./Ultimate.py --spec ../sv-benchmarks/c/properties/valid-memcleanup.prp --file ../sv-benchmarks/c/verifythis/tree_max.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (memcleanup) 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/verifythis/tree_max.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-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-memcleanup) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash e98a60ea9ee0c00575c08606ce8b95d0660c5b235c5932147dfee4b13512f57c --- Real Ultimate output --- This is Ultimate 0.2.2-tmp.no-commuhash-c3fed41 [2021-12-18 19:20:28,819 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-18 19:20:28,821 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-18 19:20:28,883 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-18 19:20:28,884 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-18 19:20:28,885 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-18 19:20:28,886 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-18 19:20:28,887 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-18 19:20:28,888 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-18 19:20:28,889 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-18 19:20:28,890 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-18 19:20:28,890 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-18 19:20:28,891 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-18 19:20:28,891 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-18 19:20:28,892 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-18 19:20:28,893 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-18 19:20:28,894 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-18 19:20:28,894 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-18 19:20:28,895 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-18 19:20:28,897 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-18 19:20:28,898 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-18 19:20:28,899 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-18 19:20:28,899 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-18 19:20:28,900 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-18 19:20:28,902 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-18 19:20:28,902 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-18 19:20:28,903 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-18 19:20:28,903 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-18 19:20:28,904 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-18 19:20:28,904 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-18 19:20:28,905 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-18 19:20:28,905 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-18 19:20:28,906 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-18 19:20:28,906 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-18 19:20:28,907 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-18 19:20:28,908 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-18 19:20:28,908 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-18 19:20:28,908 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-18 19:20:28,909 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-18 19:20:28,909 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-18 19:20:28,910 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-18 19:20:28,911 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-32bit-Automizer_Default.epf [2021-12-18 19:20:28,925 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-18 19:20:28,925 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-18 19:20:28,926 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-18 19:20:28,926 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-18 19:20:28,926 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-18 19:20:28,926 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-18 19:20:28,927 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-18 19:20:28,927 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-18 19:20:28,927 INFO L138 SettingsManager]: * Use SBE=true [2021-12-18 19:20:28,928 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-18 19:20:28,928 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-18 19:20:28,928 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-18 19:20:28,928 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-18 19:20:28,928 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-18 19:20:28,929 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-18 19:20:28,929 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-18 19:20:28,929 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-18 19:20:28,929 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-18 19:20:28,929 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-18 19:20:28,930 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-18 19:20:28,930 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-18 19:20:28,930 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-18 19:20:28,930 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-18 19:20:28,930 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-18 19:20:28,931 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-18 19:20:28,931 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-18 19:20:28,931 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-18 19:20:28,931 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-18 19:20:28,931 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-18 19:20:28,932 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-18 19:20:28,932 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e98a60ea9ee0c00575c08606ce8b95d0660c5b235c5932147dfee4b13512f57c [2021-12-18 19:20:29,177 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-18 19:20:29,245 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-18 19:20:29,247 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-18 19:20:29,247 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-18 19:20:29,271 INFO L275 PluginConnector]: CDTParser initialized [2021-12-18 19:20:29,273 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/verifythis/tree_max.c [2021-12-18 19:20:29,329 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e819aed40/722853c464374af1970611afe54be70d/FLAG15f880ee1 [2021-12-18 19:20:29,817 INFO L306 CDTParser]: Found 1 translation units. [2021-12-18 19:20:29,818 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_max.c [2021-12-18 19:20:29,831 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e819aed40/722853c464374af1970611afe54be70d/FLAG15f880ee1 [2021-12-18 19:20:30,327 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e819aed40/722853c464374af1970611afe54be70d [2021-12-18 19:20:30,330 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-18 19:20:30,331 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-18 19:20:30,341 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-18 19:20:30,341 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-18 19:20:30,344 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-18 19:20:30,344 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.12 07:20:30" (1/1) ... [2021-12-18 19:20:30,345 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2531a5fe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 07:20:30, skipping insertion in model container [2021-12-18 19:20:30,345 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.12 07:20:30" (1/1) ... [2021-12-18 19:20:30,349 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-18 19:20:30,358 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-18 19:20:30,532 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_max.c[544,557] [2021-12-18 19:20:30,558 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-18 19:20:30,581 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 19:20:30,582 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@10e56d61 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 07:20:30, skipping insertion in model container [2021-12-18 19:20:30,582 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-18 19:20:30,582 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-12-18 19:20:30,585 INFO L158 Benchmark]: Toolchain (without parser) took 252.20ms. Allocated memory is still 104.9MB. Free memory was 76.4MB in the beginning and 81.4MB in the end (delta: -5.0MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-12-18 19:20:30,586 INFO L158 Benchmark]: CDTParser took 0.27ms. Allocated memory is still 104.9MB. Free memory is still 62.1MB. There was no memory consumed. Max. memory is 16.1GB. [2021-12-18 19:20:30,587 INFO L158 Benchmark]: CACSL2BoogieTranslator took 240.93ms. Allocated memory is still 104.9MB. Free memory was 76.4MB in the beginning and 81.4MB in the end (delta: -5.0MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-12-18 19:20:30,590 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27ms. Allocated memory is still 104.9MB. Free memory is still 62.1MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 240.93ms. Allocated memory is still 104.9MB. Free memory was 76.4MB in the beginning and 81.4MB in the end (delta: -5.0MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 27]: 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/verifythis/tree_max.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-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-memcleanup) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash e98a60ea9ee0c00575c08606ce8b95d0660c5b235c5932147dfee4b13512f57c --- Real Ultimate output --- This is Ultimate 0.2.2-tmp.no-commuhash-c3fed41 [2021-12-18 19:20:32,887 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-18 19:20:32,889 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-18 19:20:32,919 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-18 19:20:32,920 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-18 19:20:32,922 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-18 19:20:32,923 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-18 19:20:32,926 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-18 19:20:32,928 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-18 19:20:32,931 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-18 19:20:32,939 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-18 19:20:32,940 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-18 19:20:32,940 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-18 19:20:32,941 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-18 19:20:32,942 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-18 19:20:32,942 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-18 19:20:32,943 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-18 19:20:32,944 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-18 19:20:32,945 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-18 19:20:32,946 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-18 19:20:32,947 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-18 19:20:32,948 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-18 19:20:32,948 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-18 19:20:32,949 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-18 19:20:32,950 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-18 19:20:32,951 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-18 19:20:32,951 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-18 19:20:32,951 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-18 19:20:32,952 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-18 19:20:32,952 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-18 19:20:32,953 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-18 19:20:32,953 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-18 19:20:32,954 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-18 19:20:32,954 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-18 19:20:32,955 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-18 19:20:32,955 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-18 19:20:32,956 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-18 19:20:32,956 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-18 19:20:32,956 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-18 19:20:32,957 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-18 19:20:32,957 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-18 19:20:32,958 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-32bit-Automizer_Bitvector.epf [2021-12-18 19:20:32,972 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-18 19:20:32,972 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-18 19:20:32,972 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-18 19:20:32,973 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-18 19:20:32,973 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-18 19:20:32,973 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-18 19:20:32,974 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-18 19:20:32,974 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-18 19:20:32,974 INFO L138 SettingsManager]: * Use SBE=true [2021-12-18 19:20:32,974 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-18 19:20:32,975 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-18 19:20:32,975 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-18 19:20:32,975 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-18 19:20:32,975 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-18 19:20:32,975 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-18 19:20:32,975 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-18 19:20:32,976 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-18 19:20:32,976 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-18 19:20:32,976 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-18 19:20:32,976 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-12-18 19:20:32,976 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-12-18 19:20:32,976 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-18 19:20:32,977 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-18 19:20:32,977 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-18 19:20:32,977 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-18 19:20:32,977 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-18 19:20:32,977 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-18 19:20:32,978 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-18 19:20:32,978 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-18 19:20:32,978 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2021-12-18 19:20:32,978 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-12-18 19:20:32,978 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-18 19:20:32,978 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-12-18 19:20:32,979 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e98a60ea9ee0c00575c08606ce8b95d0660c5b235c5932147dfee4b13512f57c [2021-12-18 19:20:33,315 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-18 19:20:33,350 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-18 19:20:33,352 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-18 19:20:33,352 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-18 19:20:33,354 INFO L275 PluginConnector]: CDTParser initialized [2021-12-18 19:20:33,355 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/verifythis/tree_max.c [2021-12-18 19:20:33,437 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/068c9a7b6/1398e2b6cdaa4c58b47778857028b4c4/FLAG2ae1d0387 [2021-12-18 19:20:33,881 INFO L306 CDTParser]: Found 1 translation units. [2021-12-18 19:20:33,882 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_max.c [2021-12-18 19:20:33,886 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/068c9a7b6/1398e2b6cdaa4c58b47778857028b4c4/FLAG2ae1d0387 [2021-12-18 19:20:34,279 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/068c9a7b6/1398e2b6cdaa4c58b47778857028b4c4 [2021-12-18 19:20:34,286 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-18 19:20:34,287 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-18 19:20:34,292 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-18 19:20:34,292 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-18 19:20:34,297 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-18 19:20:34,298 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.12 07:20:34" (1/1) ... [2021-12-18 19:20:34,299 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@39944819 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 07:20:34, skipping insertion in model container [2021-12-18 19:20:34,308 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.12 07:20:34" (1/1) ... [2021-12-18 19:20:34,314 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-18 19:20:34,339 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-18 19:20:34,545 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_max.c[544,557] [2021-12-18 19:20:34,580 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-18 19:20:34,603 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-12-18 19:20:34,609 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-18 19:20:34,619 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_max.c[544,557] [2021-12-18 19:20:34,632 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-18 19:20:34,641 INFO L203 MainTranslator]: Completed pre-run [2021-12-18 19:20:34,700 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_max.c[544,557] [2021-12-18 19:20:34,713 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-18 19:20:34,737 INFO L208 MainTranslator]: Completed translation [2021-12-18 19:20:34,737 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 07:20:34 WrapperNode [2021-12-18 19:20:34,737 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-18 19:20:34,739 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-18 19:20:34,739 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-18 19:20:34,739 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-18 19:20:34,744 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 07:20:34" (1/1) ... [2021-12-18 19:20:34,778 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 07:20:34" (1/1) ... [2021-12-18 19:20:34,801 INFO L137 Inliner]: procedures = 26, calls = 28, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 37 [2021-12-18 19:20:34,802 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-18 19:20:34,802 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-18 19:20:34,803 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-18 19:20:34,803 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-18 19:20:34,808 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 07:20:34" (1/1) ... [2021-12-18 19:20:34,809 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 07:20:34" (1/1) ... [2021-12-18 19:20:34,814 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 07:20:34" (1/1) ... [2021-12-18 19:20:34,814 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 07:20:34" (1/1) ... [2021-12-18 19:20:34,821 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 07:20:34" (1/1) ... [2021-12-18 19:20:34,823 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 07:20:34" (1/1) ... [2021-12-18 19:20:34,824 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 07:20:34" (1/1) ... [2021-12-18 19:20:34,825 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-18 19:20:34,826 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-18 19:20:34,826 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-18 19:20:34,826 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-18 19:20:34,827 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 07:20:34" (1/1) ... [2021-12-18 19:20:34,833 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-18 19:20:34,842 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 19:20:34,876 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 19:20:34,896 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 19:20:34,920 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-18 19:20:34,920 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-12-18 19:20:34,920 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-12-18 19:20:34,920 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-12-18 19:20:34,920 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-12-18 19:20:34,920 INFO L130 BoogieDeclarations]: Found specification of procedure max [2021-12-18 19:20:34,921 INFO L138 BoogieDeclarations]: Found implementation of procedure max [2021-12-18 19:20:34,921 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2021-12-18 19:20:34,921 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2021-12-18 19:20:34,921 INFO L130 BoogieDeclarations]: Found specification of procedure check [2021-12-18 19:20:34,921 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2021-12-18 19:20:34,921 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-18 19:20:34,921 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-18 19:20:34,921 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-18 19:20:34,922 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-12-18 19:20:35,031 INFO L236 CfgBuilder]: Building ICFG [2021-12-18 19:20:35,033 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-18 19:20:35,354 INFO L277 CfgBuilder]: Performing block encoding [2021-12-18 19:20:35,363 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-18 19:20:35,364 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-12-18 19:20:35,365 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.12 07:20:35 BoogieIcfgContainer [2021-12-18 19:20:35,366 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-18 19:20:35,367 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-18 19:20:35,368 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-18 19:20:35,370 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-18 19:20:35,370 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.12 07:20:34" (1/3) ... [2021-12-18 19:20:35,371 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@693d4ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.12 07:20:35, skipping insertion in model container [2021-12-18 19:20:35,371 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 07:20:34" (2/3) ... [2021-12-18 19:20:35,371 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@693d4ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.12 07:20:35, skipping insertion in model container [2021-12-18 19:20:35,371 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.12 07:20:35" (3/3) ... [2021-12-18 19:20:35,372 INFO L111 eAbstractionObserver]: Analyzing ICFG tree_max.c [2021-12-18 19:20:35,377 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-18 19:20:35,377 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 20 error locations. [2021-12-18 19:20:35,413 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-18 19:20:35,419 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 19:20:35,419 INFO L340 AbstractCegarLoop]: Starting to check reachability of 20 error locations. [2021-12-18 19:20:35,441 INFO L276 IsEmpty]: Start isEmpty. Operand has 72 states, 39 states have (on average 1.6923076923076923) internal successors, (66), 59 states have internal predecessors, (66), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-18 19:20:35,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-12-18 19:20:35,447 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:20:35,447 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-12-18 19:20:35,448 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting nondet_treeErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:20:35,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:20:35,451 INFO L85 PathProgramCache]: Analyzing trace with hash 73597257, now seen corresponding path program 1 times [2021-12-18 19:20:35,459 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:20:35,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1543514581] [2021-12-18 19:20:35,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 19:20:35,461 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:20:35,461 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:20:35,477 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 19:20:35,481 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 19:20:35,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 19:20:35,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-18 19:20:35,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:20:35,629 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 19:20:35,639 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 19:20:35,639 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 19:20:35,647 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:20:35,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1543514581] [2021-12-18 19:20:35,649 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1543514581] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 19:20:35,649 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 19:20:35,649 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-18 19:20:35,650 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [368590940] [2021-12-18 19:20:35,651 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 19:20:35,653 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-18 19:20:35,653 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:20:35,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-18 19:20:35,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 19:20:35,692 INFO L87 Difference]: Start difference. First operand has 72 states, 39 states have (on average 1.6923076923076923) internal successors, (66), 59 states have internal predecessors, (66), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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 19:20:35,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:20:35,791 INFO L93 Difference]: Finished difference Result 73 states and 86 transitions. [2021-12-18 19:20:35,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-18 19:20:35,793 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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 5 [2021-12-18 19:20:35,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:20:35,800 INFO L225 Difference]: With dead ends: 73 [2021-12-18 19:20:35,800 INFO L226 Difference]: Without dead ends: 71 [2021-12-18 19:20:35,802 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 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 19:20:35,813 INFO L933 BasicCegarLoop]: 83 mSDtfsCounter, 6 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 19:20:35,815 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 133 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-18 19:20:35,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-12-18 19:20:35,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 69. [2021-12-18 19:20:35,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 38 states have (on average 1.631578947368421) internal successors, (62), 56 states have internal predecessors, (62), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-18 19:20:35,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 80 transitions. [2021-12-18 19:20:35,900 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 80 transitions. Word has length 5 [2021-12-18 19:20:35,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:20:35,900 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 80 transitions. [2021-12-18 19:20:35,900 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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 19:20:35,900 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 80 transitions. [2021-12-18 19:20:35,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-12-18 19:20:35,901 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:20:35,901 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-12-18 19:20:35,910 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 19:20:36,101 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 19:20:36,102 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting nondet_treeErr1REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:20:36,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:20:36,103 INFO L85 PathProgramCache]: Analyzing trace with hash 73597258, now seen corresponding path program 1 times [2021-12-18 19:20:36,103 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:20:36,103 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1358309620] [2021-12-18 19:20:36,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 19:20:36,103 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:20:36,104 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:20:36,112 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 19:20:36,124 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 19:20:36,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 19:20:36,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-18 19:20:36,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:20:36,214 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 19:20:36,221 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 19:20:36,222 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 19:20:36,222 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:20:36,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1358309620] [2021-12-18 19:20:36,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1358309620] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 19:20:36,222 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 19:20:36,222 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-18 19:20:36,223 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596372592] [2021-12-18 19:20:36,223 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 19:20:36,224 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-18 19:20:36,224 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:20:36,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-18 19:20:36,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 19:20:36,225 INFO L87 Difference]: Start difference. First operand 69 states and 80 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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 19:20:36,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:20:36,315 INFO L93 Difference]: Finished difference Result 68 states and 79 transitions. [2021-12-18 19:20:36,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-18 19:20:36,316 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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 5 [2021-12-18 19:20:36,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:20:36,317 INFO L225 Difference]: With dead ends: 68 [2021-12-18 19:20:36,317 INFO L226 Difference]: Without dead ends: 68 [2021-12-18 19:20:36,318 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 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 19:20:36,318 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 2 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 19:20:36,319 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 132 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-18 19:20:36,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-12-18 19:20:36,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-12-18 19:20:36,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 38 states have (on average 1.605263157894737) internal successors, (61), 55 states have internal predecessors, (61), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-18 19:20:36,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 79 transitions. [2021-12-18 19:20:36,328 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 79 transitions. Word has length 5 [2021-12-18 19:20:36,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:20:36,328 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 79 transitions. [2021-12-18 19:20:36,328 