./Ultimate.py --spec ../sv-benchmarks/c/properties/valid-memcleanup.prp --file ../sv-benchmarks/c/verifythis/tree_del_rec.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (memcleanup) Using default analysis Version ff03de63 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/verifythis/tree_del_rec.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 448d6e9f7f0c094a8335d652a2766ae983308e33ec1a543ceaed97ae79744722 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-ff03de6 [2021-12-21 17:57:21,408 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-21 17:57:21,410 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-21 17:57:21,435 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-21 17:57:21,435 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-21 17:57:21,437 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-21 17:57:21,439 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-21 17:57:21,441 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-21 17:57:21,442 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-21 17:57:21,443 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-21 17:57:21,443 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-21 17:57:21,444 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-21 17:57:21,445 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-21 17:57:21,450 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-21 17:57:21,452 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-21 17:57:21,453 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-21 17:57:21,455 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-21 17:57:21,456 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-21 17:57:21,457 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-21 17:57:21,458 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-21 17:57:21,458 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-21 17:57:21,459 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-21 17:57:21,460 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-21 17:57:21,460 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-21 17:57:21,462 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-21 17:57:21,462 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-21 17:57:21,462 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-21 17:57:21,463 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-21 17:57:21,463 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-21 17:57:21,464 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-21 17:57:21,464 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-21 17:57:21,464 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-21 17:57:21,465 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-21 17:57:21,465 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-21 17:57:21,466 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-21 17:57:21,466 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-21 17:57:21,467 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-21 17:57:21,467 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-21 17:57:21,467 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-21 17:57:21,468 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-21 17:57:21,468 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-21 17:57:21,469 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-32bit-Automizer_Default.epf [2021-12-21 17:57:21,505 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-21 17:57:21,505 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-21 17:57:21,505 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-21 17:57:21,505 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-21 17:57:21,506 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-21 17:57:21,506 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-21 17:57:21,506 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-21 17:57:21,507 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-21 17:57:21,507 INFO L138 SettingsManager]: * Use SBE=true [2021-12-21 17:57:21,515 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-21 17:57:21,516 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-21 17:57:21,516 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-21 17:57:21,516 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-21 17:57:21,516 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-21 17:57:21,516 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-21 17:57:21,516 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-21 17:57:21,516 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-21 17:57:21,517 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-21 17:57:21,517 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-21 17:57:21,517 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-21 17:57:21,517 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-21 17:57:21,517 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-21 17:57:21,517 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-21 17:57:21,518 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-21 17:57:21,518 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 17:57:21,518 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-21 17:57:21,518 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-21 17:57:21,518 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-21 17:57:21,519 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-21 17:57:21,519 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-21 17:57:21,519 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 448d6e9f7f0c094a8335d652a2766ae983308e33ec1a543ceaed97ae79744722 [2021-12-21 17:57:21,669 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-21 17:57:21,690 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-21 17:57:21,692 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-21 17:57:21,692 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-21 17:57:21,693 INFO L275 PluginConnector]: CDTParser initialized [2021-12-21 17:57:21,694 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/verifythis/tree_del_rec.c [2021-12-21 17:57:21,745 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/438eb9c8d/1b61595e5b454f78b8e3476cc1de3196/FLAG5d6b34cbb [2021-12-21 17:57:22,148 INFO L306 CDTParser]: Found 1 translation units. [2021-12-21 17:57:22,149 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_del_rec.c [2021-12-21 17:57:22,160 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/438eb9c8d/1b61595e5b454f78b8e3476cc1de3196/FLAG5d6b34cbb [2021-12-21 17:57:22,204 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/438eb9c8d/1b61595e5b454f78b8e3476cc1de3196 [2021-12-21 17:57:22,206 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-21 17:57:22,212 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-21 17:57:22,214 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-21 17:57:22,214 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-21 17:57:22,217 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-21 17:57:22,217 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 05:57:22" (1/1) ... [2021-12-21 17:57:22,218 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6901084c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:22, skipping insertion in model container [2021-12-21 17:57:22,218 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 05:57:22" (1/1) ... [2021-12-21 17:57:22,223 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-21 17:57:22,237 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-21 17:57:22,320 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_del_rec.c[585,598] [2021-12-21 17:57:22,330 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-21 17:57:22,332 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-21 17:57:22,343 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 17:57:22,353 ERROR L326 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2021-12-21 17:57:22,353 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@6b6ca651 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:22, skipping insertion in model container [2021-12-21 17:57:22,353 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-21 17:57:22,354 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-12-21 17:57:22,355 INFO L158 Benchmark]: Toolchain (without parser) took 141.91ms. Allocated memory is still 111.1MB. Free memory was 91.6MB in the beginning and 82.1MB in the end (delta: 9.5MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-12-21 17:57:22,355 INFO L158 Benchmark]: CDTParser took 1.06ms. Allocated memory is still 79.7MB. Free memory is still 55.8MB. There was no memory consumed. Max. memory is 16.1GB. [2021-12-21 17:57:22,356 INFO L158 Benchmark]: CACSL2BoogieTranslator took 139.97ms. Allocated memory is still 111.1MB. Free memory was 91.3MB in the beginning and 82.1MB in the end (delta: 9.2MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-12-21 17:57:22,357 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.06ms. Allocated memory is still 79.7MB. Free memory is still 55.8MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 139.97ms. Allocated memory is still 111.1MB. Free memory was 91.3MB in the beginning and 82.1MB in the end (delta: 9.2MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 28]: 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_del_rec.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 448d6e9f7f0c094a8335d652a2766ae983308e33ec1a543ceaed97ae79744722 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-ff03de6 [2021-12-21 17:57:23,834 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-21 17:57:23,835 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-21 17:57:23,864 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-21 17:57:23,865 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-21 17:57:23,866 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-21 17:57:23,867 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-21 17:57:23,868 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-21 17:57:23,869 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-21 17:57:23,870 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-21 17:57:23,871 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-21 17:57:23,871 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-21 17:57:23,872 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-21 17:57:23,872 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-21 17:57:23,873 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-21 17:57:23,874 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-21 17:57:23,875 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-21 17:57:23,875 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-21 17:57:23,877 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-21 17:57:23,878 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-21 17:57:23,879 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-21 17:57:23,880 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-21 17:57:23,881 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-21 17:57:23,881 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-21 17:57:23,883 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-21 17:57:23,883 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-21 17:57:23,884 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-21 17:57:23,884 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-21 17:57:23,885 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-21 17:57:23,885 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-21 17:57:23,885 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-21 17:57:23,886 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-21 17:57:23,886 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-21 17:57:23,887 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-21 17:57:23,888 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-21 17:57:23,888 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-21 17:57:23,888 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-21 17:57:23,889 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-21 17:57:23,889 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-21 17:57:23,889 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-21 17:57:23,890 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-21 17:57:23,891 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-32bit-Automizer_Bitvector.epf [2021-12-21 17:57:23,906 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-21 17:57:23,906 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-21 17:57:23,906 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-21 17:57:23,907 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-21 17:57:23,907 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-21 17:57:23,907 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-21 17:57:23,908 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-21 17:57:23,908 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-21 17:57:23,908 INFO L138 SettingsManager]: * Use SBE=true [2021-12-21 17:57:23,908 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-21 17:57:23,908 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-21 17:57:23,908 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-21 