./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 ff03de63 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-dev-ff03de6 [2021-12-21 17:57:16,040 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-21 17:57:16,043 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-21 17:57:16,077 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-21 17:57:16,078 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-21 17:57:16,079 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-21 17:57:16,080 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-21 17:57:16,081 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-21 17:57:16,083 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-21 17:57:16,083 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-21 17:57:16,084 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-21 17:57:16,085 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-21 17:57:16,086 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-21 17:57:16,086 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-21 17:57:16,087 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-21 17:57:16,088 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-21 17:57:16,089 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-21 17:57:16,090 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-21 17:57:16,092 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-21 17:57:16,093 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-21 17:57:16,095 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-21 17:57:16,096 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-21 17:57:16,097 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-21 17:57:16,098 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-21 17:57:16,100 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-21 17:57:16,101 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-21 17:57:16,101 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-21 17:57:16,102 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-21 17:57:16,102 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-21 17:57:16,103 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-21 17:57:16,103 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-21 17:57:16,104 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-21 17:57:16,105 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-21 17:57:16,106 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-21 17:57:16,106 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-21 17:57:16,107 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-21 17:57:16,107 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-21 17:57:16,108 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-21 17:57:16,108 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-21 17:57:16,109 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-21 17:57:16,109 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-21 17:57:16,110 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-32bit-Automizer_Default.epf [2021-12-21 17:57:16,136 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-21 17:57:16,136 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-21 17:57:16,136 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-21 17:57:16,136 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-21 17:57:16,137 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-21 17:57:16,137 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-21 17:57:16,138 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-21 17:57:16,138 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-21 17:57:16,138 INFO L138 SettingsManager]: * Use SBE=true [2021-12-21 17:57:16,138 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-21 17:57:16,138 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-21 17:57:16,139 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-21 17:57:16,139 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-21 17:57:16,139 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-21 17:57:16,139 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-21 17:57:16,139 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-21 17:57:16,139 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-21 17:57:16,140 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-21 17:57:16,140 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-21 17:57:16,140 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-21 17:57:16,140 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-21 17:57:16,140 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-21 17:57:16,141 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-21 17:57:16,141 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-21 17:57:16,141 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 17:57:16,141 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-21 17:57:16,141 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-21 17:57:16,141 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-21 17:57:16,142 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-21 17:57:16,142 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-21 17:57:16,142 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e98a60ea9ee0c00575c08606ce8b95d0660c5b235c5932147dfee4b13512f57c [2021-12-21 17:57:16,366 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-21 17:57:16,388 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-21 17:57:16,392 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-21 17:57:16,395 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-21 17:57:16,396 INFO L275 PluginConnector]: CDTParser initialized [2021-12-21 17:57:16,397 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/verifythis/tree_max.c [2021-12-21 17:57:16,459 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b753e0a4f/2f9fba77e91c4961a90313e5ecdea491/FLAG8d18abccb [2021-12-21 17:57:16,814 INFO L306 CDTParser]: Found 1 translation units. [2021-12-21 17:57:16,814 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_max.c [2021-12-21 17:57:16,824 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b753e0a4f/2f9fba77e91c4961a90313e5ecdea491/FLAG8d18abccb [2021-12-21 17:57:16,836 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b753e0a4f/2f9fba77e91c4961a90313e5ecdea491 [2021-12-21 17:57:16,839 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-21 17:57:16,840 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-21 17:57:16,842 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-21 17:57:16,842 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-21 17:57:16,845 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-21 17:57:16,845 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 05:57:16" (1/1) ... [2021-12-21 17:57:16,846 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@225d91d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:16, skipping insertion in model container [2021-12-21 17:57:16,846 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 05:57:16" (1/1) ... [2021-12-21 17:57:16,852 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-21 17:57:16,863 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-21 17:57:16,998 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_max.c[544,557] [2021-12-21 17:57:17,013 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 17:57:17,022 ERROR L326 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2021-12-21 17:57:17,022 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@796502e3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:17, skipping insertion in model container [2021-12-21 17:57:17,022 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-21 17:57:17,023 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-12-21 17:57:17,025 INFO L158 Benchmark]: Toolchain (without parser) took 183.49ms. Allocated memory is still 98.6MB. Free memory was 68.6MB in the beginning and 74.4MB in the end (delta: -5.8MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-12-21 17:57:17,025 INFO L158 Benchmark]: CDTParser took 0.24ms. Allocated memory is still 98.6MB. Free memory is still 55.5MB. There was no memory consumed. Max. memory is 16.1GB. [2021-12-21 17:57:17,026 INFO L158 Benchmark]: CACSL2BoogieTranslator took 181.10ms. Allocated memory is still 98.6MB. Free memory was 68.6MB in the beginning and 74.4MB in the end (delta: -5.8MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-12-21 17:57:17,027 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24ms. Allocated memory is still 98.6MB. Free memory is still 55.5MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 181.10ms. Allocated memory is still 98.6MB. Free memory was 68.6MB in the beginning and 74.4MB in the end (delta: -5.8MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 27]: Unsupported Syntax Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/verifythis/tree_max.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-memcleanup) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash e98a60ea9ee0c00575c08606ce8b95d0660c5b235c5932147dfee4b13512f57c --- Real Ultimate output --- This is Ultimate 0.2.2-dev-ff03de6 [2021-12-21 17:57:18,737 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-21 17:57:18,740 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-21 17:57:18,778 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-21 17:57:18,779 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-21 17:57:18,782 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-21 17:57:18,783 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-21 17:57:18,787 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-21 17:57:18,790 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-21 17:57:18,794 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-21 17:57:18,795 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-21 17:57:18,798 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-21 17:57:18,799 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-21 17:57:18,801 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-21 17:57:18,802 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-21 17:57:18,804 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-21 17:57:18,805 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-21 17:57:18,806 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-21 17:57:18,808 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-21 17:57:18,813 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-21 17:57:18,814 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-21 17:57:18,815 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-21 17:57:18,816 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-21 17:57:18,818 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-21 17:57:18,823 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-21 17:57:18,824 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-21 17:57:18,824 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-21 17:57:18,825 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-21 17:57:18,826 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-21 17:57:18,826 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-21 17:57:18,827 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-21 17:57:18,827 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-21 17:57:18,828 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-21 17:57:18,829 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-21 17:57:18,830 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-21 17:57:18,830 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-21 17:57:18,831 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-21 17:57:18,831 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-21 17:57:18,832 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-21 17:57:18,833 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-21 17:57:18,833 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-21 17:57:18,834 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-32bit-Automizer_Bitvector.epf [2021-12-21 17:57:18,870 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-21 17:57:18,871 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-21 17:57:18,872 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-21 17:57:18,872 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-21 17:57:18,873 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-21 17:57:18,873 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-21 17:57:18,874 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-21 17:57:18,875 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-21 17:57:18,875 INFO L138 SettingsManager]: * Use SBE=true [2021-12-21 17:57:18,875 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-21 