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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 19:20:36,328 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 79 transitions. [2021-12-18 19:20:36,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-18 19:20:36,329 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:20:36,330 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 19:20:36,345 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 19:20:36,536 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 19:20:36,537 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting maxErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:20:36,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:20:36,537 INFO L85 PathProgramCache]: Analyzing trace with hash -345289291, now seen corresponding path program 1 times [2021-12-18 19:20:36,538 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:20:36,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [132736550] [2021-12-18 19:20:36,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 19:20:36,538 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:20:36,538 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:20:36,546 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 19:20:36,563 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 19:20:36,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 19:20:36,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-18 19:20:36,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:20:36,768 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 19:20:36,768 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 19:20:36,768 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:20:36,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [132736550] [2021-12-18 19:20:36,769 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [132736550] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 19:20:36,769 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 19:20:36,769 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-18 19:20:36,769 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492090252] [2021-12-18 19:20:36,769 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 19:20:36,770 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-18 19:20:36,770 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:20:36,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-18 19:20:36,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-18 19:20:36,771 INFO L87 Difference]: Start difference. First operand 68 states and 79 transitions. Second operand has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-18 19:20:36,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:20:36,866 INFO L93 Difference]: Finished difference Result 83 states and 98 transitions. [2021-12-18 19:20:36,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-18 19:20:36,869 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-12-18 19:20:36,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:20:36,870 INFO L225 Difference]: With dead ends: 83 [2021-12-18 19:20:36,870 INFO L226 Difference]: Without dead ends: 83 [2021-12-18 19:20:36,870 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-12-18 19:20:36,871 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 11 mSDsluCounter, 367 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 444 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 19:20:36,871 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 444 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-18 19:20:36,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-12-18 19:20:36,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 76. [2021-12-18 19:20:36,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 43 states have (on average 1.5348837209302326) internal successors, (66), 61 states have internal predecessors, (66), 10 states have call successors, (10), 4 states have call predecessors, (10), 5 states have return successors, (13), 10 states have call predecessors, (13), 10 states have call successors, (13) [2021-12-18 19:20:36,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 89 transitions. [2021-12-18 19:20:36,878 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 89 transitions. Word has length 11 [2021-12-18 19:20:36,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:20:36,878 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 89 transitions. [2021-12-18 19:20:36,878 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-18 19:20:36,879 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 89 transitions. [2021-12-18 19:20:36,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-18 19:20:36,881 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:20:36,881 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 19:20:36,893 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-12-18 19:20:37,088 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 19:20:37,088 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:20:37,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:20:37,089 INFO L85 PathProgramCache]: Analyzing trace with hash -159104294, now seen corresponding path program 1 times [2021-12-18 19:20:37,091 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:20:37,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1761362269] [2021-12-18 19:20:37,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 19:20:37,092 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:20:37,092 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:20:37,098 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 19:20:37,106 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 19:20:37,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 19:20:37,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-18 19:20:37,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:20:37,187 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 19:20:37,224 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 19:20:37,225 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 19:20:37,226 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:20:37,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1761362269] [2021-12-18 19:20:37,230 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1761362269] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 19:20:37,230 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 19:20:37,230 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-18 19:20:37,230 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808830604] [2021-12-18 19:20:37,231 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 19:20:37,231 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-18 19:20:37,231 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:20:37,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-18 19:20:37,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-18 19:20:37,232 INFO L87 Difference]: Start difference. First operand 76 states and 89 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-18 19:20:37,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:20:37,483 INFO L93 Difference]: Finished difference Result 80 states and 93 transitions. [2021-12-18 19:20:37,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-18 19:20:37,483 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-12-18 19:20:37,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:20:37,484 INFO L225 Difference]: With dead ends: 80 [2021-12-18 19:20:37,484 INFO L226 Difference]: Without dead ends: 80 [2021-12-18 19:20:37,484 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-18 19:20:37,485 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 49 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 19:20:37,485 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 72 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-18 19:20:37,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-12-18 19:20:37,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 78. [2021-12-18 19:20:37,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 45 states have (on average 1.5555555555555556) internal successors, (70), 61 states have internal predecessors, (70), 10 states have call successors, (10), 4 states have call predecessors, (10), 5 states have return successors, (13), 12 states have call predecessors, (13), 10 states have call successors, (13) [2021-12-18 19:20:37,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 93 transitions. [2021-12-18 19:20:37,496 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 93 transitions. Word has length 11 [2021-12-18 19:20:37,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:20:37,497 INFO L470 AbstractCegarLoop]: Abstraction has 78 states and 93 transitions. [2021-12-18 19:20:37,497 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-18 19:20:37,498 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 93 transitions. [2021-12-18 19:20:37,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-18 19:20:37,499 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:20:37,499 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 19:20:37,520 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 19:20:37,706 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 19:20:37,707 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting nondet_treeErr3REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:20:37,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:20:37,707 INFO L85 PathProgramCache]: Analyzing trace with hash -159104293, now seen corresponding path program 1 times [2021-12-18 19:20:37,708 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:20:37,708 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1952484443] [2021-12-18 19:20:37,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 19:20:37,719 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:20:37,719 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:20:37,720 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 19:20:37,723 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 19:20:37,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 19:20:37,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-18 19:20:37,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:20:37,817 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 19:20:37,863 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 19:20:37,863 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 19:20:37,864 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:20:37,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1952484443] [2021-12-18 19:20:37,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1952484443] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 19:20:37,864 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 19:20:37,864 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-18 19:20:37,864 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549744920] [2021-12-18 19:20:37,864 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 19:20:37,865 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-18 19:20:37,865 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:20:37,865 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-18 19:20:37,865 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-18 19:20:37,865 INFO L87 Difference]: Start difference. First operand 78 states and 93 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-18 19:20:38,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:20:38,084 INFO L93 Difference]: Finished difference Result 84 states and 103 transitions. [2021-12-18 19:20:38,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-18 19:20:38,084 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-12-18 19:20:38,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:20:38,085 INFO L225 Difference]: With dead ends: 84 [2021-12-18 19:20:38,086 INFO L226 Difference]: Without dead ends: 84 [2021-12-18 19:20:38,086 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-18 19:20:38,086 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 47 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 19:20:38,087 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 83 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-18 19:20:38,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-12-18 19:20:38,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 81. [2021-12-18 19:20:38,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 47 states have (on average 1.5106382978723405) internal successors, (71), 63 states have internal predecessors, (71), 11 states have call successors, (11), 4 states have call predecessors, (11), 5 states have return successors, (15), 13 states have call predecessors, (15), 11 states have call successors, (15) [2021-12-18 19:20:38,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 97 transitions. [2021-12-18 19:20:38,093 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 97 transitions. Word has length 11 [2021-12-18 19:20:38,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:20:38,093 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 97 transitions. [2021-12-18 19:20:38,094 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-18 19:20:38,094 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 97 transitions. [2021-12-18 19:20:38,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-12-18 19:20:38,094 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:20:38,094 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 19:20:38,105 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 19:20:38,301 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 19:20:38,302 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting checkErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:20:38,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:20:38,303 INFO L85 PathProgramCache]: Analyzing trace with hash -1041946460, now seen corresponding path program 1 times [2021-12-18 19:20:38,303 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:20:38,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [706247788] [2021-12-18 19:20:38,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 19:20:38,303 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:20:38,303 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:20:38,304 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 19:20:38,305 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 19:20:38,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 19:20:38,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-18 19:20:38,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:20:38,464 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 19:20:38,464 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 19:20:38,465 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:20:38,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [706247788] [2021-12-18 19:20:38,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [706247788] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 19:20:38,466 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 19:20:38,466 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-18 19:20:38,466 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721529915] [2021-12-18 19:20:38,466 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 19:20:38,466 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-18 19:20:38,467 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:20:38,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-18 19:20:38,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-18 19:20:38,467 INFO L87 Difference]: Start difference. First operand 81 states and 97 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 19:20:38,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:20:38,543 INFO L93 Difference]: Finished difference Result 92 states and 109 transitions. [2021-12-18 19:20:38,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-18 19:20:38,544 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2021-12-18 19:20:38,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:20:38,545 INFO L225 Difference]: With dead ends: 92 [2021-12-18 19:20:38,545 INFO L226 Difference]: Without dead ends: 92 [2021-12-18 19:20:38,545 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-12-18 19:20:38,545 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 10 mSDsluCounter, 367 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 444 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-18 19:20:38,546 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 444 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-18 19:20:38,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-12-18 19:20:38,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 87. [2021-12-18 19:20:38,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 51 states have (on average 1.4705882352941178) internal successors, (75), 67 states have internal predecessors, (75), 12 states have call successors, (12), 5 states have call predecessors, (12), 6 states have return successors, (16), 14 states have call predecessors, (16), 12 states have call successors, (16) [2021-12-18 19:20:38,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 103 transitions. [2021-12-18 19:20:38,556 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 103 transitions. Word has length 17 [2021-12-18 19:20:38,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:20:38,556 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 103 transitions. [2021-12-18 19:20:38,556 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 19:20:38,556 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 103 transitions. [2021-12-18 19:20:38,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-12-18 19:20:38,557 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:20:38,557 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 19:20:38,565 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-12-18 19:20:38,765 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 19:20:38,765 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONMEMORY_LEAK === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:20:38,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:20:38,766 INFO L85 PathProgramCache]: Analyzing trace with hash -868680531, now seen corresponding path program 1 times [2021-12-18 19:20:38,766 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:20:38,766 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1418131486] [2021-12-18 19:20:38,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 19:20:38,766 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:20:38,766 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:20:38,768 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 19:20:38,769 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 19:20:38,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 19:20:38,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-18 19:20:38,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:20:38,883 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 19:20:38,883 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 19:20:38,884 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:20:38,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1418131486] [2021-12-18 19:20:38,884 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1418131486] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 19:20:38,884 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 19:20:38,885 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-18 19:20:38,885 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158646124] [2021-12-18 19:20:38,885 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 19:20:38,885 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-18 19:20:38,886 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:20:38,886 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-18 19:20:38,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-18 19:20:38,886 INFO L87 Difference]: Start difference. First operand 87 states and 103 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, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-18 19:20:39,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:20:39,053 INFO L93 Difference]: Finished difference Result 89 states and 104 transitions. [2021-12-18 19:20:39,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-18 19:20:39,056 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, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 20 [2021-12-18 19:20:39,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:20:39,057 INFO L225 Difference]: With dead ends: 89 [2021-12-18 19:20:39,057 INFO L226 Difference]: Without dead ends: 75 [2021-12-18 19:20:39,057 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-18 19:20:39,058 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 42 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 19:20:39,058 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 82 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-18 19:20:39,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-12-18 19:20:39,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-12-18 19:20:39,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 43 states have (on average 1.558139534883721) internal successors, (67), 59 states have internal predecessors, (67), 10 states have call successors, (10), 3 states have call predecessors, (10), 4 states have return successors, (13), 12 states have call predecessors, (13), 10 states have call successors, (13) [2021-12-18 19:20:39,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-12-18 19:20:39,067 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 20 [2021-12-18 19:20:39,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:20:39,067 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-12-18 19:20:39,067 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, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-18 19:20:39,067 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-12-18 19:20:39,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-18 19:20:39,069 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:20:39,069 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 19:20:39,081 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-12-18 19:20:39,277 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 19:20:39,277 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:20:39,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:20:39,278 INFO L85 PathProgramCache]: Analyzing trace with hash -360622958, now seen corresponding path program 1 times [2021-12-18 19:20:39,278 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:20:39,278 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1593788235] [2021-12-18 19:20:39,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 19:20:39,278 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:20:39,279 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:20:39,296 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 19:20:39,344 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 19:20:39,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 19:20:39,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-18 19:20:39,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:20:39,470 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 19:20:39,746 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 19:20:39,746 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 19:20:39,767 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-18 19:20:39,768 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:20:39,901 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:20:39,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1593788235] [2021-12-18 19:20:39,901 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1593788235] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:20:39,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [583183203] [2021-12-18 19:20:39,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 19:20:39,901 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 19:20:39,902 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 19:20:39,911 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 19:20:39,929 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-12-18 19:20:40,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 19:20:40,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-18 19:20:40,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:20:40,078 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 19:20:42,333 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-18 19:20:42,337 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 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 19:20:42,344 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-18 19:20:42,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:20:42,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [583183203] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:20:42,479 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:20:42,479 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-12-18 19:20:42,479 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249430010] [2021-12-18 19:20:42,479 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:20:42,480 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-18 19:20:42,480 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:20:42,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-18 19:20:42,480 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=27, Unknown=1, NotChecked=0, Total=42 [2021-12-18 19:20:42,481 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 6 states, 5 states have (on average 5.4) internal successors, (27), 6 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-18 19:20:46,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:20:46,739 INFO L93 Difference]: Finished difference Result 84 states and 105 transitions. [2021-12-18 19:20:46,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-18 19:20:46,741 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.4) internal successors, (27), 6 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 29 [2021-12-18 19:20:46,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:20:46,741 INFO L225 Difference]: With dead ends: 84 [2021-12-18 19:20:46,741 INFO L226 Difference]: Without dead ends: 84 [2021-12-18 19:20:46,741 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 56 SyntacticMatches, 9 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=26, Invalid=44, Unknown=2, NotChecked=0, Total=72 [2021-12-18 19:20:46,742 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 46 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 157 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 19:20:46,742 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 102 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 96 Invalid, 0 Unknown, 157 Unchecked, 0.2s Time] [2021-12-18 19:20:46,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-12-18 19:20:46,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 79. [2021-12-18 19:20:46,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 46 states have (on average 1.5434782608695652) internal successors, (71), 62 states have internal predecessors, (71), 10 states have call successors, (10), 3 states have call predecessors, (10), 5 states have return successors, (17), 13 states have call predecessors, (17), 10 states have call successors, (17) [2021-12-18 19:20:46,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 98 transitions. [2021-12-18 19:20:46,746 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 98 transitions. Word has length 29 [2021-12-18 19:20:46,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:20:46,747 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 98 transitions. [2021-12-18 19:20:46,747 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.4) internal successors, (27), 6 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-18 19:20:46,747 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 98 transitions. [2021-12-18 19:20:46,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-18 19:20:46,751 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:20:46,752 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 19:20:46,767 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 19:20:46,966 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2021-12-18 19:20:47,162 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2021-12-18 19:20:47,162 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting nondet_treeErr3REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:20:47,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:20:47,163 INFO L85 PathProgramCache]: Analyzing trace with hash -360622957, now seen corresponding path program 1 times [2021-12-18 19:20:47,163 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:20:47,163 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1187301473] [2021-12-18 19:20:47,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 19:20:47,163 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:20:47,163 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:20:47,165 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 19:20:47,216 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 19:20:47,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 19:20:47,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-18 19:20:47,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:20:47,416 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 19:20:47,433 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 19:20:51,795 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:20:51,796 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 19:20:51,808 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 19:20:51,809 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 19:20:51,847 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-18 19:20:51,848 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:20:54,238 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:20:54,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1187301473] [2021-12-18 19:20:54,238 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1187301473] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:20:54,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [661329127] [2021-12-18 19:20:54,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 19:20:54,238 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 19:20:54,238 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 19:20:54,239 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 19:20:54,241 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2021-12-18 19:20:54,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 19:20:54,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-18 19:20:54,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:20:54,461 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 19:20:54,466 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 19:20:58,714 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:20:58,716 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 19:20:58,738 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 19:20:58,738 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 19:20:58,754 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-18 19:20:58,754 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:20:58,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [661329127] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:20:58,931 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:20:58,931 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-12-18 19:20:58,931 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099681094] [2021-12-18 19:20:58,931 