 02:28:36,716 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-21 02:28:36,717 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-21 02:28:36,718 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-21 02:28:36,719 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-21 02:28:36,724 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-21 02:28:36,725 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-21 02:28:36,726 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-21 02:28:36,726 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-21 02:28:36,727 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-21 02:28:36,727 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-21 02:28:36,727 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-21 02:28:36,729 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-21 02:28:36,729 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-21 02:28:36,730 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-21 02:28:36,731 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-21 02:28:36,731 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-21 02:28:36,731 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-21 02:28:36,731 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-21 02:28:36,731 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-21 02:28:36,732 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-21 02:28:36,736 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-21 02:28:36,737 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2022-07-21 02:28:36,758 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-21 02:28:36,758 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-21 02:28:36,758 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-21 02:28:36,759 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-21 02:28:36,759 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-07-21 02:28:36,759 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-07-21 02:28:36,760 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-21 02:28:36,760 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-21 02:28:36,760 INFO L138 SettingsManager]: * Use SBE=true [2022-07-21 02:28:36,761 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-21 02:28:36,761 INFO L138 SettingsManager]: * sizeof long=4 [2022-07-21 02:28:36,761 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-07-21 02:28:36,761 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-07-21 02:28:36,762 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-21 02:28:36,762 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-07-21 02:28:36,762 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-07-21 02:28:36,762 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-07-21 02:28:36,762 INFO L138 SettingsManager]: * sizeof long double=12 [2022-07-21 02:28:36,762 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-07-21 02:28:36,763 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-21 02:28:36,763 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-07-21 02:28:36,763 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-21 02:28:36,763 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-21 02:28:36,763 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-07-21 02:28:36,763 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-21 02:28:36,764 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-21 02:28:36,764 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-07-21 02:28:36,764 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-07-21 02:28:36,764 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-07-21 02:28:36,764 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-07-21 02:28:36,764 INFO L138 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2022-07-21 02:28:36,765 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-07-21 02:28:36,765 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-07-21 02:28:36,765 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ca98535e808a51f7cfa7d21c9d33f259821212a6554e27f29c2bddd9197c0249 [2022-07-21 02:28:36,990 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-21 02:28:37,014 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-21 02:28:37,016 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-21 02:28:37,016 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-21 02:28:37,024 INFO L275 PluginConnector]: CDTParser initialized [2022-07-21 02:28:37,025 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops/invert_string-3.c [2022-07-21 02:28:37,071 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/060b95ce6/ba3eaa1f8b52473b98b53c786544226d/FLAG15b3b30c2 [2022-07-21 02:28:37,434 INFO L306 CDTParser]: Found 1 translation units. [2022-07-21 02:28:37,434 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops/invert_string-3.c [2022-07-21 02:28:37,438 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/060b95ce6/ba3eaa1f8b52473b98b53c786544226d/FLAG15b3b30c2 [2022-07-21 02:28:37,451 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/060b95ce6/ba3eaa1f8b52473b98b53c786544226d [2022-07-21 02:28:37,452 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-21 02:28:37,454 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-21 02:28:37,456 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-21 02:28:37,456 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-21 02:28:37,459 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-21 02:28:37,459 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:28:37" (1/1) ... [2022-07-21 02:28:37,460 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@73521b12 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:28:37, skipping insertion in model container [2022-07-21 02:28:37,460 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:28:37" (1/1) ... [2022-07-21 02:28:37,464 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-21 02:28:37,479 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-21 02:28:37,602 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/loops/invert_string-3.c[327,340] [2022-07-21 02:28:37,619 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-21 02:28:37,630 INFO L203 MainTranslator]: Completed pre-run [2022-07-21 02:28:37,673 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/loops/invert_string-3.c[327,340] [2022-07-21 02:28:37,688 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-21 02:28:37,697 INFO L208 MainTranslator]: Completed translation [2022-07-21 02:28:37,698 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:28:37 WrapperNode [2022-07-21 02:28:37,698 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-21 02:28:37,699 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-07-21 02:28:37,700 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-07-21 02:28:37,700 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-07-21 02:28:37,704 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:28:37" (1/1) ... [2022-07-21 02:28:37,715 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:28:37" (1/1) ... [2022-07-21 02:28:37,735 INFO L137 Inliner]: procedures = 14, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 69 [2022-07-21 02:28:37,736 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-07-21 02:28:37,737 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-07-21 02:28:37,737 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-07-21 02:28:37,737 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-07-21 02:28:37,742 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:28:37" (1/1) ... [2022-07-21 02:28:37,743 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:28:37" (1/1) ... [2022-07-21 02:28:37,746 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:28:37" (1/1) ... [2022-07-21 02:28:37,746 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:28:37" (1/1) ... [2022-07-21 02:28:37,756 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:28:37" (1/1) ... [2022-07-21 02:28:37,759 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:28:37" (1/1) ... [2022-07-21 02:28:37,765 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:28:37" (1/1) ... [2022-07-21 02:28:37,768 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-07-21 02:28:37,769 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-07-21 02:28:37,770 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-07-21 02:28:37,770 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-07-21 02:28:37,771 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:28:37" (1/1) ... [2022-07-21 02:28:37,775 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-21 02:28:37,782 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 02:28:37,805 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) [2022-07-21 02:28:37,827 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 [2022-07-21 02:28:37,845 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-07-21 02:28:37,845 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-07-21 02:28:37,845 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-07-21 02:28:37,845 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-07-21 02:28:37,845 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-07-21 02:28:37,845 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-07-21 02:28:37,846 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-07-21 02:28:37,846 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-07-21 02:28:37,894 INFO L234 CfgBuilder]: Building ICFG [2022-07-21 02:28:37,895 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-07-21 02:28:37,979 INFO L275 CfgBuilder]: Performing block encoding [2022-07-21 02:28:37,983 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-07-21 02:28:37,983 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2022-07-21 02:28:37,984 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:28:37 BoogieIcfgContainer [2022-07-21 02:28:37,984 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-07-21 02:28:37,985 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-07-21 02:28:37,986 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-07-21 02:28:37,987 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-07-21 02:28:37,988 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 02:28:37" (1/3) ... [2022-07-21 02:28:37,988 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3702ed18 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:28:37, skipping insertion in model container [2022-07-21 02:28:37,988 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:28:37" (2/3) ... [2022-07-21 02:28:37,989 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3702ed18 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:28:37, skipping insertion in model container [2022-07-21 02:28:37,989 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:28:37" (3/3) ... [2022-07-21 02:28:37,990 INFO L111 eAbstractionObserver]: Analyzing ICFG invert_string-3.c [2022-07-21 02:28:37,999 INFO L201 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-07-21 02:28:37,999 INFO L160 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-07-21 02:28:38,061 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-21 02:28:38,066 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@52ece2a9, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@af771b5 [2022-07-21 02:28:38,066 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-07-21 02:28:38,069 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 16 states have (on average 1.5) internal successors, (24), 17 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) [2022-07-21 02:28:38,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-07-21 02:28:38,086 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 02:28:38,086 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 02:28:38,086 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 02:28:38,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 02:28:38,090 INFO L85 PathProgramCache]: Analyzing trace with hash -2016449835, now seen corresponding path program 1 times [2022-07-21 02:28:38,095 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 02:28:38,096 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31053935] [2022-07-21 02:28:38,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 02:28:38,097 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 02:28:38,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 02:28:38,411 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 02:28:38,412 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 02:28:38,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31053935] [2022-07-21 02:28:38,413 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [31053935] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 02:28:38,413 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 02:28:38,413 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-07-21 02:28:38,414 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1448085861] [2022-07-21 02:28:38,414 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 02:28:38,417 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-07-21 02:28:38,417 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 02:28:38,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-07-21 02:28:38,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-07-21 02:28:38,442 INFO L87 Difference]: Start difference. First operand has 18 states, 16 states have (on average 1.5) internal successors, (24), 17 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) Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 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) [2022-07-21 02:28:38,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 02:28:38,527 INFO L93 Difference]: Finished difference Result 34 states and 46 transitions. [2022-07-21 02:28:38,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-07-21 02:28:38,529 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 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 9 [2022-07-21 02:28:38,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 02:28:38,534 INFO L225 Difference]: With dead ends: 34 [2022-07-21 02:28:38,534 INFO L226 Difference]: Without dead ends: 16 [2022-07-21 02:28:38,537 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-07-21 02:28:38,542 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 19 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-21 02:28:38,543 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 21 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-21 02:28:38,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-07-21 02:28:38,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2022-07-21 02:28:38,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 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) [2022-07-21 02:28:38,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2022-07-21 02:28:38,568 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2022-07-21 02:28:38,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 02:28:38,568 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2022-07-21 02:28:38,569 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 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) [2022-07-21 02:28:38,569 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2022-07-21 02:28:38,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-07-21 02:28:38,569 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 02:28:38,570 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 02:28:38,570 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-07-21 02:28:38,571 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 02:28:38,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 02:28:38,573 INFO L85 PathProgramCache]: Analyzing trace with hash 867342291, now seen corresponding path program 1 times [2022-07-21 02:28:38,573 