./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 35987657 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-?-3598765 [2022-07-21 16:44:23,779 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-21 16:44:23,781 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-21 16:44:23,826 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-21 16:44:23,826 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-21 16:44:23,828 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-21 16:44:23,831 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-21 16:44:23,833 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-21 16:44:23,835 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-21 16:44:23,839 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-21 16:44:23,840 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-21 16:44:23,845 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-21 16:44:23,845 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-21 16:44:23,847 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-21 16:44:23,848 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-21 16:44:23,850 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-21 16:44:23,851 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-21 16:44:23,852 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-21 16:44:23,854 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-21 16:44:23,859 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-21 16:44:23,860 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-21 16:44:23,861 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-21 16:44:23,863 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-21 16:44:23,863 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-21 16:44:23,865 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-21 16:44:23,869 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-21 16:44:23,869 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-21 16:44:23,870 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-21 16:44:23,870 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-21 16:44:23,871 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-21 16:44:23,872 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-21 16:44:23,872 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-21 16:44:23,873 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-21 16:44:23,874 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-21 16:44:23,875 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-21 16:44:23,876 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-21 16:44:23,876 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-21 16:44:23,877 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-21 16:44:23,877 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-21 16:44:23,877 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-21 16:44:23,878 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-21 16:44:23,879 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-21 16:44:23,884 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-32bit-Automizer_Default.epf [2022-07-21 16:44:23,914 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-21 16:44:23,915 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-21 16:44:23,915 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-21 16:44:23,915 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-21 16:44:23,916 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-07-21 16:44:23,916 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-07-21 16:44:23,917 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-21 16:44:23,917 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-21 16:44:23,917 INFO L138 SettingsManager]: * Use SBE=true [2022-07-21 16:44:23,918 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-21 16:44:23,918 INFO L138 SettingsManager]: * sizeof long=4 [2022-07-21 16:44:23,918 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-07-21 16:44:23,919 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-07-21 16:44:23,919 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-07-21 16:44:23,919 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-21 16:44:23,919 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-07-21 16:44:23,919 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-07-21 16:44:23,920 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-07-21 16:44:23,920 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-07-21 16:44:23,920 INFO L138 SettingsManager]: * sizeof long double=12 [2022-07-21 16:44:23,920 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-21 16:44:23,920 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-21 16:44:23,921 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-21 16:44:23,921 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-07-21 16:44:23,921 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-21 16:44:23,921 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-21 16:44:23,921 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-07-21 16:44:23,921 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-07-21 16:44:23,922 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-07-21 16:44:23,922 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e98a60ea9ee0c00575c08606ce8b95d0660c5b235c5932147dfee4b13512f57c [2022-07-21 16:44:24,231 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-21 16:44:24,254 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-21 16:44:24,256 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-21 16:44:24,257 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-21 16:44:24,258 INFO L275 PluginConnector]: CDTParser initialized [2022-07-21 16:44:24,260 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/verifythis/tree_max.c [2022-07-21 16:44:24,313 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/775f22870/3203b174b6a347b9a58aa5f46ba9523b/FLAGec0034f33 [2022-07-21 16:44:24,683 INFO L306 CDTParser]: Found 1 translation units. [2022-07-21 16:44:24,683 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_max.c [2022-07-21 16:44:24,691 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/775f22870/3203b174b6a347b9a58aa5f46ba9523b/FLAGec0034f33 [2022-07-21 16:44:25,093 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/775f22870/3203b174b6a347b9a58aa5f46ba9523b [2022-07-21 16:44:25,096 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-21 16:44:25,097 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-21 16:44:25,100 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-21 16:44:25,100 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-21 16:44:25,103 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-21 16:44:25,103 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:44:25" (1/1) ... [2022-07-21 16:44:25,107 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@cfbb63b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:25, skipping insertion in model container [2022-07-21 16:44:25,107 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:44:25" (1/1) ... [2022-07-21 16:44:25,113 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-21 16:44:25,125 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-21 16:44:25,260 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] [2022-07-21 16:44:25,278 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-21 16:44:25,294 ERROR L326 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types of different sizes while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2022-07-21 16:44:25,295 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@3c8d5cfe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:25, skipping insertion in model container [2022-07-21 16:44:25,295 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-21 16:44:25,296 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2022-07-21 16:44:25,298 INFO L158 Benchmark]: Toolchain (without parser) took 199.62ms. Allocated memory is still 54.5MB. Free memory was 31.5MB in the beginning and 36.1MB in the end (delta: -4.6MB). Peak memory consumption was 7.5MB. Max. memory is 16.1GB. [2022-07-21 16:44:25,299 INFO L158 Benchmark]: CDTParser took 0.22ms. Allocated memory is still 54.5MB. Free memory was 36.6MB in the beginning and 36.5MB in the end (delta: 33.4kB). There was no memory consumed. Max. memory is 16.1GB. [2022-07-21 16:44:25,301 INFO L158 Benchmark]: CACSL2BoogieTranslator took 196.04ms. Allocated memory is still 54.5MB. Free memory was 31.4MB in the beginning and 36.1MB in the end (delta: -4.8MB). Peak memory consumption was 7.5MB. Max. memory is 16.1GB. [2022-07-21 16:44:25,305 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22ms. Allocated memory is still 54.5MB. Free memory was 36.6MB in the beginning and 36.5MB in the end (delta: 33.4kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 196.04ms. Allocated memory is still 54.5MB. Free memory was 31.4MB in the beginning and 36.1MB in the end (delta: -4.8MB). Peak memory consumption was 7.5MB. 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 of different sizes 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-?-3598765 [2022-07-21 16:44:26,963 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-21 16:44:26,965 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-21 16:44:27,005 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-21 16:44:27,006 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-21 16:44:27,007 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-21 16:44:27,010 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-21 16:44:27,013 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-21 16:44:27,014 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-21 16:44:27,018 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-21 16:44:27,019 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-21 16:44:27,024 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-21 16:44:27,024 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-21 16:44:27,025 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-21 16:44:27,026 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-21 16:44:27,029 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-21 16:44:27,030 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-21 16:44:27,031 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-21 16:44:27,033 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-21 16:44:27,038 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-21 16:44:27,039 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-21 16:44:27,040 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-21 16:44:27,041 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-21 16:44:27,042 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-21 16:44:27,043 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-21 16:44:27,049 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-21 16:44:27,050 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-21 16:44:27,050 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-21 16:44:27,051 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-21 16:44:27,051 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-21 16:44:27,052 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-21 16:44:27,052 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-21 16:44:27,054 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-21 16:44:27,054 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-21 16:44:27,056 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-21 16:44:27,056 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-21 16:44:27,057 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-21 16:44:27,057 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-21 16:44:27,057 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-21 16:44:27,058 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-21 16:44:27,058 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-21 16:44:27,060 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-21 16:44:27,068 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-32bit-Automizer_Bitvector.epf [2022-07-21 16:44:27,101 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-21 16:44:27,101 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-21 16:44:27,102 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-21 16:44:27,102 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-21 16:44:27,103 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-07-21 16:44:27,103 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-07-21 16:44:27,104 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-21 16:44:27,104 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-21 16:44:27,104 INFO L138 SettingsManager]: * Use SBE=true [2022-07-21 16:44:27,105 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-21 16:44:27,105 INFO L138 SettingsManager]: * sizeof long=4 [2022-07-21 16:44:27,105 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-07-21 16:44:27,105 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-07-21 16:44:27,106 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-07-21 16:44:27,106 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-21 16:44:27,106 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-07-21 16:44:27,106 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-07-21 16:44:27,106 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-07-21 16:44:27,107 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-07-21 16:44:27,107 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2022-07-21 16:44:27,107 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2022-07-21 16:44:27,107 INFO L138 SettingsManager]: * sizeof long double=12 [2022-07-21 16:44:27,107 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-21 16:44:27,108 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-21 16:44:27,108 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-21 16:44:27,108 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-07-21 16:44:27,108 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-21 16:44:27,108 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-21 16:44:27,108 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-07-21 16:44:27,109 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2022-07-21 16:44:27,109 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2022-07-21 16:44:27,109 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-07-21 16:44:27,109 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e98a60ea9ee0c00575c08606ce8b95d0660c5b235c5932147dfee4b13512f57c [2022-07-21 16:44:27,418 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-21 16:44:27,434 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-21 16:44:27,436 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-21 16:44:27,437 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-21 16:44:27,439 INFO L275 PluginConnector]: CDTParser initialized [2022-07-21 16:44:27,440 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/verifythis/tree_max.c [2022-07-21 16:44:27,488 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/489ff5f3b/d82c6ce009bd4393bf004b4b2f047b79/FLAG53f3219e5 [2022-07-21 16:44:27,876 INFO L306 CDTParser]: Found 1 translation units. [2022-07-21 16:44:27,877 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_max.c [2022-07-21 16:44:27,881 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/489ff5f3b/d82c6ce009bd4393bf004b4b2f047b79/FLAG53f3219e5 [2022-07-21 16:44:27,892 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/489ff5f3b/d82c6ce009bd4393bf004b4b2f047b79 [2022-07-21 16:44:27,894 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-21 16:44:27,895 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-21 16:44:27,896 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-21 16:44:27,896 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-21 16:44:27,902 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-21 16:44:27,902 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:44:27" (1/1) ... [2022-07-21 16:44:27,903 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@53f89edb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:27, skipping insertion in model container [2022-07-21 16:44:27,903 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:44:27" (1/1) ... [2022-07-21 16:44:27,909 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-21 16:44:27,921 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-21 16:44:28,030 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] [2022-07-21 16:44:28,044 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-21 16:44:28,064 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2022-07-21 16:44:28,067 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-21 16:44:28,070 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] [2022-07-21 16:44:28,086 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-21 16:44:28,104 INFO L203 MainTranslator]: Completed pre-run [2022-07-21 16:44:28,116 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] [2022-07-21 16:44:28,122 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-21 16:44:28,135 INFO L208 MainTranslator]: Completed translation [2022-07-21 16:44:28,135 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:28 WrapperNode [2022-07-21 16:44:28,136 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-21 16:44:28,137 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-07-21 16:44:28,137 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-07-21 16:44:28,137 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-07-21 16:44:28,142 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:28" (1/1) ... [2022-07-21 16:44:28,150 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:28" (1/1) ... [2022-07-21 16:44:28,164 INFO L137 Inliner]: procedures = 26, calls = 28, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 37 [2022-07-21 16:44:28,165 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-07-21 16:44:28,166 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-07-21 16:44:28,166 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-07-21 16:44:28,166 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-07-21 16:44:28,172 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:28" (1/1) ... [2022-07-21 16:44:28,173 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:28" (1/1) ... [2022-07-21 16:44:28,176 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:28" (1/1) ... [2022-07-21 16:44:28,176 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:28" (1/1) ... [2022-07-21 16:44:28,183 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:28" (1/1) ... [2022-07-21 16:44:28,185 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:28" (1/1) ... [2022-07-21 16:44:28,186 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:28" (1/1) ... [2022-07-21 16:44:28,188 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-07-21 16:44:28,189 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-07-21 16:44:28,189 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-07-21 16:44:28,189 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-07-21 16:44:28,190 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:28" (1/1) ... [2022-07-21 16:44:28,196 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-21 16:44:28,206 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 16:44:28,219 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-07-21 16:44:28,224 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-07-21 16:44:28,246 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-07-21 16:44:28,247 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2022-07-21 16:44:28,247 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-07-21 16:44:28,247 