./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/loop-lit/mcmillan2006.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e19ca921 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/loop-lit/mcmillan2006.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 45cd9f1eda35cecb580d3b7fe5199506be9e5041f2297c1c3e22e0a862fa68be --- Real Ultimate output --- This is Ultimate 0.2.2-dev-e19ca92 [2021-12-22 10:41:18,906 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-22 10:41:18,908 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-22 10:41:18,941 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-22 10:41:18,941 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-22 10:41:18,945 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-22 10:41:18,946 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-22 10:41:18,947 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-22 10:41:18,949 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-22 10:41:18,954 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-22 10:41:18,955 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-22 10:41:18,956 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-22 10:41:18,957 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-22 10:41:18,959 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-22 10:41:18,960 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-22 10:41:18,962 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-22 10:41:18,965 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-22 10:41:18,966 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-22 10:41:18,967 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-22 10:41:18,972 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-22 10:41:18,973 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-22 10:41:18,977 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-22 10:41:18,977 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-22 10:41:18,978 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-22 10:41:18,980 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-22 10:41:18,981 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-22 10:41:18,981 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-22 10:41:18,982 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-22 10:41:18,983 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-22 10:41:18,984 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-22 10:41:18,985 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-22 10:41:18,985 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-22 10:41:18,986 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-22 10:41:18,987 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-22 10:41:18,988 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-22 10:41:18,988 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-22 10:41:18,989 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-22 10:41:18,990 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-22 10:41:18,990 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-22 10:41:18,991 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-22 10:41:18,991 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-22 10:41:18,992 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-22 10:41:19,025 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-22 10:41:19,027 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-22 10:41:19,027 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-22 10:41:19,027 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-22 10:41:19,028 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-22 10:41:19,028 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-22 10:41:19,029 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-22 10:41:19,029 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-22 10:41:19,029 INFO L138 SettingsManager]: * Use SBE=true [2021-12-22 10:41:19,029 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-22 10:41:19,030 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-22 10:41:19,030 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-22 10:41:19,031 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-22 10:41:19,031 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-22 10:41:19,031 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-22 10:41:19,031 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-22 10:41:19,031 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-22 10:41:19,031 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-22 10:41:19,032 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-22 10:41:19,032 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-22 10:41:19,032 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-22 10:41:19,032 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-22 10:41:19,032 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-22 10:41:19,032 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-22 10:41:19,033 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 10:41:19,033 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-22 10:41:19,033 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-22 10:41:19,033 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-22 10:41:19,033 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-22 10:41:19,034 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-22 10:41:19,034 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-22 10:41:19,034 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-22 10:41:19,034 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-22 10:41:19,034 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-22 10:41:19,035 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 45cd9f1eda35cecb580d3b7fe5199506be9e5041f2297c1c3e22e0a862fa68be [2021-12-22 10:41:19,270 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-22 10:41:19,290 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-22 10:41:19,292 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-22 10:41:19,293 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-22 10:41:19,293 INFO L275 PluginConnector]: CDTParser initialized [2021-12-22 10:41:19,294 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-lit/mcmillan2006.i [2021-12-22 10:41:19,340 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e7452f6c8/0925c776e1384bbda0f8c541ae49594c/FLAG12296758e [2021-12-22 10:41:19,730 INFO L306 CDTParser]: Found 1 translation units. [2021-12-22 10:41:19,731 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-lit/mcmillan2006.i [2021-12-22 10:41:19,735 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e7452f6c8/0925c776e1384bbda0f8c541ae49594c/FLAG12296758e [2021-12-22 10:41:19,747 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e7452f6c8/0925c776e1384bbda0f8c541ae49594c [2021-12-22 10:41:19,749 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-22 10:41:19,750 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-22 10:41:19,751 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-22 10:41:19,751 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-22 10:41:19,754 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-22 10:41:19,754 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 10:41:19" (1/1) ... [2021-12-22 10:41:19,755 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2f42da76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 10:41:19, skipping insertion in model container [2021-12-22 10:41:19,755 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 10:41:19" (1/1) ... [2021-12-22 10:41:19,761 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-22 10:41:19,774 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-22 10:41:19,914 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-lit/mcmillan2006.i[1009,1022] [2021-12-22 10:41:19,928 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 10:41:19,935 INFO L203 MainTranslator]: Completed pre-run [2021-12-22 10:41:19,947 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-lit/mcmillan2006.i[1009,1022] [2021-12-22 10:41:19,955 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 10:41:19,968 INFO L208 MainTranslator]: Completed translation [2021-12-22 10:41:19,969 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 10:41:19 WrapperNode [2021-12-22 10:41:19,969 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-22 10:41:19,970 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-22 10:41:19,970 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-22 10:41:19,970 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-22 10:41:19,976 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 10:41:19" (1/1) ... [2021-12-22 10:41:19,983 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 10:41:19" (1/1) ... [2021-12-22 10:41:19,999 INFO L137 Inliner]: procedures = 18, calls = 10, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 46 [2021-12-22 10:41:19,999 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-22 10:41:20,000 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-22 10:41:20,000 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-22 10:41:20,000 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-22 10:41:20,006 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 10:41:19" (1/1) ... [2021-12-22 10:41:20,007 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 10:41:19" (1/1) ... [2021-12-22 10:41:20,015 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 10:41:19" (1/1) ... [2021-12-22 10:41:20,016 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 10:41:19" (1/1) ... [2021-12-22 10:41:20,023 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 10:41:19" (1/1) ... [2021-12-22 10:41:20,031 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 10:41:19" (1/1) ... [2021-12-22 10:41:20,035 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 10:41:19" (1/1) ... [2021-12-22 10:41:20,037 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-22 10:41:20,039 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-22 10:41:20,039 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-22 10:41:20,039 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-22 10:41:20,040 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 10:41:19" (1/1) ... [2021-12-22 10:41:20,045 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 10:41:20,056 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:41:20,066 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-22 10:41:20,067 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-22 10:41:20,095 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-22 10:41:20,095 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-22 10:41:20,095 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-12-22 10:41:20,096 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-22 10:41:20,096 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-22 10:41:20,096 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-22 10:41:20,096 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-12-22 10:41:20,140 INFO L234 CfgBuilder]: Building ICFG [2021-12-22 10:41:20,141 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-22 10:41:20,219 INFO L275 CfgBuilder]: Performing block encoding [2021-12-22 10:41:20,224 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-22 10:41:20,224 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-12-22 10:41:20,225 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 10:41:20 BoogieIcfgContainer [2021-12-22 10:41:20,225 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-22 10:41:20,227 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-22 10:41:20,227 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-22 10:41:20,229 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-22 10:41:20,229 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 10:41:19" (1/3) ... [2021-12-22 10:41:20,230 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2451d377 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 10:41:20, skipping insertion in model container [2021-12-22 10:41:20,230 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 10:41:19" (2/3) ... [2021-12-22 10:41:20,230 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2451d377 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 10:41:20, skipping insertion in model container [2021-12-22 10:41:20,230 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 10:41:20" (3/3) ... [2021-12-22 10:41:20,231 INFO L111 eAbstractionObserver]: Analyzing ICFG mcmillan2006.i [2021-12-22 10:41:20,235 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-22 10:41:20,235 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-22 10:41:20,276 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-22 10:41:20,281 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-22 10:41:20,281 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-22 10:41:20,291 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 14 states have (on average 1.5) internal successors, (21), 15 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:20,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-12-22 10:41:20,295 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:41:20,295 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:41:20,296 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:41:20,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:41:20,300 INFO L85 PathProgramCache]: Analyzing trace with hash 186158361, now seen corresponding path program 1 times [2021-12-22 10:41:20,307 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:41:20,307 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1514203058] [2021-12-22 10:41:20,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:41:20,310 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:41:20,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:20,444 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:20,445 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:41:20,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1514203058] [2021-12-22 10:41:20,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1514203058] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 10:41:20,447 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 10:41:20,447 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 10:41:20,448 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528470799] [2021-12-22 10:41:20,449 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 10:41:20,452 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-22 10:41:20,452 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:41:20,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-22 10:41:20,478 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-22 10:41:20,479 INFO L87 Difference]: Start difference. First operand has 16 states, 14 states have (on average 1.5) internal successors, (21), 15 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:20,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:41:20,491 INFO L93 Difference]: Finished difference Result 27 states and 34 transitions. [2021-12-22 10:41:20,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-22 10:41:20,494 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-12-22 10:41:20,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:41:20,500 INFO L225 Difference]: With dead ends: 27 [2021-12-22 10:41:20,501 INFO L226 Difference]: Without dead ends: 12 [2021-12-22 10:41:20,503 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-22 10:41:20,506 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 10:41:20,508 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 10:41:20,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-12-22 10:41:20,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-12-22 10:41:20,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:20,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2021-12-22 10:41:20,534 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 8 [2021-12-22 10:41:20,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:41:20,534 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2021-12-22 10:41:20,534 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:20,535 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2021-12-22 10:41:20,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-12-22 10:41:20,535 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:41:20,536 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:41:20,536 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-22 10:41:20,537 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:41:20,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:41:20,541 INFO L85 PathProgramCache]: Analyzing trace with hash 180617235, now seen corresponding path program 1 times [2021-12-22 10:41:20,541 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:41:20,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1449930774] [2021-12-22 10:41:20,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:41:20,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:41:20,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:20,659 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:20,660 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:41:20,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1449930774] [2021-12-22 10:41:20,660 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1449930774] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 10:41:20,660 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 10:41:20,660 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-22 10:41:20,661 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911175991] [2021-12-22 10:41:20,661 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 10:41:20,662 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-22 10:41:20,662 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:41:20,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-22 10:41:20,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-12-22 10:41:20,663 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:20,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:41:20,731 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2021-12-22 10:41:20,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-22 10:41:20,732 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-12-22 10:41:20,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:41:20,732 INFO L225 Difference]: With dead ends: 22 [2021-12-22 10:41:20,732 INFO L226 Difference]: Without dead ends: 14 [2021-12-22 10:41:20,733 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-12-22 10:41:20,734 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 4 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 10:41:20,735 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 30 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 10:41:20,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-12-22 10:41:20,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2021-12-22 10:41:20,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:20,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-12-22 10:41:20,739 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 8 [2021-12-22 10:41:20,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:41:20,739 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-12-22 10:41:20,739 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:20,740 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-12-22 10:41:20,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-12-22 10:41:20,740 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:41:20,740 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:41:20,741 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-22 10:41:20,741 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:41:20,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:41:20,741 INFO L85 PathProgramCache]: Analyzing trace with hash -875113359, now seen corresponding path program 1 times [2021-12-22 10:41:20,742 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:41:20,742 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [512271367] [2021-12-22 10:41:20,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:41:20,742 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:41:20,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:20,878 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:20,878 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:41:20,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [512271367] [2021-12-22 