./Ultimate.py --spec ../sv-benchmarks/c/properties/valid-memcleanup.prp --file ../sv-benchmarks/c/verifythis/tree_del_iter.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (memcleanup) Using default analysis Version 791161d1 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_iter.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 cce1bb7a06b9dd56fbf663e182ffe801720ee05ee19a126a08070f1616bc4afe --- Real Ultimate output --- This is Ultimate 0.2.2-?-791161d [2022-07-23 05:29:49,009 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-23 05:29:49,032 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-23 05:29:49,070 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-23 05:29:49,070 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-23 05:29:49,071 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-23 05:29:49,073 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-23 05:29:49,075 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-23 05:29:49,076 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-23 05:29:49,080 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-23 05:29:49,081 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-23 05:29:49,082 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-23 05:29:49,083 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-23 05:29:49,084 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-23 05:29:49,085 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-23 05:29:49,088 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-23 05:29:49,088 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-23 05:29:49,089 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-23 05:29:49,091 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-23 05:29:49,094 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-23 05:29:49,096 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-23 05:29:49,097 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-23 05:29:49,097 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-23 05:29:49,098 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-23 05:29:49,099 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-23 05:29:49,103 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-23 05:29:49,103 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-23 05:29:49,103 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-23 05:29:49,104 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-23 05:29:49,104 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-23 05:29:49,105 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-23 05:29:49,105 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-23 05:29:49,106 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-23 05:29:49,107 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-23 05:29:49,107 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-23 05:29:49,108 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-23 05:29:49,108 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-23 05:29:49,108 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-23 05:29:49,108 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-23 05:29:49,108 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-23 05:29:49,109 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-23 05:29:49,110 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-23 05:29:49,111 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-32bit-Automizer_Default.epf [2022-07-23 05:29:49,135 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-23 05:29:49,135 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-23 05:29:49,135 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-23 05:29:49,135 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-23 05:29:49,136 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-07-23 05:29:49,137 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-07-23 05:29:49,137 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-23 05:29:49,137 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-23 05:29:49,137 INFO L138 SettingsManager]: * Use SBE=true [2022-07-23 05:29:49,138 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-23 05:29:49,138 INFO L138 SettingsManager]: * sizeof long=4 [2022-07-23 05:29:49,138 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-07-23 05:29:49,139 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-07-23 05:29:49,139 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-07-23 05:29:49,139 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-23 05:29:49,139 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-07-23 05:29:49,139 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-07-23 05:29:49,139 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-07-23 05:29:49,139 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-07-23 05:29:49,141 INFO L138 SettingsManager]: * sizeof long double=12 [2022-07-23 05:29:49,141 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-23 05:29:49,141 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-23 05:29:49,141 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-23 05:29:49,141 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-07-23 05:29:49,141 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-23 05:29:49,142 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-23 05:29:49,142 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-07-23 05:29:49,142 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-07-23 05:29:49,142 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-07-23 05:29:49,142 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cce1bb7a06b9dd56fbf663e182ffe801720ee05ee19a126a08070f1616bc4afe [2022-07-23 05:29:49,343 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-23 05:29:49,361 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-23 05:29:49,363 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-23 05:29:49,364 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-23 05:29:49,364 INFO L275 PluginConnector]: CDTParser initialized [2022-07-23 05:29:49,365 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/verifythis/tree_del_iter.c [2022-07-23 05:29:49,420 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c3c5b1dfe/358f60ad19f8400bb4d0ee4bdb88a2f8/FLAG08a9e2874 [2022-07-23 05:29:49,776 INFO L306 CDTParser]: Found 1 translation units. [2022-07-23 05:29:49,779 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_del_iter.c [2022-07-23 05:29:49,785 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c3c5b1dfe/358f60ad19f8400bb4d0ee4bdb88a2f8/FLAG08a9e2874 [2022-07-23 05:29:49,796 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c3c5b1dfe/358f60ad19f8400bb4d0ee4bdb88a2f8 [2022-07-23 05:29:49,800 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-23 05:29:49,801 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-23 05:29:49,802 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-23 05:29:49,802 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-23 05:29:49,804 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-23 05:29:49,805 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.07 05:29:49" (1/1) ... [2022-07-23 05:29:49,806 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6e1a9d52 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 