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 02:28:38,573 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [256093636] [2022-07-21 02:28:38,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 02:28:38,574 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 02:28:38,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 02:28:38,693 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-21 02:28:38,694 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 02:28:38,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [256093636] [2022-07-21 02:28:38,695 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [256093636] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 02:28:38,695 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 02:28:38,695 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-21 02:28:38,696 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32049034] [2022-07-21 02:28:38,696 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 02:28:38,697 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-21 02:28:38,697 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 02:28:38,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-21 02:28:38,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-21 02:28:38,699 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 02:28:38,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 02:28:38,723 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2022-07-21 02:28:38,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-21 02:28:38,724 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-07-21 02:28:38,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 02:28:38,725 INFO L225 Difference]: With dead ends: 28 [2022-07-21 02:28:38,725 INFO L226 Difference]: Without dead ends: 17 [2022-07-21 02:28:38,728 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-21 02:28:38,729 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 1 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-21 02:28:38,730 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 19 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-21 02:28:38,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-07-21 02:28:38,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2022-07-21 02:28:38,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2) internal successors, (18), 15 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) [2022-07-21 02:28:38,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2022-07-21 02:28:38,738 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 11 [2022-07-21 02:28:38,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 02:28:38,739 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2022-07-21 02:28:38,739 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 02:28:38,741 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2022-07-21 02:28:38,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-07-21 02:28:38,743 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 02:28:38,743 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 02:28:38,743 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-07-21 02:28:38,744 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 02:28:38,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 02:28:38,746 INFO L85 PathProgramCache]: Analyzing trace with hash 2031054225, now seen corresponding path program 1 times [2022-07-21 02:28:38,746 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 02:28:38,746 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1491461741] [2022-07-21 02:28:38,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 02:28:38,747 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 02:28:38,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 02:28:38,860 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-21 02:28:38,861 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 02:28:38,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1491461741] [2022-07-21 02:28:38,861 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1491461741] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 02:28:38,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1602077881] [2022-07-21 02:28:38,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 02:28:38,862 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 02:28:38,863 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 02:28:38,864 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) [2022-07-21 02:28:38,865 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-07-21 02:28:38,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 02:28:38,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 34 conjunts are in the unsatisfiable core [2022-07-21 02:28:38,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 02:28:38,967 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-07-21 02:28:39,065 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 49 [2022-07-21 02:28:39,076 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 12 [2022-07-21 02:28:39,081 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2022-07-21 02:28:39,134 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2022-07-21 02:28:39,318 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-21 02:28:39,320 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-21 02:28:39,321 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 20 [2022-07-21 02:28:39,338 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-21 02:28:39,338 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 02:28:39,567 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-07-21 02:28:39,568 INFO L390 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 330 treesize of output 1 [2022-07-21 02:28:39,569 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-21 02:28:39,569 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1602077881] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 02:28:39,570 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 02:28:39,570 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 9, 8] total 17 [2022-07-21 02:28:39,570 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076784318] [2022-07-21 02:28:39,570 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 02:28:39,572 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-07-21 02:28:39,572 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 02:28:39,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-07-21 02:28:39,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2022-07-21 02:28:39,574 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 17 states, 17 states have (on average 2.0) internal successors, (34), 17 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) [2022-07-21 02:28:40,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 02:28:40,162 INFO L93 Difference]: Finished difference Result 50 states and 56 transitions. [2022-07-21 02:28:40,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-07-21 02:28:40,163 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 17 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) Word has length 13 [2022-07-21 02:28:40,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 02:28:40,164 INFO L225 Difference]: With dead ends: 50 [2022-07-21 02:28:40,164 INFO L226 Difference]: Without dead ends: 39 [2022-07-21 02:28:40,164 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=205, Invalid=607, Unknown=0, NotChecked=0, Total=812 [2022-07-21 02:28:40,165 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 52 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 02:28:40,165 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 70 Invalid, 217 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 165 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-21 02:28:40,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-07-21 02:28:40,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 23. [2022-07-21 02:28:40,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 22 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) [2022-07-21 02:28:40,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2022-07-21 02:28:40,176 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 13 [2022-07-21 02:28:40,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 02:28:40,177 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2022-07-21 02:28:40,177 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 17 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) [2022-07-21 02:28:40,177 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2022-07-21 02:28:40,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-07-21 02:28:40,177 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 02:28:40,177 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 02:28:40,198 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-07-21 02:28:40,391 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 02:28:40,392 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 02:28:40,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 02:28:40,392 INFO L85 PathProgramCache]: Analyzing trace with hash -799235507, now seen corresponding path program 2 times [2022-07-21 02:28:40,392 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 02:28:40,392 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [636034230] [2022-07-21 02:28:40,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 02:28:40,392 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 02:28:40,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 02:28:40,519 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-07-21 02:28:40,519 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 02:28:40,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [636034230] [2022-07-21 02:28:40,520 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [636034230] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 02:28:40,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1410500918] [2022-07-21 02:28:40,520 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-21 02:28:40,520 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 02:28:40,520 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 02:28:40,521 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) [2022-07-21 02:28:40,523 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-07-21 02:28:40,568 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-21 02:28:40,569 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 02:28:40,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 33 conjunts are in the unsatisfiable core [2022-07-21 02:28:40,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 02:28:40,576 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-07-21 02:28:40,724 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 19 [2022-07-21 02:28:40,884 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-21 02:28:40,889 INFO L356 Elim1Store]: treesize reduction 15, result has 16.7 percent of original size [2022-07-21 02:28:40,890 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 66 treesize of output 23 [2022-07-21 02:28:40,906 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-07-21 02:28:40,906 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 02:28:41,054 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 02:28:41,054 INFO L390 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 82 treesize of output 78 [2022-07-21 02:28:41,104 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-07-21 02:28:41,104 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2022-07-21 02:28:41,107 INFO L390 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 39 treesize of output 30 [2022-07-21 02:28:41,130 INFO L356 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2022-07-21 02:28:41,131 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 61 treesize of output 1 [2022-07-21 02:28:41,144 INFO L356 Elim1Store]: treesize reduction 27, result has 37.2 percent of original size [2022-07-21 02:28:41,144 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 106 treesize of output 91 [2022-07-21 02:28:41,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 02:28:41,161 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 17 [2022-07-21 02:28:41,163 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 02:28:41,166 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 02:28:41,168 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 02:28:41,169 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 1 [2022-07-21 02:28:41,177 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 02:28:41,177 INFO L390 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 80 treesize of output 76 [2022-07-21 02:28:41,224 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 02:28:41,228 INFO L356 Elim1Store]: treesize reduction 5, result has 68.8 percent of original size [2022-07-21 02:28:41,228 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 48 treesize of output 39 [2022-07-21 02:28:41,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 02:28:41,237 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 16 [2022-07-21 02:28:41,240 INFO L390 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 36 treesize of output 28 [2022-07-21 02:28:41,264 INFO L356 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2022-07-21 02:28:41,265 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 1 [2022-07-21 02:28:41,381 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-07-21 02:28:41,381 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1410500918] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 02:28:41,381 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 02:28:41,381 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 11, 10] total 23 [2022-07-21 02:28:41,382 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [895894615] [2022-07-21 02:28:41,382 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 02:28:41,383 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-07-21 02:28:41,383 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 02:28:41,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-07-21 02:28:41,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=420, Unknown=0, NotChecked=0, Total=506 [2022-07-21 02:28:41,388 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 23 states have internal predecessors, (40), 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) [2022-07-21 02:28:42,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 02:28:42,477 INFO L93 Difference]: Finished difference Result 54 states and 61 transitions. [2022-07-21 02:28:42,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-07-21 02:28:42,477 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 23 states have internal predecessors, (40), 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 17 [2022-07-21 02:28:42,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 02:28:42,478 INFO L225 Difference]: With dead ends: 54 [2022-07-21 02:28:42,478 INFO L226 Difference]: Without dead ends: 44 [2022-07-21 02:28:42,479 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 289 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=354, Invalid=1368, Unknown=0, NotChecked=0, Total=1722 [2022-07-21 02:28:42,479 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 99 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 242 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 02:28:42,480 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [99 Valid, 75 Invalid, 347 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 242 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-21 02:28:42,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-07-21 02:28:42,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 29. [2022-07-21 02:28:42,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 28 states have internal predecessors, (33), 