./Ultimate.py --spec ../sv-benchmarks/c/properties/valid-memsafety.prp --file ../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 574ddb4e 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/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-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 valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 8f9453cad2383b5119b308e041fed5f4a740e7abd43cb8ad7833872af20a8d57 --- Real Ultimate output --- This is Ultimate 0.2.2-?-574ddb4 [2023-02-18 21:26:35,261 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-02-18 21:26:35,263 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-02-18 21:26:35,308 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-02-18 21:26:35,309 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-02-18 21:26:35,311 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-02-18 21:26:35,313 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-02-18 21:26:35,322 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-02-18 21:26:35,324 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-02-18 21:26:35,328 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-02-18 21:26:35,329 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-02-18 21:26:35,331 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-02-18 21:26:35,331 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-02-18 21:26:35,333 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-02-18 21:26:35,335 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-02-18 21:26:35,336 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-02-18 21:26:35,336 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-02-18 21:26:35,337 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-02-18 21:26:35,339 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-02-18 21:26:35,343 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-02-18 21:26:35,344 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-02-18 21:26:35,345 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-02-18 21:26:35,346 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-02-18 21:26:35,347 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-02-18 21:26:35,354 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-02-18 21:26:35,354 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-02-18 21:26:35,355 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-02-18 21:26:35,356 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-02-18 21:26:35,356 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-02-18 21:26:35,357 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-02-18 21:26:35,357 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-02-18 21:26:35,358 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-02-18 21:26:35,360 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-02-18 21:26:35,360 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-02-18 21:26:35,361 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-02-18 21:26:35,361 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-02-18 21:26:35,362 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-02-18 21:26:35,362 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-02-18 21:26:35,362 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-02-18 21:26:35,363 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-02-18 21:26:35,364 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-02-18 21:26:35,364 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2023-02-18 21:26:35,380 INFO L113 SettingsManager]: Loading preferences was successful [2023-02-18 21:26:35,380 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-02-18 21:26:35,381 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-02-18 21:26:35,381 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-02-18 21:26:35,382 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-02-18 21:26:35,382 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-02-18 21:26:35,382 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-02-18 21:26:35,382 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2023-02-18 21:26:35,383 INFO L138 SettingsManager]: * Use SBE=true [2023-02-18 21:26:35,383 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-02-18 21:26:35,383 INFO L138 SettingsManager]: * sizeof long=4 [2023-02-18 21:26:35,383 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2023-02-18 21:26:35,384 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-02-18 21:26:35,384 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-02-18 21:26:35,384 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-02-18 21:26:35,384 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-02-18 21:26:35,384 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2023-02-18 21:26:35,384 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-02-18 21:26:35,385 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-02-18 21:26:35,385 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-02-18 21:26:35,385 INFO L138 SettingsManager]: * sizeof long double=12 [2023-02-18 21:26:35,385 INFO L138 SettingsManager]: * Use constant arrays=true [2023-02-18 21:26:35,386 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-02-18 21:26:35,386 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-02-18 21:26:35,386 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-02-18 21:26:35,386 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-02-18 21:26:35,386 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-02-18 21:26:35,386 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-02-18 21:26:35,387 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2023-02-18 21:26:35,387 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-02-18 21:26:35,387 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-02-18 21:26:35,387 INFO L138 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-02-18 21:26:35,387 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-02-18 21:26:35,387 INFO L138 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC [2023-02-18 21:26:35,388 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8f9453cad2383b5119b308e041fed5f4a740e7abd43cb8ad7833872af20a8d57 [2023-02-18 21:26:35,658 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-02-18 21:26:35,677 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-02-18 21:26:35,679 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-02-18 21:26:35,680 INFO L271 PluginConnector]: Initializing CDTParser... [2023-02-18 21:26:35,680 INFO L275 PluginConnector]: CDTParser initialized [2023-02-18 21:26:35,681 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i [2023-02-18 21:26:36,752 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-02-18 21:26:37,012 INFO L351 CDTParser]: Found 1 translation units. [2023-02-18 21:26:37,017 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i [2023-02-18 21:26:37,031 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/209902356/b3e60685273c4874b9611c0783c3e116/FLAG4071283e9 [2023-02-18 21:26:37,042 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/209902356/b3e60685273c4874b9611c0783c3e116 [2023-02-18 21:26:37,044 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-02-18 21:26:37,045 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2023-02-18 21:26:37,049 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-02-18 21:26:37,050 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-02-18 21:26:37,053 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-02-18 21:26:37,053 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.02 09:26:37" (1/1) ... [2023-02-18 21:26:37,054 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3add807c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.02 09:26:37, skipping insertion in model container [2023-02-18 21:26:37,055 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.02 09:26:37" (1/1) ... [2023-02-18 21:26:37,060 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-02-18 21:26:37,086 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-02-18 21:26:37,333 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/heap-manipulation/sll_to_dll_rev-2.i[22636,22649] [2023-02-18 21:26:37,375 INFO L210 PostProcessor]: Analyzing one entry point: main [2023-02-18 21:26:37,385 INFO L203 MainTranslator]: Completed pre-run [2023-02-18 21:26:37,409 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/heap-manipulation/sll_to_dll_rev-2.i[22636,22649] [2023-02-18 21:26:37,420 INFO L210 PostProcessor]: Analyzing one entry point: main [2023-02-18 21:26:37,446 INFO L208 MainTranslator]: Completed translation [2023-02-18 21:26:37,446 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.02 09:26:37 WrapperNode [2023-02-18 21:26:37,446 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-02-18 21:26:37,447 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-02-18 21:26:37,447 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-02-18 21:26:37,447 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2023-02-18 21:26:37,453 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.02 09:26:37" (1/1) ... [2023-02-18 21:26:37,465 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.02 09:26:37" (1/1) ... [2023-02-18 21:26:37,487 INFO L138 Inliner]: procedures = 129, calls = 79, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 203 [2023-02-18 21:26:37,491 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-02-18 21:26:37,491 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-02-18 21:26:37,492 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-02-18 21:26:37,492 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-02-18 21:26:37,500 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.02 09:26:37" (1/1) ... [2023-02-18 21:26:37,500 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.02 09:26:37" (1/1) ... [2023-02-18 21:26:37,505 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.02 09:26:37" (1/1) ... [2023-02-18 21:26:37,505 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.02 09:26:37" (1/1) ... [2023-02-18 21:26:37,514 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.02 09:26:37" (1/1) ... [2023-02-18 21:26:37,521 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.02 09:26:37" (1/1) ... [2023-02-18 21:26:37,524 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.02 09:26:37" (1/1) ... [2023-02-18 21:26:37,526 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.02 09:26:37" (1/1) ... [2023-02-18 21:26:37,529 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-02-18 21:26:37,530 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-02-18 21:26:37,530 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-02-18 21:26:37,530 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-02-18 21:26:37,531 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.02 09:26:37" (1/1) ... [2023-02-18 21:26:37,536 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-02-18 21:26:37,546 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-02-18 21:26:37,558 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) [2023-02-18 21:26:37,562 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 [2023-02-18 21:26:37,592 INFO L130 BoogieDeclarations]: Found specification of procedure fail [2023-02-18 21:26:37,592 INFO L138 BoogieDeclarations]: Found implementation of procedure fail [2023-02-18 21:26:37,593 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-02-18 21:26:37,593 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-02-18 21:26:37,593 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-02-18 21:26:37,593 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-02-18 21:26:37,593 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-02-18 21:26:37,594 INFO L130 BoogieDeclarations]: Found specification of procedure check_seq_prev [2023-02-18 21:26:37,594 INFO L138 BoogieDeclarations]: Found implementation of procedure check_seq_prev [2023-02-18 21:26:37,594 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-02-18 21:26:37,594 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-02-18 21:26:37,594 INFO L130 BoogieDeclarations]: Found specification of procedure chain_node [2023-02-18 21:26:37,594 INFO L138 BoogieDeclarations]: Found implementation of procedure chain_node [2023-02-18 21:26:37,594 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-02-18 21:26:37,595 INFO L130 BoogieDeclarations]: Found specification of procedure check_seq_next [2023-02-18 21:26:37,595 INFO L138 BoogieDeclarations]: Found implementation of procedure check_seq_next [2023-02-18 21:26:37,595 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-02-18 21:26:37,595 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-02-18 21:26:37,745 INFO L235 CfgBuilder]: Building ICFG [2023-02-18 21:26:37,747 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2023-02-18 21:26:38,210 INFO L276 CfgBuilder]: Performing block encoding [2023-02-18 21:26:38,217 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-02-18 21:26:38,217 INFO L300 CfgBuilder]: Removed 33 assume(true) statements. [2023-02-18 21:26:38,219 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.02 09:26:38 BoogieIcfgContainer [2023-02-18 21:26:38,219 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-02-18 21:26:38,221 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-02-18 21:26:38,221 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-02-18 21:26:38,224 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-02-18 21:26:38,224 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.02 09:26:37" (1/3) ... [2023-02-18 21:26:38,225 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3021d5a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.02 