./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/reducercommutativity/sep.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 26d01a9c 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/reducercommutativity/sep.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 54d2da4a9e5a645ffa7361038eff25cc32e29a265e0324de9bda9a6d773becac --- Real Ultimate output --- This is Ultimate 0.2.2-?-26d01a9 [2023-02-16 23:20:14,193 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-02-16 23:20:14,194 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-02-16 23:20:14,219 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-02-16 23:20:14,220 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-02-16 23:20:14,221 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-02-16 23:20:14,222 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-02-16 23:20:14,223 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-02-16 23:20:14,225 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-02-16 23:20:14,225 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-02-16 23:20:14,226 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-02-16 23:20:14,227 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-02-16 23:20:14,228 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-02-16 23:20:14,229 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-02-16 23:20:14,229 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-02-16 23:20:14,230 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-02-16 23:20:14,231 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-02-16 23:20:14,232 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-02-16 23:20:14,233 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-02-16 23:20:14,235 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-02-16 23:20:14,236 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-02-16 23:20:14,237 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-02-16 23:20:14,238 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-02-16 23:20:14,239 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-02-16 23:20:14,241 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-02-16 23:20:14,242 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-02-16 23:20:14,242 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-02-16 23:20:14,243 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-02-16 23:20:14,243 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-02-16 23:20:14,244 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-02-16 23:20:14,244 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-02-16 23:20:14,245 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-02-16 23:20:14,246 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-02-16 23:20:14,247 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-02-16 23:20:14,247 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-02-16 23:20:14,248 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-02-16 23:20:14,248 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-02-16 23:20:14,249 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-02-16 23:20:14,249 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-02-16 23:20:14,250 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-02-16 23:20:14,250 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-02-16 23:20:14,251 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2023-02-16 23:20:14,270 INFO L113 SettingsManager]: Loading preferences was successful [2023-02-16 23:20:14,270 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-02-16 23:20:14,271 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-02-16 23:20:14,271 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-02-16 23:20:14,272 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-02-16 23:20:14,272 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-02-16 23:20:14,272 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-02-16 23:20:14,273 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2023-02-16 23:20:14,273 INFO L138 SettingsManager]: * Use SBE=true [2023-02-16 23:20:14,273 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-02-16 23:20:14,273 INFO L138 SettingsManager]: * sizeof long=4 [2023-02-16 23:20:14,274 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-02-16 23:20:14,274 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-02-16 23:20:14,274 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-02-16 23:20:14,274 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-02-16 23:20:14,274 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-02-16 23:20:14,275 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-02-16 23:20:14,275 INFO L138 SettingsManager]: * sizeof long double=12 [2023-02-16 23:20:14,275 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-02-16 23:20:14,275 INFO L138 SettingsManager]: * Use constant arrays=true [2023-02-16 23:20:14,276 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-02-16 23:20:14,276 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-02-16 23:20:14,276 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-02-16 23:20:14,276 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-02-16 23:20:14,276 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-02-16 23:20:14,277 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-02-16 23:20:14,277 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-02-16 23:20:14,277 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-02-16 23:20:14,277 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2023-02-16 23:20:14,277 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-02-16 23:20:14,277 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-02-16 23:20:14,278 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-02-16 23:20:14,278 INFO L138 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-02-16 23:20:14,278 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-02-16 23:20:14,278 INFO L138 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC [2023-02-16 23:20:14,278 INFO L138 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 54d2da4a9e5a645ffa7361038eff25cc32e29a265e0324de9bda9a6d773becac [2023-02-16 23:20:14,470 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-02-16 23:20:14,493 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-02-16 23:20:14,496 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-02-16 23:20:14,497 INFO L271 PluginConnector]: Initializing CDTParser... [2023-02-16 23:20:14,497 INFO L275 PluginConnector]: CDTParser initialized [2023-02-16 23:20:14,498 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/reducercommutativity/sep.i [2023-02-16 23:20:15,733 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-02-16 23:20:15,903 INFO L351 CDTParser]: Found 1 translation units. [2023-02-16 23:20:15,904 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/reducercommutativity/sep.i [2023-02-16 23:20:15,909 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ec3a78d56/75486342d2cf4132ac6ebb5149119cb1/FLAG63a5639a1 [2023-02-16 23:20:15,926 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ec3a78d56/75486342d2cf4132ac6ebb5149119cb1 [2023-02-16 23:20:15,929 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-02-16 23:20:15,930 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2023-02-16 23:20:15,931 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-02-16 23:20:15,931 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-02-16 23:20:15,934 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-02-16 23:20:15,935 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.02 11:20:15" (1/1) ... [2023-02-16 23:20:15,935 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2862d878 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.02 11:20:15, skipping insertion in model container [2023-02-16 23:20:15,936 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.02 11:20:15" (1/1) ... [2023-02-16 23:20:15,942 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-02-16 23:20:15,958 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-02-16 23:20:16,079 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/reducercommutativity/sep.i[1298,1311] [2023-02-16 23:20:16,086 INFO L210 PostProcessor]: Analyzing one entry point: main [2023-02-16 23:20:16,093 INFO L203 MainTranslator]: Completed pre-run [2023-02-16 23:20:16,108 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/reducercommutativity/sep.i[1298,1311] [2023-02-16 23:20:16,109 INFO L210 PostProcessor]: Analyzing one entry point: main [2023-02-16 23:20:16,120 INFO L208 MainTranslator]: Completed translation [2023-02-16 23:20:16,120 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.02 11:20:16 WrapperNode [2023-02-16 23:20:16,121 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-02-16 23:20:16,121 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-02-16 23:20:16,122 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-02-16 23:20:16,122 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2023-02-16 23:20:16,126 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.02 11:20:16" (1/1) ... [2023-02-16 23:20:16,132 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.02 11:20:16" (1/1) ... [2023-02-16 23:20:16,147 INFO L138 Inliner]: procedures = 16, calls = 26, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 65 [2023-02-16 23:20:16,148 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-02-16 23:20:16,148 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-02-16 23:20:16,149 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-02-16 23:20:16,149 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-02-16 23:20:16,157 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.02 11:20:16" (1/1) ... [2023-02-16 23:20:16,157 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.02 11:20:16" (1/1) ... [2023-02-16 23:20:16,159 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.02 11:20:16" (1/1) ... [2023-02-16 23:20:16,159 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.02 11:20:16" (1/1) ... [2023-02-16 23:20:16,164 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.02 11:20:16" (1/1) ... [2023-02-16 23:20:16,171 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.02 11:20:16" (1/1) ... [2023-02-16 23:20:16,172 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.02 11:20:16" (1/1) ... [2023-02-16 23:20:16,178 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.02 11:20:16" (1/1) ... [2023-02-16 23:20:16,180 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-02-16 23:20:16,181 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-02-16 23:20:16,182 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-02-16 23:20:16,182 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-02-16 23:20:16,182 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.02 11:20:16" (1/1) ... [2023-02-16 23:20:16,187 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-02-16 23:20:16,196 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-02-16 23:20:16,209 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) [2023-02-16 23:20:16,210 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 [2023-02-16 23:20:16,236 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-02-16 23:20:16,237 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-02-16 23:20:16,237 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-02-16 23:20:16,237 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-02-16 23:20:16,237 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-02-16 23:20:16,237 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-02-16 23:20:16,237 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-02-16 23:20:16,238 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-02-16 23:20:16,238 INFO L130 BoogieDeclarations]: Found specification of procedure sep [2023-02-16 23:20:16,238 INFO L138 BoogieDeclarations]: Found implementation of procedure sep [2023-02-16 23:20:16,300 INFO L235 CfgBuilder]: Building ICFG [2023-02-16 23:20:16,302 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2023-02-16 23:20:16,429 INFO L276 CfgBuilder]: Performing block encoding [2023-02-16 23:20:16,436 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-02-16 23:20:16,437 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2023-02-16 23:20:16,438 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.02 11:20:16 BoogieIcfgContainer [2023-02-16 23:20:16,438 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-02-16 23:20:16,440 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-02-16 23:20:16,441 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-02-16 23:20:16,443 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-02-16 23:20:16,444 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 16.02 11:20:15" (1/3) ... [2023-02-16 23:20:16,444 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14ce2234 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.02 11:20:16, skipping insertion in model container [2023-02-16 23:20:16,444 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.02 11:20:16" (2/3) ... [2023-02-16 23:20:16,445 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14ce2234 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.02 11:20:16, skipping insertion in model container [2023-02-16 23:20:16,445 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.02 11:20:16" (3/3) ... [2023-02-16 23:20:16,446 INFO L112 eAbstractionObserver]: Analyzing ICFG sep.i [2023-02-16 23:20:16,462 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-02-16 23:20:16,462 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-02-16 23:20:16,533 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-02-16 23:20:16,540 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@878f9c7, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-02-16 23:20:16,540 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-02-16 23:20:16,544 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 21 states have (on average 1.380952380952381) internal successors, (29), 22 states have internal predecessors, (29), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-02-16 23:20:16,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-02-16 23:20:16,562 INFO L187 NwaCegarLoop]: Found error trace [2023-02-16 23:20:16,563 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-16 23:20:16,563 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-16 23:20:16,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-16 23:20:16,569 INFO L85 PathProgramCache]: Analyzing trace with hash -1158480486, now seen corresponding path program 1 times [2023-02-16 23:20:16,577 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-16 23:20:16,579 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [702779951] [2023-02-16 23:20:16,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-16 23:20:16,580 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-16 23:20:16,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:16,877 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2023-02-16 23:20:16,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:16,943 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2023-02-16 23:20:16,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:16,966 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2023-02-16 23:20:16,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:16,988 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-02-16 23:20:16,988 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-16 23:20:16,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [702779951] [2023-02-16 23:20:16,989 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [702779951] provided 0 perfect and 1 imperfect interpolant sequences [2023-02-16 23:20:16,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2082375793] [2023-02-16 23:20:16,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-16 23:20:16,990 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-16 23:20:16,990 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-02-16 23:20:17,021 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) [2023-02-16 23:20:17,107 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-02-16 23:20:17,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:17,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 1 conjunts are in the unsatisfiable core [2023-02-16 23:20:17,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-02-16 23:20:17,229 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-02-16 23:20:17,229 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-02-16 23:20:17,229 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2082375793] provided 1 perfect and 0 imperfect interpolant sequences [2023-02-16 23:20:17,230 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-02-16 23:20:17,230 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 5 [2023-02-16 23:20:17,232 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [314314630] [2023-02-16 23:20:17,233 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-02-16 23:20:17,237 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-02-16 23:20:17,237 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-16 23:20:17,262 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-02-16 23:20:17,263 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-02-16 23:20:17,265 INFO L87 Difference]: Start difference. First operand has 27 states, 21 states have (on average 1.380952380952381) internal successors, (29), 22 states have internal predecessors, (29), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 2 states, 2 states have (on average 9.0) internal successors, (18), 2 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-02-16 23:20:17,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-16 23:20:17,280 INFO L93 Difference]: Finished difference Result 50 states and 67 transitions. [2023-02-16 23:20:17,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-02-16 23:20:17,282 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 9.0) internal successors, (18), 2 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 28 [2023-02-16 23:20:17,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-16 23:20:17,288 INFO L225 Difference]: With dead ends: 50 [2023-02-16 23:20:17,288 INFO L226 Difference]: Without dead ends: 22 [2023-02-16 23:20:17,291 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-02-16 23:20:17,294 INFO L413 NwaCegarLoop]: 32 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, 32 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 [2023-02-16 23:20:17,296 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-02-16 23:20:17,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-02-16 