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2022-07-21 16:44:28,247 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-07-21 16:44:28,247 INFO L130 BoogieDeclarations]: Found specification of procedure max [2022-07-21 16:44:28,247 INFO L138 BoogieDeclarations]: Found implementation of procedure max [2022-07-21 16:44:28,248 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2022-07-21 16:44:28,248 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2022-07-21 16:44:28,248 INFO L130 BoogieDeclarations]: Found specification of procedure check [2022-07-21 16:44:28,248 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2022-07-21 16:44:28,248 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-07-21 16:44:28,248 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-07-21 16:44:28,248 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-07-21 16:44:28,249 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2022-07-21 16:44:28,341 INFO L234 CfgBuilder]: Building ICFG [2022-07-21 16:44:28,345 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-07-21 16:44:28,671 INFO L275 CfgBuilder]: Performing block encoding [2022-07-21 16:44:28,677 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-07-21 16:44:28,677 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2022-07-21 16:44:28,679 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:44:28 BoogieIcfgContainer [2022-07-21 16:44:28,679 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-07-21 16:44:28,681 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-07-21 16:44:28,681 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-07-21 16:44:28,684 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-07-21 16:44:28,684 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:44:27" (1/3) ... [2022-07-21 16:44:28,685 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7afd6d2e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:44:28, skipping insertion in model container [2022-07-21 16:44:28,685 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:28" (2/3) ... [2022-07-21 16:44:28,685 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7afd6d2e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:44:28, skipping insertion in model container [2022-07-21 16:44:28,685 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:44:28" (3/3) ... [2022-07-21 16:44:28,687 INFO L111 eAbstractionObserver]: Analyzing ICFG tree_max.c [2022-07-21 16:44:28,698 INFO L201 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-07-21 16:44:28,698 INFO L160 ceAbstractionStarter]: Applying trace abstraction to program that has 20 error locations. [2022-07-21 16:44:28,750 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-21 16:44:28,759 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@3b51dc2a, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@20aa3941 [2022-07-21 16:44:28,759 INFO L358 AbstractCegarLoop]: Starting to check reachability of 20 error locations. [2022-07-21 16:44:28,764 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) [2022-07-21 16:44:28,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-07-21 16:44:28,781 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:44:28,781 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-07-21 16:44:28,783 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-07-21 16:44:28,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:44:28,788 INFO L85 PathProgramCache]: Analyzing trace with hash 73597257, now seen corresponding path program 1 times [2022-07-21 16:44:28,797 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 16:44:28,798 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [662049818] [2022-07-21 16:44:28,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:44:28,799 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 16:44:28,799 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 16:44:28,805 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 16:44:28,848 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2022-07-21 16:44:28,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:44:28,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 3 conjunts are in the unsatisfiable core [2022-07-21 16:44:28,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:44:28,939 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:44:28,954 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:44:28,954 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 16:44:28,955 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 16:44:28,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [662049818] [2022-07-21 16:44:28,955 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [662049818] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 16:44:28,956 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 16:44:28,956 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-21 16:44:28,957 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112694673] [2022-07-21 16:44:28,958 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 16:44:28,961 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-21 16:44:28,961 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 16:44:28,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-21 16:44:28,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-21 16:44:28,984 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) [2022-07-21 16:44:29,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:44:29,098 INFO L93 Difference]: Finished difference Result 73 states and 86 transitions. [2022-07-21 16:44:29,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-21 16:44:29,100 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 [2022-07-21 16:44:29,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:44:29,109 INFO L225 Difference]: With dead ends: 73 [2022-07-21 16:44:29,109 INFO L226 Difference]: Without dead ends: 71 [2022-07-21 16:44:29,110 INFO L412 NwaCegarLoop]: 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 [2022-07-21 16:44:29,113 INFO L413 NwaCegarLoop]: 83 mSDtfsCounter, 6 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s 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 [2022-07-21 16:44:29,114 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 133 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-21 16:44:29,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-07-21 16:44:29,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 69. [2022-07-21 16:44:29,149 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) [2022-07-21 16:44:29,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 80 transitions. [2022-07-21 16:44:29,160 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 80 transitions. Word has length 5 [2022-07-21 16:44:29,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:44:29,161 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 80 transitions. [2022-07-21 16:44:29,161 INFO L496 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) [2022-07-21 16:44:29,161 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 80 transitions. [2022-07-21 16:44:29,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-07-21 16:44:29,162 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:44:29,163 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-07-21 16:44:29,183 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2022-07-21 16:44:29,372 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 16:44:29,373 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-07-21 16:44:29,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:44:29,374 INFO L85 PathProgramCache]: Analyzing trace with hash 73597258, now seen corresponding path program 1 times [2022-07-21 16:44:29,375 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 16:44:29,375 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1020242113] [2022-07-21 16:44:29,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:44:29,375 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 16:44:29,376 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 16:44:29,377 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 16:44:29,379 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2022-07-21 16:44:29,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:44:29,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2022-07-21 16:44:29,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:44:29,442 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:44:29,455 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:44:29,455 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 16:44:29,456 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 16:44:29,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1020242113] [2022-07-21 16:44:29,459 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1020242113] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 16:44:29,460 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 16:44:29,460 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-21 16:44:29,461 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239801712] [2022-07-21 16:44:29,461 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 16:44:29,462 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-21 16:44:29,462 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 16:44:29,463 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-21 16:44:29,463 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-21 16:44:29,463 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) [2022-07-21 16:44:29,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:44:29,551 INFO L93 Difference]: Finished difference Result 68 states and 79 transitions. [2022-07-21 16:44:29,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-21 16:44:29,554 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 [2022-07-21 16:44:29,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:44:29,555 INFO L225 Difference]: With dead ends: 68 [2022-07-21 16:44:29,555 INFO L226 Difference]: Without dead ends: 68 [2022-07-21 16:44:29,555 INFO L412 NwaCegarLoop]: 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 [2022-07-21 16:44:29,556 INFO L413 NwaCegarLoop]: 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 [2022-07-21 16:44:29,556 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 132 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-21 16:44:29,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-07-21 16:44:29,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2022-07-21 16:44:29,565 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) [2022-07-21 16:44:29,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 79 transitions. [2022-07-21 16:44:29,571 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 79 transitions. Word has length 5 [2022-07-21 16:44:29,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:44:29,571 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 79 transitions. [2022-07-21 16:44:29,572 INFO L496 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) [2022-07-21 16:44:29,572 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 79 transitions. [2022-07-21 16:44:29,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-07-21 16:44:29,573 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:44:29,573 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:44:29,584 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2022-07-21 16:44:29,781 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 16:44:29,782 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-07-21 16:44:29,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:44:29,783 INFO L85 PathProgramCache]: Analyzing trace with hash -345289291, now seen corresponding path program 1 times [2022-07-21 16:44:29,783 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 16:44:29,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1808729551] [2022-07-21 16:44:29,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:44:29,783 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 16:44:29,784 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 16:44:29,785 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 16:44:29,809 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2022-07-21 16:44:29,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:44:29,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 13 conjunts are in the unsatisfiable core [2022-07-21 16:44:29,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:44:29,917 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:44:29,918 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 16:44:29,918 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 16:44:29,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1808729551] [2022-07-21 16:44:29,918 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1808729551] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 16:44:29,918 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 16:44:29,919 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-07-21 16:44:29,919 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774647518] [2022-07-21 16:44:29,919 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 16:44:29,919 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-07-21 16:44:29,920 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 16:44:29,920 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-07-21 16:44:29,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-07-21 16:44:29,920 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) [2022-07-21 16:44:30,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:44:30,057 INFO L93 Difference]: Finished difference Result 83 states and 98 transitions. [2022-07-21 16:44:30,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-21 16:44:30,058 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 [2022-07-21 16:44:30,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:44:30,059 INFO L225 Difference]: With dead ends: 83 [2022-07-21 16:44:30,059 INFO L226 Difference]: Without dead ends: 83 [2022-07-21 16:44:30,059 INFO L412 NwaCegarLoop]: 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 [2022-07-21 16:44:30,060 INFO L413 NwaCegarLoop]: 77 mSDtfsCounter, 11 mSDsluCounter, 355 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 432 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-21 16:44:30,061 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 432 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-21 16:44:30,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-07-21 16:44:30,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 76. [2022-07-21 16:44:30,068 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) [2022-07-21 16:44:30,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 89 transitions. [2022-07-21 16:44:30,069 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 89 transitions. Word has length 11 [2022-07-21 16:44:30,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:44:30,069 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 89 transitions. [2022-07-21 16:44:30,070 INFO L496 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) [2022-07-21 16:44:30,070 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 89 transitions. [2022-07-21 16:44:30,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-07-21 16:44:30,070 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:44:30,070 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:44:30,081 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2022-07-21 16:44:30,279 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 16:44:30,279 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-07-21 16:44:30,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:44:30,280 INFO L85 PathProgramCache]: Analyzing trace with hash -159104294, now seen corresponding path program 1 times [2022-07-21 16:44:30,280 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 16:44:30,280 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1199149383] [2022-07-21 16:44:30,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:44:30,280 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 16:44:30,281 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 16:44:30,282 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 16:44:30,283 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2022-07-21 16:44:30,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:44:30,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 5 conjunts are in the unsatisfiable core [2022-07-21 16:44:30,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:44:30,334 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:44:30,356 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:44:30,356 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 16:44:30,357 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 16:44:30,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1199149383] [2022-07-21 16:44:30,357 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1199149383] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 16:44:30,357 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 16:44:30,357 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-21 16:44:30,357 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418967552] [2022-07-21 16:44:30,358 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 16:44:30,358 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-07-21 16:44:30,358 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 16:44:30,359 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-07-21 16:44:30,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-07-21 16:44:30,359 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) [2022-07-21 16:44:30,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:44:30,560 INFO L93 Difference]: Finished difference Result 80 states and 93 transitions. [2022-07-21 16:44:30,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-07-21 16:44:30,561 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 [2022-07-21 16:44:30,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:44:30,562 INFO L225 Difference]: With dead ends: 80 [2022-07-21 16:44:30,562 INFO L226 Difference]: Without dead ends: 80 [2022-07-21 16:44:30,562 INFO L412 NwaCegarLoop]: 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 [2022-07-21 16:44:30,565 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 49 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s 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 [2022-07-21 16:44:30,566 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 72 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-21 16:44:30,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-07-21 16:44:30,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 78. [2022-07-21 16:44:30,572 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) [2022-07-21 16:44:30,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 93 transitions. [2022-07-21 16:44:30,573 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 93 transitions. Word has length 11 [2022-07-21 16:44:30,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:44:30,573 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 93 transitions. [2022-07-21 16:44:30,574 INFO L496 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) [2022-07-21 16:44:30,574 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 93 transitions. [2022-07-21 16:44:30,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-07-21 16:44:30,574 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:44:30,574 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:44:30,585 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2022-07-21 16:44:30,775 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 16:44:30,775 