05:29:49, skipping insertion in model container [2022-07-23 05:29:49,806 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.07 05:29:49" (1/1) ... [2022-07-23 05:29:49,811 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-23 05:29:49,827 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-23 05:29:49,975 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_iter.c[586,599] [2022-07-23 05:29:50,001 WARN L1550 CHandler]: Possible shadowing of function min [2022-07-23 05:29:50,023 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-23 05:29:50,034 ERROR L326 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types of different sizes while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2022-07-23 05:29:50,034 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@69a1744 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 05:29:50, skipping insertion in model container [2022-07-23 05:29:50,035 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-23 05:29:50,035 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2022-07-23 05:29:50,037 INFO L158 Benchmark]: Toolchain (without parser) took 234.66ms. Allocated memory is still 115.3MB. Free memory was 80.0MB in the beginning and 90.6MB in the end (delta: -10.5MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2022-07-23 05:29:50,039 INFO L158 Benchmark]: CDTParser took 0.18ms. Allocated memory is still 115.3MB. Free memory was 85.9MB in the beginning and 85.9MB in the end (delta: 29.9kB). There was no memory consumed. Max. memory is 16.1GB. [2022-07-23 05:29:50,039 INFO L158 Benchmark]: CACSL2BoogieTranslator took 232.91ms. Allocated memory is still 115.3MB. Free memory was 79.8MB in the beginning and 90.6MB in the end (delta: -10.7MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2022-07-23 05:29:50,041 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18ms. Allocated memory is still 115.3MB. Free memory was 85.9MB in the beginning and 85.9MB in the end (delta: 29.9kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 232.91ms. Allocated memory is still 115.3MB. Free memory was 79.8MB in the beginning and 90.6MB in the end (delta: -10.7MB). 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 of different sizes while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/verifythis/tree_del_iter.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 cce1bb7a06b9dd56fbf663e182ffe801720ee05ee19a126a08070f1616bc4afe --- Real Ultimate output --- This is Ultimate 0.2.2-?-791161d [2022-07-23 05:29:51,589 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-23 05:29:51,590 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-23 05:29:51,614 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-23 05:29:51,614 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-23 05:29:51,615 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-23 05:29:51,616 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-23 05:29:51,618 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-23 05:29:51,619 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-23 05:29:51,622 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-23 05:29:51,623 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-23 05:29:51,624 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-23 05:29:51,625 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-23 05:29:51,627 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-23 05:29:51,629 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-23 05:29:51,631 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-23 05:29:51,632 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-23 05:29:51,640 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-23 05:29:51,641 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-23 05:29:51,642 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-23 05:29:51,643 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-23 05:29:51,646 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-23 05:29:51,647 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-23 05:29:51,647 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-23 05:29:51,648 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-23 05:29:51,650 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-23 05:29:51,650 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-23 05:29:51,650 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-23 05:29:51,651 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-23 05:29:51,655 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-23 05:29:51,656 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-23 05:29:51,656 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-23 05:29:51,658 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-23 05:29:51,658 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-23 05:29:51,659 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-23 05:29:51,660 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-23 05:29:51,661 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-23 05:29:51,661 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-23 05:29:51,661 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-23 05:29:51,662 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-23 05:29:51,662 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-23 05:29:51,665 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-23 05:29:51,666 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-32bit-Automizer_Bitvector.epf [2022-07-23 05:29:51,692 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-23 05:29:51,694 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-23 05:29:51,694 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-23 05:29:51,694 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-23 05:29:51,695 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-07-23 05:29:51,695 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-07-23 05:29:51,696 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-23 05:29:51,696 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-23 05:29:51,696 INFO L138 SettingsManager]: * Use SBE=true [2022-07-23 05:29:51,697 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-23 05:29:51,697 INFO L138 SettingsManager]: * sizeof long=4 [2022-07-23 05:29:51,697 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-07-23 05:29:51,706 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-07-23 05:29:51,706 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-07-23 05:29:51,706 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-23 05:29:51,706 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-07-23 05:29:51,707 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-07-23 05:29:51,707 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-07-23 05:29:51,707 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-07-23 05:29:51,707 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2022-07-23 05:29:51,707 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2022-07-23 05:29:51,707 INFO L138 SettingsManager]: * sizeof long double=12 [2022-07-23 05:29:51,708 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-23 05:29:51,708 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-23 05:29:51,708 