./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 eb692b52 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-?-eb692b5 [2022-07-20 06:02:56,163 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-20 06:02:56,165 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-20 06:02:56,208 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-20 06:02:56,208 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-20 06:02:56,210 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-20 06:02:56,212 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-20 06:02:56,215 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-20 06:02:56,217 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-20 06:02:56,221 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-20 06:02:56,222 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-20 06:02:56,225 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-20 06:02:56,225 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-20 06:02:56,227 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-20 06:02:56,228 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-20 06:02:56,231 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-20 06:02:56,232 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-20 06:02:56,234 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-20 06:02:56,235 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-20 06:02:56,240 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-20 06:02:56,242 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-20 06:02:56,243 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-20 06:02:56,244 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-20 06:02:56,245 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-20 06:02:56,246 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-20 06:02:56,253 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-20 06:02:56,253 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-20 06:02:56,254 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-20 06:02:56,255 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-20 06:02:56,255 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-20 06:02:56,256 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-20 06:02:56,257 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-20 06:02:56,259 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-20 06:02:56,259 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-20 06:02:56,260 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-20 06:02:56,261 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-20 06:02:56,261 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-20 06:02:56,261 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-20 06:02:56,262 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-20 06:02:56,262 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-20 06:02:56,263 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-20 06:02:56,264 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-20 06:02:56,266 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2022-07-20 06:02:56,294 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-20 06:02:56,294 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-20 06:02:56,294 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-20 06:02:56,295 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-20 06:02:56,295 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-07-20 06:02:56,296 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-07-20 06:02:56,296 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-20 06:02:56,296 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-20 06:02:56,297 INFO L138 SettingsManager]: * Use SBE=true [2022-07-20 06:02:56,297 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-20 06:02:56,298 INFO L138 SettingsManager]: * sizeof long=4 [2022-07-20 06:02:56,298 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-07-20 06:02:56,298 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-07-20 06:02:56,298 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-07-20 06:02:56,299 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-20 06:02:56,299 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-07-20 06:02:56,299 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-07-20 06:02:56,299 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-07-20 06:02:56,299 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-07-20 06:02:56,300 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-07-20 06:02:56,301 INFO L138 SettingsManager]: * sizeof long double=12 [2022-07-20 06:02:56,301 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-20 06:02:56,301 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-20 06:02:56,301 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-20 06:02:56,302 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-07-20 06:02:56,302 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-20 06:02:56,302 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-20 06:02:56,302 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-07-20 06:02:56,302 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-07-20 06:02:56,303 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-07-20 06:02:56,303 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8f9453cad2383b5119b308e041fed5f4a740e7abd43cb8ad7833872af20a8d57 [2022-07-20 06:02:56,514 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-20 06:02:56,540 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-20 06:02:56,542 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-20 06:02:56,544 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-20 06:02:56,545 INFO L275 PluginConnector]: CDTParser initialized [2022-07-20 06:02:56,547 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i [2022-07-20 06:02:56,601 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/89f27a848/1e0bda0189db4d4cb2c07b34cc2e4e74/FLAG37c65a08b [2022-07-20 06:02:57,176 INFO L306 CDTParser]: Found 1 translation units. [2022-07-20 06:02:57,177 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i [2022-07-20 06:02:57,195 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/89f27a848/1e0bda0189db4d4cb2c07b34cc2e4e74/FLAG37c65a08b [2022-07-20 06:02:57,583 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/89f27a848/1e0bda0189db4d4cb2c07b34cc2e4e74 [2022-07-20 06:02:57,585 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-20 06:02:57,586 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-20 06:02:57,592 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-20 06:02:57,592 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-20 06:02:57,595 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-20 06:02:57,596 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 06:02:57" (1/1) ... [2022-07-20 06:02:57,597 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@79253f70 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:02:57, skipping insertion in model container [2022-07-20 06:02:57,597 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 06:02:57" (1/1) ... [2022-07-20 06:02:57,604 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-20 06:02:57,649 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-20 06:02:57,950 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i[22636,22649] [2022-07-20 06:02:57,998 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-20 06:02:58,009 INFO L203 MainTranslator]: Completed pre-run [2022-07-20 06:02:58,044 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i[22636,22649] [2022-07-20 06:02:58,069 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-20 06:02:58,097 INFO L208 MainTranslator]: Completed translation [2022-07-20 06:02:58,098 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:02:58 WrapperNode [2022-07-20 06:02:58,098 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-20 06:02:58,099 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-07-20 06:02:58,099 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-07-20 06:02:58,099 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-07-20 06:02:58,106 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:02:58" (1/1) ... [2022-07-20 06:02:58,119 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:02:58" (1/1) ... [2022-07-20 06:02:58,144 INFO L137 Inliner]: procedures = 129, calls = 79, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 203 [2022-07-20 06:02:58,145 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-07-20 06:02:58,146 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-07-20 06:02:58,146 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-07-20 06:02:58,146 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-07-20 06:02:58,152 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:02:58" (1/1) ... [2022-07-20 06:02:58,152 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:02:58" (1/1) ... [2022-07-20 06:02:58,157 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:02:58" (1/1) ... [2022-07-20 06:02:58,158 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:02:58" (1/1) ... [2022-07-20 06:02:58,167 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:02:58" (1/1) ... [2022-07-20 06:02:58,175 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:02:58" (1/1) ... [2022-07-20 06:02:58,178 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:02:58" (1/1) ... [2022-07-20 06:02:58,187 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-07-20 06:02:58,188 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-07-20 06:02:58,188 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-07-20 06:02:58,188 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-07-20 06:02:58,202 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:02:58" (1/1) ... [2022-07-20 06:02:58,209 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-20 06:02:58,218 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-20 06:02:58,231 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-07-20 06:02:58,233 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-07-20 06:02:58,267 INFO L130 BoogieDeclarations]: Found specification of procedure fail [2022-07-20 06:02:58,267 INFO L138 BoogieDeclarations]: Found implementation of procedure fail [2022-07-20 06:02:58,267 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-07-20 06:02:58,267 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-07-20 06:02:58,268 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-07-20 06:02:58,268 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-07-20 06:02:58,269 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-07-20 06:02:58,269 INFO L130 BoogieDeclarations]: Found specification of procedure check_seq_prev [2022-07-20 06:02:58,269 INFO L138 BoogieDeclarations]: Found implementation of procedure check_seq_prev [2022-07-20 06:02:58,269 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-07-20 06:02:58,272 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2022-07-20 06:02:58,273 INFO L130 BoogieDeclarations]: Found specification of procedure chain_node [2022-07-20 06:02:58,273 INFO L138 BoogieDeclarations]: Found implementation of procedure chain_node [2022-07-20 06:02:58,273 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-07-20 06:02:58,273 INFO L130 BoogieDeclarations]: Found specification of procedure check_seq_next [2022-07-20 06:02:58,273 INFO L138 BoogieDeclarations]: Found implementation of procedure check_seq_next [2022-07-20 06:02:58,273 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-07-20 06:02:58,274 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-07-20 06:02:58,392 INFO L234 CfgBuilder]: Building ICFG [2022-07-20 06:02:58,396 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-07-20 06:02:58,968 INFO L275 CfgBuilder]: Performing block encoding [2022-07-20 06:02:58,982 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-07-20 06:02:58,982 INFO L299 CfgBuilder]: Removed 33 assume(true) statements. [2022-07-20 06:02:58,985 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 06:02:58 BoogieIcfgContainer [2022-07-20 06:02:58,986 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-07-20 06:02:58,989 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-07-20 06:02:58,989 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-07-20 06:02:58,992 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-07-20 06:02:58,993 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 06:02:57" (1/3) ... [2022-07-20 06:02:58,993 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@417afa27 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 06:02:58, skipping insertion in model container [2022-07-20 06:02:58,994 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:02:58" (2/3) ... [2022-07-20 06:02:58,994 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@417afa27 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 06:02:58, skipping insertion in model container [2022-07-20 06:02:58,994 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 06:02:58" (3/3) ... [2022-07-20 06:02:58,996 INFO L111 eAbstractionObserver]: Analyzing ICFG sll_to_dll_rev-2.i [2022-07-20 06:02:59,010 INFO L201 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-07-20 06:02:59,011 INFO L160 ceAbstractionStarter]: Applying trace abstraction to program that has 83 error locations. [2022-07-20 06:02:59,059 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-20 06:02:59,065 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=FINITE_AUTOMATA, 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=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@4d9b6325, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@1b537b98 [2022-07-20 06:02:59,065 INFO L358 AbstractCegarLoop]: Starting to check reachability of 83 error locations. [2022-07-20 06:02:59,070 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) [2022-07-20 06:02:59,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-07-20 06:02:59,075 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:02:59,075 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-07-20 06:02:59,075 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)] === [2022-07-20 06:02:59,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:02:59,079 INFO L85 PathProgramCache]: Analyzing trace with hash 6220774, now seen corresponding path program 1 times [2022-07-20 06:02:59,088 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 06:02:59,089 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [561335434] [2022-07-20 06:02:59,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:02:59,089 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 06:02:59,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:02:59,253 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:02:59,253 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 06:02:59,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [561335434] [2022-07-20 06:02:59,255 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [561335434] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 06:02:59,255 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 06:02:59,255 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-20 06:02:59,257 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021975147] [2022-07-20 06:02:59,257 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 06:02:59,261 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-07-20 06:02:59,262 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-20 06:02:59,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-07-20 06:02:59,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-07-20 06:02:59,295 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) [2022-07-20 06:02:59,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:02:59,337 INFO L93 Difference]: Finished difference Result 221 states and 242 transitions. [2022-07-20 06:02:59,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-07-20 06:02:59,339 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 [2022-07-20 06:02:59,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:02:59,350 INFO L225 Difference]: With dead ends: 221 [2022-07-20 06:02:59,350 INFO L226 Difference]: Without dead ends: 219 [2022-07-20 06:02:59,352 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 [2022-07-20 06:02:59,357 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 [2022-07-20 06:02:59,359 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] [2022-07-20 06:02:59,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2022-07-20 06:02:59,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 219. [2022-07-20 06:02:59,418 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) [2022-07-20 06:02:59,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 240 transitions. [2022-07-20 06:02:59,434 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 240 transitions. Word has length 4 [2022-07-20 06:02:59,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:02:59,435 INFO L495 AbstractCegarLoop]: Abstraction has 219 states and 240 transitions. [2022-07-20 06:02:59,436 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) [2022-07-20 06:02:59,436 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 240 transitions. [2022-07-20 06:02:59,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-07-20 06:02:59,437 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:02:59,437 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-07-20 06:02:59,437 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-07-20 06:02:59,437 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)] === [2022-07-20 06:02:59,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:02:59,438 INFO L85 PathProgramCache]: Analyzing trace with hash 1692154958, now seen corresponding path program 1 times [2022-07-20 06:02:59,438 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 06:02:59,439 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1801092936] [2022-07-20 06:02:59,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:02:59,439 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 06:02:59,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:02:59,553 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:02:59,554 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 06:02:59,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1801092936] [2022-07-20 06:02:59,554 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1801092936] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 06:02:59,555 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 06:02:59,555 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-20 06:02:59,555 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031224436] [2022-07-20 06:02:59,555 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 06:02:59,557 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-20 06:02:59,557 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-20 06:02:59,558 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-20 06:02:59,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-20 06:02:59,559 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) [2022-07-20 06:02:59,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:02:59,752 INFO L93 Difference]: Finished difference Result 217 states and 238 transitions. [2022-07-20 06:02:59,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-20 06:02:59,761 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 [2022-07-20 06:02:59,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:02:59,762 INFO L225 Difference]: With dead ends: 217 [2022-07-20 06:02:59,762 INFO L226 Difference]: Without dead ends: 217 [2022-07-20 06:02:59,763 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 [2022-07-20 06:02:59,764 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, 0.2s IncrementalHoareTripleChecker+Time [2022-07-20 06:02:59,764 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 367 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-20 06:02:59,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2022-07-20 06:02:59,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 217. [2022-07-20 06:02:59,773 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) [2022-07-20 06:02:59,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 238 transitions. [2022-07-20 06:02:59,774 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 238 transitions. Word has length 6 [2022-07-20 06:02:59,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:02:59,774 INFO L495 AbstractCegarLoop]: Abstraction has 217 states and 238 transitions. [2022-07-20 06:02:59,775 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) [2022-07-20 06:02:59,775 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 238 transitions. [2022-07-20 06:02:59,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-07-20 06:02:59,775 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:02:59,775 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-07-20 06:02:59,776 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-07-20 06:02:59,776 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)] === [2022-07-20 06:02:59,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:02:59,777 INFO L85 PathProgramCache]: Analyzing trace with hash 1692154959, now seen corresponding path program 1 times [2022-07-20 06:02:59,777 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 06:02:59,777 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1133873846] [2022-07-20 06:02:59,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:02:59,778 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 06:02:59,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:02:59,846 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:02:59,847 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 06:02:59,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1133873846] [2022-07-20 06:02:59,847 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1133873846] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 06:02:59,849 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 06:02:59,849 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-20 06:02:59,849 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044224214] [2022-07-20 06:02:59,849 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 06:02:59,850 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-20 06:02:59,850 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-20 06:02:59,851 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-20 06:02:59,851 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-20 06:02:59,851 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) [2022-07-20 06:02:59,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:02:59,983 INFO L93 Difference]: Finished difference Result 215 states and 236 transitions. [2022-07-20 06:02:59,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-20 06:02:59,984 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 [2022-07-20 06:02:59,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:02:59,985 INFO L225 Difference]: With dead ends: 215 [2022-07-20 06:02:59,986 INFO L226 Difference]: Without dead ends: 215 [2022-07-20 06:02:59,986 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 [2022-07-20 06:02:59,988 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 [2022-07-20 06:02:59,990 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] [2022-07-20 06:02:59,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2022-07-20 06:03:00,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 215. [2022-07-20 06:03:00,004 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) [2022-07-20 06:03:00,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 236 transitions. [2022-07-20 06:03:00,007 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 236 transitions. Word has length 6 [2022-07-20 06:03:00,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:03:00,007 INFO L495 AbstractCegarLoop]: Abstraction has 215 states and 236 transitions. [2022-07-20 06:03:00,008 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) [2022-07-20 06:03:00,008 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 236 transitions. [2022-07-20 06:03:00,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-07-20 06:03:00,008 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:03:00,009 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 06:03:00,009 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-07-20 06:03:00,009 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)] === [2022-07-20 06:03:00,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:03:00,010 INFO L85 PathProgramCache]: Analyzing trace with hash -387700622, now seen corresponding path program 1 times [2022-07-20 06:03:00,010 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 06:03:00,010 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [998615512] [2022-07-20 06:03:00,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:00,011 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 06:03:00,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:00,136 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:03:00,136 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 06:03:00,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [998615512] [2022-07-20 06:03:00,137 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [998615512] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 06:03:00,137 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 06:03:00,137 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-07-20 06:03:00,137 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860347589] [2022-07-20 06:03:00,138 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 06:03:00,138 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-07-20 06:03:00,138 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-20 06:03:00,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-07-20 06:03:00,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-07-20 06:03:00,139 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) [2022-07-20 06:03:00,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:03:00,343 INFO L93 Difference]: Finished difference Result 210 states and 231 transitions. [2022-07-20 06:03:00,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-07-20 06:03:00,345 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 [2022-07-20 06:03:00,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:03:00,346 INFO L225 Difference]: With dead ends: 210 [2022-07-20 06:03:00,346 INFO L226 Difference]: Without dead ends: 210 [2022-07-20 06:03:00,347 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-07-20 06:03:00,356 INFO L413 NwaCegarLoop]: 208 mSDtfsCounter, 60 mSDsluCounter, 398 mSDsCounter, 0 mSdLazyCounter, 258 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 606 SdHoareTripleChecker+Invalid, 269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 258 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-20 06:03:00,357 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 606 Invalid, 269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 258 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-20 06:03:00,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2022-07-20 06:03:00,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 210. [2022-07-20 06:03:00,383 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) [2022-07-20 06:03:00,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 231 transitions. [2022-07-20 06:03:00,384 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 231 transitions. Word has length 10 [2022-07-20 06:03:00,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:03:00,385 INFO L495 AbstractCegarLoop]: Abstraction has 210 states and 231 transitions. [2022-07-20 06:03:00,385 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) [2022-07-20 06:03:00,385 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 231 transitions. [2022-07-20 06:03:00,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-07-20 06:03:00,386 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:03:00,386 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 06:03:00,387 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-07-20 06:03:00,387 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)] === [2022-07-20 06:03:00,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:03:00,388 INFO L85 PathProgramCache]: Analyzing trace with hash -387700621, now seen corresponding path program 1 times [2022-07-20 06:03:00,388 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 06:03:00,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1506497005] [2022-07-20 06:03:00,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:00,389 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 06:03:00,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:00,496 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:03:00,496 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 06:03:00,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1506497005] [2022-07-20 06:03:00,496 