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:20:58,931 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-18 19:20:58,932 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:20:58,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-18 19:20:58,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=51, Unknown=1, NotChecked=0, Total=72 [2021-12-18 19:20:58,932 INFO L87 Difference]: Start difference. First operand 79 states and 98 transitions. Second operand has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-18 19:20:59,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:20:59,200 INFO L93 Difference]: Finished difference Result 98 states and 130 transitions. [2021-12-18 19:20:59,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-18 19:20:59,201 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-12-18 19:20:59,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:20:59,202 INFO L225 Difference]: With dead ends: 98 [2021-12-18 19:20:59,202 INFO L226 Difference]: Without dead ends: 98 [2021-12-18 19:20:59,202 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 48 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=27, Invalid=62, Unknown=1, NotChecked=0, Total=90 [2021-12-18 19:20:59,202 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 99 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 92 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 19:20:59,202 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [103 Valid, 101 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 111 Invalid, 0 Unknown, 92 Unchecked, 0.2s Time] [2021-12-18 19:20:59,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-12-18 19:20:59,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 95. [2021-12-18 19:20:59,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 57 states have (on average 1.4385964912280702) internal successors, (82), 74 states have internal predecessors, (82), 13 states have call successors, (13), 4 states have call predecessors, (13), 7 states have return successors, (26), 16 states have call predecessors, (26), 13 states have call successors, (26) [2021-12-18 19:20:59,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 121 transitions. [2021-12-18 19:20:59,227 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 121 transitions. Word has length 29 [2021-12-18 19:20:59,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:20:59,227 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 121 transitions. [2021-12-18 19:20:59,227 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-18 19:20:59,227 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 121 transitions. [2021-12-18 19:20:59,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-12-18 19:20:59,228 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:20:59,229 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 19:20:59,248 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 19:20:59,492 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (12)] Forceful destruction successful, exit code 0 [2021-12-18 19:20:59,655 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2021-12-18 19:20:59,656 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting maxErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:20:59,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:20:59,656 INFO L85 PathProgramCache]: Analyzing trace with hash -694882647, now seen corresponding path program 1 times [2021-12-18 19:20:59,657 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:20:59,657 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2071929136] [2021-12-18 19:20:59,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 19:20:59,657 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:20:59,657 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:20:59,661 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 19:20:59,662 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 19:20:59,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 19:20:59,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-18 19:20:59,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:20:59,765 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 19:20:59,955 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-18 19:20:59,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:21:00,295 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-18 19:21:00,295 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:21:00,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2071929136] [2021-12-18 19:21:00,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2071929136] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 19:21:00,296 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:21:00,296 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2021-12-18 19:21:00,296 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952385052] [2021-12-18 19:21:00,296 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:21:00,296 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-18 19:21:00,296 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:21:00,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-18 19:21:00,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-12-18 19:21:00,297 INFO L87 Difference]: Start difference. First operand 95 states and 121 transitions. Second operand has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-18 19:21:00,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:21:00,718 INFO L93 Difference]: Finished difference Result 116 states and 148 transitions. [2021-12-18 19:21:00,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-18 19:21:00,718 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 25 [2021-12-18 19:21:00,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:21:00,720 INFO L225 Difference]: With dead ends: 116 [2021-12-18 19:21:00,720 INFO L226 Difference]: Without dead ends: 114 [2021-12-18 19:21:00,720 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 38 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2021-12-18 19:21:00,721 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 52 mSDsluCounter, 236 mSDsCounter, 0 mSdLazyCounter, 288 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 304 SdHoareTripleChecker+Invalid, 393 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 288 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 90 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-18 19:21:00,721 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 304 Invalid, 393 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 288 Invalid, 0 Unknown, 90 Unchecked, 0.4s Time] [2021-12-18 19:21:00,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-12-18 19:21:00,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 108. [2021-12-18 19:21:00,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 69 states have (on average 1.4202898550724639) internal successors, (98), 83 states have internal predecessors, (98), 15 states have call successors, (15), 6 states have call predecessors, (15), 8 states have return successors, (28), 18 states have call predecessors, (28), 15 states have call successors, (28) [2021-12-18 19:21:00,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 141 transitions. [2021-12-18 19:21:00,739 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 141 transitions. Word has length 25 [2021-12-18 19:21:00,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:21:00,739 INFO L470 AbstractCegarLoop]: Abstraction has 108 states and 141 transitions. [2021-12-18 19:21:00,739 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-18 19:21:00,739 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 141 transitions. [2021-12-18 19:21:00,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-12-18 19:21:00,740 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:21:00,740 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 19:21:00,752 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Ended with exit code 0 [2021-12-18 19:21:00,949 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 19:21:00,950 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting maxErr1REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:21:00,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:21:00,951 INFO L85 PathProgramCache]: Analyzing trace with hash -694882646, now seen corresponding path program 1 times [2021-12-18 19:21:00,951 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:21:00,951 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2047330127] [2021-12-18 19:21:00,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 19:21:00,951 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:21:00,952 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:21:00,953 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 19:21:00,964 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 19:21:01,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 19:21:01,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-18 19:21:01,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:21:01,081 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 19:21:01,323 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-18 19:21:01,323 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:21:02,488 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-18 19:21:02,489 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:21:02,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2047330127] [2021-12-18 19:21:02,489 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2047330127] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 19:21:02,489 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:21:02,489 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2021-12-18 19:21:02,489 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922914331] [2021-12-18 19:21:02,489 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:21:02,489 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-18 19:21:02,489 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:21:02,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-18 19:21:02,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2021-12-18 19:21:02,490 INFO L87 Difference]: Start difference. First operand 108 states and 141 transitions. Second operand has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-18 19:21:03,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:21:03,863 INFO L93 Difference]: Finished difference Result 133 states and 176 transitions. [2021-12-18 19:21:03,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-18 19:21:03,865 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 25 [2021-12-18 19:21:03,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:21:03,866 INFO L225 Difference]: With dead ends: 133 [2021-12-18 19:21:03,866 INFO L226 Difference]: Without dead ends: 133 [2021-12-18 19:21:03,866 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=54, Invalid=288, Unknown=0, NotChecked=0, Total=342 [2021-12-18 19:21:03,867 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 62 mSDsluCounter, 393 mSDsCounter, 0 mSdLazyCounter, 440 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 466 SdHoareTripleChecker+Invalid, 546 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 88 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-12-18 19:21:03,867 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 466 Invalid, 546 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 440 Invalid, 0 Unknown, 88 Unchecked, 1.2s Time] [2021-12-18 19:21:03,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-12-18 19:21:03,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 124. [2021-12-18 19:21:03,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 81 states have (on average 1.3950617283950617) internal successors, (113), 95 states have internal predecessors, (113), 18 states have call successors, (18), 7 states have call predecessors, (18), 9 states have return successors, (31), 21 states have call predecessors, (31), 18 states have call successors, (31) [2021-12-18 19:21:03,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 162 transitions. [2021-12-18 19:21:03,889 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 162 transitions. Word has length 25 [2021-12-18 19:21:03,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:21:03,889 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 162 transitions. [2021-12-18 19:21:03,899 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-18 19:21:03,899 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 162 transitions. [2021-12-18 19:21:03,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-18 19:21:03,904 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:21:03,904 INFO L514 BasicCegarLoop]: trace histogram [3, 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] [2021-12-18 19:21:03,915 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 19:21:04,112 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 19:21:04,113 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting checkErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:21:04,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:21:04,113 INFO L85 PathProgramCache]: Analyzing trace with hash 986137240, now seen corresponding path program 1 times [2021-12-18 19:21:04,113 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:21:04,113 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [12424598] [2021-12-18 19:21:04,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 19:21:04,113 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:21:04,113 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:21:04,115 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 19:21:04,116 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 19:21:04,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 19:21:04,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-18 19:21:04,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:21:04,280 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-18 19:21:04,280 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 19:21:04,280 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:21:04,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [12424598] [2021-12-18 19:21:04,280 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [12424598] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 19:21:04,280 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 19:21:04,280 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-12-18 19:21:04,280 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526775534] [2021-12-18 19:21:04,280 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 19:21:04,281 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-18 19:21:04,281 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:21:04,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-18 19:21:04,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-12-18 19:21:04,281 INFO L87 Difference]: Start difference. First operand 124 states and 162 transitions. Second operand has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-18 19:21:04,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:21:04,482 INFO L93 Difference]: Finished difference Result 130 states and 171 transitions. [2021-12-18 19:21:04,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-18 19:21:04,482 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 31 [2021-12-18 19:21:04,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:21:04,484 INFO L225 Difference]: With dead ends: 130 [2021-12-18 19:21:04,484 INFO L226 Difference]: Without dead ends: 126 [2021-12-18 19:21:04,484 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-12-18 19:21:04,485 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 29 mSDsluCounter, 311 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 370 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 19:21:04,485 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 370 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 140 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-18 19:21:04,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-12-18 19:21:04,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 124. [2021-12-18 19:21:04,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 81 states have (on average 1.3703703703703705) internal successors, (111), 95 states have internal predecessors, (111), 18 states have call successors, (18), 7 states have call predecessors, (18), 9 states have return successors, (31), 21 states have call predecessors, (31), 18 states have call successors, (31) [2021-12-18 19:21:04,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 160 transitions. [2021-12-18 19:21:04,490 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 160 transitions. Word has length 31 [2021-12-18 19:21:04,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:21:04,490 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 160 transitions. [2021-12-18 19:21:04,490 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-18 19:21:04,490 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 160 transitions. [2021-12-18 19:21:04,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-18 19:21:04,491 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:21:04,491 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 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 19:21:04,502 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Ended with exit code 0 [2021-12-18 19:21:04,698 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 19:21:04,698 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting maxErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:21:04,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:21:04,698 INFO L85 PathProgramCache]: Analyzing trace with hash 1746105865, now seen corresponding path program 1 times [2021-12-18 19:21:04,699 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:21:04,699 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1740352629] [2021-12-18 19:21:04,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 19:21:04,699 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:21:04,699 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:21:04,704 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 19:21:04,707 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-12-18 19:21:04,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 19:21:04,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 37 conjunts are in the unsatisfiable core [2021-12-18 19:21:04,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:21:04,876 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 19:21:04,881 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 19:21:04,976 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-12-18 19:21:04,976 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 23 treesize of output 22 [2021-12-18 19:21:04,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:21:04,985 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 23 treesize of output 22 [2021-12-18 19:21:05,176 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 19:21:05,179 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 19:21:05,270 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 19:21:05,270 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:21:06,296 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 19:21:06,296 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:21:06,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1740352629] [2021-12-18 19:21:06,297 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1740352629] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 19:21:06,297 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:21:06,297 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2021-12-18 19:21:06,297 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842409166] [2021-12-18 19:21:06,297 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:21:06,297 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-18 19:21:06,297 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:21:06,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-18 19:21:06,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2021-12-18 19:21:06,298 INFO L87 Difference]: Start difference. First operand 124 states and 160 transitions. Second operand has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 4 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-18 19:21:07,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:21:07,118 INFO L93 Difference]: Finished difference Result 139 states and 178 transitions. [2021-12-18 19:21:07,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-12-18 19:21:07,119 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 4 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 31 [2021-12-18 19:21:07,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:21:07,120 INFO L225 Difference]: With dead ends: 139 [2021-12-18 19:21:07,120 INFO L226 Difference]: Without dead ends: 139 [2021-12-18 19:21:07,120 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-12-18 19:21:07,121 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 38 mSDsluCounter, 750 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 827 SdHoareTripleChecker+Invalid, 374 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 83 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-18 19:21:07,121 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 827 Invalid, 374 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 279 Invalid, 0 Unknown, 83 Unchecked, 0.6s Time] [2021-12-18 19:21:07,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-12-18 19:21:07,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 131. [2021-12-18 19:21:07,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 86 states have (on average 1.3604651162790697) internal successors, (117), 100 states have internal predecessors, (117), 18 states have call successors, (18), 9 states have call predecessors, (18), 11 states have return successors, (31), 21 states have call predecessors, (31), 18 states have call successors, (31) [2021-12-18 19:21:07,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 166 transitions. [2021-12-18 19:21:07,126 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 166 transitions. Word has length 31 [2021-12-18 19:21:07,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:21:07,126 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 166 transitions. [2021-12-18 19:21:07,126 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 4 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-18 19:21:07,126 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 166 transitions. [2021-12-18 19:21:07,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-18 19:21:07,127 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:21:07,127 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-12-18 19:21:07,139 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-12-18 19:21:07,327 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 19:21:07,328 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting nondet_treeErr4REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:21:07,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:21:07,328 INFO L85 PathProgramCache]: Analyzing trace with hash -1427695233, now seen corresponding path program 1 times [2021-12-18 19:21:07,328 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:21:07,328 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1802006715] [2021-12-18 19:21:07,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 19:21:07,328 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:21:07,328 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:21:07,331 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 19:21:07,333 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 19:21:07,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 19:21:07,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-18 19:21:07,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:21:07,463 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 19:21:07,625 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 19:21:07,625 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 19:21:07,631 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-18 19:21:07,631 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:21:07,783 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:21:07,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1802006715] [2021-12-18 19:21:07,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1802006715] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:21:07,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [504350090] [2021-12-18 19:21:07,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 19:21:07,784 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 19:21:07,784 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 19:21:07,785 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 19:21:07,810 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 19:21:07,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 19:21:07,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-18 19:21:07,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:21:07,992 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 19:21:10,251 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-18 19:21:10,251 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 19:21:10,259 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-18 19:21:10,259 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:21:10,363 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [504350090] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:21:10,363 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:21:10,363 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-12-18 19:21:10,363 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105372080] [2021-12-18 19:21:10,363 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:21:10,364 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-18 19:21:10,364 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:21:10,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-18 19:21:10,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=27, Unknown=1, NotChecked=0, Total=42 [2021-12-18 19:21:10,364 INFO L87 Difference]: Start difference. First operand 131 states and 166 transitions. Second operand has 6 states, 5 states have (on average 5.2) internal successors, (26), 6 states have internal predecessors, (26), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-12-18 19:21:14,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:21:14,620 INFO L93 Difference]: Finished difference Result 133 states and 168 transitions. [2021-12-18 19:21:14,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-18 19:21:14,621 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.2) internal successors, (26), 6 states have internal predecessors, (26), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 31 [2021-12-18 19:21:14,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:21:14,621 INFO L225 Difference]: With dead ends: 133 [2021-12-18 19:21:14,621 INFO L226 Difference]: Without dead ends: 133 [2021-12-18 19:21:14,622 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 60 SyntacticMatches, 9 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=26, Invalid=44, Unknown=2, NotChecked=0, Total=72 [2021-12-18 19:21:14,622 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 44 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 160 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 19:21:14,622 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 100 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 92 Invalid, 0 Unknown, 160 Unchecked, 0.2s Time] [2021-12-18 19:21:14,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-12-18 19:21:14,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 131. [2021-12-18 19:21:14,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 86 states have (on average 1.3604651162790697) internal successors, (117), 100 states have internal predecessors, (117), 18 states have call successors, (18), 9 states have call predecessors, (18), 11 states have return successors, (31), 21 states have call predecessors, (31), 18 states have call successors, (31) [2021-12-18 19:21:14,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 166 transitions. [2021-12-18 19:21:14,626 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 166 transitions. Word has length 31 [2021-12-18 19:21:14,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:21:14,626 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 166 transitions. [2021-12-18 19:21:14,626 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.2) internal successors, (26), 6 states have internal predecessors, (26), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-12-18 19:21:14,626 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 166 transitions. [2021-12-18 19:21:14,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-18 19:21:14,627 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:21:14,630 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-12-18 19:21:14,643 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 19:21:14,843 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 19:21:15,039 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 19:21:15,039 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting nondet_treeErr5REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:21:15,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:21:15,040 INFO L85 PathProgramCache]: Analyzing trace with hash -1427695232, now seen corresponding path program 1 times [2021-12-18 19:21:15,040 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:21:15,040 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [923540977] [2021-12-18 19:21:15,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 19:21:15,040 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:21:15,040 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:21:15,042 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 19:21:15,043 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 19:21:15,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 19:21:15,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-18 19:21:15,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:21:15,205 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 19:21:15,210 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 19:21:23,622 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:21:23,623 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 19:21:23,630 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 19:21:23,630 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 19:21:23,649 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-18 19:21:23,649 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:21:25,921 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:21:25,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [923540977] [2021-12-18 19:21:25,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [923540977] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:21:25,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [644693230] [2021-12-18 19:21:25,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 19:21:25,922 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 19:21:25,922 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 19:21:25,923 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 19:21:25,926 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 19:21:26,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 19:21:26,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-18 19:21:26,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:21:26,095 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 