./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/forester-heap/sll-rb-sentinel-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 20ed64ec Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/forester-heap/sll-rb-sentinel-2.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash b39a262e58c4b59fb1c3af72226955d8a31f5200 ..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-20ed64e [2021-08-26 02:22:07,084 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-08-26 02:22:07,085 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-08-26 02:22:07,113 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-08-26 02:22:07,113 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-08-26 02:22:07,116 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-08-26 02:22:07,117 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-08-26 02:22:07,121 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-08-26 02:22:07,123 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-08-26 02:22:07,127 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-08-26 02:22:07,140 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-08-26 02:22:07,145 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-08-26 02:22:07,145 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-08-26 02:22:07,148 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-08-26 02:22:07,149 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-08-26 02:22:07,157 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-08-26 02:22:07,158 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-08-26 02:22:07,159 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-08-26 02:22:07,161 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-08-26 02:22:07,162 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-08-26 02:22:07,163 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-08-26 02:22:07,164 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-08-26 02:22:07,164 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-08-26 02:22:07,165 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-08-26 02:22:07,167 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-08-26 02:22:07,167 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-08-26 02:22:07,167 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-08-26 02:22:07,168 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-08-26 02:22:07,169 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-08-26 02:22:07,169 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-08-26 02:22:07,169 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-08-26 02:22:07,170 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-08-26 02:22:07,170 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-08-26 02:22:07,171 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-08-26 02:22:07,172 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-08-26 02:22:07,172 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-08-26 02:22:07,172 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-08-26 02:22:07,173 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-08-26 02:22:07,173 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-08-26 02:22:07,173 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-08-26 02:22:07,175 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-08-26 02:22:07,175 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-08-26 02:22:07,193 INFO L113 SettingsManager]: Loading preferences was successful [2021-08-26 02:22:07,193 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-08-26 02:22:07,193 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-08-26 02:22:07,193 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-08-26 02:22:07,194 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-08-26 02:22:07,194 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-08-26 02:22:07,194 INFO L138 SettingsManager]: * Use SBE=true [2021-08-26 02:22:07,194 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-08-26 02:22:07,195 INFO L138 SettingsManager]: * sizeof long=4 [2021-08-26 02:22:07,195 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-08-26 02:22:07,195 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-08-26 02:22:07,195 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-08-26 02:22:07,195 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-08-26 02:22:07,195 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-08-26 02:22:07,195 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-08-26 02:22:07,196 INFO L138 SettingsManager]: * sizeof long double=12 [2021-08-26 02:22:07,196 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-08-26 02:22:07,196 INFO L138 SettingsManager]: * Use constant arrays=true [2021-08-26 02:22:07,196 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-08-26 02:22:07,196 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-08-26 02:22:07,198 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-08-26 02:22:07,198 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-08-26 02:22:07,199 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-26 02:22:07,199 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-08-26 02:22:07,199 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-08-26 02:22:07,199 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-08-26 02:22:07,199 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-08-26 02:22:07,200 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-08-26 02:22:07,200 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-08-26 02:22:07,200 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-08-26 02:22:07,200 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b39a262e58c4b59fb1c3af72226955d8a31f5200 [2021-08-26 02:22:07,494 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-08-26 02:22:07,512 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-08-26 02:22:07,514 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-08-26 02:22:07,516 INFO L271 PluginConnector]: Initializing CDTParser... [2021-08-26 02:22:07,516 INFO L275 PluginConnector]: CDTParser initialized [2021-08-26 02:22:07,517 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/forester-heap/sll-rb-sentinel-2.i [2021-08-26 02:22:07,575 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/169a56406/948d86b9bbe54ebe83c86fd2c303e9d3/FLAG87ff05536 [2021-08-26 02:22:08,028 INFO L306 CDTParser]: Found 1 translation units. [2021-08-26 02:22:08,029 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/forester-heap/sll-rb-sentinel-2.i [2021-08-26 02:22:08,040 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/169a56406/948d86b9bbe54ebe83c86fd2c303e9d3/FLAG87ff05536 [2021-08-26 02:22:08,054 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/169a56406/948d86b9bbe54ebe83c86fd2c303e9d3 [2021-08-26 02:22:08,056 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-08-26 02:22:08,057 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-08-26 02:22:08,058 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-08-26 02:22:08,058 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-08-26 02:22:08,062 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-08-26 02:22:08,062 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 02:22:08" (1/1) ... [2021-08-26 02:22:08,063 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1da713b8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 02:22:08, skipping insertion in model container [2021-08-26 02:22:08,063 