./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 e19ca921 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-e19ca92 [2021-12-22 16:23:42,268 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-22 16:23:42,281 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-22 16:23:42,323 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-22 16:23:42,324 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-22 16:23:42,325 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-22 16:23:42,328 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-22 16:23:42,333 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-22 16:23:42,335 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-22 16:23:42,340 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-22 16:23:42,341 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-22 16:23:42,342 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-22 16:23:42,342 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-22 16:23:42,345 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-22 16:23:42,347 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-22 16:23:42,348 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-22 16:23:42,349 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-22 16:23:42,350 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-22 16:23:42,354 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-22 16:23:42,358 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-22 16:23:42,359 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-22 16:23:42,360 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-22 16:23:42,362 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-22 16:23:42,362 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-22 16:23:42,364 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-22 16:23:42,364 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-22 16:23:42,365 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-22 16:23:42,365 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-22 16:23:42,366 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-22 16:23:42,366 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-22 16:23:42,367 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-22 16:23:42,367 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-22 16:23:42,368 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-22 16:23:42,369 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-22 16:23:42,370 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-22 16:23:42,371 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-22 16:23:42,372 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-22 16:23:42,372 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-22 16:23:42,372 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-22 16:23:42,373 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-22 16:23:42,373 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-22 16:23:42,375 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-32bit-Automizer_Default.epf [2021-12-22 16:23:42,405 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-22 16:23:42,405 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-22 16:23:42,406 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-22 16:23:42,406 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-22 16:23:42,407 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-22 16:23:42,407 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-22 16:23:42,407 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-22 16:23:42,408 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-22 16:23:42,408 INFO L138 SettingsManager]: * Use SBE=true [2021-12-22 16:23:42,408 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-22 16:23:42,409 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-22 16:23:42,409 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-22 16:23:42,409 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-22 16:23:42,409 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-22 16:23:42,410 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-22 16:23:42,410 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-22 16:23:42,410 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-22 16:23:42,410 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-22 16:23:42,410 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-22 16:23:42,411 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-22 16:23:42,411 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-22 16:23:42,411 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-22 16:23:42,411 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-22 16:23:42,411 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-22 16:23:42,412 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 16:23:42,412 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-22 16:23:42,412 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-22 16:23:42,412 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-22 16:23:42,412 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-22 16:23:42,413 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-22 16:23:42,413 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e98a60ea9ee0c00575c08606ce8b95d0660c5b235c5932147dfee4b13512f57c [2021-12-22 16:23:42,644 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-22 16:23:42,671 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-22 16:23:42,674 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-22 16:23:42,675 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-22 16:23:42,676 INFO L275 PluginConnector]: CDTParser initialized [2021-12-22 16:23:42,677 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/verifythis/tree_max.c [2021-12-22 16:23:42,743 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5fd2cabb5/c29e46a5429b4a4f91433f5db659326c/FLAG021790533 [2021-12-22 16:23:43,164 INFO L306 CDTParser]: Found 1 translation units. [2021-12-22 16:23:43,165 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_max.c [2021-12-22 16:23:43,174 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5fd2cabb5/c29e46a5429b4a4f91433f5db659326c/FLAG021790533 [2021-12-22 16:23:43,559 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5fd2cabb5/c29e46a5429b4a4f91433f5db659326c [2021-12-22 16:23:43,561 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-22 16:23:43,563 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-22 16:23:43,566 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-22 16:23:43,567 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-22 16:23:43,570 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-22 16:23:43,570 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 04:23:43" (1/1) ... [2021-12-22 16:23:43,571 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4210e122 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:43, skipping insertion in model container [2021-12-22 16:23:43,572 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 04:23:43" (1/1) ... [2021-12-22 16:23:43,579 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-22 16:23:43,592 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-22 16:23:43,717 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] [2021-12-22 16:23:43,743 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 16:23:43,755 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) [2021-12-22 16:23:43,756 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@3a1281b3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:43, skipping insertion in model container [2021-12-22 16:23:43,756 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-22 16:23:43,757 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-12-22 16:23:43,760 INFO L158 Benchmark]: Toolchain (without parser) took 194.55ms. Allocated memory was 90.2MB in the beginning and 113.2MB in the end (delta: 23.1MB). Free memory was 59.7MB in the beginning and 90.1MB in the end (delta: -30.4MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-12-22 16:23:43,761 INFO L158 Benchmark]: CDTParser took 0.24ms. Allocated memory is still 90.2MB. Free memory is still 47.3MB. There was no memory consumed. Max. memory is 16.1GB. [2021-12-22 16:23:43,763 INFO L158 Benchmark]: CACSL2BoogieTranslator took 190.32ms. Allocated memory was 90.2MB in the beginning and 113.2MB in the end (delta: 23.1MB). Free memory was 59.4MB in the beginning and 90.7MB in the end (delta: -31.2MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-12-22 16:23:43,767 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 90.2MB. Free memory is still 47.3MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 190.32ms. Allocated memory was 90.2MB in the beginning and 113.2MB in the end (delta: 23.1MB). Free memory was 59.4MB in the beginning and 90.7MB in the end (delta: -31.2MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 27]: Unsupported Syntax Found a cast between two array/pointer types 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-e19ca92 [2021-12-22 16:23:45,607 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-22 16:23:45,609 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-22 16:23:45,635 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-22 16:23:45,635 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-22 16:23:45,636 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-22 16:23:45,638 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-22 16:23:45,639 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-22 16:23:45,641 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-22 16:23:45,642 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-22 16:23:45,643 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-22 16:23:45,644 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-22 16:23:45,644 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-22 16:23:45,645 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-22 16:23:45,646 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-22 16:23:45,647 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-22 16:23:45,648 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-22 16:23:45,649 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-22 16:23:45,650 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-22 16:23:45,652 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-22 16:23:45,653 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-22 16:23:45,659 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-22 16:23:45,660 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-22 16:23:45,662 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-22 16:23:45,665 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-22 16:23:45,672 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-22 16:23:45,673 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-22 16:23:45,674 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-22 16:23:45,674 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-22 16:23:45,675 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-22 16:23:45,676 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-22 16:23:45,677 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-22 16:23:45,678 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-22 16:23:45,680 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-22 16:23:45,681 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-22 16:23:45,682 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-22 16:23:45,683 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-22 16:23:45,683 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-22 16:23:45,683 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-22 16:23:45,684 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-22 