17:57:23,909 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-21 17:57:23,909 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-21 17:57:23,909 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-21 17:57:23,909 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-21 17:57:23,909 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-21 17:57:23,909 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-21 17:57:23,909 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-21 17:57:23,910 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-12-21 17:57:23,910 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-12-21 17:57:23,910 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-21 17:57:23,910 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-21 17:57:23,910 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-21 17:57:23,910 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-21 17:57:23,910 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-21 17:57:23,911 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 17:57:23,911 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-21 17:57:23,911 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-21 17:57:23,911 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2021-12-21 17:57:23,911 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-12-21 17:57:23,911 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-21 17:57:23,911 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-12-21 17:57:23,912 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 448d6e9f7f0c094a8335d652a2766ae983308e33ec1a543ceaed97ae79744722 [2021-12-21 17:57:24,156 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-21 17:57:24,178 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-21 17:57:24,180 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-21 17:57:24,181 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-21 17:57:24,182 INFO L275 PluginConnector]: CDTParser initialized [2021-12-21 17:57:24,183 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/verifythis/tree_del_rec.c [2021-12-21 17:57:24,230 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e8af284f7/09a9914d1bd842fea8d22a06b60e10c9/FLAGc687cceae [2021-12-21 17:57:24,612 INFO L306 CDTParser]: Found 1 translation units. [2021-12-21 17:57:24,612 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_del_rec.c [2021-12-21 17:57:24,617 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e8af284f7/09a9914d1bd842fea8d22a06b60e10c9/FLAGc687cceae [2021-12-21 17:57:24,628 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e8af284f7/09a9914d1bd842fea8d22a06b60e10c9 [2021-12-21 17:57:24,629 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-21 17:57:24,631 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-21 17:57:24,633 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-21 17:57:24,634 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-21 17:57:24,649 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-21 17:57:24,649 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 05:57:24" (1/1) ... [2021-12-21 17:57:24,650 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1b62d7ff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:24, skipping insertion in model container [2021-12-21 17:57:24,650 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 05:57:24" (1/1) ... [2021-12-21 17:57:24,654 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-21 17:57:24,670 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-21 17:57:24,791 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_del_rec.c[585,598] [2021-12-21 17:57:24,807 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-21 17:57:24,809 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-21 17:57:24,859 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 17:57:24,876 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-12-21 17:57:24,884 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-21 17:57:24,892 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_del_rec.c[585,598] [2021-12-21 17:57:24,895 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-21 17:57:24,896 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-21 17:57:24,907 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 17:57:24,918 INFO L203 MainTranslator]: Completed pre-run [2021-12-21 17:57:24,929 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_del_rec.c[585,598] [2021-12-21 17:57:24,937 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-21 17:57:24,939 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-21 17:57:24,953 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 17:57:24,975 INFO L208 MainTranslator]: Completed translation [2021-12-21 17:57:24,975 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:24 WrapperNode [2021-12-21 17:57:24,975 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-21 17:57:24,976 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-21 17:57:24,976 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-21 17:57:24,976 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-21 17:57:24,984 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:24" (1/1) ... [2021-12-21 17:57:24,992 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:24" (1/1) ... [2021-12-21 17:57:25,015 INFO L137 Inliner]: procedures = 31, calls = 61, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 75 [2021-12-21 17:57:25,015 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-21 17:57:25,016 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-21 17:57:25,016 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-21 17:57:25,017 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-21 17:57:25,023 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:24" (1/1) ... [2021-12-21 17:57:25,023 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:24" (1/1) ... [2021-12-21 17:57:25,042 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:24" (1/1) ... [2021-12-21 17:57:25,044 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:24" (1/1) ... [2021-12-21 17:57:25,051 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:24" (1/1) ... [2021-12-21 17:57:25,063 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:24" (1/1) ... [2021-12-21 17:57:25,066 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:24" (1/1) ... [2021-12-21 17:57:25,072 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-21 17:57:25,075 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-21 17:57:25,075 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-21 17:57:25,075 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-21 17:57:25,076 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:24" (1/1) ... [2021-12-21 17:57:25,082 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 17:57:25,089 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 17:57:25,099 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-21 17:57:25,106 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-21 17:57:25,128 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-21 17:57:25,128 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-12-21 17:57:25,129 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-21 17:57:25,129 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-12-21 17:57:25,129 INFO L130 BoogieDeclarations]: Found specification of procedure tree_del [2021-12-21 17:57:25,129 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_del [2021-12-21 17:57:25,129 INFO L130 BoogieDeclarations]: Found specification of procedure min [2021-12-21 17:57:25,129 INFO L138 BoogieDeclarations]: Found implementation of procedure min [2021-12-21 17:57:25,129 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-12-21 17:57:25,129 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2021-12-21 17:57:25,130 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2021-12-21 17:57:25,130 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-12-21 17:57:25,130 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2021-12-21 17:57:25,130 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2021-12-21 17:57:25,130 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-21 17:57:25,130 INFO L130 BoogieDeclarations]: Found specification of procedure size [2021-12-21 17:57:25,130 INFO L138 BoogieDeclarations]: Found implementation of procedure size [2021-12-21 17:57:25,130 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-21 17:57:25,130 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-21 17:57:25,131 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-12-21 17:57:25,131 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-12-21 17:57:25,131 INFO L130 BoogieDeclarations]: Found specification of procedure tree_inorder [2021-12-21 17:57:25,131 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_inorder [2021-12-21 17:57:25,131 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-21 17:57:25,131 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-12-21 17:57:25,256 INFO L234 CfgBuilder]: Building ICFG [2021-12-21 17:57:25,257 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-21 17:57:25,737 INFO L275 CfgBuilder]: Performing block encoding [2021-12-21 17:57:25,743 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-21 17:57:25,743 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-12-21 17:57:25,745 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 05:57:25 BoogieIcfgContainer [2021-12-21 17:57:25,745 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-21 17:57:25,746 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-21 17:57:25,746 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-21 17:57:25,748 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-21 17:57:25,748 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 05:57:24" (1/3) ... [2021-12-21 17:57:25,749 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@305820ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 05:57:25, skipping insertion in model container [2021-12-21 17:57:25,749 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 05:57:24" (2/3) ... [2021-12-21 17:57:25,749 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@305820ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 05:57:25, skipping insertion in model container [2021-12-21 17:57:25,749 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 05:57:25" (3/3) ... [2021-12-21 17:57:25,750 INFO L111 eAbstractionObserver]: Analyzing ICFG tree_del_rec.c [2021-12-21 17:57:25,754 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-21 17:57:25,754 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 55 error locations. [2021-12-21 17:57:25,792 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-21 17:57:25,798 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-21 17:57:25,799 INFO L340 AbstractCegarLoop]: Starting to check reachability of 55 error locations. [2021-12-21 17:57:25,825 INFO L276 IsEmpty]: Start isEmpty. Operand has 174 states, 89 states have (on average 1.7640449438202248) internal successors, (157), 144 states have internal predecessors, (157), 22 states have call successors, (22), 7 states have call predecessors, (22), 7 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-21 17:57:25,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-12-21 17:57:25,831 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:25,831 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-12-21 17:57:25,832 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting nondet_treeErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-21 17:57:25,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:57:25,836 INFO L85 PathProgramCache]: Analyzing trace with hash 120433579, now seen corresponding path program 1 times [2021-12-21 17:57:25,844 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:57:25,845 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1666059674] [2021-12-21 17:57:25,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:25,846 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:57:25,846 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:57:25,851 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:57:25,857 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-12-21 17:57:25,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:25,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-21 17:57:25,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:25,978 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:57:25,986 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 17:57:25,986 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 17:57:25,987 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:57:25,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1666059674] [2021-12-21 17:57:25,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1666059674] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 17:57:25,987 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 17:57:25,988 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-21 17:57:25,989 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537444021] [2021-12-21 17:57:25,990 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 17:57:25,993 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-21 17:57:25,994 