./Ultimate.py --spec ../sv-benchmarks/c/properties/valid-memsafety.prp --file ../sv-benchmarks/c/memsafety/test-0102-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version c3fed411 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/memsafety/test-0102-1.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash fa260939b291574cde59d3c10d7828de68c26744f55119227115b01940792a6f --- Real Ultimate output --- This is Ultimate 0.2.2-tmp.no-commuhash-c3fed41 [2021-12-18 20:19:27,185 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-18 20:19:27,187 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-18 20:19:27,216 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-18 20:19:27,216 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-18 20:19:27,217 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-18 20:19:27,218 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-18 20:19:27,219 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-18 20:19:27,224 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-18 20:19:27,225 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-18 20:19:27,225 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-18 20:19:27,226 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-18 20:19:27,227 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-18 20:19:27,228 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-18 20:19:27,228 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-18 20:19:27,229 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-18 20:19:27,230 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-18 20:19:27,230 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-18 20:19:27,231 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-18 20:19:27,232 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-18 20:19:27,233 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-18 20:19:27,236 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-18 20:19:27,237 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-18 20:19:27,237 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-18 20:19:27,239 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-18 20:19:27,239 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-18 20:19:27,239 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-18 20:19:27,239 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-18 20:19:27,240 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-18 20:19:27,240 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-18 20:19:27,240 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-18 20:19:27,241 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-18 20:19:27,241 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-18 20:19:27,242 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-18 20:19:27,242 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-18 20:19:27,242 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-18 20:19:27,243 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-18 20:19:27,243 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-18 20:19:27,243 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-18 20:19:27,244 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-18 20:19:27,244 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-18 20:19:27,245 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-12-18 20:19:27,274 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-18 20:19:27,275 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-18 20:19:27,275 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-18 20:19:27,275 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-18 20:19:27,276 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-18 20:19:27,276 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-18 20:19:27,277 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-18 20:19:27,277 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-18 20:19:27,277 INFO L138 SettingsManager]: * Use SBE=true [2021-12-18 20:19:27,277 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-18 20:19:27,278 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-18 20:19:27,278 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-18 20:19:27,278 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-18 20:19:27,279 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-18 20:19:27,279 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-18 20:19:27,279 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-18 20:19:27,279 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-18 20:19:27,279 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-12-18 20:19:27,279 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-18 20:19:27,279 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-18 20:19:27,280 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-18 20:19:27,280 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-18 20:19:27,280 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-18 20:19:27,280 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-18 20:19:27,280 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-18 20:19:27,280 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-18 20:19:27,281 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-18 20:19:27,281 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-18 20:19:27,281 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-18 20:19:27,281 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-18 20:19:27,281 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-18 20:19:27,281 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fa260939b291574cde59d3c10d7828de68c26744f55119227115b01940792a6f [2021-12-18 20:19:27,484 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-18 20:19:27,505 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-18 20:19:27,507 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-18 20:19:27,508 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-18 20:19:27,509 INFO L275 PluginConnector]: CDTParser initialized [2021-12-18 20:19:27,510 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/memsafety/test-0102-1.i [2021-12-18 20:19:27,552 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/36c4ec6f3/1afd4b2d0e714c788a555db6e3148287/FLAG71661031e [2021-12-18 20:19:27,949 INFO L306 CDTParser]: Found 1 translation units. [2021-12-18 20:19:27,949 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/memsafety/test-0102-1.i [2021-12-18 20:19:27,959 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/36c4ec6f3/1afd4b2d0e714c788a555db6e3148287/FLAG71661031e [2021-12-18 20:19:27,970 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/36c4ec6f3/1afd4b2d0e714c788a555db6e3148287 [2021-12-18 20:19:27,972 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-18 20:19:27,973 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-18 20:19:27,985 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-18 20:19:27,985 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-18 20:19:27,988 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-18 20:19:27,988 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.12 08:19:27" (1/1) ... [2021-12-18 20:19:27,989 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@453e7b02 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:19:27, skipping insertion in model container [2021-12-18 20:19:27,990 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.12 08:19:27" (1/1) ... [2021-12-18 20:19:27,994 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-18 20:19:28,013 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-18 20:19:28,188 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-18 20:19:28,194 ERROR L326 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2021-12-18 20:19:28,194 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@77b334b1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:19:28, skipping insertion in model container [2021-12-18 20:19:28,194 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-18 20:19:28,195 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-12-18 20:19:28,196 INFO L158 Benchmark]: Toolchain (without parser) took 222.61ms. Allocated memory is still 96.5MB. Free memory was 65.3MB in the beginning and 70.0MB in the end (delta: -4.7MB). Peak memory consumption was 9.8MB. Max. memory is 16.1GB. [2021-12-18 20:19:28,196 INFO L158 Benchmark]: CDTParser took 0.16ms. Allocated memory is still 96.5MB. Free memory was 53.6MB in the beginning and 53.5MB in the end (delta: 42.0kB). There was no memory consumed. Max. memory is 16.1GB. [2021-12-18 20:19:28,197 INFO L158 Benchmark]: CACSL2BoogieTranslator took 209.27ms. Allocated memory is still 96.5MB. Free memory was 65.1MB in the beginning and 70.0MB in the end (delta: -4.9MB). Peak memory consumption was 9.8MB. Max. memory is 16.1GB. [2021-12-18 20:19:28,198 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16ms. Allocated memory is still 96.5MB. Free memory was 53.6MB in the beginning and 53.5MB in the end (delta: 42.0kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 209.27ms. Allocated memory is still 96.5MB. Free memory was 65.1MB in the beginning and 70.0MB in the end (delta: -4.9MB). Peak memory consumption was 9.8MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 551]: Unsupported Syntax Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/memsafety/test-0102-1.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash fa260939b291574cde59d3c10d7828de68c26744f55119227115b01940792a6f --- Real Ultimate output --- This is Ultimate 0.2.2-tmp.no-commuhash-c3fed41 [2021-12-18 20:19:29,707 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-18 20:19:29,709 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-18 20:19:29,739 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-18 20:19:29,741 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-18 20:19:29,745 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-18 20:19:29,747 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-18 20:19:29,751 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-18 20:19:29,753 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-18 20:19:29,758 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-18 20:19:29,759 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-18 20:19:29,764 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-18 20:19:29,765 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-18 20:19:29,767 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-18 20:19:29,768 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-18 20:19:29,772 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-18 20:19:29,773 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-18 20:19:29,774 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-18 20:19:29,777 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-18 20:19:29,780 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-18 20:19:29,783 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-18 20:19:29,784 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-18 20:19:29,785 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-18 20:19:29,786 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-18 20:19:29,789 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-18 20:19:29,790 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-18 20:19:29,790 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-18 20:19:29,791 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-18 20:19:29,792 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-18 20:19:29,792 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-18 20:19:29,793 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-18 20:19:29,793 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-18 20:19:29,794 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-18 20:19:29,795 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-18 20:19:29,796 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-18 20:19:29,796 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-18 20:19:29,796 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-18 20:19:29,797 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-18 20:19:29,797 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-18 20:19:29,798 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-18 20:19:29,799 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-18 20:19:29,799 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf [2021-12-18 20:19:29,827 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-18 20:19:29,827 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-18 20:19:29,828 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-18 20:19:29,828 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-18 20:19:29,829 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-18 20:19:29,829 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-18 20:19:29,830 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-18 20:19:29,830 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-18 20:19:29,830 INFO L138 SettingsManager]: * Use SBE=true [2021-12-18 20:19:29,830 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-18 20:19:29,831 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-18 20:19:29,831 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-18 20:19:29,831 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-18 20:19:29,831 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-18 20:19:29,832 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-18 20:19:29,832 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-18 20:19:29,832 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-18 20:19:29,832 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-12-18 20:19:29,832 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-18 20:19:29,832 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-18 20:19:29,832 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-12-18 20:19:29,833 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-12-18 20:19:29,833 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-18 20:19:29,833 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-18 20:19:29,833 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-18 20:19:29,833 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-18 20:19:29,833 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-18 20:19:29,834 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-18 20:19:29,834 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-18 20:19:29,834 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-18 20:19:29,834 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2021-12-18 20:19:29,834 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-12-18 20:19:29,834 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-18 20:19:29,835 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-12-18 20:19:29,835 INFO L138 SettingsManager]: * Logic for external solver=AUFBV WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fa260939b291574cde59d3c10d7828de68c26744f55119227115b01940792a6f [2021-12-18 20:19:30,072 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-18 20:19:30,089 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-18 20:19:30,091 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-18 20:19:30,093 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-18 20:19:30,094 INFO L275 PluginConnector]: CDTParser initialized [2021-12-18 20:19:30,095 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/memsafety/test-0102-1.i [2021-12-18 20:19:30,142 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9225a1b87/d6d670a036f34142a0372d32355b3651/FLAG28121b95b [2021-12-18 20:19:30,591 INFO L306 CDTParser]: Found 1 translation units. [2021-12-18 20:19:30,594 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/memsafety/test-0102-1.i [2021-12-18 20:19:30,606 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9225a1b87/d6d670a036f34142a0372d32355b3651/FLAG28121b95b [2021-12-18 20:19:30,624 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9225a1b87/d6d670a036f34142a0372d32355b3651 [2021-12-18 20:19:30,626 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-18 20:19:30,628 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-18 20:19:30,629 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-18 20:19:30,629 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-18 20:19:30,632 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-18 20:19:30,632 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.12 08:19:30" (1/1) ... [2021-12-18 20:19:30,633 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6c01532f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:19:30, skipping insertion in model container [2021-12-18 20:19:30,633 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.12 08:19:30" (1/1) ... [2021-12-18 20:19:30,638 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-18 20:19:30,661 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-18 20:19:30,886 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-18 20:19:30,901 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-12-18 20:19:30,912 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-18 20:19:30,944 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-18 20:19:30,949 INFO L203 MainTranslator]: Completed pre-run [2021-12-18 20:19:30,989 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-18 20:19:31,009 INFO L208 MainTranslator]: Completed translation [2021-12-18 20:19:31,010 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:19:31 WrapperNode [2021-12-18 20:19:31,010 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-18 20:19:31,011 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-18 20:19:31,011 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-18 20:19:31,011 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-18 20:19:31,015 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:19:31" (1/1) ... [2021-12-18 20:19:31,026 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:19:31" (1/1) ... [2021-12-18 20:19:31,042 INFO L137 Inliner]: procedures = 136, calls = 38, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 86 [2021-12-18 20:19:31,042 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-18 20:19:31,043 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-18 20:19:31,043 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-18 20:19:31,043 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-18 20:19:31,048 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:19:31" (1/1) ... [2021-12-18 20:19:31,049 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:19:31" (1/1) ... [2021-12-18 20:19:31,053 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:19:31" (1/1) ... [2021-12-18 20:19:31,054 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:19:31" (1/1) ... [2021-12-18 20:19:31,061 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:19:31" (1/1) ... [2021-12-18 20:19:31,063 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:19:31" (1/1) ... [2021-12-18 20:19:31,065 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:19:31" (1/1) ... [2021-12-18 20:19:31,067 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-18 20:19:31,068 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-18 20:19:31,068 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-18 20:19:31,068 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-18 20:19:31,068 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:19:31" (1/1) ... [2021-12-18 20:19:31,080 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-18 20:19:31,088 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:19:31,102 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) [2021-12-18 20:19:31,110 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 [2021-12-18 20:19:31,136 INFO L130 BoogieDeclarations]: Found specification of procedure list_add_tail [2021-12-18 20:19:31,136 INFO L138 BoogieDeclarations]: Found implementation of procedure list_add_tail [2021-12-18 20:19:31,136 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-18 20:19:31,136 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-18 20:19:31,136 INFO L130 BoogieDeclarations]: Found specification of procedure create_sub_list [2021-12-18 20:19:31,137 INFO L138 BoogieDeclarations]: Found implementation of procedure create_sub_list [2021-12-18 20:19:31,137 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-18 20:19:31,137 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-12-18 20:19:31,137 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-12-18 20:19:31,137 INFO L130 BoogieDeclarations]: Found specification of procedure destroy_sub [2021-12-18 20:19:31,137 INFO L138 BoogieDeclarations]: Found implementation of procedure destroy_sub [2021-12-18 20:19:31,137 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-12-18 20:19:31,137 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-18 20:19:31,138 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-12-18 20:19:31,138 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-12-18 20:19:31,138 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-18 20:19:31,138 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-18 20:19:31,254 INFO L236 CfgBuilder]: Building ICFG [2021-12-18 20:19:31,272 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-18 20:19:31,567 INFO L277 CfgBuilder]: Performing block encoding [2021-12-18 20:19:31,572 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-18 20:19:31,572 INFO L301 CfgBuilder]: Removed 4 assume(true) statements. [2021-12-18 20:19:31,573 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.12 08:19:31 BoogieIcfgContainer [2021-12-18 20:19:31,573 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-18 20:19:31,574 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-18 20:19:31,574 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-18 20:19:31,576 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-18 20:19:31,577 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.12 08:19:30" (1/3) ... [2021-12-18 20:19:31,577 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@59f07f40 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.12 08:19:31, skipping insertion in model container [2021-12-18 20:19:31,577 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:19:31" (2/3) ... [2021-12-18 20:19:31,578 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@59f07f40 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.12 08:19:31, skipping insertion in model container [2021-12-18 20:19:31,578 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.12 08:19:31" (3/3) ... [2021-12-18 20:19:31,579 INFO L111 eAbstractionObserver]: Analyzing ICFG test-0102-1.i [2021-12-18 20:19:31,582 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-18 20:19:31,583 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 31 error locations. [2021-12-18 20:19:31,612 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-18 20:19:31,622 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-18 20:19:31,623 INFO L340 AbstractCegarLoop]: Starting to check reachability of 31 error locations. [2021-12-18 20:19:31,633 INFO L276 IsEmpty]: Start isEmpty. Operand has 87 states, 46 states have (on average 1.891304347826087) internal successors, (87), 77 states have internal predecessors, (87), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-18 20:19:31,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-12-18 20:19:31,638 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:19:31,638 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-12-18 20:19:31,639 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [create_sub_listErr0REQUIRES_VIOLATION, create_sub_listErr1REQUIRES_VIOLATION, create_sub_listErr2REQUIRES_VIOLATION, create_sub_listErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-18 20:19:31,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:19:31,651 INFO L85 PathProgramCache]: Analyzing trace with hash 106012329, now seen corresponding path program 1 times [2021-12-18 20:19:31,659 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:19:31,660 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1394824000] [2021-12-18 20:19:31,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:19:31,661 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:19:31,661 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:19:31,663 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:19:31,664 