17:57:18,876 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-21 17:57:18,876 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-21 17:57:18,876 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-21 17:57:18,876 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-21 17:57:18,876 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-21 17:57:18,877 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-21 17:57:18,877 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-21 17:57:18,877 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-21 17:57:18,877 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-21 17:57:18,877 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-12-21 17:57:18,878 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-12-21 17:57:18,878 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-21 17:57:18,878 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-21 17:57:18,878 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-21 17:57:18,878 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-21 17:57:18,884 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-21 17:57:18,884 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 17:57:18,885 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-21 17:57:18,885 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-21 17:57:18,885 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2021-12-21 17:57:18,885 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-12-21 17:57:18,885 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-21 17:57:18,886 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-12-21 17:57:18,886 INFO L138 SettingsManager]: * Logic for external solver=AUFBV WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e98a60ea9ee0c00575c08606ce8b95d0660c5b235c5932147dfee4b13512f57c [2021-12-21 17:57:19,193 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-21 17:57:19,211 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-21 17:57:19,213 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-21 17:57:19,214 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-21 17:57:19,215 INFO L275 PluginConnector]: CDTParser initialized [2021-12-21 17:57:19,216 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/verifythis/tree_max.c [2021-12-21 17:57:19,276 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0f1957913/149dcf982b14426a881d75216182e998/FLAG79e9277e9 [2021-12-21 17:57:19,727 INFO L306 CDTParser]: Found 1 translation units. [2021-12-21 17:57:19,727 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_max.c [2021-12-21 17:57:19,734 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0f1957913/149dcf982b14426a881d75216182e998/FLAG79e9277e9 [2021-12-21 17:57:20,128 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0f1957913/149dcf982b14426a881d75216182e998 [2021-12-21 17:57:20,132 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-21 17:57:20,133 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-21 17:57:20,136 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-21 17:57:20,137 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-21 17:57:20,142 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-21 17:57:20,143 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 05:57:20" (1/1) ... [2021-12-21 17:57:20,144 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@527850e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:20, skipping insertion in model container [2021-12-21 17:57:20,144 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 05:57:20" (1/1) ... [2021-12-21 17:57:20,150 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-21 17:57:20,163 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-21 17:57:20,334 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_max.c[544,557] [2021-12-21 17:57:20,356 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 17:57:20,374 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-12-21 17:57:20,382 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-21 17:57:20,397 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_max.c[544,557] [2021-12-21 17:57:20,411 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 17:57:20,428 INFO L203 MainTranslator]: Completed pre-run [2021-12-21 17:57:20,442 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_max.c[544,557] [2021-12-21 17:57:20,448 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 17:57:20,461 INFO L208 MainTranslator]: Completed translation [2021-12-21 17:57:20,462 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:20 WrapperNode [2021-12-21 17:57:20,462 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-21 17:57:20,463 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-21 17:57:20,463 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-21 17:57:20,463 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-21 17:57:20,469 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:20" (1/1) ... [2021-12-21 17:57:20,477 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:20" (1/1) ... [2021-12-21 17:57:20,491 INFO L137 Inliner]: procedures = 26, calls = 28, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 37 [2021-12-21 17:57:20,491 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-21 17:57:20,492 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-21 17:57:20,492 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-21 17:57:20,492 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-21 17:57:20,499 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:20" (1/1) ... [2021-12-21 17:57:20,499 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:20" (1/1) ... [2021-12-21 17:57:20,502 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:20" (1/1) ... [2021-12-21 17:57:20,502 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:20" (1/1) ... [2021-12-21 17:57:20,509 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:20" (1/1) ... [2021-12-21 17:57:20,510 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:20" (1/1) ... [2021-12-21 17:57:20,512 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:20" (1/1) ... [2021-12-21 17:57:20,514 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-21 17:57:20,515 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-21 17:57:20,515 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-21 17:57:20,515 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-21 17:57:20,516 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:20" (1/1) ... [2021-12-21 17:57:20,521 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 17:57:20,531 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 17:57:20,542 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-21 17:57:20,569 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-21 17:57:20,583 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-21 17:57:20,584 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-12-21 17:57:20,584 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-12-21 17:57:20,584 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-12-21 17:57:20,584 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-12-21 17:57:20,584 INFO L130 BoogieDeclarations]: Found specification of procedure max [2021-12-21 17:57:20,585 INFO L138 BoogieDeclarations]: Found implementation of procedure max [2021-12-21 17:57:20,585 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2021-12-21 17:57:20,585 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2021-12-21 17:57:20,585 INFO L130 BoogieDeclarations]: Found specification of procedure check [2021-12-21 17:57:20,585 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2021-12-21 17:57:20,586 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-21 17:57:20,586 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-21 17:57:20,586 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-21 17:57:20,586 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-12-21 17:57:20,682 INFO L234 CfgBuilder]: Building ICFG [2021-12-21 17:57:20,684 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-21 17:57:21,022 INFO L275 CfgBuilder]: Performing block encoding [2021-12-21 17:57:21,029 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-21 17:57:21,029 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-12-21 17:57:21,031 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 05:57:21 BoogieIcfgContainer [2021-12-21 17:57:21,031 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-21 17:57:21,032 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-21 17:57:21,032 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-21 17:57:21,035 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-21 17:57:21,035 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 05:57:20" (1/3) ... [2021-12-21 17:57:21,036 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69ef9efa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 05:57:21, skipping insertion in model container [2021-12-21 17:57:21,036 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:20" (2/3) ... [2021-12-21 17:57:21,036 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69ef9efa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 05:57:21, skipping insertion in model container [2021-12-21 17:57:21,036 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 05:57:21" (3/3) ... [2021-12-21 17:57:21,037 INFO L111 eAbstractionObserver]: Analyzing ICFG tree_max.c [2021-12-21 17:57:21,042 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-21 17:57:21,042 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 20 error locations. [2021-12-21 17:57:21,079 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-21 17:57:21,087 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-21 17:57:21,088 INFO L340 AbstractCegarLoop]: Starting to check reachability of 20 error locations. [2021-12-21 17:57:21,107 INFO L276 IsEmpty]: Start isEmpty. Operand has 72 states, 39 states have (on average 1.6923076923076923) internal successors, (66), 59 states have internal predecessors, (66), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-21 17:57:21,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-12-21 17:57:21,117 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:21,118 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-12-21 17:57:21,118 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting nondet_treeErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-21 17:57:21,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:57:21,126 INFO L85 PathProgramCache]: Analyzing trace with hash 73597257, now seen corresponding path program 1 times [2021-12-21 17:57:21,135 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:57:21,136 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [692524367] [2021-12-21 17:57:21,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:21,136 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:57:21,137 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:57:21,139 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:57:21,140 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-12-21 17:57:21,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:21,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-21 17:57:21,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:21,326 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:57:21,336 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 17:57:21,337 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 17:57:21,337 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:57:21,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [692524367] [2021-12-21 17:57:21,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [692524367] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 17:57:21,339 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 17:57:21,339 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-21 17:57:21,340 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [363546805] [2021-12-21 17:57:21,341 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 17:57:21,344 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-21 17:57:21,345 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:57:21,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-21 17:57:21,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-21 17:57:21,373 INFO L87 Difference]: Start difference. First operand has 72 states, 39 states have (on average 1.6923076923076923) internal successors, (66), 59 states have internal predecessors, (66), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 17:57:21,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:57:21,503 INFO L93 Difference]: Finished difference Result 73 states and 86 transitions. [2021-12-21 17:57:21,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-21 