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:57:26,016 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-21 17:57:26,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-21 17:57:26,021 INFO L87 Difference]: Start difference. First operand has 174 states, 89 states have (on average 1.7640449438202248) internal successors, (157), 144 states have internal predecessors, (157), 22 states have call successors, (22), 7 states have call predecessors, (22), 7 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 17:57:26,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:57:26,224 INFO L93 Difference]: Finished difference Result 175 states and 200 transitions. [2021-12-21 17:57:26,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-21 17:57:26,226 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-12-21 17:57:26,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:57:26,234 INFO L225 Difference]: With dead ends: 175 [2021-12-21 17:57:26,234 INFO L226 Difference]: Without dead ends: 172 [2021-12-21 17:57:26,236 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-21 17:57:26,242 INFO L933 BasicCegarLoop]: 197 mSDtfsCounter, 6 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 17:57:26,243 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 326 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 17:57:26,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-12-21 17:57:26,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 170. [2021-12-21 17:57:26,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 87 states have (on average 1.7011494252873562) internal successors, (148), 140 states have internal predecessors, (148), 22 states have call successors, (22), 7 states have call predecessors, (22), 7 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-21 17:57:26,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 192 transitions. [2021-12-21 17:57:26,306 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 192 transitions. Word has length 5 [2021-12-21 17:57:26,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:57:26,307 INFO L470 AbstractCegarLoop]: Abstraction has 170 states and 192 transitions. [2021-12-21 17:57:26,307 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 17:57:26,307 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 192 transitions. [2021-12-21 17:57:26,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-12-21 17:57:26,309 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:26,309 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-12-21 17:57:26,317 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Ended with exit code 0 [2021-12-21 17:57:26,526 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 17:57:26,526 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting nondet_treeErr1REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-21 17:57:26,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:57:26,527 INFO L85 PathProgramCache]: Analyzing trace with hash 120433580, now seen corresponding path program 1 times [2021-12-21 17:57:26,527 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:57:26,527 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [776868190] [2021-12-21 17:57:26,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:26,527 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:57:26,528 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:57:26,529 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:57:26,529 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-12-21 17:57:26,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:26,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-21 17:57:26,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:26,604 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:57:26,618 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 17:57:26,618 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 17:57:26,618 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:57:26,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [776868190] [2021-12-21 17:57:26,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [776868190] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 17:57:26,619 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 17:57:26,619 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-21 17:57:26,619 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924051014] [2021-12-21 17:57:26,619 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 17:57:26,621 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-21 17:57:26,621 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:57:26,621 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-21 17:57:26,623 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-21 17:57:26,623 INFO L87 Difference]: Start difference. First operand 170 states and 192 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 17:57:26,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:57:26,786 INFO L93 Difference]: Finished difference Result 169 states and 191 transitions. [2021-12-21 17:57:26,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-21 17:57:26,787 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-12-21 17:57:26,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:57:26,788 INFO L225 Difference]: With dead ends: 169 [2021-12-21 17:57:26,789 INFO L226 Difference]: Without dead ends: 169 [2021-12-21 17:57:26,789 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-21 17:57:26,789 INFO L933 BasicCegarLoop]: 190 mSDtfsCounter, 2 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 327 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 17:57:26,790 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 327 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 17:57:26,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-12-21 17:57:26,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2021-12-21 17:57:26,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 87 states have (on average 1.6896551724137931) internal successors, (147), 139 states have internal predecessors, (147), 22 states have call successors, (22), 7 states have call predecessors, (22), 7 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-21 17:57:26,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 191 transitions. [2021-12-21 17:57:26,798 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 191 transitions. Word has length 5 [2021-12-21 17:57:26,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:57:26,798 INFO L470 AbstractCegarLoop]: Abstraction has 169 states and 191 transitions. [2021-12-21 17:57:26,798 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 17:57:26,798 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 191 transitions. [2021-12-21 17:57:26,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-21 17:57:26,799 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:26,799 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 17:57:26,805 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-12-21 17:57:27,005 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 17:57:27,007 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting minErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-21 17:57:27,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:57:27,008 INFO L85 PathProgramCache]: Analyzing trace with hash 854953177, now seen corresponding path program 1 times [2021-12-21 17:57:27,008 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:57:27,008 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1282340305] [2021-12-21 17:57:27,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:27,008 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:57:27,008 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:57:27,009 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:57:27,011 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-12-21 17:57:27,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:27,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-21 17:57:27,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:27,152 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 17:57:27,152 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 17:57:27,153 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:57:27,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1282340305] [2021-12-21 17:57:27,153 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1282340305] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 17:57:27,153 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 17:57:27,153 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-21 17:57:27,153 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215944978] [2021-12-21 17:57:27,153 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 17:57:27,154 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-21 17:57:27,154 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:57:27,154 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-21 17:57:27,154 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-21 17:57:27,155 INFO L87 Difference]: Start difference. First operand 169 states and 191 transitions. Second operand has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 17:57:27,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:57:27,261 INFO L93 Difference]: Finished difference Result 233 states and 270 transitions. [2021-12-21 17:57:27,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-21 17:57:27,262 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-12-21 17:57:27,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:57:27,264 INFO L225 Difference]: With dead ends: 233 [2021-12-21 17:57:27,264 INFO L226 Difference]: Without dead ends: 233 [2021-12-21 17:57:27,266 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-12-21 17:57:27,268 INFO L933 BasicCegarLoop]: 199 mSDtfsCounter, 91 mSDsluCounter, 957 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 1156 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 17:57:27,270 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 1156 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 17:57:27,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2021-12-21 17:57:27,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 177. [2021-12-21 17:57:27,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 92 states have (on average 1.6521739130434783) internal successors, (152), 145 states have internal predecessors, (152), 23 states have call successors, (23), 8 states have call predecessors, (23), 9 states have return successors, (26), 23 states have call predecessors, (26), 23 states have call successors, (26) [2021-12-21 17:57:27,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 201 transitions. [2021-12-21 17:57:27,288 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 201 transitions. Word has length 11 [2021-12-21 17:57:27,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:57:27,289 INFO L470 AbstractCegarLoop]: Abstraction has 177 states and 201 transitions. [2021-12-21 17:57:27,289 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 17:57:27,289 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 201 transitions. [2021-12-21 17:57:27,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-21 17:57:27,290 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:27,290 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 17:57:27,297 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-12-21 17:57:27,496 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 17:57:27,496 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-21 17:57:27,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:57:27,497 INFO L85 PathProgramCache]: Analyzing trace with hash 873486780, now seen corresponding path program 1 times [2021-12-21 17:57:27,497 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:57:27,497 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1901335140] [2021-12-21 17:57:27,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:27,497 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:57:27,497 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:57:27,498 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:57:27,499 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-12-21 17:57:27,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:27,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-21 17:57:27,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:27,562 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:57:27,589 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 17:57:27,589 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 17:57:27,589 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:57:27,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1901335140] [2021-12-21 17:57:27,589 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1901335140] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 17:57:27,589 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 17:57:27,590 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-21 17:57:27,590 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839590599] [2021-12-21 17:57:27,590 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 17:57:27,590 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 