09:26:38, skipping insertion in model container [2023-02-18 21:26:38,225 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.02 09:26:37" (2/3) ... [2023-02-18 21:26:38,226 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3021d5a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.02 09:26:38, skipping insertion in model container [2023-02-18 21:26:38,226 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.02 09:26:38" (3/3) ... [2023-02-18 21:26:38,227 INFO L112 eAbstractionObserver]: Analyzing ICFG sll_to_dll_rev-2.i [2023-02-18 21:26:38,241 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-02-18 21:26:38,241 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 83 error locations. [2023-02-18 21:26:38,295 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-02-18 21:26:38,299 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=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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;@43f82953, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-02-18 21:26:38,300 INFO L358 AbstractCegarLoop]: Starting to check reachability of 83 error locations. [2023-02-18 21:26:38,304 INFO L276 IsEmpty]: Start isEmpty. Operand has 223 states, 121 states have (on average 2.090909090909091) internal successors, (253), 209 states have internal predecessors, (253), 17 states have call successors, (17), 4 states have call predecessors, (17), 4 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2023-02-18 21:26:38,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-02-18 21:26:38,309 INFO L187 NwaCegarLoop]: Found error trace [2023-02-18 21:26:38,309 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-02-18 21:26:38,310 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-02-18 21:26:38,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-18 21:26:38,314 INFO L85 PathProgramCache]: Analyzing trace with hash 6220774, now seen corresponding path program 1 times [2023-02-18 21:26:38,320 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-18 21:26:38,320 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1020361397] [2023-02-18 21:26:38,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-18 21:26:38,321 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-18 21:26:38,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-18 21:26:38,491 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-18 21:26:38,492 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-18 21:26:38,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1020361397] [2023-02-18 21:26:38,493 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1020361397] provided 1 perfect and 0 imperfect interpolant sequences [2023-02-18 21:26:38,493 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-02-18 21:26:38,493 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-02-18 21:26:38,495 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1925083303] [2023-02-18 21:26:38,495 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-02-18 21:26:38,499 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-02-18 21:26:38,499 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-18 21:26:38,522 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-02-18 21:26:38,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-02-18 21:26:38,525 INFO L87 Difference]: Start difference. First operand has 223 states, 121 states have (on average 2.090909090909091) internal successors, (253), 209 states have internal predecessors, (253), 17 states have call successors, (17), 4 states have call predecessors, (17), 4 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) Second operand has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-18 21:26:38,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-18 21:26:38,554 INFO L93 Difference]: Finished difference Result 221 states and 242 transitions. [2023-02-18 21:26:38,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-02-18 21:26:38,557 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-02-18 21:26:38,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-18 21:26:38,564 INFO L225 Difference]: With dead ends: 221 [2023-02-18 21:26:38,564 INFO L226 Difference]: Without dead ends: 219 [2023-02-18 21:26:38,566 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-02-18 21:26:38,569 INFO L413 NwaCegarLoop]: 242 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, 242 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 [2023-02-18 21:26:38,570 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 242 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-02-18 21:26:38,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2023-02-18 21:26:38,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 219. [2023-02-18 21:26:38,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 116 states have (on average 1.8448275862068966) internal successors, (214), 205 states have internal predecessors, (214), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-02-18 21:26:38,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 240 transitions. [2023-02-18 21:26:38,614 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 240 transitions. Word has length 4 [2023-02-18 21:26:38,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-18 21:26:38,615 INFO L495 AbstractCegarLoop]: Abstraction has 219 states and 240 transitions. [2023-02-18 21:26:38,615 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-18 21:26:38,615 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 240 transitions. [2023-02-18 21:26:38,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-02-18 21:26:38,616 INFO L187 NwaCegarLoop]: Found error trace [2023-02-18 21:26:38,616 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-02-18 21:26:38,616 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-02-18 21:26:38,616 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting chain_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-02-18 21:26:38,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-18 21:26:38,617 INFO L85 PathProgramCache]: Analyzing trace with hash 1692154958, now seen corresponding path program 1 times [2023-02-18 21:26:38,617 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-18 21:26:38,618 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1000143167] [2023-02-18 21:26:38,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-18 21:26:38,618 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-18 21:26:38,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-18 21:26:38,709 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-18 21:26:38,709 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-18 21:26:38,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1000143167] [2023-02-18 21:26:38,710 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1000143167] provided 1 perfect and 0 imperfect