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-23 05:29:51,708 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-07-23 05:29:51,708 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-23 05:29:51,709 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-23 05:29:51,709 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-07-23 05:29:51,709 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2022-07-23 05:29:51,709 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2022-07-23 05:29:51,709 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-07-23 05:29:51,710 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cce1bb7a06b9dd56fbf663e182ffe801720ee05ee19a126a08070f1616bc4afe [2022-07-23 05:29:51,992 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-23 05:29:52,016 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-23 05:29:52,018 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-23 05:29:52,019 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-23 05:29:52,019 INFO L275 PluginConnector]: CDTParser initialized [2022-07-23 05:29:52,021 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/verifythis/tree_del_iter.c [2022-07-23 05:29:52,085 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e747a7cd0/11e64ba5fdb64a3087a9e3986c060783/FLAGd79941e7e [2022-07-23 05:29:52,474 INFO L306 CDTParser]: Found 1 translation units. [2022-07-23 05:29:52,474 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_del_iter.c [2022-07-23 05:29:52,480 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e747a7cd0/11e64ba5fdb64a3087a9e3986c060783/FLAGd79941e7e [2022-07-23 05:29:52,494 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e747a7cd0/11e64ba5fdb64a3087a9e3986c060783 [2022-07-23 05:29:52,495 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-23 05:29:52,497 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-23 05:29:52,498 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-23 05:29:52,499 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-23 05:29:52,501 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-23 05:29:52,502 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.07 05:29:52" (1/1) ... [2022-07-23 05:29:52,502 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@28173398 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 05:29:52, skipping insertion in model container [2022-07-23 05:29:52,503 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.07 05:29:52" (1/1) ... [2022-07-23 05:29:52,508 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-23 05:29:52,523 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-23 05:29:52,650 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_iter.c[586,599] [2022-07-23 05:29:52,685 WARN L1550 CHandler]: Possible shadowing of function min [2022-07-23 05:29:52,727 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-23 05:29:52,745 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2022-07-23 05:29:52,753 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-23 05:29:52,757 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_iter.c[586,599] [2022-07-23 05:29:52,770 WARN L1550 CHandler]: Possible shadowing of function min [2022-07-23 05:29:52,776 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-23 05:29:52,787 INFO L203 MainTranslator]: Completed pre-run [2022-07-23 05:29:52,798 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_iter.c[586,599] [2022-07-23 05:29:52,816 WARN L1550 CHandler]: Possible shadowing of function min [2022-07-23 05:29:52,824 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-23 05:29:52,841 INFO L208 MainTranslator]: Completed translation [2022-07-23 05:29:52,841 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 05:29:52 WrapperNode [2022-07-23 05:29:52,841 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-23 05:29:52,842 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-07-23 05:29:52,843 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-07-23 05:29:52,843 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-07-23 05:29:52,847 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 05:29:52" (1/1) ... [2022-07-23 05:29:52,868 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 05:29:52" (1/1) ... [2022-07-23 05:29:52,894 INFO L137 Inliner]: procedures = 31, calls = 64, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 122 [2022-07-23 05:29:52,894 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-07-23 05:29:52,895 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-07-23 05:29:52,896 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-07-23 05:29:52,896 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-07-23 05:29:52,901 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 05:29:52" (1/1) ... [2022-07-23 05:29:52,901 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 05:29:52" (1/1) ... [2022-07-23 05:29:52,913 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 05:29:52" (1/1) ... [2022-07-23 05:29:52,913 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 05:29:52" (1/1) ... [2022-07-23 05:29:52,929 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 05:29:52" (1/1) ... [2022-07-23 05:29:52,936 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 05:29:52" (1/1) ... [2022-07-23 05:29:52,938 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 05:29:52" (1/1) ... [2022-07-23 05:29:52,941 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-07-23 05:29:52,942 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-07-23 05:29:52,942 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-07-23 05:29:52,942 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-07-23 05:29:52,943 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 05:29:52" (1/1) ... [2022-07-23 05:29:52,949 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-23 05:29:52,959 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-23 05:29:52,981 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-07-23 05:29:52,993 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-07-23 05:29:53,022 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-07-23 05:29:53,023 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2022-07-23 05:29:53,023 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-07-23 05:29:53,023 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-07-23 05:29:53,023 INFO L130 BoogieDeclarations]: Found specification of procedure min [2022-07-23 05:29:53,023 INFO L138 BoogieDeclarations]: Found implementation of procedure min [2022-07-23 05:29:53,024 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2022-07-23 05:29:53,024 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2022-07-23 05:29:53,024 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2022-07-23 05:29:53,024 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-07-23 05:29:53,024 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2022-07-23 05:29:53,024 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2022-07-23 05:29:53,024 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-07-23 05:29:53,025 INFO L130 BoogieDeclarations]: Found specification of procedure size [2022-07-23 05:29:53,025 INFO L138 BoogieDeclarations]: Found implementation of procedure size [2022-07-23 05:29:53,025 