17:57:27,590 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:57:27,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 17:57:27,591 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-21 17:57:27,591 INFO L87 Difference]: Start difference. First operand 177 states and 201 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 17:57:27,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:57:27,893 INFO L93 Difference]: Finished difference Result 181 states and 205 transitions. [2021-12-21 17:57:27,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-21 17:57:27,894 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-12-21 17:57:27,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:57:27,895 INFO L225 Difference]: With dead ends: 181 [2021-12-21 17:57:27,895 INFO L226 Difference]: Without dead ends: 181 [2021-12-21 17:57:27,895 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-21 17:57:27,896 INFO L933 BasicCegarLoop]: 150 mSDtfsCounter, 89 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 247 SdHoareTripleChecker+Invalid, 241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-21 17:57:27,896 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 247 Invalid, 241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 216 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-21 17:57:27,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2021-12-21 17:57:27,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 179. [2021-12-21 17:57:27,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 94 states have (on average 1.6595744680851063) internal successors, (156), 145 states have internal predecessors, (156), 23 states have call successors, (23), 8 states have call predecessors, (23), 9 states have return successors, (26), 25 states have call predecessors, (26), 23 states have call successors, (26) [2021-12-21 17:57:27,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 205 transitions. [2021-12-21 17:57:27,902 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 205 transitions. Word has length 11 [2021-12-21 17:57:27,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:57:27,902 INFO L470 AbstractCegarLoop]: Abstraction has 179 states and 205 transitions. [2021-12-21 17:57:27,903 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 17:57:27,903 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 205 transitions. [2021-12-21 17:57:27,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-21 17:57:27,903 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:27,903 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 17:57:27,910 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-12-21 17:57:28,109 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 17:57:28,110 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting nondet_treeErr3REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-21 17:57:28,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:57:28,110 INFO L85 PathProgramCache]: Analyzing trace with hash 873486781, now seen corresponding path program 1 times [2021-12-21 17:57:28,110 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:57:28,110 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [876514038] [2021-12-21 17:57:28,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:28,110 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:57:28,111 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:57:28,111 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:57:28,113 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-12-21 17:57:28,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:28,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-21 17:57:28,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:28,233 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:57:28,269 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 17:57:28,269 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 17:57:28,269 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:57:28,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [876514038] [2021-12-21 17:57:28,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [876514038] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 17:57:28,270 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 17:57:28,270 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-21 17:57:28,270 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2113932810] [2021-12-21 17:57:28,270 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 17:57:28,271 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 17:57:28,271 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:57:28,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 17:57:28,271 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-21 17:57:28,271 INFO L87 Difference]: Start difference. First operand 179 states and 205 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 17:57:28,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:57:28,631 INFO L93 Difference]: Finished difference Result 185 states and 215 transitions. [2021-12-21 17:57:28,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-21 17:57:28,632 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-12-21 17:57:28,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:57:28,633 INFO L225 Difference]: With dead ends: 185 [2021-12-21 17:57:28,633 INFO L226 Difference]: Without dead ends: 185 [2021-12-21 17:57:28,633 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-21 17:57:28,634 INFO L933 BasicCegarLoop]: 153 mSDtfsCounter, 93 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 224 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 224 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-21 17:57:28,634 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 242 Invalid, 248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 224 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-21 17:57:28,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-12-21 17:57:28,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 182. [2021-12-21 17:57:28,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 96 states have (on average 1.6354166666666667) internal successors, (157), 147 states have internal predecessors, (157), 24 states have call successors, (24), 8 states have call predecessors, (24), 9 states have return successors, (28), 26 states have call predecessors, (28), 24 states have call successors, (28) [2021-12-21 17:57:28,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 209 transitions. [2021-12-21 17:57:28,640 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 209 transitions. Word has length 11 [2021-12-21 17:57:28,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:57:28,640 INFO L470 AbstractCegarLoop]: Abstraction has 182 states and 209 transitions. [2021-12-21 17:57:28,640 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 17:57:28,640 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 209 transitions. [2021-12-21 17:57:28,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-12-21 17:57:28,641 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:28,641 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 17:57:28,649 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-12-21 17:57:28,847 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 17:57:28,847 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting sizeErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-21 17:57:28,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:57:28,848 INFO L85 PathProgramCache]: Analyzing trace with hash -1280810199, now seen corresponding path program 1 times [2021-12-21 17:57:28,848 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:57:28,848 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [33336385] [2021-12-21 17:57:28,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:28,848 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:57:28,848 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:57:28,849 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:57:28,850 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-12-21 17:57:28,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:28,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-21 17:57:28,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:28,980 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 17:57:28,981 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 17:57:28,981 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:57:28,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [33336385] [2021-12-21 17:57:28,981 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [33336385] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 17:57:28,981 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 17:57:28,981 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-21 17:57:28,982 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086419612] [2021-12-21 17:57:28,982 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 17:57:28,982 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-21 17:57:28,982 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:57:28,982 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-21 17:57:28,983 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-21 17:57:28,983 INFO L87 Difference]: Start difference. First operand 182 states and 209 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-21 17:57:29,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:57:29,065 INFO L93 Difference]: Finished difference Result 242 states and 282 transitions. [2021-12-21 17:57:29,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-21 17:57:29,065 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2021-12-21 17:57:29,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:57:29,066 INFO L225 Difference]: With dead ends: 242 [2021-12-21 17:57:29,066 INFO L226 Difference]: Without dead ends: 242 [2021-12-21 17:57:29,067 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-12-21 17:57:29,067 INFO L933 BasicCegarLoop]: 198 mSDtfsCounter, 90 mSDsluCounter, 956 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 1154 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 17:57:29,067 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 1154 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 17:57:29,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2021-12-21 17:57:29,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 204. [2021-12-21 17:57:29,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 110 states have (on average 1.5909090909090908) internal successors, (175), 161 states have internal predecessors, (175), 31 states have call successors, (31), 9 states have call predecessors, (31), 10 states have return successors, (35), 33 states have call predecessors, (35), 31 states have call successors, (35) [2021-12-21 17:57:29,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 241 transitions. [2021-12-21 17:57:29,073 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 241 transitions. Word has length 17 [2021-12-21 17:57:29,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:57:29,073 INFO L470 AbstractCegarLoop]: Abstraction has 204 states and 241 transitions. [2021-12-21 17:57:29,073 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-21 17:57:29,074 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 241 transitions. [2021-12-21 17:57:29,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-21 17:57:29,074 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:29,074 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 17:57:29,087 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-12-21 17:57:29,274 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 17:57:29,275 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-21 17:57:29,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:57:29,275 INFO L85 PathProgramCache]: Analyzing trace with hash -1539264760, now seen corresponding path program 1 times [2021-12-21 17:57:29,276 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:57:29,276 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [787155306] [2021-12-21 17:57:29,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:29,276 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:57:29,276 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:57:29,277 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:57:29,278 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-12-21 17:57:29,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:29,419 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-21 17:57:29,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:29,433 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:57:29,607 INFO L353 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-21 17:57:29,608 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 18 treesize of output 25 [2021-12-21 17:57:29,616 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-21 17:57:29,617 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 17:57:29,753 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:57:29,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [787155306] [2021-12-21 17:57:29,754 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [787155306] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 