interpolant sequences [2023-02-18 21:26:38,710 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-02-18 21:26:38,710 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-02-18 21:26:38,710 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797327184] [2023-02-18 21:26:38,711 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-02-18 21:26:38,712 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-02-18 21:26:38,712 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-18 21:26:38,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-02-18 21:26:38,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-02-18 21:26:38,713 INFO L87 Difference]: Start difference. First operand 219 states and 240 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-18 21:26:38,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-18 21:26:38,880 INFO L93 Difference]: Finished difference Result 217 states and 238 transitions. [2023-02-18 21:26:38,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-02-18 21:26:38,880 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-02-18 21:26:38,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-18 21:26:38,882 INFO L225 Difference]: With dead ends: 217 [2023-02-18 21:26:38,882 INFO L226 Difference]: Without dead ends: 217 [2023-02-18 21:26:38,883 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-02-18 21:26:38,884 INFO L413 NwaCegarLoop]: 226 mSDtfsCounter, 17 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 367 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-02-18 21:26:38,885 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 367 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-02-18 21:26:38,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2023-02-18 21:26:38,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 217. [2023-02-18 21:26:38,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 116 states have (on average 1.8275862068965518) internal successors, (212), 203 states have internal predecessors, (212), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-02-18 21:26:38,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 238 transitions. [2023-02-18 21:26:38,905 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 238 transitions. Word has length 6 [2023-02-18 21:26:38,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-18 21:26:38,906 INFO L495 AbstractCegarLoop]: Abstraction has 217 states and 238 transitions. [2023-02-18 21:26:38,906 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-18 21:26:38,906 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 238 transitions. [2023-02-18 21:26:38,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-02-18 21:26:38,906 INFO L187 NwaCegarLoop]: Found error trace [2023-02-18 21:26:38,907 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-02-18 21:26:38,907 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-02-18 21:26:38,907 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting chain_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-02-18 21:26:38,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-18 21:26:38,908 INFO L85 PathProgramCache]: Analyzing trace with hash 1692154959, now seen corresponding path program 1 times [2023-02-18 21:26:38,908 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-18 21:26:38,908 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [371496682] [2023-02-18 21:26:38,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-18 21:26:38,908 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-18 21:26:38,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-18 21:26:39,045 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-18 21:26:39,045 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-18 21:26:39,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [371496682] [2023-02-18 21:26:39,046 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [371496682] provided 1 perfect and 0 imperfect interpolant sequences [2023-02-18 21:26:39,047 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-02-18 21:26:39,047 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-02-18 21:26:39,048 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922596392] [2023-02-18 21:26:39,048 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-02-18 21:26:39,048 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-02-18 21:26:39,049 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-18 21:26:39,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-02-18 21:26:39,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-02-18 21:26:39,052 INFO L87 Difference]: Start difference. First operand 217 states and 238 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-18 21:26:39,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-18 21:26:39,184 INFO L93 Difference]: Finished difference Result 215 states and 236 transitions. [2023-02-18 21:26:39,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-02-18 21:26:39,185 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-02-18 21:26:39,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-18 21:26:39,187 INFO L225 Difference]: With dead ends: 215 [2023-02-18 21:26:39,188 INFO L226 Difference]: Without dead ends: 215 [2023-02-18 21:26:39,191 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-02-18 21:26:39,194 INFO L413 NwaCegarLoop]: 226 mSDtfsCounter, 15 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 372 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-02-18 21:26:39,195 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 372 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-02-18 21:26:39,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2023-02-18 21:26:39,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 215. [2023-02-18 21:26:39,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 116 states have (on average 1.8103448275862069) internal successors, (210), 201 states have internal predecessors, (210), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-02-18 21:26:39,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 236 transitions. [2023-02-18 21:26:39,223 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 236 transitions. Word has length 6 [2023-02-18 21:26:39,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-18 21:26:39,224 INFO L495 AbstractCegarLoop]: Abstraction has 215 states and 236 transitions. [2023-02-18 21:26:39,224 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-18 21:26:39,224 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 236 transitions. [2023-02-18 21:26:39,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-02-18 21:26:39,225 INFO L187 NwaCegarLoop]: Found error trace [2023-02-18 21:26:39,225 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-18 21:26:39,225 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-02-18 21:26:39,225 