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-12-18 20:19:31,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:19:31,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 1 conjunts are in the unsatisfiable core [2021-12-18 20:19:31,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:19:31,806 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:19:31,806 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:19:31,806 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:19:31,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1394824000] [2021-12-18 20:19:31,807 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1394824000] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:19:31,807 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:19:31,807 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-18 20:19:31,809 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959033863] [2021-12-18 20:19:31,815 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:19:31,818 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-18 20:19:31,818 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:19:31,834 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-18 20:19:31,834 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-18 20:19:31,836 INFO L87 Difference]: Start difference. First operand has 87 states, 46 states have (on average 1.891304347826087) internal successors, (87), 77 states have internal predecessors, (87), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 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) [2021-12-18 20:19:31,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:19:31,870 INFO L93 Difference]: Finished difference Result 87 states and 93 transitions. [2021-12-18 20:19:31,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-18 20:19:31,871 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 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 5 [2021-12-18 20:19:31,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:19:31,876 INFO L225 Difference]: With dead ends: 87 [2021-12-18 20:19:31,876 INFO L226 Difference]: Without dead ends: 85 [2021-12-18 20:19:31,877 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-18 20:19:31,881 INFO L933 BasicCegarLoop]: 93 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-18 20:19:31,882 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-18 20:19:31,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-12-18 20:19:31,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2021-12-18 20:19:31,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 45 states have (on average 1.7555555555555555) internal successors, (79), 75 states have internal predecessors, (79), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-18 20:19:31,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 91 transitions. [2021-12-18 20:19:31,907 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 91 transitions. Word has length 5 [2021-12-18 20:19:31,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:19:31,907 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 91 transitions. [2021-12-18 20:19:31,907 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 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) [2021-12-18 20:19:31,907 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 91 transitions. [2021-12-18 20:19:31,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-12-18 20:19:31,907 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:19:31,908 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:19:31,918 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-12-18 20:19:32,113 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:19:32,114 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting create_sub_listErr0REQUIRES_VIOLATION === [create_sub_listErr0REQUIRES_VIOLATION, create_sub_listErr1REQUIRES_VIOLATION, create_sub_listErr2REQUIRES_VIOLATION, create_sub_listErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-18 20:19:32,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:19:32,115 INFO L85 PathProgramCache]: Analyzing trace with hash -1219357814, now seen corresponding path program 1 times [2021-12-18 20:19:32,116 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:19:32,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [50416083] [2021-12-18 20:19:32,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:19:32,116 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:19:32,117 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:19:32,118 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:19:32,119 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-12-18 20:19:32,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:19:32,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-18 20:19:32,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:19:32,252 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:19:32,295 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:19:32,296 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:19:32,296 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:19:32,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [50416083] [2021-12-18 20:19:32,296 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [50416083] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:19:32,297 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:19:32,297 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-18 20:19:32,297 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807239503] [2021-12-18 20:19:32,297 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:19:32,298 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-18 20:19:32,298 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:19:32,298 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-18 20:19:32,298 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-18 20:19:32,298 INFO L87 Difference]: Start difference. First operand 85 states and 91 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:19:32,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:19:32,523 INFO L93 Difference]: Finished difference Result 91 states and 99 transitions. [2021-12-18 20:19:32,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-18 20:19:32,523 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-12-18 20:19:32,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:19:32,525 INFO L225 Difference]: With dead ends: 91 [2021-12-18 20:19:32,525 INFO L226 Difference]: Without dead ends: 91 [2021-12-18 20:19:32,525 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-18 20:19:32,526 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 39 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 190 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:19:32,527 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 190 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-18 20:19:32,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-12-18 20:19:32,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 83. [2021-12-18 20:19:32,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 45 states have (on average 1.711111111111111) internal successors, (77), 73 states have internal predecessors, (77), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-18 20:19:32,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 89 transitions. [2021-12-18 20:19:32,542 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 89 transitions. Word has length 7 [2021-12-18 20:19:32,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:19:32,542 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 89 transitions. [2021-12-18 20:19:32,542 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:19:32,542 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 89 transitions. [2021-12-18 20:19:32,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-12-18 20:19:32,543 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:19:32,543 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:19:32,551 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-12-18 20:19:32,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:19:32,752 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting create_sub_listErr1REQUIRES_VIOLATION === [create_sub_listErr0REQUIRES_VIOLATION, create_sub_listErr1REQUIRES_VIOLATION, create_sub_listErr2REQUIRES_VIOLATION, create_sub_listErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-18 20:19:32,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:19:32,752 INFO L85 PathProgramCache]: Analyzing trace with hash -1219357813, now seen corresponding path program 1 times [2021-12-18 20:19:32,752 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:19:32,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [487006209] [2021-12-18 20:19:32,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:19:32,753 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:19:32,753 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:19:32,754 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:19:32,756 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-12-18 20:19:32,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:19:32,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-18 20:19:32,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:19:32,824 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:19:32,874 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:19:32,874 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:19:32,874 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:19:32,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [487006209] [2021-12-18 20:19:32,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [487006209] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:19:32,875 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:19:32,875 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-18 20:19:32,875 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634727808] [2021-12-18 20:19:32,875 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:19:32,885 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-18 20:19:32,885 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:19:32,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-18 20:19:32,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-18 20:19:32,886 INFO L87 Difference]: Start difference. First operand 83 states and 89 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:19:33,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:19:33,030 INFO L93 Difference]: Finished difference Result 87 states and 93 transitions. [2021-12-18 20:19:33,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-18 20:19:33,031 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-12-18 20:19:33,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:19:33,032 INFO L225 Difference]: With dead ends: 87 [2021-12-18 20:19:33,032 INFO L226 Difference]: Without dead ends: 87 [2021-12-18 20:19:33,032 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-18 20:19:33,033 INFO L933 BasicCegarLoop]: 84 mSDtfsCounter, 5 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 256 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 20:19:33,033 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 256 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-18 20:19:33,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-12-18 20:19:33,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2021-12-18 20:19:33,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 48 states have (on average 1.6666666666666667) internal successors, (80), 75 states have internal predecessors, (80), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-18 20:19:33,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 92 transitions. [2021-12-18 20:19:33,039 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 92 transitions. Word has length 7 [2021-12-18 20:19:33,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:19:33,039 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 92 transitions. [2021-12-18 20:19:33,039 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:19:33,040 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 92 transitions. [2021-12-18 20:19:33,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-18 20:19:33,040 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:19:33,040 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:19:33,048 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Ended with exit code 0 [2021-12-18 20:19:33,246 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:19:33,246 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting create_sub_listErr4REQUIRES_VIOLATION === [create_sub_listErr0REQUIRES_VIOLATION, create_sub_listErr1REQUIRES_VIOLATION, create_sub_listErr2REQUIRES_VIOLATION, create_sub_listErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-18 20:19:33,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:19:33,247 INFO L85 PathProgramCache]: Analyzing trace with hash -778231822, now seen corresponding path program 1 times [2021-12-18 20:19:33,247 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:19:33,247 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [933111902] [2021-12-18 20:19:33,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:19:33,248 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:19:33,248 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:19:33,249 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:19:33,249 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-12-18 20:19:33,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:19:33,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-18 20:19:33,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:19:33,321 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:19:33,332 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:19:33,332 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:19:33,332 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:19:33,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [933111902] [2021-12-18 20:19:33,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [933111902] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:19:33,333 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:19:33,333 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-18 20:19:33,333 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313073876] [2021-12-18 20:19:33,333 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:19:33,333 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-18 20:19:33,333 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:19:33,334 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-18 20:19:33,334 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:19:33,334 INFO L87 Difference]: Start difference. First operand 86 states and 92 transitions. Second operand has 3 states, 2 states have (on average 5.0) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:19:33,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:19:33,403 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2021-12-18 20:19:33,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-18 20:19:33,404 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.0) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-12-18 20:19:33,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:19:33,404 INFO L225 Difference]: With dead ends: 86 [2021-12-18 20:19:33,404 INFO L226 Difference]: Without dead ends: 86 [2021-12-18 20:19:33,405 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:19:33,405 INFO L933 BasicCegarLoop]: 85 mSDtfsCounter, 6 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 20:19:33,405 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 132 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-18 20:19:33,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-12-18 20:19:33,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2021-12-18 20:19:33,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 48 states have (on average 1.6458333333333333) internal successors, (79), 74 states have internal predecessors, (79), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-18 20:19:33,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 91 transitions. [2021-12-18 20:19:33,409 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 91 transitions. Word has length 11 [2021-12-18 20:19:33,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:19:33,409 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 91 transitions. [2021-12-18 20:19:33,409 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.0) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:19:33,409 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 91 transitions. [2021-12-18 20:19:33,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-18 20:19:33,409 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:19:33,410 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:19:33,422 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-12-18 20:19:33,622 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:19:33,622 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting create_sub_listErr5REQUIRES_VIOLATION === [create_sub_listErr0REQUIRES_VIOLATION, create_sub_listErr1REQUIRES_VIOLATION, create_sub_listErr2REQUIRES_VIOLATION, create_sub_listErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-18 20:19:33,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:19:33,623 INFO L85 PathProgramCache]: Analyzing trace with hash -778231821, now seen corresponding path program 1 times [2021-12-18 20:19:33,623 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:19:33,623 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [206525038] [2021-12-18 20:19:33,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:19:33,623 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:19:33,623 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:19:33,628 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:19:33,631 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-12-18 20:19:33,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:19:33,696 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-18 20:19:33,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:19:33,717 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:19:33,732 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:19:33,732 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:19:33,732 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:19:33,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [206525038] [2021-12-18 20:19:33,732 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [206525038] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:19:33,733 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:19:33,733 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-18 20:19:33,733 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [501383307] [2021-12-18 20:19:33,733 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:19:33,733 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-18 20:19:33,733 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:19:33,734 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-18 20:19:33,734 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:19:33,734 INFO L87 Difference]: Start difference. First operand 85 states and 91 transitions. Second operand has 3 states, 2 states have (on average 5.0) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:19:33,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:19:33,803 INFO L93 Difference]: Finished difference Result 85 states and 91 transitions. [2021-12-18 20:19:33,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-18 20:19:33,804 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.0) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-12-18 20:19:33,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:19:33,805 INFO L225 Difference]: With dead ends: 85 [2021-12-18 20:19:33,805 INFO L226 Difference]: Without dead ends: 85 [2021-12-18 20:19:33,805 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:19:33,805 INFO L933 BasicCegarLoop]: 85 mSDtfsCounter, 5 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 20:19:33,806 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 136 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-18 20:19:33,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-12-18 20:19:33,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 84. [2021-12-18 20:19:33,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 48 states have (on average 1.625) internal successors, (78), 73 states have internal predecessors, (78), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-18 20:19:33,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 90 transitions. [2021-12-18 20:19:33,811 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 90 transitions. Word has length 11 [2021-12-18 20:19:33,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:19:33,811 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 90 transitions. [2021-12-18 20:19:33,811 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.0) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:19:33,811 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 90 transitions. [2021-12-18 20:19:33,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-12-18 20:19:33,812 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:19:33,812 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:19:33,818 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-12-18 20:19:34,018 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:19:34,019 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting list_add_tailErr1REQUIRES_VIOLATION === [create_sub_listErr0REQUIRES_VIOLATION, create_sub_listErr1REQUIRES_VIOLATION, create_sub_listErr2REQUIRES_VIOLATION, create_sub_listErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-18 20:19:34,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:19:34,019 INFO L85 PathProgramCache]: Analyzing trace with hash -70636768, now seen corresponding path program 1 times [2021-12-18 20:19:34,019 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:19:34,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1780160017] [2021-12-18 20:19:34,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:19:34,020 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:19:34,020 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:19:34,020 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:19:34,021 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-12-18 20:19:34,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:19:34,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-18 20:19:34,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:19:34,129 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:19:34,134 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:19:34,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:19:34,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:19:34,225 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:19:34,225 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:19:34,277 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:19:34,277 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:19:34,278 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:19:34,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1780160017] [2021-12-18 20:19:34,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1780160017] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:19:34,278 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:19:34,278 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-18 20:19:34,278 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510964145] [2021-12-18 20:19:34,278 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:19:34,279 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-18 20:19:34,279 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:19:34,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-18 20:19:34,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-12-18 20:19:34,280 INFO L87 Difference]: Start difference. First operand 84 states and 90 transitions. Second operand has 8 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:19:34,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:19:34,640 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2021-12-18 20:19:34,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-18 