19:21:26,101 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 19:21:32,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:21:32,383 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 19:21:32,392 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 19:21:32,392 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 19:21:32,398 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-18 19:21:32,398 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:21:32,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [644693230] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:21:32,585 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:21:32,586 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-12-18 19:21:32,586 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [356357195] [2021-12-18 19:21:32,586 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:21:32,586 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-18 19:21:32,586 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:21:32,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-18 19:21:32,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=49, Unknown=3, NotChecked=0, Total=72 [2021-12-18 19:21:32,586 INFO L87 Difference]: Start difference. First operand 131 states and 166 transitions. Second operand has 7 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-18 19:21:32,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:21:32,821 INFO L93 Difference]: Finished difference Result 135 states and 176 transitions. [2021-12-18 19:21:32,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-18 19:21:32,821 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 31 [2021-12-18 19:21:32,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:21:32,822 INFO L225 Difference]: With dead ends: 135 [2021-12-18 19:21:32,822 INFO L226 Difference]: Without dead ends: 135 [2021-12-18 19:21:32,822 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 52 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 16.4s TimeCoverageRelationStatistics Valid=27, Invalid=60, Unknown=3, NotChecked=0, Total=90 [2021-12-18 19:21:32,823 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 44 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 94 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 19:21:32,823 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 110 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 167 Invalid, 0 Unknown, 94 Unchecked, 0.2s Time] [2021-12-18 19:21:32,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-12-18 19:21:32,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 131. [2021-12-18 19:21:32,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 86 states have (on average 1.3604651162790697) internal successors, (117), 100 states have internal predecessors, (117), 18 states have call successors, (18), 9 states have call predecessors, (18), 11 states have return successors, (31), 21 states have call predecessors, (31), 18 states have call successors, (31) [2021-12-18 19:21:32,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 166 transitions. [2021-12-18 19:21:32,827 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 166 transitions. Word has length 31 [2021-12-18 19:21:32,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:21:32,827 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 166 transitions. [2021-12-18 19:21:32,827 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-18 19:21:32,827 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 166 transitions. [2021-12-18 19:21:32,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-12-18 19:21:32,828 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:21:32,828 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1] [2021-12-18 19:21:32,838 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 19:21:33,039 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 19:21:33,238 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 19:21:33,239 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:21:33,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:21:33,239 INFO L85 PathProgramCache]: Analyzing trace with hash 1805515892, now seen corresponding path program 2 times [2021-12-18 19:21:33,239 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:21:33,240 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2130384256] [2021-12-18 19:21:33,240 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-18 19:21:33,240 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:21:33,240 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:21:33,241 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 19:21:33,246 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 19:21:33,419 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-18 19:21:33,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:21:33,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-18 19:21:33,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:21:33,451 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 19:21:39,841 INFO L354 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2021-12-18 19:21:39,841 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 4 case distinctions, treesize of input 23 treesize of output 39 [2021-12-18 19:21:39,855 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 41 proven. 27 refuted. 3 times theorem prover too weak. 19 trivial. 0 not checked. [2021-12-18 19:21:39,856 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:21:41,975 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:21:41,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2130384256] [2021-12-18 19:21:41,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2130384256] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:21:41,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [8896766] [2021-12-18 19:21:41,975 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-18 19:21:41,975 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 19:21:41,975 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 19:21:41,976 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 19:21:41,978 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 19:21:42,201 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-18 19:21:42,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1263244963] [2021-12-18 19:21:42,201 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-18 19:21:42,201 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 19:21:42,202 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 19:21:42,207 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 19:21:42,208 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 1 [2021-12-18 19:21:42,210 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-12-18 19:21:42,420 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-18 19:21:42,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:21:42,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-18 19:21:42,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:21:42,443 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 19:21:56,960 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 19:21:56,984 INFO L354 Elim1Store]: treesize reduction 24, result has 46.7 percent of original size [2021-12-18 19:21:56,984 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 2 case distinctions, treesize of input 18 treesize of output 32 [2021-12-18 19:21:57,003 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 41 proven. 30 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-12-18 19:21:57,004 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:21:57,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1263244963] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:21:57,167 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:21:57,167 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2021-12-18 19:21:57,167 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144444964] [2021-12-18 19:21:57,167 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:21:57,167 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-18 19:21:57,168 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:21:57,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-18 19:21:57,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=93, Unknown=8, NotChecked=0, Total=132 [2021-12-18 19:21:57,168 INFO L87 Difference]: Start difference. First operand 131 states and 166 transitions. Second operand has 10 states, 9 states have (on average 4.333333333333333) internal successors, (39), 9 states have internal predecessors, (39), 7 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (9), 6 states have call predecessors, (9), 7 states have call successors, (9) [2021-12-18 19:22:17,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:22:17,469 INFO L93 Difference]: Finished difference Result 169 states and 223 transitions. [2021-12-18 19:22:17,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-18 19:22:17,470 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 4.333333333333333) internal successors, (39), 9 states have internal predecessors, (39), 7 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (9), 6 states have call predecessors, (9), 7 states have call successors, (9) Word has length 49 [2021-12-18 19:22:17,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:22:17,471 INFO L225 Difference]: With dead ends: 169 [2021-12-18 19:22:17,471 INFO L226 Difference]: Without dead ends: 169 [2021-12-18 19:22:17,471 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 91 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 42.6s TimeCoverageRelationStatistics Valid=84, Invalid=175, Unknown=13, NotChecked=0, Total=272 [2021-12-18 19:22:17,471 INFO L933 BasicCegarLoop]: 85 mSDtfsCounter, 12 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 410 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 378 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 19:22:17,471 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 222 Invalid, 410 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 29 Invalid, 0 Unknown, 378 Unchecked, 0.1s Time] [2021-12-18 19:22:17,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-12-18 19:22:17,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 168. [2021-12-18 19:22:17,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 112 states have (on average 1.3125) internal successors, (147), 127 states have internal predecessors, (147), 23 states have call successors, (23), 12 states have call predecessors, (23), 17 states have return successors, (53), 28 states have call predecessors, (53), 23 states have call successors, (53) [2021-12-18 19:22:17,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 223 transitions. [2021-12-18 19:22:17,476 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 223 transitions. Word has length 49 [2021-12-18 19:22:17,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:22:17,477 INFO L470 AbstractCegarLoop]: Abstraction has 168 states and 223 transitions. [2021-12-18 19:22:17,477 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 4.333333333333333) internal successors, (39), 9 states have internal predecessors, (39), 7 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (9), 6 states have call predecessors, (9), 7 states have call successors, (9) [2021-12-18 19:22:17,477 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 223 transitions. [2021-12-18 19:22:17,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-12-18 19:22:17,477 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:22:17,477 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 1, 1, 1, 1] [2021-12-18 19:22:17,488 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Ended with exit code 0 [2021-12-18 19:22:17,695 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2021-12-18 19:22:17,878 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 19:22:17,878 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting nondet_treeErr4REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:22:17,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:22:17,878 INFO L85 PathProgramCache]: Analyzing trace with hash 917383077, now seen corresponding path program 2 times [2021-12-18 19:22:17,879 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:22:17,879 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [782685501] [2021-12-18 19:22:17,879 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-18 19:22:17,879 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:22:17,879 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:22:17,883 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 19:22:17,884 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 19:22:18,108 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-18 19:22:18,108 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:22:18,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 19 conjunts are in the unsatisfiable core [2021-12-18 19:22:18,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:22:18,139 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 19:22:22,555 INFO L354 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2021-12-18 19:22:22,555 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 4 case distinctions, treesize of input 23 treesize of output 39 [2021-12-18 19:22:22,570 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 48 proven. 34 refuted. 6 times theorem prover too weak. 30 trivial. 0 not checked. [2021-12-18 19:22:22,570 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:22:24,701 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:22:24,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [782685501] [2021-12-18 19:22:24,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [782685501] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:22:24,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [21022205] [2021-12-18 19:22:24,701 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-18 19:22:24,702 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 19:22:24,702 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 19:22:24,702 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 19:22:24,705 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 19:22:24,927 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-18 19:22:24,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1749013825] [2021-12-18 19:22:24,928 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-18 19:22:24,928 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 19:22:24,928 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 19:22:24,929 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 19:22:24,930 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-12-18 19:22:24,941 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 1 [2021-12-18 19:22:25,072 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-18 19:22:25,072 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:22:25,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 19 conjunts are in the unsatisfiable core [2021-12-18 19:22:25,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:22:25,105 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 19:22:32,845 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 19:22:32,867 INFO L354 Elim1Store]: treesize reduction 24, result has 46.7 percent of original size [2021-12-18 19:22:32,868 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 2 case distinctions, treesize of input 18 treesize of output 32 [2021-12-18 19:22:32,886 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 48 proven. 40 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-12-18 19:22:32,887 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:22:33,185 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1749013825] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:22:33,186 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:22:33,186 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2021-12-18 19:22:33,186 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265061471] [2021-12-18 19:22:33,186 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:22:33,186 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-18 19:22:33,186 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:22:33,186 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-18 19:22:33,186 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=125, Unknown=5, NotChecked=0, Total=182 [2021-12-18 19:22:33,187 INFO L87 Difference]: Start difference. First operand 168 states and 223 transitions. Second operand has 10 states, 9 states have (on average 4.555555555555555) internal successors, (41), 9 states have internal predecessors, (41), 5 states have call successors, (11), 2 states have call predecessors, (11), 5 states have return successors, (10), 7 states have call predecessors, (10), 5 states have call successors, (10) [2021-12-18 19:22:47,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:22:47,605 INFO L93 Difference]: Finished difference Result 184 states and 257 transitions. [2021-12-18 19:22:47,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-18 19:22:47,609 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 4.555555555555555) internal successors, (41), 9 states have internal predecessors, (41), 5 states have call successors, (11), 2 states have call predecessors, (11), 5 states have return successors, (10), 7 states have call predecessors, (10), 5 states have call successors, (10) Word has length 55 [2021-12-18 19:22:47,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:22:47,610 INFO L225 Difference]: With dead ends: 184 [2021-12-18 19:22:47,611 INFO L226 Difference]: Without dead ends: 184 [2021-12-18 19:22:47,611 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 101 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 28.0s TimeCoverageRelationStatistics Valid=90, Invalid=175, Unknown=7, NotChecked=0, Total=272 [2021-12-18 19:22:47,611 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 19 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 190 SdHoareTripleChecker+Invalid, 328 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 296 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 19:22:47,611 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 190 Invalid, 328 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 29 Invalid, 0 Unknown, 296 Unchecked, 0.1s Time] [2021-12-18 19:22:47,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2021-12-18 19:22:47,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 182. [2021-12-18 19:22:47,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 122 states have (on average 1.2868852459016393) internal successors, (157), 138 states have internal predecessors, (157), 25 states have call successors, (25), 12 states have call predecessors, (25), 19 states have return successors, (73), 31 states have call predecessors, (73), 25 states have call successors, (73) [2021-12-18 19:22:47,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 255 transitions. [2021-12-18 19:22:47,616 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 255 transitions. Word has length 55 [2021-12-18 19:22:47,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:22:47,616 INFO L470 AbstractCegarLoop]: Abstraction has 182 states and 255 transitions. [2021-12-18 19:22:47,617 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 4.555555555555555) internal successors, (41), 9 states have internal predecessors, (41), 5 states have call successors, (11), 2 states have call predecessors, (11), 5 states have return successors, (10), 7 states have call predecessors, (10), 5 states have call successors, (10) [2021-12-18 19:22:47,617 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 255 transitions. [2021-12-18 19:22:47,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-12-18 19:22:47,617 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:22:47,617 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1] [2021-12-18 19:22:47,635 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-12-18 19:22:47,826 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 19:22:48,026 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 19:22:48,026 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting nondet_treeErr3REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:22:48,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:22:48,027 INFO L85 PathProgramCache]: Analyzing trace with hash 1805515893, now seen corresponding path program 2 times [2021-12-18 19:22:48,027 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:22:48,027 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [595974243] [2021-12-18 19:22:48,027 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-18 19:22:48,027 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:22:48,027 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:22:48,028 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 19:22:48,033 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-12-18 19:22:48,293 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-18 19:22:48,293 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:22:48,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-18 19:22:48,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:22:48,325 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 19:22:48,330 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 19:22:50,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:22:50,624 INFO L354 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-12-18 19:22:50,625 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 2 case distinctions, treesize of input 15 treesize of output 23 [2021-12-18 19:22:50,634 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 19:22:50,634 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 19:22:50,680 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 41 proven. 34 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-18 19:22:50,680 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:22:54,958 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:22:54,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [595974243] [2021-12-18 19:22:54,958 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [595974243] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:22:54,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [403420542] [2021-12-18 19:22:54,958 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-18 19:22:54,958 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 19:22:54,958 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 19:22:54,959 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 19:22:54,965 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-12-18 19:22:55,242 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-18 19:22:55,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:22:55,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-18 19:22:55,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:22:55,275 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 19:22:55,281 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 19:22:59,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:22:59,566 INFO L354 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-12-18 19:22:59,566 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 2 case distinctions, treesize of input 15 treesize of output 23 [2021-12-18 19:22:59,584 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 19:22:59,585 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 19:22:59,635 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 41 proven. 34 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-18 19:22:59,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:23:06,335 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [403420542] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:23:06,335 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:23:06,335 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2021-12-18 19:23:06,335 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202469522] [2021-12-18 19:23:06,335 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:23:06,336 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-18 19:23:06,336 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:23:06,336 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-18 19:23:06,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=83, Unknown=3, NotChecked=0, Total=110 [2021-12-18 19:23:06,336 INFO L87 Difference]: Start difference. First operand 182 states and 255 transitions. Second operand has 9 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 5 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-18 19:23:10,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:23:10,612 INFO L93 Difference]: Finished difference Result 208 states and 300 transitions. [2021-12-18 19:23:10,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-18 19:23:10,612 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 5 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 49 [2021-12-18 19:23:10,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:23:10,613 INFO L225 Difference]: With dead ends: 208 [2021-12-18 19:23:10,614 INFO L226 Difference]: Without dead ends: 208 [2021-12-18 19:23:10,614 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 89 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 20.9s TimeCoverageRelationStatistics Valid=40, Invalid=111, Unknown=5, NotChecked=0, Total=156 [2021-12-18 19:23:10,614 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 44 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 164 SdHoareTripleChecker+Invalid, 407 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 242 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 19:23:10,614 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 164 Invalid, 407 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 155 Invalid, 0 Unknown, 242 Unchecked, 0.2s Time] [2021-12-18 19:23:10,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-12-18 19:23:10,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 208. [2021-12-18 19:23:10,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 140 states have (on average 1.2571428571428571) internal successors, (176), 158 states have internal predecessors, (176), 29 states have call successors, (29), 14 states have call predecessors, (29), 23 states have return successors, (95), 35 states have call predecessors, (95), 29 states have call successors, (95) [2021-12-18 19:23:10,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 300 transitions. [2021-12-18 19:23:10,626 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 300 transitions. Word has length 49 [2021-12-18 19:23:10,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:23:10,626 INFO L470 AbstractCegarLoop]: Abstraction has 208 states and 300 transitions. [2021-12-18 19:23:10,626 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 5 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-18 19:23:10,626 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 300 transitions. [2021-12-18 19:23:10,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-12-18 19:23:10,627 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:23:10,628 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 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, 1] [2021-12-18 19:23:10,632 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2021-12-18 19:23:10,841 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-12-18 19:23:11,040 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 19:23:11,040 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting maxErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:23:11,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:23:11,041 INFO L85 PathProgramCache]: Analyzing trace with hash -612022781, now seen corresponding path program 1 times [2021-12-18 19:23:11,042 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:23:11,042 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [832103896] [2021-12-18 19:23:11,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 19:23:11,042 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:23:11,042 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:23:11,043 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 19:23:11,046 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-12-18 19:23:11,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 19:23:11,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 29 conjunts are in the unsatisfiable core [2021-12-18 19:23:11,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:23:11,276 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 19:23:11,287 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 19:23:11,556 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 19:23:11,559 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 19:23:11,637 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-18 19:23:11,637 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:23:11,904 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-18 19:23:11,904 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:23:11,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [832103896] [2021-12-18 19:23:11,904 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [832103896] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 19:23:11,904 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:23:11,904 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 14 [2021-12-18 19:23:11,904 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1512728087] [2021-12-18 19:23:11,904 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:23:11,904 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-12-18 19:23:11,904 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:23:11,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-12-18 19:23:11,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2021-12-18 19:23:11,905 INFO L87 Difference]: Start difference. First operand 208 states and 300 transitions. Second operand has 14 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 10 states have internal predecessors, (31), 4 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-18 19:23:12,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:23:12,274 INFO L93 Difference]: Finished difference Result 248 states and 363 transitions. [2021-12-18 19:23:12,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-18 19:23:12,299 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 10 states have internal predecessors, (31), 4 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) Word has length 38 [2021-12-18 19:23:12,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:23:12,300 INFO L225 Difference]: With dead ends: 248 [2021-12-18 19:23:12,300 INFO L226 Difference]: Without dead ends: 248 [2021-12-18 19:23:12,301 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2021-12-18 19:23:12,301 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 40 mSDsluCounter, 600 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 676 SdHoareTripleChecker+Invalid, 217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 31 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 19:23:12,301 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 676 Invalid, 217 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 184 Invalid, 0 Unknown, 31 Unchecked, 0.2s Time] [2021-12-18 19:23:12,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2021-12-18 19:23:12,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 241. [2021-12-18 19:23:12,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 165 states have (on average 1.2787878787878788) internal successors, (211), 183 states have internal predecessors, (211), 33 states have call successors, (33), 17 states have call predecessors, (33), 27 states have return successors, (119), 40 states have call