17:57:21,506 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-12-21 17:57:21,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:57:21,520 INFO L225 Difference]: With dead ends: 73 [2021-12-21 17:57:21,521 INFO L226 Difference]: Without dead ends: 71 [2021-12-21 17:57:21,522 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-21 17:57:21,527 INFO L933 BasicCegarLoop]: 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 [2021-12-21 17:57:21,528 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 133 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 17:57:21,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-12-21 17:57:21,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 69. [2021-12-21 17:57:21,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 38 states have (on average 1.631578947368421) internal successors, (62), 56 states have internal predecessors, (62), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-21 17:57:21,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 80 transitions. [2021-12-21 17:57:21,578 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 80 transitions. Word has length 5 [2021-12-21 17:57:21,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:57:21,578 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 80 transitions. [2021-12-21 17:57:21,579 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 17:57:21,579 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 80 transitions. [2021-12-21 17:57:21,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-12-21 17:57:21,582 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:21,582 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-12-21 17:57:21,596 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Ended with exit code 0 [2021-12-21 17:57:21,795 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 17:57:21,796 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting nondet_treeErr1REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-21 17:57:21,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:57:21,797 INFO L85 PathProgramCache]: Analyzing trace with hash 73597258, now seen corresponding path program 1 times [2021-12-21 17:57:21,797 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:57:21,797 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [511191465] [2021-12-21 17:57:21,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:21,798 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:57:21,798 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:57:21,799 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:57:21,801 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-12-21 17:57:21,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:21,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-21 17:57:21,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:21,864 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:57:21,874 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 17:57:21,875 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 17:57:21,875 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:57:21,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [511191465] [2021-12-21 17:57:21,876 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [511191465] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 17:57:21,876 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 17:57:21,876 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-21 17:57:21,876 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347397416] [2021-12-21 17:57:21,876 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 17:57:21,877 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-21 17:57:21,878 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:57:21,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-21 17:57:21,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-21 17:57:21,878 INFO L87 Difference]: Start difference. First operand 69 states and 80 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 17:57:21,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:57:21,961 INFO L93 Difference]: Finished difference Result 68 states and 79 transitions. [2021-12-21 17:57:21,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-21 17:57:21,962 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-12-21 17:57:21,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:57:21,963 INFO L225 Difference]: With dead ends: 68 [2021-12-21 17:57:21,963 INFO L226 Difference]: Without dead ends: 68 [2021-12-21 17:57:21,963 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-21 17:57:21,964 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 2 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 17:57:21,964 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 132 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 17:57:21,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-12-21 17:57:21,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-12-21 17:57:21,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 38 states have (on average 1.605263157894737) internal successors, (61), 55 states have internal predecessors, (61), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-21 17:57:21,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 79 transitions. [2021-12-21 17:57:21,971 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 79 transitions. Word has length 5 [2021-12-21 17:57:21,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:57:21,972 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 79 transitions. [2021-12-21 17:57:21,972 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 17:57:21,972 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 79 transitions. [2021-12-21 17:57:21,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-21 17:57:21,973 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:21,973 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 17:57:21,984 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-12-21 17:57:22,181 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 17:57:22,181 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting maxErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-21 17:57:22,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:57:22,182 INFO L85 PathProgramCache]: Analyzing trace with hash -345289291, now seen corresponding path program 1 times [2021-12-21 17:57:22,182 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:57:22,182 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1358299458] [2021-12-21 17:57:22,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:22,183 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:57:22,183 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:57:22,184 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:57:22,186 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-12-21 17:57:22,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:22,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-21 17:57:22,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:22,362 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 17:57:22,362 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 17:57:22,362 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:57:22,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1358299458] [2021-12-21 17:57:22,363 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1358299458] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 17:57:22,363 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 17:57:22,363 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-21 17:57:22,363 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270751213] [2021-12-21 17:57:22,363 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 17:57:22,364 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-21 17:57:22,364 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:57:22,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-21 17:57:22,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-21 17:57:22,365 INFO L87 Difference]: Start difference. First operand 68 states and 79 transitions. Second operand has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 17:57:22,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:57:22,458 INFO L93 Difference]: Finished difference Result 83 states and 98 transitions. [2021-12-21 17:57:22,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-21 17:57:22,459 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-12-21 17:57:22,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:57:22,462 INFO L225 Difference]: With dead ends: 83 [2021-12-21 17:57:22,462 INFO L226 Difference]: Without dead ends: 83 [2021-12-21 17:57:22,463 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-12-21 17:57:22,465 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 11 mSDsluCounter, 367 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 444 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 17:57:22,467 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 444 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 17:57:22,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-12-21 17:57:22,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 76. [2021-12-21 17:57:22,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 43 states have (on average 1.5348837209302326) internal successors, (66), 61 states have internal predecessors, (66), 10 states have call successors, (10), 4 states have call predecessors, (10), 5 states have return successors, (13), 10 states have call predecessors, (13), 10 states have call successors, (13) [2021-12-21 17:57:22,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 89 transitions. [2021-12-21 17:57:22,480 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 89 transitions. Word has length 11 [2021-12-21 17:57:22,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:57:22,481 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 89 transitions. [2021-12-21 17:57:22,481 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 17:57:22,481 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 89 transitions. [2021-12-21 17:57:22,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-21 17:57:22,482 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:22,482 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 17:57:22,490 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-12-21 17:57:22,689 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 17:57:22,690 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-21 17:57:22,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:57:22,690 INFO L85 PathProgramCache]: Analyzing trace with hash -159104294, now seen corresponding path program 1 times [2021-12-21 17:57:22,691 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:57:22,691 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1753147973] [2021-12-21 17:57:22,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:22,691 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:57:22,691 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:57:22,692 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:57:22,695 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-12-21 17:57:22,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:22,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-21 17:57:22,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:22,758 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:57:22,816 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 17:57:22,817 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 17:57:22,817 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:57:22,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1753147973] [2021-12-21 17:57:22,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1753147973] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 17:57:22,817 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 17:57:22,817 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-21 17:57:22,818 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910085400] [2021-12-21 17:57:22,818 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 17:57:22,818 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 17:57:22,818 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:57:22,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 17:57:22,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-21 17:57:22,819 INFO L87 Difference]: Start difference. First operand 76 states and 89 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 17:57:23,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:57:23,108 INFO L93 Difference]: Finished difference Result 80 states and 93 