10:41:20,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [512271367] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 10:41:20,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1359301888] [2021-12-22 10:41:20,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:41:20,880 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:20,880 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:41:20,883 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:41:20,891 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-22 10:41:20,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:20,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 15 conjunts are in the unsatisfiable core [2021-12-22 10:41:20,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:41:21,048 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-12-22 10:41:21,131 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:21,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:41:21,198 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2021-12-22 10:41:21,201 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 20 [2021-12-22 10:41:21,219 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:21,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1359301888] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:41:21,220 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 10:41:21,220 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 11 [2021-12-22 10:41:21,221 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354611125] [2021-12-22 10:41:21,221 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 10:41:21,222 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-22 10:41:21,223 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:41:21,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-22 10:41:21,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-12-22 10:41:21,225 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:21,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:41:21,316 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2021-12-22 10:41:21,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-22 10:41:21,317 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-12-22 10:41:21,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:41:21,318 INFO L225 Difference]: With dead ends: 21 [2021-12-22 10:41:21,318 INFO L226 Difference]: Without dead ends: 19 [2021-12-22 10:41:21,320 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 12 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2021-12-22 10:41:21,328 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 15 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 10:41:21,328 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 37 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 10:41:21,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-12-22 10:41:21,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 15. [2021-12-22 10:41:21,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:21,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-12-22 10:41:21,335 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2021-12-22 10:41:21,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:41:21,336 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-12-22 10:41:21,336 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:21,336 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-12-22 10:41:21,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-12-22 10:41:21,337 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:41:21,337 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:41:21,363 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-22 10:41:21,560 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:21,561 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:41:21,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:41:21,561 INFO L85 PathProgramCache]: Analyzing trace with hash -1418361721, now seen corresponding path program 1 times [2021-12-22 10:41:21,561 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:41:21,562 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1608621642] [2021-12-22 10:41:21,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:41:21,562 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:41:21,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:21,654 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:21,654 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:41:21,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1608621642] [2021-12-22 10:41:21,656 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1608621642] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 10:41:21,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353496310] [2021-12-22 10:41:21,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:41:21,659 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:21,659 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:41:21,664 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:41:21,665 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-22 10:41:21,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:21,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-22 10:41:21,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:41:21,768 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:21,769 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:41:21,820 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:21,821 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1353496310] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:41:21,821 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 10:41:21,821 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 11 [2021-12-22 10:41:21,821 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1933216171] [2021-12-22 10:41:21,822 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 10:41:21,823 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-22 10:41:21,823 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:41:21,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-22 10:41:21,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2021-12-22 10:41:21,824 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:21,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:41:21,887 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2021-12-22 10:41:21,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-22 10:41:21,888 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-12-22 10:41:21,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:41:21,889 INFO L225 Difference]: With dead ends: 30 [2021-12-22 10:41:21,889 INFO L226 Difference]: Without dead ends: 18 [2021-12-22 10:41:21,890 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2021-12-22 10:41:21,891 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 11 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 10:41:21,891 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 39 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 10:41:21,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-12-22 10:41:21,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2021-12-22 10:41:21,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:21,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-12-22 10:41:21,895 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 14 [2021-12-22 10:41:21,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:41:21,895 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-12-22 10:41:21,896 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:21,896 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-12-22 10:41:21,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-12-22 10:41:21,897 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:41:21,897 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:41:21,926 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-22 10:41:22,123 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2021-12-22 10:41:22,124 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:41:22,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:41:22,125 INFO L85 PathProgramCache]: Analyzing trace with hash -324855195, now seen corresponding path program 2 times [2021-12-22 10:41:22,125 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:41:22,125 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1851467897] [2021-12-22 10:41:22,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:41:22,125 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:41:22,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:22,245 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:22,245 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:41:22,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1851467897] [2021-12-22 10:41:22,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1851467897] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 10:41:22,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [120984391] [2021-12-22 10:41:22,246 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-22 10:41:22,246 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:22,246 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:41:22,247 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:41:22,276 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-22 10:41:22,291 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-22 10:41:22,292 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 10:41:22,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-22 10:41:22,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:41:22,314 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-22 10:41:22,389 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:22,390 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:41:22,440 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-12-22 10:41:22,442 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2021-12-22 10:41:22,458 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:22,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [120984391] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:41:22,458 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 10:41:22,459 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 12 [2021-12-22 10:41:22,459 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16156604] [2021-12-22 10:41:22,459 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 10:41:22,459 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-22 10:41:22,460 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:41:22,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-22 10:41:22,460 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-12-22 10:41:22,460 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:22,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:41:22,567 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2021-12-22 10:41:22,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-22 10:41:22,568 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-12-22 10:41:22,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:41:22,569 INFO L225 Difference]: With dead ends: 27 [2021-12-22 10:41:22,569 INFO L226 Difference]: Without dead ends: 25 [2021-12-22 10:41:22,569 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 24 SyntacticMatches, 5 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2021-12-22 10:41:22,570 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 19 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 10:41:22,570 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 51 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 10:41:22,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-12-22 10:41:22,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 21. [2021-12-22 10:41:22,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.1) internal successors, (22), 20 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:22,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2021-12-22 10:41:22,575 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 16 [2021-12-22 10:41:22,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:41:22,575 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2021-12-22 10:41:22,575 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:22,575 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2021-12-22 10:41:22,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-12-22 10:41:22,576 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:41:22,576 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:41:22,599 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-22 10:41:22,799 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:22,799 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:41:22,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:41:22,800 INFO L85 PathProgramCache]: Analyzing trace with hash 1610985595, now seen corresponding path program 3 times [2021-12-22 10:41:22,800 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:41:22,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [818520078] [2021-12-22 10:41:22,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:41:22,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:41:22,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:22,874 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:22,874 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:41:22,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [818520078] [2021-12-22 10:41:22,874 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [818520078] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 10:41:22,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1122427770] [2021-12-22 10:41:22,875 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-22 10:41:22,875 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:22,875 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:41:22,876 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:41:22,878 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-22 10:41:22,914 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-12-22 10:41:22,915 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 10:41:22,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-22 10:41:22,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:41:23,012 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:23,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:41:23,061 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:23,062 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1122427770] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:41:23,062 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 10:41:23,062 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-12-22 10:41:23,062 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1502119131] [2021-12-22 10:41:23,063 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 10:41:23,063 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-12-22 10:41:23,063 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:41:23,064 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-12-22 10:41:23,064 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2021-12-22 10:41:23,064 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 14 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:23,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:41:23,133 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2021-12-22 10:41:23,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-22 10:41:23,133 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 14 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-12-22 10:41:23,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:41:23,134 INFO L225 Difference]: With dead ends: 40 [2021-12-22 10:41:23,134 INFO L226 Difference]: Without dead ends: 24 [2021-12-22 10:41:23,135 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=82, Invalid=224, Unknown=0, NotChecked=0, Total=306 [2021-12-22 10:41:23,135 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 18 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 10:41:23,136 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 62 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 10:41:23,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-12-22 10:41:23,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2021-12-22 10:41:23,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:23,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2021-12-22 10:41:23,140 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2021-12-22 10:41:23,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:41:23,140 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2021-12-22 10:41:23,140 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 14 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:23,140 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2021-12-22 10:41:23,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-12-22 10:41:23,141 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:41:23,141 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:41:23,166 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-22 10:41:23,355 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:23,355 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:41:23,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:41:23,356 INFO L85 PathProgramCache]: Analyzing trace with hash 731310041, now seen corresponding path program 4 times [2021-12-22 10:41:23,356 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:41:23,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [914827194] [2021-12-22 10:41:23,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:41:23,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:41:23,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:23,514 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:23,515 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:41:23,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [914827194] [2021-12-22 10:41:23,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [914827194] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 10:41:23,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1903336218] [2021-12-22 10:41:23,516 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-22 10:41:23,516 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:23,516 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:41:23,517 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:41:23,518 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-22 10:41:23,565 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-22 10:41:23,565 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 10:41:23,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-22 10:41:23,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:41:23,628 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-22 10:41:23,965 INFO L353 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-12-22 10:41:23,966 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 23 [2021-12-22 10:41:23,982 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:23,982 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:41:24,314 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2021-12-22 10:41:24,324 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 28 [2021-12-22 10:41:24,338 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:24,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1903336218] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:41:24,338 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 10:41:24,338 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 12] total 27 [2021-12-22 10:41:24,338 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777024494] [2021-12-22 10:41:24,338 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 10:41:24,339 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-22 10:41:24,339 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:41:24,339 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-22 10:41:24,343 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=599, Unknown=0, NotChecked=0, Total=702 [2021-12-22 10:41:24,344 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 27 states, 27 states have (on average 2.0) internal successors, (54), 27 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:24,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:41:24,551 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2021-12-22 