20:19:34,641 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-12-18 20:19:34,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:19:34,641 INFO L225 Difference]: With dead ends: 112 [2021-12-18 20:19:34,642 INFO L226 Difference]: Without dead ends: 112 [2021-12-18 20:19:34,642 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-12-18 20:19:34,642 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 54 mSDsluCounter, 264 mSDsCounter, 0 mSdLazyCounter, 281 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 332 SdHoareTripleChecker+Invalid, 287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 281 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-18 20:19:34,642 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 332 Invalid, 287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 281 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-18 20:19:34,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-12-18 20:19:34,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 102. [2021-12-18 20:19:34,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 63 states have (on average 1.6349206349206349) internal successors, (103), 89 states have internal predecessors, (103), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-18 20:19:34,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 117 transitions. [2021-12-18 20:19:34,647 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 117 transitions. Word has length 14 [2021-12-18 20:19:34,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:19:34,647 INFO L470 AbstractCegarLoop]: Abstraction has 102 states and 117 transitions. [2021-12-18 20:19:34,647 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:19:34,647 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 117 transitions. [2021-12-18 20:19:34,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-12-18 20:19:34,648 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:19:34,648 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:19:34,657 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Ended with exit code 0 [2021-12-18 20:19:34,855 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:19:34,855 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting list_add_tailErr0REQUIRES_VIOLATION === [create_sub_listErr0REQUIRES_VIOLATION, create_sub_listErr1REQUIRES_VIOLATION, create_sub_listErr2REQUIRES_VIOLATION, create_sub_listErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-18 20:19:34,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:19:34,856 INFO L85 PathProgramCache]: Analyzing trace with hash -70636769, now seen corresponding path program 1 times [2021-12-18 20:19:34,856 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:19:34,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [5367669] [2021-12-18 20:19:34,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:19:34,856 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:19:34,856 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:19:34,857 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:19:34,858 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-12-18 20:19:34,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:19:34,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-18 20:19:34,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:19:34,976 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:19:35,020 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-18 20:19:35,021 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 20 [2021-12-18 20:19:35,065 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:19:35,065 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:19:35,065 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:19:35,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [5367669] [2021-12-18 20:19:35,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [5367669] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:19:35,066 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:19:35,066 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-18 20:19:35,066 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697037973] [2021-12-18 20:19:35,066 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:19:35,067 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-18 20:19:35,067 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:19:35,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-18 20:19:35,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-12-18 20:19:35,067 INFO L87 Difference]: Start difference. First operand 102 states and 117 transitions. Second operand has 8 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:19:35,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:19:35,449 INFO L93 Difference]: Finished difference Result 131 states and 146 transitions. [2021-12-18 20:19:35,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-18 20:19:35,450 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-12-18 20:19:35,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:19:35,451 INFO L225 Difference]: With dead ends: 131 [2021-12-18 20:19:35,451 INFO L226 Difference]: Without dead ends: 131 [2021-12-18 20:19:35,451 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-12-18 20:19:35,451 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 87 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 282 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 282 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-18 20:19:35,451 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 278 Invalid, 291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 282 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-18 20:19:35,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-12-18 20:19:35,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 112. [2021-12-18 20:19:35,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 72 states have (on average 1.6666666666666667) internal successors, (120), 98 states have internal predecessors, (120), 7 states have call successors, (7), 6 states have call predecessors, (7), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-18 20:19:35,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 134 transitions. [2021-12-18 20:19:35,456 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 134 transitions. Word has length 14 [2021-12-18 20:19:35,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:19:35,456 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 134 transitions. [2021-12-18 20:19:35,456 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:19:35,456 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 134 transitions. [2021-12-18 20:19:35,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-12-18 20:19:35,457 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:19:35,457 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:19:35,464 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Ended with exit code 0 [2021-12-18 20:19:35,664 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:19:35,665 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting list_add_tailErr2REQUIRES_VIOLATION === [create_sub_listErr0REQUIRES_VIOLATION, create_sub_listErr1REQUIRES_VIOLATION, create_sub_listErr2REQUIRES_VIOLATION, create_sub_listErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-18 20:19:35,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:19:35,665 INFO L85 PathProgramCache]: Analyzing trace with hash 837542848, now seen corresponding path program 1 times [2021-12-18 20:19:35,665 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:19:35,665 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [710594602] [2021-12-18 20:19:35,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:19:35,665 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:19:35,666 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:19:35,666 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:19:35,667 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-12-18 20:19:35,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:19:35,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-18 20:19:35,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:19:35,770 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:19:35,771 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:19:35,771 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:19:35,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [710594602] [2021-12-18 20:19:35,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [710594602] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:19:35,771 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:19:35,771 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-18 20:19:35,771 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [362257951] [2021-12-18 20:19:35,772 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:19:35,772 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-18 20:19:35,772 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:19:35,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-18 20:19:35,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-18 20:19:35,773 INFO L87 Difference]: Start difference. First operand 112 states and 134 transitions. Second operand has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 1 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:19:35,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:19:35,884 INFO L93 Difference]: Finished difference Result 111 states and 131 transitions. [2021-12-18 20:19:35,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-18 20:19:35,885 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 1 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-12-18 20:19:35,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:19:35,885 INFO L225 Difference]: With dead ends: 111 [2021-12-18 20:19:35,885 INFO L226 Difference]: Without dead ends: 111 [2021-12-18 20:19:35,885 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-12-18 20:19:35,886 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 27 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 20:19:35,886 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 169 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-18 20:19:35,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-12-18 20:19:35,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2021-12-18 20:19:35,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 72 states have (on average 1.625) internal successors, (117), 97 states have internal predecessors, (117), 7 states have call successors, (7), 6 states have call predecessors, (7), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-18 20:19:35,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 131 transitions. [2021-12-18 20:19:35,890 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 131 transitions. Word has length 16 [2021-12-18 20:19:35,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:19:35,891 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 131 transitions. [2021-12-18 20:19:35,891 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 1 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:19:35,891 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 131 transitions. [2021-12-18 20:19:35,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-12-18 20:19:35,892 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:19:35,892 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:19:35,900 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-12-18 20:19:36,099 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:19:36,099 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting list_add_tailErr3REQUIRES_VIOLATION === [create_sub_listErr0REQUIRES_VIOLATION, create_sub_listErr1REQUIRES_VIOLATION, create_sub_listErr2REQUIRES_VIOLATION, create_sub_listErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-18 20:19:36,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:19:36,100 INFO L85 PathProgramCache]: Analyzing trace with hash 837542849, now seen corresponding path program 1 times [2021-12-18 20:19:36,100 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:19:36,100 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [378756997] [2021-12-18 20:19:36,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:19:36,100 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:19:36,100 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:19:36,104 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:19:36,104 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-12-18 20:19:36,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:19:36,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-18 20:19:36,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:19:36,288 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:19:36,288 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:19:36,288 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:19:36,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [378756997] [2021-12-18 20:19:36,288 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [378756997] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:19:36,288 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:19:36,288 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-12-18 20:19:36,288 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [159189645] [2021-12-18 20:19:36,288 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:19:36,289 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-18 20:19:36,289 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:19:36,289 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-18 20:19:36,289 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-12-18 20:19:36,289 INFO L87 Difference]: Start difference. First operand 111 states and 131 transitions. Second operand has 10 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:19:36,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:19:36,525 INFO L93 Difference]: Finished difference Result 119 states and 132 transitions. [2021-12-18 20:19:36,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-18 20:19:36,526 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-12-18 20:19:36,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:19:36,527 INFO L225 Difference]: With dead ends: 119 [2021-12-18 20:19:36,527 INFO L226 Difference]: Without dead ends: 119 [2021-12-18 20:19:36,527 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2021-12-18 20:19:36,527 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 97 mSDsluCounter, 464 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 535 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:19:36,528 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [102 Valid, 535 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-18 20:19:36,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-12-18 20:19:36,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 111. [2021-12-18 20:19:36,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 72 states have (on average 1.6111111111111112) internal successors, (116), 97 states have internal predecessors, (116), 7 states have call successors, (7), 6 states have call predecessors, (7), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-18 20:19:36,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 130 transitions. [2021-12-18 20:19:36,532 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 130 transitions. Word has length 16 [2021-12-18 20:19:36,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:19:36,532 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 130 transitions. [2021-12-18 20:19:36,532 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:19:36,532 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 130 transitions. [2021-12-18 20:19:36,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-12-18 20:19:36,532 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:19:36,532 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:19:36,543 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-12-18 20:19:36,733 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:19:36,733 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting list_add_tailErr4REQUIRES_VIOLATION === [create_sub_listErr0REQUIRES_VIOLATION, create_sub_listErr1REQUIRES_VIOLATION, create_sub_listErr2REQUIRES_VIOLATION, create_sub_listErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-18 20:19:36,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:19:36,733 INFO L85 PathProgramCache]: Analyzing trace with hash 194024551, now seen corresponding path program 1 times [2021-12-18 20:19:36,734 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:19:36,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [153314528] [2021-12-18 20:19:36,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:19:36,734 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:19:36,734 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:19:36,735 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:19:36,740 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-12-18 20:19:36,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:19:36,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-18 20:19:36,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:19:36,838 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:19:36,870 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:19:36,871 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:19:36,871 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:19:36,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [153314528] [2021-12-18 20:19:36,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [153314528] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:19:36,871 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:19:36,871 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-18 20:19:36,872 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1736597840] [2021-12-18 20:19:36,872 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:19:36,872 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-18 20:19:36,872 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:19:36,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-18 20:19:36,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-18 20:19:36,873 INFO L87 Difference]: Start difference. First operand 111 states and 130 transitions. Second operand has 6 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:19:37,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:19:37,073 INFO L93 Difference]: Finished difference Result 118 states and 127 transitions. [2021-12-18 20:19:37,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-18 20:19:37,074 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-12-18 20:19:37,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:19:37,074 INFO L225 Difference]: With dead ends: 118 [2021-12-18 20:19:37,075 INFO L226 Difference]: Without dead ends: 118 [2021-12-18 20:19:37,075 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-12-18 20:19:37,075 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 49 mSDsluCounter, 179 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:19:37,075 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 251 Invalid, 164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 161 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-18 20:19:37,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-12-18 20:19:37,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 110. [2021-12-18 20:19:37,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 72 states have (on average 1.5416666666666667) internal successors, (111), 96 states have internal predecessors, (111), 7 states have call successors, (7), 6 states have call predecessors, (7), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-18 20:19:37,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 125 transitions. [2021-12-18 20:19:37,078 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 125 transitions. Word has length 17 [2021-12-18 20:19:37,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:19:37,079 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 125 transitions. [2021-12-18 20:19:37,079 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:19:37,079 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 125 transitions. [2021-12-18 20:19:37,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-12-18 20:19:37,079 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:19:37,079 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:19:37,086 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-12-18 20:19:37,286 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:19:37,286 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting list_add_tailErr5REQUIRES_VIOLATION === [create_sub_listErr0REQUIRES_VIOLATION, create_sub_listErr1REQUIRES_VIOLATION, create_sub_listErr2REQUIRES_VIOLATION, create_sub_listErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-18 20:19:37,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:19:37,287 INFO L85 PathProgramCache]: Analyzing trace with hash 194024552, now seen corresponding path program 1 times [2021-12-18 20:19:37,287 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:19:37,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2061204243] [2021-12-18 20:19:37,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:19:37,287 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:19:37,287 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:19:37,288 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:19:37,290 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-12-18 20:19:37,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:19:37,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-18 20:19:37,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:19:37,398 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:19:37,460 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:19:37,460 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:19:37,460 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:19:37,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2061204243] [2021-12-18 20:19:37,461 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2061204243] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:19:37,461 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:19:37,461 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-18 20:19:37,461 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [977750776] [2021-12-18 20:19:37,461 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:19:37,461 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-18 20:19:37,461 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:19:37,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-18 20:19:37,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-18 20:19:37,462 INFO L87 Difference]: Start difference. First operand 110 states and 125 transitions. Second operand has 6 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:19:37,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:19:37,706 INFO L93 Difference]: Finished difference Result 116 states and 123 transitions. [2021-12-18 20:19:37,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-18 20:19:37,707 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-12-18 20:19:37,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:19:37,708 INFO L225 Difference]: With dead ends: 116 [2021-12-18 20:19:37,708 INFO L226 Difference]: Without dead ends: 116 [2021-12-18 20:19:37,708 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-12-18 20:19:37,709 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 36 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 271 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:19:37,709 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 271 Invalid, 150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-18 20:19:37,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-12-18 20:19:37,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 110. [2021-12-18 20:19:37,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 72 states have (on average 1.4861111111111112) internal successors, (107), 96 states have internal predecessors, (107), 7 states have call successors, (7), 6 states have call predecessors, (7), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-18 