transitions. [2021-12-21 17:57:23,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-21 17:57:23,109 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-12-21 17:57:23,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:57:23,110 INFO L225 Difference]: With dead ends: 80 [2021-12-21 17:57:23,110 INFO L226 Difference]: Without dead ends: 80 [2021-12-21 17:57:23,110 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-21 17:57:23,111 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 49 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-21 17:57:23,111 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 72 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-21 17:57:23,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-12-21 17:57:23,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 78. [2021-12-21 17:57:23,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 45 states have (on average 1.5555555555555556) internal successors, (70), 61 states have internal predecessors, (70), 10 states have call successors, (10), 4 states have call predecessors, (10), 5 states have return successors, (13), 12 states have call predecessors, (13), 10 states have call successors, (13) [2021-12-21 17:57:23,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 93 transitions. [2021-12-21 17:57:23,120 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 93 transitions. Word has length 11 [2021-12-21 17:57:23,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:57:23,121 INFO L470 AbstractCegarLoop]: Abstraction has 78 states and 93 transitions. [2021-12-21 17:57:23,121 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 17:57:23,121 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 93 transitions. [2021-12-21 17:57:23,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-21 17:57:23,121 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:23,121 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 17:57:23,133 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-12-21 17:57:23,329 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 17:57:23,329 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting nondet_treeErr3REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-21 17:57:23,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:57:23,330 INFO L85 PathProgramCache]: Analyzing trace with hash -159104293, now seen corresponding path program 1 times [2021-12-21 17:57:23,330 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:57:23,331 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [562552026] [2021-12-21 17:57:23,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:23,331 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:57:23,331 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:57:23,332 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:57:23,334 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-12-21 17:57:23,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:23,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-21 17:57:23,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:23,419 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:57:23,501 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 17:57:23,502 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 17:57:23,502 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:57:23,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [562552026] [2021-12-21 17:57:23,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [562552026] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 17:57:23,503 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 17:57:23,503 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-21 17:57:23,504 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573229528] [2021-12-21 17:57:23,504 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 17:57:23,505 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 17:57:23,505 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:57:23,505 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 17:57:23,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-21 17:57:23,509 INFO L87 Difference]: Start difference. First operand 78 states and 93 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 17:57:23,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:57:23,716 INFO L93 Difference]: Finished difference Result 84 states and 103 transitions. [2021-12-21 17:57:23,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-21 17:57:23,717 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-12-21 17:57:23,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:57:23,718 INFO L225 Difference]: With dead ends: 84 [2021-12-21 17:57:23,718 INFO L226 Difference]: Without dead ends: 84 [2021-12-21 17:57:23,719 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-21 17:57:23,719 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 47 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 17:57:23,720 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 83 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 17:57:23,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-12-21 17:57:23,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 81. [2021-12-21 17:57:23,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 47 states have (on average 1.5106382978723405) internal successors, (71), 63 states have internal predecessors, (71), 11 states have call successors, (11), 4 states have call predecessors, (11), 5 states have return successors, (15), 13 states have call predecessors, (15), 11 states have call successors, (15) [2021-12-21 17:57:23,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 97 transitions. [2021-12-21 17:57:23,726 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 97 transitions. Word has length 11 [2021-12-21 17:57:23,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:57:23,727 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 97 transitions. [2021-12-21 17:57:23,727 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 17:57:23,727 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 97 transitions. [2021-12-21 17:57:23,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-12-21 17:57:23,728 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:23,728 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 17:57:23,744 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-12-21 17:57:23,937 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 17:57:23,937 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting checkErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-21 17:57:23,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:57:23,938 INFO L85 PathProgramCache]: Analyzing trace with hash -1041946460, now seen corresponding path program 1 times [2021-12-21 17:57:23,938 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:57:23,938 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1435991256] [2021-12-21 17:57:23,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:23,938 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:57:23,938 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:57:23,939 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:57:23,940 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-12-21 17:57:23,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:23,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-21 17:57:23,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:24,100 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 17:57:24,101 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 17:57:24,101 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:57:24,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1435991256] [2021-12-21 17:57:24,101 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1435991256] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 17:57:24,101 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 17:57:24,101 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-21 17:57:24,101 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912745333] [2021-12-21 17:57:24,102 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 17:57:24,102 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-21 17:57:24,102 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:57:24,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-21 17:57:24,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-21 17:57:24,103 INFO L87 Difference]: Start difference. First operand 81 states and 97 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-21 17:57:24,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:57:24,189 INFO L93 Difference]: Finished difference Result 92 states and 109 transitions. [2021-12-21 17:57:24,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-21 17:57:24,190 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2021-12-21 17:57:24,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:57:24,191 INFO L225 Difference]: With dead ends: 92 [2021-12-21 17:57:24,191 INFO L226 Difference]: Without dead ends: 92 [2021-12-21 17:57:24,191 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-12-21 17:57:24,192 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 10 mSDsluCounter, 367 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 444 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 17:57:24,192 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 444 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 17:57:24,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-12-21 17:57:24,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 87. [2021-12-21 17:57:24,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 51 states have (on average 1.4705882352941178) internal successors, (75), 67 states have internal predecessors, (75), 12 states have call successors, (12), 5 states have call predecessors, (12), 6 states have return successors, (16), 14 states have call predecessors, (16), 12 states have call successors, (16) [2021-12-21 17:57:24,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 103 transitions. [2021-12-21 17:57:24,199 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 103 transitions. Word has length 17 [2021-12-21 17:57:24,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:57:24,199 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 103 transitions. [2021-12-21 17:57:24,200 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-21 17:57:24,200 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 103 transitions. [2021-12-21 17:57:24,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-12-21 17:57:24,201 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:24,201 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 17:57:24,213 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-12-21 17:57:24,409 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 17:57:24,410 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONMEMORY_LEAK === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-21 17:57:24,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:57:24,411 INFO L85 PathProgramCache]: Analyzing trace with hash -868680531, now seen corresponding path program 1 times [2021-12-21 17:57:24,411 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:57:24,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1918023949] [2021-12-21 17:57:24,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:24,411 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:57:24,411 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:57:24,412 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:57:24,413 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-12-21 17:57:24,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:24,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-21 17:57:24,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:24,498 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 17:57:24,498 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 17:57:24,498 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:57:24,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1918023949] [2021-12-21 17:57:24,499 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1918023949] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 17:57:24,499 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 17:57:24,499 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-21 17:57:24,499 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281909382] [2021-12-21 17:57:24,499 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 17:57:24,499 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 17:57:24,499 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:57:24,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 