./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/list-simple/sll2c_append_unequal.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/list-simple/sll2c_append_unequal.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 d83e632829c1e193271bd76b90e08187eb94c70000e5f11d7aea101b3ec9a9e6 --- Real Ultimate output --- This is Ultimate 0.2.2-?-26d01a9 [2023-02-17 23:20:12,064 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-02-17 23:20:12,066 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-02-17 23:20:12,088 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-02-17 23:20:12,089 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-02-17 23:20:12,090 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-02-17 23:20:12,091 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-02-17 23:20:12,092 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-02-17 23:20:12,093 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-02-17 23:20:12,094 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-02-17 23:20:12,095 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-02-17 23:20:12,096 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-02-17 23:20:12,096 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-02-17 23:20:12,097 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-02-17 23:20:12,098 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-02-17 23:20:12,099 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-02-17 23:20:12,099 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-02-17 23:20:12,100 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-02-17 23:20:12,101 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-02-17 23:20:12,102 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-02-17 23:20:12,103 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-02-17 23:20:12,104 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-02-17 23:20:12,105 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-02-17 23:20:12,106 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-02-17 23:20:12,108 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-02-17 23:20:12,112 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-02-17 23:20:12,112 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-02-17 23:20:12,113 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-02-17 23:20:12,113 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-02-17 23:20:12,114 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-02-17 23:20:12,116 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-02-17 23:20:12,116 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-02-17 23:20:12,117 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-02-17 23:20:12,118 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-02-17 23:20:12,119 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-02-17 23:20:12,119 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-02-17 23:20:12,120 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-02-17 23:20:12,121 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-02-17 23:20:12,121 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-02-17 23:20:12,122 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-02-17 23:20:12,123 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-02-17 23:20:12,125 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2023-02-17 23:20:12,148 INFO L113 SettingsManager]: Loading preferences was successful [2023-02-17 23:20:12,153 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-02-17 23:20:12,153 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-02-17 23:20:12,153 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-02-17 23:20:12,154 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-02-17 23:20:12,154 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-02-17 23:20:12,155 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-02-17 23:20:12,156 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2023-02-17 23:20:12,156 INFO L138 SettingsManager]: * Use SBE=true [2023-02-17 23:20:12,156 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-02-17 23:20:12,157 INFO L138 SettingsManager]: * sizeof long=4 [2023-02-17 23:20:12,157 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-02-17 23:20:12,157 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-02-17 23:20:12,157 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-02-17 23:20:12,157 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-02-17 23:20:12,158 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-02-17 23:20:12,158 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-02-17 23:20:12,158 INFO L138 SettingsManager]: * sizeof long double=12 [2023-02-17 23:20:12,158 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-02-17 23:20:12,158 INFO L138 SettingsManager]: * Use constant arrays=true [2023-02-17 23:20:12,158 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-02-17 23:20:12,159 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-02-17 23:20:12,159 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-02-17 23:20:12,159 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-02-17 23:20:12,159 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-02-17 23:20:12,159 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-02-17 23:20:12,159 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-02-17 23:20:12,160 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-02-17 23:20:12,160 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2023-02-17 23:20:12,160 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-02-17 23:20:12,160 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-02-17 23:20:12,160 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-02-17 23:20:12,161 INFO L138 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-02-17 23:20:12,161 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-02-17 23:20:12,161 INFO L138 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC [2023-02-17 23:20:12,161 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d83e632829c1e193271bd76b90e08187eb94c70000e5f11d7aea101b3ec9a9e6 [2023-02-17 23:20:12,381 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-02-17 23:20:12,400 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-02-17 23:20:12,402 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-02-17 23:20:12,403 INFO L271 PluginConnector]: Initializing CDTParser... [2023-02-17 23:20:12,403 INFO L275 PluginConnector]: CDTParser initialized [2023-02-17 23:20:12,404 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/list-simple/sll2c_append_unequal.i [2023-02-17 23:20:13,490 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-02-17 23:20:13,729 INFO L351 CDTParser]: Found 1 translation units. [2023-02-17 23:20:13,730 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-simple/sll2c_append_unequal.i [2023-02-17 23:20:13,742 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cbf2d1445/ad5c6a8f6bf34755a005d2c38981ae87/FLAGc0d3a45f7 [2023-02-17 23:20:13,754 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cbf2d1445/ad5c6a8f6bf34755a005d2c38981ae87 [2023-02-17 23:20:13,756 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-02-17 23:20:13,757 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2023-02-17 23:20:13,758 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-02-17 23:20:13,758 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-02-17 23:20:13,762 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-02-17 23:20:13,762 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.02 11:20:13" (1/1) ... [2023-02-17 23:20:13,763 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@44bc3903 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.02 11:20:13, skipping insertion in model container [2023-02-17 23:20:13,763 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.02 11:20:13" (1/1) ... [2023-02-17 23:20:13,769 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-02-17 23:20:13,802 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-02-17 23:20:14,008 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/list-simple/sll2c_append_unequal.i[24587,24600] [2023-02-17 23:20:14,011 INFO L210 PostProcessor]: Analyzing one entry point: main [2023-02-17 23:20:14,018 INFO L203 MainTranslator]: Completed pre-run [2023-02-17 23:20:14,082 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/list-simple/sll2c_append_unequal.i[24587,24600] [2023-02-17 23:20:14,083 INFO L210 PostProcessor]: Analyzing one entry point: main [2023-02-17 23:20:14,106 INFO L208 MainTranslator]: Completed translation [2023-02-17 23:20:14,106 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.02 11:20:14 WrapperNode [2023-02-17 23:20:14,106 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-02-17 23:20:14,108 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-02-17 23:20:14,108 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-02-17 23:20:14,108 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2023-02-17 23:20:14,114 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.02 11:20:14" (1/1) ... [2023-02-17 23:20:14,132 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.02 11:20:14" (1/1) ... [2023-02-17 23:20:14,151 INFO L138 Inliner]: procedures = 127, calls = 46, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 158 [2023-02-17 23:20:14,154 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-02-17 23:20:14,156 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-02-17 23:20:14,156 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-02-17 23:20:14,156 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-02-17 23:20:14,164 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.02 11:20:14" (1/1) ... [2023-02-17 23:20:14,165 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.02 11:20:14" (1/1) ... [2023-02-17 23:20:14,171 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.02 11:20:14" (1/1) ... [2023-02-17 23:20:14,171 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.02 11:20:14" (1/1) ... [2023-02-17 23:20:14,186 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.02 11:20:14" (1/1) ... [2023-02-17 23:20:14,189 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.02 11:20:14" (1/1) ... [2023-02-17 23:20:14,191 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.02 11:20:14" (1/1) ... [2023-02-17 23:20:14,192 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.02 11:20:14" (1/1) ... [2023-02-17 23:20:14,194 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-02-17 23:20:14,195 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-02-17 23:20:14,195 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-02-17 23:20:14,195 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-02-17 23:20:14,196 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.02 11:20:14" (1/1) ... [2023-02-17 23:20:14,212 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-02-17 23:20:14,223 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-02-17 23:20:14,238 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) [2023-02-17 23:20:14,260 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 [2023-02-17 23:20:14,274 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-02-17 23:20:14,275 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-02-17 23:20:14,275 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-02-17 23:20:14,276 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-02-17 23:20:14,276 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-02-17 23:20:14,277 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-02-17 23:20:14,277 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-02-17 23:20:14,278 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-02-17 23:20:14,278 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-02-17 23:20:14,278 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-02-17 23:20:14,278 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-02-17 23:20:14,278 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-02-17 23:20:14,278 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-02-17 23:20:14,278 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-02-17 23:20:14,377 INFO L235 CfgBuilder]: Building ICFG [2023-02-17 23:20:14,379 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2023-02-17 23:20:14,607 INFO L276 CfgBuilder]: Performing block encoding [2023-02-17 23:20:14,613 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-02-17 23:20:14,613 INFO L300 CfgBuilder]: Removed 5 assume(true) statements. [2023-02-17 23:20:14,615 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.02 11:20:14 BoogieIcfgContainer [2023-02-17 23:20:14,615 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-02-17 23:20:14,617 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-02-17 23:20:14,617 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-02-17 23:20:14,619 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-02-17 23:20:14,620 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.02 11:20:13" (1/3) ... [2023-02-17 23:20:14,620 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@542128a8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.02 11:20:14, skipping insertion in model container [2023-02-17 23:20:14,620 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.02 11:20:14" (2/3) ... [2023-02-17 23:20:14,621 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@542128a8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.02 11:20:14, skipping insertion in model container [2023-02-17 23:20:14,621 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.02 11:20:14" (3/3) ... [2023-02-17 23:20:14,622 INFO L112 eAbstractionObserver]: Analyzing ICFG sll2c_append_unequal.i [2023-02-17 23:20:14,638 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-02-17 23:20:14,639 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-02-17 23:20:14,689 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-02-17 