20:19:37,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 121 transitions. [2021-12-18 20:19:37,712 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 121 transitions. Word has length 17 [2021-12-18 20:19:37,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:19:37,712 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 121 transitions. [2021-12-18 20:19:37,712 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:19:37,712 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 121 transitions. [2021-12-18 20:19:37,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-12-18 20:19:37,712 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:19:37,712 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:19:37,725 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-12-18 20:19:37,923 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:19:37,923 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting list_add_tailErr8REQUIRES_VIOLATION === [create_sub_listErr0REQUIRES_VIOLATION, create_sub_listErr1REQUIRES_VIOLATION, create_sub_listErr2REQUIRES_VIOLATION, create_sub_listErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-18 20:19:37,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:19:37,924 INFO L85 PathProgramCache]: Analyzing trace with hash 1774001130, now seen corresponding path program 1 times [2021-12-18 20:19:37,924 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:19:37,924 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [808964739] [2021-12-18 20:19:37,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:19:37,924 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:19:37,924 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:19:37,925 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:19:37,927 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-12-18 20:19:38,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:19:38,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 28 conjunts are in the unsatisfiable core [2021-12-18 20:19:38,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:19:38,071 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:19:38,100 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 [2021-12-18 20:19:38,137 INFO L354 Elim1Store]: treesize reduction 23, result has 28.1 percent of original size [2021-12-18 20:19:38,137 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 1 case distinctions, treesize of input 21 treesize of output 20 [2021-12-18 20:19:38,156 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:19:38,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:19:38,185 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 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:19:38,251 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 19 treesize of output 7 [2021-12-18 20:19:38,282 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:19:38,282 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:19:38,282 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:19:38,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [808964739] [2021-12-18 20:19:38,282 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [808964739] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:19:38,282 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:19:38,282 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-12-18 20:19:38,283 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094903843] [2021-12-18 20:19:38,283 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:19:38,283 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-18 20:19:38,283 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:19:38,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-18 20:19:38,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2021-12-18 20:19:38,283 INFO L87 Difference]: Start difference. First operand 110 states and 121 transitions. Second operand has 12 states, 10 states have (on average 1.7) internal successors, (17), 10 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:19:38,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:19:38,892 INFO L93 Difference]: Finished difference Result 145 states and 161 transitions. [2021-12-18 20:19:38,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-12-18 20:19:38,893 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 1.7) internal successors, (17), 10 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-12-18 20:19:38,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:19:38,894 INFO L225 Difference]: With dead ends: 145 [2021-12-18 20:19:38,894 INFO L226 Difference]: Without dead ends: 145 [2021-12-18 20:19:38,894 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=73, Invalid=307, Unknown=0, NotChecked=0, Total=380 [2021-12-18 20:19:38,894 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 57 mSDsluCounter, 384 mSDsCounter, 0 mSdLazyCounter, 387 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 443 SdHoareTripleChecker+Invalid, 406 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 387 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-18 20:19:38,895 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 443 Invalid, 406 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 387 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-18 20:19:38,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2021-12-18 20:19:38,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 132. [2021-12-18 20:19:38,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 92 states have (on average 1.423913043478261) internal successors, (131), 116 states have internal predecessors, (131), 9 states have call successors, (9), 8 states have call predecessors, (9), 6 states have return successors, (9), 7 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-18 20:19:38,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 149 transitions. [2021-12-18 20:19:38,898 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 149 transitions. Word has length 19 [2021-12-18 20:19:38,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:19:38,899 INFO L470 AbstractCegarLoop]: Abstraction has 132 states and 149 transitions. [2021-12-18 20:19:38,899 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 1.7) internal successors, (17), 10 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:19:38,899 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 149 transitions. [2021-12-18 20:19:38,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-12-18 20:19:38,899 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:19:38,900 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:19:38,909 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-12-18 20:19:39,107 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:19:39,107 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting list_add_tailErr9REQUIRES_VIOLATION === [create_sub_listErr0REQUIRES_VIOLATION, create_sub_listErr1REQUIRES_VIOLATION, create_sub_listErr2REQUIRES_VIOLATION, create_sub_listErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-18 20:19:39,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:19:39,108 INFO L85 PathProgramCache]: Analyzing trace with hash 1774001131, now seen corresponding path program 1 times [2021-12-18 20:19:39,108 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:19:39,108 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1124166694] [2021-12-18 20:19:39,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:19:39,108 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:19:39,108 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:19:39,109 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:19:39,109 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-12-18 20:19:39,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:19:39,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 46 conjunts are in the unsatisfiable core [2021-12-18 20:19:39,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:19:39,284 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:19:39,289 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:19:39,345 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 [2021-12-18 20:19:39,353 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 [2021-12-18 20:19:39,393 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:19:39,394 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 0 case distinctions, treesize of input 21 treesize of output 20 [2021-12-18 20:19:39,400 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:19:39,401 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 0 case distinctions, treesize of input 21 treesize of output 20 [2021-12-18 20:19:39,423 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:19:39,424 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:19:39,434 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:19:39,488 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 0 case distinctions, treesize of input 14 treesize of output 16 [2021-12-18 20:19:39,496 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 0 case distinctions, treesize of input 14 treesize of output 16 [2021-12-18 20:19:39,609 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 [2021-12-18 20:19:39,612 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 [2021-12-18 20:19:39,663 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:19:39,663 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:19:39,663 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:19:39,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1124166694] [2021-12-18 20:19:39,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1124166694] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:19:39,663 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:19:39,663 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-12-18 20:19:39,663 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187093126] [2021-12-18 20:19:39,663 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:19:39,663 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-18 20:19:39,663 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:19:39,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-18 20:19:39,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2021-12-18 20:19:39,664 INFO L87 Difference]: Start difference. First operand 132 states and 149 transitions. Second operand has 12 states, 10 states have (on average 1.7) internal successors, (17), 10 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:19:40,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:19:40,431 INFO L93 Difference]: Finished difference Result 135 states and 150 transitions. [2021-12-18 20:19:40,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-12-18 20:19:40,431 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 1.7) internal successors, (17), 10 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-12-18 20:19:40,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:19:40,432 INFO L225 Difference]: With dead ends: 135 [2021-12-18 20:19:40,432 INFO L226 Difference]: Without dead ends: 135 [2021-12-18 20:19:40,433 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=73, Invalid=307, Unknown=0, NotChecked=0, Total=380 [2021-12-18 20:19:40,433 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 30 mSDsluCounter, 438 mSDsCounter, 0 mSdLazyCounter, 440 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 509 SdHoareTripleChecker+Invalid, 456 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-18 20:19:40,433 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 509 Invalid, 456 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 440 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-18 20:19:40,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-12-18 20:19:40,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2021-12-18 20:19:40,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 94 states have (on average 1.4042553191489362) internal successors, (132), 119 states have internal predecessors, (132), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (9), 7 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-18 20:19:40,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 150 transitions. [2021-12-18 20:19:40,437 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 150 transitions. Word has length 19 [2021-12-18 20:19:40,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:19:40,437 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 150 transitions. [2021-12-18 20:19:40,437 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 1.7) internal successors, (17), 10 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:19:40,438 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 150 transitions. [2021-12-18 20:19:40,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-18 20:19:40,440 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:19:40,441 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:19:40,452 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-12-18 20:19:40,649 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:19:40,649 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting create_sub_listErr1REQUIRES_VIOLATION === [create_sub_listErr0REQUIRES_VIOLATION, create_sub_listErr1REQUIRES_VIOLATION, create_sub_listErr2REQUIRES_VIOLATION, create_sub_listErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-18 20:19:40,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:19:40,649 INFO L85 PathProgramCache]: Analyzing trace with hash 1031850971, now seen corresponding path program 1 times [2021-12-18 20:19:40,650 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:19:40,650 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1640289679] [2021-12-18 20:19:40,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:19:40,650 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:19:40,650 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:19:40,651 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:19:40,652 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-12-18 20:19:40,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:19:40,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-18 20:19:40,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:19:40,816 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:19:40,824 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:19:42,915 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:19:42,976 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:19:42,976 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:19:42,984 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:19:42,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:19:43,034 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:19:43,034 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:19:43,394 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:19:43,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1640289679] [2021-12-18 20:19:43,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1640289679] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:19:43,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1800400108] [2021-12-18 20:19:43,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:19:43,394 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 20:19:43,395 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 20:19:43,409 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 20:19:43,426 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-12-18 20:19:43,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:19:43,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 35 conjunts are in the unsatisfiable core [2021-12-18 20:19:43,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:19:43,730 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:19:43,734 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:19:43,893 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:19:44,150 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:19:44,151 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:19:44,158 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:19:44,158 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:19:44,181 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:19:44,181 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:19:44,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1800400108] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:19:44,692 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:19:44,692 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 12] total 13 [2021-12-18 20:19:44,692 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1358879563] [2021-12-18 20:19:44,692 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:19:44,693 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-12-18 20:19:44,693 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:19:44,693 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-12-18 20:19:44,693 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=295, Unknown=1, NotChecked=0, Total=342 [2021-12-18 20:19:44,694 INFO L87 Difference]: Start difference. First operand 135 states and 150 transitions. Second operand has 14 states, 12 states have (on average 3.5) internal successors, (42), 12 states have internal predecessors, (42), 4 states have call successors, (4), 3 states have call predecessors, (4), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-18 20:19:55,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:19:55,526 INFO L93 Difference]: Finished difference Result 163 states and 184 transitions. [2021-12-18 20:19:55,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-18 20:19:55,527 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 3.5) internal successors, (42), 12 states have internal predecessors, (42), 4 states have call successors, (4), 3 states have call predecessors, (4), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 29 [2021-12-18 20:19:55,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:19:55,528 INFO L225 Difference]: With dead ends: 163 [2021-12-18 20:19:55,528 INFO L226 Difference]: Without dead ends: 163 [2021-12-18 20:19:55,528 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=78, Invalid=468, Unknown=6, NotChecked=0, Total=552 [2021-12-18 20:19:55,528 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 78 mSDsluCounter, 290 mSDsCounter, 0 mSdLazyCounter, 450 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 343 SdHoareTripleChecker+Invalid, 595 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 450 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 136 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-18 20:19:55,529 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [78 Valid, 343 Invalid, 595 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 450 Invalid, 0 Unknown, 136 Unchecked, 0.6s Time] [2021-12-18 20:19:55,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2021-12-18 20:19:55,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 143. [2021-12-18 20:19:55,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 100 states have (on average 1.39) internal successors, (139), 124 states have internal predecessors, (139), 10 states have call successors, (10), 9 states have call predecessors, (10), 8 states have return successors, (11), 9 states have call predecessors, (11), 10 states have call successors, (11) [2021-12-18 20:19:55,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 160 transitions. [2021-12-18 20:19:55,534 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 160 transitions. Word has length 29 [2021-12-18 20:19:55,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:19:55,534 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 160 transitions. [2021-12-18 20:19:55,534 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 3.5) internal successors, (42), 12 states have internal predecessors, (42), 4 states have call successors, (4), 3 states have call predecessors, (4), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-18 20:19:55,534 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 160 transitions. [2021-12-18 20:19:55,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-12-18 20:19:55,537 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:19:55,537 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:19:55,544 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (16)] Ended with exit code 0 [2021-12-18 20:19:55,749 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-12-18 20:19:55,941 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:19:55,941 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting list_add_tailErr1REQUIRES_VIOLATION === [create_sub_listErr0REQUIRES_VIOLATION, create_sub_listErr1REQUIRES_VIOLATION, create_sub_listErr2REQUIRES_VIOLATION, create_sub_listErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-18 20:19:55,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:19:55,941 INFO L85 PathProgramCache]: Analyzing trace with hash 343570640, now seen corresponding path program 1 times [2021-12-18 20:19:55,942 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:19:55,942 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1041287337] [2021-12-18 20:19:55,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:19:55,942 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:19:55,942 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:19:55,943 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:19:55,945 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-12-18 20:19:56,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:19:56,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 37 conjunts are in the unsatisfiable core [2021-12-18 20:19:56,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:19:56,212 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:19:56,218 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:19:56,342 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:19:56,463 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:19:56,463 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:19:56,472 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:19:56,472 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:19:56,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:19:56,561 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:19:56,569 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:19:56,569 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:19:56,656 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:19:56,656 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:20:01,511 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:20:01,512 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 14 [2021-12-18 20:20:02,195 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:20:02,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1041287337] [2021-12-18 20:20:02,195 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1041287337] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:20:02,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [903595554] [2021-12-18 20:20:02,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:20:02,195 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 20:20:02,196 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 20:20:02,196 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 20:20:02,197 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-12-18 20:20:02,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:20:02,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 39 conjunts are in the unsatisfiable core [2021-12-18 20:20:02,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:20:02,587 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:20:02,593 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:20:02,708 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:20:02,856 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:20:02,857 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:20:02,866 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:20:02,866 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:20:02,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:20:02,939 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:20:02,948 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:20:02,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:20:02,988 