predecessors, (119), 33 states have call successors, (119) [2021-12-18 19:23:12,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 363 transitions. [2021-12-18 19:23:12,309 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 363 transitions. Word has length 38 [2021-12-18 19:23:12,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:23:12,310 INFO L470 AbstractCegarLoop]: Abstraction has 241 states and 363 transitions. [2021-12-18 19:23:12,310 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 10 states have internal predecessors, (31), 4 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-18 19:23:12,310 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 363 transitions. [2021-12-18 19:23:12,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-18 19:23:12,311 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:23:12,311 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 19:23:12,323 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-12-18 19:23:12,518 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 19:23:12,518 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting maxErr1REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:23:12,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:23:12,519 INFO L85 PathProgramCache]: Analyzing trace with hash -101280226, now seen corresponding path program 2 times [2021-12-18 19:23:12,519 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:23:12,519 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1069845593] [2021-12-18 19:23:12,519 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-18 19:23:12,519 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:23:12,519 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:23:12,520 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 19:23:12,522 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 19:23:12,663 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-18 19:23:12,664 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:23:12,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 15 conjunts are in the unsatisfiable core [2021-12-18 19:23:12,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:23:12,872 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-18 19:23:12,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:23:13,379 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 22 treesize of output 18 [2021-12-18 19:23:13,498 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-18 19:23:13,499 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:23:13,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1069845593] [2021-12-18 19:23:13,499 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1069845593] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 19:23:13,499 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:23:13,499 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2021-12-18 19:23:13,499 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873705257] [2021-12-18 19:23:13,499 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:23:13,500 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-18 19:23:13,500 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:23:13,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-18 19:23:13,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=202, Unknown=0, NotChecked=0, Total=240 [2021-12-18 19:23:13,500 INFO L87 Difference]: Start difference. First operand 241 states and 363 transitions. Second operand has 16 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 3 states have call successors, (8) [2021-12-18 19:23:14,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:23:14,495 INFO L93 Difference]: Finished difference Result 243 states and 362 transitions. [2021-12-18 19:23:14,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-18 19:23:14,497 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 3 states have call successors, (8) Word has length 39 [2021-12-18 19:23:14,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:23:14,498 INFO L225 Difference]: With dead ends: 243 [2021-12-18 19:23:14,498 INFO L226 Difference]: Without dead ends: 243 [2021-12-18 19:23:14,498 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2021-12-18 19:23:14,499 INFO L933 BasicCegarLoop]: 70 mSDtfsCounter, 91 mSDsluCounter, 398 mSDsCounter, 0 mSdLazyCounter, 351 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 468 SdHoareTripleChecker+Invalid, 371 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 351 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-12-18 19:23:14,499 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 468 Invalid, 371 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 351 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-12-18 19:23:14,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2021-12-18 19:23:14,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 243. [2021-12-18 19:23:14,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 166 states have (on average 1.2409638554216869) internal successors, (206), 185 states have internal predecessors, (206), 33 states have call successors, (33), 17 states have call predecessors, (33), 28 states have return successors, (123), 40 states have call predecessors, (123), 33 states have call successors, (123) [2021-12-18 19:23:14,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 362 transitions. [2021-12-18 19:23:14,508 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 362 transitions. Word has length 39 [2021-12-18 19:23:14,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:23:14,509 INFO L470 AbstractCegarLoop]: Abstraction has 243 states and 362 transitions. [2021-12-18 19:23:14,509 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 3 states have call successors, (8) [2021-12-18 19:23:14,509 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 362 transitions. [2021-12-18 19:23:14,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-12-18 19:23:14,510 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:23:14,510 INFO L514 BasicCegarLoop]: trace histogram [8, 6, 6, 6, 6, 6, 6, 5, 5, 5, 2, 2, 2, 1, 1, 1, 1] [2021-12-18 19:23:14,520 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (30)] Forceful destruction successful, exit code 0 [2021-12-18 19:23:14,718 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 19:23:14,719 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:23:14,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:23:14,719 INFO L85 PathProgramCache]: Analyzing trace with hash -1227048232, now seen corresponding path program 3 times [2021-12-18 19:23:14,719 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:23:14,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [715855337] [2021-12-18 19:23:14,720 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-18 19:23:14,720 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:23:14,720 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:23:14,723 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 19:23:14,725 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-12-18 19:23:15,033 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-12-18 19:23:15,033 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:23:15,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-18 19:23:15,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:23:15,082 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 19:23:23,532 INFO L354 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2021-12-18 19:23:23,532 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 4 case distinctions, treesize of input 23 treesize of output 39 [2021-12-18 19:23:23,547 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 113 proven. 25 refuted. 5 times theorem prover too weak. 61 trivial. 0 not checked. [2021-12-18 19:23:23,548 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:23:25,689 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:23:25,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [715855337] [2021-12-18 19:23:25,690 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [715855337] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:23:25,690 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [898797977] [2021-12-18 19:23:25,690 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-18 19:23:25,690 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 19:23:25,690 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 19:23:25,691 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 19:23:25,692 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-12-18 19:23:26,084 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-12-18 19:23:26,084 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:23:26,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-18 19:23:26,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:23:36,586 INFO L354 Elim1Store]: treesize reduction 34, result has 38.2 percent of original size [2021-12-18 19:23:36,586 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 2 case distinctions, treesize of input 18 treesize of output 32 [2021-12-18 19:23:36,606 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 112 proven. 27 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2021-12-18 19:23:36,606 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:23:36,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [898797977] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:23:36,954 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:23:36,954 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2021-12-18 19:23:36,954 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260339525] [2021-12-18 19:23:36,954 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:23:36,954 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-18 19:23:36,954 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:23:36,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-18 19:23:36,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=124, Unknown=6, NotChecked=0, Total=182 [2021-12-18 19:23:36,955 INFO L87 Difference]: Start difference. First operand 243 states and 362 transitions. Second operand has 10 states, 9 states have (on average 4.333333333333333) internal successors, (39), 9 states have internal predecessors, (39), 5 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (9), 7 states have call predecessors, (9), 5 states have call successors, (9) [2021-12-18 19:23:45,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:23:45,641 INFO L93 Difference]: Finished difference Result 249 states and 367 transitions. [2021-12-18 19:23:45,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-18 19:23:45,642 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 4.333333333333333) internal successors, (39), 9 states have internal predecessors, (39), 5 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (9), 7 states have call predecessors, (9), 5 states have call successors, (9) Word has length 69 [2021-12-18 19:23:45,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:23:45,644 INFO L225 Difference]: With dead ends: 249 [2021-12-18 19:23:45,644 INFO L226 Difference]: Without dead ends: 249 [2021-12-18 19:23:45,644 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 120 SyntacticMatches, 16 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 29.0s TimeCoverageRelationStatistics Valid=87, Invalid=179, Unknown=6, NotChecked=0, Total=272 [2021-12-18 19:23:45,644 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 55 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 451 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 343 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 19:23:45,644 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 126 Invalid, 451 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 97 Invalid, 0 Unknown, 343 Unchecked, 0.2s Time] [2021-12-18 19:23:45,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2021-12-18 19:23:45,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 247. [2021-12-18 19:23:45,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 247 states, 169 states have (on average 1.242603550295858) internal successors, (210), 188 states have internal predecessors, (210), 33 states have call successors, (33), 17 states have call predecessors, (33), 29 states have return successors, (124), 41 states have call predecessors, (124), 33 states have call successors, (124) [2021-12-18 19:23:45,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 367 transitions. [2021-12-18 19:23:45,652 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 367 transitions. Word has length 69 [2021-12-18 19:23:45,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:23:45,653 INFO L470 AbstractCegarLoop]: Abstraction has 247 states and 367 transitions. [2021-12-18 19:23:45,654 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 4.333333333333333) internal successors, (39), 9 states have internal predecessors, (39), 5 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (9), 7 states have call predecessors, (9), 5 states have call successors, (9) [2021-12-18 19:23:45,654 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 367 transitions. [2021-12-18 19:23:45,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-18 19:23:45,655 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:23:45,655 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2021-12-18 19:23:45,667 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-12-18 19:23:45,859 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (32)] Forceful destruction successful, exit code 0 [2021-12-18 19:23:46,055 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2021-12-18 19:23:46,056 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting nondet_treeErr3REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:23:46,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:23:46,056 INFO L85 PathProgramCache]: Analyzing trace with hash -1830162109, now seen corresponding path program 3 times [2021-12-18 19:23:46,056 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:23:46,056 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1829227479] [2021-12-18 19:23:46,056 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-18 19:23:46,057 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:23:46,057 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:23:46,058 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 19:23:46,059 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-12-18 19:23:46,324 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-12-18 19:23:46,325 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:23:46,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 19 conjunts are in the unsatisfiable core [2021-12-18 19:23:46,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:23:46,342 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 19:23:46,539 INFO L354 Elim1Store]: treesize reduction 44, result has 20.0 percent of original size [2021-12-18 19:23:46,539 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 2 case distinctions, treesize of input 15 treesize of output 19 [2021-12-18 19:23:46,550 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 11 proven. 24 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-12-18 19:23:46,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:23:46,920 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:23:46,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1829227479] [2021-12-18 19:23:46,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1829227479] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:23:46,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [588798619] [2021-12-18 19:23:46,920 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-18 19:23:46,920 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 19:23:46,920 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 19:23:46,921 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 19:23:46,923 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-12-18 19:23:47,282 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-12-18 19:23:47,282 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:23:47,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 25 conjunts are in the unsatisfiable core [2021-12-18 19:23:47,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:23:47,312 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 19:23:47,319 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 19:23:59,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:23:59,963 INFO L354 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-12-18 19:23:59,963 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 2 case distinctions, treesize of input 15 treesize of output 23 [2021-12-18 19:23:59,977 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 19:23:59,977 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 19:23:59,998 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 5 proven. 34 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-18 19:23:59,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:24:08,970 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [588798619] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:24:08,970 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:24:08,970 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 10] total 12 [2021-12-18 19:24:08,971 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352288213] [2021-12-18 19:24:08,971 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:24:08,971 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-18 19:24:08,971 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:24:08,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-18 19:24:08,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=190, Unknown=7, NotChecked=0, Total=240 [2021-12-18 19:24:08,972 INFO L87 Difference]: Start difference. First operand 247 states and 367 transitions. Second operand has 13 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 6 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (8), 6 states have call predecessors, (8), 5 states have call successors, (8) [2021-12-18 19:24:35,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:24:35,528 INFO L93 Difference]: Finished difference Result 304 states and 505 transitions. [2021-12-18 19:24:35,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-12-18 19:24:35,530 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 6 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (8), 6 states have call predecessors, (8), 5 states have call successors, (8) Word has length 39 [2021-12-18 19:24:35,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:24:35,532 INFO L225 Difference]: With dead ends: 304 [2021-12-18 19:24:35,532 INFO L226 Difference]: Without dead ends: 304 [2021-12-18 19:24:35,532 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 66 SyntacticMatches, 4 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 47.6s TimeCoverageRelationStatistics Valid=122, Invalid=459, Unknown=19, NotChecked=0, Total=600 [2021-12-18 19:24:35,533 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 59 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 239 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 554 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 239 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 296 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-18 19:24:35,533 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 189 Invalid, 554 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 239 Invalid, 0 Unknown, 296 Unchecked, 0.4s Time] [2021-12-18 19:24:35,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2021-12-18 19:24:35,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 290. [2021-12-18 19:24:35,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 290 states, 199 states have (on average 1.2160804020100502) internal successors, (242), 221 states have internal predecessors, (242), 39 states have call successors, (39), 20 states have call predecessors, (39), 36 states have return successors, (156), 48 states have call predecessors, (156), 39 states have call successors, (156) [2021-12-18 19:24:35,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 437 transitions. [2021-12-18 19:24:35,549 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 437 transitions. Word has length 39 [2021-12-18 19:24:35,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:24:35,550 INFO L470 AbstractCegarLoop]: Abstraction has 290 states and 437 transitions. [2021-12-18 19:24:35,550 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 6 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (8), 6 states have call predecessors, (8), 5 states have call successors, (8) [2021-12-18 19:24:35,550 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 437 transitions. [2021-12-18 19:24:35,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-18 19:24:35,551 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:24:35,551 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1] [2021-12-18 19:24:35,556 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (34)] Forceful destruction successful, exit code 0 [2021-12-18 19:24:35,765 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-12-18 19:24:35,956 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 19:24:35,956 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting nondet_treeErr4REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:24:35,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:24:35,956 INFO L85 PathProgramCache]: Analyzing trace with hash 1219497203, now seen corresponding path program 3 times [2021-12-18 19:24:35,957 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:24:35,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1156022251] [2021-12-18 19:24:35,957 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-18 19:24:35,957 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:24:35,957 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:24:35,958 INFO L229 MonitoredProcess]: Starting monitored process 35 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 19:24:35,958 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-12-18 19:24:36,226 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-12-18 19:24:36,227 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:24:36,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-18 19:24:36,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:24:36,245 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 19:24:48,590 INFO L354 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2021-12-18 19:24:48,590 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 4 case distinctions, treesize of input 23 treesize of output 39 [2021-12-18 19:24:48,605 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 11 proven. 33 refuted. 2 times theorem prover too weak. 27 trivial. 0 not checked. [2021-12-18 19:24:48,605 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:24:49,291 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:24:49,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1156022251] [2021-12-18 19:24:49,291 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1156022251] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:24:49,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [630024988] [2021-12-18 19:24:49,291 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-18 19:24:49,291 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 19:24:49,291 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 19:24:49,292 INFO L229 MonitoredProcess]: Starting monitored process 36 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 19:24:49,293 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-12-18 19:24:49,543 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-18 19:24:49,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [604267528] [2021-12-18 19:24:49,543 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-18 19:24:49,543 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 19:24:49,544 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 19:24:49,545 INFO L229 MonitoredProcess]: Starting monitored process 37 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 19:24:49,545 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-12-18 19:24:49,547 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (36)] Ended with exit code 1 [2021-12-18 19:24:50,877 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-12-18 19:24:50,877 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:24:50,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 19 conjunts are in the unsatisfiable core [2021-12-18 19:24:50,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:24:50,892 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 19:25:00,709 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 19:25:00,731 INFO L354 Elim1Store]: treesize reduction 24, result has 46.7 percent of original size [2021-12-18 19:25:00,731 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 2 case distinctions, treesize of input 18 treesize of output 32 [2021-12-18 19:25:00,746 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 6 proven. 37 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-12-18 19:25:00,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:25:00,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [604267528] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:25:00,937 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:25:00,937 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 11 [2021-12-18 19:25:00,937 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1402471050] [2021-12-18 19:25:00,937 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:25:00,937 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-18 19:25:00,937 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:25:00,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-18 19:25:00,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=116, Unknown=8, NotChecked=0, Total=182 [2021-12-18 19:25:00,938 INFO L87 Difference]: Start difference. First operand 290 states and 437 transitions. Second operand has 12 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 12 states have internal predecessors, (37), 9 states have call successors, (10), 2 states have call predecessors, (10), 4 states have return successors, (11), 6 states have call predecessors, (11), 8 states have call successors, (11) [2021-12-18 19:25:27,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:25:27,885 INFO L93 Difference]: Finished difference Result 311 states and 476 transitions. [2021-12-18 19:25:27,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-18 19:25:27,885 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 12 states have internal predecessors, (37), 9 states have call successors, (10), 2 states have call predecessors, (10), 4 states have return successors, (11), 6 states have call predecessors, (11), 8 states have call successors, (11) Word has length 45 [2021-12-18 19:25:27,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:25:27,893 INFO L225 Difference]: With dead ends: 311 [2021-12-18 19:25:27,893 INFO L226 Difference]: Without dead ends: 311 [2021-12-18 19:25:27,893 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 81 SyntacticMatches, 12 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 49.2s TimeCoverageRelationStatistics Valid=114, Invalid=216, Unknown=12, NotChecked=0, Total=342 [2021-12-18 19:25:27,894 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 21 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 374 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 324 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 19:25:27,894 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 211 Invalid, 374 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 45 Invalid, 0 Unknown, 324 Unchecked, 0.1s Time] [2021-12-18 19:25:27,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 311 states. [2021-12-18 19:25:27,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 311 to 304. [2021-12-18 19:25:27,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 304 states, 209 states have (on average 1.2057416267942584) internal successors, (252), 231 states have internal predecessors, (252), 41 states have call successors, (41), 20 states have call predecessors, (41), 38 states have return successors, (175), 52 states have call predecessors, (175), 41 states have call successors, (175) [2021-12-18 19:25:27,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 468 transitions. [2021-12-18 19:25:27,905 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 468 transitions. Word has length 45 [2021-12-18 19:25:27,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:25:27,905 INFO L470 AbstractCegarLoop]: Abstraction has 304 states and 468 transitions. [2021-12-18 19:25:27,906 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 12 states have internal predecessors, (37), 9 states have call successors, (10), 2 states have call predecessors, (10), 4 states have return successors, (11), 6 states have call predecessors, (11), 8 states have call successors, (11) [2021-12-18 19:25:27,906 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 468 transitions. [2021-12-18 19:25:27,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-18 19:25:27,906 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:25:27,907 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1] [2021-12-18 19:25:27,918 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-12-18 19:25:28,138 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-12-18 19:25:28,318 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,37 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 19:25:28,318 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting nondet_treeErr5REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:25:28,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:25:28,319 INFO L85 PathProgramCache]: Analyzing trace with hash 1219497204, now seen corresponding path program 2 times [2021-12-18 19:25:28,319 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:25:28,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1638192740] [2021-12-18 19:25:28,319 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-18 19:25:28,319 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:25:28,320 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:25:28,352 INFO L229 MonitoredProcess]: Starting monitored process 38 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 19:25:28,353 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-12-18 19:25:28,632 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-18 19:25:28,632 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:25:28,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 26 conjunts are in the unsatisfiable core [2021-12-18 19:25:28,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:25:28,652 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 19:25:28,658 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 19:25:35,064 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:25:35,091 INFO L354 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-12-18 19:25:35,091 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 2 case distinctions, treesize of input 15 treesize of output 23 [2021-12-18 19:25:35,104 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 19:25:35,104 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 19:25:35,163 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 6 proven. 