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting nondet_treeErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-07-21 16:44:30,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:44:30,776 INFO L85 PathProgramCache]: Analyzing trace with hash -159104293, now seen corresponding path program 1 times [2022-07-21 16:44:30,776 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 16:44:30,777 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1829529435] [2022-07-21 16:44:30,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:44:30,777 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 16:44:30,777 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 16:44:30,778 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 16:44:30,780 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2022-07-21 16:44:30,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:44:30,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 6 conjunts are in the unsatisfiable core [2022-07-21 16:44:30,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:44:30,832 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:44:30,887 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:44:30,891 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 16:44:30,891 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 16:44:30,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1829529435] [2022-07-21 16:44:30,891 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1829529435] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 16:44:30,892 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 16:44:30,892 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-21 16:44:30,892 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839124788] [2022-07-21 16:44:30,892 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 16:44:30,893 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-07-21 16:44:30,893 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 16:44:30,893 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-07-21 16:44:30,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-07-21 16:44:30,894 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) [2022-07-21 16:44:31,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:44:31,110 INFO L93 Difference]: Finished difference Result 84 states and 103 transitions. [2022-07-21 16:44:31,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-07-21 16:44:31,111 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 [2022-07-21 16:44:31,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:44:31,112 INFO L225 Difference]: With dead ends: 84 [2022-07-21 16:44:31,112 INFO L226 Difference]: Without dead ends: 84 [2022-07-21 16:44:31,112 INFO L412 NwaCegarLoop]: 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 [2022-07-21 16:44:31,113 INFO L413 NwaCegarLoop]: 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 [2022-07-21 16:44:31,113 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 83 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-21 16:44:31,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-07-21 16:44:31,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 81. [2022-07-21 16:44:31,126 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) [2022-07-21 16:44:31,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 97 transitions. [2022-07-21 16:44:31,128 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 97 transitions. Word has length 11 [2022-07-21 16:44:31,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:44:31,128 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 97 transitions. [2022-07-21 16:44:31,128 INFO L496 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) [2022-07-21 16:44:31,128 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 97 transitions. [2022-07-21 16:44:31,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-07-21 16:44:31,129 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:44:31,129 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:44:31,139 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2022-07-21 16:44:31,332 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 16:44:31,332 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting checkErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-07-21 16:44:31,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:44:31,333 INFO L85 PathProgramCache]: Analyzing trace with hash -1041946460, now seen corresponding path program 1 times [2022-07-21 16:44:31,333 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 16:44:31,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2065751507] [2022-07-21 16:44:31,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:44:31,333 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 16:44:31,333 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 16:44:31,334 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 16:44:31,336 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2022-07-21 16:44:31,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:44:31,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 13 conjunts are in the unsatisfiable core [2022-07-21 16:44:31,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:44:31,460 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:44:31,461 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 16:44:31,461 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 16:44:31,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2065751507] [2022-07-21 16:44:31,461 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2065751507] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 16:44:31,462 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 16:44:31,462 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-07-21 16:44:31,462 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847276277] [2022-07-21 16:44:31,462 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 16:44:31,463 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-07-21 16:44:31,463 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 16:44:31,463 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-07-21 16:44:31,463 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-07-21 16:44:31,464 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) [2022-07-21 16:44:31,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:44:31,555 INFO L93 Difference]: Finished difference Result 92 states and 109 transitions. [2022-07-21 16:44:31,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-21 16:44:31,556 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 [2022-07-21 16:44:31,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:44:31,557 INFO L225 Difference]: With dead ends: 92 [2022-07-21 16:44:31,557 INFO L226 Difference]: Without dead ends: 92 [2022-07-21 16:44:31,557 INFO L412 NwaCegarLoop]: 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 [2022-07-21 16:44:31,558 INFO L413 NwaCegarLoop]: 77 mSDtfsCounter, 10 mSDsluCounter, 355 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 432 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-21 16:44:31,558 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 432 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-21 16:44:31,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-07-21 16:44:31,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 87. [2022-07-21 16:44:31,566 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) [2022-07-21 16:44:31,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 103 transitions. [2022-07-21 16:44:31,567 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 103 transitions. Word has length 17 [2022-07-21 16:44:31,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:44:31,567 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 103 transitions. [2022-07-21 16:44:31,567 INFO L496 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) [2022-07-21 16:44:31,568 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 103 transitions. [2022-07-21 16:44:31,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-07-21 16:44:31,568 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:44:31,569 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:44:31,579 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2022-07-21 16:44:31,777 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 16:44:31,777 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONMEMORY_LEAK === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-07-21 16:44:31,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:44:31,778 INFO L85 PathProgramCache]: Analyzing trace with hash -868680531, now seen corresponding path program 1 times [2022-07-21 16:44:31,778 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 16:44:31,778 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [473621881] [2022-07-21 16:44:31,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:44:31,778 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 16:44:31,779 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 16:44:31,780 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 16:44:31,780 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2022-07-21 16:44:31,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:44:31,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 4 conjunts are in the unsatisfiable core [2022-07-21 16:44:31,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:44:31,845 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 16:44:31,845 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 16:44:31,845 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 16:44:31,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [473621881] [2022-07-21 16:44:31,845 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [473621881] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 16:44:31,845 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 16:44:31,846 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-21 16:44:31,846 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657910497] [2022-07-21 16:44:31,846 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 16:44:31,846 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-07-21 16:44:31,846 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 16:44:31,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-07-21 16:44:31,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-07-21 16:44:31,847 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) [2022-07-21 16:44:31,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:44:31,996 INFO L93 Difference]: Finished difference Result 89 states and 104 transitions. [2022-07-21 16:44:31,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-07-21 16:44:31,998 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 [2022-07-21 16:44:31,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:44:31,999 INFO L225 Difference]: With dead ends: 89 [2022-07-21 16:44:31,999 INFO L226 Difference]: Without dead ends: 75 [2022-07-21 16:44:31,999 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-07-21 16:44:32,000 INFO L413 NwaCegarLoop]: 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, 0.1s IncrementalHoareTripleChecker+Time [2022-07-21 16:44:32,000 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 82 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-21 16:44:32,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-07-21 16:44:32,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2022-07-21 16:44:32,005 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) [2022-07-21 16:44:32,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2022-07-21 16:44:32,006 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 20 [2022-07-21 16:44:32,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:44:32,006 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2022-07-21 16:44:32,006 INFO L496 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) [2022-07-21 16:44:32,006 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2022-07-21 16:44:32,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-07-21 16:44:32,007 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:44:32,007 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:44:32,022 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2022-07-21 16:44:32,207 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 16:44:32,208 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-07-21 16:44:32,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:44:32,208 INFO L85 PathProgramCache]: Analyzing trace with hash -360622958, now seen corresponding path program 1 times [2022-07-21 16:44:32,208 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 16:44:32,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1964006169] [2022-07-21 16:44:32,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:44:32,209 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 16:44:32,209 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 16:44:32,210 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 16:44:32,211 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2022-07-21 16:44:32,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:44:32,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 11 conjunts are in the unsatisfiable core [2022-07-21 16:44:32,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:44:32,348 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:44:32,508 INFO L356 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-07-21 16:44:32,508 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 18 treesize of output 25 [2022-07-21 16:44:32,520 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-07-21 16:44:32,521 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:44:32,643 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 16:44:32,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1964006169] [2022-07-21 16:44:32,644 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1964006169] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:44:32,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [649906835] [2022-07-21 16:44:32,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:44:32,644 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-21 16:44:32,645 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-21 16:44:32,647 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) [2022-07-21 16:44:32,662 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2022-07-21 16:44:32,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:44:32,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 12 conjunts are in the unsatisfiable core [2022-07-21 16:44:32,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:44:32,834 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:44:34,940 INFO L356 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2022-07-21 16:44:34,940 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 17 [2022-07-21 16:44:34,947 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-07-21 16:44:34,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:44:35,085 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [649906835] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:44:35,085 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 16:44:35,085 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2022-07-21 16:44:35,085 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1533960478] [2022-07-21 16:44:35,086 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 16:44:35,086 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-07-21 16:44:35,086 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 16:44:35,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-07-21 16:44:35,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=27, Unknown=1, NotChecked=0, Total=42 [2022-07-21 16:44:35,087 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) [2022-07-21 16:44:41,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:44:41,285 INFO L93 Difference]: Finished difference Result 84 states and 105 transitions. [2022-07-21 16:44:41,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-21 16:44:41,285 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 [2022-07-21 16:44:41,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:44:41,286 INFO L225 Difference]: With dead ends: 84 [2022-07-21 16:44:41,286 INFO L226 Difference]: Without dead ends: 84 [2022-07-21 16:44:41,287 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 58 SyntacticMatches, 7 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=26, Invalid=44, Unknown=2, NotChecked=0, Total=72 [2022-07-21 16:44:41,287 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 46 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s 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, 0.1s IncrementalHoareTripleChecker+Time [2022-07-21 16:44:41,288 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 102 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 96 Invalid, 0 Unknown, 157 Unchecked, 0.1s Time] [2022-07-21 16:44:41,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-07-21 16:44:41,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 79. [2022-07-21 16:44:41,293 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) [2022-07-21 16:44:41,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 98 transitions. [2022-07-21 16:44:41,294 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 98 transitions. Word has length 29 [2022-07-21 16:44:41,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:44:41,295 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 98 transitions. [2022-07-21 16:44:41,295 INFO L496 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) [2022-07-21 16:44:41,295 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 98 transitions. [2022-07-21 16:44:41,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-07-21 16:44:41,296 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:44:41,296 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:44:41,307 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2022-07-21 16:44:41,507 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2022-07-21 16:44:41,705 WARN L477 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 [2022-07-21 16:44:41,706 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting nondet_treeErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-07-21 16:44:41,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:44:41,706 INFO L85 PathProgramCache]: Analyzing trace with hash -360622957, now seen corresponding path program 1 times [2022-07-21 16:44:41,706 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 16:44:41,707 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1389015232] [2022-07-21 16:44:41,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:44:41,707 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 16:44:41,707 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 16:44:41,708 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 16:44:41,709 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2022-07-21 16:44:41,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:44:41,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 16 conjunts are in the unsatisfiable core [2022-07-21 16:44:41,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:44:41,880 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:44:41,884 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:44:46,091 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 16:44:46,093 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-21 16:44:46,102 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-21 16:44:46,102 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 12 [2022-07-21 16:44:46,121 