23:20:17,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-02-16 23:20:17,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-02-16 23:20:17,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2023-02-16 23:20:17,325 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 28 [2023-02-16 23:20:17,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-16 23:20:17,326 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2023-02-16 23:20:17,327 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 9.0) internal successors, (18), 2 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-02-16 23:20:17,327 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2023-02-16 23:20:17,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-02-16 23:20:17,328 INFO L187 NwaCegarLoop]: Found error trace [2023-02-16 23:20:17,328 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-16 23:20:17,337 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-02-16 23:20:17,534 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-02-16 23:20:17,535 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-16 23:20:17,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-16 23:20:17,536 INFO L85 PathProgramCache]: Analyzing trace with hash 1033293076, now seen corresponding path program 1 times [2023-02-16 23:20:17,536 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-16 23:20:17,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1595191801] [2023-02-16 23:20:17,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-16 23:20:17,537 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-16 23:20:17,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:17,613 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2023-02-16 23:20:17,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:17,635 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2023-02-16 23:20:17,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:17,645 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2023-02-16 23:20:17,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:17,651 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-02-16 23:20:17,651 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-16 23:20:17,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1595191801] [2023-02-16 23:20:17,652 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1595191801] provided 0 perfect and 1 imperfect interpolant sequences [2023-02-16 23:20:17,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1778601621] [2023-02-16 23:20:17,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-16 23:20:17,652 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-16 23:20:17,653 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-02-16 23:20:17,654 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) [2023-02-16 23:20:17,673 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-02-16 23:20:17,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:17,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 3 conjunts are in the unsatisfiable core [2023-02-16 23:20:17,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-02-16 23:20:17,788 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-02-16 23:20:17,788 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-02-16 23:20:17,789 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1778601621] provided 1 perfect and 0 imperfect interpolant sequences [2023-02-16 23:20:17,789 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-02-16 23:20:17,789 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 6 [2023-02-16 23:20:17,789 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648474529] [2023-02-16 23:20:17,789 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-02-16 23:20:17,791 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-02-16 23:20:17,791 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-16 23:20:17,792 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-02-16 23:20:17,793 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-02-16 23:20:17,793 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2023-02-16 23:20:17,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-16 23:20:17,843 INFO L93 Difference]: Finished difference Result 43 states and 55 transitions. [2023-02-16 23:20:17,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-02-16 23:20:17,844 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 28 [2023-02-16 23:20:17,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-16 23:20:17,845 INFO L225 Difference]: With dead ends: 43 [2023-02-16 23:20:17,845 INFO L226 Difference]: Without dead ends: 25 [2023-02-16 23:20:17,846 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-02-16 23:20:17,848 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 28 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 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 [2023-02-16 23:20:17,853 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 30 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-02-16 23:20:17,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-02-16 23:20:17,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2023-02-16 23:20:17,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-02-16 23:20:17,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2023-02-16 23:20:17,867 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 28 [2023-02-16 23:20:17,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-16 23:20:17,867 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2023-02-16 23:20:17,867 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2023-02-16 23:20:17,867 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2023-02-16 23:20:17,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-02-16 23:20:17,869 INFO L187 NwaCegarLoop]: Found error trace [2023-02-16 23:20:17,869 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-16 23:20:17,875 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-02-16 23:20:18,075 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-02-16 23:20:18,075 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-16 23:20:18,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-16 23:20:18,076 INFO L85 PathProgramCache]: Analyzing trace with hash -14370886, now seen corresponding path program 1 times [2023-02-16 23:20:18,076 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-16 23:20:18,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [997285657] [2023-02-16 23:20:18,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-16 23:20:18,077 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-16 23:20:18,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:18,208 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2023-02-16 23:20:18,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:18,236 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-02-16 23:20:18,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:18,258 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2023-02-16 23:20:18,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:18,274 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-02-16 23:20:18,280 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-16 23:20:18,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [997285657] [2023-02-16 23:20:18,283 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [997285657] provided 1 perfect and 0 imperfect interpolant sequences [2023-02-16 23:20:18,283 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-02-16 23:20:18,284 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-02-16 23:20:18,284 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164000621] [2023-02-16 23:20:18,284 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-02-16 23:20:18,284 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-02-16 23:20:18,285 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-16 23:20:18,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-02-16 23:20:18,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-02-16 23:20:18,287 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-02-16 23:20:18,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-16 23:20:18,317 INFO L93 Difference]: Finished difference Result 39 states and 45 transitions. [2023-02-16 23:20:18,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-02-16 23:20:18,318 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 37 [2023-02-16 23:20:18,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-16 23:20:18,319 INFO L225 Difference]: With dead ends: 39 [2023-02-16 23:20:18,319 INFO L226 Difference]: Without dead ends: 25 [2023-02-16 23:20:18,319 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-02-16 23:20:18,320 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 21 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-02-16 23:20:18,321 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 30 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-02-16 23:20:18,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-02-16 23:20:18,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2023-02-16 23:20:18,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-02-16 23:20:18,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2023-02-16 23:20:18,325 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 37 [2023-02-16 