54 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-18 19:25:35,163 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:25:37,683 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:25:37,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1638192740] [2021-12-18 19:25:37,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1638192740] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:25:37,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1051357035] [2021-12-18 19:25:37,684 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-18 19:25:37,684 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 19:25:37,684 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 19:25:37,685 INFO L229 MonitoredProcess]: Starting monitored process 39 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 19:25:37,689 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (39)] Waiting until timeout for monitored process [2021-12-18 19:25:38,011 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-18 19:25:38,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:25:38,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 26 conjunts are in the unsatisfiable core [2021-12-18 19:25:38,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:25:38,028 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 19:25:38,039 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 19:25:40,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:25:40,424 INFO L354 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-12-18 19:25:40,424 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 2 case distinctions, treesize of input 15 treesize of output 23 [2021-12-18 19:25:40,440 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 19:25:40,440 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 19:25:40,462 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 6 proven. 54 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-18 19:25:40,462 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:25:44,274 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1051357035] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:25:44,274 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:25:44,274 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2021-12-18 19:25:44,275 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [59487506] [2021-12-18 19:25:44,275 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:25:44,275 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-18 19:25:44,275 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:25:44,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-18 19:25:44,275 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=82, Unknown=4, NotChecked=0, Total=110 [2021-12-18 19:25:44,275 INFO L87 Difference]: Start difference. First operand 304 states and 468 transitions. Second operand has 9 states, 8 states have (on average 3.5) internal successors, (28), 8 states have internal predecessors, (28), 5 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-12-18 19:25:51,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:25:51,210 INFO L93 Difference]: Finished difference Result 361 states and 569 transitions. [2021-12-18 19:25:51,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-18 19:25:51,212 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.5) internal successors, (28), 8 states have internal predecessors, (28), 5 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 45 [2021-12-18 19:25:51,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:25:51,213 INFO L225 Difference]: With dead ends: 361 [2021-12-18 19:25:51,213 INFO L226 Difference]: Without dead ends: 361 [2021-12-18 19:25:51,213 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 82 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 21.0s TimeCoverageRelationStatistics Valid=52, Invalid=124, Unknown=6, NotChecked=0, Total=182 [2021-12-18 19:25:51,214 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 84 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 230 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 19:25:51,214 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 136 Invalid, 337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 85 Invalid, 0 Unknown, 230 Unchecked, 0.2s Time] [2021-12-18 19:25:51,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 361 states. [2021-12-18 19:25:51,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 361 to 356. [2021-12-18 19:25:51,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 356 states, 245 states have (on average 1.1918367346938776) internal successors, (292), 271 states have internal predecessors, (292), 49 states have call successors, (49), 24 states have call predecessors, (49), 46 states have return successors, (223), 60 states have call predecessors, (223), 49 states have call successors, (223) [2021-12-18 19:25:51,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 356 states to 356 states and 564 transitions. [2021-12-18 19:25:51,249 INFO L78 Accepts]: Start accepts. Automaton has 356 states and 564 transitions. Word has length 45 [2021-12-18 19:25:51,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:25:51,250 INFO L470 AbstractCegarLoop]: Abstraction has 356 states and 564 transitions. [2021-12-18 19:25:51,250 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.5) internal successors, (28), 8 states have internal predecessors, (28), 5 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-12-18 19:25:51,250 INFO L276 IsEmpty]: Start isEmpty. Operand 356 states and 564 transitions. [2021-12-18 19:25:51,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-12-18 19:25:51,251 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:25:51,251 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1] [2021-12-18 19:25:51,279 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (38)] Forceful destruction successful, exit code 0 [2021-12-18 19:25:51,469 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (39)] Forceful destruction successful, exit code 0 [2021-12-18 19:25:51,660 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,39 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2021-12-18 19:25:51,660 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting nondet_treeErr5REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:25:51,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:25:51,660 INFO L85 PathProgramCache]: Analyzing trace with hash 1295676796, now seen corresponding path program 3 times [2021-12-18 19:25:51,661 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:25:51,661 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [679775040] [2021-12-18 19:25:51,661 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-18 19:25:51,661 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:25:51,661 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:25:51,669 INFO L229 MonitoredProcess]: Starting monitored process 40 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 19:25:51,671 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-12-18 19:25:52,035 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-12-18 19:25:52,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:25:52,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 25 conjunts are in the unsatisfiable core [2021-12-18 19:25:52,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:25:52,071 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 19:25:52,091 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 19:25:56,495 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:25:56,528 INFO L354 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-12-18 19:25:56,528 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 2 case distinctions, treesize of input 15 treesize of output 23 [2021-12-18 19:25:56,548 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 19:25:56,548 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 19:25:56,662 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-12-18 19:25:56,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:25:59,620 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:25:59,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [679775040] [2021-12-18 19:25:59,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [679775040] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:25:59,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1165458264] [2021-12-18 19:25:59,621 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-18 19:25:59,621 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 19:25:59,621 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 19:25:59,627 INFO L229 MonitoredProcess]: Starting monitored process 41 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 19:25:59,629 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (41)] Waiting until timeout for monitored process [2021-12-18 19:26:00,080 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-12-18 19:26:00,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:26:00,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 35 conjunts are in the unsatisfiable core [2021-12-18 19:26:00,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:26:00,120 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 19:26:00,130 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 19:26:15,071 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:26:15,072 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:26:15,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:26:15,075 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 15 treesize of output 19 [2021-12-18 19:26:15,102 INFO L354 Elim1Store]: treesize reduction 16, result has 36.0 percent of original size [2021-12-18 19:26:15,102 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 25 [2021-12-18 19:26:15,218 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 36 proven. 48 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-12-18 19:26:15,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:26:24,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1165458264] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:26:24,057 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:26:24,057 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 13] total 16 [2021-12-18 19:26:24,057 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1554467591] [2021-12-18 19:26:24,057 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:26:24,058 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-18 19:26:24,058 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:26:24,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-18 19:26:24,058 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=389, Unknown=10, NotChecked=0, Total=462 [2021-12-18 19:26:24,058 INFO L87 Difference]: Start difference. First operand 356 states and 564 transitions. Second operand has 17 states, 16 states have (on average 2.875) internal successors, (46), 14 states have internal predecessors, (46), 9 states have call successors, (12), 3 states have call predecessors, (12), 5 states have return successors, (11), 7 states have call predecessors, (11), 8 states have call successors, (11) [2021-12-18 19:26:51,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:26:51,753 INFO L93 Difference]: Finished difference Result 383 states and 613 transitions. [2021-12-18 19:26:51,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-12-18 19:26:51,754 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.875) internal successors, (46), 14 states have internal predecessors, (46), 9 states have call successors, (12), 3 states have call predecessors, (12), 5 states have return successors, (11), 7 states have call predecessors, (11), 8 states have call successors, (11) Word has length 53 [2021-12-18 19:26:51,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:26:51,755 INFO L225 Difference]: With dead ends: 383 [2021-12-18 19:26:51,755 INFO L226 Difference]: Without dead ends: 383 [2021-12-18 19:26:51,756 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 101 SyntacticMatches, 4 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 56.9s TimeCoverageRelationStatistics Valid=111, Invalid=681, Unknown=20, NotChecked=0, Total=812 [2021-12-18 19:26:51,756 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 87 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 628 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 517 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 19:26:51,756 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 212 Invalid, 628 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 90 Invalid, 0 Unknown, 517 Unchecked, 0.1s Time] [2021-12-18 19:26:51,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383 states. [2021-12-18 19:26:51,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383 to 378. [2021-12-18 19:26:51,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 378 states, 260 states have (on average 1.1846153846153846) internal successors, (308), 288 states have internal predecessors, (308), 53 states have call successors, (53), 25 states have call predecessors, (53), 49 states have return successors, (246), 64 states have call predecessors, (246), 53 states have call successors, (246) [2021-12-18 19:26:51,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 607 transitions. [2021-12-18 19:26:51,772 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 607 transitions. Word has length 53 [2021-12-18 19:26:51,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:26:51,772 INFO L470 AbstractCegarLoop]: Abstraction has 378 states and 607 transitions. [2021-12-18 19:26:51,773 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.875) internal successors, (46), 14 states have internal predecessors, (46), 9 states have call successors, (12), 3 states have call predecessors, (12), 5 states have return successors, (11), 7 states have call predecessors, (11), 8 states have call successors, (11) [2021-12-18 19:26:51,773 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 607 transitions. [2021-12-18 19:26:51,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-18 19:26:51,774 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:26:51,774 INFO L514 BasicCegarLoop]: trace histogram [5, 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 19:26:51,781 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (41)] Forceful destruction successful, exit code 0 [2021-12-18 19:26:51,990 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (40)] Forceful destruction successful, exit code 0 [2021-12-18 19:26:52,180 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,40 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 19:26:52,180 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting maxErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:26:52,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:26:52,181 INFO L85 PathProgramCache]: Analyzing trace with hash -407980419, now seen corresponding path program 2 times [2021-12-18 19:26:52,181 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:26:52,181 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [385721312] [2021-12-18 19:26:52,181 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-18 19:26:52,181 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:26:52,182 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:26:52,183 INFO L229 MonitoredProcess]: Starting monitored process 42 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 19:26:52,183 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-12-18 19:26:52,443 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-18 19:26:52,444 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:26:52,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 58 conjunts are in the unsatisfiable core [2021-12-18 19:26:52,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:26:52,467 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 19:26:52,558 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 19:26:52,568 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 19:26:52,798 WARN L860 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_2855 (Array (_ BitVec 32) (_ BitVec 32)))) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| nondet_tree_~n~0.base v_ArrVal_2855))) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)) (exists ((v_ArrVal_2854 (Array (_ BitVec 32) (_ BitVec 32)))) (= |c_#memory_$Pointer$.offset| (store |c_old(#memory_$Pointer$.offset)| nondet_tree_~n~0.base v_ArrVal_2854))))) is different from true [2021-12-18 19:26:52,833 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:26:52,834 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 19:26:52,839 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:26:52,839 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 19:26:52,848 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 19:26:52,848 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 19:26:52,891 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-12-18 19:26:52,892 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 23 treesize of output 22 [2021-12-18 19:26:52,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:26:52,901 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 23 treesize of output 22 [2021-12-18 19:26:53,136 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 19:26:53,140 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 19:26:53,278 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 6 proven. 23 refuted. 0 times theorem prover too weak. 3 trivial. 9 not checked. [2021-12-18 19:26:53,278 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:26:54,509 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:26:54,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [385721312] [2021-12-18 19:26:54,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [385721312] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:26:54,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2104645161] [2021-12-18 19:26:54,509 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-18 19:26:54,509 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 19:26:54,509 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 19:26:54,510 INFO L229 MonitoredProcess]: Starting monitored process 43 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 19:26:54,513 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (43)] Waiting until timeout for monitored process [2021-12-18 19:26:54,867 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-18 19:26:54,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:26:54,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 60 conjunts are in the unsatisfiable core [2021-12-18 19:26:54,881 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:26:54,890 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 19:26:55,043 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 19:26:55,049 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 19:26:55,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:26:55,392 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 19:26:55,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:26:55,399 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 19:26:55,407 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 19:26:55,407 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 19:26:55,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:26:55,497 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 23 treesize of output 22 [2021-12-18 19:26:55,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:26:55,506 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 23 treesize of output 22 [2021-12-18 19:26:55,837 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 19:26:55,840 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 19:26:55,866 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 6 proven. 31 refuted. 1 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-18 19:26:55,866 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:26:57,031 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_nondet_tree_~n~0.base_264 (_ BitVec 32))) (or (and (forall ((v_ArrVal_3010 (Array (_ BitVec 32) (_ BitVec 32)))) (= (select (select (store |c_#memory_$Pointer$.offset| v_nondet_tree_~n~0.base_264 v_ArrVal_3010) c_nondet_tree_~n~0.base) (bvadd c_nondet_tree_~n~0.offset (_ bv4 32))) (_ bv0 32))) (forall ((v_ArrVal_3009 (Array (_ BitVec 32) (_ BitVec 32)))) (= (select (select (store |c_#memory_$Pointer$.base| v_nondet_tree_~n~0.base_264 v_ArrVal_3009) c_nondet_tree_~n~0.base) (bvadd c_nondet_tree_~n~0.offset (_ bv4 32))) (_ bv0 32)))) (not (= (_ bv0 1) (select |c_#valid| v_nondet_tree_~n~0.base_264))))) is different from false [2021-12-18 19:26:57,033 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2104645161] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:26:57,033 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:26:57,033 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 31 [2021-12-18 19:26:57,034 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [874961890] [2021-12-18 19:26:57,034 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:26:57,034 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-12-18 19:26:57,034 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:26:57,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-12-18 19:26:57,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=830, Unknown=19, NotChecked=118, Total=1056 [2021-12-18 19:26:57,034 INFO L87 Difference]: Start difference. First operand 378 states and 607 transitions. Second operand has 31 states, 28 states have (on average 1.7142857142857142) internal successors, (48), 22 states have internal predecessors, (48), 9 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) [2021-12-18 19:26:59,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:26:59,126 INFO L93 Difference]: Finished difference Result 437 states and 703 transitions. [2021-12-18 19:26:59,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-12-18 19:26:59,140 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 28 states have (on average 1.7142857142857142) internal successors, (48), 22 states have internal predecessors, (48), 9 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) Word has length 45 [2021-12-18 19:26:59,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:26:59,142 INFO L225 Difference]: With dead ends: 437 [2021-12-18 19:26:59,142 INFO L226 Difference]: Without dead ends: 437 [2021-12-18 19:26:59,142 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 87 SyntacticMatches, 8 SemanticMatches, 44 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 486 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=195, Invalid=1680, Unknown=25, NotChecked=170, Total=2070 [2021-12-18 19:26:59,143 INFO L933 BasicCegarLoop]: 83 mSDtfsCounter, 102 mSDsluCounter, 464 mSDsCounter, 0 mSdLazyCounter, 1470 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 547 SdHoareTripleChecker+Invalid, 1776 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 1470 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 272 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-12-18 19:26:59,143 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 547 Invalid, 1776 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 1470 Invalid, 0 Unknown, 272 Unchecked, 1.6s Time] [2021-12-18 19:26:59,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 437 states. [2021-12-18 19:26:59,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 437 to 431. [2021-12-18 19:26:59,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 431 states, 298 states have (on average 1.1711409395973154) internal successors, (349), 329 states have internal predecessors, (349), 62 states have call successors, (62), 28 states have call predecessors, (62), 55 states have return successors, (286), 73 states have call predecessors, (286), 62 states have call successors, (286) [2021-12-18 19:26:59,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 431 states to 431 states and 697 transitions. [2021-12-18 19:26:59,174 INFO L78 Accepts]: Start accepts. Automaton has 431 states and 697 transitions. Word has length 45 [2021-12-18 19:26:59,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:26:59,174 INFO L470 AbstractCegarLoop]: Abstraction has 431 states and 697 transitions. [2021-12-18 19:26:59,174 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 28 states have (on average 1.7142857142857142) internal successors, (48), 22 states have internal predecessors, (48), 9 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) [2021-12-18 19:26:59,174 INFO L276 IsEmpty]: Start isEmpty. Operand 431 states and 697 transitions. [2021-12-18 19:26:59,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-12-18 19:26:59,175 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:26:59,175 INFO L514 BasicCegarLoop]: trace histogram [8, 6, 5, 5, 5, 5, 5, 5, 5, 5, 3, 2, 2, 1, 1, 1, 1] [2021-12-18 19:26:59,187 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (43)] Forceful destruction successful, exit code 0 [2021-12-18 19:26:59,396 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (42)] Forceful destruction successful, exit code 0 [2021-12-18 19:26:59,580 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,42 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 19:26:59,580 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting nondet_treeErr5REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:26:59,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:26:59,580 INFO L85 PathProgramCache]: Analyzing trace with hash -880124584, now seen corresponding path program 4 times [2021-12-18 19:26:59,580 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:26:59,581 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [409695224] [2021-12-18 19:26:59,581 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-18 19:26:59,581 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:26:59,581 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:26:59,588 INFO L229 MonitoredProcess]: Starting monitored process 44 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 19:26:59,590 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (44)] Waiting until timeout for monitored process [2021-12-18 19:26:59,983 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-18 19:26:59,983 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:27:00,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 439 conjuncts, 26 conjunts are in the unsatisfiable core [2021-12-18 19:27:00,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:27:00,053 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 19:27:00,057 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 19:27:06,432 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:27:06,462 INFO L354 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-12-18 19:27:06,462 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 2 case distinctions, treesize of input 15 treesize of output 23 [2021-12-18 19:27:06,475 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 19:27:06,476 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 19:27:06,543 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 90 proven. 54 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-12-18 19:27:06,543 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:27:08,734 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:27:08,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [409695224] [2021-12-18 19:27:08,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [409695224] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:27:08,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [54014854] [2021-12-18 19:27:08,735 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-18 19:27:08,735 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 19:27:08,735 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 19:27:08,736 INFO L229 MonitoredProcess]: Starting monitored process 45 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 19:27:08,737 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (45)] Waiting until timeout for monitored process [2021-12-18 19:27:09,242 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-18 19:27:09,242 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:27:09,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 439 conjuncts, 26 conjunts are in the unsatisfiable core [2021-12-18 19:27:09,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:27:09,306 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 19:27:09,314 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 19:27:15,670 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:27:15,695 INFO L354 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-12-18 19:27:15,695 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 2 case distinctions, treesize of input 15 treesize of output 23 [2021-12-18 19:27:15,706 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 19:27:15,707 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 19:27:15,719 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 90 proven. 54 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-12-18 19:27:15,720 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:27:18,614 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [54014854] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:27:18,614 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:27:18,614 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2021-12-18 19:27:18,614 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434166844] [2021-12-18 19:27:18,614 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:27:18,614 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-18 19:27:18,614 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:27:18,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-18 19:27:18,615 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=84, Unknown=2, NotChecked=0, Total=110 [2021-12-18 19:27:18,615 INFO L87 Difference]: Start difference. First operand 431 states and 697 transitions. Second operand has 9 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 4 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-18 19:27:20,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:27:20,901 INFO L93 Difference]: Finished difference Result 436 states and 703 transitions. [2021-12-18 19:27:20,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-18 19:27:20,902 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 4 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) Word has length 65 [2021-12-18 19:27:20,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:27:20,904 INFO L225 Difference]: With dead ends: 436 [2021-12-18 19:27:20,904 INFO L226 Difference]: Without dead ends: 436 [2021-12-18 19:27:20,905 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 119 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 19.0s TimeCoverageRelationStatistics Valid=32, Invalid=97, Unknown=3, NotChecked=0, Total=132 [2021-12-18 19:27:20,905 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 42 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 325 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 221 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 19:27:20,905 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 126 Invalid, 325 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 95 Invalid, 0 Unknown, 221 Unchecked, 0.2s Time] [2021-12-18 19:27:20,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 436 states. [2021-12-18 19:27:20,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 436 to 431. [2021-12-18 19:27:20,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 431 states, 298 states have (on average 1.1711409395973154) internal successors, (349), 329 states have internal predecessors, (349), 62 states have call successors, (62), 28 states have call predecessors, (62), 55 states have return successors, (286), 73 states have call predecessors, (286), 62 states have call successors, (286) [2021-12-18 19:27:20,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 431 states to 431 states and 697 transitions. [2021-12-18 19:27:20,919 INFO L78 Accepts]: Start accepts. Automaton has 431 states and 697 transitions. Word has length 65 [2021-12-18 19:27:20,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:27:20,919 INFO L470 AbstractCegarLoop]: Abstraction has 431 states and 697 transitions. [2021-12-18 19:27:20,919 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 4 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-18 19:27:20,919 INFO L276 IsEmpty]: Start isEmpty. Operand 431 states and 697 transitions. [2021-12-18 19:27:20,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-18 19:27:20,920 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:27:20,920 INFO L514 BasicCegarLoop]: trace histogram [5, 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 19:27:20,931 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (45)] Forceful destruction successful, exit code 0 [2021-12-18 19:27:21,143 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (44)] Forceful destruction successful, exit code 0 [2021-12-18 19:27:21,331 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,44 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 19:27:21,332 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting maxErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:27:21,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:27:21,332 INFO L85 PathProgramCache]: Analyzing trace with hash -1293875203, now seen corresponding path program 3 times [2021-12-18 19:27:21,332 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:27:21,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [507660282] [2021-12-18 19:27:21,332 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-18 19:27:21,332 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:27:21,332 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:27:21,333 INFO L229 MonitoredProcess]: Starting monitored process 46 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 19:27:21,336 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (46)] Waiting until timeout for monitored process [2021-12-18 19:27:21,621 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-12-18 19:27:21,621 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:27:21,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 32 conjunts are in the unsatisfiable core [2021-12-18 19:27:21,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:27:21,721 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 19:27:21,798 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-12-18 19:27:21,799 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 27 treesize of output 26 [2021-12-18 19:27:21,968 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 23 treesize of output 11 [2021-12-18 19:27:22,055 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 14 proven. 