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-07-21 16:44:46,121 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:44:48,416 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 16:44:48,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1389015232] [2022-07-21 16:44:48,416 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1389015232] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:44:48,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1719543708] [2022-07-21 16:44:48,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:44:48,416 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-21 16:44:48,417 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-21 16:44:48,418 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) [2022-07-21 16:44:48,419 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2022-07-21 16:44:48,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:44:48,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 16 conjunts are in the unsatisfiable core [2022-07-21 16:44:48,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:44:48,621 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:44:48,627 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:44:54,841 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 16:44:54,842 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-21 16:44:54,852 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-21 16:44:54,853 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 12 [2022-07-21 16:44:54,860 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-07-21 16:44:54,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:44:57,134 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1719543708] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:44:57,134 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 16:44:57,134 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2022-07-21 16:44:57,135 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111862008] [2022-07-21 16:44:57,135 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 16:44:57,135 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-07-21 16:44:57,135 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 16:44:57,135 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-07-21 16:44:57,135 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=51, Unknown=1, NotChecked=0, Total=72 [2022-07-21 16:44:57,136 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) [2022-07-21 16:44:57,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:44:57,408 INFO L93 Difference]: Finished difference Result 98 states and 130 transitions. [2022-07-21 16:44:57,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-07-21 16:44:57,408 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 [2022-07-21 16:44:57,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:44:57,409 INFO L225 Difference]: With dead ends: 98 [2022-07-21 16:44:57,409 INFO L226 Difference]: Without dead ends: 98 [2022-07-21 16:44:57,410 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 48 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 14.5s TimeCoverageRelationStatistics Valid=27, Invalid=62, Unknown=1, NotChecked=0, Total=90 [2022-07-21 16:44:57,410 INFO L413 NwaCegarLoop]: 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 [2022-07-21 16:44:57,410 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 101 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 111 Invalid, 0 Unknown, 92 Unchecked, 0.2s Time] [2022-07-21 16:44:57,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-07-21 16:44:57,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 95. [2022-07-21 16:44:57,418 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) [2022-07-21 16:44:57,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 121 transitions. [2022-07-21 16:44:57,419 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 121 transitions. Word has length 29 [2022-07-21 16:44:57,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:44:57,419 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 121 transitions. [2022-07-21 16:44:57,420 INFO L496 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) [2022-07-21 16:44:57,420 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 121 transitions. [2022-07-21 16:44:57,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-07-21 16:44:57,421 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:44:57,421 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:44:57,434 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2022-07-21 16:44:57,633 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (12)] Forceful destruction successful, exit code 0 [2022-07-21 16:44:57,831 WARN L477 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 [2022-07-21 16:44:57,832 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-07-21 16:44:57,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:44:57,832 INFO L85 PathProgramCache]: Analyzing trace with hash -694882647, now seen corresponding path program 1 times [2022-07-21 16:44:57,833 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 16:44:57,833 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [692845132] [2022-07-21 16:44:57,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:44:57,833 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 16:44:57,833 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 16:44:57,834 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 16:44:57,835 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2022-07-21 16:44:57,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:44:57,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 13 conjunts are in the unsatisfiable core [2022-07-21 16:44:57,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:44:57,913 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:44:58,015 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-07-21 16:44:58,015 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:44:58,192 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-07-21 16:44:58,192 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 16:44:58,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [692845132] [2022-07-21 16:44:58,193 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [692845132] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 16:44:58,193 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 16:44:58,193 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2022-07-21 16:44:58,193 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618286518] [2022-07-21 16:44:58,193 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 16:44:58,193 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-21 16:44:58,193 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 16:44:58,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-21 16:44:58,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2022-07-21 16:44:58,194 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) [2022-07-21 16:44:58,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:44:58,623 INFO L93 Difference]: Finished difference Result 116 states and 148 transitions. [2022-07-21 16:44:58,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-07-21 16:44:58,624 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 [2022-07-21 16:44:58,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:44:58,625 INFO L225 Difference]: With dead ends: 116 [2022-07-21 16:44:58,625 INFO L226 Difference]: Without dead ends: 114 [2022-07-21 16:44:58,625 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2022-07-21 16:44:58,625 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 52 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 288 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 302 SdHoareTripleChecker+Invalid, 395 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 288 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 92 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-07-21 16:44:58,626 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 302 Invalid, 395 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 288 Invalid, 0 Unknown, 92 Unchecked, 0.4s Time] [2022-07-21 16:44:58,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2022-07-21 16:44:58,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 108. [2022-07-21 16:44:58,638 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) [2022-07-21 16:44:58,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 141 transitions. [2022-07-21 16:44:58,643 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 141 transitions. Word has length 25 [2022-07-21 16:44:58,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:44:58,643 INFO L495 AbstractCegarLoop]: Abstraction has 108 states and 141 transitions. [2022-07-21 16:44:58,643 INFO L496 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) [2022-07-21 16:44:58,643 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 141 transitions. [2022-07-21 16:44:58,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-07-21 16:44:58,644 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:44:58,644 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:44:58,654 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2022-07-21 16:44:58,845 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 16:44:58,845 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-07-21 16:44:58,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:44:58,846 INFO L85 PathProgramCache]: Analyzing trace with hash -694882646, now seen corresponding path program 1 times [2022-07-21 16:44:58,846 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 16:44:58,846 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1430289583] [2022-07-21 16:44:58,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:44:58,846 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 16:44:58,846 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 16:44:58,848 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) [2022-07-21 16:44:58,849 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2022-07-21 16:44:58,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:44:58,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 20 conjunts are in the unsatisfiable core [2022-07-21 16:44:58,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:44:58,924 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:44:59,126 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-07-21 16:44:59,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:45:00,017 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-07-21 16:45:00,017 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 16:45:00,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1430289583] [2022-07-21 16:45:00,017 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1430289583] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 16:45:00,017 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 16:45:00,017 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2022-07-21 16:45:00,017 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497854590] [2022-07-21 16:45:00,018 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 16:45:00,018 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-07-21 16:45:00,018 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 16:45:00,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-07-21 16:45:00,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2022-07-21 16:45:00,019 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) [2022-07-21 16:45:01,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:45:01,226 INFO L93 Difference]: Finished difference Result 133 states and 176 transitions. [2022-07-21 16:45:01,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-07-21 16:45:01,227 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 [2022-07-21 16:45:01,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:45:01,228 INFO L225 Difference]: With dead ends: 133 [2022-07-21 16:45:01,229 INFO L226 Difference]: Without dead ends: 133 [2022-07-21 16:45:01,229 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=54, Invalid=288, Unknown=0, NotChecked=0, Total=342 [2022-07-21 16:45:01,229 INFO L413 NwaCegarLoop]: 73 mSDtfsCounter, 62 mSDsluCounter, 391 mSDsCounter, 0 mSdLazyCounter, 440 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 464 SdHoareTripleChecker+Invalid, 548 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 90 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-07-21 16:45:01,230 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [64 Valid, 464 Invalid, 548 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 440 Invalid, 0 Unknown, 90 Unchecked, 1.1s Time] [2022-07-21 16:45:01,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2022-07-21 16:45:01,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 124. [2022-07-21 16:45:01,236 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) [2022-07-21 16:45:01,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 162 transitions. [2022-07-21 16:45:01,237 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 162 transitions. Word has length 25 [2022-07-21 16:45:01,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:45:01,238 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 162 transitions. [2022-07-21 16:45:01,238 INFO L496 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) [2022-07-21 16:45:01,238 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 162 transitions. [2022-07-21 16:45:01,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-07-21 16:45:01,239 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:45:01,240 INFO L195 NwaCegarLoop]: 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] [2022-07-21 16:45:01,254 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2022-07-21 16:45:01,448 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 16:45:01,449 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting checkErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-07-21 16:45:01,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:45:01,449 INFO L85 PathProgramCache]: Analyzing trace with hash 986137240, now seen corresponding path program 1 times [2022-07-21 16:45:01,449 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 16:45:01,450 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1570442516] [2022-07-21 16:45:01,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:45:01,450 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 16:45:01,450 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 16:45:01,452 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 16:45:01,453 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2022-07-21 16:45:01,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:45:01,543 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 8 conjunts are in the unsatisfiable core [2022-07-21 16:45:01,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:45:01,616 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-07-21 16:45:01,616 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 16:45:01,616 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 16:45:01,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1570442516] [2022-07-21 16:45:01,616 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1570442516] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 16:45:01,616 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 16:45:01,616 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-07-21 16:45:01,616 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803580892] [2022-07-21 16:45:01,617 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 16:45:01,617 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-07-21 16:45:01,617 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 16:45:01,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-07-21 16:45:01,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-07-21 16:45:01,618 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) [2022-07-21 16:45:01,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:45:01,858 INFO L93 Difference]: Finished difference Result 130 states and 171 transitions. [2022-07-21 16:45:01,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-21 16:45:01,861 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 [2022-07-21 16:45:01,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:45:01,862 INFO L225 Difference]: With dead ends: 130 [2022-07-21 16:45:01,863 INFO L226 Difference]: Without dead ends: 126 [2022-07-21 16:45:01,863 INFO L412 NwaCegarLoop]: 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 [2022-07-21 16:45:01,863 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 29 mSDsluCounter, 298 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 357 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 16:45:01,864 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 357 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-21 16:45:01,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-07-21 16:45:01,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 124. [2022-07-21 16:45:01,868 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) [2022-07-21 16:45:01,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 160 transitions. [2022-07-21 16:45:01,869 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 160 transitions. Word has length 31 [2022-07-21 16:45:01,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:45:01,869 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 160 transitions. [2022-07-21 16:45:01,869 INFO L496 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) [2022-07-21 16:45:01,870 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 160 transitions. [2022-07-21 16:45:01,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-07-21 16:45:01,871 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:45:01,871 INFO L195 NwaCegarLoop]: 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] [2022-07-21 16:45:01,878 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2022-07-21 16:45:02,075 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 16:45:02,076 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-07-21 16:45:02,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:45:02,076 INFO L85 PathProgramCache]: Analyzing trace with hash 1746105865, now seen corresponding path program 1 times [2022-07-21 16:45:02,077 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 16:45:02,078 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [98742553] [2022-07-21 16:45:02,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:45:02,078 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 16:45:02,078 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 16:45:02,079 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 16:45:02,082 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2022-07-21 16:45:02,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:45:02,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 37 conjunts are in the unsatisfiable core [2022-07-21 16:45:02,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:45:02,256 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-07-21 16:45:02,265 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-07-21 16:45:02,331 INFO L356 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2022-07-21 16:45:02,332 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2022-07-21 16:45:02,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 16:45:02,344 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2022-07-21 16:45:02,577 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2022-07-21 16:45:02,581 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2022-07-21 16:45:02,700 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-21 