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1506497005] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 06:03:00,497 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 06:03:00,497 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-07-20 06:03:00,497 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [185148043] [2022-07-20 06:03:00,497 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 06:03:00,498 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-07-20 06:03:00,498 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-20 06:03:00,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-07-20 06:03:00,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-07-20 06:03:00,499 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) [2022-07-20 06:03:00,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:03:00,765 INFO L93 Difference]: Finished difference Result 205 states and 226 transitions. [2022-07-20 06:03:00,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-07-20 06:03:00,765 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 [2022-07-20 06:03:00,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:03:00,767 INFO L225 Difference]: With dead ends: 205 [2022-07-20 06:03:00,767 INFO L226 Difference]: Without dead ends: 205 [2022-07-20 06:03:00,770 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 [2022-07-20 06:03:00,772 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 [2022-07-20 06:03:00,773 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] [2022-07-20 06:03:00,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2022-07-20 06:03:00,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2022-07-20 06:03:00,788 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) [2022-07-20 06:03:00,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 226 transitions. [2022-07-20 06:03:00,790 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 226 transitions. Word has length 10 [2022-07-20 06:03:00,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:03:00,795 INFO L495 AbstractCegarLoop]: Abstraction has 205 states and 226 transitions. [2022-07-20 06:03:00,795 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) [2022-07-20 06:03:00,795 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 226 transitions. [2022-07-20 06:03:00,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-07-20 06:03:00,796 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:03:00,796 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 06:03:00,796 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-07-20 06:03:00,797 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)] === [2022-07-20 06:03:00,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:03:00,799 INFO L85 PathProgramCache]: Analyzing trace with hash 866182740, now seen corresponding path program 1 times [2022-07-20 06:03:00,799 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 06:03:00,799 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119513264] [2022-07-20 06:03:00,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:00,800 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 06:03:00,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:00,879 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:03:00,879 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 06:03:00,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119513264] [2022-07-20 06:03:00,880 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2119513264] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 06:03:00,881 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 06:03:00,881 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-07-20 06:03:00,881 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [826999162] [2022-07-20 06:03:00,881 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 06:03:00,882 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-07-20 06:03:00,882 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-20 06:03:00,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-07-20 06:03:00,883 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-07-20 06:03:00,883 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) [2022-07-20 06:03:01,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:03:01,041 INFO L93 Difference]: Finished difference Result 204 states and 225 transitions. [2022-07-20 06:03:01,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-07-20 06:03:01,042 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 [2022-07-20 06:03:01,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:03:01,043 INFO L225 Difference]: With dead ends: 204 [2022-07-20 06:03:01,044 INFO L226 Difference]: Without dead ends: 204 [2022-07-20 06:03:01,044 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 [2022-07-20 06:03:01,047 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 [2022-07-20 06:03:01,049 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] [2022-07-20 06:03:01,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2022-07-20 06:03:01,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 204. [2022-07-20 06:03:01,060 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) [2022-07-20 06:03:01,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 225 transitions. [2022-07-20 06:03:01,062 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 225 transitions. Word has length 11 [2022-07-20 06:03:01,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:03:01,062 INFO L495 AbstractCegarLoop]: Abstraction has 204 states and 225 transitions. [2022-07-20 06:03:01,063 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) [2022-07-20 06:03:01,063 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 225 transitions. [2022-07-20 06:03:01,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-07-20 06:03:01,063 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:03:01,063 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 06:03:01,064 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-07-20 06:03:01,064 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)] === [2022-07-20 06:03:01,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:03:01,065 INFO L85 PathProgramCache]: Analyzing trace with hash 866182741, now seen corresponding path program 1 times [2022-07-20 06:03:01,065 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 06:03:01,065 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1181895593] [2022-07-20 06:03:01,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:01,066 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 06:03:01,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:01,154 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:03:01,154 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 06:03:01,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1181895593] [2022-07-20 06:03:01,155 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1181895593] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 06:03:01,155 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 06:03:01,155 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-07-20 06:03:01,156 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79336203] [2022-07-20 06:03:01,156 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 06:03:01,156 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-07-20 06:03:01,156 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-20 06:03:01,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-07-20 06:03:01,157 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-07-20 06:03:01,157 INFO L87 Difference]: Start difference. First operand 204 states and 225 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 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) [2022-07-20 06:03:01,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:03:01,342 INFO L93 Difference]: Finished difference Result 203 states and 224 transitions. [2022-07-20 06:03:01,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-07-20 06:03:01,343 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 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 [2022-07-20 06:03:01,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:03:01,344 INFO L225 Difference]: With dead ends: 203 [2022-07-20 06:03:01,344 INFO L226 Difference]: Without dead ends: 203 [2022-07-20 06:03:01,344 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2022-07-20 06:03:01,345 INFO L413 NwaCegarLoop]: 216 mSDtfsCounter, 20 mSDsluCounter, 642 mSDsCounter, 0 mSdLazyCounter, 227 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 858 SdHoareTripleChecker+Invalid, 228 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-20 06:03:01,346 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 858 Invalid, 228 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 227 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-20 06:03:01,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2022-07-20 06:03:01,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 203. [2022-07-20 06:03:01,350 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) [2022-07-20 06:03:01,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 224 transitions. [2022-07-20 06:03:01,351 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 224 transitions. Word has length 11 [2022-07-20 06:03:01,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:03:01,352 INFO L495 AbstractCegarLoop]: Abstraction has 203 states and 224 transitions. [2022-07-20 06:03:01,352 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 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) [2022-07-20 06:03:01,352 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 224 transitions. [2022-07-20 06:03:01,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-07-20 06:03:01,353 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:03:01,353 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 06:03:01,353 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-07-20 06:03:01,354 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)] === [2022-07-20 06:03:01,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:03:01,354 INFO L85 PathProgramCache]: Analyzing trace with hash -610249734, now seen corresponding path program 1 times [2022-07-20 06:03:01,355 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 06:03:01,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1347610320] [2022-07-20 06:03:01,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:01,355 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 06:03:01,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:01,465 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-07-20 06:03:01,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:01,539 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:03:01,540 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 06:03:01,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1347610320] [2022-07-20 06:03:01,540 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1347610320] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 06:03:01,540 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 06:03:01,540 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-07-20 06:03:01,540 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [708750503] [2022-07-20 06:03:01,541 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 06:03:01,541 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-07-20 06:03:01,541 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-20 06:03:01,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-07-20 06:03:01,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2022-07-20 06:03:01,542 INFO L87 Difference]: Start difference. First operand 203 states and 224 transitions. Second operand has 7 states, 6 states have (on average 2.8333333333333335) 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) [2022-07-20 06:03:01,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:03:01,974 INFO L93 Difference]: Finished difference Result 202 states and 223 transitions. [2022-07-20 06:03:01,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-07-20 06:03:01,975 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.8333333333333335) 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 [2022-07-20 06:03:01,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:03:01,976 INFO L225 Difference]: With dead ends: 202 [2022-07-20 06:03:01,976 INFO L226 Difference]: Without dead ends: 202 [2022-07-20 06:03:01,976 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2022-07-20 06:03:01,977 INFO L413 NwaCegarLoop]: 192 mSDtfsCounter, 72 mSDsluCounter, 370 mSDsCounter, 0 mSdLazyCounter, 588 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 562 SdHoareTripleChecker+Invalid, 610 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 588 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-07-20 06:03:01,994 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 562 Invalid, 610 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 588 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-07-20 06:03:01,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2022-07-20 06:03:01,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 202. [2022-07-20 06:03:01,999 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) [2022-07-20 06:03:02,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 223 transitions. [2022-07-20 06:03:02,000 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 223 transitions. Word has length 19 [2022-07-20 06:03:02,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:03:02,001 INFO L495 AbstractCegarLoop]: Abstraction has 202 states and 223 transitions. [2022-07-20 06:03:02,001 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.8333333333333335) 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) [2022-07-20 06:03:02,001 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 223 transitions. [2022-07-20 06:03:02,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-07-20 06:03:02,002 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:03:02,002 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 06:03:02,002 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-07-20 06:03:02,002 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)] === [2022-07-20 06:03:02,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:03:02,002 INFO L85 PathProgramCache]: Analyzing trace with hash -610249733, now seen corresponding path program 1 times [2022-07-20 06:03:02,003 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 06:03:02,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [856985391] [2022-07-20 06:03:02,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:02,003 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 06:03:02,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:02,078 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-07-20 06:03:02,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:02,147 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:03:02,147 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 06:03:02,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [856985391] [2022-07-20 06:03:02,148 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [856985391] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 06:03:02,148 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 06:03:02,148 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-07-20 06:03:02,148 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364329245] [2022-07-20 06:03:02,148 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 06:03:02,149 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-07-20 06:03:02,149 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-20 06:03:02,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-07-20 06:03:02,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2022-07-20 06:03:02,150 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) [2022-07-20 06:03:02,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:03:02,540 INFO L93 Difference]: Finished difference Result 210 states and 235 transitions. [2022-07-20 06:03:02,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-20 06:03:02,541 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 [2022-07-20 06:03:02,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:03:02,543 INFO L225 Difference]: With dead ends: 210 [2022-07-20 06:03:02,543 INFO L226 Difference]: Without dead ends: 210 [2022-07-20 06:03:02,544 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 [2022-07-20 06:03:02,544 INFO L413 NwaCegarLoop]: 201 mSDtfsCounter, 56 mSDsluCounter, 320 mSDsCounter, 0 mSdLazyCounter, 472 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 521 SdHoareTripleChecker+Invalid, 494 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 472 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-07-20 06:03:02,545 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 521 Invalid, 494 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 472 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-07-20 06:03:02,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2022-07-20 06:03:02,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 207. [2022-07-20 06:03:02,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 120 states have (on average 1.6833333333333333) internal successors, (202), 192 states have internal predecessors, (202), 18 states have call successors, (18), 4 states have call predecessors, (18), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-07-20 06:03:02,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 230 transitions. [2022-07-20 06:03:02,551 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 230 transitions. Word has length 19 [2022-07-20 06:03:02,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:03:02,552 INFO L495 AbstractCegarLoop]: Abstraction has 207 states and 230 transitions. [2022-07-20 06:03:02,552 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) [2022-07-20 06:03:02,552 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 230 transitions. [2022-07-20 06:03:02,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-07-20 06:03:02,553 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:03:02,553 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-07-20 06:03:02,553 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-07-20 06:03:02,554 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-07-20 06:03:02,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:03:02,554 INFO L85 PathProgramCache]: Analyzing trace with hash 450998278, now seen corresponding path program 1 times [2022-07-20 06:03:02,554 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 06:03:02,554 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1747200062] [2022-07-20 06:03:02,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:02,555 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 06:03:02,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:02,694 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-07-20 06:03:02,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:02,747 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-07-20 06:03:02,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:02,811 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-07-20 06:03:02,811 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 06:03:02,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1747200062] [2022-07-20 06:03:02,812 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1747200062] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-20 06:03:02,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1558674189] [2022-07-20 06:03:02,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:02,812 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-20 06:03:02,813 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-20 06:03:02,815 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-20 06:03:02,818 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-07-20 06:03:02,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:02,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 36 conjunts are in the unsatisfiable core [2022-07-20 06:03:02,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:03:03,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:03:03,054 INFO L356 Elim1Store]: treesize reduction 24, result has 33.3 percent of original size [2022-07-20 06:03:03,055 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 23 [2022-07-20 06:03:03,092 INFO L356 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2022-07-20 06:03:03,092 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 2 case distinctions, treesize of input 111 treesize of output 117 [2022-07-20 06:03:03,179 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-20 06:03:03,185 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-20 06:03:03,353 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:03:03,355 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-20 06:03:03,359 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:03:03,361 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-07-20 06:03:03,392 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-20 06:03:03,515 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:03:03,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 06:03:03,625 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1558674189] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-20 06:03:03,625 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-20 06:03:03,625 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 10] total 12 [2022-07-20 06:03:03,626 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [95705670] [2022-07-20 06:03:03,626 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-20 06:03:03,626 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-07-20 06:03:03,627 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-20 06:03:03,627 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-07-20 06:03:03,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2022-07-20 06:03:03,627 INFO L87 Difference]: Start difference. First operand 207 states and 230 transitions. Second operand has 13 states, 11 states have (on average 3.272727272727273) internal successors, (36), 10 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-07-20 06:03:03,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:03:03,973 INFO L93 Difference]: Finished difference Result 207 states and 231 transitions. [2022-07-20 06:03:03,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-07-20 06:03:03,974 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 3.272727272727273) internal successors, (36), 10 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 34 [2022-07-20 06:03:03,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:03:03,975 INFO L225 Difference]: With dead ends: 207 [2022-07-20 06:03:03,975 INFO L226 Difference]: Without dead ends: 207 [2022-07-20 06:03:03,975 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2022-07-20 06:03:03,976 INFO L413 NwaCegarLoop]: 198 mSDtfsCounter, 92 mSDsluCounter, 519 mSDsCounter, 0 mSdLazyCounter, 435 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 717 SdHoareTripleChecker+Invalid, 677 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 435 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 206 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-20 06:03:03,976 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [92 Valid, 717 Invalid, 677 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 435 Invalid, 0 Unknown, 206 Unchecked, 0.3s Time] [2022-07-20 06:03:03,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2022-07-20 06:03:03,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 201. [2022-07-20 06:03:03,980 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) [2022-07-20 06:03:03,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 222 transitions. [2022-07-20 06:03:03,981 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 222 transitions. Word has length 34 [2022-07-20 06:03:03,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:03:03,981 INFO L495 AbstractCegarLoop]: Abstraction has 201 states and 222 transitions. [2022-07-20 06:03:03,982 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 3.272727272727273) internal successors, (36), 10 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-07-20 06:03:03,982 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 222 transitions. [2022-07-20 06:03:03,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-07-20 06:03:03,982 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:03:03,983 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] [2022-07-20 06:03:04,015 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-07-20 06:03:04,195 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-07-20 06:03:04,196 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-07-20 06:03:04,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:03:04,196 INFO L85 PathProgramCache]: Analyzing trace with hash 50383991, now seen corresponding path program 1 times [2022-07-20 06:03:04,196 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 06:03:04,196 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [134707430] [2022-07-20 06:03:04,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:04,197 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 06:03:04,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:04,327 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-07-20 06:03:04,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:04,395 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2022-07-20 06:03:04,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:04,458 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-20 06:03:04,458 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 06:03:04,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [134707430] [2022-07-20 06:03:04,458 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [134707430] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-20 06:03:04,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2088237779] [2022-07-20 06:03:04,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:04,459 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-20 06:03:04,459 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-20 06:03:04,461 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-20 06:03:04,481 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-07-20 06:03:04,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:04,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 36 conjunts are in the unsatisfiable core [2022-07-20 06:03:04,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:03:04,645 INFO L356 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-07-20 06:03:04,646 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 12 treesize of output 24 [2022-07-20 06:03:04,759 INFO L356 Elim1Store]: treesize reduction 20, result has 57.4 percent of original size [2022-07-20 06:03:04,760 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 25 treesize of output 46 [2022-07-20 06:03:05,101 INFO L356 Elim1Store]: treesize reduction 24, result has 48.9 percent of original size [2022-07-20 06:03:05,101 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 21 treesize of output 38 [2022-07-20 06:03:05,183 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-07-20 06:03:05,183 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 06:03:05,587 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2088237779] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-20 06:03:05,587 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-20 06:03:05,587 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 17 [2022-07-20 06:03:05,588 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430778113] [2022-07-20 06:03:05,588 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-20 06:03:05,588 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-07-20 06:03:05,588 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-20 06:03:05,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-07-20 06:03:05,589 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=523, Unknown=0, NotChecked=0, Total=650 [2022-07-20 06:03:05,589 INFO L87 Difference]: Start difference. First operand 201 states and 222 transitions. Second operand has 18 states, 15 states have (on average 4.066666666666666) internal successors, (61), 16 states have internal predecessors, (61), 4 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2022-07-20 06:03:06,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:03:06,201 INFO L93 Difference]: Finished difference Result 203 states and 226 transitions. [2022-07-20 06:03:06,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-07-20 06:03:06,202 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 15 states have (on average 4.066666666666666) internal successors, (61), 16 states have internal predecessors, (61), 4 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) Word has length 37 [2022-07-20 