16:23:45,685 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-22 16:23:45,686 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-32bit-Automizer_Bitvector.epf [2021-12-22 16:23:45,722 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-22 16:23:45,723 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-22 16:23:45,723 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-22 16:23:45,723 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-22 16:23:45,724 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-22 16:23:45,724 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-22 16:23:45,725 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-22 16:23:45,725 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-22 16:23:45,725 INFO L138 SettingsManager]: * Use SBE=true [2021-12-22 16:23:45,726 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-22 16:23:45,726 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-22 16:23:45,726 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-22 16:23:45,727 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-22 16:23:45,727 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-22 16:23:45,727 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-22 16:23:45,727 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-22 16:23:45,727 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-22 16:23:45,728 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-22 16:23:45,728 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-22 16:23:45,728 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-12-22 16:23:45,728 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-12-22 16:23:45,728 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-22 16:23:45,729 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-22 16:23:45,729 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-22 16:23:45,729 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-22 16:23:45,729 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-22 16:23:45,730 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 16:23:45,730 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-22 16:23:45,730 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-22 16:23:45,730 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2021-12-22 16:23:45,730 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-12-22 16:23:45,731 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-22 16:23:45,731 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-12-22 16:23:45,731 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e98a60ea9ee0c00575c08606ce8b95d0660c5b235c5932147dfee4b13512f57c [2021-12-22 16:23:46,043 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-22 16:23:46,064 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-22 16:23:46,067 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-22 16:23:46,068 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-22 16:23:46,069 INFO L275 PluginConnector]: CDTParser initialized [2021-12-22 16:23:46,070 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/verifythis/tree_max.c [2021-12-22 16:23:46,126 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e480395f7/9742f663f8ce42498c545fcebb5ebd51/FLAGdffbb1791 [2021-12-22 16:23:46,580 INFO L306 CDTParser]: Found 1 translation units. [2021-12-22 16:23:46,581 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_max.c [2021-12-22 16:23:46,588 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e480395f7/9742f663f8ce42498c545fcebb5ebd51/FLAGdffbb1791 [2021-12-22 16:23:46,613 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e480395f7/9742f663f8ce42498c545fcebb5ebd51 [2021-12-22 16:23:46,615 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-22 16:23:46,618 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-22 16:23:46,620 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-22 16:23:46,620 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-22 16:23:46,624 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-22 16:23:46,625 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 04:23:46" (1/1) ... [2021-12-22 16:23:46,626 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@17028661 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:46, skipping insertion in model container [2021-12-22 16:23:46,626 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 04:23:46" (1/1) ... [2021-12-22 16:23:46,633 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-22 16:23:46,648 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-22 16:23:46,753 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] [2021-12-22 16:23:46,782 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 16:23:46,803 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-12-22 16:23:46,811 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-22 16:23:46,824 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] [2021-12-22 16:23:46,841 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 16:23:46,853 INFO L203 MainTranslator]: Completed pre-run [2021-12-22 16:23:46,875 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] [2021-12-22 16:23:46,902 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 16:23:46,918 INFO L208 MainTranslator]: Completed translation [2021-12-22 16:23:46,919 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:46 WrapperNode [2021-12-22 16:23:46,919 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-22 16:23:46,920 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-22 16:23:46,921 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-22 16:23:46,921 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-22 16:23:46,926 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:46" (1/1) ... [2021-12-22 16:23:46,943 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:46" (1/1) ... [2021-12-22 16:23:46,962 INFO L137 Inliner]: procedures = 26, calls = 28, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 37 [2021-12-22 16:23:46,963 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-22 16:23:46,964 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-22 16:23:46,964 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-22 16:23:46,965 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-22 16:23:46,972 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:46" (1/1) ... [2021-12-22 16:23:46,972 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:46" (1/1) ... [2021-12-22 16:23:46,978 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:46" (1/1) ... [2021-12-22 16:23:46,979 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:46" (1/1) ... [2021-12-22 16:23:46,997 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:46" (1/1) ... [2021-12-22 16:23:47,002 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:46" (1/1) ... [2021-12-22 16:23:47,007 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:46" (1/1) ... [2021-12-22 16:23:47,010 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-22 16:23:47,012 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-22 16:23:47,013 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-22 16:23:47,013 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-22 16:23:47,014 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:46" (1/1) ... [2021-12-22 16:23:47,020 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 16:23:47,029 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 16:23:47,049 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) [2021-12-22 16:23:47,071 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 [2021-12-22 16:23:47,102 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-22 16:23:47,103 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-12-22 16:23:47,103 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-12-22 16:23:47,103 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-12-22 16:23:47,103 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-12-22 16:23:47,103 INFO L130 BoogieDeclarations]: Found specification of procedure max [2021-12-22 16:23:47,104 INFO L138 BoogieDeclarations]: Found implementation of procedure max [2021-12-22 16:23:47,104 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2021-12-22 16:23:47,104 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2021-12-22 16:23:47,104 INFO L130 BoogieDeclarations]: Found specification of procedure check [2021-12-22 16:23:47,104 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2021-12-22 16:23:47,105 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-22 16:23:47,105 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-22 16:23:47,105 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-22 16:23:47,105 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-12-22 16:23:47,201 INFO L234 CfgBuilder]: Building ICFG [2021-12-22 16:23:47,202 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-22 16:23:47,509 INFO L275 CfgBuilder]: Performing block encoding [2021-12-22 16:23:47,515 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-22 16:23:47,522 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-12-22 16:23:47,524 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 04:23:47 BoogieIcfgContainer [2021-12-22 16:23:47,524 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-22 16:23:47,525 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-22 16:23:47,526 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-22 16:23:47,529 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-22 16:23:47,530 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 04:23:46" (1/3) ... [2021-12-22 16:23:47,530 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ec7517 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 04:23:47, skipping insertion in model container [2021-12-22 16:23:47,531 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:46" (2/3) ... [2021-12-22 16:23:47,531 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ec7517 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 04:23:47, skipping insertion in model container [2021-12-22 16:23:47,531 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 04:23:47" (3/3) ... [2021-12-22 16:23:47,532 INFO L111 eAbstractionObserver]: Analyzing ICFG tree_max.c [2021-12-22 16:23:47,538 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-22 16:23:47,538 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 20 error locations. [2021-12-22 16:23:47,583 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-22 16:23:47,593 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 [2021-12-22 16:23:47,593 INFO L340 AbstractCegarLoop]: Starting to check reachability of 20 error locations. [2021-12-22 16:23:47,620 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) [2021-12-22 16:23:47,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-12-22 16:23:47,629 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:23:47,630 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-12-22 16:23:47,630 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting nondet_treeErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-22 16:23:47,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:23:47,636 INFO L85 PathProgramCache]: Analyzing trace with hash 73597257, now seen corresponding path program 1 times [2021-12-22 16:23:47,646 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:23:47,646 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1620520782] [2021-12-22 16:23:47,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:23:47,647 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:23:47,648 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:23:47,653 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) [2021-12-22 16:23:47,655 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-12-22 