16:45:02,700 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:45:03,357 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-21 16:45:03,358 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 16:45:03,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [98742553] [2022-07-21 16:45:03,358 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [98742553] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 16:45:03,358 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 16:45:03,358 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2022-07-21 16:45:03,358 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260042555] [2022-07-21 16:45:03,358 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 16:45:03,358 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-07-21 16:45:03,358 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 16:45:03,359 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-07-21 16:45:03,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2022-07-21 16:45:03,359 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) [2022-07-21 16:45:04,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:45:04,118 INFO L93 Difference]: Finished difference Result 139 states and 178 transitions. [2022-07-21 16:45:04,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-07-21 16:45:04,119 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 [2022-07-21 16:45:04,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:45:04,120 INFO L225 Difference]: With dead ends: 139 [2022-07-21 16:45:04,120 INFO L226 Difference]: Without dead ends: 139 [2022-07-21 16:45:04,120 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2022-07-21 16:45:04,120 INFO L413 NwaCegarLoop]: 77 mSDtfsCounter, 38 mSDsluCounter, 728 mSDsCounter, 0 mSdLazyCounter, 296 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 805 SdHoareTripleChecker+Invalid, 397 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 89 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-07-21 16:45:04,121 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 805 Invalid, 397 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 296 Invalid, 0 Unknown, 89 Unchecked, 0.5s Time] [2022-07-21 16:45:04,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2022-07-21 16:45:04,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 131. [2022-07-21 16:45:04,126 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) [2022-07-21 16:45:04,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 166 transitions. [2022-07-21 16:45:04,127 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 166 transitions. Word has length 31 [2022-07-21 16:45:04,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:45:04,127 INFO L495 AbstractCegarLoop]: Abstraction has 131 states and 166 transitions. [2022-07-21 16:45:04,127 INFO L496 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) [2022-07-21 16:45:04,127 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 166 transitions. [2022-07-21 16:45:04,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-07-21 16:45:04,128 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:45:04,129 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-07-21 16:45:04,149 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Ended with exit code 0 [2022-07-21 16:45:04,336 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 16:45:04,337 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting nondet_treeErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-07-21 16:45:04,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:45:04,337 INFO L85 PathProgramCache]: Analyzing trace with hash -1427695233, now seen corresponding path program 1 times [2022-07-21 16:45:04,337 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 16:45:04,338 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2091761121] [2022-07-21 16:45:04,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:45:04,338 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 16:45:04,338 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 16:45:04,339 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 16:45:04,340 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2022-07-21 16:45:04,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:45:04,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 13 conjunts are in the unsatisfiable core [2022-07-21 16:45:04,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:45:04,462 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:45:04,620 INFO L356 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-07-21 16:45:04,621 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 18 treesize of output 25 [2022-07-21 16:45:04,629 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-07-21 16:45:04,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:45:04,751 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 16:45:04,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2091761121] [2022-07-21 16:45:04,751 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2091761121] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:45:04,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [890905821] [2022-07-21 16:45:04,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:45:04,751 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-21 16:45:04,752 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-21 16:45:04,756 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-07-21 16:45:04,771 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2022-07-21 16:45:04,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:45:04,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 14 conjunts are in the unsatisfiable core [2022-07-21 16:45:04,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:45:04,944 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:45:07,046 INFO L356 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2022-07-21 16:45:07,046 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 17 [2022-07-21 16:45:07,052 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-07-21 16:45:07,052 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:45:07,147 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [890905821] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:45:07,147 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 16:45:07,148 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2022-07-21 16:45:07,148 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2119348401] [2022-07-21 16:45:07,148 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 16:45:07,148 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-07-21 16:45:07,149 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 16:45:07,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-07-21 16:45:07,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=27, Unknown=1, NotChecked=0, Total=42 [2022-07-21 16:45:07,149 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) [2022-07-21 16:45:13,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:45:13,366 INFO L93 Difference]: Finished difference Result 133 states and 168 transitions. [2022-07-21 16:45:13,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-21 16:45:13,367 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 [2022-07-21 16:45:13,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:45:13,368 INFO L225 Difference]: With dead ends: 133 [2022-07-21 16:45:13,368 INFO L226 Difference]: Without dead ends: 133 [2022-07-21 16:45:13,368 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 62 SyntacticMatches, 7 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=26, Invalid=44, Unknown=2, NotChecked=0, Total=72 [2022-07-21 16:45:13,369 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 44 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s 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 [2022-07-21 16:45:13,369 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 100 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 92 Invalid, 0 Unknown, 160 Unchecked, 0.2s Time] [2022-07-21 16:45:13,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2022-07-21 16:45:13,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 131. [2022-07-21 16:45:13,373 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) [2022-07-21 16:45:13,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 166 transitions. [2022-07-21 16:45:13,375 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 166 transitions. Word has length 31 [2022-07-21 16:45:13,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:45:13,375 INFO L495 AbstractCegarLoop]: Abstraction has 131 states and 166 transitions. [2022-07-21 16:45:13,375 INFO L496 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) [2022-07-21 16:45:13,375 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 166 transitions. [2022-07-21 16:45:13,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-07-21 16:45:13,376 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:45:13,376 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-07-21 16:45:13,387 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2022-07-21 16:45:13,582 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Forceful destruction successful, exit code 0 [2022-07-21 16:45:13,777 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2022-07-21 16:45:13,777 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting nondet_treeErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-07-21 16:45:13,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:45:13,777 INFO L85 PathProgramCache]: Analyzing trace with hash -592661436, now seen corresponding path program 1 times [2022-07-21 16:45:13,778 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 16:45:13,778 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [714964341] [2022-07-21 16:45:13,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:45:13,778 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 16:45:13,778 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 16:45:13,779 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 16:45:13,781 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2022-07-21 16:45:13,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:45:13,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 20 conjunts are in the unsatisfiable core [2022-07-21 16:45:13,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:45:13,955 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:45:13,960 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:45:20,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 16:45:20,196 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-21 16:45:20,207 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-21 16:45:20,207 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 12 [2022-07-21 16:45:20,232 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 14 proven. 21 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-07-21 16:45:20,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:45:22,505 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 16:45:22,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [714964341] [2022-07-21 16:45:22,505 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [714964341] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:45:22,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1047411926] [2022-07-21 16:45:22,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:45:22,506 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-21 16:45:22,506 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-21 16:45:22,507 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-07-21 16:45:22,510 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2022-07-21 16:45:22,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:45:22,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 20 conjunts are in the unsatisfiable core [2022-07-21 16:45:22,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:45:22,704 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:45:22,708 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:45:26,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 16:45:26,937 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-21 16:45:26,946 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-21 16:45:26,946 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 12 [2022-07-21 16:45:26,952 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 14 proven. 21 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-07-21 16:45:26,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:45:29,171 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1047411926] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:45:29,171 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 16:45:29,171 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2022-07-21 16:45:29,171 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235514685] [2022-07-21 16:45:29,171 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 16:45:29,172 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-07-21 16:45:29,172 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 16:45:29,172 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-07-21 16:45:29,172 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=50, Unknown=2, NotChecked=0, Total=72 [2022-07-21 16:45:29,172 INFO L87 Difference]: Start difference. First operand 131 states and 166 transitions. Second operand has 7 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2022-07-21 16:45:29,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:45:29,463 INFO L93 Difference]: Finished difference Result 135 states and 176 transitions. [2022-07-21 16:45:29,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-07-21 16:45:29,464 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 35 [2022-07-21 16:45:29,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:45:29,465 INFO L225 Difference]: With dead ends: 135 [2022-07-21 16:45:29,465 INFO L226 Difference]: Without dead ends: 135 [2022-07-21 16:45:29,466 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 62 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 14.5s TimeCoverageRelationStatistics Valid=27, Invalid=61, Unknown=2, NotChecked=0, Total=90 [2022-07-21 16:45:29,471 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 44 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 86 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-21 16:45:29,472 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 112 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 171 Invalid, 0 Unknown, 86 Unchecked, 0.3s Time] [2022-07-21 16:45:29,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2022-07-21 16:45:29,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 131. [2022-07-21 16:45:29,479 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) [2022-07-21 16:45:29,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 166 transitions. [2022-07-21 16:45:29,481 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 166 transitions. Word has length 35 [2022-07-21 16:45:29,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:45:29,481 INFO L495 AbstractCegarLoop]: Abstraction has 131 states and 166 transitions. [2022-07-21 16:45:29,481 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2022-07-21 16:45:29,481 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 166 transitions. [2022-07-21 16:45:29,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-07-21 16:45:29,484 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:45:29,484 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1] [2022-07-21 16:45:29,490 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (20)] Forceful destruction successful, exit code 0 [2022-07-21 16:45:29,695 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Ended with exit code 0 [2022-07-21 16:45:29,887 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 16:45:29,887 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-07-21 16:45:29,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:45:29,888 INFO L85 PathProgramCache]: Analyzing trace with hash 1805515892, now seen corresponding path program 2 times [2022-07-21 16:45:29,888 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 16:45:29,888 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [251916829] [2022-07-21 16:45:29,888 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-21 16:45:29,889 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 16:45:29,889 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 16:45:29,889 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 16:45:29,890 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2022-07-21 16:45:30,083 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-21 16:45:30,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 16:45:30,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 17 conjunts are in the unsatisfiable core [2022-07-21 16:45:30,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:45:30,098 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:45:34,334 INFO L356 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2022-07-21 16:45:34,334 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 21 treesize of output 37 [2022-07-21 16:45:34,403 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 41 proven. 27 refuted. 3 times theorem prover too weak. 19 trivial. 0 not checked. [2022-07-21 16:45:34,403 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:45:36,524 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 16:45:36,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [251916829] [2022-07-21 16:45:36,525 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [251916829] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:45:36,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1229104282] [2022-07-21 16:45:36,525 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-21 16:45:36,525 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-21 16:45:36,525 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-21 16:45:36,528 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) [2022-07-21 16:45:36,535 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2022-07-21 16:45:36,730 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-21 16:45:36,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1225453318] [2022-07-21 16:45:36,730 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-21 16:45:36,730 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 16:45:36,731 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 16:45:36,732 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) [2022-07-21 16:45:36,732 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (22)] Ended with exit code 1 [2022-07-21 16:45:36,740 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-07-21 16:45:36,921 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-21 16:45:36,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 16:45:36,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 17 conjunts are in the unsatisfiable core [2022-07-21 16:45:36,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:45:36,932 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:45:47,503 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-21 16:45:47,536 INFO L356 Elim1Store]: treesize reduction 24, result has 46.7 percent of original size [2022-07-21 16:45:47,537 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 29 [2022-07-21 16:45:47,557 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 41 proven. 