06:03:06,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:03:06,203 INFO L225 Difference]: With dead ends: 203 [2022-07-20 06:03:06,203 INFO L226 Difference]: Without dead ends: 203 [2022-07-20 06:03:06,204 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 43 SyntacticMatches, 4 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 246 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=186, Invalid=744, Unknown=0, NotChecked=0, Total=930 [2022-07-20 06:03:06,205 INFO L413 NwaCegarLoop]: 193 mSDtfsCounter, 226 mSDsluCounter, 737 mSDsCounter, 0 mSdLazyCounter, 568 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 930 SdHoareTripleChecker+Invalid, 1044 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 568 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 417 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-07-20 06:03:06,205 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [226 Valid, 930 Invalid, 1044 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 568 Invalid, 0 Unknown, 417 Unchecked, 0.4s Time] [2022-07-20 06:03:06,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2022-07-20 06:03:06,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 200. [2022-07-20 06:03:06,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 116 states have (on average 1.6810344827586208) internal successors, (195), 186 states have internal predecessors, (195), 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) [2022-07-20 06:03:06,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 221 transitions. [2022-07-20 06:03:06,210 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 221 transitions. Word has length 37 [2022-07-20 06:03:06,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:03:06,211 INFO L495 AbstractCegarLoop]: Abstraction has 200 states and 221 transitions. [2022-07-20 06:03:06,211 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 15 states have (on average 4.066666666666666) internal successors, (61), 16 states have internal predecessors, (61), 4 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2022-07-20 06:03:06,211 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 221 transitions. [2022-07-20 06:03:06,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-07-20 06:03:06,212 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:03:06,212 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] [2022-07-20 06:03:06,242 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-07-20 06:03:06,428 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-07-20 06:03:06,429 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-07-20 06:03:06,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:03:06,429 INFO L85 PathProgramCache]: Analyzing trace with hash 50383992, now seen corresponding path program 1 times [2022-07-20 06:03:06,429 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 06:03:06,429 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1731291025] [2022-07-20 06:03:06,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:06,429 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 06:03:06,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:06,560 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-07-20 06:03:06,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:06,612 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2022-07-20 06:03:06,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:06,665 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-20 06:03:06,665 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 06:03:06,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1731291025] [2022-07-20 06:03:06,666 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1731291025] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-20 06:03:06,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [195107861] [2022-07-20 06:03:06,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:06,666 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-20 06:03:06,666 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-20 06:03:06,668 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-20 06:03:06,694 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-07-20 06:03:06,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:06,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 30 conjunts are in the unsatisfiable core [2022-07-20 06:03:06,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:03:06,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:03:06,887 INFO L356 Elim1Store]: treesize reduction 20, result has 48.7 percent of original size [2022-07-20 06:03:06,888 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 12 treesize of output 24 [2022-07-20 06:03:06,894 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-07-20 06:03:07,075 WARN L319 FreeRefinementEngine]: Global settings require throwing the following exception [2022-07-20 06:03:07,106 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-07-20 06:03:07,284 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-20 06:03:07,285 FATAL L? ?]: An unrecoverable error occured during an interaction with an SMT solver: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: line 92657 column 46: unknown constant v_old(#length)_AFTER_CALL_5 at de.uni_freiburg.informatik.ultimate.smtsolver.external.Parser$Action$.CUP$do_action(Parser.java:1458) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Parser.do_action(Parser.java:658) at com.github.jhoenicke.javacup.runtime.LRParser.parse(LRParser.java:383) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:239) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parseSuccess(Executor.java:258) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Scriptor.assertTerm(Scriptor.java:147) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.arrays.DiffWrapperScript$DiffTransformer.checkOrAddAxiom(DiffWrapperScript.java:161) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.arrays.DiffWrapperScript$DiffTransformer.convertApplicationTerm(DiffWrapperScript.java:171) at de.uni_freiburg.informatik.ultimate.logic.TermTransformer$BuildApplicationTerm.walk(TermTransformer.java:352) at de.uni_freiburg.informatik.ultimate.logic.NonRecursive.run(NonRecursive.java:115) at de.uni_freiburg.informatik.ultimate.logic.NonRecursive.run(NonRecursive.java:106) at de.uni_freiburg.informatik.ultimate.logic.TermTransformer.transform(TermTransformer.java:285) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.arrays.DiffWrapperScript.assertTerm(DiffWrapperScript.java:109) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.assertTerm(WrapperScript.java:158) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.assertTerm(ManagedScript.java:134) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.MonolithicImplicationChecker.checkImplication(MonolithicImplicationChecker.java:83) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier$PredicateComparison.compare(PredicateUnifier.java:824) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier$PredicateComparison.(PredicateUnifier.java:768) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate(PredicateUnifier.java:345) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate(PredicateUnifier.java:305) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp$UnifyPostprocessor.postprocess(TraceCheckSpWp.java:582) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer.applyPostprocessors(IterativePredicateTransformer.java:420) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer.computeStrongestPostconditionSequence(IterativePredicateTransformer.java:199) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.computeInterpolantsUsingUnsatCore(TraceCheckSpWp.java:299) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.computeInterpolants(TraceCheckSpWp.java:185) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.(TraceCheckSpWp.java:163) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSpWp.construct(IpTcStrategyModuleSpWp.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSpWp.construct(IpTcStrategyModuleSpWp.java:1) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:248) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:409) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:300) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:260) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:152) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-07-20 06:03:07,289 INFO L158 Benchmark]: Toolchain (without parser) took 9703.08ms. Allocated memory was 94.4MB in the beginning and 163.6MB in the end (delta: 69.2MB). Free memory was 61.9MB in the beginning and 104.8MB in the end (delta: -42.9MB). Peak memory consumption was 26.7MB. Max. memory is 16.1GB. [2022-07-20 06:03:07,289 INFO L158 Benchmark]: CDTParser took 0.27ms. Allocated memory is still 94.4MB. Free memory was 51.0MB in the beginning and 50.9MB in the end (delta: 42.0kB). There was no memory consumed. Max. memory is 16.1GB. [2022-07-20 06:03:07,290 INFO L158 Benchmark]: CACSL2BoogieTranslator took 506.32ms. Allocated memory is still 94.4MB. Free memory was 61.6MB in the beginning and 60.5MB in the end (delta: 1.1MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2022-07-20 06:03:07,290 INFO L158 Benchmark]: Boogie Procedure Inliner took 46.33ms. Allocated memory is still 94.4MB. Free memory was 60.5MB in the beginning and 58.0MB in the end (delta: 2.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-07-20 06:03:07,290 INFO L158 Benchmark]: Boogie Preprocessor took 41.03ms. Allocated memory is still 94.4MB. Free memory was 58.0MB in the beginning and 55.6MB in the end (delta: 2.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-07-20 06:03:07,290 INFO L158 Benchmark]: RCFGBuilder took 798.22ms. Allocated memory was 94.4MB in the beginning and 113.2MB in the end (delta: 18.9MB). Free memory was 55.6MB in the beginning and 77.4MB in the end (delta: -21.8MB). Peak memory consumption was 27.3MB. Max. memory is 16.1GB. [2022-07-20 06:03:07,290 INFO L158 Benchmark]: TraceAbstraction took 8299.96ms. Allocated memory was 113.2MB in the beginning and 163.6MB in the end (delta: 50.3MB). Free memory was 76.8MB in the beginning and 104.8MB in the end (delta: -28.0MB). Peak memory consumption was 23.1MB. Max. memory is 16.1GB. [2022-07-20 06:03:07,292 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27ms. Allocated memory is still 94.4MB. Free memory was 51.0MB in the beginning and 50.9MB in the end (delta: 42.0kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 506.32ms. Allocated memory is still 94.4MB. Free memory was 61.6MB in the beginning and 60.5MB in the end (delta: 1.1MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 46.33ms. Allocated memory is still 94.4MB. Free memory was 60.5MB in the beginning and 58.0MB in the end (delta: 2.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 41.03ms. Allocated memory is still 94.4MB. Free memory was 58.0MB in the beginning and 55.6MB in the end (delta: 2.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 798.22ms. Allocated memory was 94.4MB in the beginning and 113.2MB in the end (delta: 18.9MB). Free memory was 55.6MB in the beginning and 77.4MB in the end (delta: -21.8MB). Peak memory consumption was 27.3MB. Max. memory is 16.1GB. * TraceAbstraction took 8299.96ms. Allocated memory was 113.2MB in the beginning and 163.6MB in the end (delta: 50.3MB). Free memory was 76.8MB in the beginning and 104.8MB in the end (delta: -28.0MB). Peak memory consumption was 23.1MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: SMTLIBException: line 92657 column 46: unknown constant v_old(#length)_AFTER_CALL_5 de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMTLIBException: line 92657 column 46: unknown constant v_old(#length)_AFTER_CALL_5: de.uni_freiburg.informatik.ultimate.smtsolver.external.Parser$Action$.CUP$do_action(Parser.java:1458) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2022-07-20 06:03:07,315 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 1 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/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_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G 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-?-eb692b5 [2022-07-20 06:03:09,351 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-20 06:03:09,354 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-20 06:03:09,396 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-20 06:03:09,397 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-20 06:03:09,398 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-20 06:03:09,402 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-20 06:03:09,406 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-20 06:03:09,408 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-20 06:03:09,409 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-20 06:03:09,410 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-20 06:03:09,415 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-20 06:03:09,415 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-20 06:03:09,420 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-20 06:03:09,421 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-20 06:03:09,424 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-20 06:03:09,425 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-20 06:03:09,426 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-20 06:03:09,428 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-20 06:03:09,434 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-20 06:03:09,436 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-20 06:03:09,436 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-20 06:03:09,438 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-20 06:03:09,439 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-20 06:03:09,441 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-20 06:03:09,448 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-20 06:03:09,448 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-20 06:03:09,448 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-20 06:03:09,449 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-20 06:03:09,450 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-20 06:03:09,450 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-20 06:03:09,451 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-20 06:03:09,453 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-20 06:03:09,453 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-20 06:03:09,455 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-20 06:03:09,456 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-20 06:03:09,456 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-20 06:03:09,456 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-20 06:03:09,457 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-20 06:03:09,457 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-20 06:03:09,457 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-20 06:03:09,459 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-20 06:03:09,466 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf [2022-07-20 06:03:09,500 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-20 06:03:09,501 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-20 06:03:09,501 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-20 06:03:09,502 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-20 06:03:09,502 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-07-20 06:03:09,503 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-07-20 06:03:09,503 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-20 06:03:09,504 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-20 06:03:09,504 INFO L138 SettingsManager]: * Use SBE=true [2022-07-20 06:03:09,505 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-20 06:03:09,505 INFO L138 SettingsManager]: * sizeof long=4 [2022-07-20 06:03:09,505 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-07-20 06:03:09,505 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-07-20 06:03:09,505 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-07-20 06:03:09,506 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-20 06:03:09,517 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-07-20 06:03:09,517 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-07-20 06:03:09,518 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-07-20 06:03:09,518 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-07-20 06:03:09,518 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-07-20 06:03:09,518 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2022-07-20 06:03:09,518 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2022-07-20 06:03:09,519 INFO L138 SettingsManager]: * sizeof long double=12 [2022-07-20 06:03:09,519 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-20 06:03:09,519 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-20 06:03:09,519 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-20 06:03:09,519 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-07-20 06:03:09,520 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-20 06:03:09,520 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-20 06:03:09,520 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-07-20 06:03:09,521 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2022-07-20 06:03:09,521 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2022-07-20 06:03:09,521 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-07-20 06:03:09,521 INFO L138 SettingsManager]: * Logic for external solver=AUFBV WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8f9453cad2383b5119b308e041fed5f4a740e7abd43cb8ad7833872af20a8d57 [2022-07-20 06:03:09,873 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-20 06:03:09,895 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-20 06:03:09,898 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-20 06:03:09,899 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-20 06:03:09,900 INFO L275 PluginConnector]: CDTParser initialized [2022-07-20 06:03:09,902 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i [2022-07-20 06:03:09,972 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/163fa33cc/9f477cde1fdf4e01b38c2dde99f1a614/FLAGeb77270c2 [2022-07-20 06:03:10,552 INFO L306 CDTParser]: Found 1 translation units. [2022-07-20 06:03:10,556 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i [2022-07-20 06:03:10,567 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/163fa33cc/9f477cde1fdf4e01b38c2dde99f1a614/FLAGeb77270c2 [2022-07-20 06:03:10,934 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/163fa33cc/9f477cde1fdf4e01b38c2dde99f1a614 [2022-07-20 06:03:10,937 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-20 06:03:10,938 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-20 06:03:10,940 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-20 06:03:10,940 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-20 06:03:10,943 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-20 06:03:10,944 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 06:03:10" (1/1) ... [2022-07-20 06:03:10,945 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@415beb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:03:10, skipping insertion in model container [2022-07-20 06:03:10,945 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 06:03:10" (1/1) ... [2022-07-20 06:03:10,952 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-20 06:03:11,004 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-20 06:03:11,296 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i[22636,22649] [2022-07-20 06:03:11,320 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-20 06:03:11,337 INFO L203 MainTranslator]: Completed pre-run [2022-07-20 06:03:11,364 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i[22636,22649] [2022-07-20 06:03:11,379 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-20 06:03:11,407 INFO L208 MainTranslator]: Completed translation [2022-07-20 06:03:11,408 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:03:11 WrapperNode [2022-07-20 06:03:11,408 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-20 06:03:11,409 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-07-20 06:03:11,410 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-07-20 06:03:11,410 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-07-20 06:03:11,416 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:03:11" (1/1) ... [2022-07-20 06:03:11,439 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:03:11" (1/1) ... [2022-07-20 06:03:11,479 INFO L137 Inliner]: procedures = 130, calls = 79, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 201 [2022-07-20 06:03:11,479 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-07-20 06:03:11,480 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-07-20 06:03:11,481 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-07-20 06:03:11,481 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-07-20 06:03:11,488 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:03:11" (1/1) ... [2022-07-20 06:03:11,489 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:03:11" (1/1) ... [2022-07-20 06:03:11,508 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:03:11" (1/1) ... [2022-07-20 06:03:11,510 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:03:11" (1/1) ... [2022-07-20 06:03:11,520 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:03:11" (1/1) ... [2022-07-20 06:03:11,541 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:03:11" (1/1) ... [2022-07-20 06:03:11,546 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:03:11" (1/1) ... [2022-07-20 06:03:11,555 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-07-20 06:03:11,559 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-07-20 06:03:11,560 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-07-20 06:03:11,560 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-07-20 06:03:11,563 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:03:11" (1/1) ... [2022-07-20 06:03:11,570 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-20 06:03:11,581 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-20 06:03:11,591 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-07-20 06:03:11,607 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-07-20 06:03:11,635 INFO L130 BoogieDeclarations]: Found specification of procedure fail [2022-07-20 06:03:11,636 INFO L138 BoogieDeclarations]: Found implementation of procedure fail [2022-07-20 06:03:11,636 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-07-20 06:03:11,636 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-07-20 06:03:11,636 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-07-20 06:03:11,636 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-07-20 06:03:11,636 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-07-20 06:03:11,637 INFO L130 BoogieDeclarations]: Found specification of procedure check_seq_prev [2022-07-20 06:03:11,637 INFO L138 BoogieDeclarations]: Found implementation of procedure check_seq_prev [2022-07-20 06:03:11,637 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-07-20 06:03:11,637 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2022-07-20 06:03:11,637 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2022-07-20 06:03:11,637 INFO L130 BoogieDeclarations]: Found specification of procedure chain_node [2022-07-20 06:03:11,637 INFO L138 BoogieDeclarations]: Found implementation of procedure chain_node [2022-07-20 06:03:11,638 INFO L130 BoogieDeclarations]: Found specification of procedure check_seq_next [2022-07-20 06:03:11,638 INFO L138 BoogieDeclarations]: Found implementation of procedure check_seq_next [2022-07-20 06:03:11,638 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-07-20 06:03:11,638 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-07-20 06:03:11,801 INFO L234 CfgBuilder]: Building ICFG [2022-07-20 06:03:11,802 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-07-20 06:03:12,580 INFO L275 CfgBuilder]: Performing block encoding [2022-07-20 06:03:12,587 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-07-20 06:03:12,587 INFO L299 CfgBuilder]: Removed 33 assume(true) statements. [2022-07-20 06:03:12,589 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 06:03:12 BoogieIcfgContainer [2022-07-20 06:03:12,590 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-07-20 06:03:12,591 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-07-20 06:03:12,591 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-07-20 06:03:12,593 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-07-20 06:03:12,594 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 06:03:10" (1/3) ... [2022-07-20 06:03:12,594 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74812498 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 06:03:12, skipping insertion in model container [2022-07-20 06:03:12,594 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:03:11" (2/3) ... [2022-07-20 06:03:12,595 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74812498 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 06:03:12, skipping insertion in model container [2022-07-20 06:03:12,595 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 06:03:12" (3/3) ... [2022-07-20 06:03:12,596 INFO L111 eAbstractionObserver]: Analyzing ICFG sll_to_dll_rev-2.i [2022-07-20 06:03:12,608 INFO L201 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-07-20 06:03:12,609 INFO L160 ceAbstractionStarter]: Applying trace abstraction to program that has 83 error locations. [2022-07-20 06:03:12,664 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-20 06:03:12,677 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=FINITE_AUTOMATA, 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=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@179bd449, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@2f744f55 [2022-07-20 06:03:12,678 INFO L358 AbstractCegarLoop]: Starting to check reachability of 83 error locations. [2022-07-20 06:03:12,686 INFO L276 IsEmpty]: Start isEmpty. Operand has 220 states, 118 states have (on average 2.1186440677966103) internal successors, (250), 206 states have internal predecessors, (250), 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) [2022-07-20 06:03:12,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-07-20 06:03:12,691 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:03:12,692 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-07-20 06:03:12,693 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)] === [2022-07-20 06:03:12,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:03:12,700 INFO L85 PathProgramCache]: Analyzing trace with hash 6220742, now seen corresponding path program 1 times [2022-07-20 06:03:12,710 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-20 06:03:12,710 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [935572506] [2022-07-20 06:03:12,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:12,711 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-20 06:03:12,712 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-20 06:03:12,717 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-20 06:03:12,732 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2022-07-20 06:03:12,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:12,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 1 conjunts are in the unsatisfiable core [2022-07-20 06:03:12,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:03:12,853 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:03:12,853 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-20 06:03:12,854 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-20 06:03:12,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [935572506] [2022-07-20 06:03:12,854 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [935572506] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 06:03:12,855 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 06:03:12,855 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-20 06:03:12,856 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555182061] [2022-07-20 06:03:12,857 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 06:03:12,861 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-07-20 06:03:12,861 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-20 06:03:12,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-07-20 06:03:12,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-07-20 06:03:12,911 INFO L87 Difference]: Start difference. First operand has 220 states, 118 states have (on average 2.1186440677966103) internal successors, (250), 206 states have internal predecessors, (250), 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) [2022-07-20 06:03:12,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:03:12,956 INFO L93 Difference]: Finished difference Result 218 states