16:23:47,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:23:47,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-22 16:23:47,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:23:47,840 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 [2021-12-22 16:23:47,850 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:23:47,850 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:23:47,851 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:23:47,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1620520782] [2021-12-22 16:23:47,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1620520782] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:23:47,853 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:23:47,853 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 16:23:47,855 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176257697] [2021-12-22 16:23:47,856 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:23:47,859 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 16:23:47,861 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:23:47,889 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 16:23:47,890 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 16:23:47,892 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) [2021-12-22 16:23:48,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:23:48,009 INFO L93 Difference]: Finished difference Result 73 states and 86 transitions. [2021-12-22 16:23:48,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 16:23:48,011 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 [2021-12-22 16:23:48,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:23:48,018 INFO L225 Difference]: With dead ends: 73 [2021-12-22 16:23:48,019 INFO L226 Difference]: Without dead ends: 71 [2021-12-22 16:23:48,020 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 [2021-12-22 16:23:48,023 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 [2021-12-22 16:23:48,023 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] [2021-12-22 16:23:48,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-12-22 16:23:48,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 69. [2021-12-22 16:23:48,056 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) [2021-12-22 16:23:48,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 80 transitions. [2021-12-22 16:23:48,060 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 80 transitions. Word has length 5 [2021-12-22 16:23:48,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:23:48,060 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 80 transitions. [2021-12-22 16:23:48,060 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) [2021-12-22 16:23:48,061 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 80 transitions. [2021-12-22 16:23:48,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-12-22 16:23:48,062 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:23:48,062 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-12-22 16:23:48,073 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-12-22 16:23:48,270 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:23:48,271 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting nondet_treeErr1REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-22 16:23:48,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:23:48,272 INFO L85 PathProgramCache]: Analyzing trace with hash 73597258, now seen corresponding path program 1 times [2021-12-22 16:23:48,272 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:23:48,272 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1420261278] [2021-12-22 16:23:48,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:23:48,273 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:23:48,273 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:23:48,274 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) [2021-12-22 16:23:48,276 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-12-22 16:23:48,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:23:48,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-22 16:23:48,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:23:48,353 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 [2021-12-22 16:23:48,366 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:23:48,367 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:23:48,367 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:23:48,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1420261278] [2021-12-22 16:23:48,367 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1420261278] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:23:48,368 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:23:48,368 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 16:23:48,369 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795699502] [2021-12-22 16:23:48,369 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:23:48,370 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 16:23:48,371 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:23:48,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 16:23:48,372 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 16:23:48,372 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) [2021-12-22 16:23:48,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:23:48,476 INFO L93 Difference]: Finished difference Result 68 states and 79 transitions. [2021-12-22 16:23:48,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 16:23:48,477 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 [2021-12-22 16:23:48,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:23:48,479 INFO L225 Difference]: With dead ends: 68 [2021-12-22 16:23:48,479 INFO L226 Difference]: Without dead ends: 68 [2021-12-22 16:23:48,479 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 [2021-12-22 16:23:48,480 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 [2021-12-22 16:23:48,481 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] [2021-12-22 16:23:48,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-12-22 16:23:48,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-12-22 16:23:48,488 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) [2021-12-22 16:23:48,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 79 transitions. [2021-12-22 16:23:48,493 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 79 transitions. Word has length 5 [2021-12-22 16:23:48,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:23:48,493 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 79 transitions. [2021-12-22 16:23:48,493 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) [2021-12-22 16:23:48,494 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 79 transitions. [2021-12-22 16:23:48,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-22 16:23:48,494 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:23:48,494 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:23:48,503 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-12-22 16:23:48,695 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:23:48,695 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting maxErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-22 16:23:48,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:23:48,696 INFO L85 PathProgramCache]: Analyzing trace with hash -345289291, now seen corresponding path program 1 times [2021-12-22 16:23:48,696 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:23:48,697 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1591633022] [2021-12-22 16:23:48,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:23:48,697 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:23:48,697 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:23:48,698 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) [2021-12-22 16:23:48,701 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-12-22 16:23:48,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:23:48,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-22 16:23:48,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:23:48,911 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:23:48,911 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:23:48,911 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:23:48,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1591633022] [2021-12-22 16:23:48,914 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1591633022] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:23:48,915 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:23:48,915 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-22 16:23:48,915 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576205302] [2021-12-22 16:23:48,919 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:23:48,919 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-22 16:23:48,920 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:23:48,920 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-22 16:23:48,921 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-22 16:23:48,923 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) [2021-12-22 16:23:49,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:23:49,032 INFO L93 Difference]: Finished difference Result 83 states and 98 transitions. [2021-12-22 16:23:49,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-22 16:23:49,033 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 [2021-12-22 16:23:49,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:23:49,036 INFO L225 Difference]: With dead ends: 83 [2021-12-22 16:23:49,036 INFO L226 Difference]: Without dead ends: 83 [2021-12-22 16:23:49,036 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 [2021-12-22 16:23:49,037 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 [2021-12-22 16:23:49,038 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] [2021-12-22 16:23:49,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-12-22 16:23:49,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 76. [2021-12-22 16:23:49,051 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) [2021-12-22 16:23:49,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 89 transitions. [2021-12-22 16:23:49,053 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 89 transitions. Word has length 11 [2021-12-22 16:23:49,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:23:49,054 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 89 transitions. [2021-12-22 16:23:49,054 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) [2021-12-22 16:23:49,054 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 89 transitions. [2021-12-22 16:23:49,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-22 16:23:49,055 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:23:49,055 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:23:49,064 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-12-22 16:23:49,264 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:23:49,264 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-22 16:23:49,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:23:49,265 INFO L85 PathProgramCache]: Analyzing trace with hash -159104294, now seen corresponding path program 1 times [2021-12-22 16:23:49,266 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:23:49,266 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1061986156] [2021-12-22 16:23:49,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:23:49,266 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:23:49,267 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:23:49,268 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) [2021-12-22 16:23:49,271 