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-07-23 05:29:53,025 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-07-23 05:29:53,025 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-07-23 05:29:53,025 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-07-23 05:29:53,025 INFO L130 BoogieDeclarations]: Found specification of procedure tree_inorder [2022-07-23 05:29:53,025 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_inorder [2022-07-23 05:29:53,026 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-07-23 05:29:53,026 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2022-07-23 05:29:53,153 INFO L234 CfgBuilder]: Building ICFG [2022-07-23 05:29:53,160 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-07-23 05:29:53,727 INFO L275 CfgBuilder]: Performing block encoding [2022-07-23 05:29:53,732 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-07-23 05:29:53,732 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2022-07-23 05:29:53,734 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.07 05:29:53 BoogieIcfgContainer [2022-07-23 05:29:53,734 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-07-23 05:29:53,737 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-07-23 05:29:53,737 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-07-23 05:29:53,739 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-07-23 05:29:53,740 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.07 05:29:52" (1/3) ... [2022-07-23 05:29:53,741 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1aea74ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.07 05:29:53, skipping insertion in model container [2022-07-23 05:29:53,741 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 05:29:52" (2/3) ... [2022-07-23 05:29:53,742 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1aea74ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.07 05:29:53, skipping insertion in model container [2022-07-23 05:29:53,742 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.07 05:29:53" (3/3) ... [2022-07-23 05:29:53,743 INFO L111 eAbstractionObserver]: Analyzing ICFG tree_del_iter.c [2022-07-23 05:29:53,753 INFO L201 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-07-23 05:29:53,753 INFO L160 ceAbstractionStarter]: Applying trace abstraction to program that has 64 error locations. [2022-07-23 05:29:53,793 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-23 05:29:53,798 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@a63ea1a, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@4d521409 [2022-07-23 05:29:53,798 INFO L358 AbstractCegarLoop]: Starting to check reachability of 64 error locations. [2022-07-23 05:29:53,801 INFO L276 IsEmpty]: Start isEmpty. Operand has 190 states, 99 states have (on average 1.797979797979798) internal successors, (178), 163 states have internal predecessors, (178), 20 states have call successors, (20), 6 states have call predecessors, (20), 6 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-07-23 05:29:53,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-07-23 05:29:53,807 INFO L187 NwaCegarLoop]: Found error trace [2022-07-23 05:29:53,807 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-07-23 05:29:53,808 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-23 05:29:53,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-23 05:29:53,813 INFO L85 PathProgramCache]: Analyzing trace with hash 88048840, now seen corresponding path program 1 times [2022-07-23 05:29:53,822 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-23 05:29:53,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [405500626] [2022-07-23 05:29:53,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-23 05:29:53,825 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-23 05:29:53,825 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-23 05:29:53,828 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-23 05:29:53,829 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2022-07-23 05:29:53,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-23 05:29:53,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 3 conjunts are in the unsatisfiable core [2022-07-23 05:29:53,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:29:53,939 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:29:53,947 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-23 05:29:53,947 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-23 05:29:53,948 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-23 05:29:53,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [405500626] [2022-07-23 05:29:53,949 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [405500626] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-23 05:29:53,949 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-23 05:29:53,949 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-23 05:29:53,950 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387636866] [2022-07-23 05:29:53,951 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-23 05:29:53,953 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-23 05:29:53,954 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-23 05:29:53,975 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-23 05:29:53,976 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-23 05:29:53,979 INFO L87 Difference]: Start difference. First operand has 190 states, 99 states have (on average 1.797979797979798) internal successors, (178), 163 states have internal predecessors, (178), 20 states have call successors, (20), 6 states have call predecessors, (20), 6 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-23 05:29:54,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-23 05:29:54,187 INFO L93 Difference]: Finished difference Result 191 states and 216 transitions. [2022-07-23 05:29:54,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-23 05:29:54,189 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-07-23 05:29:54,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-23 05:29:54,195 INFO L225 Difference]: With dead ends: 191 [2022-07-23 05:29:54,197 INFO L226 Difference]: Without dead ends: 188 [2022-07-23 05:29:54,200 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-23 05:29:54,203 INFO L413 NwaCegarLoop]: 213 mSDtfsCounter, 6 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 350 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-23 05:29:54,203 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 350 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-23 05:29:54,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2022-07-23 05:29:54,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 186. [2022-07-23 05:29:54,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 97 states have (on average 1.731958762886598) internal successors, (168), 159 states have internal predecessors, (168), 20 states have call successors, (20), 6 states have call predecessors, (20), 6 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-07-23 05:29:54,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 208 transitions. [2022-07-23 05:29:54,254 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 208 transitions. Word has length 5 [2022-07-23 05:29:54,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-23 