and 239 transitions. [2022-07-20 06:03:12,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-07-20 06:03:12,958 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 [2022-07-20 06:03:12,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:03:12,969 INFO L225 Difference]: With dead ends: 218 [2022-07-20 06:03:12,969 INFO L226 Difference]: Without dead ends: 216 [2022-07-20 06:03:12,971 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-07-20 06:03:12,975 INFO L413 NwaCegarLoop]: 239 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, 239 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 [2022-07-20 06:03:12,976 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 239 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-20 06:03:12,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2022-07-20 06:03:13,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 216. [2022-07-20 06:03:13,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 113 states have (on average 1.8672566371681416) internal successors, (211), 202 states have internal predecessors, (211), 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) [2022-07-20 06:03:13,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 237 transitions. [2022-07-20 06:03:13,025 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 237 transitions. Word has length 4 [2022-07-20 06:03:13,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:03:13,026 INFO L495 AbstractCegarLoop]: Abstraction has 216 states and 237 transitions. [2022-07-20 06:03:13,026 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) [2022-07-20 06:03:13,026 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 237 transitions. [2022-07-20 06:03:13,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-07-20 06:03:13,027 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:03:13,027 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-07-20 06:03:13,035 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2022-07-20 06:03:13,227 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-20 06:03:13,228 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)] === [2022-07-20 06:03:13,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:03:13,229 INFO L85 PathProgramCache]: Analyzing trace with hash 1692065585, now seen corresponding path program 1 times [2022-07-20 06:03:13,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-20 06:03:13,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1345847075] [2022-07-20 06:03:13,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:13,232 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-20 06:03:13,232 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-20 06:03:13,234 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-20 06:03:13,235 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2022-07-20 06:03:13,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:13,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 3 conjunts are in the unsatisfiable core [2022-07-20 06:03:13,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:03:13,361 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-20 06:03:13,372 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:03:13,372 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-20 06:03:13,373 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-20 06:03:13,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1345847075] [2022-07-20 06:03:13,373 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1345847075] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 06:03:13,373 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 06:03:13,374 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-20 06:03:13,374 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [350052203] [2022-07-20 06:03:13,374 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 06:03:13,375 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-20 06:03:13,375 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-20 06:03:13,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-20 06:03:13,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-20 06:03:13,377 INFO L87 Difference]: Start difference. First operand 216 states and 237 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) [2022-07-20 06:03:13,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:03:13,639 INFO L93 Difference]: Finished difference Result 214 states and 235 transitions. [2022-07-20 06:03:13,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-20 06:03:13,640 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 [2022-07-20 06:03:13,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:03:13,642 INFO L225 Difference]: With dead ends: 214 [2022-07-20 06:03:13,642 INFO L226 Difference]: Without dead ends: 214 [2022-07-20 06:03:13,643 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-20 06:03:13,644 INFO L413 NwaCegarLoop]: 223 mSDtfsCounter, 17 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 361 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-20 06:03:13,644 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 361 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-20 06:03:13,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2022-07-20 06:03:13,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 214. [2022-07-20 06:03:13,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 113 states have (on average 1.8495575221238938) internal successors, (209), 200 states have internal predecessors, (209), 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) [2022-07-20 06:03:13,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 235 transitions. [2022-07-20 06:03:13,678 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 235 transitions. Word has length 6 [2022-07-20 06:03:13,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:03:13,678 INFO L495 AbstractCegarLoop]: Abstraction has 214 states and 235 transitions. [2022-07-20 06:03:13,678 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) [2022-07-20 06:03:13,679 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 235 transitions. [2022-07-20 06:03:13,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-07-20 06:03:13,679 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:03:13,679 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-07-20 06:03:13,695 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2022-07-20 06:03:13,888 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-20 06:03:13,889 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)] === [2022-07-20 06:03:13,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:03:13,889 INFO L85 PathProgramCache]: Analyzing trace with hash 1692065586, now seen corresponding path program 1 times [2022-07-20 06:03:13,890 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-20 06:03:13,890 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [616150472] [2022-07-20 06:03:13,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:13,890 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-20 06:03:13,891 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-20 06:03:13,892 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-20 06:03:13,895 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2022-07-20 06:03:13,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:13,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 4 conjunts are in the unsatisfiable core [2022-07-20 06:03:13,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:03:13,992 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-20 06:03:14,010 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:03:14,010 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-20 06:03:14,013 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-20 06:03:14,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [616150472] [2022-07-20 06:03:14,013 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [616150472] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 06:03:14,014 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 06:03:14,014 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-20 06:03:14,014 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189192860] [2022-07-20 06:03:14,015 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 06:03:14,015 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-20 06:03:14,015 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-20 06:03:14,016 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-20 06:03:14,016 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-20 06:03:14,016 INFO L87 Difference]: Start difference. First operand 214 states and 235 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) [2022-07-20 06:03:14,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:03:14,341 INFO L93 Difference]: Finished difference Result 212 states and 233 transitions. [2022-07-20 06:03:14,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-20 06:03:14,343 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 [2022-07-20 06:03:14,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:03:14,344 INFO L225 Difference]: With dead ends: 212 [2022-07-20 06:03:14,344 INFO L226 Difference]: Without dead ends: 212 [2022-07-20 06:03:14,345 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-20 06:03:14,345 INFO L413 NwaCegarLoop]: 223 mSDtfsCounter, 15 mSDsluCounter, 143 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 366 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-20 06:03:14,346 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 366 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-07-20 06:03:14,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2022-07-20 06:03:14,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 212. [2022-07-20 06:03:14,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 113 states have (on average 1.831858407079646) internal successors, (207), 198 states have internal predecessors, (207), 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) [2022-07-20 06:03:14,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 233 transitions. [2022-07-20 06:03:14,376 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 233 transitions. Word has length 6 [2022-07-20 06:03:14,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:03:14,376 INFO L495 AbstractCegarLoop]: Abstraction has 212 states and 233 transitions. [2022-07-20 06:03:14,377 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) [2022-07-20 06:03:14,377 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 233 transitions. [2022-07-20 06:03:14,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-07-20 06:03:14,378 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:03:14,378 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 06:03:14,390 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2022-07-20 06:03:14,587 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-20 06:03:14,587 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)] === [2022-07-20 06:03:14,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:03:14,588 INFO L85 PathProgramCache]: Analyzing trace with hash -1321164331, now seen corresponding path program 1 times [2022-07-20 06:03:14,588 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-20 06:03:14,589 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1176406961] [2022-07-20 06:03:14,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:14,589 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-20 06:03:14,589 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-20 06:03:14,591 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-20 06:03:14,597 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2022-07-20 06:03:14,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:14,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 9 conjunts are in the unsatisfiable core [2022-07-20 06:03:14,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:03:14,723 INFO L356 Elim1Store]: treesize reduction 27, result has 50.9 percent of original size [2022-07-20 06:03:14,725 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 12 treesize of output 33 [2022-07-20 06:03:14,818 INFO L356 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-07-20 06:03:14,821 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 27 [2022-07-20 06:03:14,936 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:03:14,936 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-20 06:03:14,937 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-20 06:03:14,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1176406961] [2022-07-20 06:03:14,937 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1176406961] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 06:03:14,937 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 06:03:14,937 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-07-20 06:03:14,937 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811897549] [2022-07-20 06:03:14,938 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 06:03:14,938 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-07-20 06:03:14,939 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-20 06:03:14,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-07-20 06:03:14,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-07-20 06:03:14,940 INFO L87 Difference]: Start difference. First operand 212 states and 233 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) [2022-07-20 06:03:15,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:03:15,252 INFO L93 Difference]: Finished difference Result 222 states and 247 transitions. [2022-07-20 06:03:15,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-20 06:03:15,253 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 [2022-07-20 06:03:15,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:03:15,256 INFO L225 Difference]: With dead ends: 222 [2022-07-20 06:03:15,256 INFO L226 Difference]: Without dead ends: 222 [2022-07-20 06:03:15,256 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-07-20 06:03:15,257 INFO L413 NwaCegarLoop]: 226 mSDtfsCounter, 9 mSDsluCounter, 433 mSDsCounter, 0 mSdLazyCounter, 172 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 659 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 89 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-20 06:03:15,257 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 659 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 172 Invalid, 0 Unknown, 89 Unchecked, 0.3s Time] [2022-07-20 06:03:15,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2022-07-20 06:03:15,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 222. [2022-07-20 06:03:15,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 222 states, 120 states have (on average 1.7916666666666667) internal successors, (215), 207 states have internal predecessors, (215), 20 states have call successors, (20), 5 states have call predecessors, (20), 3 states have return successors, (12), 9 states have call predecessors, (12), 12 states have call successors, (12) [2022-07-20 06:03:15,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 247 transitions. [2022-07-20 06:03:15,279 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 247 transitions. Word has length 10 [2022-07-20 06:03:15,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:03:15,283 INFO L495 AbstractCegarLoop]: Abstraction has 222 states and 247 transitions. [2022-07-20 06:03:15,283 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) [2022-07-20 06:03:15,283 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 247 transitions. [2022-07-20 06:03:15,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-07-20 06:03:15,284 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:03:15,284 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 06:03:15,298 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2022-07-20 06:03:15,493 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-20 06:03:15,494 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)] === [2022-07-20 06:03:15,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:03:15,495 INFO L85 PathProgramCache]: Analyzing trace with hash -1321164330, now seen corresponding path program 1 times [2022-07-20 06:03:15,495 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-20 06:03:15,495 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1195835975] [2022-07-20 06:03:15,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:15,496 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-20 06:03:15,496 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-20 06:03:15,497 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-20 06:03:15,501 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2022-07-20 06:03:15,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:15,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 16 conjunts are in the unsatisfiable core [2022-07-20 06:03:15,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:03:15,643 INFO L356 Elim1Store]: treesize reduction 33, result has 40.0 percent of original size [2022-07-20 06:03:15,643 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 12 treesize of output 27 [2022-07-20 06:03:15,693 INFO L356 Elim1Store]: treesize reduction 27, result has 50.9 percent of original size [2022-07-20 06:03:15,693 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 12 treesize of output 33 [2022-07-20 06:03:15,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:03:15,780 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-20 06:03:15,790 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-20 06:03:15,790 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2022-07-20 06:03:15,845 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:03:15,845 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-20 06:03:15,845 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-20 06:03:15,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1195835975] [2022-07-20 06:03:15,846 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1195835975] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 06:03:15,846 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 06:03:15,846 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-07-20 06:03:15,846 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407010538] [2022-07-20 06:03:15,846 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 06:03:15,847 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-07-20 06:03:15,847 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-20 06:03:15,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-07-20 06:03:15,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-07-20 06:03:15,848 INFO L87 Difference]: Start difference. First operand 222 states and 247 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) [2022-07-20 06:03:16,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:03:16,381 INFO L93 Difference]: Finished difference Result 214 states and 238 transitions. [2022-07-20 06:03:16,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-07-20 06:03:16,382 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 [2022-07-20 06:03:16,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:03:16,383 INFO L225 Difference]: With dead ends: 214 [2022-07-20 06:03:16,384 INFO L226 Difference]: Without dead ends: 214 [2022-07-20 06:03:16,384 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-07-20 06:03:16,384 INFO L413 NwaCegarLoop]: 202 mSDtfsCounter, 40 mSDsluCounter, 333 mSDsCounter, 0 mSdLazyCounter, 311 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 535 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 311 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-07-20 06:03:16,385 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 535 Invalid, 324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 311 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-07-20 06:03:16,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2022-07-20 06:03:16,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 214. [2022-07-20 06:03:16,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 120 states have (on average 1.7166666666666666) internal successors, (206), 199 states have internal predecessors, (206), 20 states have call successors, (20), 5 states have call predecessors, (20), 3 states have return successors, (12), 9 states have call predecessors, (12), 12 states have call successors, (12) [2022-07-20 06:03:16,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 238 transitions. [2022-07-20 06:03:16,410 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 238 transitions. Word has length 10 [2022-07-20 06:03:16,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:03:16,410 INFO L495 AbstractCegarLoop]: Abstraction has 214 states and 238 transitions. [2022-07-20 06:03:16,411 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) [2022-07-20 06:03:16,411 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 238 transitions. [2022-07-20 06:03:16,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-07-20 06:03:16,411 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:03:16,412 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 06:03:16,422 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2022-07-20 06:03:16,619 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-20 06:03:16,620 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)] === [2022-07-20 06:03:16,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:03:16,620 INFO L85 PathProgramCache]: Analyzing trace with hash 1993578833, now seen corresponding path program 1 times [2022-07-20 06:03:16,622 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-20 06:03:16,622 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [732102176] [2022-07-20 06:03:16,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:16,622 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-20 06:03:16,622 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-20 06:03:16,624 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-20 06:03:16,626 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2022-07-20 06:03:16,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:16,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 5 conjunts are in the unsatisfiable core [2022-07-20 06:03:16,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:03:16,716 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-20 06:03:16,743 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:03:16,743 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-20 06:03:16,743 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-20 06:03:16,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [732102176] [2022-07-20 06:03:16,744 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [732102176] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 06:03:16,744 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 06:03:16,744 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-07-20 06:03:16,744 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1448638396] [2022-07-20 06:03:16,744 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 06:03:16,745 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-07-20 06:03:16,745 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-20 06:03:16,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-07-20 06:03:16,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-07-20 06:03:16,746 INFO L87 Difference]: Start difference. First operand 214 states and 238 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) [2022-07-20 06:03:17,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:03:17,098 INFO L93 Difference]: Finished difference Result 213 states and 237 transitions. [2022-07-20 06:03:17,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-07-20 06:03:17,098 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 [2022-07-20 06:03:17,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:03:17,100 INFO L225 Difference]: With dead ends: 213 [2022-07-20 06:03:17,100 INFO L226 Difference]: Without dead ends: 213 [2022-07-20 06:03:17,100 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-07-20 06:03:17,101 INFO L413 NwaCegarLoop]: 213 mSDtfsCounter, 26 mSDsluCounter, 405 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 618 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-20 06:03:17,101 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 618 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 245 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-07-20 06:03:17,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2022-07-20 06:03:17,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 213. [2022-07-20 06:03:17,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213 states, 120 states have (on average 1.7083333333333333) internal successors, (205), 198 states have internal predecessors, (205), 20 states have call successors, (20), 5 states have call predecessors, (20), 3 states have return successors, (12), 9 states have call predecessors, (12), 12 states have call successors, (12) [2022-07-20 06:03:17,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 237 transitions. [2022-07-20 06:03:17,109 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 237 transitions. Word has length 11 [2022-07-20 06:03:17,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:03:17,110 INFO L495 AbstractCegarLoop]: Abstraction has 213 states and 237 transitions. [2022-07-20 06:03:17,110 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) [2022-07-20 06:03:17,110 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 237 transitions. [2022-07-20 06:03:17,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-07-20 06:03:17,111 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:03:17,111 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 06:03:17,124 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2022-07-20 06:03:17,321 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-20 06:03:17,322 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)] === [2022-07-20 06:03:17,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:03:17,322 INFO L85 PathProgramCache]: Analyzing trace with hash 1993578834, now seen corresponding path program 1 times [2022-07-20 06:03:17,323 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-20 06:03:17,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [214052976] [2022-07-20 06:03:17,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:17,323 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-20 06:03:17,323 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-20 06:03:17,324 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-20 06:03:17,326 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2022-07-20 06:03:17,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:17,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 8 conjunts are in the unsatisfiable core [2022-07-20 06:03:17,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:03:17,420 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-20 06:03:17,482 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:03:17,482 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-20 06:03:17,483 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-20 06:03:17,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [214052976] [2022-07-20 06:03:17,485 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [214052976] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 06:03:17,485 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 06:03:17,485 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-07-20 06:03:17,485 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001600399] [2022-07-20 06:03:17,485 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 06:03:17,486 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-07-20 06:03:17,486 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-20 06:03:17,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-07-20 06:03:17,487 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-07-20 06:03:17,488 INFO L87 Difference]: Start difference. First operand 213 states and 237 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) [2022-07-20 06:03:17,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:03:17,921 INFO L93 Difference]: Finished difference Result 212 states and 236 transitions. [2022-07-20 06:03:17,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-07-20 06:03:17,922 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 [2022-07-20 06:03:17,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:03:17,923 INFO L225 Difference]: With dead ends: 212 [2022-07-20 06:03:17,923 INFO L226 Difference]: Without dead ends: 212 [2022-07-20 06:03:17,924 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-07-20 06:03:17,924 INFO L413 NwaCegarLoop]: 215 mSDtfsCounter, 23 mSDsluCounter, 420 mSDsCounter, 0 mSdLazyCounter, 227 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 635 SdHoareTripleChecker+Invalid, 227 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-07-20 06:03:17,925 