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-12-22 16:23:49,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:23:49,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-22 16:23:49,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:23:49,354 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 [2021-12-22 16:23:49,397 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:23:49,398 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:23:49,398 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:23:49,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1061986156] [2021-12-22 16:23:49,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1061986156] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:23:49,398 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:23:49,399 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-22 16:23:49,399 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039698707] [2021-12-22 16:23:49,399 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:23:49,399 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-22 16:23:49,400 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:23:49,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-22 16:23:49,400 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-22 16:23:49,401 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) [2021-12-22 16:23:49,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:23:49,609 INFO L93 Difference]: Finished difference Result 80 states and 93 transitions. [2021-12-22 16:23:49,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-22 16:23:49,610 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 [2021-12-22 16:23:49,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:23:49,611 INFO L225 Difference]: With dead ends: 80 [2021-12-22 16:23:49,611 INFO L226 Difference]: Without dead ends: 80 [2021-12-22 16:23:49,611 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 [2021-12-22 16:23:49,612 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 49 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 16:23:49,612 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 72 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-22 16:23:49,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-12-22 16:23:49,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 78. [2021-12-22 16:23:49,617 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) [2021-12-22 16:23:49,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 93 transitions. [2021-12-22 16:23:49,618 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 93 transitions. Word has length 11 [2021-12-22 16:23:49,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:23:49,619 INFO L470 AbstractCegarLoop]: Abstraction has 78 states and 93 transitions. [2021-12-22 16:23:49,622 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) [2021-12-22 16:23:49,624 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 93 transitions. [2021-12-22 16:23:49,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-22 16:23:49,624 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:23:49,625 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:23:49,637 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-12-22 16:23:49,834 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:23:49,834 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting nondet_treeErr3REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-22 16:23:49,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:23:49,835 INFO L85 PathProgramCache]: Analyzing trace with hash -159104293, now seen corresponding path program 1 times [2021-12-22 16:23:49,835 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:23:49,835 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2123198930] [2021-12-22 16:23:49,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:23:49,835 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:23:49,836 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:23:49,840 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) [2021-12-22 16:23:49,841 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-12-22 16:23:49,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:23:49,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-22 16:23:49,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:23:49,911 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 [2021-12-22 16:23:49,985 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:23:49,986 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:23:49,986 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:23:49,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2123198930] [2021-12-22 16:23:49,986 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2123198930] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:23:49,986 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:23:49,987 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-22 16:23:49,987 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1357004351] [2021-12-22 16:23:49,987 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:23:49,988 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-22 16:23:49,988 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:23:49,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-22 16:23:49,989 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-22 16:23:49,989 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) [2021-12-22 16:23:50,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:23:50,215 INFO L93 Difference]: Finished difference Result 84 states and 103 transitions. [2021-12-22 16:23:50,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-22 16:23:50,215 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 [2021-12-22 16:23:50,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:23:50,216 INFO L225 Difference]: With dead ends: 84 [2021-12-22 16:23:50,217 INFO L226 Difference]: Without dead ends: 84 [2021-12-22 16:23:50,217 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 [2021-12-22 16:23:50,218 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 [2021-12-22 16:23:50,218 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] [2021-12-22 16:23:50,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-12-22 16:23:50,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 81. [2021-12-22 16:23:50,229 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) [2021-12-22 16:23:50,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 97 transitions. [2021-12-22 16:23:50,231 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 97 transitions. Word has length 11 [2021-12-22 16:23:50,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:23:50,231 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 97 transitions. [2021-12-22 16:23:50,231 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) [2021-12-22 16:23:50,231 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 97 transitions. [2021-12-22 16:23:50,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-12-22 16:23:50,232 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:23:50,232 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:23:50,247 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-12-22 16:23:50,444 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:23:50,444 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting checkErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-22 16:23:50,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:23:50,445 INFO L85 PathProgramCache]: Analyzing trace with hash -1041946460, now seen corresponding path program 1 times [2021-12-22 16:23:50,445 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:23:50,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1555079599] [2021-12-22 16:23:50,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:23:50,446 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:23:50,446 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:23:50,447 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) [2021-12-22 16:23:50,449 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-12-22 16:23:50,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:23:50,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-22 16:23:50,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:23:50,602 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:23:50,602 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:23:50,603 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:23:50,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1555079599] [2021-12-22 16:23:50,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1555079599] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:23:50,603 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:23:50,603 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-22 16:23:50,604 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29242454] [2021-12-22 16:23:50,604 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:23:50,604 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-22 16:23:50,604 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:23:50,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-22 16:23:50,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-22 16:23:50,605 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) [2021-12-22 16:23:50,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:23:50,688 INFO L93 Difference]: Finished difference Result 92 states and 109 transitions. [2021-12-22 16:23:50,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-22 16:23:50,688 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 [2021-12-22 16:23:50,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:23:50,689 INFO L225 Difference]: With dead ends: 92 [2021-12-22 16:23:50,690 INFO L226 Difference]: Without dead ends: 92 [2021-12-22 16:23:50,690 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 [2021-12-22 16:23:50,691 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 [2021-12-22 16:23:50,691 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] [2021-12-22 16:23:50,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-12-22 16:23:50,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 87. [2021-12-22 16:23:50,698 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) [2021-12-22 16:23:50,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 103 transitions. [2021-12-22 16:23:50,699 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 103 transitions. Word has length 17 [2021-12-22 16:23:50,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:23:50,700 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 103 transitions. [2021-12-22 16:23:50,700 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) [2021-12-22 16:23:50,700 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 103 transitions. [2021-12-22 16:23:50,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-12-22 16:23:50,701 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:23:50,701 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] [2021-12-22 16:23:50,714 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-12-22 16:23:50,910 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:23:50,910 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONMEMORY_LEAK === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-22 16:23:50,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:23:50,911 INFO L85 PathProgramCache]: Analyzing trace with hash -868680531, now seen corresponding path program 1 times [2021-12-22 16:23:50,911 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:23:50,911 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [698236675] [2021-12-22 16:23:50,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:23:50,912 