23:20:18,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-16 23:20:18,326 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2023-02-16 23:20:18,326 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-02-16 23:20:18,326 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2023-02-16 23:20:18,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-02-16 23:20:18,327 INFO L187 NwaCegarLoop]: Found error trace [2023-02-16 23:20:18,327 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-16 23:20:18,327 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-02-16 23:20:18,328 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-16 23:20:18,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-16 23:20:18,328 INFO L85 PathProgramCache]: Analyzing trace with hash 1444896732, now seen corresponding path program 1 times [2023-02-16 23:20:18,328 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-16 23:20:18,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882487746] [2023-02-16 23:20:18,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-16 23:20:18,329 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-16 23:20:18,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:18,387 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2023-02-16 23:20:18,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:18,408 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-02-16 23:20:18,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:18,415 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2023-02-16 23:20:18,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:18,421 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-02-16 23:20:18,422 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-16 23:20:18,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882487746] [2023-02-16 23:20:18,422 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [882487746] provided 0 perfect and 1 imperfect interpolant sequences [2023-02-16 23:20:18,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2131392] [2023-02-16 23:20:18,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-16 23:20:18,423 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-16 23:20:18,423 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-02-16 23:20:18,424 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) [2023-02-16 23:20:18,449 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-02-16 23:20:18,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:18,509 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 4 conjunts are in the unsatisfiable core [2023-02-16 23:20:18,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-02-16 23:20:18,548 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 14 proven. 1 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-02-16 23:20:18,548 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-02-16 23:20:18,599 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-02-16 23:20:18,599 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2131392] provided 0 perfect and 2 imperfect interpolant sequences [2023-02-16 23:20:18,602 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-02-16 23:20:18,602 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 6] total 10 [2023-02-16 23:20:18,602 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [319642343] [2023-02-16 23:20:18,603 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-02-16 23:20:18,603 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-02-16 23:20:18,603 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-16 23:20:18,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-02-16 23:20:18,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2023-02-16 23:20:18,605 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 10 states, 10 states have (on average 4.3) internal successors, (43), 10 states have internal predecessors, (43), 2 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 1 states have call predecessors, (6), 2 states have call successors, (6) [2023-02-16 23:20:18,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-16 23:20:18,696 INFO L93 Difference]: Finished difference Result 49 states and 62 transitions. [2023-02-16 23:20:18,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-02-16 23:20:18,696 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.3) internal successors, (43), 10 states have internal predecessors, (43), 2 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 1 states have call predecessors, (6), 2 states have call successors, (6) Word has length 39 [2023-02-16 23:20:18,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-16 23:20:18,699 INFO L225 Difference]: With dead ends: 49 [2023-02-16 23:20:18,699 INFO L226 Difference]: Without dead ends: 29 [2023-02-16 23:20:18,700 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 75 SyntacticMatches, 5 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2023-02-16 23:20:18,702 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 28 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-02-16 23:20:18,704 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 65 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-02-16 23:20:18,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-02-16 23:20:18,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2023-02-16 23:20:18,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 22 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-02-16 23:20:18,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 32 transitions. [2023-02-16 23:20:18,716 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 32 transitions. Word has length 39 [2023-02-16 23:20:18,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-16 23:20:18,716 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 32 transitions. [2023-02-16 23:20:18,717 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 4.3) internal successors, (43), 10 states have internal predecessors, (43), 2 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 1 states have call predecessors, (6), 2 states have call successors, (6) [2023-02-16 23:20:18,718 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 32 transitions. [2023-02-16 23:20:18,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-02-16 23:20:18,721 INFO L187 NwaCegarLoop]: Found error trace [2023-02-16 23:20:18,721 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-16 23:20:18,729 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-02-16 23:20:18,927 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-16 23:20:18,928 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-16 23:20:18,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-16 23:20:18,928 INFO L85 PathProgramCache]: Analyzing trace with hash -1089239822, now seen corresponding path program 2 times [2023-02-16 23:20:18,928 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-16 23:20:18,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2009990058] [2023-02-16 23:20:18,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-16 23:20:18,929 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-16 23:20:19,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:19,616 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2023-02-16 23:20:19,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:19,722 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2023-02-16 23:20:19,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:19,852 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2023-02-16 23:20:19,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:19,980 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 3 proven. 48 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-02-16 23:20:19,980 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-16 23:20:19,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2009990058] [2023-02-16 23:20:19,991 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2009990058] provided 0 perfect and 1 imperfect interpolant sequences [2023-02-16 23:20:19,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [80389359] [2023-02-16 23:20:19,992 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-02-16 23:20:19,993 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-16 23:20:19,993 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-02-16 23:20:19,994 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) [2023-02-16 23:20:19,997 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-02-16 23:20:20,072 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-02-16 23:20:20,072 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-02-16 23:20:20,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 37 conjunts are in the unsatisfiable core [2023-02-16 23:20:20,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-02-16 23:20:24,843 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-02-16 23:20:24,843 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-02-16 23:20:25,004 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-02-16 23:20:25,006 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [80389359] provided 0 perfect and 2 imperfect interpolant sequences [2023-02-16 23:20:25,006 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-02-16 23:20:25,006 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 18 [2023-02-16 23:20:25,006 