17:57:29,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [547789638] [2021-12-21 17:57:29,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:29,754 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-21 17:57:29,754 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-21 17:57:29,756 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-21 17:57:29,774 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2021-12-21 17:57:29,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:29,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-21 17:57:29,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:29,936 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:57:32,057 INFO L353 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-21 17:57:32,057 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 17 [2021-12-21 17:57:32,063 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-21 17:57:32,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 17:57:32,171 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [547789638] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 17:57:32,171 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 17:57:32,172 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-12-21 17:57:32,172 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927736661] [2021-12-21 17:57:32,172 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 17:57:32,172 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-21 17:57:32,172 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:57:32,173 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-21 17:57:32,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=27, Unknown=1, NotChecked=0, Total=42 [2021-12-21 17:57:32,173 INFO L87 Difference]: Start difference. First operand 204 states and 241 transitions. Second operand has 6 states, 5 states have (on average 5.4) internal successors, (27), 6 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-21 17:57:38,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:57:38,517 INFO L93 Difference]: Finished difference Result 210 states and 249 transitions. [2021-12-21 17:57:38,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 17:57:38,518 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.4) internal successors, (27), 6 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 29 [2021-12-21 17:57:38,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:57:38,519 INFO L225 Difference]: With dead ends: 210 [2021-12-21 17:57:38,519 INFO L226 Difference]: Without dead ends: 210 [2021-12-21 17:57:38,519 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 58 SyntacticMatches, 7 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=26, Invalid=44, Unknown=2, NotChecked=0, Total=72 [2021-12-21 17:57:38,520 INFO L933 BasicCegarLoop]: 152 mSDtfsCounter, 86 mSDsluCounter, 206 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 358 SdHoareTripleChecker+Invalid, 517 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 291 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-21 17:57:38,520 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 358 Invalid, 517 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 203 Invalid, 0 Unknown, 291 Unchecked, 0.3s Time] [2021-12-21 17:57:38,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2021-12-21 17:57:38,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 208. [2021-12-21 17:57:38,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 113 states have (on average 1.584070796460177) internal successors, (179), 164 states have internal predecessors, (179), 31 states have call successors, (31), 9 states have call predecessors, (31), 11 states have return successors, (39), 34 states have call predecessors, (39), 31 states have call successors, (39) [2021-12-21 17:57:38,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 249 transitions. [2021-12-21 17:57:38,526 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 249 transitions. Word has length 29 [2021-12-21 17:57:38,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:57:38,526 INFO L470 AbstractCegarLoop]: Abstraction has 208 states and 249 transitions. [2021-12-21 17:57:38,526 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.4) internal successors, (27), 6 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-21 17:57:38,526 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 249 transitions. [2021-12-21 17:57:38,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-12-21 17:57:38,526 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:38,527 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 17:57:38,532 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (9)] Forceful destruction successful, exit code 0 [2021-12-21 17:57:38,740 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-12-21 17:57:38,937 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 17:57:38,937 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting nondet_treeErr3REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-21 17:57:38,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:57:38,938 INFO L85 PathProgramCache]: Analyzing trace with hash 1070284721, now seen corresponding path program 1 times [2021-12-21 17:57:38,938 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:57:38,938 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [71441293] [2021-12-21 17:57:38,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:38,938 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:57:38,938 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:57:38,939 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:57:38,940 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-12-21 17:57:39,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:39,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-21 17:57:39,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:39,061 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:57:39,066 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:57:45,326 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 17:57:45,327 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-21 17:57:45,343 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-21 17:57:45,343 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 12 [2021-12-21 17:57:45,358 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 17:57:45,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 17:57:45,522 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:57:45,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [71441293] [2021-12-21 17:57:45,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [71441293] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 17:57:45,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [56816263] [2021-12-21 17:57:45,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:45,522 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-21 17:57:45,522 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-21 17:57:45,523 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-21 17:57:45,524 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2021-12-21 17:57:45,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:45,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-21 17:57:45,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:45,669 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:57:45,676 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:57:51,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 17:57:51,884 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-21 17:57:51,891 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-21 17:57:51,892 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 12 [2021-12-21 17:57:51,897 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 17:57:51,898 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 17:57:52,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [56816263] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 17:57:52,123 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 17:57:52,123 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-12-21 17:57:52,123 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [999953441] [2021-12-21 17:57:52,123 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 17:57:52,123 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-21 17:57:52,123 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:57:52,124 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-21 17:57:52,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=51, Unknown=1, NotChecked=0, Total=72 [2021-12-21 17:57:52,124 INFO L87 Difference]: Start difference. First operand 208 states and 249 transitions. Second operand has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-21 17:57:52,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:57:52,690 INFO L93 Difference]: Finished difference Result 227 states and 281 transitions. [2021-12-21 17:57:52,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-21 17:57:52,691 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 25 [2021-12-21 17:57:52,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:57:52,692 INFO L225 Difference]: With dead ends: 227 [2021-12-21 17:57:52,692 INFO L226 Difference]: Without dead ends: 227 [2021-12-21 17:57:52,692 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 40 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=27, Invalid=62, Unknown=1, NotChecked=0, Total=90 [2021-12-21 17:57:52,693 INFO L933 BasicCegarLoop]: 144 mSDtfsCounter, 102 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 296 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 514 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 185 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-21 17:57:52,693 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 310 Invalid, 514 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 296 Invalid, 0 Unknown, 185 Unchecked, 0.5s Time] [2021-12-21 17:57:52,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-12-21 17:57:52,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 224. [2021-12-21 17:57:52,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 124 states have (on average 1.532258064516129) internal successors, (190), 176 states have internal predecessors, (190), 34 states have call successors, (34), 10 states have call predecessors, (34), 13 states have return successors, (48), 37 states have call predecessors, (48), 34 states have call successors, (48) [2021-12-21 17:57:52,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 272 transitions. [2021-12-21 17:57:52,703 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 272 transitions. Word has length 25 [2021-12-21 17:57:52,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:57:52,703 INFO L470 AbstractCegarLoop]: Abstraction has 224 states and 272 transitions. [2021-12-21 17:57:52,703 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-21 17:57:52,703 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 272 transitions. [2021-12-21 17:57:52,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-12-21 17:57:52,706 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:52,707 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 17:57:52,712 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2021-12-21 17:57:52,923 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-12-21 17:57:53,117 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 17:57:53,117 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting minErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-21 17:57:53,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:57:53,117 INFO L85 PathProgramCache]: Analyzing trace with hash -1668050227, now seen corresponding path program 1 times [2021-12-21 17:57:53,117 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:57:53,118 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [582157994] [2021-12-21 17:57:53,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:53,118 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:57:53,118 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:57:53,119 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:57:53,119 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-12-21 17:57:53,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:53,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-21 17:57:53,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:53,206 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:57:53,297 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 17:57:53,298 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 17:57:53,465 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 17:57:53,466 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:57:53,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [582157994] [2021-12-21 17:57:53,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [582157994] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 17:57:53,466 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 17:57:53,466 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2021-12-21 17:57:53,466 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927997465] [2021-12-21 17:57:53,466 