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 02:22:08" (1/1) ... [2021-08-26 02:22:08,068 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-08-26 02:22:08,092 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-08-26 02:22:08,261 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/forester-heap/sll-rb-sentinel-2.i[22534,22547] [2021-08-26 02:22:08,263 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/forester-heap/sll-rb-sentinel-2.i[22606,22619] [2021-08-26 02:22:08,264 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/forester-heap/sll-rb-sentinel-2.i[22746,22759] [2021-08-26 02:22:08,265 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/forester-heap/sll-rb-sentinel-2.i[22820,22833] [2021-08-26 02:22:08,267 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-26 02:22:08,277 INFO L203 MainTranslator]: Completed pre-run [2021-08-26 02:22:08,304 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/forester-heap/sll-rb-sentinel-2.i[22534,22547] [2021-08-26 02:22:08,305 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/forester-heap/sll-rb-sentinel-2.i[22606,22619] [2021-08-26 02:22:08,317 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/forester-heap/sll-rb-sentinel-2.i[22746,22759] [2021-08-26 02:22:08,317 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/forester-heap/sll-rb-sentinel-2.i[22820,22833] [2021-08-26 02:22:08,319 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-26 02:22:08,341 INFO L208 MainTranslator]: Completed translation [2021-08-26 02:22:08,342 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 02:22:08 WrapperNode [2021-08-26 02:22:08,342 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-08-26 02:22:08,343 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-08-26 02:22:08,343 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-08-26 02:22:08,343 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-08-26 02:22:08,347 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 02:22:08" (1/1) ... [2021-08-26 02:22:08,370 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 02:22:08" (1/1) ... [2021-08-26 02:22:08,392 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-08-26 02:22:08,393 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-08-26 02:22:08,393 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-08-26 02:22:08,393 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-08-26 02:22:08,399 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 02:22:08" (1/1) ... [2021-08-26 02:22:08,400 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 02:22:08" (1/1) ... [2021-08-26 02:22:08,406 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 02:22:08" (1/1) ... [2021-08-26 02:22:08,407 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 02:22:08" (1/1) ... [2021-08-26 02:22:08,426 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 02:22:08" (1/1) ... [2021-08-26 02:22:08,429 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 02:22:08" (1/1) ... [2021-08-26 02:22:08,434 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 02:22:08" (1/1) ... [2021-08-26 02:22:08,438 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-08-26 02:22:08,441 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-08-26 02:22:08,441 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-08-26 02:22:08,441 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-08-26 02:22:08,442 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 02:22:08" (1/1) ... [2021-08-26 02:22:08,448 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-26 02:22:08,454 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 02:22:08,469 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-08-26 02:22:08,488 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-08-26 02:22:08,501 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-08-26 02:22:08,501 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-08-26 02:22:08,502 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-08-26 02:22:08,502 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-08-26 02:22:08,502 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-08-26 02:22:08,502 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-08-26 02:22:08,502 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-08-26 02:22:08,502 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-08-26 02:22:08,502 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-08-26 02:22:08,502 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-08-26 02:22:08,897 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-08-26 02:22:08,897 INFO L299 CfgBuilder]: Removed 15 assume(true) statements. [2021-08-26 02:22:08,898 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 02:22:08 BoogieIcfgContainer [2021-08-26 02:22:08,898 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-08-26 02:22:08,900 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-08-26 02:22:08,900 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-08-26 02:22:08,902 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-08-26 02:22:08,902 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 02:22:08" (1/3) ... [2021-08-26 02:22:08,902 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@307c8b3f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 02:22:08, skipping insertion in model container [2021-08-26 02:22:08,902 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 02:22:08" (2/3) ... [2021-08-26 02:22:08,903 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@307c8b3f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 02:22:08, skipping insertion in model container [2021-08-26 02:22:08,903 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 02:22:08" (3/3) ... [2021-08-26 02:22:08,904 INFO L111 eAbstractionObserver]: Analyzing ICFG sll-rb-sentinel-2.i [2021-08-26 02:22:08,907 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-08-26 02:22:08,907 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 4 error locations. [2021-08-26 02:22:08,937 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-08-26 02:22:08,946 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-08-26 02:22:08,946 INFO L340 AbstractCegarLoop]: Starting to check reachability of 4 error locations. [2021-08-26 02:22:08,958 INFO L276 IsEmpty]: Start isEmpty. Operand has 33 states, 28 states have (on average 1.8928571428571428) internal successors, (53), 32 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:22:08,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-08-26 02:22:08,967 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 02:22:08,967 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-08-26 02:22:08,969 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 1 more)] === [2021-08-26 02:22:08,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 02:22:08,974 INFO L82 PathProgramCache]: Analyzing trace with hash 889968582, now seen corresponding path program 1 times [2021-08-26 02:22:08,981 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 02:22:08,982 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [488739827] [2021-08-26 02:22:08,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:22:08,983 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 02:22:09,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:22:09,135 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:22:09,135 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 02:22:09,136 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [488739827] [2021-08-26 