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 635 Invalid, 227 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 227 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-07-20 06:03:17,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2022-07-20 06:03:17,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 212. [2022-07-20 06:03:17,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 120 states have (on average 1.7) internal successors, (204), 197 states have internal predecessors, (204), 20 states have call successors, (20), 5 states have call predecessors, (20), 3 states have return successors, (12), 9 states have call predecessors, (12), 12 states have call successors, (12) [2022-07-20 06:03:17,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 236 transitions. [2022-07-20 06:03:17,932 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 236 transitions. Word has length 11 [2022-07-20 06:03:17,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:03:17,933 INFO L495 AbstractCegarLoop]: Abstraction has 212 states and 236 transitions. [2022-07-20 06:03:17,933 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) [2022-07-20 06:03:17,933 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 236 transitions. [2022-07-20 06:03:17,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-07-20 06:03:17,934 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:03:17,934 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 06:03:17,943 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Ended with exit code 0 [2022-07-20 06:03:18,139 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-20 06:03:18,140 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting chain_nodeErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-07-20 06:03:18,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:03:18,140 INFO L85 PathProgramCache]: Analyzing trace with hash 273848882, now seen corresponding path program 1 times [2022-07-20 06:03:18,140 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-20 06:03:18,141 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [820174245] [2022-07-20 06:03:18,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:18,141 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-20 06:03:18,141 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-20 06:03:18,142 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-20 06:03:18,144 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2022-07-20 06:03:18,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:18,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 2 conjunts are in the unsatisfiable core [2022-07-20 06:03:18,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:03:18,240 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:03:18,241 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-20 06:03:18,241 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-20 06:03:18,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [820174245] [2022-07-20 06:03:18,241 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [820174245] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 06:03:18,241 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 06:03:18,241 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-20 06:03:18,242 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548182468] [2022-07-20 06:03:18,242 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 06:03:18,242 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-20 06:03:18,242 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-20 06:03:18,243 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-20 06:03:18,243 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-20 06:03:18,243 INFO L87 Difference]: Start difference. First operand 212 states and 236 transitions. Second operand has 3 states, 2 states have (on average 6.0) internal successors, (12), 3 states have internal predecessors, (12), 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) [2022-07-20 06:03:18,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:03:18,421 INFO L93 Difference]: Finished difference Result 211 states and 235 transitions. [2022-07-20 06:03:18,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-20 06:03:18,422 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 6.0) internal successors, (12), 3 states have internal predecessors, (12), 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 13 [2022-07-20 06:03:18,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:03:18,423 INFO L225 Difference]: With dead ends: 211 [2022-07-20 06:03:18,423 INFO L226 Difference]: Without dead ends: 211 [2022-07-20 06:03:18,423 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-20 06:03:18,424 INFO L413 NwaCegarLoop]: 220 mSDtfsCounter, 2 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 358 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-20 06:03:18,424 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 358 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-20 06:03:18,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2022-07-20 06:03:18,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 211. [2022-07-20 06:03:18,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 120 states have (on average 1.6916666666666667) internal successors, (203), 196 states have internal predecessors, (203), 20 states have call successors, (20), 5 states have call predecessors, (20), 3 states have return successors, (12), 9 states have call predecessors, (12), 12 states have call successors, (12) [2022-07-20 06:03:18,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 235 transitions. [2022-07-20 06:03:18,430 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 235 transitions. Word has length 13 [2022-07-20 06:03:18,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:03:18,430 INFO L495 AbstractCegarLoop]: Abstraction has 211 states and 235 transitions. [2022-07-20 06:03:18,430 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 6.0) internal successors, (12), 3 states have internal predecessors, (12), 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) [2022-07-20 06:03:18,430 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 235 transitions. [2022-07-20 06:03:18,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-07-20 06:03:18,431 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:03:18,431 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 06:03:18,445 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2022-07-20 06:03:18,642 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-20 06:03:18,643 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-07-20 06:03:18,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:03:18,643 INFO L85 PathProgramCache]: Analyzing trace with hash 2066019085, now seen corresponding path program 1 times [2022-07-20 06:03:18,643 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-20 06:03:18,644 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1075454049] [2022-07-20 06:03:18,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:18,644 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-20 06:03:18,644 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-20 06:03:18,645 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-20 06:03:18,646 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2022-07-20 06:03:18,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:18,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 15 conjunts are in the unsatisfiable core [2022-07-20 06:03:18,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:03:18,789 INFO L356 Elim1Store]: treesize reduction 30, result has 45.5 percent of original size [2022-07-20 06:03:18,790 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 12 treesize of output 30 [2022-07-20 06:03:18,925 INFO L356 Elim1Store]: treesize reduction 8, result has 60.0 percent of original size [2022-07-20 06:03:18,925 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 1 case distinctions, treesize of input 19 treesize of output 28 [2022-07-20 06:03:18,981 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:03:18,981 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-20 06:03:18,981 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-20 06:03:18,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1075454049] [2022-07-20 06:03:18,982 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1075454049] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 06:03:18,982 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 06:03:18,982 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-07-20 06:03:18,982 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748098622] [2022-07-20 06:03:18,982 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 06:03:18,982 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-07-20 06:03:18,982 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-20 06:03:18,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-07-20 06:03:18,983 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-07-20 06:03:18,983 INFO L87 Difference]: Start difference. First operand 211 states and 235 transitions. Second operand has 7 states, 5 states have (on average 3.2) internal successors, (16), 6 states have internal predecessors, (16), 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) [2022-07-20 06:03:19,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:03:19,402 INFO L93 Difference]: Finished difference Result 210 states and 234 transitions. [2022-07-20 06:03:19,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-20 06:03:19,403 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 3.2) internal successors, (16), 6 states have internal predecessors, (16), 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 18 [2022-07-20 06:03:19,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:03:19,404 INFO L225 Difference]: With dead ends: 210 [2022-07-20 06:03:19,404 INFO L226 Difference]: Without dead ends: 210 [2022-07-20 06:03:19,405 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-07-20 06:03:19,405 INFO L413 NwaCegarLoop]: 200 mSDtfsCounter, 49 mSDsluCounter, 411 mSDsCounter, 0 mSdLazyCounter, 320 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 611 SdHoareTripleChecker+Invalid, 611 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 320 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 273 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-07-20 06:03:19,405 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 611 Invalid, 611 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 320 Invalid, 0 Unknown, 273 Unchecked, 0.4s Time] [2022-07-20 06:03:19,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2022-07-20 06:03:19,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 210. [2022-07-20 06:03:19,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 120 states have (on average 1.6833333333333333) internal successors, (202), 195 states have internal predecessors, (202), 20 states have call successors, (20), 5 states have call predecessors, (20), 3 states have return successors, (12), 9 states have call predecessors, (12), 12 states have call successors, (12) [2022-07-20 06:03:19,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 234 transitions. [2022-07-20 06:03:19,413 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 234 transitions. Word has length 18 [2022-07-20 06:03:19,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:03:19,415 INFO L495 AbstractCegarLoop]: Abstraction has 210 states and 234 transitions. [2022-07-20 06:03:19,415 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 3.2) internal successors, (16), 6 states have internal predecessors, (16), 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) [2022-07-20 06:03:19,415 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 234 transitions. [2022-07-20 06:03:19,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-07-20 06:03:19,416 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:03:19,417 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 06:03:19,429 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2022-07-20 06:03:19,627 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-20 06:03:19,627 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-07-20 06:03:19,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:03:19,627 INFO L85 PathProgramCache]: Analyzing trace with hash 2066019086, now seen corresponding path program 1 times [2022-07-20 06:03:19,628 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-20 06:03:19,628 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2010572944] [2022-07-20 06:03:19,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:19,628 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-20 06:03:19,628 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-20 06:03:19,630 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-20 06:03:19,631 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2022-07-20 06:03:19,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:19,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 18 conjunts are in the unsatisfiable core [2022-07-20 06:03:19,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:03:19,765 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:03:19,766 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:03:19,783 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-07-20 06:03:19,784 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 20 [2022-07-20 06:03:19,792 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2022-07-20 06:03:19,886 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-07-20 06:03:19,886 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 1 case distinctions, treesize of input 12 treesize of output 18 [2022-07-20 06:03:19,944 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:03:19,944 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-20 06:03:19,945 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-20 06:03:19,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2010572944] [2022-07-20 06:03:19,945 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2010572944] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 06:03:19,945 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 06:03:19,945 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-07-20 06:03:19,945 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834318679] [2022-07-20 06:03:19,945 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 06:03:19,946 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-07-20 06:03:19,946 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-20 06:03:19,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-07-20 06:03:19,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-07-20 06:03:19,947 INFO L87 Difference]: Start difference. First operand 210 states and 234 transitions. Second operand has 6 states, 4 states have (on average 4.0) internal successors, (16), 5 states have internal predecessors, (16), 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) [2022-07-20 06:03:20,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:03:20,314 INFO L93 Difference]: Finished difference Result 227 states and 252 transitions. [2022-07-20 06:03:20,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-20 06:03:20,315 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 4.0) internal successors, (16), 5 states have internal predecessors, (16), 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 18 [2022-07-20 06:03:20,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:03:20,317 INFO L225 Difference]: With dead ends: 227 [2022-07-20 06:03:20,317 INFO L226 Difference]: Without dead ends: 227 [2022-07-20 06:03:20,317 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-07-20 06:03:20,317 INFO L413 NwaCegarLoop]: 208 mSDtfsCounter, 45 mSDsluCounter, 377 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 585 SdHoareTripleChecker+Invalid, 463 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 261 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-07-20 06:03:20,318 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 585 Invalid, 463 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 186 Invalid, 0 Unknown, 261 Unchecked, 0.4s Time] [2022-07-20 06:03:20,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2022-07-20 06:03:20,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 225. [2022-07-20 06:03:20,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 134 states have (on average 1.626865671641791) internal successors, (218), 208 states have internal predecessors, (218), 20 states have call successors, (20), 6 states have call predecessors, (20), 4 states have return successors, (12), 10 states have call predecessors, (12), 12 states have call successors, (12) [2022-07-20 06:03:20,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 250 transitions. [2022-07-20 06:03:20,325 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 250 transitions. Word has length 18 [2022-07-20 06:03:20,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:03:20,325 INFO L495 AbstractCegarLoop]: Abstraction has 225 states and 250 transitions. [2022-07-20 06:03:20,325 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 4.0) internal successors, (16), 5 states have internal predecessors, (16), 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) [2022-07-20 06:03:20,325 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 250 transitions. [2022-07-20 06:03:20,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-07-20 06:03:20,326 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:03:20,326 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 06:03:20,335 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2022-07-20 06:03:20,535 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-20 06:03:20,535 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting chain_nodeErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-07-20 06:03:20,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:03:20,536 INFO L85 PathProgramCache]: Analyzing trace with hash 823372381, now seen corresponding path program 1 times [2022-07-20 06:03:20,536 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-20 06:03:20,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [24903056] [2022-07-20 06:03:20,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:20,536 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-20 06:03:20,536 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-20 06:03:20,537 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-20 06:03:20,538 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2022-07-20 06:03:20,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:20,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 11 conjunts are in the unsatisfiable core [2022-07-20 06:03:20,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:03:20,696 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-20 06:03:20,744 INFO L356 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2022-07-20 06:03:20,744 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 1 case distinctions, treesize of input 12 treesize of output 17 [2022-07-20 06:03:20,768 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:03:20,769 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 06:03:20,904 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:03:20,904 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-20 06:03:20,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [24903056] [2022-07-20 06:03:20,904 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [24903056] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-20 06:03:20,904 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-20 06:03:20,904 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2022-07-20 06:03:20,904 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155817423] [2022-07-20 06:03:20,904 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-20 06:03:20,905 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-07-20 06:03:20,905 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-20 06:03:20,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-07-20 06:03:20,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-07-20 06:03:20,906 INFO L87 Difference]: Start difference. First operand 225 states and 250 transitions. Second operand has 7 states, 6 states have (on average 5.166666666666667) internal successors, (31), 7 states have internal predecessors, (31), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-20 06:03:21,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:03:21,347 INFO L93 Difference]: Finished difference Result 224 states and 248 transitions. [2022-07-20 06:03:21,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-07-20 06:03:21,348 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 5.166666666666667) internal successors, (31), 7 states have internal predecessors, (31), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2022-07-20 06:03:21,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:03:21,349 INFO L225 Difference]: With dead ends: 224 [2022-07-20 06:03:21,349 INFO L226 Difference]: Without dead ends: 224 [2022-07-20 06:03:21,349 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2022-07-20 06:03:21,350 INFO L413 NwaCegarLoop]: 204 mSDtfsCounter, 30 mSDsluCounter, 719 mSDsCounter, 0 mSdLazyCounter, 327 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 923 SdHoareTripleChecker+Invalid, 334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-07-20 06:03:21,350 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 923 Invalid, 334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 327 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-07-20 06:03:21,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2022-07-20 06:03:21,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 215. [2022-07-20 06:03:21,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 127 states have (on average 1.6456692913385826) internal successors, (209), 199 states have internal predecessors, (209), 18 states have call successors, (18), 5 states have call predecessors, (18), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-07-20 06:03:21,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 237 transitions. [2022-07-20 06:03:21,356 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 237 transitions. Word has length 24 [2022-07-20 06:03:21,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:03:21,356 INFO L495 AbstractCegarLoop]: Abstraction has 215 states and 237 transitions. [2022-07-20 06:03:21,356 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 5.166666666666667) internal successors, (31), 7 states have internal predecessors, (31), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-20 06:03:21,356 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 237 transitions. [2022-07-20 06:03:21,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-07-20 06:03:21,357 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:03:21,357 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-07-20 06:03:21,369 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2022-07-20 06:03:21,569 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-20 06:03:21,569 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-07-20 06:03:21,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:03:21,569 INFO L85 PathProgramCache]: Analyzing trace with hash 1607136150, now seen corresponding path program 1 times [2022-07-20 06:03:21,570 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-20 06:03:21,570 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [919059832] [2022-07-20 06:03:21,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:21,570 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-20 06:03:21,570 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-20 06:03:21,571 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-20 06:03:21,572 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2022-07-20 06:03:21,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:21,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 19 conjunts are in the unsatisfiable core [2022-07-20 06:03:21,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:03:21,795 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:03:21,821 INFO L356 Elim1Store]: treesize reduction 24, result has 33.3 percent of original size [2022-07-20 06:03:21,822 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 23 [2022-07-20 06:03:21,832 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 38 [2022-07-20 06:03:21,865 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-20 06:03:22,012 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:03:22,014 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-20 06:03:22,152 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-07-20 06:03:22,152 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 1 case distinctions, treesize of input 12 treesize of output 18 [2022-07-20 06:03:22,244 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:03:22,245 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 06:03:22,444 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-20 06:03:22,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [919059832] [2022-07-20 06:03:22,445 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [919059832] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-20 06:03:22,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [633623629] [2022-07-20 06:03:22,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:22,445 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-20 06:03:22,445 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-20 06:03:22,448 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-07-20 06:03:22,450 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (14)] Waiting until timeout for monitored process [2022-07-20 06:03:22,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:22,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 19 conjunts are in the unsatisfiable core [2022-07-20 06:03:22,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:03:22,809 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:03:22,834 INFO L356 Elim1Store]: treesize reduction 24, result has 33.3 percent of original size [2022-07-20 06:03:22,834 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 23 [2022-07-20 06:03:22,843 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 37 [2022-07-20 06:03:22,866 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-20 06:03:22,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:03:22,994 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-20 06:03:23,050 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-20 06:03:23,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:03:23,215 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-20 06:03:23,247 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-07-20 06:03:23,247 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 06:03:23,410 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [633623629] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-20 06:03:23,410 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-20 06:03:23,410 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 10 [2022-07-20 06:03:23,410 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114301222] [2022-07-20 06:03:23,411 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-20 06:03:23,411 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-07-20 06:03:23,411 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-20 06:03:23,411 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-07-20 06:03:23,412 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2022-07-20 06:03:23,412 INFO L87 Difference]: Start difference. First operand 215 states and 237 transitions. Second operand has 11 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-07-20 06:03:23,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:03:23,982 INFO L93 Difference]: Finished difference Result 230 states and 254 transitions. [2022-07-20 06:03:23,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-07-20 06:03:23,983 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 32 [2022-07-20 06:03:23,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:03:23,984 INFO L225 Difference]: With dead ends: 230 [2022-07-20 06:03:23,984 INFO L226 Difference]: Without dead ends: 230 [2022-07-20 06:03:23,984 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2022-07-20 06:03:23,985 INFO L413 NwaCegarLoop]: 208 mSDtfsCounter, 57 mSDsluCounter, 539 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 747 SdHoareTripleChecker+Invalid, 798 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 525 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-07-20 06:03:23,985 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [57 Valid, 747 Invalid, 798 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 254 Invalid, 0 Unknown, 525 Unchecked, 0.5s