17:57:24,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-21 17:57:24,500 INFO L87 Difference]: Start difference. First operand 87 states and 103 transitions. Second operand has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 1 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-21 17:57:24,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:57:24,659 INFO L93 Difference]: Finished difference Result 89 states and 104 transitions. [2021-12-21 17:57:24,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-21 17:57:24,662 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 1 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 20 [2021-12-21 17:57:24,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:57:24,662 INFO L225 Difference]: With dead ends: 89 [2021-12-21 17:57:24,662 INFO L226 Difference]: Without dead ends: 75 [2021-12-21 17:57:24,663 INFO L932 BasicCegarLoop]: 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 [2021-12-21 17:57:24,663 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 42 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 17:57:24,664 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 82 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 17:57:24,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-12-21 17:57:24,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-12-21 17:57:24,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 43 states have (on average 1.558139534883721) internal successors, (67), 59 states have internal predecessors, (67), 10 states have call successors, (10), 3 states have call predecessors, (10), 4 states have return successors, (13), 12 states have call predecessors, (13), 10 states have call successors, (13) [2021-12-21 17:57:24,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-12-21 17:57:24,669 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 20 [2021-12-21 17:57:24,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:57:24,669 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-12-21 17:57:24,669 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 1 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-21 17:57:24,669 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-12-21 17:57:24,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-21 17:57:24,670 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:24,670 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 17:57:24,680 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-12-21 17:57:24,877 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 17:57:24,878 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-21 17:57:24,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:57:24,878 INFO L85 PathProgramCache]: Analyzing trace with hash -360622958, now seen corresponding path program 1 times [2021-12-21 17:57:24,878 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:57:24,879 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [527252135] [2021-12-21 17:57:24,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:24,879 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:57:24,879 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:57:24,882 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:57:24,884 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-12-21 17:57:25,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:25,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-21 17:57:25,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:25,040 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:57:25,247 INFO L353 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-21 17:57:25,248 INFO L387 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 [2021-12-21 17:57:25,258 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-21 17:57:25,258 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 17:57:25,388 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:57:25,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [527252135] [2021-12-21 17:57:25,388 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [527252135] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 17:57:25,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [176591632] [2021-12-21 17:57:25,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:25,389 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-21 17:57:25,389 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-21 17:57:25,395 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-21 17:57:25,414 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-12-21 17:57:25,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:25,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-21 17:57:25,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:25,601 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:57:27,775 INFO L353 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-21 17:57:27,775 INFO L387 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 [2021-12-21 17:57:27,787 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-21 17:57:27,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 17:57:27,940 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [176591632] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 17:57:27,941 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 17:57:27,941 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-12-21 17:57:27,941 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [438924537] [2021-12-21 17:57:27,941 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 17:57:27,941 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-21 17:57:27,942 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:57:27,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-21 17:57:27,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=27, Unknown=1, NotChecked=0, Total=42 [2021-12-21 17:57:27,942 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 6 states, 5 states have (on average 5.4) internal successors, (27), 6 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-21 17:57:34,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:57:34,160 INFO L93 Difference]: Finished difference Result 84 states and 105 transitions. [2021-12-21 17:57:34,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 17:57:34,161 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.4) internal successors, (27), 6 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 29 [2021-12-21 17:57:34,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:57:34,162 INFO L225 Difference]: With dead ends: 84 [2021-12-21 17:57:34,162 INFO L226 Difference]: Without dead ends: 84 [2021-12-21 17:57:34,162 INFO L932 BasicCegarLoop]: 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 [2021-12-21 17:57:34,163 INFO L933 BasicCegarLoop]: 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, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 17:57:34,163 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 102 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 96 Invalid, 0 Unknown, 157 Unchecked, 0.2s Time] [2021-12-21 17:57:34,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-12-21 17:57:34,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 79. [2021-12-21 17:57:34,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 46 states have (on average 1.5434782608695652) internal successors, (71), 62 states have internal predecessors, (71), 10 states have call successors, (10), 3 states have call predecessors, (10), 5 states have return successors, (17), 13 states have call predecessors, (17), 10 states have call successors, (17) [2021-12-21 17:57:34,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 98 transitions. [2021-12-21 17:57:34,171 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 98 transitions. Word has length 29 [2021-12-21 17:57:34,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:57:34,171 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 98 transitions. [2021-12-21 17:57:34,171 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.4) internal successors, (27), 6 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-21 17:57:34,172 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 98 transitions. [2021-12-21 17:57:34,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-21 17:57:34,173 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:34,173 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 17:57:34,187 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-12-21 17:57:34,409 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2021-12-21 17:57:34,583 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2021-12-21 17:57:34,584 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting nondet_treeErr3REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-21 17:57:34,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:57:34,584 INFO L85 PathProgramCache]: Analyzing trace with hash -360622957, now seen corresponding path program 1 times [2021-12-21 17:57:34,585 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:57:34,585 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2793204] [2021-12-21 17:57:34,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:34,585 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:57:34,585 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:57:34,586 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:57:34,587 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-12-21 17:57:34,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:34,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-21 17:57:34,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:34,779 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:57:34,785 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:57:41,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 17:57:41,117 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-21 17:57:41,130 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-21 17:57:41,131 INFO L387 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 [2021-12-21 17:57:41,159 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-21 17:57:41,159 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 17:57:41,510 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:57:41,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2793204] [2021-12-21 17:57:41,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2793204] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 17:57:41,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1008338719] [2021-12-21 17:57:41,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:41,511 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-21 17:57:41,511 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-21 17:57:41,516 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-21 17:57:41,534 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2021-12-21 17:57:41,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:41,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-21 17:57:41,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:41,751 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:57:41,760 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:57:46,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 17:57:46,101 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-21 17:57:46,110 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-21 17:57:46,111 INFO L387 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 [2021-12-21 17:57:46,117 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-21 17:57:46,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 17:57:46,305 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1008338719] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 17:57:46,305 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 17:57:46,305 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-12-21 17:57:46,305 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428033733] [2021-12-21 17:57:46,305 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 17:57:46,305 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-21 17:57:46,306 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:57:46,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-21 17:57:46,306 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=51, Unknown=1, NotChecked=0, Total=72 [2021-12-21 17:57:46,306 INFO L87 Difference]: Start difference. First operand 79 states and 98 transitions. Second operand has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-21 17:57:46,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:57:46,517 INFO L93 Difference]: Finished difference Result 98 states and 130 transitions. [2021-12-21 