02:22:09,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [488739827] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 02:22:09,137 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 02:22:09,137 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-08-26 02:22:09,143 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [138950764] [2021-08-26 02:22:09,147 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-08-26 02:22:09,147 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 02:22:09,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-08-26 02:22:09,157 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-08-26 02:22:09,159 INFO L87 Difference]: Start difference. First operand has 33 states, 28 states have (on average 1.8928571428571428) internal successors, (53), 32 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:22:09,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 02:22:09,171 INFO L93 Difference]: Finished difference Result 61 states and 98 transitions. [2021-08-26 02:22:09,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-08-26 02:22:09,173 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 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 6 [2021-08-26 02:22:09,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 02:22:09,178 INFO L225 Difference]: With dead ends: 61 [2021-08-26 02:22:09,179 INFO L226 Difference]: Without dead ends: 27 [2021-08-26 02:22:09,181 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0ms TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-08-26 02:22:09,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-08-26 02:22:09,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-08-26 02:22:09,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 26 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:22:09,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2021-08-26 02:22:09,204 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 6 [2021-08-26 02:22:09,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 02:22:09,205 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2021-08-26 02:22:09,205 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:22:09,205 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2021-08-26 02:22:09,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-08-26 02:22:09,206 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 02:22:09,206 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-08-26 02:22:09,206 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-08-26 02:22:09,206 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 1 more)] === [2021-08-26 02:22:09,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 02:22:09,209 INFO L82 PathProgramCache]: Analyzing trace with hash 1806853233, now seen corresponding path program 1 times [2021-08-26 02:22:09,210 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 02:22:09,210 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1482408989] [2021-08-26 02:22:09,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:22:09,210 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 02:22:09,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:22:09,301 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:22:09,301 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 02:22:09,301 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1482408989] [2021-08-26 02:22:09,301 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1482408989] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 02:22:09,301 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 02:22:09,302 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-08-26 02:22:09,302 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817846624] [2021-08-26 02:22:09,303 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-08-26 02:22:09,303 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 02:22:09,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-08-26 02:22:09,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-08-26 02:22:09,305 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:22:09,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 02:22:09,372 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2021-08-26 02:22:09,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-08-26 02:22:09,372 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 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 7 [2021-08-26 02:22:09,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 02:22:09,378 INFO L225 Difference]: With dead ends: 33 [2021-08-26 02:22:09,378 INFO L226 Difference]: Without dead ends: 31 [2021-08-26 02:22:09,379 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 18.3ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-08-26 02:22:09,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-08-26 02:22:09,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 25. [2021-08-26 02:22:09,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 24 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:22:09,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-08-26 02:22:09,381 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 7 [2021-08-26 02:22:09,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 02:22:09,382 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-08-26 02:22:09,382 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:22:09,382 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-08-26 02:22:09,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-08-26 02:22:09,384 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 02:22:09,384 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 02:22:09,384 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-08-26 02:22:09,385 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 1 more)] === [2021-08-26 02:22:09,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 02:22:09,385 INFO L82 PathProgramCache]: Analyzing trace with hash -856511048, now seen corresponding path program 1 times [2021-08-26 02:22:09,385 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 02:22:09,386 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1633250794] [2021-08-26 02:22:09,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:22:09,386 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 02:22:09,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:22:09,466 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:22:09,467 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 02:22:09,467 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1633250794] [2021-08-26 02:22:09,467 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1633250794] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 02:22:09,467 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 02:22:09,467 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-26 02:22:09,468 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955264754] [2021-08-26 02:22:09,468 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-08-26 02:22:09,468 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 02:22:09,468 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-26 02:22:09,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-26 02:22:09,469 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:22:09,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 02:22:09,565 INFO L93 Difference]: Finished difference Result 50 states and 56 transitions. [2021-08-26 