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:20:02,988 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:20:03,606 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:20:03,606 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 14 [2021-12-18 20:20:06,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [903595554] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:20:06,055 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:20:06,055 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 14 [2021-12-18 20:20:06,055 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725155013] [2021-12-18 20:20:06,055 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:20:06,055 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-18 20:20:06,055 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:20:06,056 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-18 20:20:06,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=407, Unknown=3, NotChecked=0, Total=462 [2021-12-18 20:20:06,056 INFO L87 Difference]: Start difference. First operand 143 states and 160 transitions. Second operand has 15 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 12 states have internal predecessors, (32), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:20:07,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:20:07,488 INFO L93 Difference]: Finished difference Result 178 states and 199 transitions. [2021-12-18 20:20:07,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-12-18 20:20:07,489 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 12 states have internal predecessors, (32), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 36 [2021-12-18 20:20:07,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:20:07,490 INFO L225 Difference]: With dead ends: 178 [2021-12-18 20:20:07,490 INFO L226 Difference]: Without dead ends: 178 [2021-12-18 20:20:07,490 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 65 SyntacticMatches, 8 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=122, Invalid=805, Unknown=3, NotChecked=0, Total=930 [2021-12-18 20:20:07,491 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 98 mSDsluCounter, 290 mSDsCounter, 0 mSdLazyCounter, 637 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 347 SdHoareTripleChecker+Invalid, 823 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 637 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 177 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-12-18 20:20:07,491 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 347 Invalid, 823 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 637 Invalid, 0 Unknown, 177 Unchecked, 0.9s Time] [2021-12-18 20:20:07,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2021-12-18 20:20:07,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 157. [2021-12-18 20:20:07,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 112 states have (on average 1.3660714285714286) internal successors, (153), 137 states have internal predecessors, (153), 11 states have call successors, (11), 10 states have call predecessors, (11), 9 states have return successors, (12), 9 states have call predecessors, (12), 11 states have call successors, (12) [2021-12-18 20:20:07,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 176 transitions. [2021-12-18 20:20:07,504 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 176 transitions. Word has length 36 [2021-12-18 20:20:07,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:20:07,504 INFO L470 AbstractCegarLoop]: Abstraction has 157 states and 176 transitions. [2021-12-18 20:20:07,505 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 12 states have internal predecessors, (32), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:20:07,505 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 176 transitions. [2021-12-18 20:20:07,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-12-18 20:20:07,507 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:20:07,507 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:20:07,517 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-12-18 20:20:07,721 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Forceful destruction successful, exit code 0 [2021-12-18 20:20:07,917 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2021-12-18 20:20:07,917 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting list_add_tailErr8REQUIRES_VIOLATION === [create_sub_listErr0REQUIRES_VIOLATION, create_sub_listErr1REQUIRES_VIOLATION, create_sub_listErr2REQUIRES_VIOLATION, create_sub_listErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-18 20:20:07,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:20:07,917 INFO L85 PathProgramCache]: Analyzing trace with hash 2012582842, now seen corresponding path program 1 times [2021-12-18 20:20:07,917 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:20:07,918 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [634792354] [2021-12-18 20:20:07,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:20:07,918 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:20:07,918 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:20:07,919 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:20:07,919 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-12-18 20:20:08,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:20:08,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 75 conjunts are in the unsatisfiable core [2021-12-18 20:20:08,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:20:08,290 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:20:08,335 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 [2021-12-18 20:20:08,342 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 [2021-12-18 20:20:08,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:20:08,386 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 0 case distinctions, treesize of input 21 treesize of output 20 [2021-12-18 20:20:08,393 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:20:08,394 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 0 case distinctions, treesize of input 21 treesize of output 20 [2021-12-18 20:20:08,434 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:20:08,435 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 20 treesize of output 27 [2021-12-18 20:20:08,539 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 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:20:08,551 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 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:20:08,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-12-18 20:20:08,602 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-12-18 20:20:09,700 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 65 treesize of output 36 [2021-12-18 20:20:09,743 INFO L354 Elim1Store]: treesize reduction 46, result has 19.3 percent of original size [2021-12-18 20:20:09,744 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 97 treesize of output 90 [2021-12-18 20:20:09,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:20:09,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 94 treesize of output 74 [2021-12-18 20:20:09,757 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 42 treesize of output 24 [2021-12-18 20:20:09,767 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 22 [2021-12-18 20:20:09,984 INFO L354 Elim1Store]: treesize reduction 42, result has 44.0 percent of original size [2021-12-18 20:20:09,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 31 treesize of output 52 [2021-12-18 20:20:10,118 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 0 case distinctions, treesize of input 36 treesize of output 34 [2021-12-18 20:20:10,314 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 29 treesize of output 17 [2021-12-18 20:20:10,492 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:20:10,492 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:20:11,002 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_create_sub_list_insert_sub_~sub~0#1.base_24| (_ BitVec 32)) (v_ArrVal_812 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_811 (_ BitVec 1))) (or (not (= (_ bv0 1) (select |c_#valid| |v_create_sub_list_insert_sub_~sub~0#1.base_24|))) (= (_ bv0 1) (bvadd (select (store |c_#valid| |v_create_sub_list_insert_sub_~sub~0#1.base_24| v_ArrVal_811) (select (select (store |c_#memory_$Pointer$.base| |v_create_sub_list_insert_sub_~sub~0#1.base_24| v_ArrVal_812) |c_create_sub_list_~sub#1.base|) (bvadd |c_create_sub_list_~sub#1.offset| (_ bv4 32)))) (_ bv1 1))))) is different from false [2021-12-18 20:20:11,822 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:20:11,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [634792354] [2021-12-18 20:20:11,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [634792354] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:20:11,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [240649779] [2021-12-18 20:20:11,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:20:11,822 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 20:20:11,822 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 20:20:11,823 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 20:20:11,826 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2021-12-18 20:20:12,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:20:12,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 79 conjunts are in the unsatisfiable core [2021-12-18 20:20:12,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:20:12,375 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:20:12,405 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 [2021-12-18 20:20:12,410 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 [2021-12-18 20:20:12,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:20:12,431 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 0 case distinctions, treesize of input 21 treesize of output 20 [2021-12-18 20:20:12,439 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:20:12,439 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 0 case distinctions, treesize of input 21 treesize of output 20 [2021-12-18 20:20:12,488 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:20:12,489 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 20 treesize of output 27 [2021-12-18 20:20:12,535 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 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:20:12,551 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 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:20:12,583 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-12-18 20:20:12,587 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-12-18 20:20:13,290 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 65 treesize of output 36 [2021-12-18 20:20:13,329 INFO L354 Elim1Store]: treesize reduction 46, result has 19.3 percent of original size [2021-12-18 20:20:13,330 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 97 treesize of output 90 [2021-12-18 20:20:13,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:20:13,337 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 94 treesize of output 74 [2021-12-18 20:20:13,345 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 42 treesize of output 24 [2021-12-18 20:20:13,367 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 30 [2021-12-18 20:20:13,456 INFO L354 Elim1Store]: treesize reduction 42, result has 44.0 percent of original size [2021-12-18 20:20:13,456 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 31 treesize of output 52 [2021-12-18 20:20:13,499 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 0 case distinctions, treesize of input 36 treesize of output 34 [2021-12-18 20:20:13,547 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 29 treesize of output 17 [2021-12-18 20:20:13,710 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:20:13,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:20:13,854 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_create_sub_list_insert_sub_~sub~0#1.base_26| (_ BitVec 32)) (v_ArrVal_933 (_ BitVec 1)) (v_ArrVal_812 (Array (_ BitVec 32) (_ BitVec 32)))) (or (not (= (_ bv0 1) (select |c_#valid| |v_create_sub_list_insert_sub_~sub~0#1.base_26|))) (= (_ bv0 1) (bvadd (select (store |c_#valid| |v_create_sub_list_insert_sub_~sub~0#1.base_26| v_ArrVal_933) (select (select (store |c_#memory_$Pointer$.base| |v_create_sub_list_insert_sub_~sub~0#1.base_26| v_ArrVal_812) |c_create_sub_list_~sub#1.base|) (bvadd |c_create_sub_list_~sub#1.offset| (_ bv4 32)))) (_ bv1 1))))) is different from false [2021-12-18 20:20:14,652 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [240649779] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:20:14,652 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:20:14,652 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2021-12-18 20:20:14,652 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [756925410] [2021-12-18 20:20:14,652 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:20:14,652 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-12-18 20:20:14,652 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:20:14,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-12-18 20:20:14,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=783, Unknown=15, NotChecked=114, Total=992 [2021-12-18 20:20:14,653 INFO L87 Difference]: Start difference. First operand 157 states and 176 transitions. Second operand has 23 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 20 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-18 20:20:15,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:20:15,704 INFO L93 Difference]: Finished difference Result 168 states and 189 transitions. [2021-12-18 20:20:15,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-12-18 20:20:15,705 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 20 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-12-18 20:20:15,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:20:15,705 INFO L225 Difference]: With dead ends: 168 [2021-12-18 20:20:15,706 INFO L226 Difference]: Without dead ends: 168 [2021-12-18 20:20:15,706 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 55 SyntacticMatches, 11 SemanticMatches, 38 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 250 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=146, Invalid=1250, Unknown=18, NotChecked=146, Total=1560 [2021-12-18 20:20:15,706 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 29 mSDsluCounter, 659 mSDsCounter, 0 mSdLazyCounter, 301 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 733 SdHoareTripleChecker+Invalid, 858 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 301 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 542 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-18 20:20:15,706 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 733 Invalid, 858 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 301 Invalid, 0 Unknown, 542 Unchecked, 0.5s Time] [2021-12-18 20:20:15,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-12-18 20:20:15,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2021-12-18 20:20:15,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 122 states have (on average 1.3442622950819672) internal successors, (164), 147 states have internal predecessors, (164), 12 states have call successors, (12), 11 states have call predecessors, (12), 9 states have return successors, (13), 9 states have call predecessors, (13), 12 states have call successors, (13) [2021-12-18 20:20:15,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 189 transitions. [2021-12-18 20:20:15,714 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 189 transitions. Word has length 35 [2021-12-18 20:20:15,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:20:15,714 INFO L470 AbstractCegarLoop]: Abstraction has 168 states and 189 transitions. [2021-12-18 20:20:15,715 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 20 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-18 20:20:15,715 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 189 transitions. [2021-12-18 20:20:15,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-12-18 20:20:15,716 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:20:15,716 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:20:15,722 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (20)] Forceful destruction successful, exit code 0 [2021-12-18 20:20:15,929 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-12-18 20:20:16,120 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:20:16,120 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting list_add_tailErr9REQUIRES_VIOLATION === [create_sub_listErr0REQUIRES_VIOLATION, create_sub_listErr1REQUIRES_VIOLATION, create_sub_listErr2REQUIRES_VIOLATION, create_sub_listErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-18 20:20:16,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:20:16,121 INFO L85 PathProgramCache]: Analyzing trace with hash 2012582843, now seen corresponding path program 1 times [2021-12-18 20:20:16,121 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:20:16,121 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [166232998] [2021-12-18 20:20:16,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:20:16,121 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:20:16,121 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:20:16,122 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:20:16,124 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-12-18 20:20:16,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:20:16,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 95 conjunts are in the unsatisfiable core [2021-12-18 20:20:16,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:20:16,583 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:20:16,635 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 [2021-12-18 20:20:16,643 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 [2021-12-18 20:20:16,675 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:20:16,677 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 0 case distinctions, treesize of input 21 treesize of output 20 [2021-12-18 20:20:16,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:20:16,687 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 0 case distinctions, treesize of input 21 treesize of output 20 [2021-12-18 20:20:16,714 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:20:16,743 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:20:16,744 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 20 treesize of output 27 [2021-12-18 20:20:16,861 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 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:20:16,871 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 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:20:16,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-12-18 20:20:16,898 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-12-18 20:20:18,537 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 120 treesize of output 79 [2021-12-18 20:20:18,543 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 100 treesize of output 71 [2021-12-18 20:20:18,581 INFO L354 Elim1Store]: treesize reduction 34, result has 24.4 percent of original size [2021-12-18 20:20:18,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 125 treesize of output 112 [2021-12-18 20:20:18,586 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:20:18,587 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 116 treesize of output 84 [2021-12-18 20:20:18,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:20:18,597 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 0 case distinctions, treesize of input 30 treesize of output 27 [2021-12-18 20:20:18,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:20:18,606 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 20 [2021-12-18 20:20:18,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 30 [2021-12-18 20:20:18,851 INFO L354 Elim1Store]: treesize reduction 8, result has 61.9 percent of original size [2021-12-18 20:20:18,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 25 treesize of output 27 [2021-12-18 20:20:18,862 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:20:18,970 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 0 case distinctions, treesize of input 32 treesize of output 30 [2021-12-18 20:20:18,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-12-18 20:20:19,227 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 [2021-12-18 20:20:19,230 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 25 treesize of output 13 [2021-12-18 20:20:19,409 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:20:19,409 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:20:20,336 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_1064 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse0 (select (select (store |c_#memory_$Pointer$.offset| |c_create_sub_list_insert_sub_~sub~0#1.base| v_ArrVal_1064) |c_create_sub_list_insert_sub_~head#1.base|) (bvadd |c_create_sub_list_insert_sub_~head#1.offset| (_ bv4 32))))) (bvule .cse0 (bvadd .cse0 (_ bv4 32))))) (forall ((v_ArrVal_1063 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_1064 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse1 (bvadd |c_create_sub_list_insert_sub_~head#1.offset| (_ bv4 32)))) (bvule (bvadd (select (select (store |c_#memory_$Pointer$.offset| |c_create_sub_list_insert_sub_~sub~0#1.base| v_ArrVal_1064) |c_create_sub_list_insert_sub_~head#1.base|) .cse1) (_ bv4 32)) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| |c_create_sub_list_insert_sub_~sub~0#1.base| v_ArrVal_1063) |c_create_sub_list_insert_sub_~head#1.base|) .cse1)))))) is different from false [2021-12-18 20:20:20,425 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_create_sub_list_insert_sub_~sub~0#1.base_28| (_ BitVec 32))) (or (and (forall ((v_ArrVal_1063 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_1064 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_1062 (_ BitVec 32))) (let ((.cse0 (bvadd |c_create_sub_list_~sub#1.offset| (_ bv4 32)))) (bvule (bvadd (select (select (store |c_#memory_$Pointer$.offset| |v_create_sub_list_insert_sub_~sub~0#1.base_28| v_ArrVal_1064) |c_create_sub_list_~sub#1.base|) .cse0) (_ bv4 32)) (select (store |c_#length| |v_create_sub_list_insert_sub_~sub~0#1.base_28| v_ArrVal_1062) (select (select (store |c_#memory_$Pointer$.base| |v_create_sub_list_insert_sub_~sub~0#1.base_28| v_ArrVal_1063) |c_create_sub_list_~sub#1.base|) .cse0))))) (forall ((v_ArrVal_1064 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse1 (select (select (store |c_#memory_$Pointer$.offset| |v_create_sub_list_insert_sub_~sub~0#1.base_28| v_ArrVal_1064) |c_create_sub_list_~sub#1.base|) (bvadd |c_create_sub_list_~sub#1.offset| (_ bv4 32))))) (bvule .cse1 (bvadd .cse1 (_ bv4 32)))))) (not (= (_ bv0 1) (select |c_#valid| |v_create_sub_list_insert_sub_~sub~0#1.base_28|))))) is different from false [2021-12-18 20:20:25,295 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:20:25,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [166232998] [2021-12-18 20:20:25,296 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [166232998] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:20:25,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1549467130] [2021-12-18 20:20:25,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:20:25,296 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 20:20:25,296 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 20:20:25,297 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 20:20:25,298 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-12-18 20:20:26,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:20:26,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 99 conjunts are in the unsatisfiable core [2021-12-18 20:20:26,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:20:26,189 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:20:26,226 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 [2021-12-18 20:20:26,235 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 [2021-12-18 20:20:26,264 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:20:26,265 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 