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) [2022-07-21 02:28:42,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2022-07-21 02:28:42,491 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 17 [2022-07-21 02:28:42,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 02:28:42,492 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2022-07-21 02:28:42,492 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 23 states have internal predecessors, (40), 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) [2022-07-21 02:28:42,492 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2022-07-21 02:28:42,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-07-21 02:28:42,492 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 02:28:42,492 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 02:28:42,512 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-07-21 02:28:42,709 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2022-07-21 02:28:42,710 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 02:28:42,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 02:28:42,710 INFO L85 PathProgramCache]: Analyzing trace with hash -1667973471, now seen corresponding path program 1 times [2022-07-21 02:28:42,711 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 02:28:42,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1331639443] [2022-07-21 02:28:42,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 02:28:42,711 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 02:28:42,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 02:28:42,824 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-07-21 02:28:42,824 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 02:28:42,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1331639443] [2022-07-21 02:28:42,824 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1331639443] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 02:28:42,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1915068460] [2022-07-21 02:28:42,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 02:28:42,825 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 02:28:42,825 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 02:28:42,826 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) [2022-07-21 02:28:42,827 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-07-21 02:28:42,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 02:28:42,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 44 conjunts are in the unsatisfiable core [2022-07-21 02:28:42,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 02:28:42,874 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-07-21 02:28:43,033 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 19 [2022-07-21 02:28:43,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 02:28:43,117 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 32 [2022-07-21 02:28:43,442 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-21 02:28:43,444 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-21 02:28:43,445 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 64 treesize of output 20 [2022-07-21 02:28:43,462 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-07-21 02:28:43,462 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 02:28:43,793 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 02:28:43,794 INFO L390 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 460 treesize of output 428 [2022-07-21 02:28:44,586 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 02:28:44,587 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 194 treesize of output 166 [2022-07-21 02:28:44,592 INFO L390 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 490 treesize of output 454 [2022-07-21 02:28:44,652 INFO L356 Elim1Store]: treesize reduction 31, result has 34.0 percent of original size [2022-07-21 02:28:44,652 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 2094 treesize of output 1805 [2022-07-21 02:28:45,185 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 02:28:45,185 INFO L390 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 460 treesize of output 428 [2022-07-21 02:28:46,336 INFO L356 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-07-21 02:28:46,337 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 731 treesize of output 637 [2022-07-21 02:28:47,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 02:28:47,455 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 02:28:47,455 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 284 treesize of output 235 [2022-07-21 02:28:47,486 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 02:28:47,487 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 23 [2022-07-21 02:28:47,490 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-21 02:28:47,492 INFO L390 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 39 treesize of output 30 [2022-07-21 02:28:47,890 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-07-21 02:28:47,890 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1915068460] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 02:28:47,890 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 02:28:47,890 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 15, 15] total 33 [2022-07-21 02:28:47,891 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483998872] [2022-07-21 02:28:47,891 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 02:28:47,891 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-07-21 02:28:47,891 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 02:28:47,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-07-21 02:28:47,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=908, Unknown=0, NotChecked=0, Total=1056 [2022-07-21 02:28:47,892 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 33 states, 33 states have (on average 1.7272727272727273) internal successors, (57), 33 states have internal predecessors, (57), 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) [2022-07-21 02:28:49,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 02:28:49,706 INFO L93 Difference]: Finished difference Result 65 states and 71 transitions. [2022-07-21 02:28:49,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-07-21 02:28:49,707 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.7272727272727273) internal successors, (57), 33 states have internal predecessors, (57), 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 23 [2022-07-21 02:28:49,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 02:28:49,707 INFO L225 Difference]: With dead ends: 65 [2022-07-21 02:28:49,707 INFO L226 Difference]: Without dead ends: 56 [2022-07-21 02:28:49,708 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 561 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=396, Invalid=2256, Unknown=0, NotChecked=0, Total=2652 [2022-07-21 02:28:49,709 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 67 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 298 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 442 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 298 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 61 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-21 02:28:49,709 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 72 Invalid, 442 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 298 Invalid, 0 Unknown, 61 Unchecked, 0.3s Time] [2022-07-21 02:28:49,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-07-21 02:28:49,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 38. [2022-07-21 02:28:49,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.162162162162162) internal successors, (43), 37 states have internal predecessors, (43), 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) [2022-07-21 02:28:49,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2022-07-21 02:28:49,717 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 23 [2022-07-21 02:28:49,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 02:28:49,717 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2022-07-21 02:28:49,717 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.7272727272727273) internal successors, (57), 33 states have internal predecessors, (57), 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) [2022-07-21 02:28:49,717 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2022-07-21 02:28:49,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-07-21 02:28:49,718 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 02:28:49,718 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 02:28:49,738 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-07-21 02:28:49,931 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 02:28:49,931 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 02:28:49,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 02:28:49,932 INFO L85 PathProgramCache]: Analyzing trace with hash 492484807, now seen corresponding path program 3 times [2022-07-21 02:28:49,932 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 02:28:49,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [7730913] [2022-07-21 02:28:49,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 02:28:49,932 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 02:28:49,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 02:28:50,020 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-07-21 02:28:50,020 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 02:28:50,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [7730913] [2022-07-21 02:28:50,020 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [7730913] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 02:28:50,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [815365623] [2022-07-21 02:28:50,020 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-21 02:28:50,020 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 02:28:50,021 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 02:28:50,022 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) [2022-07-21 02:28:50,022 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-07-21 02:28:50,077 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-07-21 02:28:50,077 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 02:28:50,078 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 9 conjunts are in the unsatisfiable core [2022-07-21 02:28:50,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 02:28:50,111 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-07-21 02:28:50,111 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 02:28:50,140 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-07-21 02:28:50,141 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [815365623] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 02:28:50,141 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 02:28:50,141 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 11 [2022-07-21 02:28:50,141 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573196107] [2022-07-21 02:28:50,141 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 02:28:50,141 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-07-21 02:28:50,141 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 02:28:50,141 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-07-21 02:28:50,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=66, Unknown=0, NotChecked=0, Total=110 [2022-07-21 02:28:50,142 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 11 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) [2022-07-21 02:28:50,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 02:28:50,202 INFO L93 Difference]: Finished difference Result 75 states and 87 transitions. [2022-07-21 02:28:50,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-07-21 02:28:50,202 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 11 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) Word has length 23 [2022-07-21 02:28:50,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 02:28:50,203 INFO L225 Difference]: With dead ends: 75 [2022-07-21 02:28:50,203 INFO L226 Difference]: Without dead ends: 44 [2022-07-21 02:28:50,203 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=78, Unknown=0, NotChecked=0, Total=132 [2022-07-21 02:28:50,204 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 11 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-21 02:28:50,204 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 34 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-21 02:28:50,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-07-21 02:28:50,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2022-07-21 02:28:50,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.1395348837209303) internal successors, (49), 43 states have internal predecessors, (49), 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) [2022-07-21 02:28:50,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 49 transitions. [2022-07-21 02:28:50,212 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 49 transitions. Word has length 23 [2022-07-21 02:28:50,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 02:28:50,212 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 49 transitions. [2022-07-21 02:28:50,212 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 11 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) [2022-07-21 02:28:50,212 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 49 transitions. [2022-07-21 02:28:50,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-07-21 02:28:50,213 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 02:28:50,213 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 02:28:50,232 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-07-21 02:28:50,432 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 02:28:50,432 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 02:28:50,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 02:28:50,432 INFO L85 PathProgramCache]: Analyzing trace with hash 2015456385, now seen corresponding path program 4 times [2022-07-21 02:28:50,432 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 02:28:50,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1756016580] [2022-07-21 02:28:50,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 02:28:50,433 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 02:28:50,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 02:28:51,071 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-07-21 02:28:51,072 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 02:28:51,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1756016580] [2022-07-21 02:28:51,072 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1756016580] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 02:28:51,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1580576660] [2022-07-21 02:28:51,072 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-07-21 02:28:51,072 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 02:28:51,072 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 02:28:51,073 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) [2022-07-21 02:28:51,074 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-07-21 02:28:51,127 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-07-21 02:28:51,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 02:28:51,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 46 conjunts are in the unsatisfiable core [2022-07-21 02:28:51,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 02:28:51,136 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-07-21 02:28:51,501 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 19 [2022-07-21 02:28:51,670 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-21 02:28:51,675 INFO L356 Elim1Store]: treesize reduction 