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting chain_nodeErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-02-18 21:26:39,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-18 21:26:39,226 INFO L85 PathProgramCache]: Analyzing trace with hash -387700622, now seen corresponding path program 1 times [2023-02-18 21:26:39,226 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-18 21:26:39,226 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1830321998] [2023-02-18 21:26:39,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-18 21:26:39,227 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-18 21:26:39,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-18 21:26:39,429 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-18 21:26:39,431 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-18 21:26:39,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1830321998] [2023-02-18 21:26:39,432 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1830321998] provided 1 perfect and 0 imperfect interpolant sequences [2023-02-18 21:26:39,432 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-02-18 21:26:39,432 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-02-18 21:26:39,432 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1378019829] [2023-02-18 21:26:39,433 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-02-18 21:26:39,433 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-02-18 21:26:39,433 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-18 21:26:39,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-02-18 21:26:39,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-02-18 21:26:39,435 INFO L87 Difference]: Start difference. First operand 215 states and 236 transitions. Second operand has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-18 21:26:39,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-18 21:26:39,641 INFO L93 Difference]: Finished difference Result 210 states and 231 transitions. [2023-02-18 21:26:39,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-02-18 21:26:39,642 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-02-18 21:26:39,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-18 21:26:39,644 INFO L225 Difference]: With dead ends: 210 [2023-02-18 21:26:39,644 INFO L226 Difference]: Without dead ends: 210 [2023-02-18 21:26:39,644 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-02-18 21:26:39,653 INFO L413 NwaCegarLoop]: 206 mSDtfsCounter, 56 mSDsluCounter, 396 mSDsCounter, 0 mSdLazyCounter, 262 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 602 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 262 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-02-18 21:26:39,655 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 602 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 262 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-02-18 21:26:39,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2023-02-18 21:26:39,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 210. [2023-02-18 21:26:39,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 116 states have (on average 1.7672413793103448) internal successors, (205), 196 states have internal predecessors, (205), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-02-18 21:26:39,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 231 transitions. [2023-02-18 21:26:39,675 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 231 transitions. Word has length 10 [2023-02-18 21:26:39,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-18 21:26:39,676 INFO L495 AbstractCegarLoop]: Abstraction has 210 states and 231 transitions. [2023-02-18 21:26:39,676 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-18 21:26:39,676 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 231 transitions. [2023-02-18 21:26:39,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-02-18 21:26:39,677 INFO L187 NwaCegarLoop]: Found error trace [2023-02-18 21:26:39,677 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-18 21:26:39,678 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-02-18 21:26:39,678 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting chain_nodeErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-02-18 21:26:39,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-18 21:26:39,679 INFO L85 PathProgramCache]: Analyzing trace with hash -387700621, now seen corresponding path program 1 times [2023-02-18 21:26:39,680 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-18 21:26:39,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2083785223] [2023-02-18 21:26:39,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-18 21:26:39,681 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-18 21:26:39,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-18 21:26:39,878 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-18 21:26:39,879 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-18 21:26:39,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2083785223] [2023-02-18 21:26:39,879 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2083785223] provided 1 perfect and 0 imperfect interpolant sequences [2023-02-18 21:26:39,879 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-02-18 21:26:39,880 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-02-18 21:26:39,880 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228880726] [2023-02-18 21:26:39,880 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-02-18 21:26:39,881 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-02-18 21:26:39,881 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-18 21:26:39,881 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-02-18 21:26:39,881 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-02-18 21:26:39,882 INFO L87 Difference]: Start difference. First operand 210 states and 231 transitions. Second operand has 5 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-18 21:26:40,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-18 21:26:40,124 INFO L93 Difference]: Finished difference Result 205 states and 226 transitions. [2023-02-18 21:26:40,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-02-18 21:26:40,127 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-02-18 21:26:40,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-18 21:26:40,129 INFO L225 Difference]: With dead ends: 205 [2023-02-18 21:26:40,129 INFO L226 Difference]: Without dead ends: 205 [2023-02-18 21:26:40,129 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-02-18 21:26:40,130 INFO L413 NwaCegarLoop]: 205 mSDtfsCounter, 39 mSDsluCounter, 339 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 544 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-02-18 21:26:40,130 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 544 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 