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:23:50,912 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:23:50,913 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) [2021-12-22 16:23:50,913 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-12-22 16:23:50,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:23:50,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-22 16:23:50,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:23:51,006 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:23:51,006 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:23:51,007 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:23:51,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [698236675] [2021-12-22 16:23:51,007 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [698236675] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:23:51,009 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:23:51,010 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-22 16:23:51,010 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [280118340] [2021-12-22 16:23:51,010 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:23:51,010 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-22 16:23:51,010 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:23:51,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-22 16:23:51,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-22 16:23:51,011 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) [2021-12-22 16:23:51,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:23:51,178 INFO L93 Difference]: Finished difference Result 89 states and 104 transitions. [2021-12-22 16:23:51,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-22 16:23:51,181 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 [2021-12-22 16:23:51,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:23:51,182 INFO L225 Difference]: With dead ends: 89 [2021-12-22 16:23:51,182 INFO L226 Difference]: Without dead ends: 75 [2021-12-22 16:23:51,182 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 [2021-12-22 16:23:51,183 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 [2021-12-22 16:23:51,183 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] [2021-12-22 16:23:51,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-12-22 16:23:51,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-12-22 16:23:51,188 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) [2021-12-22 16:23:51,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-12-22 16:23:51,189 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 20 [2021-12-22 16:23:51,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:23:51,190 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-12-22 16:23:51,190 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) [2021-12-22 16:23:51,190 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-12-22 16:23:51,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-22 16:23:51,191 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:23:51,191 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:23:51,207 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-12-22 16:23:51,407 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:23:51,408 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-22 16:23:51,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:23:51,409 INFO L85 PathProgramCache]: Analyzing trace with hash -360622958, now seen corresponding path program 1 times [2021-12-22 16:23:51,409 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:23:51,409 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1598889364] [2021-12-22 16:23:51,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:23:51,409 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:23:51,409 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:23:51,410 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) [2021-12-22 16:23:51,411 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-12-22 16:23:51,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:23:51,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-22 16:23:51,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:23:51,588 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 [2021-12-22 16:23:51,821 INFO L353 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-22 16:23:51,821 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 [2021-12-22 16:23:51,836 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-22 16:23:51,836 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:23:51,994 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:23:51,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1598889364] [2021-12-22 16:23:51,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1598889364] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:23:51,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [656502706] [2021-12-22 16:23:51,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:23:51,995 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-22 16:23:51,995 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-22 16:23:52,001 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) [2021-12-22 16:23:52,014 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-12-22 16:23:52,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:23:52,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-22 16:23:52,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:23:52,194 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 [2021-12-22 16:23:54,350 INFO L353 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-22 16:23:54,351 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 [2021-12-22 16:23:54,359 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-22 16:23:54,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:23:54,529 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [656502706] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:23:54,529 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:23:54,529 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-12-22 16:23:54,529 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1763838789] [2021-12-22 16:23:54,529 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:23:54,529 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-22 16:23:54,529 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:23:54,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-22 16:23:54,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=27, Unknown=1, NotChecked=0, Total=42 [2021-12-22 16:23:54,530 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) [2021-12-22 16:24:00,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:24:00,761 INFO L93 Difference]: Finished difference Result 84 states and 105 transitions. [2021-12-22 16:24:00,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-22 16:24:00,762 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 [2021-12-22 16:24:00,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:24:00,763 INFO L225 Difference]: With dead ends: 84 [2021-12-22 16:24:00,763 INFO L226 Difference]: Without dead ends: 84 [2021-12-22 16:24:00,763 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 [2021-12-22 16:24:00,764 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 [2021-12-22 16:24:00,764 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] [2021-12-22 16:24:00,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-12-22 16:24:00,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 79. [2021-12-22 16:24:00,769 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) [2021-12-22 16:24:00,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 98 transitions. [2021-12-22 16:24:00,770 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 98 transitions. Word has length 29 [2021-12-22 16:24:00,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:24:00,770 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 98 transitions. [2021-12-22 16:24:00,770 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) [2021-12-22 16:24:00,771 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 98 transitions. [2021-12-22 16:24:00,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-22 16:24:00,771 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:24:00,771 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:24:00,786 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-12-22 16:24:00,984 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (10)] Ended with exit code 0 [2021-12-22 16:24:01,182 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 [2021-12-22 16:24:01,182 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting nondet_treeErr3REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-22 16:24:01,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:24:01,183 INFO L85 PathProgramCache]: Analyzing trace with hash -360622957, now seen corresponding path program 1 times [2021-12-22 16:24:01,183 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:24:01,183 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1671017180] [2021-12-22 16:24:01,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:24:01,183 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:24:01,184 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:24:01,184 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) [2021-12-22 16:24:01,185 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-12-22 16:24:01,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:24:01,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-22 16:24:01,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:24:01,365 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 [2021-12-22 16:24:01,370 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 [2021-12-22 16:24:05,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:24:05,688 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 [2021-12-22 16:24:05,702 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-22 16:24:05,702 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 [2021-12-22 16:24:05,729 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-22 16:24:05,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:24:08,016 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:24:08,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1671017180] [2021-12-22 16:24:08,016 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1671017180] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:24:08,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1111958074] [2021-12-22 16:24:08,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:24:08,016 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-22 16:24:08,017 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-22 16:24:08,018 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) [2021-12-22 16:24:08,019 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2021-12-22 16:24:08,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:24:08,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-22 16:24:08,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:24:08,245 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 [2021-12-22 16:24:08,252 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 [2021-12-22 16:24:12,550 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:24:12,554 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 [2021-12-22 16:24:12,566 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-22 16:24:12,566 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 [2021-12-22 16:24:12,574 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-22 16:24:12,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:24:12,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1111958074] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:24:12,808 