15, result has 16.7 percent of original size [2022-07-21 02:28:51,675 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 66 treesize of output 23 [2022-07-21 02:28:51,692 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-07-21 02:28:51,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 02:28:51,875 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 02:28:51,876 INFO L390 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 82 treesize of output 78 [2022-07-21 02:28:51,931 INFO L356 Elim1Store]: treesize reduction 26, result has 39.5 percent of original size [2022-07-21 02:28:51,932 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 106 treesize of output 92 [2022-07-21 02:28:51,946 INFO L356 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2022-07-21 02:28:51,946 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 61 treesize of output 1 [2022-07-21 02:28:51,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 02:28:51,954 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 17 [2022-07-21 02:28:51,956 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 02:28:51,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 02:28:51,961 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 02:28:51,961 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 1 [2022-07-21 02:28:51,968 INFO L356 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2022-07-21 02:28:51,968 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 1 [2022-07-21 02:28:51,976 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 02:28:51,977 INFO L390 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 80 treesize of output 76 [2022-07-21 02:28:52,035 INFO L356 Elim1Store]: treesize reduction 25, result has 39.0 percent of original size [2022-07-21 02:28:52,036 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 100 treesize of output 87 [2022-07-21 02:28:52,047 INFO L356 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2022-07-21 02:28:52,047 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 59 treesize of output 1 [2022-07-21 02:28:52,057 INFO L356 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2022-07-21 02:28:52,058 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 1 [2022-07-21 02:28:52,458 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-07-21 02:28:52,458 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1580576660] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 02:28:52,458 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 02:28:52,458 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 16] total 46 [2022-07-21 02:28:52,458 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45350866] [2022-07-21 02:28:52,458 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 02:28:52,459 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-07-21 02:28:52,460 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 02:28:52,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-07-21 02:28:52,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=295, Invalid=1775, Unknown=0, NotChecked=0, Total=2070 [2022-07-21 02:28:52,461 INFO L87 Difference]: Start difference. First operand 44 states and 49 transitions. Second operand has 46 states, 46 states have (on average 1.3695652173913044) internal successors, (63), 46 states have internal predecessors, (63), 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) [2022-07-21 02:28:59,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 02:28:59,992 INFO L93 Difference]: Finished difference Result 166 states and 175 transitions. [2022-07-21 02:28:59,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2022-07-21 02:28:59,993 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.3695652173913044) internal successors, (63), 46 states have internal predecessors, (63), 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 29 [2022-07-21 02:28:59,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 02:28:59,995 INFO L225 Difference]: With dead ends: 166 [2022-07-21 02:28:59,995 INFO L226 Difference]: Without dead ends: 164 [2022-07-21 02:28:59,998 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 29 SyntacticMatches, 5 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3988 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=2422, Invalid=12830, Unknown=0, NotChecked=0, Total=15252 [2022-07-21 02:28:59,999 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 445 mSDsluCounter, 476 mSDsCounter, 0 mSdLazyCounter, 1189 mSolverCounterSat, 511 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 445 SdHoareTripleChecker+Valid, 512 SdHoareTripleChecker+Invalid, 1700 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 511 IncrementalHoareTripleChecker+Valid, 1189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-07-21 02:28:59,999 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [445 Valid, 512 Invalid, 1700 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [511 Valid, 1189 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-07-21 02:28:59,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2022-07-21 02:29:00,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 41. [2022-07-21 02:29:00,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.125) internal successors, (45), 40 states have internal predecessors, (45), 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) [2022-07-21 02:29:00,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2022-07-21 02:29:00,010 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 29 [2022-07-21 02:29:00,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 02:29:00,010 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2022-07-21 02:29:00,010 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.3695652173913044) internal successors, (63), 46 states have internal predecessors, (63), 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) [2022-07-21 02:29:00,011 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2022-07-21 02:29:00,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-07-21 02:29:00,011 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 02:29:00,011 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 02:29:00,031 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-07-21 02:29:00,229 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 02:29:00,229 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 02:29:00,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 02:29:00,230 INFO L85 PathProgramCache]: Analyzing trace with hash 1871551151, now seen corresponding path program 2 times [2022-07-21 02:29:00,230 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 02:29:00,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1008559424] [2022-07-21 02:29:00,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 02:29:00,230 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 02:29:00,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 02:29:00,396 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-07-21 02:29:00,396 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 02:29:00,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1008559424] [2022-07-21 02:29:00,396 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1008559424] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 02:29:00,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1110329432] [2022-07-21 02:29:00,396 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-21 02:29:00,396 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 02:29:00,396 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 02:29:00,397 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) [2022-07-21 02:29:00,398 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-07-21 02:29:00,450 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-21 02:29:00,451 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 02:29:00,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 54 conjunts are in the unsatisfiable core [2022-07-21 02:29:00,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 02:29:00,456 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-07-21 02:29:00,612 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 20 [2022-07-21 02:29:00,696 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 02:29:00,697 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 32 [2022-07-21 02:29:00,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 02:29:00,803 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 32 [2022-07-21 02:29:01,246 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-21 02:29:01,247 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-21 02:29:01,248 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 64 treesize of output 20 [2022-07-21 02:29:01,266 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-07-21 02:29:01,266 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 02:29:01,903 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 02:29:01,903 INFO L390 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 486 treesize of output 458 [2022-07-21 02:29:04,271 INFO L356 Elim1Store]: treesize reduction 8, result has 33.3 percent of original size [2022-07-21 02:29:04,272 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 210 treesize of output 194 [2022-07-21 02:29:04,276 INFO L390 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 7448 treesize of output 7160 [2022-07-21 02:29:09,656 INFO L356 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-07-21 02:29:09,657 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 458 treesize of output 432 [2022-07-21 02:29:09,734 INFO L356 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-07-21 02:29:09,734 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 449 treesize of output 423 [2022-07-21 02:29:09,777 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-21 02:29:09,780 INFO L390 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 201 treesize of output 183 [2022-07-21 02:29:09,855 INFO L356 Elim1Store]: treesize reduction 5, result has 70.6 percent of original size [2022-07-21 02:29:09,855 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 257 treesize of output 232 [2022-07-21 02:29:10,032 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 02:29:10,033 INFO L390 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 486 treesize of output 458 [2022-07-21 02:29:11,597 INFO L356 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-07-21 02:29:11,599 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 2256 treesize of output 1960 [2022-07-21 02:29:13,283 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 02:29:13,283 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 94 treesize of output 82 [2022-07-21 02:29:13,291 INFO L390 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 3720 treesize of output 3576 [2022-07-21 02:29:14,137 INFO L356 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-07-21 02:29:14,137 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 3695 treesize of output 3487 [2022-07-21 02:29:15,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 02:29:15,122 INFO L356 Elim1Store]: treesize reduction 5, result has 70.6 percent of original size [2022-07-21 02:29:15,122 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 2352 treesize of output 1972 [2022-07-21 02:29:15,393 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 02:29:15,393 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 28 [2022-07-21 02:29:15,396 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 02:29:15,396 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-21 02:29:15,396 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-21 02:29:15,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 02:29:15,423 INFO L356 Elim1Store]: treesize reduction 5, result has 70.6 percent of original size [2022-07-21 02:29:15,423 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 4045 treesize of output 3561 [2022-07-21 02:29:16,033 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 02:29:16,034 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 69 treesize of output 57 [2022-07-21 02:29:16,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 02:29:16,038 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-21 02:29:16,038 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-21 02:29:16,051 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-21 02:29:16,057 INFO L356 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-07-21 02:29:16,057 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 203 treesize of output 177 [2022-07-21 02:29:16,943 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-07-21 02:29:16,943 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1110329432] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 02:29:16,943 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 02:29:16,943 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 19, 19] total 42 [2022-07-21 02:29:16,943 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115023370] [2022-07-21 02:29:16,943 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 02:29:16,944 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-07-21 02:29:16,944 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 02:29:16,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-07-21 02:29:16,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=1523, Unknown=0, NotChecked=0, Total=1722 [2022-07-21 02:29:16,945 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 42 states, 42 states have (on average 1.6904761904761905) internal successors, (71), 42 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) [2022-07-21 02:29:52,696 WARN L233 SmtUtils]: Spent 35.02s on a formula simplification. DAG size of input: 131 DAG size of output: 78 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-07-21 02:30:06,985 WARN L233 SmtUtils]: Spent 14.20s on a formula simplification. DAG size of input: 129 DAG size of output: 77 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-07-21 02:30:15,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 02:30:15,994 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2022-07-21 02:30:15,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-07-21 02:30:15,995 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.6904761904761905) internal successors, (71), 42 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 35 [2022-07-21 02:30:15,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 02:30:15,995 INFO L225 Difference]: With dead ends: 82 [2022-07-21 02:30:15,995 INFO L226 Difference]: Without dead ends: 69 [2022-07-21 02:30:15,996 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 855 ImplicationChecksByTransitivity, 60.0s TimeCoverageRelationStatistics Valid=488, Invalid=3544, Unknown=0, NotChecked=0, Total=4032 [2022-07-21 02:30:15,996 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 75 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 396 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 565 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 396 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 95 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-21 02:30:15,997 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 96 Invalid, 565 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 396 Invalid, 0 Unknown, 95 Unchecked, 0.3s Time] [2022-07-21 02:30:15,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-07-21 02:30:16,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 54. [2022-07-21 02:30:16,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.1132075471698113) internal successors, (59), 53 states have internal predecessors, (59), 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) [2022-07-21 02:30:16,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 59 transitions. [2022-07-21 02:30:16,019 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 59 transitions. Word has length 35 [2022-07-21 02:30:16,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 02:30:16,020 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 59 transitions. [2022-07-21 02:30:16,020 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.6904761904761905) internal successors, (71), 42 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) [2022-07-21 02:30:16,020 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 59 transitions. [2022-07-21 02:30:16,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-07-21 02:30:16,023 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 02:30:16,023 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 02:30:16,042 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-07-21 02:30:16,227 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 02:30:16,227 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 02:30:16,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 02:30:16,228 INFO L85 PathProgramCache]: Analyzing trace with hash -891416107, now seen corresponding path program 3 times [2022-07-21 02:30:16,228 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 02:30:16,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [147063395] [2022-07-21 02:30:16,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 02:30:16,228 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 02:30:16,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 02:30:16,378 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 27 proven. 