307 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-02-18 21:26:40,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2023-02-18 21:26:40,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2023-02-18 21:26:40,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 116 states have (on average 1.7241379310344827) internal successors, (200), 191 states have internal predecessors, (200), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-02-18 21:26:40,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 226 transitions. [2023-02-18 21:26:40,139 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 226 transitions. Word has length 10 [2023-02-18 21:26:40,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-18 21:26:40,139 INFO L495 AbstractCegarLoop]: Abstraction has 205 states and 226 transitions. [2023-02-18 21:26:40,140 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-18 21:26:40,140 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 226 transitions. [2023-02-18 21:26:40,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-02-18 21:26:40,140 INFO L187 NwaCegarLoop]: Found error trace [2023-02-18 21:26:40,140 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-18 21:26:40,141 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-02-18 21:26:40,145 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting chain_nodeErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-02-18 21:26:40,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-18 21:26:40,145 INFO L85 PathProgramCache]: Analyzing trace with hash 866182740, now seen corresponding path program 1 times [2023-02-18 21:26:40,145 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-18 21:26:40,146 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [247486474] [2023-02-18 21:26:40,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-18 21:26:40,146 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-18 21:26:40,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-18 21:26:40,197 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-18 21:26:40,197 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-18 21:26:40,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [247486474] [2023-02-18 21:26:40,197 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [247486474] provided 1 perfect and 0 imperfect interpolant sequences [2023-02-18 21:26:40,197 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-02-18 21:26:40,198 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-02-18 21:26:40,198 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091709751] [2023-02-18 21:26:40,198 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-02-18 21:26:40,198 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-02-18 21:26:40,199 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-18 21:26:40,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-02-18 21:26:40,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-02-18 21:26:40,200 INFO L87 Difference]: Start difference. First operand 205 states and 226 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-18 21:26:40,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-18 21:26:40,367 INFO L93 Difference]: Finished difference Result 204 states and 225 transitions. [2023-02-18 21:26:40,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-02-18 21:26:40,368 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-02-18 21:26:40,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-18 21:26:40,369 INFO L225 Difference]: With dead ends: 204 [2023-02-18 21:26:40,369 INFO L226 Difference]: Without dead ends: 204 [2023-02-18 21:26:40,369 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-02-18 21:26:40,370 INFO L413 NwaCegarLoop]: 216 mSDtfsCounter, 21 mSDsluCounter, 414 mSDsCounter, 0 mSdLazyCounter, 243 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 630 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 243 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-02-18 21:26:40,370 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 630 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 243 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-02-18 21:26:40,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2023-02-18 21:26:40,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 204. [2023-02-18 21:26:40,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 116 states have (on average 1.7155172413793103) internal successors, (199), 190 states have internal predecessors, (199), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-02-18 21:26:40,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 225 transitions. [2023-02-18 21:26:40,376 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 225 transitions. Word has length 11 [2023-02-18 21:26:40,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-18 21:26:40,376 INFO L495 AbstractCegarLoop]: Abstraction has 204 states and 225 transitions. [2023-02-18 21:26:40,377 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-18 21:26:40,377 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 225 transitions. [2023-02-18 21:26:40,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-02-18 21:26:40,377 INFO L187 NwaCegarLoop]: Found error trace [2023-02-18 21:26:40,377 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-18 21:26:40,377 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-02-18 21:26:40,378 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting chain_nodeErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-02-18 21:26:40,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-18 21:26:40,378 INFO L85 PathProgramCache]: Analyzing trace with hash 866182741, now seen corresponding path program 1 times [2023-02-18 21:26:40,378 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-18 21:26:40,379 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [944565873] [2023-02-18 21:26:40,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-18 21:26:40,379 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-18 21:26:40,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-18 21:26:40,459 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-18 21:26:40,459 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-18 21:26:40,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [944565873] [2023-02-18 21:26:40,460 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [944565873] provided 1 perfect and 0 imperfect interpolant sequences [2023-02-18 21:26:40,460 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-02-18 21:26:40,460 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-02-18 21:26:40,460 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494581415] [2023-02-18 21:26:40,461 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-02-18 21:26:40,461 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-02-18 