10:41:24,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-12-22 10:41:24,552 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.0) internal successors, (54), 27 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-12-22 10:41:24,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:41:24,552 INFO L225 Difference]: With dead ends: 41 [2021-12-22 10:41:24,552 INFO L226 Difference]: Without dead ends: 25 [2021-12-22 10:41:24,553 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 277 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=188, Invalid=1144, Unknown=0, NotChecked=0, Total=1332 [2021-12-22 10:41:24,554 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 11 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 51 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 10:41:24,554 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 84 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 41 Invalid, 0 Unknown, 51 Unchecked, 0.0s Time] [2021-12-22 10:41:24,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-12-22 10:41:24,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-12-22 10:41:24,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 24 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:24,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2021-12-22 10:41:24,559 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2021-12-22 10:41:24,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:41:24,559 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2021-12-22 10:41:24,559 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.0) internal successors, (54), 27 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:24,559 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2021-12-22 10:41:24,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-12-22 10:41:24,560 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:41:24,560 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:41:24,585 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-22 10:41:24,775 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:24,776 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:41:24,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:41:24,776 INFO L85 PathProgramCache]: Analyzing trace with hash 1471659959, now seen corresponding path program 5 times [2021-12-22 10:41:24,776 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:41:24,776 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1978877128] [2021-12-22 10:41:24,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:41:24,777 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:41:24,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:24,923 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:24,924 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:41:24,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1978877128] [2021-12-22 10:41:24,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1978877128] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 10:41:24,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1759966241] [2021-12-22 10:41:24,924 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-22 10:41:24,924 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:24,924 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:41:24,926 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:41:24,940 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-22 10:41:24,973 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-12-22 10:41:24,974 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 10:41:24,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-22 10:41:24,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:41:25,002 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-22 10:41:25,055 INFO L353 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-12-22 10:41:25,056 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 26 [2021-12-22 10:41:25,184 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:25,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:41:25,292 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-12-22 10:41:25,295 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2021-12-22 10:41:25,324 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:25,325 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1759966241] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:41:25,325 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 10:41:25,325 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 18 [2021-12-22 10:41:25,325 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1162786740] [2021-12-22 10:41:25,325 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 10:41:25,326 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-22 10:41:25,326 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:41:25,327 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-22 10:41:25,327 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2021-12-22 10:41:25,327 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 18 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:25,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:41:25,503 INFO L93 Difference]: Finished difference Result 49 states and 51 transitions. [2021-12-22 10:41:25,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-22 10:41:25,503 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 18 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-12-22 10:41:25,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:41:25,504 INFO L225 Difference]: With dead ends: 49 [2021-12-22 10:41:25,504 INFO L226 Difference]: Without dead ends: 47 [2021-12-22 10:41:25,504 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 36 SyntacticMatches, 6 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=463, Unknown=0, NotChecked=0, Total=552 [2021-12-22 10:41:25,505 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 21 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 19 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 10:41:25,505 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 143 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 209 Invalid, 0 Unknown, 19 Unchecked, 0.1s Time] [2021-12-22 10:41:25,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-12-22 10:41:25,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 32. [2021-12-22 10:41:25,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.096774193548387) internal successors, (34), 31 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:25,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2021-12-22 10:41:25,510 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 24 [2021-12-22 10:41:25,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:41:25,511 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2021-12-22 10:41:25,511 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 18 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:25,511 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2021-12-22 10:41:25,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-12-22 10:41:25,512 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:41:25,512 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:41:25,536 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-22 10:41:25,715 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:25,716 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:41:25,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:41:25,716 INFO L85 PathProgramCache]: Analyzing trace with hash -16639979, now seen corresponding path program 6 times [2021-12-22 10:41:25,716 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:41:25,716 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [444610801] [2021-12-22 10:41:25,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:41:25,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:41:25,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:25,873 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:25,873 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:41:25,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [444610801] [2021-12-22 10:41:25,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [444610801] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 10:41:25,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1636389136] [2021-12-22 10:41:25,874 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-22 10:41:25,874 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:25,874 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:41:25,875 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:41:25,877 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-22 10:41:25,935 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-12-22 10:41:25,936 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 10:41:25,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 29 conjunts are in the unsatisfiable core [2021-12-22 10:41:25,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:41:25,964 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-22 10:41:26,001 INFO L353 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-12-22 10:41:26,002 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-12-22 10:41:26,039 INFO L353 Elim1Store]: treesize reduction 25, result has 37.5 percent of original size [2021-12-22 10:41:26,040 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 30 [2021-12-22 10:41:26,201 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:26,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:41:28,317 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~i~0#1| Int)) (or (< (+ |ULTIMATE.start_main_~i~0#1| 1) |c_ULTIMATE.start_main_~n~0#1|) (forall ((v_ArrVal_119 Int)) (= (select (store (select |c_#memory_int| |c_ULTIMATE.start_main_~x~0#1.base|) (+ |c_ULTIMATE.start_main_~x~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4)) v_ArrVal_119) (+ |c_ULTIMATE.start_main_~x~0#1.offset| 8)) 0)))) is different from false [2021-12-22 10:41:28,390 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-12-22 10:41:28,392 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2021-12-22 10:41:28,416 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 9 not checked. [2021-12-22 10:41:28,416 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1636389136] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:41:28,416 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 10:41:28,416 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15, 15] total 24 [2021-12-22 10:41:28,417 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156225211] [2021-12-22 10:41:28,417 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 10:41:28,417 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-12-22 10:41:28,417 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:41:28,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-12-22 10:41:28,418 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=423, Unknown=1, NotChecked=42, Total=552 [2021-12-22 10:41:28,418 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 24 states, 24 states have (on average 2.125) internal successors, (51), 24 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:30,492 WARN L838 $PredicateComparison]: unable to prove that (and (<= 3 |c_ULTIMATE.start_main_~i~0#1|) (< 3 |c_ULTIMATE.start_main_~n~0#1|) (forall ((|ULTIMATE.start_main_~i~0#1| Int)) (or (< (+ |ULTIMATE.start_main_~i~0#1| 1) |c_ULTIMATE.start_main_~n~0#1|) (forall ((v_ArrVal_119 Int)) (= (select (store (select |c_#memory_int| |c_ULTIMATE.start_main_~x~0#1.base|) (+ |c_ULTIMATE.start_main_~x~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4)) v_ArrVal_119) (+ |c_ULTIMATE.start_main_~x~0#1.offset| 8)) 0)))) (= (select (select |c_#memory_int| |c_ULTIMATE.start_main_~x~0#1.base|) (+ |c_ULTIMATE.start_main_~x~0#1.offset| 8)) 0)) is different from false [2021-12-22 10:41:30,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:41:30,616 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2021-12-22 10:41:30,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-22 10:41:30,617 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.125) internal successors, (51), 24 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-12-22 10:41:30,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:41:30,617 INFO L225 Difference]: With dead ends: 47 [2021-12-22 10:41:30,617 INFO L226 Difference]: Without dead ends: 45 [2021-12-22 10:41:30,618 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 38 SyntacticMatches, 6 SemanticMatches, 31 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=149, Invalid=787, Unknown=2, NotChecked=118, Total=1056 [2021-12-22 10:41:30,619 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 48 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 29 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 10:41:30,619 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 85 Invalid, 237 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 168 Invalid, 0 Unknown, 29 Unchecked, 0.1s Time] [2021-12-22 10:41:30,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-12-22 10:41:30,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 29. [2021-12-22 10:41:30,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 28 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:30,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2021-12-22 10:41:30,624 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2021-12-22 10:41:30,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:41:30,624 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2021-12-22 10:41:30,624 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.125) internal successors, (51), 24 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:30,624 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2021-12-22 10:41:30,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-12-22 10:41:30,625 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:41:30,625 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:41:30,653 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-12-22 10:41:30,835 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:30,835 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:41:30,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:41:30,836 INFO L85 PathProgramCache]: Analyzing trace with hash 985881805, now seen corresponding path program 7 times [2021-12-22 10:41:30,836 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:41:30,836 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [461544539] [2021-12-22 10:41:30,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:41:30,836 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:41:30,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:30,972 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:30,973 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:41:30,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [461544539] [2021-12-22 10:41:30,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [461544539] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 10:41:30,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [968217676] [2021-12-22 10:41:30,973 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-22 10:41:30,973 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:30,973 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:41:30,974 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:41:30,976 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-22 10:41:31,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:31,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 25 conjunts are in the unsatisfiable core [2021-12-22 10:41:31,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:41:31,074 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-22 10:41:31,238 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:31,239 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:41:31,319 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-12-22 10:41:31,321 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2021-12-22 10:41:31,358 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:31,358 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [968217676] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:41:31,358 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 10:41:31,359 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 18 [2021-12-22 10:41:31,359 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139508935] [2021-12-22 10:41:31,359 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 10:41:31,359 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-22 10:41:31,359 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:41:31,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-22 10:41:31,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=262, Unknown=0, NotChecked=0, Total=306 [2021-12-22 10:41:31,360 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand has 18 states, 18 states have (on average 2.611111111111111) internal successors, (47), 18 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:31,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:41:31,564 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2021-12-22 10:41:31,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-12-22 10:41:31,565 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.611111111111111) internal successors, (47), 18 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-12-22 10:41:31,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:41:31,565 INFO L225 Difference]: With dead ends: 39 [2021-12-22 10:41:31,565 INFO L226 Difference]: Without dead ends: 37 [2021-12-22 10:41:31,566 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 46 SyntacticMatches, 5 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=92, Invalid=508, Unknown=0, NotChecked=0, Total=600 [2021-12-22 10:41:31,566 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 25 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 10:41:31,567 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 124 Invalid, 287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 268 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 10:41:31,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-12-22 10:41:31,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 33. [2021-12-22 10:41:31,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.0625) internal successors, (34), 32 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:31,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2021-12-22 10:41:31,573 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 28 [2021-12-22 10:41:31,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:41:31,573 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2021-12-22 10:41:31,573 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.611111111111111) internal successors, (47), 18 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:31,573 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2021-12-22 10:41:31,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-12-22 10:41:31,574 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:41:31,574 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:41:31,600 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-12-22 10:41:31,775 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-12-22 10:41:31,775 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:41:31,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:41:31,776 INFO L85 PathProgramCache]: Analyzing trace with hash 1173257955, now seen corresponding path program 8 times [2021-12-22 10:41:31,776 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:41:31,776 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1690331226] [2021-12-22 10:41:31,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:41:31,776 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:41:31,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:31,878 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 19 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:31,878 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:41:31,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1690331226] [2021-12-22 10:41:31,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1690331226] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 10:41:31,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1334656661] [2021-12-22 10:41:31,879 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-22 10:41:31,879 