02:22:09,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-08-26 02:22:09,566 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-08-26 02:22:09,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 02:22:09,568 INFO L225 Difference]: With dead ends: 50 [2021-08-26 02:22:09,569 INFO L226 Difference]: Without dead ends: 48 [2021-08-26 02:22:09,570 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 43.3ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-08-26 02:22:09,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-08-26 02:22:09,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 32. [2021-08-26 02:22:09,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 31 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:22:09,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2021-08-26 02:22:09,578 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 10 [2021-08-26 02:22:09,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 02:22:09,578 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2021-08-26 02:22:09,579 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:22:09,579 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2021-08-26 02:22:09,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-08-26 02:22:09,580 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 02:22:09,580 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 02:22:09,580 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-08-26 02:22:09,580 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 1 more)] === [2021-08-26 02:22:09,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 02:22:09,581 INFO L82 PathProgramCache]: Analyzing trace with hash 1594081566, now seen corresponding path program 1 times [2021-08-26 02:22:09,581 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 02:22:09,582 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1044703745] [2021-08-26 02:22:09,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:22:09,585 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 02:22:09,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:22:09,784 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:22:09,785 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 02:22:09,785 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1044703745] [2021-08-26 02:22:09,785 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1044703745] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 02:22:09,785 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1622374029] [2021-08-26 02:22:09,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:22:09,786 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 02:22:09,786 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 02:22:09,787 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 02:22:09,788 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-08-26 02:22:09,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:22:09,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 22 conjunts are in the unsatisfiable core [2021-08-26 02:22:09,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 02:22:09,946 INFO L388 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 13 treesize of output 9 [2021-08-26 02:22:09,965 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-08-26 02:22:09,965 INFO L388 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 1 case distinctions, treesize of input 9 treesize of output 11 [2021-08-26 02:22:10,128 INFO L354 Elim1Store]: treesize reduction 74, result has 32.1 percent of original size [2021-08-26 02:22:10,129 INFO L388 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 2 case distinctions, treesize of input 44 treesize of output 41 [2021-08-26 02:22:10,165 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-08-26 02:22:10,166 INFO L388 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 17 treesize of output 21 [2021-08-26 02:22:10,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-26 02:22:10,328 INFO L354 Elim1Store]: treesize reduction 380, result has 8.0 percent of original size [2021-08-26 02:22:10,329 INFO L388 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 4 case distinctions, treesize of input 71 treesize of output 64 [2021-08-26 02:22:10,343 INFO L354 Elim1Store]: treesize reduction 16, result has 36.0 percent of original size [2021-08-26 02:22:10,344 INFO L388 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 47 treesize of output 49 [2021-08-26 02:22:10,749 INFO L354 Elim1Store]: treesize reduction 48, result has 2.0 percent of original size [2021-08-26 02:22:10,750 INFO L388 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 49 treesize of output 25 [2021-08-26 02:22:10,756 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:22:10,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1622374029] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 02:22:10,757 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 02:22:10,757 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2021-08-26 02:22:10,757 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123475845] [2021-08-26 02:22:10,759 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-08-26 02:22:10,759 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 02:22:10,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-08-26 02:22:10,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-08-26 02:22:10,760 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:22:21,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 02:22:21,226 INFO L93 Difference]: Finished difference Result 58 states and 67 transitions. [2021-08-26 02:22:21,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-08-26 02:22:21,227 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 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 13 [2021-08-26 02:22:21,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 02:22:21,228 INFO L225 Difference]: With dead ends: 58 [2021-08-26 02:22:21,228 INFO L226 Difference]: Without dead ends: 56 [2021-08-26 02:22:21,228 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 347.0ms TimeCoverageRelationStatistics Valid=86, Invalid=256, Unknown=0, NotChecked=0, Total=342 [2021-08-26 02:22:21,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-08-26 02:22:21,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 23. [2021-08-26 02:22:21,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 22 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:22:21,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2021-08-26 02:22:21,231 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 13 [2021-08-26 02:22:21,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 02:22:21,232 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2021-08-26 02:22:21,232 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:22:21,232 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2021-08-26 02:22:21,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-08-26 02:22:21,233 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 02:22:21,233 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 02:22:21,258 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-08-26 02:22:21,440 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 02:22:21,441 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 1 more)] === [2021-08-26 02:22:21,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 02:22:21,441 INFO L82 PathProgramCache]: Analyzing trace with hash -1689639521, now seen corresponding path program 1 times [2021-08-26 02:22:21,441 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 02:22:21,442 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1523132007] [2021-08-26 02:22:21,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:22:21,442 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 02:22:21,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:22:21,508 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:22:21,508 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 02:22:21,508 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1523132007] [2021-08-26 02:22:21,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1523132007] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 02:22:21,509 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 02:22:21,509 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-26 02:22:21,509 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984801806] [2021-08-26 02:22:21,509 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-08-26 02:22:21,509 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 02:22:21,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-26 02:22:21,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-26 02:22:21,510 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:22:21,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 02:22:21,560 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2021-08-26 02:22:21,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-08-26 02:22:21,561 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-08-26 02:22:21,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 02:22:21,561 INFO L225 Difference]: With dead ends: 38 [2021-08-26 02:22:21,561 INFO L226 Difference]: Without dead ends: 26 [2021-08-26 02:22:21,562 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.8ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-08-26 02:22:21,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-08-26 02:22:21,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2021-08-26 02:22:21,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 24 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:22:21,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-08-26 02:22:21,564 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 14 [2021-08-26 02:22:21,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 02:22:21,564 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-08-26 02:22:21,564 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:22:21,565 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-08-26 02:22:21,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-08-26 02:22:21,565 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 02:22:21,565 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 02:22:21,565 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-08-26 02:22:21,566 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 1 more)] === [2021-08-26 02:22:21,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 02:22:21,566 INFO L82 PathProgramCache]: Analyzing trace with hash 2084817261, now seen corresponding path program 1 times [2021-08-26 02:22:21,566 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 02:22:21,566 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31822277] [2021-08-26 02:22:21,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:22:21,567 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 02:22:21,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:22:21,620 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:22:21,621 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 02:22:21,621 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31822277] [2021-08-26 02:22:21,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [31822277] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 02:22:21,623 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [262919282] [2021-08-26 02:22:21,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:22:21,624 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 02:22:21,624 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 02:22:21,633 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 02:22:21,634 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-08-26 02:22:21,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:22:21,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 13 conjunts are in the unsatisfiable core [2021-08-26 02:22:21,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 02:22:21,761 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-26 02:22:21,795 INFO L354 Elim1Store]: treesize reduction 50, result has 32.4 percent of original size [2021-08-26 02:22:21,796 INFO L388 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 1 case distinctions, treesize of input 38 treesize of output 32 [2021-08-26 02:22:21,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-26 02:22:21,868 INFO L354 Elim1Store]: treesize reduction 57, result has 23.0 percent of original size [2021-08-26 02:22:21,868 INFO L388 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 1 case distinctions, treesize of input 38 treesize of output 25 [2021-08-26 02:22:22,454 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-08-26 02:22:22,455 INFO L388 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 66 treesize of output 54 [2021-08-26 02:22:22,463 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-08-26 02:22:22,464 INFO L388 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 51 treesize of output 51 [2021-08-26 02:22:22,509 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:22:22,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [262919282] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 02:22:22,509 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 02:22:22,509 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 7 [2021-08-26 02:22:22,510 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [692792056] [2021-08-26 02:22:22,511 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-08-26 02:22:22,511 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 02:22:22,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-08-26 02:22:22,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-08-26 02:22:22,516 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:22:22,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 02:22:22,756 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2021-08-26 02:22:22,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-08-26 02:22:22,756 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 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 17 [2021-08-26 02:22:22,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 02:22:22,757 INFO L225 Difference]: With dead ends: 49 [2021-08-26 02:22:22,757 INFO L226 Difference]: Without dead ends: 27 [2021-08-26 02:22:22,757 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 245.8ms TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-08-26 02:22:22,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-08-26 02:22:22,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-08-26 02:22:22,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 25 states have (on average 1.2) internal successors, (30), 26 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:22:22,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2021-08-26 02:22:22,759 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 17 [2021-08-26 02:22:22,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 