27 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-07-21 16:45:47,557 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:45:47,768 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1225453318] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:45:47,768 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 16:45:47,768 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2022-07-21 16:45:47,769 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499517514] [2022-07-21 16:45:47,769 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 16:45:47,769 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-21 16:45:47,769 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 16:45:47,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-21 16:45:47,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=95, Unknown=6, NotChecked=0, Total=132 [2022-07-21 16:45:47,770 INFO L87 Difference]: Start difference. First operand 131 states and 166 transitions. Second operand has 10 states, 9 states have (on average 4.444444444444445) internal successors, (40), 9 states have internal predecessors, (40), 7 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2022-07-21 16:46:00,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:46:00,171 INFO L93 Difference]: Finished difference Result 169 states and 224 transitions. [2022-07-21 16:46:00,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-21 16:46:00,172 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 4.444444444444445) internal successors, (40), 9 states have internal predecessors, (40), 7 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) Word has length 49 [2022-07-21 16:46:00,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:46:00,173 INFO L225 Difference]: With dead ends: 169 [2022-07-21 16:46:00,173 INFO L226 Difference]: Without dead ends: 169 [2022-07-21 16:46:00,173 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 90 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 28.8s TimeCoverageRelationStatistics Valid=58, Invalid=143, Unknown=9, NotChecked=0, Total=210 [2022-07-21 16:46:00,174 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 48 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 495 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 400 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 16:46:00,174 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 170 Invalid, 495 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 87 Invalid, 0 Unknown, 400 Unchecked, 0.2s Time] [2022-07-21 16:46:00,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2022-07-21 16:46:00,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 168. [2022-07-21 16:46:00,180 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, (54), 28 states have call predecessors, (54), 23 states have call successors, (54) [2022-07-21 16:46:00,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 224 transitions. [2022-07-21 16:46:00,182 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 224 transitions. Word has length 49 [2022-07-21 16:46:00,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:46:00,182 INFO L495 AbstractCegarLoop]: Abstraction has 168 states and 224 transitions. [2022-07-21 16:46:00,182 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 4.444444444444445) internal successors, (40), 9 states have internal predecessors, (40), 7 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2022-07-21 16:46:00,182 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 224 transitions. [2022-07-21 16:46:00,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-07-21 16:46:00,183 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:46:00,183 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1] [2022-07-21 16:46:00,196 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2022-07-21 16:46:00,410 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-07-21 16:46:00,593 WARN L477 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 [2022-07-21 16:46:00,593 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting nondet_treeErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-07-21 16:46:00,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:46:00,594 INFO L85 PathProgramCache]: Analyzing trace with hash 1805515893, now seen corresponding path program 2 times [2022-07-21 16:46:00,594 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 16:46:00,594 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1349057644] [2022-07-21 16:46:00,594 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-21 16:46:00,594 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 16:46:00,594 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 16:46:00,595 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) [2022-07-21 16:46:00,596 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2022-07-21 16:46:00,787 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-21 16:46:00,787 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 16:46:00,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 22 conjunts are in the unsatisfiable core [2022-07-21 16:46:00,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:46:00,804 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:46:00,811 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:46:03,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 16:46:03,107 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-07-21 16:46:03,108 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2022-07-21 16:46:03,120 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-21 16:46:03,121 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 12 [2022-07-21 16:46:03,165 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 41 proven. 34 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-07-21 16:46:03,165 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:46:05,398 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1135 (_ BitVec 32)) (v_nondet_tree_~n~0.base_87 (_ BitVec 32)) (v_nondet_tree_~n~0.base_86 (_ BitVec 32))) (or (let ((.cse0 (bvadd (_ bv8 32) c_nondet_tree_~n~0.offset))) (and (bvule .cse0 (select (store (store |c_#length| v_nondet_tree_~n~0.base_86 v_ArrVal_1135) v_nondet_tree_~n~0.base_87 (_ bv12 32)) c_nondet_tree_~n~0.base)) (bvule (bvadd (_ bv4 32) c_nondet_tree_~n~0.offset) .cse0))) (not (= (_ bv0 1) (bvneg (select |c_#valid| v_nondet_tree_~n~0.base_86)))))) is different from false [2022-07-21 16:46:05,404 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 16:46:05,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1349057644] [2022-07-21 16:46:05,404 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1349057644] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:46:05,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1627440114] [2022-07-21 16:46:05,404 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-21 16:46:05,404 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-21 16:46:05,404 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-21 16:46:05,405 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) [2022-07-21 16:46:05,406 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2022-07-21 16:46:05,696 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-21 16:46:05,696 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 16:46:05,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 22 conjunts are in the unsatisfiable core [2022-07-21 16:46:05,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:46:05,715 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:46:05,723 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:46:07,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 16:46:07,999 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-07-21 16:46:07,999 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2022-07-21 16:46:08,018 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-21 16:46:08,018 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 12 [2022-07-21 16:46:08,066 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 41 proven. 34 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-07-21 16:46:08,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:46:15,606 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1627440114] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:46:15,607 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 16:46:15,607 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2022-07-21 16:46:15,607 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699073798] [2022-07-21 16:46:15,607 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 16:46:15,607 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-07-21 16:46:15,607 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 16:46:15,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-07-21 16:46:15,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=83, Unknown=5, NotChecked=18, Total=132 [2022-07-21 16:46:15,608 INFO L87 Difference]: Start difference. First operand 168 states and 224 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) [2022-07-21 16:46:22,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:46:22,860 INFO L93 Difference]: Finished difference Result 210 states and 286 transitions. [2022-07-21 16:46:22,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-07-21 16:46:22,861 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 [2022-07-21 16:46:22,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:46:22,862 INFO L225 Difference]: With dead ends: 210 [2022-07-21 16:46:22,863 INFO L226 Difference]: Without dead ends: 210 [2022-07-21 16:46:22,863 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 89 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 20.7s TimeCoverageRelationStatistics Valid=54, Invalid=125, Unknown=7, NotChecked=24, Total=210 [2022-07-21 16:46:22,863 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 46 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 399 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 231 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 16:46:22,864 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 159 Invalid, 399 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 156 Invalid, 0 Unknown, 231 Unchecked, 0.2s Time] [2022-07-21 16:46:22,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2022-07-21 16:46:22,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 210. [2022-07-21 16:46:22,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 141 states have (on average 1.2695035460992907) internal successors, (179), 159 states have internal predecessors, (179), 29 states have call successors, (29), 16 states have call predecessors, (29), 24 states have return successors, (78), 34 states have call predecessors, (78), 29 states have call successors, (78) [2022-07-21 16:46:22,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 286 transitions. [2022-07-21 16:46:22,873 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 286 transitions. Word has length 49 [2022-07-21 16:46:22,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:46:22,873 INFO L495 AbstractCegarLoop]: Abstraction has 210 states and 286 transitions. [2022-07-21 16:46:22,873 INFO L496 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) [2022-07-21 16:46:22,873 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 286 transitions. [2022-07-21 16:46:22,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-07-21 16:46:22,874 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:46:22,874 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 16:46:22,879 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2022-07-21 16:46:23,087 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2022-07-21 16:46:23,279 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 16:46:23,279 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-07-21 16:46:23,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:46:23,280 INFO L85 PathProgramCache]: Analyzing trace with hash 1738803102, now seen corresponding path program 2 times [2022-07-21 16:46:23,280 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 16:46:23,280 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [277849732] [2022-07-21 16:46:23,280 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-21 16:46:23,280 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 16:46:23,280 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 16:46:23,281 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 16:46:23,282 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2022-07-21 16:46:23,418 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-21 16:46:23,418 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 16:46:23,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 17 conjunts are in the unsatisfiable core [2022-07-21 16:46:23,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:46:23,580 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 21 proven. 5 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-07-21 16:46:23,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:46:24,214 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2022-07-21 16:46:24,384 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 21 proven. 5 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-07-21 16:46:24,384 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 16:46:24,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [277849732] [2022-07-21 16:46:24,384 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [277849732] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 16:46:24,384 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 16:46:24,384 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 17 [2022-07-21 16:46:24,384 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1078677317] [2022-07-21 16:46:24,384 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 16:46:24,385 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-07-21 16:46:24,385 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 16:46:24,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-07-21 16:46:24,385 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2022-07-21 16:46:24,386 INFO L87 Difference]: Start difference. First operand 210 states and 286 transitions. Second operand has 18 states, 15 states have (on average 2.6) internal successors, (39), 14 states have internal predecessors, (39), 7 states have call successors, (9), 5 states have call predecessors, (9), 5 states have return successors, (8), 7 states have call predecessors, (8), 5 states have call successors, (8) [2022-07-21 16:46:26,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:46:26,270 INFO L93 Difference]: Finished difference Result 215 states and 291 transitions. [2022-07-21 16:46:26,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-07-21 16:46:26,272 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 15 states have (on average 2.6) internal successors, (39), 14 states have internal predecessors, (39), 7 states have call successors, (9), 5 states have call predecessors, (9), 5 states have return successors, (8), 7 states have call predecessors, (8), 5 states have call successors, (8) Word has length 39 [2022-07-21 16:46:26,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:46:26,274 INFO L225 Difference]: With dead ends: 215 [2022-07-21 16:46:26,274 INFO L226 Difference]: Without dead ends: 215 [2022-07-21 16:46:26,274 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=78, Invalid=428, Unknown=0, NotChecked=0, Total=506 [2022-07-21 16:46:26,275 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 135 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 693 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 752 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 693 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 19 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-07-21 16:46:26,275 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [137 Valid, 160 Invalid, 752 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 693 Invalid, 0 Unknown, 19 Unchecked, 1.7s Time] [2022-07-21 16:46:26,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2022-07-21 16:46:26,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 210. [2022-07-21 16:46:26,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 141 states have (on average 1.2553191489361701) internal successors, (177), 159 states have internal predecessors, (177), 29 states have call successors, (29), 16 states have call predecessors, (29), 24 states have return successors, (78), 34 states have call predecessors, (78), 29 states have call successors, (78) [2022-07-21 16:46:26,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 284 transitions. [2022-07-21 16:46:26,283 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 284 transitions. Word has length 39 [2022-07-21 16:46:26,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:46:26,284 INFO L495 AbstractCegarLoop]: Abstraction has 210 states and 284 transitions. [2022-07-21 16:46:26,284 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 15 states have (on average 2.6) internal successors, (39), 14 states have internal predecessors, (39), 7 states have call successors, (9), 5 states have call predecessors, (9), 5 states have return successors, (8), 7 states have call predecessors, (8), 5 states have call successors, (8) [2022-07-21 16:46:26,284 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 284 transitions. [2022-07-21 16:46:26,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-07-21 16:46:26,285 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:46:26,285 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2022-07-21 16:46:26,297 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2022-07-21 16:46:26,495 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 16:46:26,495 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-07-21 16:46:26,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:46:26,496 INFO L85 PathProgramCache]: Analyzing trace with hash -1830162110, now seen corresponding path program 3 times [2022-07-21 16:46:26,496 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 16:46:26,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [773248537] [2022-07-21 16:46:26,496 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-21 16:46:26,496 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 16:46:26,496 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 16:46:26,497 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 16:46:26,500 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2022-07-21 16:46:26,693 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-07-21 16:46:26,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 16:46:26,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 18 conjunts are in the unsatisfiable core [2022-07-21 16:46:26,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:46:26,708 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:46:39,095 INFO L356 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2022-07-21 16:46:39,096 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 21 treesize of output 37 [2022-07-21 16:46:39,179 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 7 proven. 23 refuted. 5 times theorem prover too weak. 16 trivial. 