Time] [2022-07-20 06:03:23,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2022-07-20 06:03:23,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 224. [2022-07-20 06:03:23,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 135 states have (on average 1.5925925925925926) internal successors, (215), 208 states have internal predecessors, (215), 19 states have call successors, (19), 6 states have call predecessors, (19), 5 states have return successors, (11), 9 states have call predecessors, (11), 11 states have call successors, (11) [2022-07-20 06:03:23,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 245 transitions. [2022-07-20 06:03:23,991 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 245 transitions. Word has length 32 [2022-07-20 06:03:23,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:03:23,994 INFO L495 AbstractCegarLoop]: Abstraction has 224 states and 245 transitions. [2022-07-20 06:03:23,994 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-07-20 06:03:23,994 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 245 transitions. [2022-07-20 06:03:24,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-07-20 06:03:24,001 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:03:24,001 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] [2022-07-20 06:03:24,007 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (14)] Forceful destruction successful, exit code 0 [2022-07-20 06:03:24,219 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2022-07-20 06:03:24,417 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-20 06:03:24,417 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-07-20 06:03:24,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:03:24,417 INFO L85 PathProgramCache]: Analyzing trace with hash 230094096, now seen corresponding path program 1 times [2022-07-20 06:03:24,418 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-20 06:03:24,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1239017977] [2022-07-20 06:03:24,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:24,418 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-20 06:03:24,418 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-20 06:03:24,420 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-20 06:03:24,422 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2022-07-20 06:03:24,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:24,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 22 conjunts are in the unsatisfiable core [2022-07-20 06:03:24,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:03:24,667 INFO L356 Elim1Store]: treesize reduction 30, result has 45.5 percent of original size [2022-07-20 06:03:24,667 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 37 [2022-07-20 06:03:24,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:03:24,814 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 21 [2022-07-20 06:03:25,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:03:25,142 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 21 [2022-07-20 06:03:25,210 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:03:25,210 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-20 06:03:25,210 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-20 06:03:25,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1239017977] [2022-07-20 06:03:25,210 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1239017977] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 06:03:25,210 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 06:03:25,210 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-07-20 06:03:25,210 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933869914] [2022-07-20 06:03:25,211 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 06:03:25,211 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-20 06:03:25,211 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-20 06:03:25,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-20 06:03:25,211 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2022-07-20 06:03:25,212 INFO L87 Difference]: Start difference. First operand 224 states and 245 transitions. Second operand has 10 states, 8 states have (on average 3.875) internal successors, (31), 8 states have internal predecessors, (31), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-20 06:03:25,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:03:25,539 INFO L93 Difference]: Finished difference Result 240 states and 263 transitions. [2022-07-20 06:03:25,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-07-20 06:03:25,540 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 3.875) internal successors, (31), 8 states have internal predecessors, (31), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 35 [2022-07-20 06:03:25,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:03:25,541 INFO L225 Difference]: With dead ends: 240 [2022-07-20 06:03:25,541 INFO L226 Difference]: Without dead ends: 240 [2022-07-20 06:03:25,542 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2022-07-20 06:03:25,542 INFO L413 NwaCegarLoop]: 215 mSDtfsCounter, 7 mSDsluCounter, 639 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 854 SdHoareTripleChecker+Invalid, 679 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 475 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-20 06:03:25,542 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 854 Invalid, 679 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 203 Invalid, 0 Unknown, 475 Unchecked, 0.3s Time] [2022-07-20 06:03:25,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2022-07-20 06:03:25,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 226. [2022-07-20 06:03:25,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 138 states have (on average 1.5942028985507246) internal successors, (220), 209 states have internal predecessors, (220), 18 states have call successors, (18), 6 states have call predecessors, (18), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-07-20 06:03:25,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 248 transitions. [2022-07-20 06:03:25,549 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 248 transitions. Word has length 35 [2022-07-20 06:03:25,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:03:25,551 INFO L495 AbstractCegarLoop]: Abstraction has 226 states and 248 transitions. [2022-07-20 06:03:25,552 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 3.875) internal successors, (31), 8 states have internal predecessors, (31), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-20 06:03:25,552 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 248 transitions. [2022-07-20 06:03:25,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-07-20 06:03:25,554 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:03:25,554 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] [2022-07-20 06:03:25,572 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2022-07-20 06:03:25,759 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-20 06:03:25,760 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-07-20 06:03:25,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:03:25,760 INFO L85 PathProgramCache]: Analyzing trace with hash 230094097, now seen corresponding path program 1 times [2022-07-20 06:03:25,760 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-20 06:03:25,761 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [598678239] [2022-07-20 06:03:25,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:25,761 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-20 06:03:25,761 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-20 06:03:25,762 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-20 06:03:25,763 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2022-07-20 06:03:25,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:25,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 28 conjunts are in the unsatisfiable core [2022-07-20 06:03:25,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:03:25,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:03:26,026 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-07-20 06:03:26,027 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 12 treesize of output 20 [2022-07-20 06:03:26,034 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-07-20 06:03:26,068 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-07-20 06:03:26,069 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 7 [2022-07-20 06:03:26,194 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:03:26,212 INFO L356 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-07-20 06:03:26,212 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 26 [2022-07-20 06:03:26,330 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-20 06:03:26,500 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:03:26,501 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-20 06:03:26,574 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:03:26,574 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-20 06:03:26,574 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-20 06:03:26,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [598678239] [2022-07-20 06:03:26,574 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [598678239] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 06:03:26,574 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 06:03:26,575 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-07-20 06:03:26,575 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869399917] [2022-07-20 06:03:26,575 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 06:03:26,575 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-07-20 06:03:26,575 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-20 06:03:26,575 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-07-20 06:03:26,576 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2022-07-20 06:03:26,576 INFO L87 Difference]: Start difference. First operand 226 states and 248 transitions. Second operand has 9 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-20 06:03:27,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:03:27,112 INFO L93 Difference]: Finished difference Result 261 states and 287 transitions. [2022-07-20 06:03:27,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-20 06:03:27,112 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 35 [2022-07-20 06:03:27,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:03:27,114 INFO L225 Difference]: With dead ends: 261 [2022-07-20 06:03:27,114 INFO L226 Difference]: Without dead ends: 261 [2022-07-20 06:03:27,114 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2022-07-20 06:03:27,115 INFO L413 NwaCegarLoop]: 217 mSDtfsCounter, 2 mSDsluCounter, 647 mSDsCounter, 0 mSdLazyCounter, 273 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 864 SdHoareTripleChecker+Invalid, 483 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 208 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-07-20 06:03:27,115 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 864 Invalid, 483 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 273 Invalid, 0 Unknown, 208 Unchecked, 0.5s Time] [2022-07-20 06:03:27,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2022-07-20 06:03:27,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 260. [2022-07-20 06:03:27,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 260 states, 167 states have (on average 1.5029940119760479) internal successors, (251), 239 states have internal predecessors, (251), 21 states have call successors, (21), 8 states have call predecessors, (21), 7 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2022-07-20 06:03:27,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 285 transitions. [2022-07-20 06:03:27,122 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 285 transitions. Word has length 35 [2022-07-20 06:03:27,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:03:27,123 INFO L495 AbstractCegarLoop]: Abstraction has 260 states and 285 transitions. [2022-07-20 06:03:27,123 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-20 06:03:27,123 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 285 transitions. [2022-07-20 06:03:27,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-07-20 06:03:27,124 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:03:27,124 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 06:03:27,139 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2022-07-20 06:03:27,336 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-20 06:03:27,336 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-07-20 06:03:27,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:03:27,337 INFO L85 PathProgramCache]: Analyzing trace with hash -304151576, now seen corresponding path program 1 times [2022-07-20 06:03:27,337 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-20 06:03:27,337 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1960235683] [2022-07-20 06:03:27,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:03:27,338 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-20 06:03:27,338 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-20 06:03:27,339 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-20 06:03:27,340 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2022-07-20 06:03:27,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:03:27,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 29 conjunts are in the unsatisfiable core [2022-07-20 06:03:27,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:03:27,643 INFO L356 Elim1Store]: treesize reduction 30, result has 45.5 percent of original size [2022-07-20 06:03:27,644 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 37 [2022-07-20 06:03:27,694 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-20 06:03:27,695 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 35 [2022-07-20 06:03:27,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:03:27,843 INFO L356 Elim1Store]: treesize reduction 16, result has 42.9 percent of original size [2022-07-20 06:03:27,843 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 37 treesize of output 49 [2022-07-20 06:03:28,827 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-20 06:03:28,827 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 44 treesize of output 60 [2022-07-20 06:03:30,929 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:03:30,991 INFO L356 Elim1Store]: treesize reduction 27, result has 57.1 percent of original size [2022-07-20 06:03:30,991 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 50 treesize of output 81 [2022-07-20 06:03:55,127 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-20 06:03:55,128 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 44 treesize of output 60 [2022-07-20 06:03:55,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:03:55,955 INFO L356 Elim1Store]: treesize reduction 27, result has 57.1 percent of original size [2022-07-20 06:03:55,956 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 50 treesize of output 81 [2022-07-20 06:05:33,678 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 24 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-07-20 06:05:33,678 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 06:05:33,771 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-20 06:05:33,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1960235683] [2022-07-20 06:05:33,771 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1960235683] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-20 06:05:33,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1358660792] [2022-07-20 06:05:33,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:05:33,772 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-20 06:05:33,772 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-20 06:05:33,773 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-07-20 06:05:33,774 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2022-07-20 06:05:34,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:05:34,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 24 conjunts are in the unsatisfiable core [2022-07-20 06:05:34,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:05:34,297 INFO L356 Elim1Store]: treesize reduction 76, result has 35.0 percent of original size [2022-07-20 06:05:34,297 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 5 case distinctions, treesize of input 27 treesize of output 56 [2022-07-20 06:05:34,424 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-20 06:05:34,425 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 28 [2022-07-20 06:05:34,521 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:05:34,537 INFO L356 Elim1Store]: treesize reduction 16, result has 42.9 percent of original size [2022-07-20 06:05:34,537 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 30 treesize of output 42 [2022-07-20 06:05:34,768 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-20 06:05:34,768 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 41 [2022-07-20 06:05:34,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:05:35,001 INFO L356 Elim1Store]: treesize reduction 16, result has 42.9 percent of original size [2022-07-20 06:05:35,001 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 43 treesize of output 55 [2022-07-20 06:05:35,150 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-07-20 06:05:35,150 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 9 [2022-07-20 06:05:35,155 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-07-20 06:05:35,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:05:35,266 INFO L356 Elim1Store]: treesize reduction 16, result has 42.9 percent of original size [2022-07-20 06:05:35,266 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 34 treesize of output 44 [2022-07-20 06:05:35,425 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 14 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-07-20 06:05:35,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 06:05:35,489 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1358660792] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-20 06:05:35,489 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-20 06:05:35,489 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 16 [2022-07-20 06:05:35,489 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453594195] [2022-07-20 06:05:35,489 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-20 06:05:35,490 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-07-20 06:05:35,490 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-20 06:05:35,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-07-20 06:05:35,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=318, Unknown=0, NotChecked=0, Total=380 [2022-07-20 06:05:35,491 INFO L87 Difference]: Start difference. First operand 260 states and 285 transitions. Second operand has 17 states, 14 states have (on average 3.857142857142857) internal successors, (54), 15 states have internal predecessors, (54), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-07-20 06:05:39,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:05:39,714 INFO L93 Difference]: Finished difference Result 288 states and 314 transitions. [2022-07-20 06:05:39,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-07-20 06:05:39,714 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 14 states have (on average 3.857142857142857) internal successors, (54), 15 states have internal predecessors, (54), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 49 [2022-07-20 06:05:39,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:05:39,717 INFO L225 Difference]: With dead ends: 288 [2022-07-20 06:05:39,717 INFO L226 Difference]: Without dead ends: 288 [2022-07-20 06:05:39,718 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 83 SyntacticMatches, 6 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=92, Invalid=459, Unknown=1, NotChecked=0, Total=552 [2022-07-20 06:05:39,718 INFO L413 NwaCegarLoop]: 214 mSDtfsCounter, 9 mSDsluCounter, 1197 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 1411 SdHoareTripleChecker+Invalid, 652 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 369 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-20 06:05:39,718 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 1411 Invalid, 652 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 279 Invalid, 0 Unknown, 369 Unchecked, 0.3s Time] [2022-07-20 06:05:39,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2022-07-20 06:05:39,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 273. [2022-07-20 06:05:39,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 273 states, 179 states have (on average 1.4748603351955307) internal successors, (264), 250 states have internal predecessors, (264), 21 states have call successors, (21), 9 states have call predecessors, (21), 8 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-07-20 06:05:39,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 298 transitions. [2022-07-20 06:05:39,727 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 298 transitions. Word has length 49 [2022-07-20 06:05:39,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:05:39,727 INFO L495 AbstractCegarLoop]: Abstraction has 273 states and 298 transitions. [2022-07-20 06:05:39,727 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 14 states have (on average 3.857142857142857) internal successors, (54), 15 states have internal predecessors, (54), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-07-20 06:05:39,727 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 298 transitions. [2022-07-20 06:05:39,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-07-20 06:05:39,728 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:05:39,728 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 06:05:39,742 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Ended with exit code 0 [2022-07-20 06:05:39,947 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Forceful destruction successful, exit code 0 [2022-07-20 06:05:40,142 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2022-07-20 06:05:40,143 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-07-20 06:05:40,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:05:40,143 INFO L85 PathProgramCache]: Analyzing trace with hash -304151575, now seen corresponding path program 1 times [2022-07-20 06:05:40,144 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-20 06:05:40,144 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1063194967] [2022-07-20 06:05:40,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:05:40,144 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-20 06:05:40,144 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-20 06:05:40,145 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-20 06:05:40,146 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2022-07-20 06:05:40,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:05:40,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 38 conjunts are in the unsatisfiable core [2022-07-20 06:05:40,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:05:40,559 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:05:40,586 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-07-20 06:05:40,586 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 12 treesize of output 20 [2022-07-20 06:05:40,591 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-07-20 06:05:40,611 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-07-20 06:05:40,611 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 7 [2022-07-20 06:05:40,772 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:05:40,787 INFO L356 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-07-20 06:05:40,788 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 26 [2022-07-20 06:05:40,910 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-07-20 06:05:40,910 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 16 [2022-07-20 06:05:40,914 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 6 [2022-07-20 06:05:41,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:05:41,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:05:41,114 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-07-20 06:05:41,114 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 31 [2022-07-20 06:05:41,127 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-20 06:05:41,127 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2022-07-20 06:05:41,243 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-07-20 06:05:41,243 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 11 [2022-07-20 06:05:43,388 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:05:43,407 INFO L356 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-07-20 06:05:43,407 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 30 [2022-07-20 06:05:43,903 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:05:43,903 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 06:05:44,078 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-20 06:05:44,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1063194967] [2022-07-20 06:05:44,078 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1063194967] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-20 06:05:44,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1114016521] [2022-07-20 06:05:44,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:05:44,079 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-20 06:05:44,079 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-20 06:05:44,080 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-07-20 06:05:44,081 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2022-07-20 06:05:44,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:05:44,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 25 conjunts are in the unsatisfiable core [2022-07-20 06:05:44,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:05:44,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:05:44,545 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:05:44,561 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-07-20 06:05:44,562 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 20 [2022-07-20 06:05:44,576 INFO L356 Elim1Store]: treesize reduction 2, result has 75.0 percent of original size [2022-07-20 06:05:44,577 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 90 [2022-07-20 06:05:44,634 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-20 06:05:44,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:05:44,756 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-20 06:05:44,829 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-20 06:05:44,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:05:44,966 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-20 06:05:44,985 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-20 06:05:45,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:05:45,110 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-20 06:05:45,169 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-07-20 06:05:45,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 06:05:45,320 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1114016521] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-20 06:05:45,321 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-20 06:05:45,321 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7] total 16 [2022-07-20 06:05:45,323 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [731837446] [2022-07-20 06:05:45,323 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-20 06:05:45,323 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-07-20 06:05:45,323 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-20 06:05:45,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-07-20 06:05:45,324 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=303, Unknown=1, NotChecked=0, Total=380 [2022-07-20 06:05:45,324 INFO L87 Difference]: Start difference. First operand 273 states and 298 transitions. Second operand has 17 states, 14 states have (on average 4.571428571428571) internal successors, (64), 14 states have internal predecessors, (64), 5 states have call successors, (5), 3 states have call predecessors, (5), 4 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-07-20 06:05:46,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:05:46,145 INFO L93 Difference]: Finished difference Result 290 states and 317 transitions. [2022-07-20 06:05:46,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-07-20 06:05:46,146 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 14 states have (on average 4.571428571428571) internal successors, (64), 14 states have internal predecessors, (64), 5 states have call successors, (5), 3 states have call predecessors, (5), 4 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 49 [2022-07-20 