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:31,879 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:41:31,881 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:41:31,882 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-22 10:41:31,938 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-22 10:41:31,939 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 10:41:31,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-22 10:41:31,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:41:32,092 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 32 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:32,093 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:41:32,180 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 32 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:32,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1334656661] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:41:32,181 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 10:41:32,181 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-12-22 10:41:32,181 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689540761] [2021-12-22 10:41:32,181 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 10:41:32,182 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-22 10:41:32,182 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:41:32,182 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-22 10:41:32,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=285, Unknown=0, NotChecked=0, Total=380 [2021-12-22 10:41:32,183 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand has 20 states, 20 states have (on average 2.9) internal successors, (58), 20 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:32,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:41:32,301 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2021-12-22 10:41:32,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-22 10:41:32,301 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.9) internal successors, (58), 20 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-12-22 10:41:32,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:41:32,302 INFO L225 Difference]: With dead ends: 60 [2021-12-22 10:41:32,302 INFO L226 Difference]: Without dead ends: 36 [2021-12-22 10:41:32,303 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=161, Invalid=489, Unknown=0, NotChecked=0, Total=650 [2021-12-22 10:41:32,303 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 20 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 10:41:32,304 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 86 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 10:41:32,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-12-22 10:41:32,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2021-12-22 10:41:32,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:32,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2021-12-22 10:41:32,309 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2021-12-22 10:41:32,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:41:32,310 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2021-12-22 10:41:32,310 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.9) internal successors, (58), 20 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:32,310 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2021-12-22 10:41:32,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-12-22 10:41:32,311 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:41:32,311 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:41:32,337 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-12-22 10:41:32,527 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:32,527 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:41:32,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:41:32,528 INFO L85 PathProgramCache]: Analyzing trace with hash -92169919, now seen corresponding path program 9 times [2021-12-22 10:41:32,528 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:41:32,528 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [663466145] [2021-12-22 10:41:32,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:41:32,528 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:41:32,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:32,690 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:32,691 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:41:32,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [663466145] [2021-12-22 10:41:32,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [663466145] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 10:41:32,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2095819036] [2021-12-22 10:41:32,691 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-22 10:41:32,691 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:32,691 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:41:32,692 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:41:32,721 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-22 10:41:32,757 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-12-22 10:41:32,757 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 10:41:32,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-22 10:41:32,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:41:32,834 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-22 10:41:33,270 INFO L353 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-12-22 10:41:33,271 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 23 [2021-12-22 10:41:33,301 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 28 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:33,302 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:41:33,752 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2021-12-22 10:41:33,754 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 28 [2021-12-22 10:41:33,774 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 24 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:33,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2095819036] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:41:33,774 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 10:41:33,775 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 16] total 37 [2021-12-22 10:41:33,775 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2037009648] [2021-12-22 10:41:33,775 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 10:41:33,775 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-12-22 10:41:33,775 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:41:33,776 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-12-22 10:41:33,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=1160, Unknown=0, NotChecked=0, Total=1332 [2021-12-22 10:41:33,776 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand has 37 states, 37 states have (on average 2.324324324324324) internal successors, (86), 37 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:34,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:41:34,259 INFO L93 Difference]: Finished difference Result 61 states and 63 transitions. [2021-12-22 10:41:34,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-12-22 10:41:34,260 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.324324324324324) internal successors, (86), 37 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-12-22 10:41:34,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:41:34,260 INFO L225 Difference]: With dead ends: 61 [2021-12-22 10:41:34,260 INFO L226 Difference]: Without dead ends: 37 [2021-12-22 10:41:34,262 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 621 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=389, Invalid=2803, Unknown=0, NotChecked=0, Total=3192 [2021-12-22 10:41:34,262 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 28 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 237 SdHoareTripleChecker+Invalid, 237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 117 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 10:41:34,262 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 237 Invalid, 237 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 118 Invalid, 0 Unknown, 117 Unchecked, 0.1s Time] [2021-12-22 10:41:34,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-12-22 10:41:34,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-12-22 10:41:34,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.0555555555555556) internal successors, (38), 36 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:34,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2021-12-22 10:41:34,268 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2021-12-22 10:41:34,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:41:34,269 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2021-12-22 10:41:34,269 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.324324324324324) internal successors, (86), 37 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:34,269 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2021-12-22 10:41:34,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-12-22 10:41:34,270 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:41:34,270 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:41:34,293 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-12-22 10:41:34,488 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-12-22 10:41:34,488 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:41:34,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:41:34,489 INFO L85 PathProgramCache]: Analyzing trace with hash -692612065, now seen corresponding path program 10 times [2021-12-22 10:41:34,489 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:41:34,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [332214814] [2021-12-22 10:41:34,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:41:34,489 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:41:34,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:34,687 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:34,687 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:41:34,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [332214814] [2021-12-22 10:41:34,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [332214814] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 10:41:34,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [37560980] [2021-12-22 10:41:34,687 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-22 10:41:34,687 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:34,687 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:41:34,688 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:41:34,690 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-22 10:41:34,759 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-22 10:41:34,759 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 10:41:34,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 36 conjunts are in the unsatisfiable core [2021-12-22 10:41:34,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:41:34,846 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-22 10:41:34,919 INFO L353 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-12-22 10:41:34,919 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 26 [2021-12-22 10:41:35,802 INFO L353 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-12-22 10:41:35,802 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 51 treesize of output 26 [2021-12-22 10:41:35,823 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:35,824 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:41:36,197 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-12-22 10:41:36,199 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2021-12-22 10:41:36,227 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-22 10:41:36,228 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [37560980] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:41:36,228 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 10:41:36,228 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 18, 16] total 40 [2021-12-22 10:41:36,228 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161631524] [2021-12-22 10:41:36,228 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 10:41:36,229 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-12-22 10:41:36,229 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:41:36,229 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-12-22 10:41:36,230 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=1373, Unknown=0, NotChecked=0, Total=1560 [2021-12-22 10:41:36,230 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand has 40 states, 40 states have (on average 2.275) internal successors, (91), 40 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:37,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:41:37,535 INFO L93 Difference]: Finished difference Result 85 states and 92 transitions. [2021-12-22 10:41:37,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-12-22 10:41:37,535 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.275) internal successors, (91), 40 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-12-22 10:41:37,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:41:37,536 INFO L225 Difference]: With dead ends: 85 [2021-12-22 10:41:37,536 INFO L226 Difference]: Without dead ends: 83 [2021-12-22 10:41:37,537 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 48 SyntacticMatches, 5 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1160 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=536, Invalid=4576, Unknown=0, NotChecked=0, Total=5112 [2021-12-22 10:41:37,538 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 45 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 208 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 208 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 75 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 10:41:37,538 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 241 Invalid, 303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 208 Invalid, 0 Unknown, 75 Unchecked, 0.1s Time] [2021-12-22 10:41:37,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-12-22 10:41:37,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 60. [2021-12-22 10:41:37,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.0508474576271187) internal successors, (62), 59 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:37,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2021-12-22 10:41:37,549 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 36 [2021-12-22 10:41:37,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:41:37,550 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2021-12-22 10:41:37,550 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.275) internal successors, (91), 40 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:37,550 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2021-12-22 10:41:37,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-12-22 10:41:37,551 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:41:37,551 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:41:37,569 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-12-22 10:41:37,759 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-12-22 10:41:37,760 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:41:37,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:41:37,760 INFO L85 PathProgramCache]: Analyzing trace with hash -1452500589, now seen corresponding path program 11 times [2021-12-22 10:41:37,760 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:41:37,760 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1189645529] [2021-12-22 10:41:37,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:41:37,760 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:41:37,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:37,947 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:37,947 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:41:37,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1189645529] [2021-12-22 10:41:37,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1189645529] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 10:41:37,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1688275816] [2021-12-22 10:41:37,949 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-22 10:41:37,949 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:37,949 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:41:37,950 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:41:37,952 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-12-22 10:41:38,029 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-12-22 10:41:38,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 10:41:38,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 36 conjunts are in the unsatisfiable core [2021-12-22 10:41:38,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:41:38,082 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-22 10:41:38,138 INFO L353 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-12-22 10:41:38,139 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 26 [2021-12-22 10:41:38,357 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:38,357 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:41:38,483 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-12-22 10:41:38,485 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2021-12-22 10:41:38,531 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:38,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1688275816] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:41:38,531 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 10:41:38,532 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 27 [2021-12-22 10:41:38,532 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442736764] [2021-12-22 10:41:38,532 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 10:41:38,533 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-22 10:41:38,533 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:41:38,534 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-22 10:41:38,534 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=630, Unknown=0, NotChecked=0, Total=702 [2021-12-22 10:41:38,534 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand has 27 states, 27 states have (on average 2.6296296296296298) internal successors, (71), 27 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:38,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:41:38,840 INFO L93 Difference]: Finished difference Result 114 states and 117 transitions. [2021-12-22 10:41:38,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-12-22 10:41:38,841 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.6296296296296298) internal successors, (71), 27 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-12-22 10:41:38,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:41:38,841 INFO L225 Difference]: With dead ends: 114 [2021-12-22 10:41:38,841 INFO L226 Difference]: Without dead ends: 112 [2021-12-22 10:41:38,842 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 69 SyntacticMatches, 6 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=134, Invalid=1126, Unknown=0, NotChecked=0, Total=1260 [2021-12-22 10:41:38,842 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 30 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 474 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 264 SdHoareTripleChecker+Invalid, 499 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 474 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 2 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 10:41:38,843 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 264 Invalid, 499 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 474 Invalid, 0 Unknown, 2 Unchecked, 0.2s Time] [2021-12-22 10:41:38,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-12-22 10:41:38,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 63. [2021-12-22 10:41:38,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.064516129032258) internal successors, (66), 62 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:38,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2021-12-22 10:41:38,856 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 42 [2021-12-22 10:41:38,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:41:38,856 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2021-12-22 