9 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-07-21 02:30:16,378 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 02:30:16,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [147063395] [2022-07-21 02:30:16,378 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [147063395] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 02:30:16,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1699024389] [2022-07-21 02:30:16,378 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-21 02:30:16,378 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 02:30:16,379 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 02:30:16,380 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) [2022-07-21 02:30:16,380 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-07-21 02:30:16,572 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-07-21 02:30:16,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 02:30:16,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 20 conjunts are in the unsatisfiable core [2022-07-21 02:30:16,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 02:30:16,700 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 32 proven. 28 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-07-21 02:30:16,700 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 02:30:16,784 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 36 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-07-21 02:30:16,784 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1699024389] provided 1 perfect and 1 imperfect interpolant sequences [2022-07-21 02:30:16,784 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-07-21 02:30:16,784 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [9, 14] total 22 [2022-07-21 02:30:16,785 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [89349399] [2022-07-21 02:30:16,785 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 02:30:16,785 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-07-21 02:30:16,785 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 02:30:16,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-07-21 02:30:16,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=330, Unknown=0, NotChecked=0, Total=462 [2022-07-21 02:30:16,786 INFO L87 Difference]: Start difference. First operand 54 states and 59 transitions. Second operand has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 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) [2022-07-21 02:30:16,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 02:30:16,916 INFO L93 Difference]: Finished difference Result 79 states and 84 transitions. [2022-07-21 02:30:16,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-21 02:30:16,916 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 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) Word has length 35 [2022-07-21 02:30:16,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 02:30:16,917 INFO L225 Difference]: With dead ends: 79 [2022-07-21 02:30:16,917 INFO L226 Difference]: Without dead ends: 57 [2022-07-21 02:30:16,917 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 53 SyntacticMatches, 5 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 359 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=201, Invalid=555, Unknown=0, NotChecked=0, Total=756 [2022-07-21 02:30:16,918 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 67 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-21 02:30:16,918 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 31 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-21 02:30:16,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-07-21 02:30:16,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 42. [2022-07-21 02:30:16,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.048780487804878) internal successors, (43), 41 states have internal predecessors, (43), 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) [2022-07-21 02:30:16,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2022-07-21 02:30:16,930 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 35 [2022-07-21 02:30:16,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 02:30:16,930 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2022-07-21 02:30:16,930 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 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) [2022-07-21 02:30:16,930 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2022-07-21 02:30:16,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-07-21 02:30:16,931 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 02:30:16,931 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 02:30:16,948 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-07-21 02:30:17,147 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 02:30:17,148 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 02:30:17,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 02:30:17,148 INFO L85 PathProgramCache]: Analyzing trace with hash -1950301565, now seen corresponding path program 4 times [2022-07-21 02:30:17,149 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 02:30:17,149 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1023933531] [2022-07-21 02:30:17,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 02:30:17,149 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 02:30:17,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 02:30:18,089 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 43 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-07-21 02:30:18,090 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 02:30:18,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1023933531] [2022-07-21 02:30:18,090 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1023933531] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 02:30:18,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2141269834] [2022-07-21 02:30:18,090 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-07-21 02:30:18,090 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 02:30:18,090 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 02:30:18,091 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) [2022-07-21 02:30:18,092 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-07-21 02:30:18,156 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-07-21 02:30:18,156 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 02:30:18,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 75 conjunts are in the unsatisfiable core [2022-07-21 02:30:18,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 02:30:18,164 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-07-21 02:30:18,344 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2022-07-21 02:30:18,497 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-07-21 02:30:18,661 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-07-21 02:30:18,817 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-07-21 02:30:19,249 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-21 02:30:19,250 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-21 02:30:19,250 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 20 [2022-07-21 02:30:19,272 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-07-21 02:30:19,272 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 02:30:21,053 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 02:30:21,054 INFO L390 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 9152 treesize of output 8616 [2022-07-21 02:30:21,081 WARN L319 FreeRefinementEngine]: Global settings require throwing the following exception [2022-07-21 02:30:21,098 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-07-21 02:30:21,291 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-07-21 02:30:21,292 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.ArithmeticException: BigInteger out of long range at java.base/java.math.BigInteger.longValueExact(BigInteger.java:4765) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.computeDerApplicabilityScore(QuantifierPusher.java:545) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.selectBestEliminatee(QuantifierPusher.java:528) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPushUtilsForSubsetPush.sequentialSubsetPush(QuantifierPushUtilsForSubsetPush.java:139) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.tryToPushOverDualFiniteConnective(QuantifierPusher.java:348) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPushTermWalker.convert(QuantifierPushTermWalker.java:176) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPushTermWalker.convert(QuantifierPushTermWalker.java:1) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.TermContextTransformationEngine$ApplicationTermTask.doStep(TermContextTransformationEngine.java:169) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.TermContextTransformationEngine.transform(TermContextTransformationEngine.java:77) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.TermContextTransformationEngine.transform(TermContextTransformationEngine.java:61) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPushTermWalker.eliminate(QuantifierPushTermWalker.java:265) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPushTermWalker.eliminate(QuantifierPushTermWalker.java:251) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.PartialQuantifierElimination.eliminate(PartialQuantifierElimination.java:90) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer$QuantifierEliminationPostprocessor.postprocess(IterativePredicateTransformer.java:238) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer.applyPostprocessors(IterativePredicateTransformer.java:420) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer.computeBackwardSequence(IterativePredicateTransformer.java:399) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer.computeWeakestPreconditionSequence(IterativePredicateTransformer.java:271) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.computeInterpolantsUsingUnsatCore(TraceCheckSpWp.java:342) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.computeInterpolants(TraceCheckSpWp.java:185) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.(TraceCheckSpWp.java:163) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSpWp.construct(IpTcStrategyModuleSpWp.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSpWp.construct(IpTcStrategyModuleSpWp.java:1) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:248) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:409) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:300) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:260) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:152) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-07-21 02:30:21,296 INFO L158 Benchmark]: Toolchain (without parser) took 103842.82ms. Allocated memory was 54.5MB in the beginning and 446.7MB in the end (delta: 392.2MB). Free memory was 31.6MB in the beginning and 410.6MB in the end (delta: -378.9MB). Peak memory consumption was 267.6MB. Max. memory is 16.1GB. [2022-07-21 02:30:21,297 INFO L158 Benchmark]: CDTParser took 0.10ms. Allocated memory is still 54.5MB. Free memory was 36.6MB in the beginning and 36.5MB in the end (delta: 26.0kB). There was no memory consumed. Max. memory is 16.1GB. [2022-07-21 02:30:21,297 INFO L158 Benchmark]: CACSL2BoogieTranslator took 242.75ms. Allocated memory was 54.5MB in the beginning and 69.2MB in the end (delta: 14.7MB). Free memory was 31.4MB in the beginning and 52.7MB in the end (delta: -21.3MB). Peak memory consumption was 5.3MB. Max. memory is 16.1GB. [2022-07-21 02:30:21,297 INFO L158 Benchmark]: Boogie Procedure Inliner took 36.26ms. Allocated memory is still 69.2MB. Free memory was 52.5MB in the beginning and 51.0MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-07-21 02:30:21,297 INFO L158 Benchmark]: Boogie Preprocessor took 31.82ms. Allocated memory is still 69.2MB. Free memory was 51.0MB in the beginning and 49.9MB in the end (delta: 1.1MB). There was no memory consumed. Max. memory is 16.1GB. [2022-07-21 02:30:21,297 INFO L158 Benchmark]: RCFGBuilder took 215.14ms. Allocated memory is still 69.2MB. Free memory was 49.7MB in the beginning and 39.5MB in the end (delta: 10.3MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2022-07-21 02:30:21,298 INFO L158 Benchmark]: TraceAbstraction took 103310.62ms. Allocated memory was 69.2MB in the beginning and 446.7MB in the end (delta: 377.5MB). Free memory was 39.1MB in the beginning and 410.6MB in the end (delta: -371.5MB). Peak memory consumption was 260.2MB. Max. memory is 16.1GB. [2022-07-21 02:30:21,298 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10ms. Allocated memory is still 54.5MB. Free memory was 36.6MB in the beginning and 36.5MB in the end (delta: 26.0kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 242.75ms. Allocated memory was 54.5MB in the beginning and 69.2MB in the end (delta: 14.7MB). Free memory was 31.4MB in the beginning and 52.7MB in the end (delta: -21.3MB). Peak memory consumption was 5.3MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 36.26ms. Allocated memory is still 69.2MB. Free memory was 52.5MB in the beginning and 51.0MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 31.82ms. Allocated memory is still 69.2MB. Free memory was 51.0MB in the beginning and 49.9MB in the end (delta: 1.1MB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 215.14ms. Allocated memory is still 69.2MB. Free memory was 49.7MB in the beginning and 39.5MB in the end (delta: 10.3MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * TraceAbstraction took 103310.62ms. Allocated memory was 69.2MB in the beginning and 446.7MB in the end (delta: 377.5MB). Free memory was 39.1MB in the beginning and 410.6MB in the end (delta: -371.5MB). Peak memory consumption was 260.2MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: ArithmeticException: BigInteger out of long range de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: ArithmeticException: BigInteger out of long range: java.base/java.math.BigInteger.longValueExact(BigInteger.java:4765) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2022-07-21 02:30:21,315 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/loops/invert_string-3.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Bitvector.