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 17:57:53,466 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-21 17:57:53,466 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:57:53,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-21 17:57:53,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-12-21 17:57:53,467 INFO L87 Difference]: Start difference. First operand 224 states and 272 transitions. Second operand has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-21 17:57:54,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:57:54,496 INFO L93 Difference]: Finished difference Result 244 states and 296 transitions. [2021-12-21 17:57:54,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-21 17:57:54,497 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 25 [2021-12-21 17:57:54,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:57:54,498 INFO L225 Difference]: With dead ends: 244 [2021-12-21 17:57:54,498 INFO L226 Difference]: Without dead ends: 244 [2021-12-21 17:57:54,498 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-12-21 17:57:54,499 INFO L933 BasicCegarLoop]: 162 mSDtfsCounter, 158 mSDsluCounter, 507 mSDsCounter, 0 mSdLazyCounter, 982 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 162 SdHoareTripleChecker+Valid, 669 SdHoareTripleChecker+Invalid, 1090 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 982 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 55 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-12-21 17:57:54,499 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [162 Valid, 669 Invalid, 1090 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 982 Invalid, 0 Unknown, 55 Unchecked, 1.0s Time] [2021-12-21 17:57:54,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-12-21 17:57:54,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 236. [2021-12-21 17:57:54,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 236 states, 135 states have (on average 1.5185185185185186) internal successors, (205), 185 states have internal predecessors, (205), 36 states have call successors, (36), 11 states have call predecessors, (36), 14 states have return successors, (50), 39 states have call predecessors, (50), 36 states have call successors, (50) [2021-12-21 17:57:54,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 291 transitions. [2021-12-21 17:57:54,507 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 291 transitions. Word has length 25 [2021-12-21 17:57:54,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:57:54,508 INFO L470 AbstractCegarLoop]: Abstraction has 236 states and 291 transitions. [2021-12-21 17:57:54,508 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-21 17:57:54,509 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 291 transitions. [2021-12-21 17:57:54,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-12-21 17:57:54,510 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:54,511 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 17:57:54,521 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-12-21 17:57:54,717 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 17:57:54,718 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting minErr1REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-21 17:57:54,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:57:54,718 INFO L85 PathProgramCache]: Analyzing trace with hash -1668050226, now seen corresponding path program 1 times [2021-12-21 17:57:54,718 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:57:54,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [680690384] [2021-12-21 17:57:54,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:54,719 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:57:54,719 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:57:54,720 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:57:54,721 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-12-21 17:57:54,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:54,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-21 17:57:54,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:54,807 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:57:54,951 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 17:57:54,951 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 17:57:55,813 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 17:57:55,814 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:57:55,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [680690384] [2021-12-21 17:57:55,814 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [680690384] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 17:57:55,814 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 17:57:55,814 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2021-12-21 17:57:55,814 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759013853] [2021-12-21 17:57:55,814 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 17:57:55,814 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-21 17:57:55,814 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:57:55,815 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-21 17:57:55,815 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2021-12-21 17:57:55,815 INFO L87 Difference]: Start difference. First operand 236 states and 291 transitions. Second operand has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-21 17:57:58,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:57:58,907 INFO L93 Difference]: Finished difference Result 261 states and 327 transitions. [2021-12-21 17:57:58,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-21 17:57:58,907 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 25 [2021-12-21 17:57:58,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:57:58,908 INFO L225 Difference]: With dead ends: 261 [2021-12-21 17:57:58,909 INFO L226 Difference]: Without dead ends: 261 [2021-12-21 17:57:58,909 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=74, Invalid=388, Unknown=0, NotChecked=0, Total=462 [2021-12-21 17:57:58,909 INFO L933 BasicCegarLoop]: 156 mSDtfsCounter, 143 mSDsluCounter, 573 mSDsCounter, 0 mSdLazyCounter, 1482 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 729 SdHoareTripleChecker+Invalid, 1573 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 1482 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 47 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2021-12-21 17:57:58,909 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [148 Valid, 729 Invalid, 1573 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 1482 Invalid, 0 Unknown, 47 Unchecked, 2.9s Time] [2021-12-21 17:57:58,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2021-12-21 17:57:58,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 252. [2021-12-21 17:57:58,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 147 states have (on average 1.4965986394557824) internal successors, (220), 197 states have internal predecessors, (220), 39 states have call successors, (39), 12 states have call predecessors, (39), 15 states have return successors, (53), 42 states have call predecessors, (53), 39 states have call successors, (53) [2021-12-21 17:57:58,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 312 transitions. [2021-12-21 17:57:58,917 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 312 transitions. Word has length 25 [2021-12-21 17:57:58,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:57:58,918 INFO L470 AbstractCegarLoop]: Abstraction has 252 states and 312 transitions. [2021-12-21 17:57:58,918 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-21 17:57:58,918 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 312 transitions. [2021-12-21 17:57:58,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-12-21 17:57:58,920 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:58,920 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 17:57:58,951 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-12-21 17:57:59,125 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 17:57:59,125 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting tree_inorderErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-21 17:57:59,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:57:59,126 INFO L85 PathProgramCache]: Analyzing trace with hash 369889479, now seen corresponding path program 1 times [2021-12-21 17:57:59,126 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:57:59,126 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1578403097] [2021-12-21 17:57:59,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:59,126 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:57:59,126 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:57:59,127 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:57:59,128 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-12-21 17:57:59,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:59,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-21 17:57:59,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:59,222 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 17:57:59,222 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 17:57:59,223 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:57:59,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1578403097] [2021-12-21 17:57:59,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1578403097] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 17:57:59,223 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 17:57:59,223 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-21 17:57:59,223 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [724789819] [2021-12-21 17:57:59,223 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 17:57:59,224 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 17:57:59,224 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:57:59,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 17:57:59,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-21 17:57:59,224 INFO L87 Difference]: Start difference. First operand 252 states and 312 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-21 17:57:59,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:57:59,238 INFO L93 Difference]: Finished difference Result 242 states and 293 transitions. [2021-12-21 17:57:59,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-21 17:57:59,239 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (5), 2 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 30 [2021-12-21 17:57:59,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:57:59,240 INFO L225 Difference]: With dead ends: 242 [2021-12-21 17:57:59,240 INFO L226 Difference]: Without dead ends: 226 [2021-12-21 17:57:59,240 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-21 17:57:59,240 INFO L933 BasicCegarLoop]: 188 mSDtfsCounter, 0 mSDsluCounter, 560 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 748 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 17:57:59,241 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 748 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 17:57:59,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2021-12-21 17:57:59,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 226. [2021-12-21 17:57:59,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 130 states have (on average 1.5307692307692307) internal successors, (199), 181 states have internal predecessors, (199), 31 states have call successors, (31), 10 states have call predecessors, (31), 14 states have return successors, (47), 34 states have call predecessors, (47), 31 states have call successors, (47) [2021-12-21 17:57:59,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 277 transitions. [2021-12-21 17:57:59,246 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 277 transitions. Word has length 30 [2021-12-21 17:57:59,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:57:59,247 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 277 transitions. [2021-12-21 17:57:59,247 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-21 17:57:59,247 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 277 transitions. [2021-12-21 17:57:59,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-21 17:57:59,247 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:59,248 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 17:57:59,271 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-12-21 17:57:59,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 17:57:59,458 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting sizeErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-21 17:57:59,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:57:59,458 INFO L85 PathProgramCache]: Analyzing trace with hash -648076771, now seen corresponding path program 1 times [2021-12-21 17:57:59,458 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:57:59,459 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1670573727] [2021-12-21 17:57:59,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:57:59,459 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:57:59,459 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:57:59,460 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:57:59,461 