0 case distinctions, treesize of input 21 treesize of output 20 [2021-12-18 20:20:26,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:20:26,273 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 0 case distinctions, treesize of input 21 treesize of output 20 [2021-12-18 20:20:26,328 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:20:26,329 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 20 treesize of output 27 [2021-12-18 20:20:26,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:20:26,428 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 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:20:26,440 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 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:20:26,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-12-18 20:20:26,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-12-18 20:20:29,657 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 120 treesize of output 91 [2021-12-18 20:20:29,664 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:20:29,668 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 27 [2021-12-18 20:20:29,677 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 86 treesize of output 45 [2021-12-18 20:20:29,713 INFO L354 Elim1Store]: treesize reduction 34, result has 24.4 percent of original size [2021-12-18 20:20:29,713 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 96 treesize of output 87 [2021-12-18 20:20:29,719 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:20:29,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 67 [2021-12-18 20:20:29,727 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:20:29,728 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 20 [2021-12-18 20:20:29,738 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 22 [2021-12-18 20:20:29,952 INFO L354 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2021-12-18 20:20:29,952 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 26 [2021-12-18 20:20:29,982 INFO L354 Elim1Store]: treesize reduction 8, result has 61.9 percent of original size [2021-12-18 20:20:29,983 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 25 treesize of output 27 [2021-12-18 20:20:30,091 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-12-18 20:20:30,095 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 0 case distinctions, treesize of input 32 treesize of output 30 [2021-12-18 20:20:30,132 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 [2021-12-18 20:20:30,137 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 25 treesize of output 13 [2021-12-18 20:20:30,318 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:20:30,319 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:20:30,412 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_1204 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse0 (select (select (store |c_#memory_$Pointer$.offset| |c_create_sub_list_insert_sub_~sub~0#1.base| v_ArrVal_1204) |c_create_sub_list_insert_sub_~head#1.base|) (bvadd |c_create_sub_list_insert_sub_~head#1.offset| (_ bv4 32))))) (bvule .cse0 (bvadd .cse0 (_ bv4 32))))) (forall ((v_ArrVal_1203 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_1204 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse1 (bvadd |c_create_sub_list_insert_sub_~head#1.offset| (_ bv4 32)))) (bvule (bvadd (select (select (store |c_#memory_$Pointer$.offset| |c_create_sub_list_insert_sub_~sub~0#1.base| v_ArrVal_1204) |c_create_sub_list_insert_sub_~head#1.base|) .cse1) (_ bv4 32)) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| |c_create_sub_list_insert_sub_~sub~0#1.base| v_ArrVal_1203) |c_create_sub_list_insert_sub_~head#1.base|) .cse1)))))) is different from false [2021-12-18 20:20:30,508 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_create_sub_list_insert_sub_~sub~0#1.base_30| (_ BitVec 32))) (or (and (forall ((v_ArrVal_1204 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse0 (select (select (store |c_#memory_$Pointer$.offset| |v_create_sub_list_insert_sub_~sub~0#1.base_30| v_ArrVal_1204) |c_create_sub_list_~sub#1.base|) (bvadd |c_create_sub_list_~sub#1.offset| (_ bv4 32))))) (bvule .cse0 (bvadd .cse0 (_ bv4 32))))) (forall ((v_ArrVal_1202 (_ BitVec 32)) (v_ArrVal_1203 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_1204 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse1 (bvadd |c_create_sub_list_~sub#1.offset| (_ bv4 32)))) (bvule (bvadd (select (select (store |c_#memory_$Pointer$.offset| |v_create_sub_list_insert_sub_~sub~0#1.base_30| v_ArrVal_1204) |c_create_sub_list_~sub#1.base|) .cse1) (_ bv4 32)) (select (store |c_#length| |v_create_sub_list_insert_sub_~sub~0#1.base_30| v_ArrVal_1202) (select (select (store |c_#memory_$Pointer$.base| |v_create_sub_list_insert_sub_~sub~0#1.base_30| v_ArrVal_1203) |c_create_sub_list_~sub#1.base|) .cse1)))))) (not (= (_ bv0 1) (select |c_#valid| |v_create_sub_list_insert_sub_~sub~0#1.base_30|))))) is different from false [2021-12-18 20:20:35,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1549467130] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:20:35,482 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:20:35,482 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 28 [2021-12-18 20:20:35,482 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425899670] [2021-12-18 20:20:35,482 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:20:35,482 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-12-18 20:20:35,482 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:20:35,483 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-12-18 20:20:35,483 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1148, Unknown=21, NotChecked=284, Total=1560 [2021-12-18 20:20:35,483 INFO L87 Difference]: Start difference. First operand 168 states and 189 transitions. Second operand has 29 states, 27 states have (on average 1.5185185185185186) internal successors, (41), 26 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-18 20:20:39,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:20:39,928 INFO L93 Difference]: Finished difference Result 171 states and 190 transitions. [2021-12-18 20:20:39,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-12-18 20:20:39,929 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 27 states have (on average 1.5185185185185186) internal successors, (41), 26 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 35 [2021-12-18 20:20:39,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:20:39,930 INFO L225 Difference]: With dead ends: 171 [2021-12-18 20:20:39,930 INFO L226 Difference]: Without dead ends: 171 [2021-12-18 20:20:39,930 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 52 SyntacticMatches, 6 SemanticMatches, 48 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 434 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=182, Invalid=1883, Unknown=21, NotChecked=364, Total=2450 [2021-12-18 20:20:39,931 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 38 mSDsluCounter, 674 mSDsCounter, 0 mSdLazyCounter, 388 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 750 SdHoareTripleChecker+Invalid, 863 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 388 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 458 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-18 20:20:39,931 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 750 Invalid, 863 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 388 Invalid, 0 Unknown, 458 Unchecked, 0.7s Time] [2021-12-18 20:20:39,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2021-12-18 20:20:39,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 171. [2021-12-18 20:20:39,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 124 states have (on average 1.3306451612903225) internal successors, (165), 150 states have internal predecessors, (165), 12 states have call successors, (12), 11 states have call predecessors, (12), 10 states have return successors, (13), 9 states have call predecessors, (13), 12 states have call successors, (13) [2021-12-18 20:20:39,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 190 transitions. [2021-12-18 20:20:39,935 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 190 transitions. Word has length 35 [2021-12-18 20:20:39,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:20:39,935 INFO L470 AbstractCegarLoop]: Abstraction has 171 states and 190 transitions. [2021-12-18 20:20:39,935 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 27 states have (on average 1.5185185185185186) internal successors, (41), 26 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-18 20:20:39,935 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 190 transitions. [2021-12-18 20:20:39,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-12-18 20:20:39,936 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:20:39,936 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:20:39,951 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-12-18 20:20:40,158 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-12-18 20:20:40,348 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:20:40,349 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting list_add_tailErr3REQUIRES_VIOLATION === [create_sub_listErr0REQUIRES_VIOLATION, create_sub_listErr1REQUIRES_VIOLATION, create_sub_listErr2REQUIRES_VIOLATION, create_sub_listErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-18 20:20:40,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:20:40,349 INFO L85 PathProgramCache]: Analyzing trace with hash -541096591, now seen corresponding path program 1 times [2021-12-18 20:20:40,350 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:20:40,350 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1825528894] [2021-12-18 20:20:40,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:20:40,350 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:20:40,350 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:20:40,351 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:20:40,352 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-12-18 20:20:40,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:20:40,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-18 20:20:40,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:20:40,645 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:20:40,645 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:20:40,645 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:20:40,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1825528894] [2021-12-18 20:20:40,645 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1825528894] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:20:40,645 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:20:40,646 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-12-18 20:20:40,646 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690292828] [2021-12-18 20:20:40,646 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:20:40,646 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-18 20:20:40,646 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:20:40,646 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-18 20:20:40,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-12-18 20:20:40,646 INFO L87 Difference]: Start difference. First operand 171 states and 190 transitions. Second operand has 10 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 8 states have internal predecessors, (32), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:20:41,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:20:41,072 INFO L93 Difference]: Finished difference Result 175 states and 188 transitions. [2021-12-18 20:20:41,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-18 20:20:41,078 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 8 states have internal predecessors, (32), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 38 [2021-12-18 20:20:41,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:20:41,079 INFO L225 Difference]: With dead ends: 175 [2021-12-18 20:20:41,079 INFO L226 Difference]: Without dead ends: 175 [2021-12-18 20:20:41,080 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2021-12-18 20:20:41,080 INFO L933 BasicCegarLoop]: 91 mSDtfsCounter, 78 mSDsluCounter, 600 mSDsCounter, 0 mSdLazyCounter, 191 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 691 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 191 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-18 20:20:41,080 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 691 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 191 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-18 20:20:41,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2021-12-18 20:20:41,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 171. [2021-12-18 20:20:41,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 124 states have (on average 1.3064516129032258) internal successors, (162), 150 states have internal predecessors, (162), 12 states have call successors, (12), 11 states have call predecessors, (12), 10 states have return successors, (13), 9 states have call predecessors, (13), 12 states have call successors, (13) [2021-12-18 20:20:41,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 187 transitions. [2021-12-18 20:20:41,085 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 187 transitions. Word has length 38 [2021-12-18 20:20:41,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:20:41,085 INFO L470 AbstractCegarLoop]: Abstraction has 171 states and 187 transitions. [2021-12-18 20:20:41,086 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 8 states have internal predecessors, (32), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:20:41,086 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 187 transitions. [2021-12-18 20:20:41,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-12-18 20:20:41,087 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:20:41,087 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:20:41,095 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (23)] Ended with exit code 0 [2021-12-18 20:20:41,295 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:20:41,295 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting list_add_tailErr9REQUIRES_VIOLATION === [create_sub_listErr0REQUIRES_VIOLATION, create_sub_listErr1REQUIRES_VIOLATION, create_sub_listErr2REQUIRES_VIOLATION, create_sub_listErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-18 20:20:41,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:20:41,296 INFO L85 PathProgramCache]: Analyzing trace with hash -796271557, now seen corresponding path program 1 times [2021-12-18 20:20:41,296 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:20:41,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [737291046] [2021-12-18 20:20:41,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:20:41,296 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:20:41,296 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:20:41,297 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:20:41,298 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-12-18 20:20:41,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:20:41,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 74 conjunts are in the unsatisfiable core [2021-12-18 20:20:41,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:20:41,660 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:20:41,665 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:20:41,724 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 [2021-12-18 20:20:41,768 INFO L354 Elim1Store]: treesize reduction 23, result has 28.1 percent of original size [2021-12-18 20:20:41,769 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 1 case distinctions, treesize of input 21 treesize of output 20 [2021-12-18 20:20:41,882 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:20:41,883 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 1 case distinctions, treesize of input 16 treesize of output 22 [2021-12-18 20:20:41,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-12-18 20:20:42,024 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:20:42,145 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 13 treesize of output 7 [2021-12-18 20:20:42,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:20:42,271 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:20:42,281 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:20:42,281 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:20:42,400 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 [2021-12-18 20:20:42,407 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 [2021-12-18 20:20:42,472 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:20:42,474 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 0 case distinctions, treesize of input 21 treesize of output 20 [2021-12-18 20:20:42,481 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:20:42,482 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 0 case distinctions, treesize of input 21 treesize of output 20 [2021-12-18 20:20:42,512 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:20:42,513 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 18 [2021-12-18 20:20:42,529 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:20:42,530 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:20:42,633 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 0 case distinctions, treesize of input 14 treesize of output 16 [2021-12-18 20:20:42,638 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 0 case distinctions, treesize of input 14 treesize of output 16 [2021-12-18 20:20:42,783 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 [2021-12-18 20:20:42,790 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 [2021-12-18 20:20:42,892 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:20:42,892 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:20:43,505 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_1434 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_1435 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse0 (bvadd |c_create_sub_list_insert_sub_~head#1.offset| (_ bv4 32)))) (bvule (bvadd (select (select (store |c_#memory_$Pointer$.offset| |c_create_sub_list_insert_sub_~sub~0#1.base| v_ArrVal_1435) |c_create_sub_list_insert_sub_~head#1.base|) .cse0) (_ bv4 32)) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| |c_create_sub_list_insert_sub_~sub~0#1.base| v_ArrVal_1434) |c_create_sub_list_insert_sub_~head#1.base|) .cse0))))) (forall ((v_ArrVal_1435 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse1 (select (select (store |c_#memory_$Pointer$.offset| |c_create_sub_list_insert_sub_~sub~0#1.base| v_ArrVal_1435) |c_create_sub_list_insert_sub_~head#1.base|) (bvadd |c_create_sub_list_insert_sub_~head#1.offset| (_ bv4 32))))) (bvule .cse1 (bvadd .cse1 (_ bv4 32)))))) is different from false [2021-12-18 20:20:49,322 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_create_sub_list_insert_sub_~sub~0#1.base_32| (_ BitVec 32))) (or (and (forall ((v_ArrVal_1429 (_ BitVec 32)) (v_ArrVal_1435 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse0 (select (select (store (store |c_#memory_$Pointer$.offset| |c_create_sub_list_~sub#1.base| (store (select |c_#memory_$Pointer$.offset| |c_create_sub_list_~sub#1.base|) |c_create_sub_list_~sub#1.offset| v_ArrVal_1429)) |v_create_sub_list_insert_sub_~sub~0#1.base_32| v_ArrVal_1435) |c_create_sub_list_~sub#1.base|) (bvadd |c_create_sub_list_~sub#1.offset| (_ bv4 32))))) (bvule .cse0 (bvadd .cse0 (_ bv4 32))))) (forall ((v_ArrVal_1433 (_ BitVec 32)) (v_ArrVal_1432 (_ BitVec 32)) (v_ArrVal_1434 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_1429 (_ BitVec 32)) (v_ArrVal_1435 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse1 (bvadd |c_create_sub_list_~sub#1.offset| (_ bv4 32)))) (bvule (bvadd (select (select (store (store |c_#memory_$Pointer$.offset| |c_create_sub_list_~sub#1.base| (store (select |c_#memory_$Pointer$.offset| |c_create_sub_list_~sub#1.base|) |c_create_sub_list_~sub#1.offset| v_ArrVal_1429)) |v_create_sub_list_insert_sub_~sub~0#1.base_32| v_ArrVal_1435) |c_create_sub_list_~sub#1.base|) .cse1) (_ bv4 32)) (select (store |c_#length| |v_create_sub_list_insert_sub_~sub~0#1.base_32| v_ArrVal_1433) (select (select (store (store |c_#memory_$Pointer$.base| |c_create_sub_list_~sub#1.base| (store (select |c_#memory_$Pointer$.base| |c_create_sub_list_~sub#1.base|) |c_create_sub_list_~sub#1.offset| v_ArrVal_1432)) |v_create_sub_list_insert_sub_~sub~0#1.base_32| v_ArrVal_1434) |c_create_sub_list_~sub#1.base|) .cse1)))))) (not (= (_ bv0 1) (select |c_#valid| |v_create_sub_list_insert_sub_~sub~0#1.base_32|))))) is different from false [2021-12-18 20:20:49,386 INFO L354 Elim1Store]: treesize reduction 23, result has 45.2 percent of original size [2021-12-18 20:20:49,386 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 1 new quantified variables, introduced 2 case distinctions, treesize of input 104 treesize of output 110 [2021-12-18 20:20:49,405 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-12-18 20:20:49,405 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 153 treesize of output 137 [2021-12-18 20:20:49,495 INFO L354 Elim1Store]: treesize reduction 46, result has 44.6 percent of original size [2021-12-18 20:20:49,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 137 treesize of output 121 [2021-12-18 20:20:49,511 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-12-18 20:20:49,511 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 167 treesize of output 145 [2021-12-18 20:20:49,530 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-12-18 20:20:49,530 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 162 treesize of output 140 [2021-12-18 20:20:49,536 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 115 treesize of output 107 [2021-12-18 20:20:49,541 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 107 treesize of output 99 [2021-12-18 20:20:49,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 99 treesize of output 91 [2021-12-18 20:20:50,972 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:20:50,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 14 [2021-12-18 20:20:54,209 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:20:54,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [737291046] [2021-12-18 20:20:54,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [737291046] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:20:54,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [100653162] [2021-12-18 20:20:54,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:20:54,209 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 20:20:54,209 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 20:20:54,217 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 20:20:54,239 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-12-18 20:20:55,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:20:55,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 66 conjunts are in the unsatisfiable core [2021-12-18 20:20:55,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:20:55,888 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:20:55,893 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:20:56,131 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:20:56,404 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:20:56,405 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:20:56,415 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:20:56,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:20:56,481 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 [2021-12-18 20:20:56,500 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 [2021-12-18 20:20:56,519 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:20:56,520 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 0 case distinctions, treesize of input 21 treesize of output 20 [2021-12-18 20:20:56,528 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:20:56,528 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 0 case distinctions, treesize of input 21 treesize of output 20 [2021-12-18 20:20:56,554 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:20:56,555 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:20:56,570 