21:26:40,461 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-18 21:26:40,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-02-18 21:26:40,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-02-18 21:26:40,462 INFO L87 Difference]: Start difference. First operand 204 states and 225 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-18 21:26:40,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-18 21:26:40,610 INFO L93 Difference]: Finished difference Result 203 states and 224 transitions. [2023-02-18 21:26:40,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-02-18 21:26:40,611 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-02-18 21:26:40,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-18 21:26:40,612 INFO L225 Difference]: With dead ends: 203 [2023-02-18 21:26:40,612 INFO L226 Difference]: Without dead ends: 203 [2023-02-18 21:26:40,612 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-02-18 21:26:40,613 INFO L413 NwaCegarLoop]: 216 mSDtfsCounter, 17 mSDsluCounter, 429 mSDsCounter, 0 mSdLazyCounter, 227 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 645 SdHoareTripleChecker+Invalid, 227 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-02-18 21:26:40,613 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 645 Invalid, 227 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 227 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-02-18 21:26:40,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2023-02-18 21:26:40,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 203. [2023-02-18 21:26:40,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 116 states have (on average 1.706896551724138) internal successors, (198), 189 states have internal predecessors, (198), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-02-18 21:26:40,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 224 transitions. [2023-02-18 21:26:40,618 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 224 transitions. Word has length 11 [2023-02-18 21:26:40,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-18 21:26:40,618 INFO L495 AbstractCegarLoop]: Abstraction has 203 states and 224 transitions. [2023-02-18 21:26:40,618 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-02-18 21:26:40,618 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 224 transitions. [2023-02-18 21:26:40,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-02-18 21:26:40,619 INFO L187 NwaCegarLoop]: Found error trace [2023-02-18 21:26:40,619 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-18 21:26:40,619 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-02-18 21:26:40,620 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-02-18 21:26:40,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-18 21:26:40,620 INFO L85 PathProgramCache]: Analyzing trace with hash -610249734, now seen corresponding path program 1 times [2023-02-18 21:26:40,620 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-18 21:26:40,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2082765091] [2023-02-18 21:26:40,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-18 21:26:40,621 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-18 21:26:40,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-18 21:26:40,830 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-02-18 21:26:40,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-18 21:26:40,940 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-18 21:26:40,941 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-18 21:26:40,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2082765091] [2023-02-18 21:26:40,941 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2082765091] provided 1 perfect and 0 imperfect interpolant sequences [2023-02-18 21:26:40,941 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-02-18 21:26:40,941 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-02-18 21:26:40,941 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1301830727] [2023-02-18 21:26:40,942 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-02-18 21:26:40,943 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-02-18 21:26:40,944 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-18 21:26:40,945 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-02-18 21:26:40,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2023-02-18 21:26:40,945 INFO L87 Difference]: Start difference. First operand 203 states and 224 transitions. Second operand has 9 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 8 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-02-18 21:26:41,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-18 21:26:41,412 INFO L93 Difference]: Finished difference Result 202 states and 223 transitions. [2023-02-18 21:26:41,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-02-18 21:26:41,412 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 8 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2023-02-18 21:26:41,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-18 21:26:41,414 INFO L225 Difference]: With dead ends: 202 [2023-02-18 21:26:41,415 INFO L226 Difference]: Without dead ends: 202 [2023-02-18 21:26:41,416 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2023-02-18 21:26:41,417 INFO L413 NwaCegarLoop]: 155 mSDtfsCounter, 76 mSDsluCounter, 371 mSDsCounter, 0 mSdLazyCounter, 690 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 526 SdHoareTripleChecker+Invalid, 704 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 690 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-02-18 21:26:41,417 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 526 Invalid, 704 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 690 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-02-18 21:26:41,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2023-02-18 21:26:41,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 202. [2023-02-18 21:26:41,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 116 states have (on average 1.6982758620689655) internal successors, (197), 188 states have internal predecessors, (197), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-02-18 21:26:41,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 223 transitions. [2023-02-18 21:26:41,423 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 223 transitions. Word has length 19 [2023-02-18 21:26:41,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-18 21:26:41,424 INFO L495 AbstractCegarLoop]: Abstraction has 202 states and 223 transitions. [2023-02-18 21:26:41,425 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 8 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-02-18 21:26:41,425 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 223 transitions. [2023-02-18 21:26:41,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-02-18 