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-12-21 17:57:59,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:57:59,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-21 17:57:59,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:57:59,631 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-21 17:57:59,632 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 17:57:59,632 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:57:59,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1670573727] [2021-12-21 17:57:59,632 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1670573727] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 17:57:59,632 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 17:57:59,632 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-12-21 17:57:59,632 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302742078] [2021-12-21 17:57:59,632 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 17:57:59,633 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-21 17:57:59,633 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:57:59,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-21 17:57:59,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-12-21 17:57:59,633 INFO L87 Difference]: Start difference. First operand 226 states and 277 transitions. Second operand has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-21 17:57:59,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:57:59,806 INFO L93 Difference]: Finished difference Result 232 states and 286 transitions. [2021-12-21 17:57:59,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-21 17:57:59,807 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 31 [2021-12-21 17:57:59,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:57:59,808 INFO L225 Difference]: With dead ends: 232 [2021-12-21 17:57:59,808 INFO L226 Difference]: Without dead ends: 228 [2021-12-21 17:57:59,808 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-12-21 17:57:59,809 INFO L933 BasicCegarLoop]: 171 mSDtfsCounter, 109 mSDsluCounter, 883 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 1054 SdHoareTripleChecker+Invalid, 164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 17:57:59,809 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [113 Valid, 1054 Invalid, 164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 140 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 17:57:59,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2021-12-21 17:57:59,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 226. [2021-12-21 17:57:59,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 130 states have (on average 1.5153846153846153) internal successors, (197), 181 states have internal predecessors, (197), 31 states have call successors, (31), 10 states have call predecessors, (31), 14 states have return successors, (47), 34 states have call predecessors, (47), 31 states have call successors, (47) [2021-12-21 17:57:59,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 275 transitions. [2021-12-21 17:57:59,815 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 275 transitions. Word has length 31 [2021-12-21 17:57:59,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:57:59,815 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 275 transitions. [2021-12-21 17:57:59,815 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-21 17:57:59,816 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 275 transitions. [2021-12-21 17:57:59,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-21 17:57:59,816 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:57:59,816 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 17:57:59,839 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Ended with exit code 0 [2021-12-21 17:58:00,027 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 17:58:00,028 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting minErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-21 17:58:00,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:58:00,028 INFO L85 PathProgramCache]: Analyzing trace with hash -2088825952, now seen corresponding path program 1 times [2021-12-21 17:58:00,028 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:58:00,028 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1589544023] [2021-12-21 17:58:00,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:58:00,029 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:58:00,029 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:58:00,030 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:58:00,031 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-12-21 17:58:00,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:58:00,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 37 conjunts are in the unsatisfiable core [2021-12-21 17:58:00,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:58:00,166 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-21 17:58:00,172 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-21 17:58:00,236 INFO L353 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-12-21 17:58:00,237 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-12-21 17:58:00,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 17:58:00,243 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-12-21 17:58:00,413 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-12-21 17:58:00,416 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-12-21 17:58:00,484 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 17:58:00,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 17:58:01,109 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 17:58:01,109 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:58:01,109 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1589544023] [2021-12-21 17:58:01,109 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1589544023] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 17:58:01,109 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 17:58:01,109 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2021-12-21 17:58:01,110 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [327377068] [2021-12-21 17:58:01,110 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 17:58:01,110 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-21 17:58:01,110 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:58:01,110 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-21 17:58:01,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2021-12-21 17:58:01,110 INFO L87 Difference]: Start difference. First operand 226 states and 275 transitions. Second operand has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 4 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-21 17:58:01,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:58:01,875 INFO L93 Difference]: Finished difference Result 244 states and 299 transitions. [2021-12-21 17:58:01,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-21 17:58:01,876 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 4 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 31 [2021-12-21 17:58:01,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:58:01,880 INFO L225 Difference]: With dead ends: 244 [2021-12-21 17:58:01,880 INFO L226 Difference]: Without dead ends: 244 [2021-12-21 17:58:01,881 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-12-21 17:58:01,881 INFO L933 BasicCegarLoop]: 191 mSDtfsCounter, 44 mSDsluCounter, 2032 mSDsCounter, 0 mSdLazyCounter, 345 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 2223 SdHoareTripleChecker+Invalid, 466 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 345 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 107 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-21 17:58:01,881 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 2223 Invalid, 466 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 345 Invalid, 0 Unknown, 107 Unchecked, 0.6s Time] [2021-12-21 17:58:01,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-12-21 17:58:01,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 233. [2021-12-21 17:58:01,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 135 states have (on average 1.5037037037037038) internal successors, (203), 186 states have internal predecessors, (203), 31 states have call successors, (31), 12 states have call predecessors, (31), 16 states have return successors, (47), 34 states have call predecessors, (47), 31 states have call successors, (47) [2021-12-21 17:58:01,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 281 transitions. [2021-12-21 17:58:01,887 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 281 transitions. Word has length 31 [2021-12-21 17:58:01,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:58:01,887 INFO L470 AbstractCegarLoop]: Abstraction has 233 states and 281 transitions. [2021-12-21 17:58:01,887 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 4 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-21 17:58:01,887 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 281 transitions. [2021-12-21 17:58:01,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-21 17:58:01,888 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:58:01,888 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2021-12-21 17:58:01,907 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-12-21 17:58:02,095 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 17:58:02,095 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting nondet_treeErr5REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-21 17:58:02,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:58:02,096 INFO L85 PathProgramCache]: Analyzing trace with hash -931523584, now seen corresponding path program 1 times [2021-12-21 17:58:02,096 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:58:02,096 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1931308455] [2021-12-21 17:58:02,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:58:02,096 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:58:02,097 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:58:02,097 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:58:02,098 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-12-21 17:58:02,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:58:02,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-21 17:58:02,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:58:02,386 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:58:02,389 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:58:08,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 17:58:08,625 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-21 17:58:08,631 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-21 17:58:08,632 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 12 [2021-12-21 17:58:08,647 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 42 proven. 21 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-21 17:58:08,648 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 17:58:10,823 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:58:10,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1931308455] [2021-12-21 17:58:10,824 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1931308455] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 17:58:10,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [681232615] [2021-12-21 17:58:10,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:58:10,824 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-21 17:58:10,824 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-21 17:58:10,825 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-21 17:58:10,825 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-12-21 17:58:11,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:58:11,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-21 17:58:11,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:58:11,098 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:58:11,104 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:58:15,313 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 17:58:15,314 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-21 17:58:15,321 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-21 17:58:15,322 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 12 [2021-12-21 17:58:15,327 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 42 proven. 