05:29:54,254 INFO L495 AbstractCegarLoop]: Abstraction has 186 states and 208 transitions. [2022-07-23 05:29:54,254 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-23 05:29:54,255 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 208 transitions. [2022-07-23 05:29:54,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-07-23 05:29:54,255 INFO L187 NwaCegarLoop]: Found error trace [2022-07-23 05:29:54,256 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-07-23 05:29:54,262 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2022-07-23 05:29:54,460 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-23 05:29:54,461 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-23 05:29:54,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-23 05:29:54,461 INFO L85 PathProgramCache]: Analyzing trace with hash 88048841, now seen corresponding path program 1 times [2022-07-23 05:29:54,462 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-23 05:29:54,462 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2065974673] [2022-07-23 05:29:54,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-23 05:29:54,462 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-23 05:29:54,462 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-23 05:29:54,463 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-23 05:29:54,464 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2022-07-23 05:29:54,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-23 05:29:54,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2022-07-23 05:29:54,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:29:54,515 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:29:54,522 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-23 05:29:54,522 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-23 05:29:54,522 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-23 05:29:54,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2065974673] [2022-07-23 05:29:54,522 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2065974673] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-23 05:29:54,523 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-23 05:29:54,523 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-23 05:29:54,523 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534899863] [2022-07-23 05:29:54,523 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-23 05:29:54,524 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-23 05:29:54,524 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-23 05:29:54,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-23 05:29:54,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-23 05:29:54,525 INFO L87 Difference]: Start difference. First operand 186 states and 208 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-23 05:29:54,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-23 05:29:54,720 INFO L93 Difference]: Finished difference Result 185 states and 207 transitions. [2022-07-23 05:29:54,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-23 05:29:54,721 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-07-23 05:29:54,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-23 05:29:54,722 INFO L225 Difference]: With dead ends: 185 [2022-07-23 05:29:54,722 INFO L226 Difference]: Without dead ends: 185 [2022-07-23 05:29:54,723 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-23 05:29:54,723 INFO L413 NwaCegarLoop]: 206 mSDtfsCounter, 2 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 353 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-23 05:29:54,723 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 353 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-23 05:29:54,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2022-07-23 05:29:54,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 185. [2022-07-23 05:29:54,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 97 states have (on average 1.7216494845360826) internal successors, (167), 158 states have internal predecessors, (167), 20 states have call successors, (20), 6 states have call predecessors, (20), 6 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-07-23 05:29:54,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 207 transitions. [2022-07-23 05:29:54,732 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 207 transitions. Word has length 5 [2022-07-23 05:29:54,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-23 05:29:54,732 INFO L495 AbstractCegarLoop]: Abstraction has 185 states and 207 transitions. [2022-07-23 05:29:54,732 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-23 05:29:54,732 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 207 transitions. [2022-07-23 05:29:54,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-07-23 05:29:54,733 INFO L187 NwaCegarLoop]: Found error trace [2022-07-23 05:29:54,733 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-23 05:29:54,741 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2022-07-23 05:29:54,939 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-23 05:29:54,940 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting minErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-23 05:29:54,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-23 05:29:54,940 INFO L85 PathProgramCache]: Analyzing trace with hash -163614216, now seen corresponding path program 1 times [2022-07-23 05:29:54,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-23 05:29:54,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1621799626] [2022-07-23 05:29:54,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-23 05:29:54,941 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-23 05:29:54,941 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-23 05:29:54,942 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-23 05:29:54,944 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2022-07-23 05:29:54,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-23 05:29:54,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 13 conjunts are in the unsatisfiable core [2022-07-23 05:29:54,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:29:55,084 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-23 05:29:55,085 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-23 05:29:55,085 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-23 05:29:55,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1621799626] [2022-07-23 05:29:55,085 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1621799626] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-23 05:29:55,085 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-23 05:29:55,085 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-07-23 05:29:55,086 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140922326] [2022-07-23 05:29:55,086 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-23 05:29:55,086 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-07-23 05:29:55,086 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-23 05:29:55,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-07-23 05:29:55,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-07-23 05:29:55,087 INFO L87 Difference]: Start difference. First