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [943833658] [2023-02-16 23:20:25,006 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-02-16 23:20:25,008 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-02-16 23:20:25,008 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-16 23:20:25,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-02-16 23:20:25,010 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=260, Unknown=0, NotChecked=0, Total=306 [2023-02-16 23:20:25,010 INFO L87 Difference]: Start difference. First operand 27 states and 32 transitions. Second operand has 18 states, 17 states have (on average 2.176470588235294) internal successors, (37), 14 states have internal predecessors, (37), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-02-16 23:20:25,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-16 23:20:25,218 INFO L93 Difference]: Finished difference Result 73 states and 101 transitions. [2023-02-16 23:20:25,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-02-16 23:20:25,218 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.176470588235294) internal successors, (37), 14 states have internal predecessors, (37), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 48 [2023-02-16 23:20:25,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-16 23:20:25,223 INFO L225 Difference]: With dead ends: 73 [2023-02-16 23:20:25,223 INFO L226 Difference]: Without dead ends: 69 [2023-02-16 23:20:25,224 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 76 SyntacticMatches, 25 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2023-02-16 23:20:25,224 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 31 mSDsluCounter, 428 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 478 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-02-16 23:20:25,225 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 478 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-02-16 23:20:25,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2023-02-16 23:20:25,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 49. [2023-02-16 23:20:25,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 41 states have (on average 1.2682926829268293) internal successors, (52), 42 states have internal predecessors, (52), 5 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (9), 5 states have call predecessors, (9), 5 states have call successors, (9) [2023-02-16 23:20:25,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 66 transitions. [2023-02-16 23:20:25,251 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 66 transitions. Word has length 48 [2023-02-16 23:20:25,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-16 23:20:25,252 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 66 transitions. [2023-02-16 23:20:25,253 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.176470588235294) internal successors, (37), 14 states have internal predecessors, (37), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-02-16 23:20:25,254 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 66 transitions. [2023-02-16 23:20:25,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-02-16 23:20:25,259 INFO L187 NwaCegarLoop]: Found error trace [2023-02-16 23:20:25,259 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-16 23:20:25,268 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-02-16 23:20:25,465 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-16 23:20:25,466 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-16 23:20:25,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-16 23:20:25,466 INFO L85 PathProgramCache]: Analyzing trace with hash -409181452, now seen corresponding path program 1 times [2023-02-16 23:20:25,466 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-16 23:20:25,467 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [752789015] [2023-02-16 23:20:25,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-16 23:20:25,467 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-16 23:20:25,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:25,990 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2023-02-16 23:20:25,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:26,056 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2023-02-16 23:20:26,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:26,217 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2023-02-16 23:20:26,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:26,449 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 4 proven. 71 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-02-16 23:20:26,450 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-16 23:20:26,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [752789015] [2023-02-16 23:20:26,450 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [752789015] provided 0 perfect and 1 imperfect interpolant sequences [2023-02-16 23:20:26,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1343145478] [2023-02-16 23:20:26,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-16 23:20:26,450 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-16 23:20:26,450 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-02-16 23:20:26,452 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) [2023-02-16 23:20:26,454 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-02-16 23:20:26,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:26,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 42 conjunts are in the unsatisfiable core [2023-02-16 23:20:26,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-02-16 23:20:26,722 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 21 [2023-02-16 23:20:26,738 INFO L350 Elim1Store]: Elim1 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 17 treesize of output 13 [2023-02-16 23:20:27,891 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 69 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-02-16 23:20:27,892 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-02-16 23:20:28,137 INFO L350 Elim1Store]: Elim1 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 48 treesize of output 44 [2023-02-16 23:20:28,141 INFO L350 Elim1Store]: Elim1 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 102 treesize of output 86 [2023-02-16 23:20:28,147 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 22 [2023-02-16 23:20:28,150 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-02-16 23:20:28,260 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-02-16 23:20:28,262 INFO L350 Elim1Store]: Elim1 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 118 treesize of output 86 [2023-02-16 23:20:28,404 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-02-16 23:20:28,405 INFO L350 Elim1Store]: Elim1 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 118 treesize of output 97 [2023-02-16 23:20:28,665 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 4 proven. 69 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-02-16 23:20:28,665 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1343145478] provided 0 perfect and 2 imperfect interpolant sequences [2023-02-16 23:20:28,665 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-02-16 23:20:28,665 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 20, 18] total 48 [2023-02-16 23:20:28,665 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374127160] [2023-02-16 23:20:28,666 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-02-16 23:20:28,666 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2023-02-16 23:20:28,666 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-16 23:20:28,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2023-02-16 23:20:28,668 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=277, Invalid=1979, Unknown=0, NotChecked=0, Total=2256 [2023-02-16 23:20:28,668 INFO L87 Difference]: Start difference. First operand 49 states and 66 transitions. Second operand has 48 states, 44 states have (on average 2.340909090909091) internal successors, (103), 45 states have internal predecessors, (103), 7 states have call successors, (9), 4 states have call predecessors, (9), 8 states have return successors, (8), 5 states have call predecessors, (8), 7 states have call successors, (8) [2023-02-16 23:20:33,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-16 23:20:33,677 INFO L93 Difference]: Finished difference Result 388 states and 658 transitions. [2023-02-16 23:20:33,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2023-02-16 23:20:33,677 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 44 states have (on average 2.340909090909091) internal successors, (103), 45 states have internal predecessors, (103), 7 states have call successors, (9), 4 states have call predecessors, (9), 8 states have return successors, (8), 5 states have call predecessors, (8), 7 states have call successors, (8) Word has length 48 [2023-02-16 23:20:33,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-16 23:20:33,682 INFO L225 Difference]: With dead ends: 388 [2023-02-16 23:20:33,683 INFO L226 Difference]: Without dead ends: 329 [2023-02-16 23:20:33,691 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 63 SyntacticMatches, 11 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7296 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=2898, Invalid=19154, Unknown=0, NotChecked=0, Total=22052 [2023-02-16 23:20:33,692 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 378 mSDsluCounter, 451 mSDsCounter, 0 mSdLazyCounter, 1682 mSolverCounterSat, 216 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 386 SdHoareTripleChecker+Valid, 484 SdHoareTripleChecker+Invalid, 1898 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 216 IncrementalHoareTripleChecker+Valid, 1682 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2023-02-16 23:20:33,692 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [386 Valid, 484 Invalid, 1898 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [216 Valid, 1682 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2023-02-16 23:20:33,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2023-02-16 23:20:33,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 155. [2023-02-16 23:20:33,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 132 states have (on average 1.2575757575757576) internal successors, (166), 137 states have internal predecessors, (166), 13 states have call successors, (13), 4 states have call predecessors, (13), 9 states have return successors, (45), 13 states have call predecessors, (45), 13 states have call successors, (45) [2023-02-16 23:20:33,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 224 transitions. [2023-02-16 23:20:33,762 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 224 transitions. Word has length 48 [2023-02-16 23:20:33,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-16 23:20:33,762 INFO L495 AbstractCegarLoop]: Abstraction has 155 states and 224 transitions. [2023-02-16 23:20:33,763 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 44 states have (on average 2.340909090909091) internal successors, (103), 45 states have internal predecessors, (103), 7 states have call successors, (9), 4 states have call predecessors, (9), 8 states have return successors, (8), 5 states have call predecessors, (8), 7 states have call successors, (8) [2023-02-16 23:20:33,763 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 224 transitions. [2023-02-16 23:20:33,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-02-16 23:20:33,766 INFO L187 NwaCegarLoop]: Found error trace [2023-02-16 23:20:33,767 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-16 23:20:33,775 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-02-16 23:20:33,975 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-16 23:20:33,975 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-16 23:20:33,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-16 23:20:33,976 INFO L85 PathProgramCache]: Analyzing trace with hash 296963572, now seen corresponding path program 2 times [2023-02-16 23:20:33,976 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-16 23:20:33,976 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1320028930] [2023-02-16 23:20:33,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-16 23:20:33,977 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-16 23:20:34,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:34,489 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2023-02-16 23:20:34,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:34,602 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2023-02-16 23:20:34,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:34,752 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2023-02-16 23:20:34,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:34,758 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 2 proven. 67 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-02-16 23:20:34,758 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-16 23:20:34,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1320028930] [2023-02-16 23:20:34,759 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1320028930] provided 0 perfect and 1 imperfect interpolant sequences [2023-02-16 23:20:34,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1935275935] [2023-02-16 23:20:34,759 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-02-16 23:20:34,759 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-16 23:20:34,759 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-02-16 23:20:34,760 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) [2023-02-16 23:20:34,763 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-02-16 23:20:34,832 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-02-16 23:20:34,832 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-02-16 23:20:34,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 42 conjunts are in the unsatisfiable core [2023-02-16 23:20:34,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-02-16 23:20:35,001 INFO L173 IndexEqualityManager]: detected equality via solver [2023-02-16 23:20:35,002 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-02-16 23:20:35,002 INFO L350 Elim1Store]: Elim1 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 49 treesize of output 24 [2023-02-16 23:20:35,034 INFO L350 Elim1Store]: Elim1 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 17 treesize of output 13 [2023-02-16 23:20:35,298 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 69 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-02-16 23:20:35,299 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-02-16 23:20:35,429 INFO L350 Elim1Store]: Elim1 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 74 treesize of output 68 [2023-02-16 23:20:35,431 INFO L350 Elim1Store]: Elim1 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 157 treesize of output 133 [2023-02-16 23:20:35,531 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-02-16 23:20:35,531 INFO L350 Elim1Store]: Elim1 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 301 treesize of output 257 [2023-02-16 23:20:35,681 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-02-16 23:20:35,682 INFO L350 Elim1Store]: Elim1 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 301 treesize of output 268 [2023-02-16 23:20:35,859 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 4 proven. 69 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-02-16 23:20:35,860 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1935275935] provided 0 perfect and 2 imperfect interpolant sequences [2023-02-16 23:20:35,860 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-02-16 23:20:35,860 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 20, 18] total 44 [2023-02-16 23:20:35,860 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287608693] [2023-02-16 23:20:35,860 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-02-16 23:20:35,861 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2023-02-16 23:20:35,861 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-16 23:20:35,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2023-02-16 23:20:35,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=1653, Unknown=0, NotChecked=0, Total=1892 [2023-02-16 23:20:35,862 INFO L87 Difference]: Start difference. First operand 155 states and 224 transitions. Second operand has 44 states, 39 states have (on average 2.717948717948718) internal successors, (106), 40 states have internal predecessors, (106), 9 states have call successors, (9), 4 states have call predecessors, (9), 8 states have return successors, (9), 6 states have call predecessors, (9), 9 states have call successors, (9) [2023-02-16 23:20:39,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-16 23:20:39,556 INFO L93 Difference]: Finished difference Result 569 states and 788 transitions. [2023-02-16 23:20:39,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2023-02-16 23:20:39,556 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 39 states have (on average 2.717948717948718) internal successors, (106), 40 states have internal predecessors, (106), 9 states have call successors, (9), 4 states have call predecessors, (9), 8 states have return successors, (9), 6 states have call predecessors, (9), 9 states have call successors, (9) Word has length 48 [2023-02-16 23:20:39,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-16 23:20:39,559 INFO L225 Difference]: With dead ends: 569 [2023-02-16 23:20:39,559 INFO L226 Difference]: Without dead ends: 424 [2023-02-16 23:20:39,564 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 91 SyntacticMatches, 8 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7321 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2515, Invalid=18077, Unknown=0, NotChecked=0, Total=20592 [2023-02-16 23:20:39,565 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 420 mSDsluCounter, 583 mSDsCounter, 0 mSdLazyCounter, 1561 mSolverCounterSat, 169 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 426 SdHoareTripleChecker+Valid, 625 SdHoareTripleChecker+Invalid, 1730 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 169 IncrementalHoareTripleChecker+Valid, 1561 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2023-02-16 23:20:39,565 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [426 Valid, 625 Invalid, 1730 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [169 Valid, 1561 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2023-02-16 23:20:39,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2023-02-16 23:20:39,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 