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:20:56,603 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 0 case distinctions, treesize of input 14 treesize of output 16 [2021-12-18 20:20:56,609 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 0 case distinctions, treesize of input 14 treesize of output 16 [2021-12-18 20:20:56,661 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 [2021-12-18 20:20:56,668 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 [2021-12-18 20:20:56,801 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:20:56,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:20:56,915 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_1562 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_1561 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse0 (bvadd |c_create_sub_list_insert_sub_~head#1.offset| (_ bv4 32)))) (bvule (bvadd (select (select (store |c_#memory_$Pointer$.offset| |c_create_sub_list_insert_sub_~sub~0#1.base| v_ArrVal_1561) |c_create_sub_list_insert_sub_~head#1.base|) .cse0) (_ bv4 32)) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| |c_create_sub_list_insert_sub_~sub~0#1.base| v_ArrVal_1562) |c_create_sub_list_insert_sub_~head#1.base|) .cse0))))) (forall ((v_ArrVal_1561 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse1 (select (select (store |c_#memory_$Pointer$.offset| |c_create_sub_list_insert_sub_~sub~0#1.base| v_ArrVal_1561) |c_create_sub_list_insert_sub_~head#1.base|) (bvadd |c_create_sub_list_insert_sub_~head#1.offset| (_ bv4 32))))) (bvule .cse1 (bvadd .cse1 (_ bv4 32)))))) is different from false [2021-12-18 20:21:05,994 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_create_sub_list_insert_sub_~sub~0#1.base_36| (_ BitVec 32))) (or (not (= (_ bv0 1) (select |c_#valid| |v_create_sub_list_insert_sub_~sub~0#1.base_36|))) (and (forall ((v_ArrVal_1556 (_ BitVec 32)) (v_ArrVal_1558 (_ BitVec 32)) (v_ArrVal_1562 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_1561 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_1560 (_ BitVec 32))) (let ((.cse0 (bvadd |c_create_sub_list_~sub#1.offset| (_ bv4 32)))) (bvule (bvadd (select (select (store (store |c_#memory_$Pointer$.offset| |c_create_sub_list_~sub#1.base| (store (select |c_#memory_$Pointer$.offset| |c_create_sub_list_~sub#1.base|) |c_create_sub_list_~sub#1.offset| v_ArrVal_1558)) |v_create_sub_list_insert_sub_~sub~0#1.base_36| v_ArrVal_1561) |c_create_sub_list_~sub#1.base|) .cse0) (_ bv4 32)) (select (store |c_#length| |v_create_sub_list_insert_sub_~sub~0#1.base_36| v_ArrVal_1560) (select (select (store (store |c_#memory_$Pointer$.base| |c_create_sub_list_~sub#1.base| (store (select |c_#memory_$Pointer$.base| |c_create_sub_list_~sub#1.base|) |c_create_sub_list_~sub#1.offset| v_ArrVal_1556)) |v_create_sub_list_insert_sub_~sub~0#1.base_36| v_ArrVal_1562) |c_create_sub_list_~sub#1.base|) .cse0))))) (forall ((v_ArrVal_1558 (_ BitVec 32)) (v_ArrVal_1561 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse1 (select (select (store (store |c_#memory_$Pointer$.offset| |c_create_sub_list_~sub#1.base| (store (select |c_#memory_$Pointer$.offset| |c_create_sub_list_~sub#1.base|) |c_create_sub_list_~sub#1.offset| v_ArrVal_1558)) |v_create_sub_list_insert_sub_~sub~0#1.base_36| v_ArrVal_1561) |c_create_sub_list_~sub#1.base|) (bvadd |c_create_sub_list_~sub#1.offset| (_ bv4 32))))) (bvule .cse1 (bvadd .cse1 (_ bv4 32)))))))) is different from false [2021-12-18 20:21:06,052 INFO L354 Elim1Store]: treesize reduction 23, result has 45.2 percent of original size [2021-12-18 20:21:06,053 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 1 new quantified variables, introduced 2 case distinctions, treesize of input 104 treesize of output 110 [2021-12-18 20:21:06,067 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-12-18 20:21:06,067 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 153 treesize of output 137 [2021-12-18 20:21:06,141 INFO L354 Elim1Store]: treesize reduction 46, result has 44.6 percent of original size [2021-12-18 20:21:06,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 137 treesize of output 121 [2021-12-18 20:21:06,155 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-12-18 20:21:06,155 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 167 treesize of output 145 [2021-12-18 20:21:06,180 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-12-18 20:21:06,180 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 162 treesize of output 140 [2021-12-18 20:21:06,190 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 115 treesize of output 107 [2021-12-18 20:21:06,194 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 107 treesize of output 99 [2021-12-18 20:21:06,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 99 treesize of output 91 [2021-12-18 20:21:10,750 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:21:10,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 14 [2021-12-18 20:21:11,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [100653162] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:21:11,609 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:21:11,609 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18] total 25 [2021-12-18 20:21:11,609 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205618979] [2021-12-18 20:21:11,609 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:21:11,609 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-12-18 20:21:11,610 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:21:11,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-12-18 20:21:11,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1213, Unknown=27, NotChecked=292, Total=1640 [2021-12-18 20:21:11,610 INFO L87 Difference]: Start difference. First operand 171 states and 187 transitions. Second operand has 26 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 22 states have internal predecessors, (45), 4 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-18 20:21:15,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:21:15,488 INFO L93 Difference]: Finished difference Result 193 states and 209 transitions. [2021-12-18 20:21:15,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-12-18 20:21:15,488 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 22 states have internal predecessors, (45), 4 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 41 [2021-12-18 20:21:15,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:21:15,489 INFO L225 Difference]: With dead ends: 193 [2021-12-18 20:21:15,489 INFO L226 Difference]: Without dead ends: 193 [2021-12-18 20:21:15,490 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 67 SyntacticMatches, 6 SemanticMatches, 58 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 573 ImplicationChecksByTransitivity, 26.8s TimeCoverageRelationStatistics Valid=322, Invalid=2747, Unknown=27, NotChecked=444, Total=3540 [2021-12-18 20:21:15,490 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 130 mSDsluCounter, 438 mSDsCounter, 0 mSdLazyCounter, 1067 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 493 SdHoareTripleChecker+Invalid, 1295 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 1067 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 198 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-12-18 20:21:15,491 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [130 Valid, 493 Invalid, 1295 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 1067 Invalid, 0 Unknown, 198 Unchecked, 1.7s Time] [2021-12-18 20:21:15,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-12-18 20:21:15,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 171. [2021-12-18 20:21:15,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 124 states have (on average 1.2983870967741935) internal successors, (161), 150 states have internal predecessors, (161), 12 states have call successors, (12), 11 states have call predecessors, (12), 10 states have return successors, (13), 9 states have call predecessors, (13), 12 states have call successors, (13) [2021-12-18 20:21:15,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 186 transitions. [2021-12-18 20:21:15,494 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 186 transitions. Word has length 41 [2021-12-18 20:21:15,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:21:15,494 INFO L470 AbstractCegarLoop]: Abstraction has 171 states and 186 transitions. [2021-12-18 20:21:15,495 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 22 states have internal predecessors, (45), 4 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-18 20:21:15,495 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 186 transitions. [2021-12-18 20:21:15,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-18 20:21:15,495 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:21:15,495 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:21:15,502 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2021-12-18 20:21:15,711 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-12-18 20:21:15,902 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:21:15,902 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting create_sub_listErr1REQUIRES_VIOLATION === [create_sub_listErr0REQUIRES_VIOLATION, create_sub_listErr1REQUIRES_VIOLATION, create_sub_listErr2REQUIRES_VIOLATION, create_sub_listErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-18 20:21:15,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:21:15,902 INFO L85 PathProgramCache]: Analyzing trace with hash 782352299, now seen corresponding path program 1 times [2021-12-18 20:21:15,902 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:21:15,903 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1897847380] [2021-12-18 20:21:15,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:21:15,903 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:21:15,903 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:21:15,904 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:21:15,904 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-12-18 20:21:16,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:21:16,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 29 conjunts are in the unsatisfiable core [2021-12-18 20:21:16,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:21:16,262 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:21:16,268 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:21:16,405 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:21:16,583 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:21:16,583 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2021-12-18 20:21:24,825 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:21:24,825 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 15 [2021-12-18 20:21:24,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-18 20:21:25,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:21:25,061 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:21:25,062 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 23 [2021-12-18 20:21:25,076 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:21:25,077 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:21:25,215 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:21:25,215 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:21:25,662 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:21:25,663 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 14 [2021-12-18 20:21:26,163 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:21:26,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1897847380] [2021-12-18 20:21:26,164 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1897847380] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:21:26,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [674723417] [2021-12-18 20:21:26,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:21:26,164 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 20:21:26,164 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 20:21:26,165 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 20:21:26,165 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-12-18 20:21:26,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:21:26,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 44 conjunts are in the unsatisfiable core [2021-12-18 20:21:26,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:21:26,696 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:21:26,700 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:21:31,017 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:21:33,217 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:21:33,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2021-12-18 20:21:33,505 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:21:33,506 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 15 [2021-12-18 20:21:33,517 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-18 20:21:34,212 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:21:34,243 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:21:34,244 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 23 [2021-12-18 20:21:34,266 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:21:34,267 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:21:34,369 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:21:34,369 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:21:35,138 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:21:35,139 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 14 [2021-12-18 20:21:36,831 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [674723417] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:21:36,831 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:21:36,831 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 17] total 21 [2021-12-18 20:21:36,833 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [498604019] [2021-12-18 20:21:36,833 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:21:36,834 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-12-18 20:21:36,834 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:21:36,834 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-12-18 20:21:36,834 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=626, Unknown=7, NotChecked=0, Total=702 [2021-12-18 20:21:36,835 INFO L87 Difference]: Start difference. First operand 171 states and 186 transitions. Second operand has 22 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 6 states have call successors, (6), 3 states have call predecessors, (6), 5 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-18 20:21:48,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:21:48,139 INFO L93 Difference]: Finished difference Result 207 states and 233 transitions. [2021-12-18 20:21:48,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-18 20:21:48,140 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 6 states have call successors, (6), 3 states have call predecessors, (6), 5 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 45 [2021-12-18 20:21:48,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:21:48,141 INFO L225 Difference]: With dead ends: 207 [2021-12-18 20:21:48,141 INFO L226 Difference]: Without dead ends: 207 [2021-12-18 20:21:48,141 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 27.0s TimeCoverageRelationStatistics Valid=109, Invalid=871, Unknown=12, NotChecked=0, Total=992 [2021-12-18 20:21:48,142 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 103 mSDsluCounter, 507 mSDsCounter, 0 mSdLazyCounter, 490 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 567 SdHoareTripleChecker+Invalid, 841 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 490 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 342 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-12-18 20:21:48,142 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [103 Valid, 567 Invalid, 841 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 490 Invalid, 0 Unknown, 342 Unchecked, 0.9s Time] [2021-12-18 20:21:48,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2021-12-18 20:21:48,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 179. [2021-12-18 20:21:48,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 130 states have (on average 1.2923076923076924) internal successors, (168), 155 states have internal predecessors, (168), 13 states have call successors, (13), 12 states have call predecessors, (13), 11 states have return successors, (15), 11 states have call predecessors, (15), 13 states have call successors, (15) [2021-12-18 20:21:48,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 196 transitions. [2021-12-18 20:21:48,146 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 196 transitions. Word has length 45 [2021-12-18 20:21:48,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:21:48,146 INFO L470 AbstractCegarLoop]: Abstraction has 179 states and 196 transitions. [2021-12-18 20:21:48,146 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 6 states have call successors, (6), 3 states have call predecessors, (6), 5 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-18 20:21:48,146 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 196 transitions. [2021-12-18 20:21:48,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-12-18 20:21:48,147 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:21:48,147 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:21:48,155 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (27)] Forceful destruction successful, exit code 0 [2021-12-18 20:21:48,362 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (26)] Ended with exit code 0 [2021-12-18 20:21:48,553 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:21:48,553 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting list_add_tailErr1REQUIRES_VIOLATION === [create_sub_listErr0REQUIRES_VIOLATION, create_sub_listErr1REQUIRES_VIOLATION, create_sub_listErr2REQUIRES_VIOLATION, create_sub_listErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-18 20:21:48,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:21:48,553 INFO L85 PathProgramCache]: Analyzing trace with hash -1563009013, now seen corresponding path program 1 times [2021-12-18 20:21:48,553 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:21:48,554 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [907790604] [2021-12-18 20:21:48,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:21:48,554 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:21:48,554 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:21:48,554 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:21:48,556 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-12-18 20:21:48,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:21:48,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 390 conjuncts, 29 conjunts are in the unsatisfiable core [2021-12-18 20:21:48,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:21:48,964 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:21:48,972 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:21:49,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:21:49,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:21:49,031 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:21:49,031 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:21:49,076 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-18 20:21:49,200 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:21:49,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:21:49,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:21:49,582 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:21:49,725 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:21:49,725 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 18 [2021-12-18 20:21:49,987 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 2 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:21:49,988 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:21:50,560 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:21:50,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [907790604] [2021-12-18 20:21:50,560 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [907790604] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:21:50,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1902815686] [2021-12-18 20:21:50,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:21:50,561 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 20:21:50,561 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 20:21:50,562 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 20:21:50,562 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2021-12-18 20:21:52,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:21:52,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 390 conjuncts, 27 conjunts are in the unsatisfiable core [2021-12-18 20:21:52,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:21:52,104 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:21:52,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:21:52,213 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:21:52,322 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-18 20:21:52,522 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:21:52,724 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:21:52,725 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:21:52,817 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-18 20:21:52,976 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:21:53,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:21:53,209 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:21:53,408 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-12-18 20:21:53,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:21:53,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1902815686] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:21:53,684 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:21:53,684 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9] total 18 [2021-12-18 20:21:53,685 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947428858] [2021-12-18 20:21:53,685 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:21:53,685 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-12-18 20:21:53,685 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:21:53,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-12-18 20:21:53,686 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=478, Unknown=0, NotChecked=0, Total=552 [2021-12-18 20:21:53,686 INFO L87 Difference]: Start difference. First operand 179 states and 196 transitions. Second operand has 19 states, 16 states have (on average 3.1875) internal successors, (51), 15 states have internal predecessors, (51), 6 states have call successors, (8), 7 states have call predecessors, (8), 4 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-18 20:21:54,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:21:54,711 INFO L93 Difference]: Finished difference Result 247 states and 277 transitions. [2021-12-18 20:21:54,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-12-18 20:21:54,716 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 16 states have (on average 3.1875) internal successors, (51), 15 states have internal predecessors, (51), 6 states have call successors, (8), 7 states have call predecessors, (8), 4 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 51 [2021-12-18 20:21:54,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:21:54,717 INFO L225 Difference]: With dead ends: 247 [2021-12-18 20:21:54,717 INFO L226 Difference]: Without dead ends: 247 [2021-12-18 20:21:54,718 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 82 SyntacticMatches, 7 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 221 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=117, Invalid=753, Unknown=0, NotChecked=0, Total=870 [2021-12-18 20:21:54,718 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 45 mSDsluCounter, 456 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 524 SdHoareTripleChecker+Invalid, 620 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 400 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-18 20:21:54,718 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 524 Invalid, 620 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 205 Invalid, 0 Unknown, 400 Unchecked, 