02:22:22,760 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2021-08-26 02:22:22,760 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:22:22,760 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2021-08-26 02:22:22,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-08-26 02:22:22,760 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 02:22:22,760 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 02:22:22,780 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-08-26 02:22:22,970 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-08-26 02:22:22,970 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 1 more)] === [2021-08-26 02:22:22,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 02:22:22,970 INFO L82 PathProgramCache]: Analyzing trace with hash -1088473273, now seen corresponding path program 1 times [2021-08-26 02:22:22,971 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 02:22:22,971 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1030281865] [2021-08-26 02:22:22,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:22:22,971 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 02:22:22,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:22:23,110 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:22:23,110 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 02:22:23,110 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1030281865] [2021-08-26 02:22:23,110 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1030281865] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 02:22:23,111 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1794364151] [2021-08-26 02:22:23,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:22:23,111 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 02:22:23,111 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 02:22:23,112 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 02:22:23,113 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-08-26 02:22:23,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:22:23,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 34 conjunts are in the unsatisfiable core [2021-08-26 02:22:23,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 02:22:23,292 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-08-26 02:22:23,293 INFO L388 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 1 case distinctions, treesize of input 9 treesize of output 11 [2021-08-26 02:22:23,357 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-08-26 02:22:23,357 INFO L388 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 1 case distinctions, treesize of input 27 treesize of output 15 [2021-08-26 02:22:23,386 INFO L354 Elim1Store]: treesize reduction 44, result has 30.2 percent of original size [2021-08-26 02:22:23,387 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 22 treesize of output 33 [2021-08-26 02:22:23,399 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 27 treesize of output 15 [2021-08-26 02:22:23,481 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-08-26 02:22:23,482 INFO L388 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 224 treesize of output 161 [2021-08-26 02:22:23,555 INFO L354 Elim1Store]: treesize reduction 197, result has 10.0 percent of original size [2021-08-26 02:22:23,555 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 197 treesize of output 119 [2021-08-26 02:22:23,613 INFO L354 Elim1Store]: treesize reduction 507, result has 8.2 percent of original size [2021-08-26 02:22:23,614 INFO L388 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 6 case distinctions, treesize of input 158 treesize of output 106 [2021-08-26 02:22:23,635 INFO L354 Elim1Store]: treesize reduction 44, result has 48.2 percent of original size [2021-08-26 02:22:23,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 94 treesize of output 114 [2021-08-26 02:22:23,972 INFO L354 Elim1Store]: treesize reduction 56, result has 1.8 percent of original size [2021-08-26 02:22:23,973 INFO L388 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 4 new quantified variables, introduced 3 case distinctions, treesize of input 116 treesize of output 83 [2021-08-26 02:22:24,547 INFO L354 Elim1Store]: treesize reduction 29, result has 12.1 percent of original size [2021-08-26 02:22:24,547 INFO L388 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 5 new quantified variables, introduced 3 case distinctions, treesize of input 75 treesize of output 33 [2021-08-26 02:22:24,553 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:22:24,553 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1794364151] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 02:22:24,553 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 02:22:24,553 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2021-08-26 02:22:24,554 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781477630] [2021-08-26 02:22:24,554 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-08-26 02:22:24,554 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 02:22:24,554 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-08-26 02:22:24,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=124, Unknown=1, NotChecked=0, Total=156 [2021-08-26 02:22:24,555 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 13 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:22:24,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 02:22:24,898 INFO L93 Difference]: Finished difference Result 84 states and 96 transitions. [2021-08-26 02:22:24,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-08-26 02:22:24,899 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 13 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-08-26 02:22:24,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 02:22:24,899 INFO L225 Difference]: With dead ends: 84 [2021-08-26 02:22:24,899 INFO L226 Difference]: Without dead ends: 82 [2021-08-26 02:22:24,900 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 763.4ms TimeCoverageRelationStatistics Valid=70, Invalid=271, Unknown=1, NotChecked=0, Total=342 [2021-08-26 02:22:24,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-08-26 02:22:24,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 42. [2021-08-26 02:22:24,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 40 states have (on average 1.2) internal successors, (48), 41 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:22:24,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 48 transitions. [2021-08-26 02:22:24,904 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 48 transitions. Word has length 20 [2021-08-26 02:22:24,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 02:22:24,904 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 48 transitions. [2021-08-26 02:22:24,904 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 13 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:22:24,904 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 48 transitions. [2021-08-26 02:22:24,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-08-26 02:22:24,904 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 02:22:24,904 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 02:22:24,922 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-08-26 02:22:25,105 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 02:22:25,105 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 1 more)] === [2021-08-26 