operand 185 states and 207 transitions. Second operand has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-23 05:29:55,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-23 05:29:55,203 INFO L93 Difference]: Finished difference Result 297 states and 335 transitions. [2022-07-23 05:29:55,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-23 05:29:55,204 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-07-23 05:29:55,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-23 05:29:55,206 INFO L225 Difference]: With dead ends: 297 [2022-07-23 05:29:55,206 INFO L226 Difference]: Without dead ends: 297 [2022-07-23 05:29:55,207 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2022-07-23 05:29:55,208 INFO L413 NwaCegarLoop]: 213 mSDtfsCounter, 193 mSDsluCounter, 1008 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 193 SdHoareTripleChecker+Valid, 1221 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-23 05:29:55,209 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [193 Valid, 1221 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-23 05:29:55,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2022-07-23 05:29:55,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 193. [2022-07-23 05:29:55,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 102 states have (on average 1.6862745098039216) internal successors, (172), 164 states have internal predecessors, (172), 21 states have call successors, (21), 7 states have call predecessors, (21), 8 states have return successors, (24), 21 states have call predecessors, (24), 21 states have call successors, (24) [2022-07-23 05:29:55,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 217 transitions. [2022-07-23 05:29:55,219 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 217 transitions. Word has length 11 [2022-07-23 05:29:55,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-23 05:29:55,219 INFO L495 AbstractCegarLoop]: Abstraction has 193 states and 217 transitions. [2022-07-23 05:29:55,235 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-23 05:29:55,235 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 217 transitions. [2022-07-23 05:29:55,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-07-23 05:29:55,236 INFO L187 NwaCegarLoop]: Found error trace [2022-07-23 05:29:55,236 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-23 05:29:55,264 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2022-07-23 05:29:55,447 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-23 05:29:55,447 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-23 05:29:55,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-23 05:29:55,448 INFO L85 PathProgramCache]: Analyzing trace with hash -916126343, now seen corresponding path program 1 times [2022-07-23 05:29:55,448 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-23 05:29:55,448 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1445341682] [2022-07-23 05:29:55,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-23 05:29:55,448 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-23 05:29:55,449 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-23 05:29:55,451 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-23 05:29:55,453 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2022-07-23 05:29:55,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-23 05:29:55,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 5 conjunts are in the unsatisfiable core [2022-07-23 05:29:55,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:29:55,510 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:29:55,530 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-23 05:29:55,530 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-23 05:29:55,531 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-23 05:29:55,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1445341682] [2022-07-23 05:29:55,531 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1445341682] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-23 05:29:55,531 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-23 05:29:55,531 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-23 05:29:55,531 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1820764604] [2022-07-23 05:29:55,531 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-23 05:29:55,532 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-07-23 05:29:55,532 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-23 05:29:55,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-07-23 05:29:55,532 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-07-23 05:29:55,532 INFO L87 Difference]: Start difference. First operand 193 states and 217 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-23 05:29:55,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-23 05:29:55,863 INFO L93 Difference]: Finished difference Result 197 states and 221 transitions. [2022-07-23 05:29:55,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-07-23 05:29:55,864 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-07-23 05:29:55,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-23 05:29:55,866 INFO L225 Difference]: With dead ends: 197 [2022-07-23 05:29:55,866 INFO L226 Difference]: Without dead ends: 197 [2022-07-23 05:29:55,866 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-07-23 05:29:55,867 INFO L413 NwaCegarLoop]: 178 mSDtfsCounter, 64 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 229 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 229 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-23 05:29:55,867 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 309 Invalid, 252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 229 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-07-23 05:29:55,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2022-07-23 05:29:55,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 195. [2022-07-23 05:29:55,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 104 states have (on average 1.6923076923076923) internal successors, (176), 164 states have internal predecessors, (176), 21 states have call successors, (21), 7 states have call predecessors, (21), 8 states have return successors, (24), 23 states have call predecessors, (24), 21 states have call successors, (24) [2022-07-23 05:29:55,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 221 transitions. [2022-07-23 05:29:55,874 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 221 transitions. Word has length 11 [2022-07-23 05:29:55,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-23 05:29:55,874 INFO L495 AbstractCegarLoop]: Abstraction has 195 states and 221 transitions. [2022-07-23 05:29:55,874 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-23 05:29:55,874 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 221 transitions. [2022-07-23 05:29:55,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-07-23 05:29:55,875 INFO L187 NwaCegarLoop]: Found error trace [2022-07-23 05:29:55,875 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-23 05:29:55,892 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2022-07-23 05:29:56,083 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-23 05:29:56,084 