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 ca98535e808a51f7cfa7d21c9d33f259821212a6554e27f29c2bddd9197c0249 --- Real Ultimate output --- This is Ultimate 0.2.2-?-3598765 [2022-07-21 02:30:22,925 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-21 02:30:22,927 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-21 02:30:22,957 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-21 02:30:22,957 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-21 02:30:22,958 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-21 02:30:22,961 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-21 02:30:22,963 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-21 02:30:22,965 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-21 02:30:22,968 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-21 02:30:22,969 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-21 02:30:22,972 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-21 02:30:22,972 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-21 02:30:22,973 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-21 02:30:22,974 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-21 02:30:22,976 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-21 02:30:22,977 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-21 02:30:22,978 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-21 02:30:22,979 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-21 02:30:22,983 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-21 02:30:22,983 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-21 02:30:22,984 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-21 02:30:22,986 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-21 02:30:22,986 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-21 02:30:22,987 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-21 02:30:22,992 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-21 02:30:22,992 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-21 02:30:22,992 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-21 02:30:22,993 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-21 02:30:22,993 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-21 02:30:22,994 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-21 02:30:22,994 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-21 02:30:22,995 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-21 02:30:22,996 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-21 02:30:22,997 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-21 02:30:22,997 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-21 02:30:22,997 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-21 02:30:22,998 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-21 02:30:22,998 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-21 02:30:22,998 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-21 02:30:22,998 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-21 02:30:22,999 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-21 02:30:23,005 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Bitvector.epf [2022-07-21 02:30:23,023 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-21 02:30:23,023 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-21 02:30:23,024 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-21 02:30:23,024 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-21 02:30:23,024 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-07-21 02:30:23,024 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-07-21 02:30:23,025 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-21 02:30:23,025 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-21 02:30:23,025 INFO L138 SettingsManager]: * Use SBE=true [2022-07-21 02:30:23,026 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-21 02:30:23,026 INFO L138 SettingsManager]: * sizeof long=4 [2022-07-21 02:30:23,026 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-07-21 02:30:23,031 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-21 02:30:23,031 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-07-21 02:30:23,031 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-07-21 02:30:23,031 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-07-21 02:30:23,031 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-07-21 02:30:23,032 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2022-07-21 02:30:23,032 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2022-07-21 02:30:23,032 INFO L138 SettingsManager]: * sizeof long double=12 [2022-07-21 02:30:23,032 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-07-21 02:30:23,032 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-21 02:30:23,032 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-07-21 02:30:23,032 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-21 02:30:23,033 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-21 02:30:23,033 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-07-21 02:30:23,033 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-21 02:30:23,033 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-21 02:30:23,033 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-07-21 02:30:23,033 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-07-21 02:30:23,034 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2022-07-21 02:30:23,034 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2022-07-21 02:30:23,034 INFO L138 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2022-07-21 02:30:23,034 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-07-21 02:30:23,034 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-07-21 02:30:23,035 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-07-21 02:30:23,035 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ca98535e808a51f7cfa7d21c9d33f259821212a6554e27f29c2bddd9197c0249 [2022-07-21 02:30:23,281 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-21 02:30:23,300 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-21 02:30:23,302 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-21 02:30:23,303 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-21 02:30:23,304 INFO L275 PluginConnector]: CDTParser initialized [2022-07-21 02:30:23,304 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops/invert_string-3.c [2022-07-21 02:30:23,353 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/be2909ffd/a00776efc64940db91ccce5ecccd6a15/FLAG7969a6603 [2022-07-21 02:30:23,708 INFO L306 CDTParser]: Found 1 translation units. [2022-07-21 02:30:23,709 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops/invert_string-3.c [2022-07-21 02:30:23,713 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/be2909ffd/a00776efc64940db91ccce5ecccd6a15/FLAG7969a6603 [2022-07-21 02:30:23,725 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/be2909ffd/a00776efc64940db91ccce5ecccd6a15 [2022-07-21 02:30:23,727 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-21 02:30:23,728 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-21 02:30:23,729 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-21 02:30:23,730 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-21 02:30:23,732 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-21 02:30:23,732 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:30:23" (1/1) ... [2022-07-21 02:30:23,733 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@62236c66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:30:23, skipping insertion in model container [2022-07-21 02:30:23,733 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:30:23" (1/1) ... [2022-07-21 02:30:23,740 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-21 02:30:23,748 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-21 02:30:23,830 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/loops/invert_string-3.c[327,340] [2022-07-21 02:30:23,840 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-21 02:30:23,846 INFO L203 MainTranslator]: Completed pre-run [2022-07-21 02:30:23,859 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/loops/invert_string-3.c[327,340] [2022-07-21 02:30:23,874 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-21 02:30:23,892 INFO L208 MainTranslator]: Completed translation [2022-07-21 02:30:23,893 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:30:23 WrapperNode [2022-07-21 02:30:23,893 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-21 02:30:23,894 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-07-21 02:30:23,894 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-07-21 02:30:23,894 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-07-21 02:30:23,899 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:30:23" (1/1) ... [2022-07-21 02:30:23,910 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:30:23" (1/1) ... [2022-07-21 02:30:23,927 INFO L137 Inliner]: procedures = 14, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 68 [2022-07-21 02:30:23,927 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-07-21 02:30:23,928 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-07-21 02:30:23,928 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-07-21 02:30:23,928 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-07-21 02:30:23,934 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:30:23" (1/1) ... [2022-07-21 02:30:23,934 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:30:23" (1/1) ... [2022-07-21 02:30:23,944 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:30:23" (1/1) ... [2022-07-21 02:30:23,944 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:30:23" (1/1) ... [2022-07-21 02:30:23,955 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:30:23" (1/1) ... [2022-07-21 02:30:23,958 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:30:23" (1/1) ... [2022-07-21 02:30:23,964 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:30:23" (1/1) ... [2022-07-21 02:30:23,966 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-07-21 02:30:23,968 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-07-21 02:30:23,969 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-07-21 02:30:23,970 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-07-21 02:30:23,970 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:30:23" (1/1) ... [2022-07-21 02:30:23,975 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-21 02:30:23,981 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 02:30:23,992 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) [2022-07-21 02:30:24,010 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 [2022-07-21 02:30:24,022 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-07-21 02:30:24,022 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2022-07-21 02:30:24,022 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2022-07-21 02:30:24,022 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-07-21 02:30:24,023 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-07-21 02:30:24,023 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-07-21 02:30:24,023 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2022-07-21 02:30:24,023 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-07-21 02:30:24,084 INFO L234 CfgBuilder]: Building ICFG [2022-07-21 02:30:24,086 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-07-21 02:30:24,224 INFO L275 CfgBuilder]: Performing block encoding [2022-07-21 02:30:24,228 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-07-21 02:30:24,228 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2022-07-21 02:30:24,229 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:30:24 BoogieIcfgContainer [2022-07-21 02:30:24,229 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-07-21 02:30:24,230 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-07-21 02:30:24,231 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-07-21 02:30:24,232 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-07-21 02:30:24,232 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 02:30:23" (1/3) ... [2022-07-21 02:30:24,233 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@629b49cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:30:24, skipping insertion in model container [2022-07-21 02:30:24,233 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:30:23" (2/3) ... [2022-07-21 02:30:24,233 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@629b49cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:30:24, skipping insertion in model container [2022-07-21 02:30:24,233 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:30:24" (3/3) ... [2022-07-21 02:30:24,234 INFO L111 eAbstractionObserver]: Analyzing ICFG invert_string-3.c [2022-07-21 02:30:24,269 INFO L201 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-07-21 02:30:24,270 INFO L160 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-07-21 02:30:24,309 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-21 02:30:24,323 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@3488d387, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@14122c67 [2022-07-21 02:30:24,324 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-07-21 02:30:24,329 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 16 states have (on average 1.5) internal successors, (24), 17 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) [2022-07-21 02:30:24,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-07-21 02:30:24,334 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 02:30:24,334 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 02:30:24,335 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 02:30:24,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 02:30:24,340 INFO L85 PathProgramCache]: Analyzing trace with hash -2016449835, now seen corresponding path program 1 times [2022-07-21 02:30:24,349 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 02:30:24,350 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1168183695] [2022-07-21 02:30:24,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 02:30:24,351 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 02:30:24,351 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 02:30:24,353 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 02:30:24,354 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2022-07-21 02:30:24,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 02:30:24,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 3 conjunts are in the unsatisfiable core [2022-07-21 02:30:24,443 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 02:30:24,500 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 02:30:24,501 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 02:30:24,501 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 02:30:24,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1168183695] [2022-07-21 02:30:24,502 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1168183695] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 02:30:24,502 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 02:30:24,503 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-21 02:30:24,504 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [473285756] [2022-07-21 02:30:24,504 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 02:30:24,507 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-21 02:30:24,508 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 02:30:24,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-21 02:30:24,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-21 02:30:24,529 INFO L87 Difference]: Start difference. First operand has 18 states, 16 states have (on average 1.5) internal successors, (24), 17 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) Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 