22 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-18 19:27:22,055 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:27:22,594 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 8 proven. 28 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-18 19:27:22,595 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:27:22,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [507660282] [2021-12-18 19:27:22,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [507660282] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 19:27:22,595 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:27:22,595 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 17 [2021-12-18 19:27:22,595 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1580518736] [2021-12-18 19:27:22,595 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:27:22,596 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-18 19:27:22,596 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:27:22,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-18 19:27:22,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=269, Unknown=0, NotChecked=0, Total=306 [2021-12-18 19:27:22,596 INFO L87 Difference]: Start difference. First operand 431 states and 697 transitions. Second operand has 18 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 5 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2021-12-18 19:27:24,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:27:24,158 INFO L93 Difference]: Finished difference Result 457 states and 727 transitions. [2021-12-18 19:27:24,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-12-18 19:27:24,159 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 5 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) Word has length 45 [2021-12-18 19:27:24,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:27:24,162 INFO L225 Difference]: With dead ends: 457 [2021-12-18 19:27:24,162 INFO L226 Difference]: Without dead ends: 457 [2021-12-18 19:27:24,163 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 70 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=85, Invalid=617, Unknown=0, NotChecked=0, Total=702 [2021-12-18 19:27:24,163 INFO L933 BasicCegarLoop]: 109 mSDtfsCounter, 69 mSDsluCounter, 760 mSDsCounter, 0 mSdLazyCounter, 900 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 869 SdHoareTripleChecker+Invalid, 1157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 900 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 238 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-12-18 19:27:24,163 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 869 Invalid, 1157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 900 Invalid, 0 Unknown, 238 Unchecked, 1.3s Time] [2021-12-18 19:27:24,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 457 states. [2021-12-18 19:27:24,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 457 to 445. [2021-12-18 19:27:24,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 445 states, 309 states have (on average 1.1844660194174756) internal successors, (366), 340 states have internal predecessors, (366), 64 states have call successors, (64), 29 states have call predecessors, (64), 56 states have return successors, (289), 75 states have call predecessors, (289), 64 states have call successors, (289) [2021-12-18 19:27:24,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 719 transitions. [2021-12-18 19:27:24,184 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 719 transitions. Word has length 45 [2021-12-18 19:27:24,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:27:24,186 INFO L470 AbstractCegarLoop]: Abstraction has 445 states and 719 transitions. [2021-12-18 19:27:24,186 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 5 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2021-12-18 19:27:24,186 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 719 transitions. [2021-12-18 19:27:24,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-18 19:27:24,187 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:27:24,187 INFO L514 BasicCegarLoop]: trace histogram [5, 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 19:27:24,196 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (46)] Forceful destruction successful, exit code 0 [2021-12-18 19:27:24,395 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 19:27:24,396 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting maxErr1REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:27:24,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:27:24,396 INFO L85 PathProgramCache]: Analyzing trace with hash -1293875202, now seen corresponding path program 1 times [2021-12-18 19:27:24,396 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:27:24,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1682319856] [2021-12-18 19:27:24,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 19:27:24,396 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:27:24,396 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:27:24,397 INFO L229 MonitoredProcess]: Starting monitored process 47 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 19:27:24,399 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2021-12-18 19:27:24,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 19:27:24,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 46 conjunts are in the unsatisfiable core [2021-12-18 19:27:24,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:27:24,682 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 19:27:24,803 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 19:27:24,810 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 19:27:24,910 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-12-18 19:27:24,911 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 23 treesize of output 22 [2021-12-18 19:27:24,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:27:24,919 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 25 treesize of output 24 [2021-12-18 19:27:25,126 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 19:27:25,129 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 21 treesize of output 9 [2021-12-18 19:27:25,226 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-18 19:27:25,227 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:27:32,393 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 9 proven. 28 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-18 19:27:32,393 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:27:32,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1682319856] [2021-12-18 19:27:32,393 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1682319856] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 19:27:32,393 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:27:32,393 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 29 [2021-12-18 19:27:32,394 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933115266] [2021-12-18 19:27:32,394 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:27:32,394 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-12-18 19:27:32,394 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:27:32,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-12-18 19:27:32,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=795, Unknown=2, NotChecked=0, Total=870 [2021-12-18 19:27:32,394 INFO L87 Difference]: Start difference. First operand 445 states and 719 transitions. Second operand has 30 states, 25 states have (on average 2.28) internal successors, (57), 22 states have internal predecessors, (57), 9 states have call successors, (12), 9 states have call predecessors, (12), 8 states have return successors, (10), 8 states have call predecessors, (10), 5 states have call successors, (10) [2021-12-18 19:27:38,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:27:38,116 INFO L93 Difference]: Finished difference Result 486 states and 771 transitions. [2021-12-18 19:27:38,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-18 19:27:38,117 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 25 states have (on average 2.28) internal successors, (57), 22 states have internal predecessors, (57), 9 states have call successors, (12), 9 states have call predecessors, (12), 8 states have return successors, (10), 8 states have call predecessors, (10), 5 states have call successors, (10) Word has length 45 [2021-12-18 19:27:38,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:27:38,119 INFO L225 Difference]: With dead ends: 486 [2021-12-18 19:27:38,119 INFO L226 Difference]: Without dead ends: 486 [2021-12-18 19:27:38,120 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 58 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 185 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=174, Invalid=1464, Unknown=2, NotChecked=0, Total=1640 [2021-12-18 19:27:38,120 INFO L933 BasicCegarLoop]: 94 mSDtfsCounter, 191 mSDsluCounter, 330 mSDsCounter, 0 mSdLazyCounter, 1920 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 193 SdHoareTripleChecker+Valid, 424 SdHoareTripleChecker+Invalid, 2038 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 1920 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 54 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2021-12-18 19:27:38,120 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [193 Valid, 424 Invalid, 2038 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 1920 Invalid, 0 Unknown, 54 Unchecked, 4.8s Time] [2021-12-18 19:27:38,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 486 states. [2021-12-18 19:27:38,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 486 to 475. [2021-12-18 19:27:38,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 475 states, 332 states have (on average 1.1867469879518073) internal successors, (394), 363 states have internal predecessors, (394), 69 states have call successors, (69), 31 states have call predecessors, (69), 58 states have return successors, (296), 80 states have call predecessors, (296), 69 states have call successors, (296) [2021-12-18 19:27:38,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 475 states to 475 states and 759 transitions. [2021-12-18 19:27:38,136 INFO L78 Accepts]: Start accepts. Automaton has 475 states and 759 transitions. Word has length 45 [2021-12-18 19:27:38,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:27:38,136 INFO L470 AbstractCegarLoop]: Abstraction has 475 states and 759 transitions. [2021-12-18 19:27:38,136 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 25 states have (on average 2.28) internal successors, (57), 22 states have internal predecessors, (57), 9 states have call successors, (12), 9 states have call predecessors, (12), 8 states have return successors, (10), 8 states have call predecessors, (10), 5 states have call successors, (10) [2021-12-18 19:27:38,136 INFO L276 IsEmpty]: Start isEmpty. Operand 475 states and 759 transitions. [2021-12-18 19:27:38,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-12-18 19:27:38,138 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:27:38,138 INFO L514 BasicCegarLoop]: trace histogram [10, 7, 6, 6, 6, 6, 6, 6, 6, 6, 4, 3, 3, 1, 1, 1, 1] [2021-12-18 19:27:38,149 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (47)] Forceful destruction successful, exit code 0 [2021-12-18 19:27:38,346 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 19:27:38,346 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting nondet_treeErr4REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:27:38,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:27:38,347 INFO L85 PathProgramCache]: Analyzing trace with hash -1617216693, now seen corresponding path program 4 times [2021-12-18 19:27:38,347 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:27:38,347 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [549462397] [2021-12-18 19:27:38,347 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-18 19:27:38,347 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:27:38,347 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:27:38,348 INFO L229 MonitoredProcess]: Starting monitored process 48 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 19:27:38,350 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-12-18 19:27:38,744 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-18 19:27:38,744 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:27:38,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 531 conjuncts, 25 conjunts are in the unsatisfiable core [2021-12-18 19:27:38,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:27:38,788 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 19:27:53,143 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 19:27:53,196 INFO L354 Elim1Store]: treesize reduction 67, result has 37.4 percent of original size [2021-12-18 19:27:53,197 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 5 case distinctions, treesize of input 26 treesize of output 54 [2021-12-18 19:27:53,249 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 120 proven. 78 refuted. 3 times theorem prover too weak. 66 trivial. 0 not checked. [2021-12-18 19:27:53,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:27:53,690 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:27:53,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [549462397] [2021-12-18 19:27:53,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [549462397] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:27:53,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [355355073] [2021-12-18 19:27:53,691 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-18 19:27:53,691 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 19:27:53,691 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 19:27:53,692 INFO L229 MonitoredProcess]: Starting monitored process 49 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 19:27:53,706 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (49)] Waiting until timeout for monitored process [2021-12-18 19:27:54,410 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-18 19:27:54,410 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:27:54,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 531 conjuncts, 26 conjunts are in the unsatisfiable core [2021-12-18 19:27:54,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:27:54,459 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 19:28:29,239 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 19:28:29,299 INFO L354 Elim1Store]: treesize reduction 60, result has 43.9 percent of original size [2021-12-18 19:28:29,299 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 5 case distinctions, treesize of input 39 treesize of output 74 [2021-12-18 19:28:29,350 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 120 proven. 78 refuted. 3 times theorem prover too weak. 66 trivial. 0 not checked. [2021-12-18 19:28:29,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:28:29,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [355355073] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:28:29,595 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:28:29,595 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2021-12-18 19:28:29,595 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032067096] [2021-12-18 19:28:29,595 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:28:29,595 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-18 19:28:29,595 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:28:29,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-18 19:28:29,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=130, Unknown=15, NotChecked=0, Total=182 [2021-12-18 19:28:29,596 INFO L87 Difference]: Start difference. First operand 475 states and 759 transitions. Second operand has 13 states, 12 states have (on average 4.25) internal successors, (51), 11 states have internal predecessors, (51), 9 states have call successors, (13), 2 states have call predecessors, (13), 7 states have return successors, (14), 9 states have call predecessors, (14), 9 states have call successors, (14) [2021-12-18 19:29:09,448 WARN L860 $PredicateComparison]: unable to prove that (and (exists ((v_nondet_tree_~n~0.base_308 (_ BitVec 32)) (v_ArrVal_3588 (_ BitVec 1)) (v_ArrVal_3589 (_ BitVec 1))) (and (= (_ bv0 1) (bvadd (bvneg v_ArrVal_3589) (_ bv1 1))) (= |c_#valid| (store (store |c_old(#valid)| c_nondet_tree_~n~0.base v_ArrVal_3588) v_nondet_tree_~n~0.base_308 v_ArrVal_3589)))) (exists ((v_nondet_tree_~n~0.base_308 (_ BitVec 32)) (v_nondet_tree_~n~0.base_309 (_ BitVec 32)) (v_ArrVal_3588 (_ BitVec 1)) (v_ArrVal_3589 (_ BitVec 1)) (nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_3587 (_ BitVec 1))) (and (= (_ bv0 1) (bvadd (select |c_#valid| v_nondet_tree_~n~0.base_309) (_ bv1 1))) (= (_ bv0 1) (bvadd (bvneg v_ArrVal_3589) (_ bv1 1))) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)) (= |c_#valid| (store (store (store |c_old(#valid)| nondet_tree_~n~0.base v_ArrVal_3587) v_nondet_tree_~n~0.base_309 v_ArrVal_3588) v_nondet_tree_~n~0.base_308 v_ArrVal_3589)))) (exists ((v_ArrVal_3589 (_ BitVec 1)) (nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_3587 (_ BitVec 1)) (v_nondet_tree_~n~0.base_329 (_ BitVec 32))) (and (= (_ bv0 1) (bvadd (bvneg v_ArrVal_3589) (_ bv1 1))) (= |c_#valid| (store (store |c_old(#valid)| nondet_tree_~n~0.base v_ArrVal_3587) v_nondet_tree_~n~0.base_329 v_ArrVal_3589)) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base))))) is different from true [2021-12-18 19:29:28,705 WARN L227 SmtUtils]: Spent 5.07s on a formula simplification. DAG size of input: 43 DAG size of output: 23 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-18 19:30:15,825 WARN L227 SmtUtils]: Spent 5.12s on a formula simplification. DAG size of input: 43 DAG size of output: 39 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-18 19:30:49,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:30:49,402 INFO L93 Difference]: Finished difference Result 490 states and 825 transitions. [2021-12-18 19:30:49,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-18 19:30:49,409 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 4.25) internal successors, (51), 11 states have internal predecessors, (51), 9 states have call successors, (13), 2 states have call predecessors, (13), 7 states have return successors, (14), 9 states have call predecessors, (14), 9 states have call successors, (14) Word has length 79 [2021-12-18 19:30:49,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:30:49,411 INFO L225 Difference]: With dead ends: 490 [2021-12-18 19:30:49,411 INFO L226 Difference]: Without dead ends: 490 [2021-12-18 19:30:49,411 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 151 SyntacticMatches, 13 SemanticMatches, 25 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 187.5s TimeCoverageRelationStatistics Valid=165, Invalid=420, Unknown=69, NotChecked=48, Total=702 [2021-12-18 19:30:49,411 INFO L933 BasicCegarLoop]: 87 mSDtfsCounter, 22 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 256 SdHoareTripleChecker+Invalid, 532 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 499 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 19:30:49,412 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 256 Invalid, 532 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 30 Invalid, 0 Unknown, 499 Unchecked, 0.1s Time] [2021-12-18 19:30:49,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2021-12-18 19:30:49,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 482. [2021-12-18 19:30:49,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 482 states, 337 states have (on average 1.1839762611275964) internal successors, (399), 368 states have internal predecessors, (399), 70 states have call successors, (70), 31 states have call predecessors, (70), 59 states have return successors, (345), 82 states have call predecessors, (345), 70 states have call successors, (345) [2021-12-18 19:30:49,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 482 states to 482 states and 814 transitions. [2021-12-18 19:30:49,428 INFO L78 Accepts]: Start accepts. Automaton has 482 states and 814 transitions. Word has length 79 [2021-12-18 19:30:49,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:30:49,428 INFO L470 AbstractCegarLoop]: Abstraction has 482 states and 814 transitions. [2021-12-18 19:30:49,428 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 4.25) internal successors, (51), 11 states have internal predecessors, (51), 9 states have call successors, (13), 2 states have call predecessors, (13), 7 states have return successors, (14), 9 states have call predecessors, (14), 9 states have call successors, (14) [2021-12-18 19:30:49,428 INFO L276 IsEmpty]: Start isEmpty. Operand 482 states and 814 transitions. [2021-12-18 19:30:49,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-12-18 19:30:49,430 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:30:49,430 INFO L514 BasicCegarLoop]: trace histogram [9, 7, 7, 7, 7, 6, 6, 5, 5, 5, 3, 3, 3, 1, 1, 1, 1] [2021-12-18 19:30:49,453 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (49)] Forceful destruction successful, exit code 0 [2021-12-18 19:30:49,641 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (48)] Forceful destruction successful, exit code 0 [2021-12-18 19:30:49,831 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,48 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 19:30:49,831 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:30:49,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:30:49,832 INFO L85 PathProgramCache]: Analyzing trace with hash 112274014, now seen corresponding path program 4 times [2021-12-18 19:30:49,832 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:30:49,832 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [878426451] [2021-12-18 19:30:49,832 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-18 19:30:49,832 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:30:49,832 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:30:49,833 INFO L229 MonitoredProcess]: Starting monitored process 50 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 19:30:49,834 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (50)] Waiting until timeout for monitored process [2021-12-18 19:30:50,329 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-18 19:30:50,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:30:50,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 543 conjuncts, 23 conjunts are in the unsatisfiable core [2021-12-18 19:30:50,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:30:50,388 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 19:31:04,192 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 19:31:04,251 INFO L354 Elim1Store]: treesize reduction 67, result has 37.4 percent of original size [2021-12-18 19:31:04,251 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 5 case distinctions, treesize of input 26 treesize of output 54 [2021-12-18 19:31:04,277 INFO L134 CoverageAnalysis]: Checked inductivity of 254 backedges. 126 proven. 63 refuted. 3 times theorem prover too weak. 62 trivial. 0 not checked. [2021-12-18 19:31:04,277 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:31:04,520 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:31:04,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [878426451] [2021-12-18 19:31:04,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [878426451] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:31:04,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1292074406] [2021-12-18 19:31:04,521 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-18 19:31:04,521 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 19:31:04,521 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 19:31:04,522 INFO L229 MonitoredProcess]: Starting monitored process 51 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 19:31:04,522 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (51)] Waiting until timeout for monitored process [2021-12-18 19:31:05,299 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-18 19:31:05,299 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:31:05,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 543 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-18 19:31:05,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:31:05,370 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 19:31:47,867 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 19:31:47,932 INFO L354 Elim1Store]: treesize reduction 60, result has 43.9 percent of original size [2021-12-18 19:31:47,932 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 5 case distinctions, treesize of input 39 treesize of output 74 [2021-12-18 19:31:47,976 INFO L134 CoverageAnalysis]: Checked inductivity of 254 backedges. 126 proven. 63 refuted. 3 times theorem prover too weak. 62 trivial. 0 not checked. [2021-12-18 19:31:47,976 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:31:48,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1292074406] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:31:48,263 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:31:48,263 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2021-12-18 19:31:48,263 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511422712] [2021-12-18 19:31:48,263 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:31:48,263 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-18 19:31:48,263 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:31:48,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-18 19:31:48,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=130, Unknown=16, NotChecked=0, Total=182 [2021-12-18 19:31:48,264 INFO L87 Difference]: Start difference. First operand 482 states and 814 transitions. Second operand has 13 states, 12 states have (on average 4.083333333333333) internal successors, (49), 11 states have internal predecessors, (49), 9 states have call successors, (12), 2 states have call predecessors, (12), 7 states have return successors, (13), 9 states have call predecessors, (13), 9 states have call successors, (13) [2021-12-18 19:32:02,707 WARN L227 SmtUtils]: Spent 5.82s on a formula simplification. DAG size of input: 60 DAG size of output: 22 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-18 19:32:32,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:32:32,172 INFO L93 Difference]: Finished difference Result 492 states and 826 transitions. [2021-12-18 19:32:32,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-18 19:32:32,182 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 4.083333333333333) internal successors, (49), 11 states have internal predecessors, (49), 9 states have call successors, (12), 2 states have call predecessors, (12), 7 states have return successors, (13), 9 states have call predecessors, (13), 9 states have call successors, (13) Word has length 77 [2021-12-18 19:32:32,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:32:32,184 INFO L225 Difference]: With dead ends: 492 [2021-12-18 19:32:32,184 INFO L226 Difference]: Without dead ends: 492 [2021-12-18 19:32:32,184 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 143 SyntacticMatches, 13 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 98.5s TimeCoverageRelationStatistics Valid=100, Invalid=253, Unknown=27, NotChecked=0, Total=380 [2021-12-18 19:32:32,185 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 51 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 179 SdHoareTripleChecker+Invalid, 519 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 426 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 19:32:32,186 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 179 Invalid, 519 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 85 Invalid, 0 Unknown, 426 Unchecked, 0.1s Time] [2021-12-18 19:32:32,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 492 states. [2021-12-18 19:32:32,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 492 to 487. [2021-12-18 19:32:32,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 487 states, 341 states have (on average 1.18475073313783) internal successors, (404), 371 states have internal predecessors, (404), 70 states have call successors, (70), 31 states have call predecessors, (70), 60 states have return successors, (346), 84 states have call predecessors, (346), 70 states have call successors, (346) [2021-12-18 19:32:32,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 820 transitions. [2021-12-18 19:32:32,203 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 820 transitions. Word has length 77 [2021-12-18 19:32:32,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:32:32,203 INFO L470 AbstractCegarLoop]: Abstraction has 487 states and 820 transitions. [2021-12-18 19:32:32,203 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 4.083333333333333) internal successors, (49), 11 states have internal predecessors, (49), 9 states have call successors, (12), 2 states have call predecessors, (12), 7 states have return successors, (13), 9 states have call predecessors, (13), 9 states have call successors, (13) [2021-12-18 19:32:32,203 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 820 transitions. [2021-12-18 19:32:32,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-12-18 19:32:32,205 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:32:32,205 INFO L514 BasicCegarLoop]: trace histogram [8, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1] [2021-12-18 19:32:32,215 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (51)] Forceful destruction successful, exit code 0 [2021-12-18 19:32:32,425 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (50)] Forceful destruction successful, exit code 0 [2021-12-18 19:32:32,623 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,50 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 19:32:32,623 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting nondet_treeErr5REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:32:32,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:32:32,623 INFO L85 PathProgramCache]: Analyzing trace with hash 1368352044, now seen corresponding path program 5 times [2021-12-18 19:32:32,624 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:32:32,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [384698136] [2021-12-18 19:32:32,624 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-18 19:32:32,624 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:32:32,624 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:32:32,625 INFO L229 MonitoredProcess]: Starting monitored process 52 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 19:32:32,625 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (52)] Waiting until timeout for monitored process [2021-12-18 19:32:33,320 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-12-18 19:32:33,321 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:32:33,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 37 conjunts are in the unsatisfiable core [2021-12-18 19:32:33,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:32:33,353 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 19:32:33,358 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 19:32:33,528 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 19:32:33,684 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 19:32:33,684 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 19:32:36,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:32:36,275 INFO L354 Elim1Store]: treesize reduction 53, result has 25.4 percent of original size [2021-12-18 19:32:36,275 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 2 case distinctions, treesize of input 18 treesize of output 31 [2021-12-18 19:32:36,294 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 19:32:36,294 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 19:32:36,406 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 32 proven. 