276. [2023-02-16 23:20:39,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 276 states, 234 states have (on average 1.2692307692307692) internal successors, (297), 248 states have internal predecessors, (297), 20 states have call successors, (20), 7 states have call predecessors, (20), 21 states have return successors, (71), 20 states have call predecessors, (71), 20 states have call successors, (71) [2023-02-16 23:20:39,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 388 transitions. [2023-02-16 23:20:39,629 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 388 transitions. Word has length 48 [2023-02-16 23:20:39,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-16 23:20:39,629 INFO L495 AbstractCegarLoop]: Abstraction has 276 states and 388 transitions. [2023-02-16 23:20:39,629 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 39 states have (on average 2.717948717948718) internal successors, (106), 40 states have internal predecessors, (106), 9 states have call successors, (9), 4 states have call predecessors, (9), 8 states have return successors, (9), 6 states have call predecessors, (9), 9 states have call successors, (9) [2023-02-16 23:20:39,629 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 388 transitions. [2023-02-16 23:20:39,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-02-16 23:20:39,631 INFO L187 NwaCegarLoop]: Found error trace [2023-02-16 23:20:39,631 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-16 23:20:39,643 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-02-16 23:20:39,839 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-16 23:20:39,839 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-16 23:20:39,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-16 23:20:39,839 INFO L85 PathProgramCache]: Analyzing trace with hash 1360360308, now seen corresponding path program 3 times [2023-02-16 23:20:39,839 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-16 23:20:39,846 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1875665845] [2023-02-16 23:20:39,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-16 23:20:39,846 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-16 23:20:39,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:40,158 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2023-02-16 23:20:40,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:40,268 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2023-02-16 23:20:40,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:40,367 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2023-02-16 23:20:40,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:40,373 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 2 proven. 67 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-02-16 23:20:40,373 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-16 23:20:40,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1875665845] [2023-02-16 23:20:40,373 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1875665845] provided 0 perfect and 1 imperfect interpolant sequences [2023-02-16 23:20:40,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1595481440] [2023-02-16 23:20:40,373 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-02-16 23:20:40,374 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-16 23:20:40,374 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-02-16 23:20:40,375 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) [2023-02-16 23:20:40,377 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-02-16 23:20:40,469 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-02-16 23:20:40,469 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-02-16 23:20:40,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 35 conjunts are in the unsatisfiable core [2023-02-16 23:20:40,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-02-16 23:20:40,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-02-16 23:20:40,516 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 41 [2023-02-16 23:20:40,605 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 44 proven. 27 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-02-16 23:20:40,606 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-02-16 23:20:40,698 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-02-16 23:20:40,699 INFO L350 Elim1Store]: Elim1 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 81 treesize of output 37 [2023-02-16 23:20:40,738 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-02-16 23:20:40,739 INFO L350 Elim1Store]: Elim1 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 93 treesize of output 62 [2023-02-16 23:20:40,794 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 3 proven. 65 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-02-16 23:20:40,795 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1595481440] provided 0 perfect and 2 imperfect interpolant sequences [2023-02-16 23:20:40,795 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-02-16 23:20:40,795 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 11] total 24 [2023-02-16 23:20:40,795 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565581483] [2023-02-16 23:20:40,796 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-02-16 23:20:40,796 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-02-16 23:20:40,797 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-16 23:20:40,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-02-16 23:20:40,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2023-02-16 23:20:40,798 INFO L87 Difference]: Start difference. First operand 276 states and 388 transitions. Second operand has 24 states, 21 states have (on average 3.142857142857143) internal successors, (66), 21 states have internal predecessors, (66), 5 states have call successors, (7), 3 states have call predecessors, (7), 5 states have return successors, (7), 3 states have call predecessors, (7), 5 states have call successors, (7) [2023-02-16 23:20:41,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-16 23:20:41,514 INFO L93 Difference]: Finished difference Result 623 states and 826 transitions. [2023-02-16 23:20:41,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-02-16 23:20:41,515 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 21 states have (on average 3.142857142857143) internal successors, (66), 21 states have internal predecessors, (66), 5 states have call successors, (7), 3 states have call predecessors, (7), 5 states have return successors, (7), 3 states have call predecessors, (7), 5 states have call successors, (7) Word has length 48 [2023-02-16 23:20:41,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-16 23:20:41,517 INFO L225 Difference]: With dead ends: 623 [2023-02-16 23:20:41,517 INFO L226 Difference]: Without dead ends: 421 [2023-02-16 23:20:41,519 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 87 SyntacticMatches, 10 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 474 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=285, Invalid=1607, Unknown=0, NotChecked=0, Total=1892 [2023-02-16 23:20:41,519 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 105 mSDsluCounter, 270 mSDsCounter, 0 mSdLazyCounter, 528 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 296 SdHoareTripleChecker+Invalid, 544 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 528 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-02-16 23:20:41,519 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [109 Valid, 296 Invalid, 544 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 528 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-02-16 23:20:41,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 421 states. [2023-02-16 23:20:41,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 421 to 295. [2023-02-16 23:20:41,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 295 states, 254 states have (on average 1.2716535433070866) internal successors, (323), 267 states have internal predecessors, (323), 17 states have call successors, (17), 10 states have call predecessors, (17), 23 states have return successors, (41), 17 states have call predecessors, (41), 17 states have call successors, (41) [2023-02-16 23:20:41,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 381 transitions. [2023-02-16 23:20:41,584 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 381 transitions. Word has length 48 [2023-02-16 23:20:41,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-16 23:20:41,584 INFO L495 AbstractCegarLoop]: Abstraction has 295 states and 381 transitions. [2023-02-16 23:20:41,585 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 21 states have (on average 3.142857142857143) internal successors, (66), 21 states have internal predecessors, (66), 5 states have call successors, (7), 3 states have call predecessors, (7), 5 states have return successors, (7), 3 states have call predecessors, (7), 5 states have call successors, (7) [2023-02-16 23:20:41,585 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 381 transitions. [2023-02-16 23:20:41,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-02-16 23:20:41,586 INFO L187 NwaCegarLoop]: Found error trace [2023-02-16 23:20:41,586 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-16 23:20:41,596 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-02-16 