06:05:46,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:05:46,148 INFO L225 Difference]: With dead ends: 290 [2022-07-20 06:05:46,148 INFO L226 Difference]: Without dead ends: 290 [2022-07-20 06:05:46,148 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 85 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=109, Invalid=490, Unknown=1, NotChecked=0, Total=600 [2022-07-20 06:05:46,148 INFO L413 NwaCegarLoop]: 215 mSDtfsCounter, 25 mSDsluCounter, 1116 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 1331 SdHoareTripleChecker+Invalid, 747 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 431 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-07-20 06:05:46,149 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 1331 Invalid, 747 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 310 Invalid, 0 Unknown, 431 Unchecked, 0.5s Time] [2022-07-20 06:05:46,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2022-07-20 06:05:46,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 268. [2022-07-20 06:05:46,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 268 states, 176 states have (on average 1.4659090909090908) internal successors, (258), 246 states have internal predecessors, (258), 20 states have call successors, (20), 9 states have call predecessors, (20), 8 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-07-20 06:05:46,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 290 transitions. [2022-07-20 06:05:46,155 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 290 transitions. Word has length 49 [2022-07-20 06:05:46,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:05:46,155 INFO L495 AbstractCegarLoop]: Abstraction has 268 states and 290 transitions. [2022-07-20 06:05:46,155 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 14 states have (on average 4.571428571428571) internal successors, (64), 14 states have internal predecessors, (64), 5 states have call successors, (5), 3 states have call predecessors, (5), 4 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-07-20 06:05:46,156 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 290 transitions. [2022-07-20 06:05:46,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-07-20 06:05:46,157 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:05:46,157 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 06:05:46,165 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (20)] Forceful destruction successful, exit code 0 [2022-07-20 06:05:46,372 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Ended with exit code 0 [2022-07-20 06:05:46,563 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-20 06:05:46,563 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-07-20 06:05:46,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:05:46,564 INFO L85 PathProgramCache]: Analyzing trace with hash 742718239, now seen corresponding path program 1 times [2022-07-20 06:05:46,564 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-20 06:05:46,564 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [111688619] [2022-07-20 06:05:46,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:05:46,564 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-20 06:05:46,565 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-20 06:05:46,566 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-20 06:05:46,567 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2022-07-20 06:05:46,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:05:46,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 18 conjunts are in the unsatisfiable core [2022-07-20 06:05:46,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:05:46,839 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-07-20 06:05:46,839 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 19 [2022-07-20 06:05:46,949 INFO L356 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-07-20 06:05:46,949 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 24 [2022-07-20 06:05:46,962 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-20 06:05:46,972 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-07-20 06:05:46,972 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-20 06:05:46,972 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-20 06:05:46,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [111688619] [2022-07-20 06:05:46,973 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [111688619] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 06:05:46,973 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 06:05:46,973 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-07-20 06:05:46,973 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315886691] [2022-07-20 06:05:46,973 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 06:05:46,973 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-07-20 06:05:46,973 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-20 06:05:46,974 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-07-20 06:05:46,974 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-07-20 06:05:46,974 INFO L87 Difference]: Start difference. First operand 268 states and 290 transitions. Second operand has 7 states, 6 states have (on average 6.333333333333333) internal successors, (38), 6 states have internal predecessors, (38), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-07-20 06:05:47,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:05:47,442 INFO L93 Difference]: Finished difference Result 274 states and 298 transitions. [2022-07-20 06:05:47,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-07-20 06:05:47,442 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 6.333333333333333) internal successors, (38), 6 states have internal predecessors, (38), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 55 [2022-07-20 06:05:47,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:05:47,443 INFO L225 Difference]: With dead ends: 274 [2022-07-20 06:05:47,443 INFO L226 Difference]: Without dead ends: 274 [2022-07-20 06:05:47,444 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-07-20 06:05:47,444 INFO L413 NwaCegarLoop]: 131 mSDtfsCounter, 161 mSDsluCounter, 306 mSDsCounter, 0 mSdLazyCounter, 457 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 167 SdHoareTripleChecker+Valid, 437 SdHoareTripleChecker+Invalid, 627 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 457 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 145 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-07-20 06:05:47,444 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [167 Valid, 437 Invalid, 627 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 457 Invalid, 0 Unknown, 145 Unchecked, 0.4s Time] [2022-07-20 06:05:47,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2022-07-20 06:05:47,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 261. [2022-07-20 06:05:47,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 176 states have (on average 1.4261363636363635) internal successors, (251), 239 states have internal predecessors, (251), 20 states have call successors, (20), 9 states have call predecessors, (20), 8 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-07-20 06:05:47,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 283 transitions. [2022-07-20 06:05:47,451 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 283 transitions. Word has length 55 [2022-07-20 06:05:47,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:05:47,451 INFO L495 AbstractCegarLoop]: Abstraction has 261 states and 283 transitions. [2022-07-20 06:05:47,451 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 6.333333333333333) internal successors, (38), 6 states have internal predecessors, (38), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-07-20 06:05:47,452 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 283 transitions. [2022-07-20 06:05:47,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-07-20 06:05:47,452 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:05:47,452 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 06:05:47,466 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2022-07-20 06:05:47,666 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-20 06:05:47,667 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-07-20 06:05:47,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:05:47,667 INFO L85 PathProgramCache]: Analyzing trace with hash 742718240, now seen corresponding path program 1 times [2022-07-20 06:05:47,668 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-20 06:05:47,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [49912601] [2022-07-20 06:05:47,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:05:47,669 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-20 06:05:47,669 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-20 06:05:47,670 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-20 06:05:47,671 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2022-07-20 06:05:47,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:05:47,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 15 conjunts are in the unsatisfiable core [2022-07-20 06:05:47,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:05:47,965 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-20 06:05:50,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:05:50,084 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-07-20 06:05:50,091 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-20 06:05:50,091 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2022-07-20 06:05:50,127 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-07-20 06:05:50,127 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-20 06:05:50,127 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-20 06:05:50,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [49912601] [2022-07-20 06:05:50,127 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [49912601] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 06:05:50,127 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 06:05:50,128 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-07-20 06:05:50,128 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783382188] [2022-07-20 06:05:50,128 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 06:05:50,128 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-07-20 06:05:50,128 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-20 06:05:50,128 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-07-20 06:05:50,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=29, Unknown=1, NotChecked=0, Total=42 [2022-07-20 06:05:50,129 INFO L87 Difference]: Start difference. First operand 261 states and 283 transitions. Second operand has 7 states, 6 states have (on average 6.333333333333333) internal successors, (38), 6 states have internal predecessors, (38), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-07-20 06:05:51,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:05:51,054 INFO L93 Difference]: Finished difference Result 386 states and 424 transitions. [2022-07-20 06:05:51,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-07-20 06:05:51,055 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 6.333333333333333) internal successors, (38), 6 states have internal predecessors, (38), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 55 [2022-07-20 06:05:51,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:05:51,057 INFO L225 Difference]: With dead ends: 386 [2022-07-20 06:05:51,057 INFO L226 Difference]: Without dead ends: 386 [2022-07-20 06:05:51,057 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=17, Invalid=38, Unknown=1, NotChecked=0, Total=56 [2022-07-20 06:05:51,058 INFO L413 NwaCegarLoop]: 126 mSDtfsCounter, 163 mSDsluCounter, 306 mSDsCounter, 0 mSdLazyCounter, 582 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 169 SdHoareTripleChecker+Valid, 432 SdHoareTripleChecker+Invalid, 792 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 582 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 173 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-07-20 06:05:51,058 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [169 Valid, 432 Invalid, 792 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 582 Invalid, 0 Unknown, 173 Unchecked, 0.9s Time] [2022-07-20 06:05:51,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 386 states. [2022-07-20 06:05:51,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 386 to 322. [2022-07-20 06:05:51,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 231 states have (on average 1.4891774891774892) internal successors, (344), 294 states have internal predecessors, (344), 26 states have call successors, (26), 9 states have call predecessors, (26), 8 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2022-07-20 06:05:51,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 388 transitions. [2022-07-20 06:05:51,066 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 388 transitions. Word has length 55 [2022-07-20 06:05:51,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:05:51,066 INFO L495 AbstractCegarLoop]: Abstraction has 322 states and 388 transitions. [2022-07-20 06:05:51,066 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 6.333333333333333) internal successors, (38), 6 states have internal predecessors, (38), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-07-20 06:05:51,067 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 388 transitions. [2022-07-20 06:05:51,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-07-20 06:05:51,067 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:05:51,067 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 06:05:51,079 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2022-07-20 06:05:51,271 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-20 06:05:51,271 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-07-20 06:05:51,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:05:51,272 INFO L85 PathProgramCache]: Analyzing trace with hash 1549429147, now seen corresponding path program 1 times [2022-07-20 06:05:51,272 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-20 06:05:51,272 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [801676830] [2022-07-20 06:05:51,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:05:51,272 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-20 06:05:51,273 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-20 06:05:51,274 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-20 06:05:51,274 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2022-07-20 06:05:51,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:05:51,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 16 conjunts are in the unsatisfiable core [2022-07-20 06:05:51,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:05:51,557 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 37 [2022-07-20 06:05:51,626 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-20 06:05:51,727 INFO L356 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-07-20 06:05:51,728 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 24 [2022-07-20 06:05:51,764 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-20 06:05:51,842 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:05:51,843 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-20 06:05:51,884 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-20 06:05:51,918 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 24 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-20 06:05:51,918 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 06:05:52,011 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-20 06:05:52,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [801676830] [2022-07-20 06:05:52,011 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [801676830] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-20 06:05:52,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [552621809] [2022-07-20 06:05:52,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:05:52,012 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-20 06:05:52,012 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-20 06:05:52,013 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-07-20 06:05:52,014 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2022-07-20 06:05:52,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:05:52,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 17 conjunts are in the unsatisfiable core [2022-07-20 06:05:52,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:05:52,576 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-20 06:05:52,576 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 48 [2022-07-20 06:05:52,629 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-20 06:05:52,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:05:52,710 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-20 06:05:52,770 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-20 06:05:52,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:05:52,883 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-20 06:05:52,910 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-20 06:05:52,931 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-07-20 06:05:52,932 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-20 06:05:52,932 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [552621809] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 06:05:52,932 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-07-20 06:05:52,932 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [9] total 12 [2022-07-20 06:05:52,933 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534114096] [2022-07-20 06:05:52,933 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 06:05:52,933 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-07-20 06:05:52,933 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-20 06:05:52,934 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-07-20 06:05:52,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2022-07-20 06:05:52,934 INFO L87 Difference]: Start difference. First operand 322 states and 388 transitions. Second operand has 12 states, 11 states have (on average 3.6363636363636362) internal successors, (40), 9 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-07-20 06:05:53,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:05:53,279 INFO L93 Difference]: Finished difference Result 337 states and 403 transitions. [2022-07-20 06:05:53,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-07-20 06:05:53,279 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.6363636363636362) internal successors, (40), 9 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 56 [2022-07-20 06:05:53,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:05:53,281 INFO L225 Difference]: With dead ends: 337 [2022-07-20 06:05:53,281 INFO L226 Difference]: Without dead ends: 337 [2022-07-20 06:05:53,281 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 101 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=80, Invalid=300, Unknown=0, NotChecked=0, Total=380 [2022-07-20 06:05:53,282 INFO L413 NwaCegarLoop]: 194 mSDtfsCounter, 31 mSDsluCounter, 633 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 827 SdHoareTripleChecker+Invalid, 239 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 100 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-20 06:05:53,282 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 827 Invalid, 239 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 127 Invalid, 0 Unknown, 100 Unchecked, 0.3s Time] [2022-07-20 06:05:53,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2022-07-20 06:05:53,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 334. [2022-07-20 06:05:53,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 334 states, 242 states have (on average 1.462809917355372) internal successors, (354), 305 states have internal predecessors, (354), 26 states have call successors, (26), 10 states have call predecessors, (26), 9 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2022-07-20 06:05:53,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 398 transitions. [2022-07-20 06:05:53,293 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 398 transitions. Word has length 56 [2022-07-20 06:05:53,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:05:53,294 INFO L495 AbstractCegarLoop]: Abstraction has 334 states and 398 transitions. [2022-07-20 06:05:53,294 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 3.6363636363636362) internal successors, (40), 9 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-07-20 06:05:53,294 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 398 transitions. [2022-07-20 06:05:53,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-07-20 06:05:53,295 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:05:53,295 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 06:05:53,306 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2022-07-20 06:05:53,518 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2022-07-20 06:05:53,701 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-20 06:05:53,702 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-07-20 06:05:53,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:05:53,702 INFO L85 PathProgramCache]: Analyzing trace with hash 1549429148, now seen corresponding path program 1 times [2022-07-20 06:05:53,702 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-20 06:05:53,702 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [231774903] [2022-07-20 06:05:53,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:05:53,703 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-20 06:05:53,703 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-20 06:05:53,704 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-20 06:05:53,705 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2022-07-20 06:05:53,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:05:53,988 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 19 conjunts are in the unsatisfiable core [2022-07-20 06:05:53,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:05:54,004 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-20 06:05:56,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:05:56,126 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-07-20 06:05:56,133 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-20 06:05:56,134 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2022-07-20 06:05:56,238 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-07-20 06:05:56,239 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 1 case distinctions, treesize of input 14 treesize of output 20 [2022-07-20 06:05:56,322 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 06:05:56,322 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 06:05:56,525 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-20 06:05:56,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [231774903] [2022-07-20 06:05:56,525 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [231774903] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-20 06:05:56,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [810756626] [2022-07-20 06:05:56,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:05:56,525 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-20 06:05:56,525 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-20 06:05:56,526 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-07-20 06:05:56,527 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2022-07-20 06:05:57,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:05:57,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 21 conjunts are in the unsatisfiable core [2022-07-20 06:05:57,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:05:57,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:05:57,080 INFO L356 Elim1Store]: treesize reduction 24, result has 33.3 percent of original size [2022-07-20 06:05:57,080 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 23 [2022-07-20 06:05:57,087 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 37 [2022-07-20 06:05:57,123 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-20 06:05:57,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:05:57,247 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-20 06:05:57,314 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-20 06:05:59,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:05:59,449 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-20 06:05:59,487 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-20 06:05:59,607 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:05:59,608 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-20 06:05:59,687 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2022-07-20 06:05:59,688 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-20 06:05:59,688 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [810756626] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 06:05:59,688 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-07-20 06:05:59,688 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [9] total 15 [2022-07-20 06:05:59,688 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721182215] [2022-07-20 06:05:59,688 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 06:05:59,689 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-07-20 06:05:59,689 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-20 06:05:59,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-07-20 06:05:59,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=246, Unknown=2, NotChecked=0, Total=306 [2022-07-20 06:05:59,690 INFO L87 Difference]: Start difference. First operand 334 states and 398 transitions. Second operand has 8 states, 6 states have (on average 4.833333333333333) internal successors, (29), 6 states have internal predecessors, (29), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-07-20 06:06:00,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:06:00,006 INFO L93 Difference]: Finished difference Result 335 states and 399 transitions. [2022-07-20 06:06:00,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-07-20 06:06:00,007 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 4.833333333333333) internal successors, (29), 6 states have internal predecessors, (29), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 56 [2022-07-20 06:06:00,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:06:00,008 INFO L225 Difference]: With dead ends: 335 [2022-07-20 06:06:00,008 INFO L226 Difference]: Without dead ends: 335 [2022-07-20 06:06:00,009 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 100 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=58, Invalid=246, Unknown=2, NotChecked=0, Total=306 [2022-07-20 06:06:00,009 INFO L413 NwaCegarLoop]: 198 mSDtfsCounter, 23 mSDsluCounter, 414 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 612 SdHoareTripleChecker+Invalid, 404 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 205 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-20 06:06:00,009 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 612 Invalid, 404 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 196 Invalid, 0 Unknown, 205 Unchecked, 0.3s Time] [2022-07-20 06:06:00,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 335 states. [2022-07-20 06:06:00,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 335 to 334. [2022-07-20 06:06:00,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 334 states, 242 states have (on average 1.4586776859504131) internal successors, (353), 305 states have internal predecessors, (353), 26 states have call successors, (26), 10 states have call predecessors, (26), 9 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2022-07-20 06:06:00,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 397 transitions. [2022-07-20 06:06:00,017 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 397 transitions. Word has length 56 [2022-07-20 06:06:00,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:06:00,017 INFO L495 AbstractCegarLoop]: Abstraction has 334 states and 397 transitions. [2022-07-20 06:06:00,017 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 4.833333333333333) internal successors, (29), 6 states have internal predecessors, (29), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-07-20 06:06:00,017 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 397 transitions. [2022-07-20 06:06:00,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-07-20 06:06:00,018 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:06:00,018 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 06:06:00,032 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2022-07-20 06:06:00,237 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2022-07-20 06:06:00,432 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2022-07-20 06:06:00,432 