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:24:12,809 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-12-22 16:24:12,809 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138546383] [2021-12-22 16:24:12,809 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:24:12,809 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-22 16:24:12,809 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:24:12,809 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-22 16:24:12,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=51, Unknown=1, NotChecked=0, Total=72 [2021-12-22 16:24:12,810 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) [2021-12-22 16:24:13,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:24:13,167 INFO L93 Difference]: Finished difference Result 98 states and 130 transitions. [2021-12-22 16:24:13,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-22 16:24:13,168 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 [2021-12-22 16:24:13,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:24:13,169 INFO L225 Difference]: With dead ends: 98 [2021-12-22 16:24:13,170 INFO L226 Difference]: Without dead ends: 98 [2021-12-22 16:24:13,170 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 [2021-12-22 16:24:13,170 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 99 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s 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, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 16:24:13,171 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [103 Valid, 101 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 111 Invalid, 0 Unknown, 92 Unchecked, 0.3s Time] [2021-12-22 16:24:13,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-12-22 16:24:13,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 95. [2021-12-22 16:24:13,187 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) [2021-12-22 16:24:13,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 121 transitions. [2021-12-22 16:24:13,189 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 121 transitions. Word has length 29 [2021-12-22 16:24:13,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:24:13,191 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 121 transitions. [2021-12-22 16:24:13,191 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) [2021-12-22 16:24:13,192 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 121 transitions. [2021-12-22 16:24:13,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-12-22 16:24:13,194 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:24:13,195 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] [2021-12-22 16:24:13,210 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-12-22 16:24:13,408 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (12)] Forceful destruction successful, exit code 0 [2021-12-22 16:24:13,606 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 [2021-12-22 16:24:13,606 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting maxErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-22 16:24:13,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:24:13,607 INFO L85 PathProgramCache]: Analyzing trace with hash -694882647, now seen corresponding path program 1 times [2021-12-22 16:24:13,607 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:24:13,607 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1320079432] [2021-12-22 16:24:13,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:24:13,607 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:24:13,607 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:24:13,608 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) [2021-12-22 16:24:13,609 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-12-22 16:24:13,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:24:13,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-22 16:24:13,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:24:13,701 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 [2021-12-22 16:24:13,862 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-22 16:24:13,862 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:24:14,128 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-22 16:24:14,128 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:24:14,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1320079432] [2021-12-22 16:24:14,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1320079432] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 16:24:14,129 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:24:14,129 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2021-12-22 16:24:14,129 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123428953] [2021-12-22 16:24:14,129 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:24:14,129 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-22 16:24:14,129 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:24:14,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-22 16:24:14,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-12-22 16:24:14,130 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) [2021-12-22 16:24:14,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:24:14,693 INFO L93 Difference]: Finished difference Result 116 states and 148 transitions. [2021-12-22 16:24:14,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-22 16:24:14,694 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 [2021-12-22 16:24:14,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:24:14,695 INFO L225 Difference]: With dead ends: 116 [2021-12-22 16:24:14,695 INFO L226 Difference]: Without dead ends: 114 [2021-12-22 16:24:14,695 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 [2021-12-22 16:24:14,696 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 [2021-12-22 16:24:14,696 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] [2021-12-22 16:24:14,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-12-22 16:24:14,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 108. [2021-12-22 16:24:14,703 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) [2021-12-22 16:24:14,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 141 transitions. [2021-12-22 16:24:14,704 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 141 transitions. Word has length 25 [2021-12-22 16:24:14,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:24:14,704 INFO L470 AbstractCegarLoop]: Abstraction has 108 states and 141 transitions. [2021-12-22 16:24:14,705 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) [2021-12-22 16:24:14,705 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 141 transitions. [2021-12-22 16:24:14,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-12-22 16:24:14,705 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:24:14,706 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] [2021-12-22 16:24:14,718 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-12-22 16:24:14,918 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:24:14,919 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting maxErr1REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-22 16:24:14,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:24:14,919 INFO L85 PathProgramCache]: Analyzing trace with hash -694882646, now seen corresponding path program 1 times [2021-12-22 16:24:14,919 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:24:14,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [299706550] [2021-12-22 16:24:14,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:24:14,920 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:24:14,920 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:24:14,921 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) [2021-12-22 16:24:14,921 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-12-22 16:24:14,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:24:14,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-22 16:24:15,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:24:15,022 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 [2021-12-22 16:24:15,281 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-22 16:24:15,281 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:24:16,549 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-22 16:24:16,549 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:24:16,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [299706550] [2021-12-22 16:24:16,550 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [299706550] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 16:24:16,550 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:24:16,550 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2021-12-22 16:24:16,550 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1124721351] [2021-12-22 16:24:16,550 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:24:16,550 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-22 16:24:16,550 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:24:16,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-22 16:24:16,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2021-12-22 16:24:16,551 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) [2021-12-22 16:24:17,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:24:17,803 INFO L93 Difference]: Finished difference Result 133 states and 176 transitions. [2021-12-22 16:24:17,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-22 16:24:17,805 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 [2021-12-22 16:24:17,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:24:17,805 INFO L225 Difference]: With dead ends: 133 [2021-12-22 16:24:17,806 INFO L226 Difference]: Without dead ends: 133 [2021-12-22 16:24:17,806 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=54, Invalid=288, Unknown=0, NotChecked=0, Total=342 [2021-12-22 16:24:17,807 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 62 mSDsluCounter, 393 mSDsCounter, 0 mSdLazyCounter, 440 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 466 SdHoareTripleChecker+Invalid, 546 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 88 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-12-22 16:24:17,807 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 466 Invalid, 546 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 440 Invalid, 0 Unknown, 88 Unchecked, 1.2s Time] [2021-12-22 16:24:17,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-12-22 16:24:17,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 124. [2021-12-22 16:24:17,813 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) [2021-12-22 16:24:17,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 162 transitions. [2021-12-22 16:24:17,815 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 162 transitions. Word has length 25 [2021-12-22 16:24:17,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:24:17,815 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 162 transitions. [2021-12-22 16:24:17,815 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) [2021-12-22 16:24:17,815 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 162 transitions. [2021-12-22 16:24:17,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-22 16:24:17,816 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:24:17,817 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] [2021-12-22 16:24:17,826 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-12-22 16:24:18,026 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:24:18,026 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting checkErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-22 