23:20:41,792 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-16 23:20:41,792 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-16 23:20:41,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-16 23:20:41,793 INFO L85 PathProgramCache]: Analyzing trace with hash -868345224, now seen corresponding path program 4 times [2023-02-16 23:20:41,793 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-16 23:20:41,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2112545112] [2023-02-16 23:20:41,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-16 23:20:41,793 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-16 23:20:41,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:42,128 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2023-02-16 23:20:42,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:42,202 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2023-02-16 23:20:42,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:42,257 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2023-02-16 23:20:42,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:42,320 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-02-16 23:20:42,320 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-16 23:20:42,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2112545112] [2023-02-16 23:20:42,321 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2112545112] provided 0 perfect and 1 imperfect interpolant sequences [2023-02-16 23:20:42,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1867117920] [2023-02-16 23:20:42,321 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-02-16 23:20:42,321 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-16 23:20:42,321 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-02-16 23:20:42,323 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) [2023-02-16 23:20:42,332 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-02-16 23:20:42,403 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-02-16 23:20:42,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-02-16 23:20:42,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 37 conjunts are in the unsatisfiable core [2023-02-16 23:20:42,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-02-16 23:20:42,607 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-02-16 23:20:42,608 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-02-16 23:20:42,732 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-02-16 23:20:42,733 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1867117920] provided 0 perfect and 2 imperfect interpolant sequences [2023-02-16 23:20:42,733 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-02-16 23:20:42,733 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 18 [2023-02-16 23:20:42,735 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1868247342] [2023-02-16 23:20:42,735 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-02-16 23:20:42,735 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-02-16 23:20:42,736 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-16 23:20:42,736 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-02-16 23:20:42,736 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=260, Unknown=0, NotChecked=0, Total=306 [2023-02-16 23:20:42,737 INFO L87 Difference]: Start difference. First operand 295 states and 381 transitions. Second operand has 18 states, 17 states have (on average 2.6470588235294117) internal successors, (45), 14 states have internal predecessors, (45), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-02-16 23:20:42,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-16 23:20:42,953 INFO L93 Difference]: Finished difference Result 527 states and 740 transitions. [2023-02-16 23:20:42,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-02-16 23:20:42,954 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.6470588235294117) internal successors, (45), 14 states have internal predecessors, (45), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 48 [2023-02-16 23:20:42,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-16 23:20:42,957 INFO L225 Difference]: With dead ends: 527 [2023-02-16 23:20:42,957 INFO L226 Difference]: Without dead ends: 523 [2023-02-16 23:20:42,958 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 74 SyntacticMatches, 27 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2023-02-16 23:20:42,958 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 25 mSDsluCounter, 598 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 656 SdHoareTripleChecker+Invalid, 237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-02-16 23:20:42,958 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 656 Invalid, 237 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 236 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-02-16 23:20:42,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 523 states. [2023-02-16 23:20:43,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 523 to 426. [2023-02-16 23:20:43,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 426 states, 370 states have (on average 1.3243243243243243) internal successors, (490), 393 states have internal predecessors, (490), 22 states have call successors, (22), 10 states have call predecessors, (22), 33 states have return successors, (74), 22 states have call predecessors, (74), 22 states have call successors, (74) [2023-02-16 23:20:43,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 426 states to 426 states and 586 transitions. [2023-02-16 23:20:43,044 INFO L78 Accepts]: Start accepts. Automaton has 426 states and 586 transitions. Word has length 48 [2023-02-16 23:20:43,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-16 23:20:43,045 INFO L495 AbstractCegarLoop]: Abstraction has 426 states and 586 transitions. [2023-02-16 23:20:43,045 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.6470588235294117) internal successors, (45), 14 states have internal predecessors, (45), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-02-16 23:20:43,045 INFO L276 IsEmpty]: Start isEmpty. Operand 426 states and 586 transitions. [2023-02-16 23:20:43,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-02-16 23:20:43,046 INFO L187 NwaCegarLoop]: Found error trace [2023-02-16 23:20:43,047 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-16 23:20:43,063 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-02-16 23:20:43,253 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-02-16 23:20:43,253 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-16 23:20:43,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-16 23:20:43,253 INFO L85 PathProgramCache]: Analyzing trace with hash -610179786, now seen corresponding path program 5 times [2023-02-16 23:20:43,253 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-16 23:20:43,253 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1184645947] [2023-02-16 23:20:43,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-16 23:20:43,254 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-16 23:20:43,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:43,620 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2023-02-16 23:20:43,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:43,627 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2023-02-16 23:20:43,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:43,726 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2023-02-16 23:20:43,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-16 23:20:43,870 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 40 proven. 31 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-02-16 23:20:43,871 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-16 23:20:43,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1184645947] [2023-02-16 23:20:43,871 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1184645947] provided 0 perfect and 1 imperfect interpolant sequences [2023-02-16 23:20:43,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [900709500] [2023-02-16 23:20:43,871 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2023-02-16 23:20:43,871 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-16 23:20:43,871 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-02-16 23:20:43,873 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) [2023-02-16 23:20:43,898 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-02-16 23:20:43,982 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2023-02-16 23:20:43,982 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-02-16 23:20:43,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 46 conjunts are in the unsatisfiable core [2023-02-16 23:20:43,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-02-16 23:20:44,062 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 17 [2023-02-16 23:20:44,199 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-02-16 23:20:44,199 INFO L350 Elim1Store]: Elim1 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 2 case distinctions, treesize of input 65 treesize of output 105 [2023-02-16 23:20:44,328 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-02-16 23:20:44,329 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 55 case distinctions, treesize of input 324 treesize of output 1428