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting nondet_treeErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-23 05:29:56,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-23 05:29:56,084 INFO L85 PathProgramCache]: Analyzing trace with hash -916126342, now seen corresponding path program 1 times [2022-07-23 05:29:56,084 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-23 05:29:56,084 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [857252898] [2022-07-23 05:29:56,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-23 05:29:56,085 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-23 05:29:56,085 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-23 05:29:56,086 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-23 05:29:56,086 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2022-07-23 05:29:56,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-23 05:29:56,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 6 conjunts are in the unsatisfiable core [2022-07-23 05:29:56,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:29:56,168 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:29:56,219 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-23 05:29:56,219 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-23 05:29:56,219 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-23 05:29:56,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [857252898] [2022-07-23 05:29:56,220 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [857252898] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-23 05:29:56,220 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-23 05:29:56,220 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-23 05:29:56,220 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650192411] [2022-07-23 05:29:56,220 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-23 05:29:56,221 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-07-23 05:29:56,221 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-23 05:29:56,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-07-23 05:29:56,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-07-23 05:29:56,221 INFO L87 Difference]: Start difference. First operand 195 states and 221 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-23 05:29:56,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-23 05:29:56,586 INFO L93 Difference]: Finished difference Result 201 states and 231 transitions. [2022-07-23 05:29:56,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-07-23 05:29:56,587 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-07-23 05:29:56,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-23 05:29:56,589 INFO L225 Difference]: With dead ends: 201 [2022-07-23 05:29:56,589 INFO L226 Difference]: Without dead ends: 201 [2022-07-23 05:29:56,589 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-07-23 05:29:56,590 INFO L413 NwaCegarLoop]: 182 mSDtfsCounter, 62 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 212 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 336 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 212 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-07-23 05:29:56,590 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 336 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 212 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-07-23 05:29:56,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2022-07-23 05:29:56,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 198. [2022-07-23 05:29:56,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 106 states have (on average 1.669811320754717) internal successors, (177), 166 states have internal predecessors, (177), 22 states have call successors, (22), 7 states have call predecessors, (22), 8 states have return successors, (26), 24 states have call predecessors, (26), 22 states have call successors, (26) [2022-07-23 05:29:56,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 225 transitions. [2022-07-23 05:29:56,596 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 225 transitions. Word has length 11 [2022-07-23 05:29:56,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-23 05:29:56,597 INFO L495 AbstractCegarLoop]: Abstraction has 198 states and 225 transitions. [2022-07-23 05:29:56,597 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-23 05:29:56,597 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 225 transitions. [2022-07-23 05:29:56,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-07-23 05:29:56,597 INFO L187 NwaCegarLoop]: Found error trace [2022-07-23 05:29:56,598 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-23 05:29:56,606 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2022-07-23 05:29:56,798 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-23 05:29:56,800 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting sizeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-23 05:29:56,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-23 05:29:56,801 INFO L85 PathProgramCache]: Analyzing trace with hash -1497511222, now seen corresponding path program 1 times [2022-07-23 05:29:56,801 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-23 05:29:56,801 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2038336262] [2022-07-23 05:29:56,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-23 05:29:56,801 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-23 05:29:56,802 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-23 05:29:56,802 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-23 05:29:56,804 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2022-07-23 05:29:56,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-23 05:29:56,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 13 conjunts are in the unsatisfiable core [2022-07-23 05:29:56,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:29:56,906 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-23 05:29:56,907 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-23 05:29:56,907 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-23 05:29:56,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2038336262] [2022-07-23 05:29:56,907 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2038336262] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-23 05:29:56,907 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-23 05:29:56,907 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-07-23 05:29:56,908 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116854760] [2022-07-23 05:29:56,908 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-23 05:29:56,908 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-07-23 05:29:56,908 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-23 05:29:56,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-07-23 05:29:56,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-07-23 05:29:56,909 INFO L87 Difference]: Start difference. First operand 198 states and 225 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-23 05:29:57,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-23 05:29:57,014 INFO L93 Difference]: Finished difference Result 306 states and 347 transitions. [2022-07-23 