16:24:18,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:24:18,026 INFO L85 PathProgramCache]: Analyzing trace with hash 986137240, now seen corresponding path program 1 times [2021-12-22 16:24:18,027 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:24:18,027 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [789769402] [2021-12-22 16:24:18,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:24:18,027 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:24:18,027 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:24:18,028 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) [2021-12-22 16:24:18,029 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-12-22 16:24:18,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:24:18,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-22 16:24:18,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:24:18,247 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-22 16:24:18,247 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:24:18,247 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:24:18,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [789769402] [2021-12-22 16:24:18,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [789769402] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:24:18,247 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:24:18,247 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-12-22 16:24:18,247 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [838360128] [2021-12-22 16:24:18,248 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:24:18,248 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-22 16:24:18,248 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:24:18,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-22 16:24:18,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-12-22 16:24:18,249 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) [2021-12-22 16:24:18,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:24:18,446 INFO L93 Difference]: Finished difference Result 130 states and 171 transitions. [2021-12-22 16:24:18,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-22 16:24:18,447 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 [2021-12-22 16:24:18,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:24:18,451 INFO L225 Difference]: With dead ends: 130 [2021-12-22 16:24:18,451 INFO L226 Difference]: Without dead ends: 126 [2021-12-22 16:24:18,451 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 [2021-12-22 16:24:18,452 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 29 mSDsluCounter, 311 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 370 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 16:24:18,452 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] [2021-12-22 16:24:18,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-12-22 16:24:18,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 124. [2021-12-22 16:24:18,465 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) [2021-12-22 16:24:18,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 160 transitions. [2021-12-22 16:24:18,466 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 160 transitions. Word has length 31 [2021-12-22 16:24:18,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:24:18,467 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 160 transitions. [2021-12-22 16:24:18,467 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) [2021-12-22 16:24:18,467 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 160 transitions. [2021-12-22 16:24:18,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-22 16:24:18,468 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:24:18,468 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] [2021-12-22 16:24:18,483 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-12-22 16:24:18,668 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:24:18,669 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting maxErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-22 16:24:18,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:24:18,669 INFO L85 PathProgramCache]: Analyzing trace with hash 1746105865, now seen corresponding path program 1 times [2021-12-22 16:24:18,669 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:24:18,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1882687809] [2021-12-22 16:24:18,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:24:18,670 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:24:18,670 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:24:18,688 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) [2021-12-22 16:24:18,689 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-12-22 16:24:18,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:24:18,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 37 conjunts are in the unsatisfiable core [2021-12-22 16:24:18,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:24:18,861 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 [2021-12-22 16:24:18,871 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 [2021-12-22 16:24:18,982 INFO L353 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-12-22 16:24:18,983 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 [2021-12-22 16:24:18,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:24:18,994 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 [2021-12-22 16:24:19,299 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 [2021-12-22 16:24:19,303 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 [2021-12-22 16:24:19,448 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 16:24:19,448 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:24:20,317 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 16:24:20,317 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:24:20,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1882687809] [2021-12-22 16:24:20,317 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1882687809] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 16:24:20,317 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:24:20,317 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2021-12-22 16:24:20,317 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681210687] [2021-12-22 16:24:20,318 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:24:20,318 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-22 16:24:20,318 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:24:20,318 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-22 16:24:20,318 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2021-12-22 16:24:20,319 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) [2021-12-22 16:24:21,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:24:21,303 INFO L93 Difference]: Finished difference Result 139 states and 178 transitions. [2021-12-22 16:24:21,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-12-22 16:24:21,304 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 [2021-12-22 16:24:21,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:24:21,305 INFO L225 Difference]: With dead ends: 139 [2021-12-22 16:24:21,305 INFO L226 Difference]: Without dead ends: 139 [2021-12-22 16:24:21,305 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-12-22 16:24:21,306 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 38 mSDsluCounter, 750 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s 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, 0.7s IncrementalHoareTripleChecker+Time [2021-12-22 16:24:21,306 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 827 Invalid, 374 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 279 Invalid, 0 Unknown, 83 Unchecked, 0.7s Time] [2021-12-22 16:24:21,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-12-22 16:24:21,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 131. [2021-12-22 16:24:21,310 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) [2021-12-22 16:24:21,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 166 transitions. [2021-12-22 16:24:21,316 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 166 transitions. Word has length 31 [2021-12-22 16:24:21,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:24:21,316 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 166 transitions. [2021-12-22 16:24:21,316 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) [2021-12-22 16:24:21,316 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 166 transitions. [2021-12-22 16:24:21,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-22 16:24:21,317 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:24:21,318 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-12-22 16:24:21,334 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-12-22 16:24:21,529 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:24:21,530 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting nondet_treeErr4REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-22 16:24:21,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:24:21,530 INFO L85 PathProgramCache]: Analyzing trace with hash -1427695233, now seen corresponding path program 1 times [2021-12-22 16:24:21,530 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:24:21,531 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [592853940] [2021-12-22 16:24:21,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:24:21,531 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:24:21,531 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:24:21,532 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) [2021-12-22 16:24:21,533 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-12-22 16:24:21,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:24:21,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-22 16:24:21,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:24:21,688 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 [2021-12-22 16:24:21,931 INFO L353 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-22 16:24:21,932 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 [2021-12-22 16:24:21,940 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-22 16:24:21,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:24:22,085 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:24:22,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [592853940] [2021-12-22 16:24:22,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [592853940] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:24:22,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2062219184] [2021-12-22 16:24:22,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:24:22,086 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-22 16:24:22,086 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-22 16:24:22,088 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) [2021-12-22 16:24:22,089 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-12-22 16:24:22,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:24:22,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-22 16:24:22,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:24:22,277 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 [2021-12-22 16:24:24,408 INFO L353 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-22 16:24:24,408 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 [2021-12-22 16:24:24,416 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-22 16:24:24,416 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:24:24,552 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2062219184] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:24:24,552 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:24:24,552 