17:57:46,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-21 17:57:46,518 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-12-21 17:57:46,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:57:46,519 INFO L225 Difference]: With dead ends: 98 [2021-12-21 17:57:46,519 INFO L226 Difference]: Without dead ends: 98 [2021-12-21 17:57:46,519 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 48 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=27, Invalid=62, Unknown=1, NotChecked=0, Total=90 [2021-12-21 17:57:46,520 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 99 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 92 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 17:57:46,520 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [103 Valid, 101 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 111 Invalid, 0 Unknown, 92 Unchecked, 0.2s Time] [2021-12-21 17:57:46,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-12-21 17:57:46,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 95. [2021-12-21 17:57:46,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 57 states have (on average 1.4385964912280702) internal successors, (82), 74 states have internal predecessors, (82), 13 states have call successors, (13), 4 states have call predecessors, (13), 7 states have return successors, (26), 16 states have call predecessors, (26), 13 states have call successors, (26) [2021-12-21 17:57:46,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 121 transitions. [2021-12-21 17:57:46,534 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 121 transitions. Word has length 29 [2021-12-21 17:57:46,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:57:46,535 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 121 transitions. [2021-12-21 17:57:46,535 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-21 17:57:46,536 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 121 transitions. [2021-12-21 17:57:46,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-12-21 17:57:46,536 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:46,537 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 17:57:46,554 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-12-21 17:57:46,751 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (12)] Ended with exit code 0 [2021-12-21 17:57:46,949 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2021-12-21 17:57:46,949 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting maxErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-21 17:57:46,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:57:46,950 INFO L85 PathProgramCache]: Analyzing trace with hash -694882647, now seen corresponding path program 1 times [2021-12-21 17:57:46,950 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:57:46,950 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1549160154] [2021-12-21 17:57:46,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:46,950 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:57:46,950 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:57:46,951 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:57:46,952 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-12-21 17:57:47,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:47,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-21 17:57:47,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:47,049 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:57:47,213 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 17:57:47,213 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 17:57:47,438 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 17:57:47,438 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:57:47,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1549160154] [2021-12-21 17:57:47,438 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1549160154] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 17:57:47,438 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 17:57:47,438 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2021-12-21 17:57:47,438 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630522249] [2021-12-21 17:57:47,439 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 17:57:47,439 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-21 17:57:47,439 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:57:47,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-21 17:57:47,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-12-21 17:57:47,440 INFO L87 Difference]: Start difference. First operand 95 states and 121 transitions. Second operand has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-21 17:57:48,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:57:48,020 INFO L93 Difference]: Finished difference Result 116 states and 148 transitions. [2021-12-21 17:57:48,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-21 17:57:48,021 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 25 [2021-12-21 17:57:48,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:57:48,022 INFO L225 Difference]: With dead ends: 116 [2021-12-21 17:57:48,022 INFO L226 Difference]: Without dead ends: 114 [2021-12-21 17:57:48,023 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2021-12-21 17:57:48,023 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 52 mSDsluCounter, 236 mSDsCounter, 0 mSdLazyCounter, 288 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 304 SdHoareTripleChecker+Invalid, 393 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 288 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 90 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-21 17:57:48,023 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 304 Invalid, 393 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 288 Invalid, 0 Unknown, 90 Unchecked, 0.5s Time] [2021-12-21 17:57:48,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-12-21 17:57:48,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 108. [2021-12-21 17:57:48,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 69 states have (on average 1.4202898550724639) internal successors, (98), 83 states have internal predecessors, (98), 15 states have call successors, (15), 6 states have call predecessors, (15), 8 states have return successors, (28), 18 states have call predecessors, (28), 15 states have call successors, (28) [2021-12-21 17:57:48,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 141 transitions. [2021-12-21 17:57:48,050 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 141 transitions. Word has length 25 [2021-12-21 17:57:48,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:57:48,051 INFO L470 AbstractCegarLoop]: Abstraction has 108 states and 141 transitions. [2021-12-21 17:57:48,051 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-21 17:57:48,051 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 141 transitions. [2021-12-21 17:57:48,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-12-21 17:57:48,053 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:48,054 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 17:57:48,067 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-12-21 17:57:48,263 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 17:57:48,263 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting maxErr1REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-21 17:57:48,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:57:48,264 INFO L85 PathProgramCache]: Analyzing trace with hash -694882646, now seen corresponding path program 1 times [2021-12-21 17:57:48,264 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:57:48,264 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [639831404] [2021-12-21 17:57:48,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:48,265 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:57:48,265 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:57:48,265 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:57:48,266 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-12-21 17:57:48,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:48,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-21 17:57:48,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:48,367 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:57:48,633 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 17:57:48,633 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 17:57:49,732 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 17:57:49,733 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:57:49,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [639831404] [2021-12-21 17:57:49,733 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [639831404] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 17:57:49,733 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 17:57:49,733 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2021-12-21 17:57:49,733 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259015210] [2021-12-21 17:57:49,733 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 17:57:49,735 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-21 17:57:49,735 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:57:49,735 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-21 17:57:49,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2021-12-21 17:57:49,735 INFO L87 Difference]: Start difference. First operand 108 states and 141 transitions. Second operand has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-21 17:57:51,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:57:51,131 INFO L93 Difference]: Finished difference Result 133 states and 176 transitions. [2021-12-21 17:57:51,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-21 17:57:51,133 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 25 [2021-12-21 17:57:51,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:57:51,134 INFO L225 Difference]: With dead ends: 133 [2021-12-21 17:57:51,134 INFO L226 Difference]: Without dead ends: 133 [2021-12-21 17:57:51,135 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=54, Invalid=288, Unknown=0, NotChecked=0, Total=342 [2021-12-21 17:57:51,135 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 62 mSDsluCounter, 393 mSDsCounter, 0 mSdLazyCounter, 440 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 466 SdHoareTripleChecker+Invalid, 546 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 88 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-12-21 17:57:51,135 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 466 Invalid, 546 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 440 Invalid, 0 Unknown, 88 Unchecked, 1.3s Time] [2021-12-21 17:57:51,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-12-21 17:57:51,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 124. [2021-12-21 17:57:51,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 81 states have (on average 1.3950617283950617) internal successors, (113), 95 states have internal predecessors, (113), 18 states have call successors, (18), 7 states have call predecessors, (18), 9 states have return successors, (31), 21 states have call predecessors, (31), 18 states have call successors, (31) [2021-12-21 17:57:51,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 162 transitions. [2021-12-21 17:57:51,143 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 162 transitions. Word has length 25 [2021-12-21 17:57:51,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:57:51,143 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 162 transitions. [2021-12-21 17:57:51,143 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-21 17:57:51,144 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 162 transitions. [2021-12-21 17:57:51,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-21 17:57:51,145 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:51,145 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 17:57:51,153 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-12-21 17:57:51,351 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 17:57:51,351 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting checkErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-21 17:57:51,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:57:51,352 INFO L85 PathProgramCache]: Analyzing trace with hash 986137240, now seen corresponding path program 1 times [2021-12-21 17:57:51,352 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:57:51,352 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1136293427] [2021-12-21 17:57:51,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:51,353 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:57:51,353 