23:20:14,694 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;@51ebb200, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-02-17 23:20:14,694 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-02-17 23:20:14,697 INFO L276 IsEmpty]: Start isEmpty. Operand has 39 states, 33 states have (on average 1.5151515151515151) internal successors, (50), 34 states have internal predecessors, (50), 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) [2023-02-17 23:20:14,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-02-17 23:20:14,703 INFO L187 NwaCegarLoop]: Found error trace [2023-02-17 23:20:14,703 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-17 23:20:14,704 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-17 23:20:14,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-17 23:20:14,707 INFO L85 PathProgramCache]: Analyzing trace with hash -2119803949, now seen corresponding path program 1 times [2023-02-17 23:20:14,713 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-17 23:20:14,713 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [267591825] [2023-02-17 23:20:14,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-17 23:20:14,714 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-17 23:20:14,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-17 23:20:15,007 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-02-17 23:20:15,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-17 23:20:15,042 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2023-02-17 23:20:15,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-17 23:20:15,080 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-02-17 23:20:15,086 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-17 23:20:15,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [267591825] [2023-02-17 23:20:15,087 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [267591825] provided 1 perfect and 0 imperfect interpolant sequences [2023-02-17 23:20:15,088 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-02-17 23:20:15,089 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-02-17 23:20:15,090 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1187653278] [2023-02-17 23:20:15,091 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-02-17 23:20:15,095 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-02-17 23:20:15,096 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-17 23:20:15,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-02-17 23:20:15,141 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-02-17 23:20:15,144 INFO L87 Difference]: Start difference. First operand has 39 states, 33 states have (on average 1.5151515151515151) internal successors, (50), 34 states have internal predecessors, (50), 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 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 2 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-02-17 23:20:15,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-17 23:20:15,242 INFO L93 Difference]: Finished difference Result 71 states and 101 transitions. [2023-02-17 23:20:15,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-02-17 23:20:15,245 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 2 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2023-02-17 23:20:15,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-17 23:20:15,256 INFO L225 Difference]: With dead ends: 71 [2023-02-17 23:20:15,256 INFO L226 Difference]: Without dead ends: 31 [2023-02-17 23:20:15,259 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-02-17 23:20:15,265 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 0 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-02-17 23:20:15,266 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 72 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-02-17 23:20:15,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-02-17 23:20:15,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2023-02-17 23:20:15,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 26 states have internal predecessors, (33), 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) [2023-02-17 23:20:15,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 39 transitions. [2023-02-17 23:20:15,300 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 39 transitions. Word has length 25 [2023-02-17 23:20:15,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-17 23:20:15,303 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 39 transitions. [2023-02-17 23:20:15,303 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 2 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-02-17 23:20:15,304 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 39 transitions. [2023-02-17 23:20:15,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-02-17 23:20:15,305 INFO L187 NwaCegarLoop]: Found error trace [2023-02-17 23:20:15,305 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-17 23:20:15,306 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-02-17 23:20:15,306 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-17 23:20:15,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-17 23:20:15,307 INFO L85 PathProgramCache]: Analyzing trace with hash -826043684, now seen corresponding path program 1 times [2023-02-17 23:20:15,307 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-17 23:20:15,307 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [848692396] [2023-02-17 23:20:15,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-17 23:20:15,308 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-17 23:20:15,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-17 23:20:15,506 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-02-17 23:20:15,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-17 23:20:15,531 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2023-02-17 23:20:15,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-17 23:20:15,554 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-02-17 23:20:15,558 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-17 23:20:15,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [848692396] [2023-02-17 23:20:15,559 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [848692396] provided 1 perfect and 0 imperfect interpolant sequences [2023-02-17 23:20:15,559 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-02-17 23:20:15,560 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-02-17 23:20:15,560 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333347668] [2023-02-17 23:20:15,560 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-02-17 23:20:15,562 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-02-17 23:20:15,562 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-17 23:20:15,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-02-17 23:20:15,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-02-17 23:20:15,564 INFO L87 Difference]: Start difference. First operand 31 states and 39 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-02-17 23:20:15,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-17 23:20:15,614 INFO L93 Difference]: Finished difference Result 58 states and 73 transitions. [2023-02-17 23:20:15,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-02-17 23:20:15,617 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 26 [2023-02-17 23:20:15,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-17 23:20:15,619 INFO L225 Difference]: With dead ends: 58 [2023-02-17 23:20:15,620 INFO L226 Difference]: Without dead ends: 34 [2023-02-17 23:20:15,620 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-02-17 23:20:15,622 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 1 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-02-17 23:20:15,624 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 86 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-02-17 23:20:15,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-02-17 23:20:15,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2023-02-17 23:20:15,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.2592592592592593) internal successors, (34), 27 states have internal predecessors, (34), 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) [2023-02-17 23:20:15,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2023-02-17 23:20:15,632 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 26 [2023-02-17 23:20:15,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-17 23:20:15,633 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2023-02-17 23:20:15,634 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-02-17 23:20:15,634 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2023-02-17 23:20:15,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-02-17 23:20:15,636 INFO L187 NwaCegarLoop]: Found error trace [2023-02-17 23:20:15,636 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, 1, 1, 1, 1, 1, 1] [2023-02-17 23:20:15,636 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-02-17 23:20:15,637 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-17 23:20:15,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-17 23:20:15,637 INFO L85 PathProgramCache]: Analyzing trace with hash -1959720012, now seen corresponding path program 1 times [2023-02-17 23:20:15,637 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-17 23:20:15,638 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [775655972] [2023-02-17 23:20:15,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-17 23:20:15,638 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-17 23:20:15,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-17 23:20:16,052 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-02-17 23:20:16,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-17 23:20:16,064 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2023-02-17 23:20:16,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-17 23:20:16,135 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2023-02-17 23:20:16,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-17 23:20:16,222 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-02-17 23:20:16,222 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-17 23:20:16,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [775655972] [2023-02-17 23:20:16,223 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [775655972] provided 0 perfect and 1 imperfect interpolant sequences [2023-02-17 23:20:16,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [832193630] [2023-02-17 23:20:16,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-17 23:20:16,225 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-17 23:20:16,225 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-02-17 23:20:16,229 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) [2023-02-17 23:20:16,248 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-02-17 23:20:16,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-17 23:20:16,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 38 conjunts are in the unsatisfiable core [2023-02-17 23:20:16,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-02-17 23:20:16,572 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 21 treesize of output 13 [2023-02-17 23:20:16,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-02-17 23:20:16,651 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 28 treesize of output 28 [2023-02-17 23:20:16,680 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 29 treesize of output 17 [2023-02-17 23:20:16,700 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-02-17 23:20:16,700 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-02-17 23:20:16,804 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [832193630] provided 0 perfect and 1 imperfect interpolant sequences [2023-02-17 23:20:16,805 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-02-17 23:20:16,805 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 23 [2023-02-17 23:20:16,805 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [142496842] [2023-02-17 23:20:16,805 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-02-17 23:20:16,806 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-02-17 23:20:16,806 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-17 23:20:16,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-02-17 23:20:16,807 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=515, Unknown=10, NotChecked=0, Total=600 [2023-02-17 23:20:16,808 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 23 states, 21 states have (on average 2.0) internal successors, (42), 17 states have internal predecessors, (42), 4 states have call successors, (6), 3 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2023-02-17 23:20:17,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-17 23:20:17,052 INFO L93 Difference]: Finished difference Result 45 states and 57 transitions. [2023-02-17 23:20:17,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-02-17 23:20:17,052 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 2.0) internal successors, (42), 17 states have internal predecessors, (42), 4 states have call successors, (6), 3 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) Word has length 34 [2023-02-17 23:20:17,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-17 23:20:17,053 INFO L225 Difference]: With dead ends: 45 [2023-02-17 23:20:17,053 INFO L226 Difference]: Without dead ends: 34 [2023-02-17 23:20:17,054 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 31 SyntacticMatches, 5 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=150, Invalid=832, Unknown=10, NotChecked=0, Total=992 [2023-02-17 23:20:17,055 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 102 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-02-17 23:20:17,055 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 191 Invalid, 