21:26:41,425 INFO L187 NwaCegarLoop]: Found error trace [2023-02-18 21:26:41,426 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-18 21:26:41,426 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-02-18 21:26:41,426 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-02-18 21:26:41,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-18 21:26:41,427 INFO L85 PathProgramCache]: Analyzing trace with hash -610249733, now seen corresponding path program 1 times [2023-02-18 21:26:41,427 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-18 21:26:41,427 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1147579154] [2023-02-18 21:26:41,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-18 21:26:41,427 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-18 21:26:41,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-18 21:26:41,664 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-02-18 21:26:41,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-18 21:26:41,727 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-02-18 21:26:41,728 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-18 21:26:41,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1147579154] [2023-02-18 21:26:41,728 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1147579154] provided 1 perfect and 0 imperfect interpolant sequences [2023-02-18 21:26:41,728 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-02-18 21:26:41,728 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-02-18 21:26:41,728 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153651681] [2023-02-18 21:26:41,728 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-02-18 21:26:41,729 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-02-18 21:26:41,729 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-02-18 21:26:41,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-02-18 21:26:41,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2023-02-18 21:26:41,730 INFO L87 Difference]: Start difference. First operand 202 states and 223 transitions. Second operand has 7 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-02-18 21:26:42,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-02-18 21:26:42,009 INFO L93 Difference]: Finished difference Result 201 states and 222 transitions. [2023-02-18 21:26:42,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-02-18 21:26:42,009 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2023-02-18 21:26:42,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-02-18 21:26:42,010 INFO L225 Difference]: With dead ends: 201 [2023-02-18 21:26:42,010 INFO L226 Difference]: Without dead ends: 201 [2023-02-18 21:26:42,011 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2023-02-18 21:26:42,011 INFO L413 NwaCegarLoop]: 98 mSDtfsCounter, 376 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 330 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 382 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 330 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-02-18 21:26:42,011 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [382 Valid, 186 Invalid, 367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 330 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-02-18 21:26:42,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2023-02-18 21:26:42,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 201. [2023-02-18 21:26:42,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 116 states have (on average 1.6896551724137931) internal successors, (196), 187 states have internal predecessors, (196), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-02-18 21:26:42,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 222 transitions. [2023-02-18 21:26:42,016 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 222 transitions. Word has length 19 [2023-02-18 21:26:42,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-02-18 21:26:42,016 INFO L495 AbstractCegarLoop]: Abstraction has 201 states and 222 transitions. [2023-02-18 21:26:42,016 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-02-18 21:26:42,016 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 222 transitions. [2023-02-18 21:26:42,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-02-18 21:26:42,017 INFO L187 NwaCegarLoop]: Found error trace [2023-02-18 21:26:42,017 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-02-18 21:26:42,017 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-02-18 21:26:42,018 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-02-18 21:26:42,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2023-02-18 21:26:42,018 INFO L85 PathProgramCache]: Analyzing trace with hash 50383991, now seen corresponding path program 1 times [2023-02-18 21:26:42,018 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-02-18 21:26:42,018 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1916076351] [2023-02-18 21:26:42,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-18 21:26:42,019 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-02-18 21:26:42,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-18 21:26:42,337 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-02-18 21:26:42,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-18 21:26:42,406 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2023-02-18 21:26:42,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-18 21:26:42,513 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-02-18 21:26:42,513 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-02-18 21:26:42,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1916076351] [2023-02-18 21:26:42,513 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1916076351] provided 0 perfect and 1 imperfect interpolant sequences [2023-02-18 21:26:42,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2145179370] [2023-02-18 21:26:42,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-02-18 21:26:42,514 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-02-18 21:26:42,514 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-02-18 21:26:42,518 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) [2023-02-18 21:26:42,519 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-02-18 21:26:42,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-02-18 21:26:42,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 33 conjunts are in the unsatisfiable core [2023-02-18 21:26:42,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-02-18 21:26:42,728 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-02-18 21:26:42,729 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 22 treesize of output 67 [2023-02-18 21:26:42,909 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-02-18 21:26:42,910 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 266 treesize of output 926