0 not checked. [2022-07-21 16:46:39,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:46:41,370 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 16:46:41,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [773248537] [2022-07-21 16:46:41,370 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [773248537] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:46:41,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [226319136] [2022-07-21 16:46:41,370 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-21 16:46:41,370 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-21 16:46:41,371 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-21 16:46:41,372 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-07-21 16:46:41,373 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2022-07-21 16:46:41,637 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-21 16:46:41,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1923786346] [2022-07-21 16:46:41,637 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-21 16:46:41,637 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 16:46:41,637 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 16:46:41,639 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 16:46:41,640 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-07-21 16:46:41,642 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 1 [2022-07-21 16:46:42,161 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-07-21 16:46:42,161 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 16:46:42,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 16 conjunts are in the unsatisfiable core [2022-07-21 16:46:42,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:46:48,457 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-21 16:46:48,482 INFO L356 Elim1Store]: treesize reduction 24, result has 46.7 percent of original size [2022-07-21 16:46:48,482 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 29 [2022-07-21 16:46:48,497 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 7 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-07-21 16:46:48,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:46:48,912 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1923786346] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:46:48,912 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 16:46:48,912 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 11 [2022-07-21 16:46:48,912 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523746741] [2022-07-21 16:46:48,912 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 16:46:48,912 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-07-21 16:46:48,912 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 16:46:48,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-07-21 16:46:48,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=156, Unknown=8, NotChecked=0, Total=240 [2022-07-21 16:46:48,913 INFO L87 Difference]: Start difference. First operand 210 states and 284 transitions. Second operand has 12 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 11 states have internal predecessors, (37), 7 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (9), 7 states have call predecessors, (9), 6 states have call successors, (9) [2022-07-21 16:47:17,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:47:17,904 INFO L93 Difference]: Finished difference Result 216 states and 307 transitions. [2022-07-21 16:47:17,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-07-21 16:47:17,905 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 11 states have internal predecessors, (37), 7 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (9), 7 states have call predecessors, (9), 6 states have call successors, (9) Word has length 39 [2022-07-21 16:47:17,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:47:17,906 INFO L225 Difference]: With dead ends: 216 [2022-07-21 16:47:17,906 INFO L226 Difference]: Without dead ends: 216 [2022-07-21 16:47:17,907 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 64 SyntacticMatches, 12 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 49.5s TimeCoverageRelationStatistics Valid=99, Invalid=196, Unknown=11, NotChecked=0, Total=306 [2022-07-21 16:47:17,907 INFO L413 NwaCegarLoop]: 63 mSDtfsCounter, 60 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 345 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 240 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 16:47:17,907 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [64 Valid, 118 Invalid, 345 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 95 Invalid, 0 Unknown, 240 Unchecked, 0.2s Time] [2022-07-21 16:47:17,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2022-07-21 16:47:17,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 215. [2022-07-21 16:47:17,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 145 states have (on average 1.2551724137931035) internal successors, (182), 162 states have internal predecessors, (182), 29 states have call successors, (29), 16 states have call predecessors, (29), 25 states have return successors, (96), 36 states have call predecessors, (96), 29 states have call successors, (96) [2022-07-21 16:47:17,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 307 transitions. [2022-07-21 16:47:17,916 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 307 transitions. Word has length 39 [2022-07-21 16:47:17,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:47:17,916 INFO L495 AbstractCegarLoop]: Abstraction has 215 states and 307 transitions. [2022-07-21 16:47:17,917 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 11 states have internal predecessors, (37), 7 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (9), 7 states have call predecessors, (9), 6 states have call successors, (9) [2022-07-21 16:47:17,917 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 307 transitions. [2022-07-21 16:47:17,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-07-21 16:47:17,917 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:47:17,918 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2022-07-21 16:47:17,932 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2022-07-21 16:47:18,147 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2022-07-21 16:47:18,329 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 16:47:18,329 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting nondet_treeErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-07-21 16:47:18,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:47:18,330 INFO L85 PathProgramCache]: Analyzing trace with hash -556103673, now seen corresponding path program 3 times [2022-07-21 16:47:18,330 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 16:47:18,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1741158546] [2022-07-21 16:47:18,330 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-21 16:47:18,330 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 16:47:18,330 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 16:47:18,331 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) [2022-07-21 16:47:18,332 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2022-07-21 16:47:18,619 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-07-21 16:47:18,619 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 16:47:18,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 23 conjunts are in the unsatisfiable core [2022-07-21 16:47:18,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:47:18,637 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:47:18,852 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-21 16:47:18,853 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 12 [2022-07-21 16:47:18,971 INFO L356 Elim1Store]: treesize reduction 31, result has 13.9 percent of original size [2022-07-21 16:47:18,971 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 19 [2022-07-21 16:47:19,031 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 21 proven. 32 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-07-21 16:47:19,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:47:19,283 INFO L356 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-07-21 16:47:19,283 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 17 [2022-07-21 16:47:19,465 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 16:47:19,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1741158546] [2022-07-21 16:47:19,466 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1741158546] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:47:19,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [821259646] [2022-07-21 16:47:19,466 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-21 16:47:19,466 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-21 16:47:19,466 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-21 16:47:19,467 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-07-21 16:47:19,468 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (31)] Waiting until timeout for monitored process [2022-07-21 16:47:19,853 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-07-21 16:47:19,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 16:47:19,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 31 conjunts are in the unsatisfiable core [2022-07-21 16:47:19,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:47:19,865 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:47:19,872 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:47:39,064 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 16:47:39,065 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 16:47:39,066 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 16:47:39,067 INFO L390 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 [2022-07-21 16:47:39,090 INFO L356 Elim1Store]: treesize reduction 16, result has 36.0 percent of original size [2022-07-21 16:47:39,090 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 22 treesize of output 24 [2022-07-21 16:47:39,098 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 19 proven. 40 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-07-21 16:47:39,098 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:47:44,087 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [821259646] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:47:44,087 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 16:47:44,087 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 17 [2022-07-21 16:47:44,087 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359204507] [2022-07-21 16:47:44,087 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 16:47:44,088 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-07-21 16:47:44,088 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 16:47:44,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-07-21 16:47:44,088 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=355, Unknown=11, NotChecked=0, Total=420 [2022-07-21 16:47:44,088 INFO L87 Difference]: Start difference. First operand 215 states and 307 transitions. Second operand has 18 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 16 states have internal predecessors, (49), 9 states have call successors, (12), 3 states have call predecessors, (12), 6 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2022-07-21 16:48:07,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:48:07,404 INFO L93 Difference]: Finished difference Result 215 states and 306 transitions. [2022-07-21 16:48:07,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-07-21 16:48:07,405 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 16 states have internal predecessors, (49), 9 states have call successors, (12), 3 states have call predecessors, (12), 6 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) Word has length 43 [2022-07-21 16:48:07,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:48:07,407 INFO L225 Difference]: With dead ends: 215 [2022-07-21 16:48:07,407 INFO L226 Difference]: Without dead ends: 215 [2022-07-21 16:48:07,407 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 70 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 47.0s TimeCoverageRelationStatistics Valid=113, Invalid=680, Unknown=19, NotChecked=0, Total=812 [2022-07-21 16:48:07,408 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 44 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 581 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 418 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-21 16:48:07,408 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 165 Invalid, 581 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 154 Invalid, 0 Unknown, 418 Unchecked, 0.3s Time] [2022-07-21 16:48:07,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2022-07-21 16:48:07,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 214. [2022-07-21 16:48:07,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 144 states have (on average 1.25) internal successors, (180), 162 states have internal predecessors, (180), 29 states have call successors, (29), 16 states have call predecessors, (29), 25 states have return successors, (96), 35 states have call predecessors, (96), 29 states have call successors, (96) [2022-07-21 16:48:07,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 305 transitions. [2022-07-21 16:48:07,415 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 305 transitions. Word has length 43 [2022-07-21 16:48:07,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:48:07,415 INFO L495 AbstractCegarLoop]: Abstraction has 214 states and 305 transitions. [2022-07-21 16:48:07,415 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 16 states have internal predecessors, (49), 9 states have call successors, (12), 3 states have call predecessors, (12), 6 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2022-07-21 16:48:07,415 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 305 transitions. [2022-07-21 16:48:07,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-07-21 16:48:07,416 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:48:07,416 INFO L195 NwaCegarLoop]: trace histogram [8, 6, 6, 6, 6, 6, 5, 5, 5, 5, 3, 2, 2, 1, 1, 1, 1] [2022-07-21 16:48:07,430 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (30)] Forceful destruction successful, exit code 0 [2022-07-21 16:48:07,621 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (31)] Forceful destruction successful, exit code 0 [2022-07-21 16:48:07,817 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2022-07-21 16:48:07,817 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting nondet_treeErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-07-21 16:48:07,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:48:07,818 INFO L85 PathProgramCache]: Analyzing trace with hash -1915391076, now seen corresponding path program 2 times [2022-07-21 16:48:07,818 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 16:48:07,818 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1784490653] [2022-07-21 16:48:07,818 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-21 16:48:07,818 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 16:48:07,818 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 16:48:07,819 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 16:48:07,820 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2022-07-21 16:48:08,188 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-21 16:48:08,188 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 16:48:08,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 25 conjunts are in the unsatisfiable core [2022-07-21 16:48:08,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:48:08,215 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:48:08,221 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:48:12,493 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 16:48:12,521 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-07-21 16:48:12,522 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2022-07-21 16:48:12,537 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-21 16:48:12,538 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 12 [2022-07-21 16:48:12,625 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 105 proven. 45 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-07-21 16:48:12,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:48:15,389 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 16:48:15,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1784490653] [2022-07-21 16:48:15,389 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1784490653] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:48:15,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1259568380] [2022-07-21 16:48:15,390 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-21 16:48:15,390 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-21 16:48:15,390 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-21 16:48:15,391 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-07-21 16:48:15,391 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2022-07-21 16:48:15,769 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-21 16:48:15,769 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 16:48:15,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 25 conjunts are in the unsatisfiable core [2022-07-21 16:48:15,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:48:15,782 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:48:15,787 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:48:17,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 16:48:18,026 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-07-21 16:48:18,027 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2022-07-21 16:48:18,042 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-21 16:48:18,042 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 12 [2022-07-21 16:48:18,091 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 105 proven. 