10:41:38,856 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.6296296296296298) internal successors, (71), 27 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:38,856 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2021-12-22 10:41:38,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-12-22 10:41:38,857 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:41:38,857 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:41:38,877 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2021-12-22 10:41:39,067 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-12-22 10:41:39,067 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:41:39,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:41:39,068 INFO L85 PathProgramCache]: Analyzing trace with hash -396306831, now seen corresponding path program 12 times [2021-12-22 10:41:39,068 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:41:39,068 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [973142950] [2021-12-22 10:41:39,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:41:39,068 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:41:39,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:39,314 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 114 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:39,315 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:41:39,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [973142950] [2021-12-22 10:41:39,315 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [973142950] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 10:41:39,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1337084045] [2021-12-22 10:41:39,315 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-22 10:41:39,315 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:39,315 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:41:39,316 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:41:39,318 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-12-22 10:41:39,404 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-12-22 10:41:39,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 10:41:39,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 39 conjunts are in the unsatisfiable core [2021-12-22 10:41:39,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:41:39,446 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-22 10:41:39,493 INFO L353 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-12-22 10:41:39,493 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-12-22 10:41:39,531 INFO L353 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-12-22 10:41:39,531 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-12-22 10:41:39,729 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 1 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:39,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:41:39,923 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-12-22 10:41:39,925 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2021-12-22 10:41:39,973 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 10:41:39,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1337084045] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:41:39,973 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 10:41:39,973 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 28 [2021-12-22 10:41:39,974 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270237316] [2021-12-22 10:41:39,974 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 10:41:39,974 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-12-22 10:41:39,974 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:41:39,974 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-12-22 10:41:39,975 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2021-12-22 10:41:39,975 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand has 28 states, 28 states have (on average 2.6785714285714284) internal successors, (75), 28 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:40,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:41:40,715 INFO L93 Difference]: Finished difference Result 118 states and 121 transitions. [2021-12-22 10:41:40,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-12-22 10:41:40,715 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.6785714285714284) internal successors, (75), 28 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-12-22 10:41:40,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:41:40,716 INFO L225 Difference]: With dead ends: 118 [2021-12-22 10:41:40,716 INFO L226 Difference]: Without dead ends: 116 [2021-12-22 10:41:40,717 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 72 SyntacticMatches, 8 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 661 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=389, Invalid=2691, Unknown=0, NotChecked=0, Total=3080 [2021-12-22 10:41:40,717 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 75 mSDsluCounter, 422 mSDsCounter, 0 mSdLazyCounter, 884 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 451 SdHoareTripleChecker+Invalid, 941 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 884 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-22 10:41:40,718 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 451 Invalid, 941 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 884 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-22 10:41:40,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-12-22 10:41:40,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 60. [2021-12-22 10:41:40,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.0508474576271187) internal successors, (62), 59 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:40,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2021-12-22 10:41:40,732 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 44 [2021-12-22 10:41:40,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:41:40,732 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2021-12-22 10:41:40,732 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.6785714285714284) internal successors, (75), 28 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:40,733 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2021-12-22 10:41:40,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-12-22 10:41:40,733 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:41:40,733 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:41:40,753 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2021-12-22 10:41:40,943 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-12-22 10:41:40,943 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:41:40,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:41:40,944 INFO L85 PathProgramCache]: Analyzing trace with hash -1870665559, now seen corresponding path program 13 times [2021-12-22 10:41:40,944 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:41:40,944 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [421839354] [2021-12-22 10:41:40,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:41:40,944 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:41:40,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:41,179 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:41,179 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:41:41,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [421839354] [2021-12-22 10:41:41,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [421839354] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 10:41:41,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1087507579] [2021-12-22 10:41:41,180 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-22 10:41:41,180 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:41,180 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:41:41,181 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:41:41,181 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-12-22 10:41:41,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:41,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 37 conjunts are in the unsatisfiable core [2021-12-22 10:41:41,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:41:41,300 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-22 10:41:41,540 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:41,540 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:41:41,628 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-12-22 10:41:41,630 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2021-12-22 10:41:41,684 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:41,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1087507579] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:41:41,684 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 10:41:41,684 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 27 [2021-12-22 10:41:41,684 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543934631] [2021-12-22 10:41:41,684 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 10:41:41,684 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-22 10:41:41,684 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:41:41,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-22 10:41:41,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=634, Unknown=0, NotChecked=0, Total=702 [2021-12-22 10:41:41,685 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand has 27 states, 27 states have (on average 2.8518518518518516) internal successors, (77), 27 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:42,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:41:42,108 INFO L93 Difference]: Finished difference Result 98 states and 100 transitions. [2021-12-22 10:41:42,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-12-22 10:41:42,108 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.8518518518518516) internal successors, (77), 27 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-12-22 10:41:42,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:41:42,109 INFO L225 Difference]: With dead ends: 98 [2021-12-22 10:41:42,109 INFO L226 Difference]: Without dead ends: 96 [2021-12-22 10:41:42,110 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 79 SyntacticMatches, 5 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 207 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=141, Invalid=1265, Unknown=0, NotChecked=0, Total=1406 [2021-12-22 10:41:42,110 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 42 mSDsluCounter, 419 mSDsCounter, 0 mSdLazyCounter, 800 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 447 SdHoareTripleChecker+Invalid, 831 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 800 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 10:41:42,110 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 447 Invalid, 831 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 800 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-22 10:41:42,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-12-22 10:41:42,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 60. [2021-12-22 10:41:42,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.0508474576271187) internal successors, (62), 59 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:42,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2021-12-22 10:41:42,126 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 46 [2021-12-22 10:41:42,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:41:42,126 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2021-12-22 10:41:42,126 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.8518518518518516) internal successors, (77), 27 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:42,126 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2021-12-22 10:41:42,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-12-22 10:41:42,127 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:41:42,127 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:41:42,144 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-12-22 10:41:42,331 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:42,331 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:41:42,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:41:42,332 INFO L85 PathProgramCache]: Analyzing trace with hash 277462207, now seen corresponding path program 14 times [2021-12-22 10:41:42,332 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:41:42,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [251875232] [2021-12-22 10:41:42,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:41:42,332 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:41:42,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:42,468 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 73 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:42,469 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:41:42,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [251875232] [2021-12-22 10:41:42,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [251875232] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 10:41:42,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1087660946] [2021-12-22 10:41:42,469 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-22 10:41:42,469 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:42,469 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:41:42,471 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:41:42,472 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-12-22 10:41:42,530 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-22 10:41:42,530 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 10:41:42,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-22 10:41:42,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:41:42,769 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 98 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:42,769 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:41:42,872 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 98 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:42,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1087660946] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:41:42,872 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 10:41:42,872 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2021-12-22 10:41:42,872 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145525941] [2021-12-22 10:41:42,872 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 10:41:42,873 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-12-22 10:41:42,873 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:41:42,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-12-22 10:41:42,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=618, Unknown=0, NotChecked=0, Total=812 [2021-12-22 10:41:42,873 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand has 29 states, 29 states have (on average 3.0344827586206895) internal successors, (88), 29 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:43,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:41:43,142 INFO L93 Difference]: Finished difference Result 125 states and 128 transitions. [2021-12-22 10:41:43,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-12-22 10:41:43,142 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 3.0344827586206895) internal successors, (88), 29 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-12-22 10:41:43,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:41:43,143 INFO L225 Difference]: With dead ends: 125 [2021-12-22 10:41:43,143 INFO L226 Difference]: Without dead ends: 54 [2021-12-22 10:41:43,144 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 89 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 484 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=517, Invalid=1645, Unknown=0, NotChecked=0, Total=2162 [2021-12-22 10:41:43,144 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 38 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 10:41:43,145 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 141 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 155 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 10:41:43,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-12-22 10:41:43,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2021-12-22 10:41:43,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.0384615384615385) internal successors, (54), 52 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:43,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2021-12-22 10:41:43,156 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 50 [2021-12-22 10:41:43,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:41:43,157 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2021-12-22 10:41:43,157 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 3.0344827586206895) internal successors, (88), 29 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:43,157 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2021-12-22 10:41:43,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-12-22 10:41:43,158 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:41:43,158 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:41:43,174 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2021-12-22 10:41:43,358 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-12-22 10:41:43,358 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:41:43,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:41:43,359 INFO L85 PathProgramCache]: Analyzing trace with hash -1193657443, now seen corresponding path program 15 times [2021-12-22 10:41:43,359 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:41:43,359 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [966512231] [2021-12-22 10:41:43,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:41:43,359 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:41:43,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:43,628 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:43,628 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:41:43,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [966512231] [2021-12-22 10:41:43,628 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [966512231] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 10:41:43,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1511530306] [2021-12-22 10:41:43,628 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-22 10:41:43,629 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:43,629 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:41:43,630 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:41:43,631 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-12-22 10:41:43,751 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-12-22 10:41:43,751 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 10:41:43,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 28 conjunts are in the unsatisfiable core [2021-12-22 10:41:43,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:41:43,915 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-22 10:41:44,518 INFO L353 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-12-22 10:41:44,518 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 23 [2021-12-22 10:41:44,541 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 91 proven. 