02:22:25,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 02:22:25,106 INFO L82 PathProgramCache]: Analyzing trace with hash -67404919, now seen corresponding path program 1 times [2021-08-26 02:22:25,106 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 02:22:25,106 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2110969684] [2021-08-26 02:22:25,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:22:25,106 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 02:22:25,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:22:25,318 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:22:25,318 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 02:22:25,318 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2110969684] [2021-08-26 02:22:25,318 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2110969684] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 02:22:25,318 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1325487130] [2021-08-26 02:22:25,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:22:25,319 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 02:22:25,319 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 02:22:25,319 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 02:22:25,321 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-08-26 02:22:25,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:22:25,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 30 conjunts are in the unsatisfiable core [2021-08-26 02:22:25,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 02:22:25,521 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-08-26 02:22:25,521 INFO L388 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 1 case distinctions, treesize of input 9 treesize of output 11 [2021-08-26 02:22:25,594 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-08-26 02:22:25,594 INFO L388 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 1 case distinctions, treesize of input 27 treesize of output 15 [2021-08-26 02:22:25,607 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-08-26 02:22:25,608 INFO L388 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 1 case distinctions, treesize of input 43 treesize of output 30 [2021-08-26 02:22:25,617 INFO L354 Elim1Store]: treesize reduction 25, result has 24.2 percent of original size [2021-08-26 02:22:25,617 INFO L388 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 27 treesize of output 25 [2021-08-26 02:22:25,686 INFO L354 Elim1Store]: treesize reduction 112, result has 14.5 percent of original size [2021-08-26 02:22:25,687 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 146 treesize of output 111 [2021-08-26 02:22:25,689 INFO L388 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 107 treesize of output 99 [2021-08-26 02:22:25,706 INFO L354 Elim1Store]: treesize reduction 88, result has 17.8 percent of original size [2021-08-26 02:22:25,707 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 99 treesize of output 83 [2021-08-26 02:22:25,982 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-08-26 02:22:25,983 INFO L388 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 60 treesize of output 43 [2021-08-26 02:22:25,988 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-08-26 02:22:25,988 INFO L388 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 33 treesize of output 21 [2021-08-26 02:22:26,017 INFO L388 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 15 treesize of output 7 [2021-08-26 02:22:26,038 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:22:26,038 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1325487130] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 02:22:26,039 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 02:22:26,039 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 18 [2021-08-26 02:22:26,039 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481043728] [2021-08-26 02:22:26,039 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-08-26 02:22:26,039 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 02:22:26,039 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-08-26 02:22:26,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2021-08-26 02:22:26,040 INFO L87 Difference]: Start difference. First operand 42 states and 48 transitions. Second operand has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 18 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:22:26,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 02:22:26,547 INFO L93 Difference]: Finished difference Result 83 states and 94 transitions. [2021-08-26 02:22:26,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-08-26 02:22:26,548 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 18 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-08-26 02:22:26,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 02:22:26,549 INFO L225 Difference]: With dead ends: 83 [2021-08-26 02:22:26,549 INFO L226 Difference]: Without dead ends: 71 [2021-08-26 02:22:26,550 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 428.0ms TimeCoverageRelationStatistics Valid=127, Invalid=523, Unknown=0, NotChecked=0, Total=650 [2021-08-26 02:22:26,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-08-26 02:22:26,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 53. [2021-08-26 02:22:26,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 51 states have (on average 1.1764705882352942) internal successors, (60), 52 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:22:26,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 60 transitions. [2021-08-26 02:22:26,555 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 60 transitions. Word has length 20 [2021-08-26 02:22:26,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 02:22:26,555 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 60 transitions. [2021-08-26 02:22:26,555 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 18 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:22:26,555 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 60 transitions. [2021-08-26 02:22:26,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-08-26 02:22:26,560 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 02:22:26,560 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 02:22:26,587 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-08-26 02:22:26,777 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 02:22:26,777 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 1 more)] === [2021-08-26 02:22:26,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 02:22:26,777 INFO L82 PathProgramCache]: Analyzing trace with hash 299800945, now seen corresponding path program 1 times [2021-08-26 02:22:26,777 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 02:22:26,777 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [184487572] [2021-08-26 02:22:26,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:22:26,778 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 02:22:26,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-26 02:22:26,801 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-26 02:22:26,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-26 02:22:26,835 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-26 02:22:26,835 INFO L626 BasicCegarLoop]: Counterexample is feasible [2021-08-26 02:22:26,836 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr3ASSERT_VIOLATIONERROR_FUNCTION [2021-08-26 02:22:26,837 