0.5s Time] [2021-12-18 20:21:54,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2021-12-18 20:21:54,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 243. [2021-12-18 20:21:54,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 182 states have (on average 1.2637362637362637) internal successors, (230), 209 states have internal predecessors, (230), 18 states have call successors, (18), 17 states have call predecessors, (18), 18 states have return successors, (26), 16 states have call predecessors, (26), 18 states have call successors, (26) [2021-12-18 20:21:54,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 274 transitions. [2021-12-18 20:21:54,723 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 274 transitions. Word has length 51 [2021-12-18 20:21:54,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:21:54,724 INFO L470 AbstractCegarLoop]: Abstraction has 243 states and 274 transitions. [2021-12-18 20:21:54,724 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 16 states have (on average 3.1875) internal successors, (51), 15 states have internal predecessors, (51), 6 states have call successors, (8), 7 states have call predecessors, (8), 4 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-18 20:21:54,724 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 274 transitions. [2021-12-18 20:21:54,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-12-18 20:21:54,724 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:21:54,724 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:21:54,732 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (29)] Ended with exit code 0 [2021-12-18 20:21:54,941 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-12-18 20:21:55,131 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:21:55,131 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting list_add_tailErr0REQUIRES_VIOLATION === [create_sub_listErr0REQUIRES_VIOLATION, create_sub_listErr1REQUIRES_VIOLATION, create_sub_listErr2REQUIRES_VIOLATION, create_sub_listErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-18 20:21:55,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:21:55,132 INFO L85 PathProgramCache]: Analyzing trace with hash -1563009014, now seen corresponding path program 1 times [2021-12-18 20:21:55,132 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:21:55,132 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [76821288] [2021-12-18 20:21:55,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:21:55,132 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:21:55,132 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:21:55,133 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:21:55,134 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-12-18 20:21:55,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:21:55,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 390 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-18 20:21:55,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:21:55,502 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:21:55,549 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:21:55,549 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 20 treesize of output 27 [2021-12-18 20:21:55,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-12-18 20:21:55,669 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:21:55,842 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:21:55,843 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:21:55,988 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:21:56,154 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-18 20:21:56,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 21 [2021-12-18 20:21:56,292 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 2 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:21:56,292 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:21:56,566 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:21:56,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [76821288] [2021-12-18 20:21:56,566 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [76821288] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:21:56,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [372440934] [2021-12-18 20:21:56,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:21:56,566 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 20:21:56,566 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 20:21:56,567 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 20:21:56,568 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (31)] Waiting until timeout for monitored process [2021-12-18 20:21:57,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:21:57,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 390 conjuncts, 21 conjunts are in the unsatisfiable core [2021-12-18 20:21:57,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:21:57,980 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-18 20:21:57,980 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 19 [2021-12-18 20:21:58,080 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:21:58,109 INFO L354 Elim1Store]: treesize reduction 16, result has 42.9 percent of original size [2021-12-18 20:21:58,109 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 23 treesize of output 35 [2021-12-18 20:21:58,290 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-12-18 20:21:58,290 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 23 [2021-12-18 20:21:58,454 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:21:58,615 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:21:58,642 INFO L354 Elim1Store]: treesize reduction 16, result has 42.9 percent of original size [2021-12-18 20:21:58,642 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 33 treesize of output 45 [2021-12-18 20:21:58,794 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-12-18 20:21:58,795 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 23 [2021-12-18 20:21:58,959 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:21:59,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:21:59,180 INFO L354 Elim1Store]: treesize reduction 16, result has 42.9 percent of original size [2021-12-18 20:21:59,180 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 33 treesize of output 45 [2021-12-18 20:21:59,577 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-12-18 20:21:59,578 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:21:59,695 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [372440934] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:21:59,696 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:21:59,696 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9] total 19 [2021-12-18 20:21:59,696 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057141342] [2021-12-18 20:21:59,696 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:21:59,696 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-18 20:21:59,696 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:21:59,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-18 20:21:59,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=509, Unknown=0, NotChecked=0, Total=600 [2021-12-18 20:21:59,697 INFO L87 Difference]: Start difference. First operand 243 states and 274 transitions. Second operand has 20 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 states have internal predecessors, (52), 6 states have call successors, (8), 7 states have call predecessors, (8), 4 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-18 20:22:00,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:22:00,305 INFO L93 Difference]: Finished difference Result 264 states and 291 transitions. [2021-12-18 20:22:00,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-12-18 20:22:00,307 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 states have internal predecessors, (52), 6 states have call successors, (8), 7 states have call predecessors, (8), 4 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 51 [2021-12-18 20:22:00,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:22:00,308 INFO L225 Difference]: With dead ends: 264 [2021-12-18 20:22:00,308 INFO L226 Difference]: Without dead ends: 264 [2021-12-18 20:22:00,309 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 84 SyntacticMatches, 10 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=149, Invalid=781, Unknown=0, NotChecked=0, Total=930 [2021-12-18 20:22:00,309 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 58 mSDsluCounter, 631 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 700 SdHoareTripleChecker+Invalid, 545 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 350 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-18 20:22:00,309 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 700 Invalid, 545 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 174 Invalid, 0 Unknown, 350 Unchecked, 0.3s Time] [2021-12-18 20:22:00,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2021-12-18 20:22:00,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 243. [2021-12-18 20:22:00,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 182 states have (on average 1.2582417582417582) internal successors, (229), 209 states have internal predecessors, (229), 18 states have call successors, (18), 17 states have call predecessors, (18), 18 states have return successors, (26), 16 states have call predecessors, (26), 18 states have call successors, (26) [2021-12-18 20:22:00,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 273 transitions. [2021-12-18 20:22:00,314 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 273 transitions. Word has length 51 [2021-12-18 20:22:00,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:22:00,314 INFO L470 AbstractCegarLoop]: Abstraction has 243 states and 273 transitions. [2021-12-18 20:22:00,314 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 states have internal predecessors, (52), 6 states have call successors, (8), 7 states have call predecessors, (8), 4 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-18 20:22:00,315 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 273 transitions. [2021-12-18 20:22:00,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-12-18 20:22:00,315 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:22:00,315 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:22:00,329 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (30)] Ended with exit code 0 [2021-12-18 20:22:00,531 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (31)] Forceful destruction successful, exit code 0 [2021-12-18 20:22:00,725 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2021-12-18 20:22:00,725 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting list_add_tailErr1REQUIRES_VIOLATION === [create_sub_listErr0REQUIRES_VIOLATION, create_sub_listErr1REQUIRES_VIOLATION, create_sub_listErr2REQUIRES_VIOLATION, create_sub_listErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-18 20:22:00,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:22:00,726 INFO L85 PathProgramCache]: Analyzing trace with hash -189202688, now seen corresponding path program 1 times [2021-12-18 20:22:00,726 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:22:00,726 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [274972003] [2021-12-18 20:22:00,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:22:00,726 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:22:00,726 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:22:00,727 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:22:00,727 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-12-18 20:22:01,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:22:01,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 27 conjunts are in the unsatisfiable core [2021-12-18 20:22:01,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:22:01,212 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:22:01,475 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:22:01,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:22:01,486 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:22:01,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2021-12-18 20:22:01,583 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 26 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:22:01,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:22:04,350 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:22:04,350 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 14 [2021-12-18 20:22:04,539 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:22:04,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [274972003] [2021-12-18 20:22:04,540 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [274972003] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:22:04,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1556014616] [2021-12-18 20:22:04,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:22:04,540 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 20:22:04,540 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 20:22:04,541 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 20:22:04,541 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2021-12-18 20:22:05,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:22:05,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 48 conjunts are in the unsatisfiable core [2021-12-18 20:22:05,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:22:05,230 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:22:05,239 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:22:05,581 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:22:06,000 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:22:06,001 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:22:06,016 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:22:06,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:22:06,317 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:22:06,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:22:06,334 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:22:06,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:22:06,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:22:06,938 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:22:06,952 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:22:06,952 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:22:07,138 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 12 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:22:07,139 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:22:07,612 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:22:07,613 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 14 [2021-12-18 20:22:08,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1556014616] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:22:08,077 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:22:08,077 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 30 [2021-12-18 20:22:08,077 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1175785608] [2021-12-18 20:22:08,077 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:22:08,078 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-12-18 20:22:08,078 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:22:08,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-12-18 20:22:08,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1212, Unknown=1, NotChecked=0, Total=1332 [2021-12-18 20:22:08,078 INFO L87 Difference]: Start difference. First operand 243 states and 273 transitions. Second operand has 31 states, 30 states have (on average 2.8666666666666667) internal successors, (86), 25 states have internal predecessors, (86), 8 states have call successors, (10), 7 states have call predecessors, (10), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-18 20:22:12,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:22:12,105 INFO L93 Difference]: Finished difference Result 310 states and 346 transitions. [2021-12-18 20:22:12,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-12-18 20:22:12,106 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 2.8666666666666667) internal successors, (86), 25 states have internal predecessors, (86), 8 states have call successors, (10), 7 states have call predecessors, (10), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 52 [2021-12-18 20:22:12,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:22:12,107 INFO L225 Difference]: With dead ends: 310 [2021-12-18 20:22:12,107 INFO L226 Difference]: Without dead ends: 310 [2021-12-18 20:22:12,108 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 92 SyntacticMatches, 7 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 904 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=379, Invalid=3042, Unknown=1, NotChecked=0, Total=3422 [2021-12-18 20:22:12,108 INFO L933 BasicCegarLoop]: 94 mSDtfsCounter, 239 mSDsluCounter, 769 mSDsCounter, 0 mSdLazyCounter, 782 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 245 SdHoareTripleChecker+Valid, 863 SdHoareTripleChecker+Invalid, 1158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 782 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 352 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-12-18 20:22:12,108 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [245 Valid, 863 Invalid, 1158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 782 Invalid, 0 Unknown, 352 Unchecked, 1.8s Time] [2021-12-18 20:22:12,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2021-12-18 20:22:12,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 259. [2021-12-18 20:22:12,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 196 states have (on average 1.239795918367347) internal successors, (243), 223 states have internal predecessors, (243), 19 states have call successors, (19), 18 states have call predecessors, (19), 20 states have return successors, (25), 17 states have call predecessors, (25), 19 states have call successors, (25) [2021-12-18 20:22:12,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 287 transitions. [2021-12-18 20:22:12,113 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 287 transitions. Word has length 52 [2021-12-18 20:22:12,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:22:12,113 INFO L470 AbstractCegarLoop]: Abstraction has 259 states and 287 transitions. [2021-12-18 20:22:12,113 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 2.8666666666666667) internal successors, (86), 25 states have internal predecessors, (86), 8 states have call successors, (10), 7 states have call predecessors, (10), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-18 20:22:12,114 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 287 transitions. [2021-12-18 20:22:12,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-12-18 20:22:12,114 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:22:12,114 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:22:12,137 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-12-18 20:22:12,325 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (33)] Ended with exit code 0 [2021-12-18 20:22:12,514 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2021-12-18 20:22:12,515 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting list_add_tailErr8REQUIRES_VIOLATION === [create_sub_listErr0REQUIRES_VIOLATION, create_sub_listErr1REQUIRES_VIOLATION, create_sub_listErr2REQUIRES_VIOLATION, create_sub_listErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-18 20:22:12,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:22:12,515 INFO L85 PathProgramCache]: Analyzing trace with hash -1771803766, now seen corresponding path program 2 times [2021-12-18 20:22:12,515 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:22:12,515 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [176999010] [2021-12-18 20:22:12,515 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-18 20:22:12,515 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:22:12,516 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:22:12,516 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:22:12,517 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-12-18 20:22:13,205 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-18 20:22:13,205 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 20:22:13,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 60 conjunts are in the unsatisfiable core [2021-12-18 20:22:13,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:22:13,516 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:22:13,517 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 19 treesize of output 26 [2021-12-18 20:22:13,820 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 [2021-12-18 20:22:13,936 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:22:13,937 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 1 case distinctions, treesize of input 16 treesize of output 22 [2021-12-18 20:22:13,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-12-18 20:22:14,062 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:22:14,062 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 1 case distinctions, treesize of input 20 treesize of output 26 [2021-12-18 20:22:14,826 INFO L354 Elim1Store]: treesize reduction 21, result has 47.5 percent of original size [2021-12-18 20:22:14,827 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 1 case distinctions, treesize of input 25 treesize of output 34 [2021-12-18 20:22:16,559 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:22:16,598 INFO L354 Elim1Store]: treesize reduction 34, result has 38.2 percent of original size [2021-12-18 20:22:16,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 38 [2021-12-18 20:22:16,767 INFO L354 Elim1Store]: treesize reduction 20, result has 57.4 percent of original size [2021-12-18 20:22:16,767 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 2 new quantified variables, introduced 3 case distinctions, treesize of input 39 treesize of output 56 [2021-12-18 20:22:16,938 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-12-18 20:22:17,350 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 21 [2021-12-18 20:22:17,416 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-12-18 20:22:17,624 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-12-18 20:22:17,625 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 17 [2021-12-18 20:22:19,786 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:22:19,786 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 148 treesize of output 160 [2021-12-18 20:22:19,800 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:22:19,800 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-12-18 20:22:20,402 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 12 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:22:20,403 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:22:20,955 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 22 [2021-12-18 20:22:21,198 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_create_sub_list_insert_sub_~sub~0#1.base_68| (_ BitVec 32)) (v_ArrVal_2651 (_ BitVec 1)) (v_ArrVal_2653 (Array (_ BitVec 32) (_ BitVec 32)))) (or (and (not (bvule (bvadd |c_create_sub_list_~sub#1.offset| (_ bv8 32)) (_ bv12 32))) (= |c_create_sub_list_~sub#1.base| |v_create_sub_list_insert_sub_~sub~0#1.base_68|)) (= (_ bv0 1) (bvadd (select (store |c_#valid| |v_create_sub_list_insert_sub_~sub~0#1.base_68| v_ArrVal_2651) (select (select (store |c_#memory_$Pointer$.base| |v_create_sub_list_insert_sub_~sub~0#1.base_68| v_ArrVal_2653) |c_create_sub_list_~sub#1.base|) (bvadd |c_create_sub_list_~sub#1.offset| (_ bv4 32)))) (_ bv1 1))) (not (= (_ bv0 1) (bvadd (bvneg v_ArrVal_2651) (_ bv1 1)))))) is different from false [2021-12-18 20:22:21,941 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:22:21,942 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 53 treesize of output 44 [2021-12-18 20:22:22,004 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:22:22,004 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 1616 treesize of output 1606 [2021-12-18 20:22:22,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 1742 treesize of output 1678 [2021-12-18 20:22:22,098 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 1678 treesize of output 1550 Killed by 15