71 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:44,542 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:41:45,536 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2021-12-22 10:41:45,539 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 28 [2021-12-22 10:41:45,571 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 84 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:45,571 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1511530306] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:41:45,571 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 10:41:45,572 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 22, 22] total 52 [2021-12-22 10:41:45,572 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2046461792] [2021-12-22 10:41:45,572 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 10:41:45,572 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-12-22 10:41:45,572 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:41:45,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-12-22 10:41:45,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=313, Invalid=2338, Unknown=1, NotChecked=0, Total=2652 [2021-12-22 10:41:45,574 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand has 52 states, 52 states have (on average 2.576923076923077) internal successors, (134), 52 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:46,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:41:46,256 INFO L93 Difference]: Finished difference Result 91 states and 93 transitions. [2021-12-22 10:41:46,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-12-22 10:41:46,256 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.576923076923077) internal successors, (134), 52 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-12-22 10:41:46,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:41:46,256 INFO L225 Difference]: With dead ends: 91 [2021-12-22 10:41:46,256 INFO L226 Difference]: Without dead ends: 55 [2021-12-22 10:41:46,258 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 88 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1077 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=618, Invalid=5233, Unknown=1, NotChecked=0, Total=5852 [2021-12-22 10:41:46,258 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 42 mSDsluCounter, 254 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 275 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 109 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 10:41:46,259 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 275 Invalid, 258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 149 Invalid, 0 Unknown, 109 Unchecked, 0.1s Time] [2021-12-22 10:41:46,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-12-22 10:41:46,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-12-22 10:41:46,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.037037037037037) internal successors, (56), 54 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:46,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2021-12-22 10:41:46,272 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 52 [2021-12-22 10:41:46,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:41:46,272 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2021-12-22 10:41:46,273 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.576923076923077) internal successors, (134), 52 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:46,273 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2021-12-22 10:41:46,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-12-22 10:41:46,273 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:41:46,273 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:41:46,290 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-12-22 10:41:46,475 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-12-22 10:41:46,475 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:41:46,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:41:46,476 INFO L85 PathProgramCache]: Analyzing trace with hash -1895400709, now seen corresponding path program 16 times [2021-12-22 10:41:46,476 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:41:46,476 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [278599466] [2021-12-22 10:41:46,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:41:46,476 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:41:46,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:46,757 INFO L134 CoverageAnalysis]: Checked inductivity of 179 backedges. 0 proven. 179 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:46,757 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:41:46,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [278599466] [2021-12-22 10:41:46,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [278599466] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 10:41:46,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [794708761] [2021-12-22 10:41:46,757 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-22 10:41:46,758 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:46,758 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:41:46,758 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:41:46,760 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-12-22 10:41:46,934 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-22 10:41:46,934 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 10:41:46,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 44 conjunts are in the unsatisfiable core [2021-12-22 10:41:46,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:41:46,987 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-22 10:41:47,040 INFO L353 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-12-22 10:41:47,041 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 26 [2021-12-22 10:41:47,363 INFO L134 CoverageAnalysis]: Checked inductivity of 179 backedges. 0 proven. 179 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:47,363 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:41:47,519 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-12-22 10:41:47,521 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2021-12-22 10:41:47,581 INFO L134 CoverageAnalysis]: Checked inductivity of 179 backedges. 0 proven. 179 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:47,581 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [794708761] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:41:47,581 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 10:41:47,581 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 33 [2021-12-22 10:41:47,582 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098298445] [2021-12-22 10:41:47,582 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 10:41:47,582 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-12-22 10:41:47,582 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:41:47,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-12-22 10:41:47,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=968, Unknown=0, NotChecked=0, Total=1056 [2021-12-22 10:41:47,583 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand has 33 states, 33 states have (on average 2.757575757575758) internal successors, (91), 33 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:48,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:41:48,044 INFO L93 Difference]: Finished difference Result 99 states and 101 transitions. [2021-12-22 10:41:48,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-12-22 10:41:48,044 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.757575757575758) internal successors, (91), 33 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-12-22 10:41:48,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:41:48,045 INFO L225 Difference]: With dead ends: 99 [2021-12-22 10:41:48,045 INFO L226 Difference]: Without dead ends: 97 [2021-12-22 10:41:48,045 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 91 SyntacticMatches, 6 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 274 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=164, Invalid=1728, Unknown=0, NotChecked=0, Total=1892 [2021-12-22 10:41:48,046 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 31 mSDsluCounter, 464 mSDsCounter, 0 mSdLazyCounter, 860 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 488 SdHoareTripleChecker+Invalid, 885 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 860 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 10:41:48,046 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 488 Invalid, 885 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 860 Invalid, 0 Unknown, 1 Unchecked, 0.3s Time] [2021-12-22 10:41:48,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-12-22 10:41:48,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 62. [2021-12-22 10:41:48,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 61 states have (on average 1.0491803278688525) internal successors, (64), 61 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:48,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2021-12-22 10:41:48,057 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 54 [2021-12-22 10:41:48,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:41:48,057 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2021-12-22 10:41:48,057 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.757575757575758) internal successors, (91), 33 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:48,057 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2021-12-22 10:41:48,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-12-22 10:41:48,058 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:41:48,058 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:41:48,075 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-12-22 10:41:48,258 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:48,259 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:41:48,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:41:48,259 INFO L85 PathProgramCache]: Analyzing trace with hash -1960813863, now seen corresponding path program 17 times [2021-12-22 10:41:48,259 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:41:48,259 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1329923111] [2021-12-22 10:41:48,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:41:48,260 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:41:48,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:48,576 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:48,576 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:41:48,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1329923111] [2021-12-22 10:41:48,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1329923111] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 10:41:48,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [188500634] [2021-12-22 10:41:48,576 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-22 10:41:48,576 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:48,576 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:41:48,578 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:41:48,578 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-12-22 10:41:48,691 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 11 check-sat command(s) [2021-12-22 10:41:48,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 10:41:48,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 47 conjunts are in the unsatisfiable core [2021-12-22 10:41:48,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:41:48,761 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-22 10:41:48,801 INFO L353 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-12-22 10:41:48,802 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-12-22 10:41:48,841 INFO L353 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-12-22 10:41:48,841 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-12-22 10:41:49,155 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 1 proven. 197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:49,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:41:49,358 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-12-22 10:41:49,360 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2021-12-22 10:41:49,416 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 197 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 10:41:49,416 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [188500634] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:41:49,416 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 10:41:49,416 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 34 [2021-12-22 10:41:49,416 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2093065518] [2021-12-22 10:41:49,417 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 10:41:49,417 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-12-22 10:41:49,417 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:41:49,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-12-22 10:41:49,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=1028, Unknown=0, NotChecked=0, Total=1122 [2021-12-22 10:41:49,418 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand has 34 states, 34 states have (on average 2.7941176470588234) internal successors, (95), 34 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:50,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:41:50,091 INFO L93 Difference]: Finished difference Result 97 states and 99 transitions. [2021-12-22 10:41:50,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-12-22 10:41:50,092 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.7941176470588234) internal successors, (95), 34 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-12-22 10:41:50,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:41:50,092 INFO L225 Difference]: With dead ends: 97 [2021-12-22 10:41:50,092 INFO L226 Difference]: Without dead ends: 95 [2021-12-22 10:41:50,093 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 94 SyntacticMatches, 8 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 461 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=284, Invalid=2368, Unknown=0, NotChecked=0, Total=2652 [2021-12-22 10:41:50,093 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 64 mSDsluCounter, 349 mSDsCounter, 0 mSdLazyCounter, 922 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 370 SdHoareTripleChecker+Invalid, 979 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 922 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-22 10:41:50,094 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 370 Invalid, 979 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 922 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-22 10:41:50,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-12-22 10:41:50,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 59. [2021-12-22 10:41:50,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 58 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:50,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2021-12-22 10:41:50,110 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 56 [2021-12-22 10:41:50,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:41:50,110 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2021-12-22 10:41:50,110 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.7941176470588234) internal successors, (95), 34 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:50,110 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2021-12-22 10:41:50,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-12-22 10:41:50,111 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:41:50,111 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:41:50,127 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-12-22 10:41:50,311 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:50,311 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:41:50,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:41:50,312 INFO L85 PathProgramCache]: Analyzing trace with hash 1778046481, now seen corresponding path program 18 times [2021-12-22 10:41:50,312 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:41:50,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [556193344] [2021-12-22 10:41:50,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:41:50,312 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:41:50,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:50,567 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 0 proven. 209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:50,568 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:41:50,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [556193344] [2021-12-22 10:41:50,568 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [556193344] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 10:41:50,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [109886839] [2021-12-22 10:41:50,568 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-22 10:41:50,568 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:50,568 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:41:50,569 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:41:50,571 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-12-22 10:41:50,657 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2021-12-22 10:41:50,657 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 10:41:50,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 30 conjunts are in the unsatisfiable core [2021-12-22 10:41:50,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:41:50,844 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-22 10:41:51,549 INFO L353 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-12-22 10:41:51,550 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 23 [2021-12-22 10:41:51,575 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 120 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:51,575 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:41:52,405 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2021-12-22 10:41:52,408 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 28 [2021-12-22 10:41:52,441 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 112 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:52,442 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [109886839] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:41:52,442 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 10:41:52,442 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 24, 24] total 57 [2021-12-22 10:41:52,442 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578098851] [2021-12-22 10:41:52,442 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 10:41:52,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-12-22 10:41:52,442 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:41:52,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-12-22 10:41:52,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=2822, Unknown=0, NotChecked=0, Total=3192 [2021-12-22 10:41:52,443 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand has 57 states, 57 states have (on average 2.6315789473684212) internal successors, (150), 57 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:53,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:41:53,171 INFO L93 Difference]: Finished difference Result 101 states and 103 transitions. [2021-12-22 10:41:53,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-12-22 10:41:53,171 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.6315789473684212) internal successors, (150), 57 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-12-22 10:41:53,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:41:53,171 INFO L225 Difference]: With dead ends: 101 [2021-12-22 10:41:53,171 INFO L226 Difference]: Without dead ends: 61 [2021-12-22 10:41:53,173 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 98 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1300 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=731, Invalid=6409, Unknown=0, NotChecked=0, Total=7140 [2021-12-22 10:41:53,173 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 38 mSDsluCounter, 336 mSDsCounter, 0 mSdLazyCounter, 227 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 358 SdHoareTripleChecker+Invalid, 308 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 79 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 10:41:53,174 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 358 Invalid, 308 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 227 Invalid, 0 Unknown, 79 Unchecked, 0.1s Time] [2021-12-22 10:41:53,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-12-22 10:41:53,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-12-22 10:41:53,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.0333333333333334) internal successors, (62), 60 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:53,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2021-12-22 10:41:53,185 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 58 [2021-12-22 10:41:53,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:41:53,185 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2021-12-22 10:41:53,185 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 2.6315789473684212) internal successors, (150), 57 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:53,185 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2021-12-22 10:41:53,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-12-22 10:41:53,186 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:41:53,186 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:41:53,202 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2021-12-22 10:41:53,386 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:53,386 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:41:53,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:41:53,387 INFO L85 PathProgramCache]: Analyzing trace with hash 71669487, now seen corresponding path program 19 times [2021-12-22 10:41:53,387 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:41:53,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [389248209] [2021-12-22 10:41:53,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:41:53,387 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:41:53,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:53,733 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 0 proven. 