45 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-07-21 16:48:18,091 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:48:21,905 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1259568380] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:48:21,905 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 16:48:21,905 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2022-07-21 16:48:21,906 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923243449] [2022-07-21 16:48:21,906 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 16:48:21,906 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-07-21 16:48:21,906 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 16:48:21,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-07-21 16:48:21,907 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=120, Unknown=3, NotChecked=0, Total=156 [2022-07-21 16:48:21,907 INFO L87 Difference]: Start difference. First operand 214 states and 305 transitions. Second operand has 9 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 6 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (7), 4 states have call predecessors, (7), 6 states have call successors, (7) [2022-07-21 16:48:26,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:48:26,234 INFO L93 Difference]: Finished difference Result 231 states and 335 transitions. [2022-07-21 16:48:26,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-21 16:48:26,235 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 6 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (7), 4 states have call predecessors, (7), 6 states have call successors, (7) Word has length 69 [2022-07-21 16:48:26,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:48:26,236 INFO L225 Difference]: With dead ends: 231 [2022-07-21 16:48:26,236 INFO L226 Difference]: Without dead ends: 231 [2022-07-21 16:48:26,237 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 139 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 16.1s TimeCoverageRelationStatistics Valid=51, Invalid=154, Unknown=5, NotChecked=0, Total=210 [2022-07-21 16:48:26,237 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 44 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 159 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 158 SdHoareTripleChecker+Invalid, 411 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 241 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 16:48:26,237 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 158 Invalid, 411 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 159 Invalid, 0 Unknown, 241 Unchecked, 0.2s Time] [2022-07-21 16:48:26,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2022-07-21 16:48:26,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 230. [2022-07-21 16:48:26,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 155 states have (on average 1.238709677419355) internal successors, (192), 174 states have internal predecessors, (192), 32 states have call successors, (32), 17 states have call predecessors, (32), 27 states have return successors, (110), 38 states have call predecessors, (110), 32 states have call successors, (110) [2022-07-21 16:48:26,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 334 transitions. [2022-07-21 16:48:26,246 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 334 transitions. Word has length 69 [2022-07-21 16:48:26,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:48:26,247 INFO L495 AbstractCegarLoop]: Abstraction has 230 states and 334 transitions. [2022-07-21 16:48:26,247 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 6 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (7), 4 states have call predecessors, (7), 6 states have call successors, (7) [2022-07-21 16:48:26,247 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 334 transitions. [2022-07-21 16:48:26,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-07-21 16:48:26,248 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:48:26,248 INFO L195 NwaCegarLoop]: 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] [2022-07-21 16:48:26,267 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2022-07-21 16:48:26,468 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (33)] Forceful destruction successful, exit code 0 [2022-07-21 16:48:26,663 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2022-07-21 16:48:26,664 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-07-21 16:48:26,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:48:26,664 INFO L85 PathProgramCache]: Analyzing trace with hash -612022781, now seen corresponding path program 1 times [2022-07-21 16:48:26,664 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 16:48:26,664 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [416433614] [2022-07-21 16:48:26,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 16:48:26,664 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 16:48:26,664 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 16:48:26,665 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 16:48:26,666 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2022-07-21 16:48:26,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 16:48:26,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 29 conjunts are in the unsatisfiable core [2022-07-21 16:48:26,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:48:26,839 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-07-21 16:48:26,846 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-07-21 16:48:27,151 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2022-07-21 16:48:27,155 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2022-07-21 16:48:27,256 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-07-21 16:48:27,256 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:48:27,542 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-07-21 16:48:27,543 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 16:48:27,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [416433614] [2022-07-21 16:48:27,543 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [416433614] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 16:48:27,543 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 16:48:27,543 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 14 [2022-07-21 16:48:27,544 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119882362] [2022-07-21 16:48:27,544 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 16:48:27,544 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-07-21 16:48:27,544 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 16:48:27,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-07-21 16:48:27,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2022-07-21 16:48:27,545 INFO L87 Difference]: Start difference. First operand 230 states and 334 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) [2022-07-21 16:48:28,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:48:28,239 INFO L93 Difference]: Finished difference Result 271 states and 400 transitions. [2022-07-21 16:48:28,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-07-21 16:48:28,241 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 [2022-07-21 16:48:28,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:48:28,242 INFO L225 Difference]: With dead ends: 271 [2022-07-21 16:48:28,243 INFO L226 Difference]: Without dead ends: 271 [2022-07-21 16:48:28,243 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=60, Invalid=320, Unknown=0, NotChecked=0, Total=380 [2022-07-21 16:48:28,243 INFO L413 NwaCegarLoop]: 79 mSDtfsCounter, 35 mSDsluCounter, 802 mSDsCounter, 0 mSdLazyCounter, 255 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 881 SdHoareTripleChecker+Invalid, 298 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 255 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 36 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-07-21 16:48:28,243 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 881 Invalid, 298 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 255 Invalid, 0 Unknown, 36 Unchecked, 0.5s Time] [2022-07-21 16:48:28,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2022-07-21 16:48:28,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 261. [2022-07-21 16:48:28,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 178 states have (on average 1.247191011235955) internal successors, (222), 199 states have internal predecessors, (222), 36 states have call successors, (36), 20 states have call predecessors, (36), 31 states have return successors, (137), 41 states have call predecessors, (137), 36 states have call successors, (137) [2022-07-21 16:48:28,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 395 transitions. [2022-07-21 16:48:28,254 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 395 transitions. Word has length 38 [2022-07-21 16:48:28,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:48:28,254 INFO L495 AbstractCegarLoop]: Abstraction has 261 states and 395 transitions. [2022-07-21 16:48:28,254 INFO L496 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) [2022-07-21 16:48:28,254 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 395 transitions. [2022-07-21 16:48:28,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-07-21 16:48:28,256 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:48:28,256 INFO L195 NwaCegarLoop]: trace histogram [8, 6, 6, 6, 6, 6, 5, 5, 5, 5, 3, 2, 2, 1, 1, 1, 1] [2022-07-21 16:48:28,267 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (34)] Forceful destruction successful, exit code 0 [2022-07-21 16:48:28,465 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 16:48:28,465 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting nondet_treeErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-07-21 16:48:28,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:48:28,465 INFO L85 PathProgramCache]: Analyzing trace with hash 1426263835, now seen corresponding path program 2 times [2022-07-21 16:48:28,466 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 16:48:28,466 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2103372072] [2022-07-21 16:48:28,466 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-21 16:48:28,466 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 16:48:28,466 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 16:48:28,467 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) [2022-07-21 16:48:28,468 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2022-07-21 16:48:28,808 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-21 16:48:28,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 16:48:28,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 15 conjunts are in the unsatisfiable core [2022-07-21 16:48:28,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:48:28,838 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-21 16:48:29,018 INFO L356 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-07-21 16:48:29,018 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 18 treesize of output 25 [2022-07-21 16:48:29,032 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 95 proven. 15 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-07-21 16:48:29,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:48:29,166 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 16:48:29,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2103372072] [2022-07-21 16:48:29,166 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2103372072] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:48:29,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1302138082] [2022-07-21 16:48:29,166 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-21 16:48:29,166 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-21 16:48:29,166 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-21 16:48:29,167 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) [2022-07-21 16:48:29,168 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2022-07-21 16:48:29,515 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-21 16:48:29,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2072103094] [2022-07-21 16:48:29,515 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-21 16:48:29,515 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 16:48:29,515 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 16:48:29,517 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) [2022-07-21 16:48:29,518 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-07-21 16:48:29,521 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (36)] Forceful destruction successful, exit code 1 [2022-07-21 16:48:29,724 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-21 16:48:29,725 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 16:48:29,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 10 conjunts are in the unsatisfiable core [2022-07-21 16:48:29,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:48:33,868 INFO L356 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2022-07-21 16:48:33,868 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 17 [2022-07-21 16:48:33,884 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 91 proven. 7 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2022-07-21 16:48:33,885 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:48:34,013 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2072103094] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:48:34,013 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 16:48:34,013 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 6 [2022-07-21 16:48:34,013 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678506243] [2022-07-21 16:48:34,014 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 16:48:34,014 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-07-21 16:48:34,014 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 16:48:34,014 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-07-21 16:48:34,014 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=38, Unknown=1, NotChecked=0, Total=56 [2022-07-21 16:48:34,014 INFO L87 Difference]: Start difference. First operand 261 states and 395 transitions. Second operand has 7 states, 6 states have (on average 5.333333333333333) internal successors, (32), 7 states have internal predecessors, (32), 5 states have call successors, (10), 2 states have call predecessors, (10), 4 states have return successors, (10), 5 states have call predecessors, (10), 5 states have call successors, (10) [2022-07-21 16:48:42,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 16:48:42,312 INFO L93 Difference]: Finished difference Result 263 states and 397 transitions. [2022-07-21 16:48:42,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-07-21 16:48:42,312 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 5.333333333333333) internal successors, (32), 7 states have internal predecessors, (32), 5 states have call successors, (10), 2 states have call predecessors, (10), 4 states have return successors, (10), 5 states have call predecessors, (10), 5 states have call successors, (10) Word has length 69 [2022-07-21 16:48:42,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 16:48:42,313 INFO L225 Difference]: With dead ends: 263 [2022-07-21 16:48:42,313 INFO L226 Difference]: Without dead ends: 263 [2022-07-21 16:48:42,314 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 136 SyntacticMatches, 8 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=44, Invalid=86, Unknown=2, NotChecked=0, Total=132 [2022-07-21 16:48:42,314 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 46 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 282 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 179 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 16:48:42,314 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 104 Invalid, 282 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 93 Invalid, 0 Unknown, 179 Unchecked, 0.2s Time] [2022-07-21 16:48:42,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2022-07-21 16:48:42,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 262. [2022-07-21 16:48:42,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 179 states have (on average 1.2513966480446927) internal successors, (224), 199 states have internal predecessors, (224), 36 states have call successors, (36), 20 states have call predecessors, (36), 31 states have return successors, (137), 42 states have call predecessors, (137), 36 states have call successors, (137) [2022-07-21 16:48:42,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 397 transitions. [2022-07-21 16:48:42,324 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 397 transitions. Word has length 69 [2022-07-21 16:48:42,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 16:48:42,324 INFO L495 AbstractCegarLoop]: Abstraction has 262 states and 397 transitions. [2022-07-21 16:48:42,324 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 5.333333333333333) internal successors, (32), 7 states have internal predecessors, (32), 5 states have call successors, (10), 2 states have call predecessors, (10), 4 states have return successors, (10), 5 states have call predecessors, (10), 5 states have call successors, (10) [2022-07-21 16:48:42,325 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 397 transitions. [2022-07-21 16:48:42,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-07-21 16:48:42,325 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 16:48:42,325 INFO L195 NwaCegarLoop]: trace histogram [7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 1, 1, 1, 1] [2022-07-21 16:48:42,341 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2022-07-21 16:48:42,556 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-07-21 16:48:42,738 WARN L477 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 [2022-07-21 16:48:42,738 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting nondet_treeErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-07-21 16:48:42,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 16:48:42,738 INFO L85 PathProgramCache]: Analyzing trace with hash 917383077, now seen corresponding path program 3 times [2022-07-21 16:48:42,738 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 16:48:42,739 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [652404124] [2022-07-21 16:48:42,739 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-21 16:48:42,739 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 16:48:42,739 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 16:48:42,740 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) [2022-07-21 16:48:42,741 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2022-07-21 16:48:43,046 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-07-21 16:48:43,046 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 16:48:43,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 16 conjunts are in the unsatisfiable core [2022-07-21 16:48:43,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:48:51,408 INFO L356 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2022-07-21 16:48:51,409 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 21 treesize of output 37 [2022-07-21 16:48:51,492 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 62 proven. 23 refuted. 5 times theorem prover too weak. 28 trivial. 0 not checked. [2022-07-21 16:48:51,493 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:48:53,686 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 16:48:53,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [652404124] [2022-07-21 16:48:53,686 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [652404124] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:48:53,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [815253816] [2022-07-21 16:48:53,687 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-21 16:48:53,687 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-21 16:48:53,687 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-21 16:48:53,688 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) [2022-07-21 16:48:53,691 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (39)] Waiting until timeout for monitored process [2022-07-21 16:48:54,092 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-07-21 16:48:54,092 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 16:48:54,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 19 conjunts are in the unsatisfiable core [2022-07-21 16:48:54,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 16:49:03,961 INFO L356 Elim1Store]: treesize reduction 34, result has 38.2 percent of original size [2022-07-21 16:49:03,961 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 29 [2022-07-21 16:49:03,985 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 52 proven. 31 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-07-21 16:49:03,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 16:49:04,345 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [815253816] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 16:49:04,345 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 16:49:04,345 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2022-07-21 16:49:04,345 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1741717990] [2022-07-21 16:49:04,345 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 16:49:04,346 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-21 16:49:04,346 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 16:49:04,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-21 16:49:04,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=125, Unknown=5, NotChecked=0, Total=182 [2022-07-21 16:49:04,346 INFO L87 Difference]: Start difference. First operand 262 states and 397 transitions. Second operand has 10 states, 9 states have (on average 4.111111111111111) internal successors, (37), 9 states have internal predecessors, (37), 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)