21 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-21 17:58:15,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 17:58:17,474 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [681232615] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 17:58:17,475 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 17:58:17,475 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-12-21 17:58:17,475 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867821617] [2021-12-21 17:58:17,475 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 17:58:17,475 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-21 17:58:17,475 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:58:17,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-21 17:58:17,476 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=50, Unknown=2, NotChecked=0, Total=72 [2021-12-21 17:58:17,476 INFO L87 Difference]: Start difference. First operand 233 states and 281 transitions. Second operand has 7 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 3 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2021-12-21 17:58:17,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:58:17,956 INFO L93 Difference]: Finished difference Result 238 states and 292 transitions. [2021-12-21 17:58:17,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-21 17:58:17,957 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 3 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 45 [2021-12-21 17:58:17,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:58:17,958 INFO L225 Difference]: With dead ends: 238 [2021-12-21 17:58:17,958 INFO L226 Difference]: Without dead ends: 238 [2021-12-21 17:58:17,958 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 80 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 14.3s TimeCoverageRelationStatistics Valid=27, Invalid=61, Unknown=2, NotChecked=0, Total=90 [2021-12-21 17:58:17,959 INFO L933 BasicCegarLoop]: 138 mSDtfsCounter, 170 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 371 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 176 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 599 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 371 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 176 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-21 17:58:17,959 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [176 Valid, 310 Invalid, 599 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 371 Invalid, 0 Unknown, 176 Unchecked, 0.5s Time] [2021-12-21 17:58:17,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2021-12-21 17:58:17,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 234. [2021-12-21 17:58:17,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 234 states, 136 states have (on average 1.5073529411764706) internal successors, (205), 186 states have internal predecessors, (205), 31 states have call successors, (31), 12 states have call predecessors, (31), 16 states have return successors, (47), 35 states have call predecessors, (47), 31 states have call successors, (47) [2021-12-21 17:58:17,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 283 transitions. [2021-12-21 17:58:17,964 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 283 transitions. Word has length 45 [2021-12-21 17:58:17,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:58:17,964 INFO L470 AbstractCegarLoop]: Abstraction has 234 states and 283 transitions. [2021-12-21 17:58:17,964 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 3 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2021-12-21 17:58:17,965 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 283 transitions. [2021-12-21 17:58:17,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-21 17:58:17,965 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:58:17,965 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2021-12-21 17:58:17,974 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-12-21 17:58:18,177 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Forceful destruction successful, exit code 0 [2021-12-21 17:58:18,374 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2021-12-21 17:58:18,374 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting nondet_treeErr4REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-21 17:58:18,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:58:18,374 INFO L85 PathProgramCache]: Analyzing trace with hash -931523585, now seen corresponding path program 1 times [2021-12-21 17:58:18,375 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:58:18,375 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2010270244] [2021-12-21 17:58:18,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:58:18,375 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:58:18,375 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:58:18,376 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:58:18,391 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-12-21 17:58:18,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:58:18,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-21 17:58:18,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:58:18,584 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:58:18,731 INFO L353 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-21 17:58:18,731 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 18 treesize of output 25 [2021-12-21 17:58:18,736 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 42 proven. 13 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-12-21 17:58:18,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 17:58:18,827 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:58:18,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2010270244] [2021-12-21 17:58:18,827 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2010270244] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 17:58:18,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1789260759] [2021-12-21 17:58:18,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 17:58:18,827 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-21 17:58:18,828 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-21 17:58:18,828 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-21 17:58:18,833 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2021-12-21 17:58:19,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 17:58:19,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-21 17:58:19,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:58:19,080 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:58:21,155 INFO L353 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-21 17:58:21,155 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 17 [2021-12-21 17:58:21,160 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 42 proven. 13 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-12-21 17:58:21,160 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 17:58:21,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1789260759] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 17:58:21,236 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 17:58:21,236 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-12-21 17:58:21,237 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47312039] [2021-12-21 17:58:21,237 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 17:58:21,237 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-21 17:58:21,237 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 17:58:21,237 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-21 17:58:21,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=27, Unknown=1, NotChecked=0, Total=42 [2021-12-21 17:58:21,238 INFO L87 Difference]: Start difference. First operand 234 states and 283 transitions. Second operand has 6 states, 5 states have (on average 6.6) internal successors, (33), 6 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-12-21 17:58:27,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 17:58:27,554 INFO L93 Difference]: Finished difference Result 237 states and 291 transitions. [2021-12-21 17:58:27,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 17:58:27,554 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 6.6) internal successors, (33), 6 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 45 [2021-12-21 17:58:27,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 17:58:27,555 INFO L225 Difference]: With dead ends: 237 [2021-12-21 17:58:27,555 INFO L226 Difference]: Without dead ends: 237 [2021-12-21 17:58:27,555 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 91 SyntacticMatches, 7 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=26, Invalid=44, Unknown=2, NotChecked=0, Total=72 [2021-12-21 17:58:27,556 INFO L933 BasicCegarLoop]: 156 mSDtfsCounter, 83 mSDsluCounter, 210 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 366 SdHoareTripleChecker+Invalid, 511 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 294 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-21 17:58:27,556 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 366 Invalid, 511 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 196 Invalid, 0 Unknown, 294 Unchecked, 0.3s Time] [2021-12-21 17:58:27,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2021-12-21 17:58:27,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 233. [2021-12-21 17:58:27,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 135 states have (on average 1.5037037037037038) internal successors, (203), 186 states have internal predecessors, (203), 31 states have call successors, (31), 12 states have call predecessors, (31), 16 states have return successors, (47), 34 states have call predecessors, (47), 31 states have call successors, (47) [2021-12-21 17:58:27,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 281 transitions. [2021-12-21 17:58:27,560 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 281 transitions. Word has length 45 [2021-12-21 17:58:27,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 17:58:27,561 INFO L470 AbstractCegarLoop]: Abstraction has 233 states and 281 transitions. [2021-12-21 17:58:27,561 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 6.6) internal successors, (33), 6 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-12-21 17:58:27,561 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 281 transitions. [2021-12-21 17:58:27,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-12-21 17:58:27,561 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 17:58:27,561 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1] [2021-12-21 17:58:27,571 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (20)] Forceful destruction successful, exit code 0 [2021-12-21 17:58:27,779 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Ended with exit code 0 [2021-12-21 17:58:27,969 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 17:58:27,969 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-21 17:58:27,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 17:58:27,970 INFO L85 PathProgramCache]: Analyzing trace with hash 1901629290, now seen corresponding path program 2 times [2021-12-21 17:58:27,970 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 17:58:27,970 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2112903728] [2021-12-21 17:58:27,970 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 17:58:27,970 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 17:58:27,971 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 17:58:27,971 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 17:58:27,972 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-12-21 17:58:28,136 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 17:58:28,136 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 17:58:28,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-21 17:58:28,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:58:28,161 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 17:58:32,350 INFO L353 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2021-12-21 17:58:32,350 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 21 treesize of output 37 [2021-12-21 17:58:32,430 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 41 proven. 27 refuted. 3 times theorem prover too weak. 19 trivial. 0 not checked. [2021-12-21 17:58:32,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 17:58:34,533 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 17:58:34,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2112903728] [2021-12-21 17:58:34,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2112903728] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 17:58:34,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1104286283] [2021-12-21 17:58:34,533 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 17:58:34,533 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-21 17:58:34,534 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-21 17:58:34,534 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-21 17:58:34,547 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-12-21 17:58:34,724 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 17:58:34,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [593275329] [2021-12-21 17:58:34,724 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 17:58:34,724 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 17:58:34,725 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 17:58:34,727 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 1 [2021-12-21 17:58:34,728 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 17:58:34,728 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-12-21 17:58:34,869 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 17:58:34,870 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 17:58:34,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-21 17:58:34,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 17:58:34,889 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