228 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:53,734 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:41:53,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [389248209] [2021-12-22 10:41:53,734 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [389248209] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 10:41:53,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1148989375] [2021-12-22 10:41:53,734 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-22 10:41:53,735 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:53,735 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:41:53,736 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:41:53,747 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-12-22 10:41:53,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:53,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 48 conjunts are in the unsatisfiable core [2021-12-22 10:41:53,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:41:53,890 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-22 10:41:53,942 INFO L353 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-12-22 10:41:53,942 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 26 [2021-12-22 10:41:54,272 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 0 proven. 228 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:54,272 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:41:54,432 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-12-22 10:41:54,434 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2021-12-22 10:41:54,505 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 0 proven. 228 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:54,505 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1148989375] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:41:54,505 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 10:41:54,505 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 36 [2021-12-22 10:41:54,505 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103091332] [2021-12-22 10:41:54,505 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 10:41:54,505 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-12-22 10:41:54,506 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:41:54,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-12-22 10:41:54,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1164, Unknown=0, NotChecked=0, Total=1260 [2021-12-22 10:41:54,506 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand has 36 states, 36 states have (on average 2.8055555555555554) internal successors, (101), 36 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:55,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:41:55,075 INFO L93 Difference]: Finished difference Result 109 states and 111 transitions. [2021-12-22 10:41:55,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-12-22 10:41:55,077 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.8055555555555554) internal successors, (101), 36 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-12-22 10:41:55,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:41:55,078 INFO L225 Difference]: With dead ends: 109 [2021-12-22 10:41:55,078 INFO L226 Difference]: Without dead ends: 107 [2021-12-22 10:41:55,078 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 102 SyntacticMatches, 6 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 322 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=179, Invalid=2077, Unknown=0, NotChecked=0, Total=2256 [2021-12-22 10:41:55,079 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 35 mSDsluCounter, 558 mSDsCounter, 0 mSdLazyCounter, 1104 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 584 SdHoareTripleChecker+Invalid, 1132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 1104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-22 10:41:55,079 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 584 Invalid, 1132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 1104 Invalid, 0 Unknown, 1 Unchecked, 0.4s Time] [2021-12-22 10:41:55,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-12-22 10:41:55,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 68. [2021-12-22 10:41:55,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.044776119402985) internal successors, (70), 67 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:55,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2021-12-22 10:41:55,094 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 60 [2021-12-22 10:41:55,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:41:55,094 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2021-12-22 10:41:55,094 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.8055555555555554) internal successors, (101), 36 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:55,094 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2021-12-22 10:41:55,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-12-22 10:41:55,095 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:41:55,095 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:41:55,113 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2021-12-22 10:41:55,299 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-12-22 10:41:55,299 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:41:55,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:41:55,300 INFO L85 PathProgramCache]: Analyzing trace with hash 920885325, now seen corresponding path program 20 times [2021-12-22 10:41:55,300 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:41:55,300 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [777829550] [2021-12-22 10:41:55,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:41:55,300 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:41:55,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:55,624 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 0 proven. 249 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:55,624 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:41:55,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [777829550] [2021-12-22 10:41:55,624 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [777829550] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 10:41:55,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1832355859] [2021-12-22 10:41:55,624 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-22 10:41:55,624 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:55,624 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:41:55,625 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:41:55,626 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-12-22 10:41:55,696 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-22 10:41:55,696 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 10:41:55,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 53 conjunts are in the unsatisfiable core [2021-12-22 10:41:55,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:41:55,757 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-22 10:41:55,786 INFO L353 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-12-22 10:41:55,787 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-12-22 10:41:55,865 INFO L353 Elim1Store]: treesize reduction 80, result has 20.8 percent of original size [2021-12-22 10:41:55,865 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 36 treesize of output 38 [2021-12-22 10:41:56,561 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 1 proven. 248 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:56,561 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:41:57,153 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_main_~i~0#1_253| Int)) (or (not (<= (+ |c_ULTIMATE.start_main_~i~0#1| 1) |v_ULTIMATE.start_main_~i~0#1_253|)) (and (= (select (store (select |c_#memory_int| |c_ULTIMATE.start_main_~x~0#1.base|) (+ |c_ULTIMATE.start_main_~x~0#1.offset| (* |v_ULTIMATE.start_main_~i~0#1_253| 4)) 0) (+ |c_ULTIMATE.start_main_~x~0#1.offset| 32)) 0) (not (<= |v_ULTIMATE.start_main_~i~0#1_253| 7))))) is different from false [2021-12-22 10:41:57,160 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 26 [2021-12-22 10:41:57,161 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 50 [2021-12-22 10:41:57,232 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 0 proven. 239 refuted. 0 times theorem prover too weak. 0 trivial. 10 not checked. [2021-12-22 10:41:57,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1832355859] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:41:57,232 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 10:41:57,232 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 26, 26] total 42 [2021-12-22 10:41:57,233 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1160136727] [2021-12-22 10:41:57,233 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 10:41:57,233 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-12-22 10:41:57,233 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:41:57,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-12-22 10:41:57,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=1506, Unknown=1, NotChecked=78, Total=1722 [2021-12-22 10:41:57,234 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand has 42 states, 42 states have (on average 2.6666666666666665) internal successors, (112), 42 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:57,711 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((|v_ULTIMATE.start_main_~i~0#1_253| Int)) (or (not (<= (+ |c_ULTIMATE.start_main_~i~0#1| 1) |v_ULTIMATE.start_main_~i~0#1_253|)) (and (= (select (store (select |c_#memory_int| |c_ULTIMATE.start_main_~x~0#1.base|) (+ |c_ULTIMATE.start_main_~x~0#1.offset| (* |v_ULTIMATE.start_main_~i~0#1_253| 4)) 0) (+ |c_ULTIMATE.start_main_~x~0#1.offset| 32)) 0) (not (<= |v_ULTIMATE.start_main_~i~0#1_253| 7))))) (<= |c_ULTIMATE.start_main_~i~0#1| 8) (= (select (select |c_#memory_int| |c_ULTIMATE.start_main_~x~0#1.base|) (+ |c_ULTIMATE.start_main_~x~0#1.offset| (* |c_ULTIMATE.start_main_~i~0#1| 4))) 0) (<= 8 |c_ULTIMATE.start_main_~i~0#1|)) is different from false [2021-12-22 10:41:57,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:41:57,761 INFO L93 Difference]: Finished difference Result 107 states and 109 transitions. [2021-12-22 10:41:57,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-12-22 10:41:57,762 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.6666666666666665) internal successors, (112), 42 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 62 [2021-12-22 10:41:57,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:41:57,762 INFO L225 Difference]: With dead ends: 107 [2021-12-22 10:41:57,762 INFO L226 Difference]: Without dead ends: 105 [2021-12-22 10:41:57,763 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 102 SyntacticMatches, 6 SemanticMatches, 41 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=139, Invalid=1507, Unknown=2, NotChecked=158, Total=1806 [2021-12-22 10:41:57,763 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 21 mSDsluCounter, 591 mSDsCounter, 0 mSdLazyCounter, 408 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 616 SdHoareTripleChecker+Invalid, 524 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 408 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 111 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 10:41:57,764 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 616 Invalid, 524 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 408 Invalid, 0 Unknown, 111 Unchecked, 0.1s Time] [2021-12-22 10:41:57,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-12-22 10:41:57,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 65. [2021-12-22 10:41:57,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.03125) internal successors, (66), 64 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:57,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 66 transitions. [2021-12-22 10:41:57,780 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 66 transitions. Word has length 62 [2021-12-22 10:41:57,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:41:57,780 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 66 transitions. [2021-12-22 10:41:57,780 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 2.6666666666666665) internal successors, (112), 42 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:41:57,780 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 66 transitions. [2021-12-22 10:41:57,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-12-22 10:41:57,781 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:41:57,781 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:41:57,803 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-12-22 10:41:57,999 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-12-22 10:41:57,999 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:41:58,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:41:58,000 INFO L85 PathProgramCache]: Analyzing trace with hash -1314727931, now seen corresponding path program 21 times [2021-12-22 10:41:58,000 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:41:58,000 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711635979] [2021-12-22 10:41:58,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:41:58,000 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:41:58,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:41:58,331 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 0 proven. 262 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:58,331 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:41:58,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711635979] [2021-12-22 10:41:58,331 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [711635979] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 10:41:58,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1360235552] [2021-12-22 10:41:58,331 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-22 10:41:58,332 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:41:58,332 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:41:58,332 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:41:58,333 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-12-22 10:41:58,450 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-12-22 10:41:58,450 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 10:41:58,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 32 conjunts are in the unsatisfiable core [2021-12-22 10:41:58,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:41:58,661 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-22 10:41:59,417 INFO L353 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-12-22 10:41:59,418 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 23 [2021-12-22 10:41:59,447 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 153 proven. 109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:41:59,447 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:42:00,310 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2021-12-22 10:42:00,312 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 28 [2021-12-22 10:42:00,345 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 144 proven. 118 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:42:00,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1360235552] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:42:00,346 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 10:42:00,346 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 26, 26] total 62 [2021-12-22 10:42:00,346 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [144373100] [2021-12-22 10:42:00,346 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 10:42:00,347 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-12-22 10:42:00,347 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:42:00,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-12-22 10:42:00,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=432, Invalid=3350, Unknown=0, NotChecked=0, Total=3782 [2021-12-22 10:42:00,348 INFO L87 Difference]: Start difference. First operand 65 states and 66 transitions. Second operand has 62 states, 62 states have (on average 2.6774193548387095) internal successors, (166), 62 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:42:01,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:42:01,473 INFO L93 Difference]: Finished difference Result 111 states and 113 transitions. [2021-12-22 10:42:01,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-12-22 10:42:01,473 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.6774193548387095) internal successors, (166), 62 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-12-22 10:42:01,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:42:01,474 INFO L225 Difference]: With dead ends: 111 [2021-12-22 10:42:01,474 INFO L226 Difference]: Without dead ends: 67 [2021-12-22 10:42:01,475 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 102 SyntacticMatches, 1 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1921 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1024, Invalid=9278, Unknown=0, NotChecked=0, Total=10302 [2021-12-22 10:42:01,475 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 29 mSDsluCounter, 409 mSDsCounter, 0 mSdLazyCounter, 294 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 436 SdHoareTripleChecker+Invalid, 470 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 294 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 172 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 10:42:01,476 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 436 Invalid, 470 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 294 Invalid, 0 Unknown, 172 Unchecked, 0.1s Time] [2021-12-22 10:42:01,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-12-22 10:42:01,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2021-12-22 10:42:01,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:42:01,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2021-12-22 10:42:01,500 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 64 [2021-12-22 10:42:01,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:42:01,500 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2021-12-22 10:42:01,500 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 2.6774193548387095) internal successors, (166), 62 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:42:01,501 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2021-12-22 10:42:01,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-12-22 10:42:01,501 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:42:01,501 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:42:01,535 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-12-22 10:42:01,723 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:42:01,723 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:42:01,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:42:01,724 INFO L85 PathProgramCache]: Analyzing trace with hash 2021980771, now seen corresponding path program 22 times [2021-12-22 10:42:01,724 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:42:01,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1042706175] [2021-12-22 10:42:01,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:42:01,724 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:42:01,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:42:02,078 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 0 proven. 