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-12-22 16:24:24,552 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878599487] [2021-12-22 16:24:24,552 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:24:24,552 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-22 16:24:24,553 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:24:24,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-22 16:24:24,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=27, Unknown=1, NotChecked=0, Total=42 [2021-12-22 16:24:24,553 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) [2021-12-22 16:24:30,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:24:30,800 INFO L93 Difference]: Finished difference Result 133 states and 168 transitions. [2021-12-22 16:24:30,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-22 16:24:30,800 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 [2021-12-22 16:24:30,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:24:30,801 INFO L225 Difference]: With dead ends: 133 [2021-12-22 16:24:30,801 INFO L226 Difference]: Without dead ends: 133 [2021-12-22 16:24:30,802 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 [2021-12-22 16:24:30,802 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 44 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 160 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 16:24:30,802 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] [2021-12-22 16:24:30,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-12-22 16:24:30,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 131. [2021-12-22 16:24:30,806 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) [2021-12-22 16:24:30,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 166 transitions. [2021-12-22 16:24:30,808 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 166 transitions. Word has length 31 [2021-12-22 16:24:30,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:24:30,808 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 166 transitions. [2021-12-22 16:24:30,809 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) [2021-12-22 16:24:30,809 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 166 transitions. [2021-12-22 16:24:30,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-22 16:24:30,809 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:24:30,810 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-12-22 16:24:30,819 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Ended with exit code 0 [2021-12-22 16:24:31,022 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Ended with exit code 0 [2021-12-22 16:24:31,220 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 [2021-12-22 16:24:31,220 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting nondet_treeErr5REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-22 16:24:31,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:24:31,220 INFO L85 PathProgramCache]: Analyzing trace with hash -1427695232, now seen corresponding path program 1 times [2021-12-22 16:24:31,221 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:24:31,221 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [956754453] [2021-12-22 16:24:31,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:24:31,221 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:24:31,221 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:24:31,223 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) [2021-12-22 16:24:31,225 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-12-22 16:24:31,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:24:31,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-22 16:24:31,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:24:31,382 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 [2021-12-22 16:24:31,388 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 [2021-12-22 16:24:35,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:24:35,739 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 [2021-12-22 16:24:35,750 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-22 16:24:35,750 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 [2021-12-22 16:24:35,778 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-22 16:24:35,778 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:24:36,136 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:24:36,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [956754453] [2021-12-22 16:24:36,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [956754453] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:24:36,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [815712747] [2021-12-22 16:24:36,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:24:36,136 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-22 16:24:36,137 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-22 16:24:36,137 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) [2021-12-22 16:24:36,143 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2021-12-22 16:24:36,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:24:36,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-22 16:24:36,301 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:24:36,320 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 [2021-12-22 16:24:36,327 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 [2021-12-22 16:24:42,607 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:24:42,607 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 [2021-12-22 16:24:42,617 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-22 16:24:42,617 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 [2021-12-22 16:24:42,623 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-22 16:24:42,623 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:24:42,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [815712747] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:24:42,782 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:24:42,782 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-12-22 16:24:42,782 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078931764] [2021-12-22 16:24:42,783 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:24:42,783 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-22 16:24:42,783 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:24:42,783 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-22 16:24:42,784 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-12-22 16:24:42,784 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) [2021-12-22 16:24:43,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:24:43,046 INFO L93 Difference]: Finished difference Result 135 states and 176 transitions. [2021-12-22 16:24:43,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-22 16:24:43,048 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 [2021-12-22 16:24:43,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:24:43,049 INFO L225 Difference]: With dead ends: 135 [2021-12-22 16:24:43,049 INFO L226 Difference]: Without dead ends: 135 [2021-12-22 16:24:43,049 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 52 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-12-22 16:24:43,049 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 [2021-12-22 16:24:43,050 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] [2021-12-22 16:24:43,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-12-22 16:24:43,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 131. [2021-12-22 16:24:43,054 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) [2021-12-22 16:24:43,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 166 transitions. [2021-12-22 16:24:43,055 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 166 transitions. Word has length 31 [2021-12-22 16:24:43,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:24:43,055 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 166 transitions. [2021-12-22 16:24:43,055 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) [2021-12-22 16:24:43,055 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 166 transitions. [2021-12-22 16:24:43,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-12-22 16:24:43,060 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:24:43,060 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1] [2021-12-22 16:24:43,063 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (20)] Ended with exit code 0 [2021-12-22 16:24:43,270 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-12-22 16:24:43,463 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 [2021-12-22 16:24:43,463 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-12-22 16:24:43,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:24:43,464 INFO L85 PathProgramCache]: Analyzing trace with hash 1805515892, now seen corresponding path program 2 times [2021-12-22 16:24:43,464 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:24:43,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1500633020] [2021-12-22 16:24:43,464 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-22 16:24:43,464 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:24:43,464 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:24:43,465 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) [2021-12-22 16:24:43,466 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-12-22 16:24:43,666 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-22 16:24:43,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 16:24:43,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-22 16:24:43,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:24:43,695 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 [2021-12-22 16:24:47,943 INFO L353 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2021-12-22 16:24:47,943 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 [2021-12-22 16:24:48,049 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 41 proven. 27 refuted. 3 times theorem prover too weak. 19 trivial. 0 not checked. [2021-12-22 16:24:48,050 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:24:49,361 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:24:49,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1500633020] [2021-12-22 16:24:49,361 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1500633020] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:24:49,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [542992084] [2021-12-22 16:24:49,361 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-22 16:24:49,361 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-22 16:24:49,362 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-22 16:24:49,363 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) [2021-12-22 16:24:49,372 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-12-22 16:24:49,595 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 16:24:49,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [317768975] [2021-12-22 16:24:49,596 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-22 16:24:49,596 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 16:24:49,596 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 16:24:49,599 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 1 [2021-12-22 16:24:49,600 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) [2021-12-22 16:24:49,600 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-12-22 16:24:49,759 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-22 16:24:49,759 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 16:24:49,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-22 16:24:49,766 INFO L286 TraceCheckSpWp]: Computing forward predicates...