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) [2022-07-21 02:30:24,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 02:30:24,562 INFO L93 Difference]: Finished difference Result 34 states and 46 transitions. [2022-07-21 02:30:24,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-21 02:30:24,564 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 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 9 [2022-07-21 02:30:24,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 02:30:24,573 INFO L225 Difference]: With dead ends: 34 [2022-07-21 02:30:24,573 INFO L226 Difference]: Without dead ends: 16 [2022-07-21 02:30:24,575 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-21 02:30:24,577 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 1 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-21 02:30:24,579 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 26 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-21 02:30:24,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-07-21 02:30:24,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2022-07-21 02:30:24,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 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) [2022-07-21 02:30:24,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2022-07-21 02:30:24,601 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2022-07-21 02:30:24,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 02:30:24,602 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2022-07-21 02:30:24,603 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 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) [2022-07-21 02:30:24,603 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2022-07-21 02:30:24,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-07-21 02:30:24,603 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 02:30:24,603 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 02:30:24,615 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2022-07-21 02:30:24,812 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 02:30:24,813 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 02:30:24,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 02:30:24,813 INFO L85 PathProgramCache]: Analyzing trace with hash 1564645395, now seen corresponding path program 1 times [2022-07-21 02:30:24,814 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 02:30:24,814 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1556447756] [2022-07-21 02:30:24,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 02:30:24,814 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 02:30:24,814 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 02:30:24,815 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 02:30:24,816 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2022-07-21 02:30:24,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 02:30:24,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 4 conjunts are in the unsatisfiable core [2022-07-21 02:30:24,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 02:30:24,875 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 02:30:24,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 02:30:24,917 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 02:30:24,917 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 02:30:24,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1556447756] [2022-07-21 02:30:24,917 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1556447756] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 02:30:24,917 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 02:30:24,918 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2022-07-21 02:30:24,918 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1949266159] [2022-07-21 02:30:24,918 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 02:30:24,919 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-07-21 02:30:24,919 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 02:30:24,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-07-21 02:30:24,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2022-07-21 02:30:24,919 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 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) [2022-07-21 02:30:24,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 02:30:24,986 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2022-07-21 02:30:24,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-21 02:30:24,986 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-07-21 02:30:24,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 02:30:24,987 INFO L225 Difference]: With dead ends: 31 [2022-07-21 02:30:24,987 INFO L226 Difference]: Without dead ends: 21 [2022-07-21 02:30:24,987 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2022-07-21 02:30:24,988 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 9 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-21 02:30:24,988 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 19 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-21 02:30:24,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-07-21 02:30:24,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-07-21 02:30:24,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 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) [2022-07-21 02:30:24,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2022-07-21 02:30:24,992 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 11 [2022-07-21 02:30:24,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 02:30:24,992 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2022-07-21 02:30:24,992 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 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) [2022-07-21 02:30:24,992 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2022-07-21 02:30:24,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-07-21 02:30:24,993 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 02:30:24,993 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 02:30:25,001 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2022-07-21 02:30:25,201 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 02:30:25,202 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 02:30:25,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 02:30:25,202 INFO L85 PathProgramCache]: Analyzing trace with hash -8547635, now seen corresponding path program 2 times [2022-07-21 02:30:25,202 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 02:30:25,203 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1304395247] [2022-07-21 02:30:25,203 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-21 02:30:25,203 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 02:30:25,203 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 02:30:25,204 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 02:30:25,206 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2022-07-21 02:30:25,234 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-07-21 02:30:25,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 02:30:25,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 3 conjunts are in the unsatisfiable core [2022-07-21 02:30:25,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 02:30:25,262 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-07-21 02:30:25,262 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 02:30:25,262 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 02:30:25,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1304395247] [2022-07-21 02:30:25,263 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1304395247] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 02:30:25,263 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 02:30:25,263 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-07-21 02:30:25,263 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1402328942] [2022-07-21 02:30:25,263 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 02:30:25,264 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-07-21 02:30:25,264 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 02:30:25,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-07-21 02:30:25,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-07-21 02:30:25,265 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 02:30:25,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 02:30:25,291 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2022-07-21 02:30:25,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-07-21 02:30:25,292 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2022-07-21 02:30:25,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 02:30:25,293 INFO L225 Difference]: With dead ends: 30 [2022-07-21 02:30:25,293 INFO L226 Difference]: Without dead ends: 23 [2022-07-21 02:30:25,293 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-07-21 02:30:25,294 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 13 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-21 02:30:25,294 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 15 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-21 02:30:25,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-07-21 02:30:25,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2022-07-21 02:30:25,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 21 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) [2022-07-21 02:30:25,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2022-07-21 02:30:25,297 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 17 [2022-07-21 02:30:25,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 02:30:25,298 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2022-07-21 02:30:25,298 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 02:30:25,298 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2022-07-21 02:30:25,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-07-21 02:30:25,299 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 02:30:25,299 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 02:30:25,319 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2022-07-21 02:30:25,507 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 02:30:25,507 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 02:30:25,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 02:30:25,508 INFO L85 PathProgramCache]: Analyzing trace with hash 2021040587, now seen corresponding path program 1 times [2022-07-21 02:30:25,508 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 02:30:25,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [403051719] [2022-07-21 02:30:25,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 02:30:25,509 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 02:30:25,509 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 02:30:25,510 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 02:30:25,511 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2022-07-21 02:30:25,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 02:30:25,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2022-07-21 02:30:25,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 02:30:25,661 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-21 02:30:25,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 02:30:25,788 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-21 02:30:25,789 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 02:30:25,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [403051719] [2022-07-21 02:30:25,789 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [403051719] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 02:30:25,789 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 02:30:25,789 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2022-07-21 02:30:25,789 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1530152278] [2022-07-21 02:30:25,789 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 02:30:25,790 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-07-21 02:30:25,790 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 02:30:25,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-07-21 02:30:25,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2022-07-21 02:30:25,791 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 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) [2022-07-21 02:30:25,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 02:30:25,906 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2022-07-21 02:30:25,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-07-21 02:30:25,907 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 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 19 [2022-07-21 02:30:25,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 02:30:25,908 INFO L225 Difference]: With dead ends: 36 [2022-07-21 02:30:25,908 INFO L226 Difference]: Without dead ends: 25 [2022-07-21 02:30:25,908 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2022-07-21 02:30:25,909 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 10 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-21 02:30:25,909 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 47 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 114 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-21 02:30:25,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-07-21 02:30:25,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2022-07-21 02:30:25,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 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) [2022-07-21 02:30:25,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2022-07-21 02:30:25,912 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 19 [2022-07-21 02:30:25,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 02:30:25,912 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2022-07-21 02:30:25,912 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 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) [2022-07-21 02:30:25,912 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2022-07-21 02:30:25,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-07-21 02:30:25,913 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 02:30:25,913 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 02:30:25,925 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2022-07-21 02:30:26,122 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 02:30:26,122 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 02:30:26,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 02:30:26,123 INFO L85 PathProgramCache]: Analyzing trace with hash -1661412983, now seen corresponding path program 2 times [2022-07-21 02:30:26,123 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 02:30:26,123 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1059738424] [2022-07-21 02:30:26,123 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-21 02:30:26,123 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 02:30:26,123 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 02:30:26,124 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 02:30:26,126 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2022-07-21 02:30:26,176 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-21 02:30:26,176 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 02:30:26,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 4 conjunts are in the unsatisfiable core [2022-07-21 02:30:26,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 02:30:26,208 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-07-21 02:30:26,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 02:30:26,282 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-07-21 02:30:26,282 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 