283 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:42:02,078 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:42:02,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1042706175] [2021-12-22 10:42:02,078 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1042706175] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 10:42:02,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1471377291] [2021-12-22 10:42:02,078 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-22 10:42:02,078 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:42:02,079 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:42:02,079 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:42:02,080 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-12-22 10:42:02,306 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-22 10:42:02,306 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 10:42:02,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 56 conjunts are in the unsatisfiable core [2021-12-22 10:42:02,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:42:02,550 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-22 10:42:02,627 INFO L353 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-12-22 10:42:02,627 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 26 [2021-12-22 10:42:06,126 INFO L353 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-12-22 10:42:06,126 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 51 treesize of output 26 [2021-12-22 10:42:06,156 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 0 proven. 283 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:42:06,156 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:42:06,857 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-12-22 10:42:06,860 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2021-12-22 10:42:06,913 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 0 proven. 281 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-22 10:42:06,914 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1471377291] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:42:06,914 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 10:42:06,914 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 28, 26] total 65 [2021-12-22 10:42:06,914 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276641060] [2021-12-22 10:42:06,914 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 10:42:06,914 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-12-22 10:42:06,914 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:42:06,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-12-22 10:42:06,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=387, Invalid=3769, Unknown=4, NotChecked=0, Total=4160 [2021-12-22 10:42:06,915 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand has 65 states, 65 states have (on average 2.6307692307692307) internal successors, (171), 65 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:42:16,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:42:16,354 INFO L93 Difference]: Finished difference Result 150 states and 161 transitions. [2021-12-22 10:42:16,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-12-22 10:42:16,355 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 2.6307692307692307) internal successors, (171), 65 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-12-22 10:42:16,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:42:16,356 INFO L225 Difference]: With dead ends: 150 [2021-12-22 10:42:16,356 INFO L226 Difference]: Without dead ends: 148 [2021-12-22 10:42:16,357 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 100 SyntacticMatches, 10 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3999 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=1366, Invalid=15918, Unknown=8, NotChecked=0, Total=17292 [2021-12-22 10:42:16,358 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 95 mSDsluCounter, 687 mSDsCounter, 0 mSdLazyCounter, 398 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 713 SdHoareTripleChecker+Invalid, 536 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 398 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 116 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 10:42:16,358 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 713 Invalid, 536 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 398 Invalid, 0 Unknown, 116 Unchecked, 0.1s Time] [2021-12-22 10:42:16,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-12-22 10:42:16,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 110. [2021-12-22 10:42:16,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 109 states have (on average 1.0275229357798166) internal successors, (112), 109 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:42:16,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 112 transitions. [2021-12-22 10:42:16,401 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 112 transitions. Word has length 66 [2021-12-22 10:42:16,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:42:16,401 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 112 transitions. [2021-12-22 10:42:16,402 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 2.6307692307692307) internal successors, (171), 65 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:42:16,402 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 112 transitions. [2021-12-22 10:42:16,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-12-22 10:42:16,402 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:42:16,402 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:42:16,419 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-12-22 10:42:16,602 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:42:16,603 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:42:16,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:42:16,603 INFO L85 PathProgramCache]: Analyzing trace with hash -39467689, now seen corresponding path program 23 times [2021-12-22 10:42:16,603 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:42:16,603 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1375105382] [2021-12-22 10:42:16,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:42:16,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:42:16,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:42:17,047 INFO L134 CoverageAnalysis]: Checked inductivity of 344 backedges. 0 proven. 344 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:42:17,048 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:42:17,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1375105382] [2021-12-22 10:42:17,048 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1375105382] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 10:42:17,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2123180890] [2021-12-22 10:42:17,048 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-22 10:42:17,048 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:42:17,048 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:42:17,049 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:42:17,051 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-12-22 10:42:17,223 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2021-12-22 10:42:17,223 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 10:42:17,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 56 conjunts are in the unsatisfiable core [2021-12-22 10:42:17,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:42:17,298 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-22 10:42:17,348 INFO L353 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-12-22 10:42:17,348 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 26 [2021-12-22 10:42:17,782 INFO L134 CoverageAnalysis]: Checked inductivity of 344 backedges. 0 proven. 344 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:42:17,782 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:42:17,962 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-12-22 10:42:17,964 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2021-12-22 10:42:18,038 INFO L134 CoverageAnalysis]: Checked inductivity of 344 backedges. 0 proven. 344 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:42:18,038 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2123180890] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:42:18,038 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 10:42:18,038 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 42 [2021-12-22 10:42:18,038 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759115324] [2021-12-22 10:42:18,038 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 10:42:18,039 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-12-22 10:42:18,039 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:42:18,039 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-12-22 10:42:18,039 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=1610, Unknown=0, NotChecked=0, Total=1722 [2021-12-22 10:42:18,039 INFO L87 Difference]: Start difference. First operand 110 states and 112 transitions. Second operand has 42 states, 42 states have (on average 2.880952380952381) internal successors, (121), 42 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:42:18,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:42:18,821 INFO L93 Difference]: Finished difference Result 204 states and 207 transitions. [2021-12-22 10:42:18,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-12-22 10:42:18,821 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.880952380952381) internal successors, (121), 42 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 72 [2021-12-22 10:42:18,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:42:18,822 INFO L225 Difference]: With dead ends: 204 [2021-12-22 10:42:18,822 INFO L226 Difference]: Without dead ends: 202 [2021-12-22 10:42:18,823 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 124 SyntacticMatches, 6 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 430 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=209, Invalid=2871, Unknown=0, NotChecked=0, Total=3080 [2021-12-22 10:42:18,823 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 38 mSDsluCounter, 783 mSDsCounter, 0 mSdLazyCounter, 1524 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 812 SdHoareTripleChecker+Invalid, 1558 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 1524 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 2 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-22 10:42:18,823 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 812 Invalid, 1558 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 1524 Invalid, 0 Unknown, 2 Unchecked, 0.5s Time] [2021-12-22 10:42:18,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2021-12-22 10:42:18,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 113. [2021-12-22 10:42:18,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 112 states have (on average 1.0357142857142858) internal successors, (116), 112 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:42:18,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 116 transitions. [2021-12-22 10:42:18,862 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 116 transitions. Word has length 72 [2021-12-22 10:42:18,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:42:18,862 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 116 transitions. [2021-12-22 10:42:18,862 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 2.880952380952381) internal successors, (121), 42 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:42:18,862 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 116 transitions. [2021-12-22 10:42:18,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-12-22 10:42:18,863 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:42:18,863 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:42:18,881 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-12-22 10:42:19,067 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-12-22 10:42:19,067 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 10:42:19,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 10:42:19,068 INFO L85 PathProgramCache]: Analyzing trace with hash 1248242101, now seen corresponding path program 24 times [2021-12-22 10:42:19,068 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 10:42:19,068 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1934157907] [2021-12-22 10:42:19,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 10:42:19,068 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 10:42:19,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 10:42:19,515 INFO L134 CoverageAnalysis]: Checked inductivity of 369 backedges. 0 proven. 369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 10:42:19,516 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 10:42:19,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1934157907] [2021-12-22 10:42:19,516 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1934157907] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 10:42:19,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [746069495] [2021-12-22 10:42:19,517 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-22 10:42:19,517 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 10:42:19,517 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 10:42:19,519 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 10:42:19,520 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-12-22 10:42:19,832 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 14 check-sat command(s) [2021-12-22 10:42:19,832 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 10:42:19,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 60 conjunts are in the unsatisfiable core [2021-12-22 10:42:19,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 10:42:19,904 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-22 10:42:19,939 INFO L353 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-12-22 10:42:19,939 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-12-22 10:42:19,951 INFO L353 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-12-22 10:42:19,951 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-12-22 10:42:20,380 INFO L134 CoverageAnalysis]: Checked inductivity of 369 backedges. 0 proven. 367 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-22 10:42:20,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 10:42:20,819 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~i~0#1| Int)) (= (select (store (select |c_#memory_int| |c_ULTIMATE.start_main_~x~0#1.base|) (+ |c_ULTIMATE.start_main_~x~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4)) 0) (+ 40 |c_ULTIMATE.start_main_~x~0#1.offset|)) 0)) is different from false [2021-12-22 10:42:20,889 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-12-22 10:42:20,891 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2021-12-22 10:42:20,964 INFO L134 CoverageAnalysis]: Checked inductivity of 369 backedges. 0 proven. 344 refuted. 0 times theorem prover too weak. 0 trivial. 25 not checked. [2021-12-22 10:42:20,965 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [746069495] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 10:42:20,965 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 10:42:20,965 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 29] total 43 [2021-12-22 10:42:20,965 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640138624] [2021-12-22 10:42:20,965 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 10:42:20,965 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-12-22 10:42:20,965 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 10:42:20,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-12-22 10:42:20,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1611, Unknown=1, NotChecked=80, Total=1806 [2021-12-22 10:42:20,966 INFO L87 Difference]: Start difference. First operand 113 states and 116 transitions. Second operand has 43 states, 43 states have (on average 2.9302325581395348) internal successors, (126), 43 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:42:21,615 WARN L838 $PredicateComparison]: unable to prove that (and (<= 11 |c_ULTIMATE.start_main_~i~0#1|) (= 0 (select (select |c_#memory_int| |c_ULTIMATE.start_main_~x~0#1.base|) (+ 40 |c_ULTIMATE.start_main_~x~0#1.offset|))) (forall ((|ULTIMATE.start_main_~i~0#1| Int)) (= (select (store (select |c_#memory_int| |c_ULTIMATE.start_main_~x~0#1.base|) (+ |c_ULTIMATE.start_main_~x~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4)) 0) (+ 40 |c_ULTIMATE.start_main_~x~0#1.offset|)) 0))) is different from false [2021-12-22 10:42:21,987 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (+ 40 |c_ULTIMATE.start_main_~x~0#1.offset|))) (and (= 0 (select (select |c_#memory_int| |c_ULTIMATE.start_main_~x~0#1.base|) .cse0)) (forall ((|ULTIMATE.start_main_~i~0#1| Int)) (= (select (store (select |c_#memory_int| |c_ULTIMATE.start_main_~x~0#1.base|) (+ |c_ULTIMATE.start_main_~x~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4)) 0) (+ 40 |c_ULTIMATE.start_main_~x~0#1.offset|)) 0)) (not (= (+ |c_ULTIMATE.start_main_~x~0#1.offset| (* |c_ULTIMATE.start_main_~i~0#1| 4)) .cse0)))) is different from false [2021-12-22 10:42:22,318 WARN L838 $PredicateComparison]: unable to prove that (and (= 0 (select (select |c_#memory_int| |c_ULTIMATE.start_main_~x~0#1.base|) (+ 40 |c_ULTIMATE.start_main_~x~0#1.offset|))) (forall ((|ULTIMATE.start_main_~i~0#1| Int)) (= (select (store (select |c_#memory_int| |c_ULTIMATE.start_main_~x~0#1.base|) (+ |c_ULTIMATE.start_main_~x~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4)) 0) (+ 40 |c_ULTIMATE.start_main_~x~0#1.offset|)) 0))) is different from false [2021-12-22 10:42:23,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 10:42:23,201 INFO L93 Difference]: Finished difference Result 210 states and 214 transitions. [2021-12-22 10:42:23,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-12-22 10:42:23,201 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.9302325581395348) internal successors, (126), 43 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-12-22 10:42:23,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 10:42:23,202 INFO L225 Difference]: With dead ends: 210 [2021-12-22 10:42:23,202 INFO L226 Difference]: Without dead ends: 208 [2021-12-22 10:42:23,203 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 128 SyntacticMatches, 7 SemanticMatches, 82 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 1293 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=475, Invalid=5857, Unknown=4, NotChecked=636, Total=6972 [2021-12-22 10:42:23,204 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 100 mSDsluCounter, 731 mSDsCounter, 0 mSdLazyCounter, 1466 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 760 SdHoareTripleChecker+Invalid, 1672 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 1466 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 106 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-22 10:42:23,204 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 760 Invalid, 1672 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 1466 Invalid, 0 Unknown, 106 Unchecked, 0.6s Time] [2021-12-22 10:42:23,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-12-22 10:42:23,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 110. [2021-12-22 10:42:23,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 109 states have (on average 1.0275229357798166) internal successors, (112), 109 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:42:23,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 112 transitions. [2021-12-22 10:42:23,249 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 112 transitions. Word has length 74 [2021-12-22 10:42:23,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 10:42:23,249 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 112 transitions. [2021-12-22 10:42:23,249 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.9302325581395348) internal successors, (126), 43 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 10:42:23,249 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 112 transitions. [2021-12-22 10:42:23,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-12-22 10:42:23,250 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 10:42:23,250 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 10:42:23,275 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0