100 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-12-18 19:32:36,406 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:32:36,671 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 10 treesize of output 8 [2021-12-18 19:32:43,307 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:32:43,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [384698136] [2021-12-18 19:32:43,308 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [384698136] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:32:43,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [79432690] [2021-12-18 19:32:43,308 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-18 19:32:43,308 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 19:32:43,308 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 19:32:43,309 INFO L229 MonitoredProcess]: Starting monitored process 53 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 19:32:43,310 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (53)] Waiting until timeout for monitored process [2021-12-18 19:32:43,841 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-18 19:32:43,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [617883983] [2021-12-18 19:32:43,841 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-18 19:32:43,841 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 19:32:43,841 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 19:32:43,849 INFO L229 MonitoredProcess]: Starting monitored process 54 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 19:32:43,852 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (53)] Forceful destruction successful, exit code 1 [2021-12-18 19:32:43,876 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-12-18 19:33:02,590 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-12-18 19:33:02,590 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:33:02,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 37 conjunts are in the unsatisfiable core [2021-12-18 19:33:02,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:33:02,620 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 19:33:41,555 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:33:41,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:33:41,558 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:33:41,559 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:33:41,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:33:41,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:33:41,563 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 24 [2021-12-18 19:33:41,600 INFO L354 Elim1Store]: treesize reduction 36, result has 26.5 percent of original size [2021-12-18 19:33:41,600 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 76 treesize of output 80 [2021-12-18 19:33:41,662 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 31 proven. 82 refuted. 8 times theorem prover too weak. 37 trivial. 0 not checked. [2021-12-18 19:33:41,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:33:45,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [617883983] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:33:45,338 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:33:45,338 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 14 [2021-12-18 19:33:45,338 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743014431] [2021-12-18 19:33:45,338 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:33:45,339 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-18 19:33:45,339 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:33:45,339 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-18 19:33:45,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=245, Unknown=18, NotChecked=0, Total=306 [2021-12-18 19:33:45,339 INFO L87 Difference]: Start difference. First operand 487 states and 820 transitions. Second operand has 15 states, 14 states have (on average 4.428571428571429) internal successors, (62), 14 states have internal predecessors, (62), 11 states have call successors, (15), 3 states have call predecessors, (15), 8 states have return successors, (16), 9 states have call predecessors, (16), 10 states have call successors, (16) [2021-12-18 19:34:06,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:34:06,167 INFO L93 Difference]: Finished difference Result 513 states and 866 transitions. [2021-12-18 19:34:06,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-18 19:34:06,188 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 4.428571428571429) internal successors, (62), 14 states have internal predecessors, (62), 11 states have call successors, (15), 3 states have call predecessors, (15), 8 states have return successors, (16), 9 states have call predecessors, (16), 10 states have call successors, (16) Word has length 63 [2021-12-18 19:34:06,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:34:06,190 INFO L225 Difference]: With dead ends: 513 [2021-12-18 19:34:06,190 INFO L226 Difference]: Without dead ends: 513 [2021-12-18 19:34:06,190 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 108 SyntacticMatches, 5 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 69.0s TimeCoverageRelationStatistics Valid=81, Invalid=397, Unknown=28, NotChecked=0, Total=506 [2021-12-18 19:34:06,190 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 82 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 793 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 625 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 19:34:06,190 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 233 Invalid, 793 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 146 Invalid, 0 Unknown, 625 Unchecked, 0.2s Time] [2021-12-18 19:34:06,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 513 states. [2021-12-18 19:34:06,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 513 to 508. [2021-12-18 19:34:06,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 508 states, 356 states have (on average 1.1769662921348314) internal successors, (419), 386 states have internal predecessors, (419), 73 states have call successors, (73), 31 states have call predecessors, (73), 63 states have return successors, (366), 90 states have call predecessors, (366), 73 states have call successors, (366) [2021-12-18 19:34:06,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 508 states to 508 states and 858 transitions. [2021-12-18 19:34:06,208 INFO L78 Accepts]: Start accepts. Automaton has 508 states and 858 transitions. Word has length 63 [2021-12-18 19:34:06,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:34:06,210 INFO L470 AbstractCegarLoop]: Abstraction has 508 states and 858 transitions. [2021-12-18 19:34:06,210 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 4.428571428571429) internal successors, (62), 14 states have internal predecessors, (62), 11 states have call successors, (15), 3 states have call predecessors, (15), 8 states have return successors, (16), 9 states have call predecessors, (16), 10 states have call successors, (16) [2021-12-18 19:34:06,210 INFO L276 IsEmpty]: Start isEmpty. Operand 508 states and 858 transitions. [2021-12-18 19:34:06,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-12-18 19:34:06,211 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:34:06,211 INFO L514 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1] [2021-12-18 19:34:06,240 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (52)] Forceful destruction successful, exit code 0 [2021-12-18 19:34:06,452 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2021-12-18 19:34:06,631 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,54 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 19:34:06,631 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting nondet_treeErr3REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:34:06,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:34:06,632 INFO L85 PathProgramCache]: Analyzing trace with hash -1818958153, now seen corresponding path program 4 times [2021-12-18 19:34:06,632 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:34:06,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [106414118] [2021-12-18 19:34:06,632 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-18 19:34:06,632 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:34:06,632 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:34:06,647 INFO L229 MonitoredProcess]: Starting monitored process 55 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 19:34:06,648 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (55)] Waiting until timeout for monitored process [2021-12-18 19:34:06,984 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-18 19:34:06,984 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:34:06,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 28 conjunts are in the unsatisfiable core [2021-12-18 19:34:06,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:34:07,004 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 19:34:07,008 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 19:34:11,486 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:34:11,532 INFO L354 Elim1Store]: treesize reduction 67, result has 25.6 percent of original size [2021-12-18 19:34:11,533 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 3 case distinctions, treesize of input 18 treesize of output 31 [2021-12-18 19:34:11,544 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 19:34:11,544 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 19:34:11,621 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 7 proven. 69 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-12-18 19:34:11,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:34:19,954 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:34:19,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [106414118] [2021-12-18 19:34:19,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [106414118] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:34:19,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1148540069] [2021-12-18 19:34:19,954 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-18 19:34:19,954 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 19:34:19,955 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 19:34:19,956 INFO L229 MonitoredProcess]: Starting monitored process 56 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 19:34:19,975 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (56)] Waiting until timeout for monitored process [2021-12-18 19:34:20,520 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-18 19:34:20,520 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:34:20,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 31 conjunts are in the unsatisfiable core [2021-12-18 19:34:20,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:34:20,545 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 19:34:20,551 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 19:34:32,161 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:34:32,162 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 19:34:32,237 INFO L354 Elim1Store]: treesize reduction 47, result has 36.5 percent of original size [2021-12-18 19:34:32,238 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 3 case distinctions, treesize of input 18 treesize of output 35 [2021-12-18 19:34:32,292 INFO L354 Elim1Store]: treesize reduction 10, result has 60.0 percent of original size [2021-12-18 19:34:32,292 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 32 treesize of output 40 [2021-12-18 19:34:32,413 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 7 proven. 76 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-12-18 19:34:32,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:34:43,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1148540069] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 19:34:43,183 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:34:43,183 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 12 [2021-12-18 19:34:43,184 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [862166325] [2021-12-18 19:34:43,184 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:34:43,184 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-18 19:34:43,184 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:34:43,184 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-18 19:34:43,184 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=165, Unknown=10, NotChecked=0, Total=210 [2021-12-18 19:34:43,184 INFO L87 Difference]: Start difference. First operand 508 states and 858 transitions. Second operand has 13 states, 12 states have (on average 3.5) internal successors, (42), 11 states have internal predecessors, (42), 9 states have call successors, (10), 3 states have call predecessors, (10), 6 states have return successors, (12), 6 states have call predecessors, (12), 8 states have call successors, (12) [2021-12-18 19:35:13,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:35:13,277 INFO L93 Difference]: Finished difference Result 526 states and 890 transitions. [2021-12-18 19:35:13,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-18 19:35:13,290 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 3.5) internal successors, (42), 11 states have internal predecessors, (42), 9 states have call successors, (10), 3 states have call predecessors, (10), 6 states have return successors, (12), 6 states have call predecessors, (12), 8 states have call successors, (12) Word has length 53 [2021-12-18 19:35:13,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:35:13,292 INFO L225 Difference]: With dead ends: 526 [2021-12-18 19:35:13,292 INFO L226 Difference]: Without dead ends: 526 [2021-12-18 19:35:13,293 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 96 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 63.8s TimeCoverageRelationStatistics Valid=70, Invalid=286, Unknown=24, NotChecked=0, Total=380 [2021-12-18 19:35:13,293 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 86 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 514 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 407 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 19:35:13,293 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 191 Invalid, 514 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 85 Invalid, 0 Unknown, 407 Unchecked, 0.1s Time] [2021-12-18 19:35:13,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 526 states. [2021-12-18 19:35:13,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 526 to 522. [2021-12-18 19:35:13,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 522 states, 366 states have (on average 1.169398907103825) internal successors, (428), 396 states have internal predecessors, (428), 75 states have call successors, (75), 31 states have call predecessors, (75), 65 states have return successors, (378), 94 states have call predecessors, (378), 75 states have call successors, (378) [2021-12-18 19:35:13,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 522 states to 522 states and 881 transitions. [2021-12-18 19:35:13,320 INFO L78 Accepts]: Start accepts. Automaton has 522 states and 881 transitions. Word has length 53 [2021-12-18 19:35:13,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:35:13,320 INFO L470 AbstractCegarLoop]: Abstraction has 522 states and 881 transitions. [2021-12-18 19:35:13,329 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 3.5) internal successors, (42), 11 states have internal predecessors, (42), 9 states have call successors, (10), 3 states have call predecessors, (10), 6 states have return successors, (12), 6 states have call predecessors, (12), 8 states have call successors, (12) [2021-12-18 19:35:13,329 INFO L276 IsEmpty]: Start isEmpty. Operand 522 states and 881 transitions. [2021-12-18 19:35:13,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-12-18 19:35:13,330 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:35:13,330 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 19:35:13,341 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (55)] Forceful destruction successful, exit code 0 [2021-12-18 19:35:13,547 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (56)] Forceful destruction successful, exit code 0 [2021-12-18 19:35:13,739 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,56 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2021-12-18 19:35:13,739 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting checkErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:35:13,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:35:13,740 INFO L85 PathProgramCache]: Analyzing trace with hash 344803173, now seen corresponding path program 1 times [2021-12-18 19:35:13,740 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:35:13,740 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1515549756] [2021-12-18 19:35:13,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 19:35:13,740 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:35:13,740 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:35:13,741 INFO L229 MonitoredProcess]: Starting monitored process 57 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 19:35:13,743 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (57)] Waiting until timeout for monitored process [2021-12-18 19:35:14,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 19:35:14,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-18 19:35:14,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:35:14,015 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 19:35:14,199 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-18 19:35:14,199 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:35:14,383 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-18 19:35:14,383 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:35:14,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1515549756] [2021-12-18 19:35:14,383 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1515549756] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 19:35:14,383 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:35:14,384 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-12-18 19:35:14,384 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437314712] [2021-12-18 19:35:14,384 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:35:14,384 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-18 19:35:14,384 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:35:14,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-18 19:35:14,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-12-18 19:35:14,385 INFO L87 Difference]: Start difference. First operand 522 states and 881 transitions. Second operand has 11 states, 10 states have (on average 4.1) internal successors, (41), 9 states have internal predecessors, (41), 4 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 4 states have call successors, (11) [2021-12-18 19:35:14,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:35:14,580 INFO L93 Difference]: Finished difference Result 550 states and 918 transitions. [2021-12-18 19:35:14,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-18 19:35:14,581 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 4.1) internal successors, (41), 9 states have internal predecessors, (41), 4 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 4 states have call successors, (11) Word has length 48 [2021-12-18 19:35:14,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:35:14,587 INFO L225 Difference]: With dead ends: 550 [2021-12-18 19:35:14,587 INFO L226 Difference]: Without dead ends: 550 [2021-12-18 19:35:14,588 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 82 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-12-18 19:35:14,593 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 64 mSDsluCounter, 194 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 162 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 19:35:14,593 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 261 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 83 Invalid, 0 Unknown, 162 Unchecked, 0.2s Time] [2021-12-18 19:35:14,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 550 states. [2021-12-18 19:35:14,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 550 to 539. [2021-12-18 19:35:14,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 539 states, 380 states have (on average 1.1789473684210525) internal successors, (448), 410 states have internal predecessors, (448), 76 states have call successors, (76), 33 states have call predecessors, (76), 67 states have return successors, (380), 95 states have call predecessors, (380), 76 states have call successors, (380) [2021-12-18 19:35:14,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 904 transitions. [2021-12-18 19:35:14,615 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 904 transitions. Word has length 48 [2021-12-18 19:35:14,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:35:14,615 INFO L470 AbstractCegarLoop]: Abstraction has 539 states and 904 transitions. [2021-12-18 19:35:14,615 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 4.1) internal successors, (41), 9 states have internal predecessors, (41), 4 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 4 states have call successors, (11) [2021-12-18 19:35:14,615 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 904 transitions. [2021-12-18 19:35:14,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-12-18 19:35:14,617 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:35:14,617 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 19:35:14,643 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (57)] Ended with exit code 0 [2021-12-18 19:35:14,828 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 19:35:14,829 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting checkErr1REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:35:14,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:35:14,829 INFO L85 PathProgramCache]: Analyzing trace with hash 344803174, now seen corresponding path program 1 times [2021-12-18 19:35:14,829 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:35:14,829 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1677374077] [2021-12-18 19:35:14,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 19:35:14,830 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:35:14,830 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:35:14,831 INFO L229 MonitoredProcess]: Starting monitored process 58 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 19:35:14,832 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (58)] Waiting until timeout for monitored process [2021-12-18 19:35:15,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 19:35:15,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-18 19:35:15,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:35:15,056 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 19:35:15,273 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-18 19:35:15,273 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 19:35:16,110 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-18 19:35:16,111 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 19:35:16,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1677374077] [2021-12-18 19:35:16,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1677374077] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 19:35:16,113 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 19:35:16,113 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 16 [2021-12-18 19:35:16,113 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390077628] [2021-12-18 19:35:16,113 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 19:35:16,114 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-18 19:35:16,114 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 19:35:16,114 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-18 19:35:16,114 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-12-18 19:35:16,114 INFO L87 Difference]: Start difference. First operand 539 states and 904 transitions. Second operand has 17 states, 16 states have (on average 3.375) internal successors, (54), 13 states have internal predecessors, (54), 6 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (12), 8 states have call predecessors, (12), 6 states have call successors, (12) [2021-12-18 19:35:17,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 19:35:17,546 INFO L93 Difference]: Finished difference Result 556 states and 926 transitions. [2021-12-18 19:35:17,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-18 19:35:17,547 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 3.375) internal successors, (54), 13 states have internal predecessors, (54), 6 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (12), 8 states have call predecessors, (12), 6 states have call successors, (12) Word has length 48 [2021-12-18 19:35:17,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 19:35:17,549 INFO L225 Difference]: With dead ends: 556 [2021-12-18 19:35:17,549 INFO L226 Difference]: Without dead ends: 556 [2021-12-18 19:35:17,549 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 77 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=88, Invalid=418, Unknown=0, NotChecked=0, Total=506 [2021-12-18 19:35:17,550 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 121 mSDsluCounter, 258 mSDsCounter, 0 mSdLazyCounter, 530 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 318 SdHoareTripleChecker+Invalid, 698 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 530 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 140 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-12-18 19:35:17,550 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [122 Valid, 318 Invalid, 698 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 530 Invalid, 0 Unknown, 140 Unchecked, 1.2s Time] [2021-12-18 19:35:17,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 556 states. [2021-12-18 19:35:17,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 556 to 543. [2021-12-18 19:35:17,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 543 states, 382 states have (on average 1.1701570680628273) internal successors, (447), 412 states have internal predecessors, (447), 78 states have call successors, (78), 33 states have call predecessors, (78), 67 states have return successors, (381), 97 states have call predecessors, (381), 78 states have call successors, (381) [2021-12-18 19:35:17,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 543 states to 543 states and 906 transitions. [2021-12-18 19:35:17,563 INFO L78 Accepts]: Start accepts. Automaton has 543 states and 906 transitions. Word has length 48 [2021-12-18 19:35:17,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 19:35:17,563 INFO L470 AbstractCegarLoop]: Abstraction has 543 states and 906 transitions. [2021-12-18 19:35:17,564 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 3.375) internal successors, (54), 13 states have internal predecessors, (54), 6 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (12), 8 states have call predecessors, (12), 6 states have call successors, (12) [2021-12-18 19:35:17,564 INFO L276 IsEmpty]: Start isEmpty. Operand 543 states and 906 transitions. [2021-12-18 19:35:17,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-12-18 19:35:17,565 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 19:35:17,565 INFO L514 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1] [2021-12-18 19:35:17,575 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (58)] Forceful destruction successful, exit code 0 [2021-12-18 19:35:17,773 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 19:35:17,773 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-18 19:35:17,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 19:35:17,773 INFO L85 PathProgramCache]: Analyzing trace with hash 1190618038, now seen corresponding path program 5 times [2021-12-18 19:35:17,773 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 19:35:17,773 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1921634570] [2021-12-18 19:35:17,773 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-18 19:35:17,773 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 19:35:17,773 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 19:35:17,774 INFO L229 MonitoredProcess]: Starting monitored process 59 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 19:35:17,775 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (59)] Waiting until timeout for monitored process [2021-12-18 19:35:18,211 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-12-18 19:35:18,211 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 19:35:18,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-18 19:35:18,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 19:35:18,232 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 Killed by 15