200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 193 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-02-17 23:20:17,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-02-17 23:20:17,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2023-02-17 23:20:17,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.2222222222222223) internal successors, (33), 27 states have internal predecessors, (33), 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) [2023-02-17 23:20:17,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2023-02-17 23:20:17,061 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 34 [2023-02-17 23:20:17,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-17 23:20:17,062 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2023-02-17 23:20:17,062 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 2.0) internal successors, (42), 17 states have internal predecessors, (42), 4 states have call successors, (6), 3 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2023-02-17 23:20:17,062 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2023-02-17 23:20:17,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-02-17 23:20:17,063 INFO L187 NwaCegarLoop]: Found error trace [2023-02-17 23:20:17,063 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-17 23:20:17,075 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-02-17 23:20:17,270 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-17 23:20:17,271 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-02-17 23:20:17,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-17 23:20:17,271 INFO L85 PathProgramCache]: Analyzing trace with hash -158694653, now seen corresponding path program 1 times [2023-02-17 23:20:17,271 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-17 23:20:17,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1029720494] [2023-02-17 23:20:17,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-17 23:20:17,272 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-17 23:20:17,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-17 23:20:18,079 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-02-17 23:20:18,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-17 23:20:18,090 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2023-02-17 23:20:18,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-17 23:20:18,166 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2023-02-17 23:20:18,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-17 23:20:18,264 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-02-17 23:20:18,264 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-17 23:20:18,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1029720494] [2023-02-17 23:20:18,266 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1029720494] provided 0 perfect and 1 imperfect interpolant sequences [2023-02-17 23:20:18,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [196330357] [2023-02-17 23:20:18,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-17 23:20:18,269 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-17 23:20:18,269 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-02-17 23:20:18,270 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) [2023-02-17 23:20:18,273 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-02-17 23:20:18,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-17 23:20:18,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 104 conjunts are in the unsatisfiable core [2023-02-17 23:20:18,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-02-17 23:20:18,438 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-02-17 23:20:18,604 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-02-17 23:20:18,605 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 17 treesize of output 39 [2023-02-17 23:20:18,652 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-02-17 23:20:18,703 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-02-17 23:20:18,704 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 54 treesize of output 63 [2023-02-17 23:20:18,813 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-02-17 23:20:18,814 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 128 treesize of output 98 [2023-02-17 23:20:18,829 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 27 [2023-02-17 23:20:18,838 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 7 treesize of output 3 [2023-02-17 23:20:18,854 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 15 treesize of output 11 [2023-02-17 23:20:18,857 WARN L207 Elim1Store]: Array PQE input equivalent to false [2023-02-17 23:20:18,863 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 12 treesize of output 8 [2023-02-17 23:20:18,972 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-02-17 23:20:18,974 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-02-17 23:20:18,974 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 138 treesize of output 150 [2023-02-17 23:20:18,984 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-02-17 23:20:18,984 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 50 treesize of output 56 [2023-02-17 23:20:18,996 WARN L207 Elim1Store]: Array PQE input equivalent to false [2023-02-17 23:20:19,006 WARN L207 Elim1Store]: Array PQE input equivalent to false [2023-02-17 23:20:19,008 WARN L207 Elim1Store]: Array PQE input equivalent to false [2023-02-17 23:20:19,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-02-17 23:20:19,039 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2023-02-17 23:20:19,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-02-17 23:20:19,429 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-02-17 23:20:19,430 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 1 disjoint index pairs (out of 28 index pairs), introduced 13 new quantified variables, introduced 34 case distinctions, treesize of input 630 treesize of output 780 [2023-02-17 23:20:19,473 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-02-17 23:20:19,475 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-02-17 23:20:19,476 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 178 treesize of output 166 [2023-02-17 23:20:19,519 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-02-17 23:20:19,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-02-17 23:20:19,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-02-17 23:20:19,528 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-02-17 23:20:19,529 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-02-17 23:20:19,530 INFO L173 IndexEqualityManager]: detected equality via solver [2023-02-17 23:20:19,543 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-02-17 23:20:19,543 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 6 disjoint index pairs (out of 28 index pairs), introduced 7 new quantified variables, introduced 22 case distinctions, treesize of input 255 treesize of output 448