02:30:26,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1059738424] [2022-07-21 02:30:26,282 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1059738424] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 02:30:26,282 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 02:30:26,282 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2022-07-21 02:30:26,282 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231402112] [2022-07-21 02:30:26,282 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 02:30:26,283 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-07-21 02:30:26,283 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 02:30:26,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-07-21 02:30:26,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2022-07-21 02:30:26,283 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 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) [2022-07-21 02:30:26,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 02:30:26,404 INFO L93 Difference]: Finished difference Result 43 states and 48 transitions. [2022-07-21 02:30:26,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-07-21 02:30:26,406 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 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) Word has length 21 [2022-07-21 02:30:26,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 02:30:26,406 INFO L225 Difference]: With dead ends: 43 [2022-07-21 02:30:26,406 INFO L226 Difference]: Without dead ends: 36 [2022-07-21 02:30:26,407 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=56, Invalid=100, Unknown=0, NotChecked=0, Total=156 [2022-07-21 02:30:26,407 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 31 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-21 02:30:26,408 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 35 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-21 02:30:26,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-07-21 02:30:26,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2022-07-21 02:30:26,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.103448275862069) internal successors, (32), 29 states have internal predecessors, (32), 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) [2022-07-21 02:30:26,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2022-07-21 02:30:26,411 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 21 [2022-07-21 02:30:26,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 02:30:26,412 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2022-07-21 02:30:26,412 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 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) [2022-07-21 02:30:26,412 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2022-07-21 02:30:26,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-07-21 02:30:26,412 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 02:30:26,412 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 02:30:26,421 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2022-07-21 02:30:26,621 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 02:30:26,622 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 02:30:26,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 02:30:26,622 INFO L85 PathProgramCache]: Analyzing trace with hash -509111549, now seen corresponding path program 3 times [2022-07-21 02:30:26,623 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 02:30:26,623 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1992323965] [2022-07-21 02:30:26,623 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-21 02:30:26,623 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 02:30:26,623 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 02:30:26,624 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 02:30:26,626 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2022-07-21 02:30:26,704 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-07-21 02:30:26,704 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 02:30:26,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 8 conjunts are in the unsatisfiable core [2022-07-21 02:30:26,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 02:30:26,772 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-07-21 02:30:26,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 02:30:27,017 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-07-21 02:30:27,017 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 02:30:27,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1992323965] [2022-07-21 02:30:27,017 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1992323965] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 02:30:27,017 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 02:30:27,018 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 15 [2022-07-21 02:30:27,018 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781342688] [2022-07-21 02:30:27,018 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 02:30:27,018 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-07-21 02:30:27,018 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 02:30:27,019 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-07-21 02:30:27,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2022-07-21 02:30:27,019 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 15 states, 15 states have (on average 2.2) internal successors, (33), 15 states have internal predecessors, (33), 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) [2022-07-21 02:30:27,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 02:30:27,427 INFO L93 Difference]: Finished difference Result 74 states and 82 transitions. [2022-07-21 02:30:27,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-07-21 02:30:27,428 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.2) internal successors, (33), 15 states have internal predecessors, (33), 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 27 [2022-07-21 02:30:27,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 02:30:27,428 INFO L225 Difference]: With dead ends: 74 [2022-07-21 02:30:27,428 INFO L226 Difference]: Without dead ends: 67 [2022-07-21 02:30:27,429 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=178, Invalid=472, Unknown=0, NotChecked=0, Total=650 [2022-07-21 02:30:27,429 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 226 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 254 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 02:30:27,429 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [226 Valid, 89 Invalid, 254 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-21 02:30:27,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-07-21 02:30:27,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 42. [2022-07-21 02:30:27,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.0975609756097562) internal successors, (45), 41 states have internal predecessors, (45), 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) [2022-07-21 02:30:27,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2022-07-21 02:30:27,435 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 27 [2022-07-21 02:30:27,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 02:30:27,435 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2022-07-21 02:30:27,436 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.2) internal successors, (33), 15 states have internal predecessors, (33), 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) [2022-07-21 02:30:27,436 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2022-07-21 02:30:27,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-07-21 02:30:27,436 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 02:30:27,436 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 02:30:27,445 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2022-07-21 02:30:27,643 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 02:30:27,643 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 02:30:27,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 02:30:27,644 INFO L85 PathProgramCache]: Analyzing trace with hash 2015456385, now seen corresponding path program 4 times [2022-07-21 02:30:27,644 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 02:30:27,644 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [839732708] [2022-07-21 02:30:27,644 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-07-21 02:30:27,644 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 02:30:27,645 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 02:30:27,645 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 02:30:27,647 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2022-07-21 02:30:27,727 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-07-21 02:30:27,727 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 02:30:27,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 32 conjunts are in the unsatisfiable core [2022-07-21 02:30:27,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 02:30:27,766 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-07-21 02:30:28,146 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 02:30:28,223 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 22 [2022-07-21 02:30:28,328 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 30 [2022-07-21 02:30:28,351 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-21 02:30:28,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 02:30:28,644 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 02:30:28,644 INFO L390 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 174 treesize of output 156 [2022-07-21 02:30:28,682 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 02:30:28,682 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 315 treesize of output 298 [2022-07-21 02:32:51,332 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-07-21 02:32:51,333 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 02:32:51,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [839732708] [2022-07-21 02:32:51,333 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [839732708] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 02:32:51,333 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 02:32:51,333 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 15] total 32 [2022-07-21 02:32:51,333 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [650519124] [2022-07-21 02:32:51,334 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 02:32:51,334 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-07-21 02:32:51,334 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 02:32:51,334 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-07-21 02:32:51,335 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=883, Unknown=0, NotChecked=0, Total=992 [2022-07-21 02:32:51,335 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand has 32 states, 32 states have (on average 1.5) internal successors, (48), 32 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) [2022-07-21 02:32:53,919 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-07-21 02:32:55,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 02:32:55,256 INFO L93 Difference]: Finished difference Result 97 states and 100 transitions. [2022-07-21 02:32:55,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-07-21 02:32:55,257 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.5) internal successors, (48), 32 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) Word has length 29 [2022-07-21 02:32:55,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 02:32:55,258 INFO L225 Difference]: With dead ends: 97 [2022-07-21 02:32:55,258 INFO L226 Difference]: Without dead ends: 95 [2022-07-21 02:32:55,259 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 574 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=317, Invalid=2335, Unknown=0, NotChecked=0, Total=2652 [2022-07-21 02:32:55,259 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 125 mSDsluCounter, 239 mSDsCounter, 0 mSdLazyCounter, 725 mSolverCounterSat, 100 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 255 SdHoareTripleChecker+Invalid, 826 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 725 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2022-07-21 02:32:55,259 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [125 Valid, 255 Invalid, 826 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 725 Invalid, 1 Unknown, 0 Unchecked, 2.9s Time] [2022-07-21 02:32:55,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-07-21 02:32:55,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 45. [2022-07-21 02:32:55,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.0909090909090908) internal successors, (48), 44 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) [2022-07-21 02:32:55,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2022-07-21 02:32:55,266 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 29 [2022-07-21 02:32:55,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 02:32:55,267 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2022-07-21 02:32:55,267 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.5) internal successors, (48), 32 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) [2022-07-21 02:32:55,267 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2022-07-21 02:32:55,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-07-21 02:32:55,268 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 02:32:55,268 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 02:32:55,279 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2022-07-21 02:32:55,471 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 02:32:55,472 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 02:32:55,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 02:32:55,472 INFO L85 PathProgramCache]: Analyzing trace with hash -2120626473, now seen corresponding path program 1 times [2022-07-21 02:32:55,472 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 02:32:55,472 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [836168729] [2022-07-21 02:32:55,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 02:32:55,473 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 02:32:55,473 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 02:32:55,474 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 02:32:55,474 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2022-07-21 02:32:55,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 02:32:55,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 32 conjunts are in the unsatisfiable core [2022-07-21 02:32:55,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 02:32:55,600 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-07-21 02:32:55,971 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 22 [2022-07-21 02:32:56,033 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 02:32:56,034 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 34 [2022-07-21 02:32:56,245 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 30 [2022-07-21 02:32:56,267 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-07-21 02:32:56,267 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 02:32:56,625 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 02:32:56,626 INFO L390 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 228 treesize of output 216 [2022-07-21 02:32:57,244 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 02:32:57,244 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 84 treesize of output 84 [2022-07-21 02:32:57,249 INFO L390 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 403 treesize of output 383 [2022-07-21 02:33:01,397 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 02:33:01,398 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 470 treesize of output 448