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-08-26 02:22:26,837 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION [2021-08-26 02:22:26,837 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION [2021-08-26 02:22:26,838 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-08-26 02:22:26,842 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-08-26 02:22:26,859 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 26.08 02:22:26 BoogieIcfgContainer [2021-08-26 02:22:26,859 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-08-26 02:22:26,860 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-08-26 02:22:26,860 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-08-26 02:22:26,860 INFO L275 PluginConnector]: Witness Printer initialized [2021-08-26 02:22:26,860 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 02:22:08" (3/4) ... [2021-08-26 02:22:26,865 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-08-26 02:22:26,915 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2021-08-26 02:22:26,915 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-08-26 02:22:26,916 INFO L168 Benchmark]: Toolchain (without parser) took 18859.15 ms. Allocated memory was 65.0 MB in the beginning and 96.5 MB in the end (delta: 31.5 MB). Free memory was 46.7 MB in the beginning and 55.6 MB in the end (delta: -8.9 MB). Peak memory consumption was 21.9 MB. Max. memory is 16.1 GB. [2021-08-26 02:22:26,916 INFO L168 Benchmark]: CDTParser took 0.16 ms. Allocated memory is still 65.0 MB. Free memory is still 47.5 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-08-26 02:22:26,916 INFO L168 Benchmark]: CACSL2BoogieTranslator took 284.42 ms. Allocated memory is still 65.0 MB. Free memory was 46.5 MB in the beginning and 40.8 MB in the end (delta: 5.7 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-08-26 02:22:26,918 INFO L168 Benchmark]: Boogie Procedure Inliner took 49.99 ms. Allocated memory is still 65.0 MB. Free memory was 40.8 MB in the beginning and 38.6 MB in the end (delta: 2.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-08-26 02:22:26,920 INFO L168 Benchmark]: Boogie Preprocessor took 47.29 ms. Allocated memory is still 65.0 MB. Free memory was 38.6 MB in the beginning and 37.0 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-08-26 02:22:26,920 INFO L168 Benchmark]: RCFGBuilder took 457.64 ms. Allocated memory was 65.0 MB in the beginning and 79.7 MB in the end (delta: 14.7 MB). Free memory was 37.0 MB in the beginning and 46.7 MB in the end (delta: -9.7 MB). Peak memory consumption was 14.2 MB. Max. memory is 16.1 GB. [2021-08-26 02:22:26,920 INFO L168 Benchmark]: TraceAbstraction took 17959.77 ms. Allocated memory was 79.7 MB in the beginning and 96.5 MB in the end (delta: 16.8 MB). Free memory was 45.9 MB in the beginning and 58.7 MB in the end (delta: -12.8 MB). Peak memory consumption was 4.5 MB. Max. memory is 16.1 GB. [2021-08-26 02:22:26,920 INFO L168 Benchmark]: Witness Printer took 55.78 ms. Allocated memory is still 96.5 MB. Free memory was 58.7 MB in the beginning and 55.6 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-08-26 02:22:26,921 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16 ms. Allocated memory is still 65.0 MB. Free memory is still 47.5 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 284.42 ms. Allocated memory is still 65.0 MB. Free memory was 46.5 MB in the beginning and 40.8 MB in the end (delta: 5.7 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 49.99 ms. Allocated memory is still 65.0 MB. Free memory was 40.8 MB in the beginning and 38.6 MB in the end (delta: 2.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 47.29 ms. Allocated memory is still 65.0 MB. Free memory was 38.6 MB in the beginning and 37.0 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 457.64 ms. Allocated memory was 65.0 MB in the beginning and 79.7 MB in the end (delta: 14.7 MB). Free memory was 37.0 MB in the beginning and 46.7 MB in the end (delta: -9.7 MB). Peak memory consumption was 14.2 MB. Max. memory is 16.1 GB. * TraceAbstraction took 17959.77 ms. Allocated memory was 79.7 MB in the beginning and 96.5 MB in the end (delta: 16.8 MB). Free memory was 45.9 MB in the beginning and 58.7 MB in the end (delta: -12.8 MB). Peak memory consumption was 4.5 MB. Max. memory is 16.1 GB. * Witness Printer took 55.78 ms. Allocated memory is still 96.5 MB. Free memory was 58.7 MB in the beginning and 55.6 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 1050]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L1005] SLL* null = malloc(sizeof(SLL)); [L1006] null->colour = BLACK [L1007] null->next = ((void*)0) [L1009] SLL* list = malloc(sizeof(SLL)); [L1010] list->next = null [L1011] list->colour = BLACK [L1013] SLL* end = list; [L1016] COND TRUE __VERIFIER_nondet_int() [L1019] end->next = malloc(sizeof(SLL)) [L1020] EXPR end->next [L1020] end = end->next [L1021] end->next = null [L1023] COND FALSE !(__VERIFIER_nondet_int()) [L1029] end->colour = RED [L1030] end->next = malloc(sizeof(SLL)) [L1031] EXPR end->next [L1031] end = end->next [L1032] end->next = null [L1033] end->colour = BLACK [L1016] COND FALSE !(__VERIFIER_nondet_int()) [L1037] end = null [L1038] end = list [L1041] COND FALSE !(!(null != end)) [L1042] EXPR end->colour [L1042] COND FALSE !(!(BLACK == end->colour)) [L1044] COND TRUE null != end [L1046] EXPR end->colour [L1046] COND FALSE !(RED == end->colour) [L1053] EXPR end->next [L1053] end = end->next [L1044] COND TRUE null != end [L1046] EXPR end->colour [L1046] COND TRUE RED == end->colour [L1048] EXPR end->next [L1048] end = end->next [L1049] COND FALSE !(!(null != end)) [L1050] EXPR end->colour [L1050] COND TRUE !(BLACK != end->colour) [L1050] reach_error() - UnprovableResult [Line: 1041]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: Not analyzed. - UnprovableResult [Line: 1042]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: Not analyzed. - UnprovableResult [Line: 1049]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: Not analyzed. - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 33 locations, 4 error locations. Started 1 CEGAR loops. OverallTime: 17904.7ms, OverallIterations: 9, TraceHistogramMax: 2, EmptinessCheckTime: 22.8ms, AutomataDifference: 11833.1ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 7.0ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 201 SDtfs, 329 SDslu, 682 SDs, 0 SdLazy, 748 SolverSat, 124 SolverUnsat, 5 SolverUnknown, 0 SolverNotchecked, 10686.0ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 142 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 1859.9ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=53occurred in iteration=8, InterpolantAutomatonStates: 59, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 39.6ms AutomataMinimizationTime, 8 MinimizatonAttempts, 114 StatesRemovedByMinimization, 6 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 85.4ms SsaConstructionTime, 220.3ms SatisfiabilityAnalysisTime, 4263.6ms InterpolantComputationTime, 200 NumberOfCodeBlocks, 200 NumberOfCodeBlocksAsserted, 13 NumberOfCheckSat, 165 ConstructedInterpolants, 8 QuantifiedInterpolants, 4077 SizeOfPredicates, 30 NumberOfNonLiveVariables, 414 ConjunctsInSsa, 99 ConjunctsInUnsatCore, 12 InterpolantComputations, 4 PerfectInterpolantSequences, 2/24 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-08-26 02:22:26,944 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 0 Received shutdown request...