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting failErr0ASSERT_VIOLATIONMEMORY_LEAK === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-07-20 06:06:00,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:06:00,433 INFO L85 PathProgramCache]: Analyzing trace with hash -1700762914, now seen corresponding path program 1 times [2022-07-20 06:06:00,433 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-20 06:06:00,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1537778635] [2022-07-20 06:06:00,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:06:00,433 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-20 06:06:00,433 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-20 06:06:00,435 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-20 06:06:00,437 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2022-07-20 06:06:00,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:06:00,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 395 conjuncts, 43 conjunts are in the unsatisfiable core [2022-07-20 06:06:00,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:06:00,988 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-07-20 06:06:01,086 INFO L356 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-07-20 06:06:01,086 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 19 [2022-07-20 06:06:01,397 WARN L855 $PredicateComparison]: unable to prove that (exists ((|chain_node_~node~0#1.base| (_ BitVec 32)) (v_ArrVal_1745 (Array (_ BitVec 32) (_ BitVec 32)))) (and (not (= |chain_node_~node~0#1.base| (_ bv0 32))) (= (let ((.cse0 (store |c_old(#memory_$Pointer$.base)| |chain_node_~node~0#1.base| v_ArrVal_1745))) (store .cse0 |c_chain_node_#in~ppnode#1.base| (store (select .cse0 |c_chain_node_#in~ppnode#1.base|) |c_chain_node_#in~ppnode#1.offset| |chain_node_~node~0#1.base|))) |c_#memory_$Pointer$.base|) (= (_ bv0 1) (select |c_old(#valid)| |chain_node_~node~0#1.base|)))) is different from true [2022-07-20 06:06:01,417 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:06:01,495 INFO L356 Elim1Store]: treesize reduction 61, result has 37.1 percent of original size [2022-07-20 06:06:01,495 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 56 treesize of output 104 [2022-07-20 06:06:01,519 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-20 06:06:01,520 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2022-07-20 06:06:01,534 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 13 [2022-07-20 06:06:01,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:06:01,566 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2022-07-20 06:06:01,579 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 12 [2022-07-20 06:06:01,608 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 28 [2022-07-20 06:06:01,845 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-20 06:06:01,846 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 24 [2022-07-20 06:06:01,906 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 33 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 2 not checked. [2022-07-20 06:06:01,906 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 06:06:02,108 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-20 06:06:02,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1537778635] [2022-07-20 06:06:02,108 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1537778635] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-20 06:06:02,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [150032678] [2022-07-20 06:06:02,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:06:02,108 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-20 06:06:02,108 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-20 06:06:02,110 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-07-20 06:06:02,114 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2022-07-20 06:06:02,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:06:02,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 395 conjuncts, 39 conjunts are in the unsatisfiable core [2022-07-20 06:06:02,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:06:02,888 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-07-20 06:06:03,100 INFO L356 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-07-20 06:06:03,100 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 19 [2022-07-20 06:06:03,171 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-07-20 06:06:03,171 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 8 [2022-07-20 06:06:03,769 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:06:03,813 INFO L356 Elim1Store]: treesize reduction 20, result has 57.4 percent of original size [2022-07-20 06:06:03,813 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 45 [2022-07-20 06:06:03,827 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-07-20 06:06:03,932 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-20 06:06:04,060 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2022-07-20 06:06:04,069 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 24 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-20 06:06:04,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 06:06:04,146 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-07-20 06:06:04,349 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [150032678] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-20 06:06:04,349 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-20 06:06:04,349 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 23] total 38 [2022-07-20 06:06:04,350 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073576949] [2022-07-20 06:06:04,350 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-20 06:06:04,350 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-07-20 06:06:04,350 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-20 06:06:04,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-07-20 06:06:04,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1565, Unknown=29, NotChecked=80, Total=1806 [2022-07-20 06:06:04,351 INFO L87 Difference]: Start difference. First operand 334 states and 397 transitions. Second operand has 38 states, 38 states have (on average 2.6578947368421053) internal successors, (101), 35 states have internal predecessors, (101), 6 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2022-07-20 06:06:06,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:06:06,848 INFO L93 Difference]: Finished difference Result 371 states and 437 transitions. [2022-07-20 06:06:06,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-07-20 06:06:06,849 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.6578947368421053) internal successors, (101), 35 states have internal predecessors, (101), 6 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) Word has length 61 [2022-07-20 06:06:06,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:06:06,850 INFO L225 Difference]: With dead ends: 371 [2022-07-20 06:06:06,850 INFO L226 Difference]: Without dead ends: 371 [2022-07-20 06:06:06,851 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 104 SyntacticMatches, 3 SemanticMatches, 58 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 786 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=273, Invalid=3096, Unknown=57, NotChecked=114, Total=3540 [2022-07-20 06:06:06,852 INFO L413 NwaCegarLoop]: 184 mSDtfsCounter, 117 mSDsluCounter, 2174 mSDsCounter, 0 mSdLazyCounter, 1166 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 2358 SdHoareTripleChecker+Invalid, 2171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 1166 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 976 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-07-20 06:06:06,852 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [118 Valid, 2358 Invalid, 2171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 1166 Invalid, 0 Unknown, 976 Unchecked, 1.4s Time] [2022-07-20 06:06:06,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2022-07-20 06:06:06,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 348. [2022-07-20 06:06:06,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 348 states, 255 states have (on average 1.4627450980392156) internal successors, (373), 318 states have internal predecessors, (373), 26 states have call successors, (26), 11 states have call predecessors, (26), 10 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2022-07-20 06:06:06,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 417 transitions. [2022-07-20 06:06:06,859 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 417 transitions. Word has length 61 [2022-07-20 06:06:06,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:06:06,860 INFO L495 AbstractCegarLoop]: Abstraction has 348 states and 417 transitions. [2022-07-20 06:06:06,860 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.6578947368421053) internal successors, (101), 35 states have internal predecessors, (101), 6 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2022-07-20 06:06:06,860 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 417 transitions. [2022-07-20 06:06:06,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-07-20 06:06:06,861 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:06:06,861 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 06:06:06,869 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2022-07-20 06:06:07,077 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2022-07-20 06:06:07,267 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-20 06:06:07,267 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting failErr0ASSERT_VIOLATIONMEMORY_LEAK === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-07-20 06:06:07,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:06:07,268 INFO L85 PathProgramCache]: Analyzing trace with hash 1938544488, now seen corresponding path program 1 times [2022-07-20 06:06:07,268 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-20 06:06:07,269 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [685832955] [2022-07-20 06:06:07,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:06:07,269 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-20 06:06:07,269 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-20 06:06:07,271 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-20 06:06:07,271 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2022-07-20 06:06:07,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:06:07,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 397 conjuncts, 61 conjunts are in the unsatisfiable core [2022-07-20 06:06:07,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:06:07,648 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-07-20 06:06:07,780 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-07-20 06:06:07,936 INFO L356 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-07-20 06:06:07,937 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 19 [2022-07-20 06:06:07,999 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-07-20 06:06:07,999 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 8 [2022-07-20 06:06:08,003 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-20 06:06:08,285 WARN L855 $PredicateComparison]: unable to prove that (and (exists ((|chain_node_~node~0#1.base| (_ BitVec 32)) (v_ArrVal_1986 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_1987 (Array (_ BitVec 32) (_ BitVec 32)))) (and (= (store (store |c_old(#memory_$Pointer$.base)| |chain_node_~node~0#1.base| v_ArrVal_1986) |c_chain_node_#in~ppnode#1.base| v_ArrVal_1987) |c_#memory_$Pointer$.base|) (= (_ bv0 1) (select |c_old(#valid)| |chain_node_~node~0#1.base|)))) (not (= |c_#StackHeapBarrier| (_ bv4294967295 32)))) is different from true [2022-07-20 06:06:08,304 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:06:08,343 INFO L356 Elim1Store]: treesize reduction 20, result has 57.4 percent of original size [2022-07-20 06:06:08,343 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 45 [2022-07-20 06:06:08,356 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-20 06:06:08,356 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2022-07-20 06:06:08,363 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-07-20 06:06:08,375 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 4 [2022-07-20 06:06:08,485 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 21 [2022-07-20 06:06:09,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:06:09,261 INFO L356 Elim1Store]: treesize reduction 61, result has 37.1 percent of original size [2022-07-20 06:06:09,261 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 49 treesize of output 101 [2022-07-20 06:06:09,281 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-07-20 06:06:09,302 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-07-20 06:06:09,331 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 22 [2022-07-20 06:06:09,356 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-07-20 06:06:09,414 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-07-20 06:06:10,017 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-20 06:06:10,018 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 107 treesize of output 97 [2022-07-20 06:06:10,024 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 61 [2022-07-20 06:06:10,408 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 13 proven. 17 refuted. 2 times theorem prover too weak. 0 trivial. 4 not checked. [2022-07-20 06:06:10,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 06:06:10,659 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-20 06:06:10,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [685832955] [2022-07-20 06:06:10,659 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [685832955] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-20 06:06:10,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1754088606] [2022-07-20 06:06:10,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:06:10,659 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-20 06:06:10,659 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-20 06:06:10,660 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-07-20 06:06:10,661 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2022-07-20 06:06:11,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:06:11,106 INFO L263 TraceCheckSpWp]: Trace formula consists of 397 conjuncts, 55 conjunts are in the unsatisfiable core [2022-07-20 06:06:11,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:06:11,134 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-07-20 06:06:11,207 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-07-20 06:06:11,361 INFO L356 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-07-20 06:06:11,361 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 19 [2022-07-20 06:06:11,460 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-07-20 06:06:11,460 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 8 [2022-07-20 06:06:12,165 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:06:12,211 INFO L356 Elim1Store]: treesize reduction 20, result has 57.4 percent of original size [2022-07-20 06:06:12,211 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 45 [2022-07-20 06:06:12,230 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-07-20 06:06:12,426 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 21 [2022-07-20 06:06:13,019 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:06:13,047 INFO L356 Elim1Store]: treesize reduction 20, result has 48.7 percent of original size [2022-07-20 06:06:13,047 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 22 treesize of output 34 [2022-07-20 06:06:13,140 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-20 06:06:15,249 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2022-07-20 06:06:15,258 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 3 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-07-20 06:06:15,258 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 06:06:15,324 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-07-20 06:06:15,518 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1754088606] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-20 06:06:15,518 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-20 06:06:15,518 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 26] total 44 [2022-07-20 06:06:15,519 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308691805] [2022-07-20 06:06:15,519 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-20 06:06:15,519 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-07-20 06:06:15,519 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-20 06:06:15,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-07-20 06:06:15,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=1997, Unknown=68, NotChecked=92, Total=2352 [2022-07-20 06:06:15,520 INFO L87 Difference]: Start difference. First operand 348 states and 417 transitions. Second operand has 44 states, 41 states have (on average 1.975609756097561) internal successors, (81), 39 states have internal predecessors, (81), 8 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-07-20 06:06:16,127 WARN L855 $PredicateComparison]: unable to prove that (and (exists ((|chain_node_~node~0#1.base| (_ BitVec 32)) (v_ArrVal_1986 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_1987 (Array (_ BitVec 32) (_ BitVec 32)))) (and (= (store (store |c_old(#memory_$Pointer$.base)| |chain_node_~node~0#1.base| v_ArrVal_1986) |c_chain_node_#in~ppnode#1.base| v_ArrVal_1987) |c_#memory_$Pointer$.base|) (= (_ bv0 1) (select |c_old(#valid)| |chain_node_~node~0#1.base|)))) (exists ((|chain_node_~node~0#1.base| (_ BitVec 32)) (v_ArrVal_1989 (Array (_ BitVec 32) (_ BitVec 32)))) (and (not (= |chain_node_~node~0#1.base| (_ bv0 32))) (= (let ((.cse0 (store |c_old(#memory_$Pointer$.base)| |chain_node_~node~0#1.base| v_ArrVal_1989))) (store .cse0 |c_chain_node_#in~ppnode#1.base| (store (select .cse0 |c_chain_node_#in~ppnode#1.base|) |c_chain_node_#in~ppnode#1.offset| |chain_node_~node~0#1.base|))) |c_#memory_$Pointer$.base|) (bvult |chain_node_~node~0#1.base| |c_#StackHeapBarrier|))) (not (= |c_#StackHeapBarrier| (_ bv4294967295 32))) (not (= (bvadd |c_#StackHeapBarrier| (_ bv1 32)) (_ bv0 32)))) is different from true [2022-07-20 06:06:26,878 WARN L233 SmtUtils]: Spent 10.04s on a formula simplification. DAG size of input: 60 DAG size of output: 52 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-07-20 06:06:27,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 06:06:27,721 INFO L93 Difference]: Finished difference Result 423 states and 498 transitions. [2022-07-20 06:06:27,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-07-20 06:06:27,721 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 41 states have (on average 1.975609756097561) internal successors, (81), 39 states have internal predecessors, (81), 8 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 63 [2022-07-20 06:06:27,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 06:06:27,723 INFO L225 Difference]: With dead ends: 423 [2022-07-20 06:06:27,723 INFO L226 Difference]: Without dead ends: 423 [2022-07-20 06:06:27,724 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 101 SyntacticMatches, 10 SemanticMatches, 61 ConstructedPredicates, 2 IntricatePredicates, 1 DeprecatedPredicates, 1188 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=319, Invalid=3247, Unknown=102, NotChecked=238, Total=3906 [2022-07-20 06:06:27,725 INFO L413 NwaCegarLoop]: 194 mSDtfsCounter, 61 mSDsluCounter, 2837 mSDsCounter, 0 mSdLazyCounter, 802 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 3031 SdHoareTripleChecker+Invalid, 1896 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 802 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1080 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-07-20 06:06:27,725 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 3031 Invalid, 1896 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 802 Invalid, 0 Unknown, 1080 Unchecked, 1.1s Time] [2022-07-20 06:06:27,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 423 states. [2022-07-20 06:06:27,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 423 to 401. [2022-07-20 06:06:27,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 401 states, 301 states have (on average 1.4186046511627908) internal successors, (427), 366 states have internal predecessors, (427), 30 states have call successors, (30), 14 states have call predecessors, (30), 13 states have return successors, (22), 20 states have call predecessors, (22), 22 states have call successors, (22) [2022-07-20 06:06:27,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 401 states to 401 states and 479 transitions. [2022-07-20 06:06:27,733 INFO L78 Accepts]: Start accepts. Automaton has 401 states and 479 transitions. Word has length 63 [2022-07-20 06:06:27,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 06:06:27,733 INFO L495 AbstractCegarLoop]: Abstraction has 401 states and 479 transitions. [2022-07-20 06:06:27,734 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 41 states have (on average 1.975609756097561) internal successors, (81), 39 states have internal predecessors, (81), 8 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-07-20 06:06:27,734 INFO L276 IsEmpty]: Start isEmpty. Operand 401 states and 479 transitions. [2022-07-20 06:06:27,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-07-20 06:06:27,734 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 06:06:27,735 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 06:06:27,744 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2022-07-20 06:06:27,951 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2022-07-20 06:06:28,141 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-20 06:06:28,141 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-07-20 06:06:28,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 06:06:28,142 INFO L85 PathProgramCache]: Analyzing trace with hash 1938533645, now seen corresponding path program 1 times [2022-07-20 06:06:28,142 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-20 06:06:28,142 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [549291465] [2022-07-20 06:06:28,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:06:28,142 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-20 06:06:28,142 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-20 06:06:28,143 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-20 06:06:28,144 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2022-07-20 06:06:28,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:06:28,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 47 conjunts are in the unsatisfiable core [2022-07-20 06:06:28,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:06:28,738 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-07-20 06:06:28,778 INFO L356 Elim1Store]: treesize reduction 23, result has 42.5 percent of original size [2022-07-20 06:06:28,778 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 25 treesize of output 32 [2022-07-20 06:06:28,892 INFO L356 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-07-20 06:06:28,893 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 24 [2022-07-20 06:06:29,258 WARN L855 $PredicateComparison]: unable to prove that (exists ((|chain_node_~node~0#1.base| (_ BitVec 32)) (v_ArrVal_2233 (_ BitVec 1)) (v_ArrVal_2237 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_2236 (Array (_ BitVec 32) (_ BitVec 32)))) (and (= (store (store |c_old(#memory_$Pointer$.base)| |chain_node_~node~0#1.base| v_ArrVal_2236) |c_chain_node_#in~ppnode#1.base| v_ArrVal_2237) |c_#memory_$Pointer$.base|) (= (_ bv0 1) (select |c_old(#valid)| |chain_node_~node~0#1.base|)) (= (store |c_old(#valid)| |chain_node_~node~0#1.base| v_ArrVal_2233) |c_#valid|))) is different from true [2022-07-20 06:06:29,277 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:06:29,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:06:29,309 INFO L356 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2022-07-20 06:06:29,309 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 38 treesize of output 48 [2022-07-20 06:06:29,367 INFO L356 Elim1Store]: treesize reduction 69, result has 37.3 percent of original size [2022-07-20 06:06:29,367 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 31 treesize of output 60 [2022-07-20 06:06:29,378 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-07-20 06:06:29,392 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-07-20 06:06:29,392 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 16 [2022-07-20 06:06:29,603 INFO L356 Elim1Store]: treesize reduction 63, result has 53.0 percent of original size [2022-07-20 06:06:29,603 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 60 treesize of output 117 [2022-07-20 06:06:38,135 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 67 treesize of output 51 [2022-07-20 06:06:38,330 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 21 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 4 not checked. [2022-07-20 06:06:38,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 06:06:40,674 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-20 06:06:40,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [549291465] [2022-07-20 06:06:40,674 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [549291465] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-20 06:06:40,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [522149997] [2022-07-20 06:06:40,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 06:06:40,675 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-20 06:06:40,675 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-20 06:06:40,676 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-07-20 06:06:40,677 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2022-07-20 06:06:41,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 06:06:41,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 47 conjunts are in the unsatisfiable core [2022-07-20 06:06:41,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 06:06:41,471 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-20 06:06:41,757 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-07-20 06:06:42,085 INFO L356 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-07-20 06:06:42,085 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 26 [2022-07-20 06:06:42,209 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-07-20 06:06:42,210 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 15 [2022-07-20 06:06:42,213 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 6 [2022-07-20 06:06:49,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:06:49,120 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 06:06:49,149 INFO L356 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2022-07-20 06:06:49,149 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 40 treesize of output 50 [2022-07-20 06:06:49,175 INFO L356 Elim1Store]: treesize reduction 21, result has 44.7 percent of original size [2022-07-20 06:06:49,176 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 22 treesize of output 31 [2022-07-20 06:06:49,186 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 21 [2022-07-20 06:06:49,212 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 16 [2022-07-20 06:06:50,446 INFO L356 Elim1Store]: treesize reduction 34, result has 49.3 percent of original size [2022-07-20 06:06:50,447 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 55 treesize of output 78 [2022-07-20 06:06:52,562 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 103 treesize of output 79 [2022-07-20 06:06:53,295 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 24 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-20 06:06:53,295 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 06:06:53,561 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [522149997] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-20 06:06:53,561 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-20 06:06:53,561 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 22] total 46 [2022-07-20 06:06:53,561 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1701694048] [2022-07-20 06:06:53,561 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-20 06:06:53,562 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-07-20 06:06:53,562 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-20 06:06:53,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-07-20 06:06:53,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=2546, Unknown=27, NotChecked=102, Total=2862 [2022-07-20 06:06:53,563 INFO L87 Difference]: Start difference. First operand 401 states and 479 transitions. Second operand has 47 states, 45 states have (on average 2.466666666666667) internal successors, (111), 42 states have internal predecessors, (111), 7 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6)