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:57:51,354 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:57:51,355 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-12-21 17:57:51,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:51,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-21 17:57:51,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:51,545 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-21 17:57:51,545 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 17:57:51,545 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:57:51,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1136293427] [2021-12-21 17:57:51,545 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1136293427] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 17:57:51,545 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 17:57:51,545 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-12-21 17:57:51,545 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509533895] [2021-12-21 17:57:51,545 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 17:57:51,546 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-21 17:57:51,546 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:57:51,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-21 17:57:51,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-12-21 17:57:51,546 INFO L87 Difference]: Start difference. First operand 124 states and 162 transitions. Second operand has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-21 17:57:51,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:57:51,777 INFO L93 Difference]: Finished difference Result 130 states and 171 transitions. [2021-12-21 17:57:51,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-21 17:57:51,778 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 31 [2021-12-21 17:57:51,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:57:51,779 INFO L225 Difference]: With dead ends: 130 [2021-12-21 17:57:51,779 INFO L226 Difference]: Without dead ends: 126 [2021-12-21 17:57:51,779 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-12-21 17:57:51,780 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 29 mSDsluCounter, 311 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 370 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 17:57:51,780 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 370 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 140 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 17:57:51,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-12-21 17:57:51,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 124. [2021-12-21 17:57:51,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 81 states have (on average 1.3703703703703705) internal successors, (111), 95 states have internal predecessors, (111), 18 states have call successors, (18), 7 states have call predecessors, (18), 9 states have return successors, (31), 21 states have call predecessors, (31), 18 states have call successors, (31) [2021-12-21 17:57:51,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 160 transitions. [2021-12-21 17:57:51,792 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 160 transitions. Word has length 31 [2021-12-21 17:57:51,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:57:51,792 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 160 transitions. [2021-12-21 17:57:51,792 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-21 17:57:51,792 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 160 transitions. [2021-12-21 17:57:51,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-21 17:57:51,799 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:51,800 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 17:57:51,807 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-12-21 17:57:52,000 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 17:57:52,001 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting maxErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-21 17:57:52,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:57:52,001 INFO L85 PathProgramCache]: Analyzing trace with hash 1746105865, now seen corresponding path program 1 times [2021-12-21 17:57:52,001 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:57:52,002 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1875340665] [2021-12-21 17:57:52,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:52,002 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:57:52,002 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:57:52,003 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:57:52,008 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-12-21 17:57:52,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:52,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 37 conjunts are in the unsatisfiable core [2021-12-21 17:57:52,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:52,195 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-21 17:57:52,207 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-21 17:57:52,311 INFO L353 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-12-21 17:57:52,311 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-12-21 17:57:52,326 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 17:57:52,327 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-12-21 17:57:52,602 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-12-21 17:57:52,606 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-12-21 17:57:52,747 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 17:57:52,747 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 17:57:53,597 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 17:57:53,597 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:57:53,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1875340665] [2021-12-21 17:57:53,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1875340665] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 17:57:53,597 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 17:57:53,597 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2021-12-21 17:57:53,597 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1670958150] [2021-12-21 17:57:53,597 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 17:57:53,598 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-21 17:57:53,598 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:57:53,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-21 17:57:53,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2021-12-21 17:57:53,599 INFO L87 Difference]: Start difference. First operand 124 states and 160 transitions. Second operand has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 4 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-21 17:57:54,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:57:54,402 INFO L93 Difference]: Finished difference Result 139 states and 178 transitions. [2021-12-21 17:57:54,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-12-21 17:57:54,404 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 4 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 31 [2021-12-21 17:57:54,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:57:54,405 INFO L225 Difference]: With dead ends: 139 [2021-12-21 17:57:54,405 INFO L226 Difference]: Without dead ends: 139 [2021-12-21 17:57:54,405 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-12-21 17:57:54,406 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 38 mSDsluCounter, 750 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 827 SdHoareTripleChecker+Invalid, 374 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 83 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-21 17:57:54,406 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 827 Invalid, 374 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 279 Invalid, 0 Unknown, 83 Unchecked, 0.6s Time] [2021-12-21 17:57:54,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-12-21 17:57:54,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 131. [2021-12-21 17:57:54,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 86 states have (on average 1.3604651162790697) internal successors, (117), 100 states have internal predecessors, (117), 18 states have call successors, (18), 9 states have call predecessors, (18), 11 states have return successors, (31), 21 states have call predecessors, (31), 18 states have call successors, (31) [2021-12-21 17:57:54,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 166 transitions. [2021-12-21 17:57:54,411 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 166 transitions. Word has length 31 [2021-12-21 17:57:54,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:57:54,412 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 166 transitions. [2021-12-21 17:57:54,412 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 4 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-21 17:57:54,412 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 166 transitions. [2021-12-21 17:57:54,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-21 17:57:54,413 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:54,413 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-12-21 17:57:54,427 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-12-21 17:57:54,613 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 17:57:54,613 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting nondet_treeErr4REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-21 17:57:54,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:57:54,614 INFO L85 PathProgramCache]: Analyzing trace with hash -1427695233, now seen corresponding path program 1 times [2021-12-21 17:57:54,614 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:57:54,614 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [848460805] [2021-12-21 17:57:54,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:54,614 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:57:54,614 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:57:54,616 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:57:54,617 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-12-21 17:57:54,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:54,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-21 17:57:54,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:54,750 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:57:54,964 INFO L353 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-21 17:57:54,964 INFO L387 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 [2021-12-21 17:57:54,972 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-21 17:57:54,972 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 17:57:55,131 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:57:55,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [848460805] [2021-12-21 17:57:55,132 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [848460805] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 17:57:55,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1605108072] [2021-12-21 17:57:55,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:55,132 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-21 17:57:55,132 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-21 17:57:55,136 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-21 17:57:55,162 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-12-21 17:57:55,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:55,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-21 17:57:55,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:55,311 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:57:57,428 INFO L353 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-21 17:57:57,428 INFO L387 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 [2021-12-21 17:57:57,434 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-21 17:57:57,434 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 17:57:57,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1605108072] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 17:57:57,561 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 17:57:57,561 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-12-21 17:57:57,562 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [414771045] [2021-12-21 17:57:57,562 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 17:57:57,562 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-21 17:57:57,562 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:57:57,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-21 17:57:57,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=27, Unknown=1, NotChecked=0, Total=42 [2021-12-21 17:57:57,563 INFO L87 Difference]: Start difference. First operand 131 states and 166 transitions. Second operand has 6 states, 5 states have (on average 5.2) internal successors, (26), 6 states have internal predecessors, (26), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-12-21 17:58:03,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:58:03,802 INFO L93 Difference]: Finished difference Result 133 states and 168 transitions. [2021-12-21 17:58:03,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 17:58:03,802 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.2) internal successors, (26), 6 states have internal predecessors, (26), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 31 [2021-12-21 17:58:03,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:58:03,803 INFO L225 Difference]: With dead ends: 133 [2021-12-21 17:58:03,803 INFO L226 Difference]: Without dead ends: 133 [2021-12-21 17:58:03,804 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 62 SyntacticMatches, 7 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=26, Invalid=44, Unknown=2, NotChecked=0, Total=72 [2021-12-21 17:58:03,804 INFO L933 BasicCegarLoop]: 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 [2021-12-21 17:58:03,804 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 100 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 92 Invalid, 0 Unknown, 160 Unchecked, 0.2s Time] [2021-12-21 17:58:03,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-12-21 17:58:03,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 131. [2021-12-21 17:58:03,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 86 states have (on average 1.3604651162790697) internal successors, (117), 100 states have internal predecessors, (117), 18 states have call successors, (18), 9 states have call predecessors, (18), 11 states have return successors, (31), 21 states have call predecessors, (31), 18 states have call successors, (31) [2021-12-21 17:58:03,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 166 transitions. [2021-12-21 17:58:03,824 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 166 transitions. Word has length 31 [2021-12-21 17:58:03,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:58:03,824 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 166 transitions. [2021-12-21 17:58:03,824 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.2) internal successors, (26), 6 states have internal predecessors, (26), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-12-21 17:58:03,824 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 166 transitions. [2021-12-21 17:58:03,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-21 17:58:03,825 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:58:03,826 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-12-21 17:58:03,839 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-12-21 17:58:04,038 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Ended with exit code 0 [2021-12-21 17:58:04,236 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2021-12-21 17:58:04,236 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting nondet_treeErr5REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-21 17:58:04,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:58:04,237 INFO L85 PathProgramCache]: Analyzing trace with hash -1427695232, now seen corresponding path program 1 times [2021-12-21 17:58:04,237 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:58:04,237 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1905170711] [2021-12-21 17:58:04,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:58:04,237 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:58:04,237 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:58:04,238 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:58:04,239 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-12-21 17:58:04,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:58:04,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-21 17:58:04,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:58:04,384 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:58:04,390 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:58:10,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 17:58:10,654 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-21 17:58:10,662 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-21 17:58:10,663 INFO L387 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 [2021-12-21 17:58:10,682 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-21 17:58:10,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 17:58:12,887 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:58:12,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1905170711] [2021-12-21 17:58:12,887 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1905170711] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 17:58:12,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1197525730] [2021-12-21 17:58:12,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:58:12,887 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-21 17:58:12,887 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-21 17:58:12,888 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-21 17:58:12,892 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2021-12-21 17:58:13,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:58:13,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-21 17:58:13,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:58:13,051 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:58:13,054 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:58:17,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 17:58:17,331 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-21 17:58:17,339 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-21 17:58:17,340 INFO L387 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 [2021-12-21 17:58:17,344 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-21 17:58:17,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 17:58:19,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1197525730] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 17:58:19,509 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 17:58:19,509 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-12-21 17:58:19,509 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376520737] [2021-12-21 17:58:19,509 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 17:58:19,510 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-21 17:58:19,510 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:58:19,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-21 17:58:19,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=50, Unknown=2, NotChecked=0, Total=72 [2021-12-21 17:58:19,510 INFO L87 Difference]: Start difference. First operand 131 states and 166 transitions. Second operand has 7 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-21 17:58:19,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:58:19,731 INFO L93 Difference]: Finished difference Result 135 states and 176 transitions. [2021-12-21 17:58:19,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-21 17:58:19,731 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 31 [2021-12-21 17:58:19,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:58:19,732 INFO L225 Difference]: With dead ends: 135 [2021-12-21 17:58:19,732 INFO L226 Difference]: Without dead ends: 135 [2021-12-21 17:58:19,733 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 52 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 14.3s TimeCoverageRelationStatistics Valid=27, Invalid=61, Unknown=2, NotChecked=0, Total=90 [2021-12-21 17:58:19,733 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 44 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 92 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 17:58:19,733 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 112 Invalid, 269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 167 Invalid, 0 Unknown, 92 Unchecked, 0.2s Time] [2021-12-21 17:58:19,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-12-21 17:58:19,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 131. [2021-12-21 17:58:19,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 86 states have (on average 1.3604651162790697) internal successors, (117), 100 states have internal predecessors, (117), 18 states have call successors, (18), 9 states have call predecessors, (18), 11 states have return successors, (31), 21 states have call predecessors, (31), 18 states have call successors, (31) [2021-12-21 17:58:19,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 166 transitions. [2021-12-21 17:58:19,739 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 166 transitions. Word has length 31 [2021-12-21 17:58:19,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:58:19,739 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 166 transitions. [2021-12-21 17:58:19,740 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-21 17:58:19,740 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 166 transitions. [2021-12-21 17:58:19,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-12-21 17:58:19,748 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:58:19,748 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1] [2021-12-21 17:58:19,751 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (20)] Forceful destruction successful, exit code 0 [2021-12-21 17:58:19,957 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Ended with exit code 0 [2021-12-21 17:58:20,151 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 17:58:20,151 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-21 17:58:20,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:58:20,151 INFO L85 PathProgramCache]: Analyzing trace with hash 1805515892, now seen corresponding path program 2 times [2021-12-21 17:58:20,152 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:58:20,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [819299932] [2021-12-21 17:58:20,152 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 17:58:20,152 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:58:20,152 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:58:20,153 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:58:20,162 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-12-21 17:58:20,382 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 17:58:20,382 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 17:58:20,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-21 17:58:20,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:58:20,416 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:58:24,644 INFO L353 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2021-12-21 17:58:24,645 INFO L387 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 [2021-12-21 17:58:24,727 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 41 proven. 27 refuted. 3 times theorem prover too weak. 19 trivial. 0 not checked. [2021-12-21 17:58:24,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 17:58:25,795 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:58:25,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [819299932] [2021-12-21 17:58:25,795 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [819299932] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 17:58:25,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [894944909] [2021-12-21 17:58:25,796 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 17:58:25,796 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-21 17:58:25,796 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-21 17:58:25,797 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-21 17:58:25,798 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-12-21 17:58:25,979 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 17:58:25,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1865991685] [2021-12-21 17:58:25,980 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 17:58:25,980 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 17:58:25,980 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 17:58:25,981 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 1 [2021-12-21 17:58:25,981 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 17:58:25,987 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-12-21 17:58:26,153 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 17:58:26,153 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 17:58:26,157 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-21 17:58:26,158 INFO L286 TraceCheckSpWp]: Computing forward predicates...