05:29:57,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-23 05:29:57,014 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2022-07-23 05:29:57,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-23 05:29:57,016 INFO L225 Difference]: With dead ends: 306 [2022-07-23 05:29:57,016 INFO L226 Difference]: Without dead ends: 306 [2022-07-23 05:29:57,016 INFO L412 NwaCegarLoop]: 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 [2022-07-23 05:29:57,017 INFO L413 NwaCegarLoop]: 212 mSDtfsCounter, 192 mSDsluCounter, 1008 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 1220 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-23 05:29:57,017 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [192 Valid, 1220 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-23 05:29:57,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2022-07-23 05:29:57,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 244. [2022-07-23 05:29:57,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 145 states have (on average 1.696551724137931) internal successors, (246), 205 states have internal predecessors, (246), 28 states have call successors, (28), 8 states have call predecessors, (28), 9 states have return successors, (32), 30 states have call predecessors, (32), 28 states have call successors, (32) [2022-07-23 05:29:57,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 306 transitions. [2022-07-23 05:29:57,024 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 306 transitions. Word has length 17 [2022-07-23 05:29:57,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-23 05:29:57,024 INFO L495 AbstractCegarLoop]: Abstraction has 244 states and 306 transitions. [2022-07-23 05:29:57,024 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-23 05:29:57,024 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 306 transitions. [2022-07-23 05:29:57,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-07-23 05:29:57,025 INFO L187 NwaCegarLoop]: Found error trace [2022-07-23 05:29:57,025 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-23 05:29:57,042 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2022-07-23 05:29:57,232 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-23 05:29:57,232 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-23 05:29:57,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-23 05:29:57,232 INFO L85 PathProgramCache]: Analyzing trace with hash -2030552348, now seen corresponding path program 1 times [2022-07-23 05:29:57,232 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-23 05:29:57,233 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [870437915] [2022-07-23 05:29:57,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-23 05:29:57,233 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-23 05:29:57,233 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-23 05:29:57,234 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-23 05:29:57,236 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2022-07-23 05:29:57,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-23 05:29:57,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 11 conjunts are in the unsatisfiable core [2022-07-23 05:29:57,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:29:57,381 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:29:57,511 INFO L356 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-07-23 05:29:57,512 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 18 treesize of output 25 [2022-07-23 05:29:57,519 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-07-23 05:29:57,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-23 05:29:57,634 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-23 05:29:57,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [870437915] [2022-07-23 05:29:57,634 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [870437915] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-23 05:29:57,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1493812872] [2022-07-23 05:29:57,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-23 05:29:57,635 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-23 05:29:57,635 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-23 05:29:57,651 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) [2022-07-23 05:29:57,661 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2022-07-23 05:29:57,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-23 05:29:57,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 12 conjunts are in the unsatisfiable core [2022-07-23 05:29:57,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:29:57,801 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:29:59,907 INFO L356 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2022-07-23 05:29:59,907 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 17 [2022-07-23 05:29:59,913 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-07-23 05:29:59,913 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-23 05:30:00,013 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1493812872] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-23 05:30:00,013 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-23 05:30:00,013 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2022-07-23 05:30:00,013 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918262701] [2022-07-23 05:30:00,013 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-23 05:30:00,014 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-07-23 05:30:00,014 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-23 05:30:00,014 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-07-23 05:30:00,014 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=27, Unknown=1, NotChecked=0, Total=42 [2022-07-23 05:30:00,015 INFO L87 Difference]: Start difference. First operand 244 states and 306 transitions. Second operand has 6 states, 5 states have (on average 5.4) internal successors, (27), 6 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-07-23 05:30:06,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-23 05:30:06,412 INFO L93 Difference]: Finished difference Result 250 states and 314 transitions. [2022-07-23 05:30:06,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-23 05:30:06,413 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.4) internal successors, (27), 6 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 29 [2022-07-23 05:30:06,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-23 05:30:06,414 INFO L225 Difference]: With dead ends: 250 [2022-07-23 05:30:06,414 INFO L226 Difference]: Without dead ends: 250 [2022-07-23 05:30:06,415 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 58 SyntacticMatches, 7 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=26, Invalid=44, Unknown=2, NotChecked=0, Total=72 [2022-07-23 05:30:06,415 INFO L413 NwaCegarLoop]: 180 mSDtfsCounter, 61 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 442 SdHoareTripleChecker+Invalid, 541 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 304 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-23 05:30:06,415 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 442 Invalid, 541 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 216 Invalid, 0 Unknown, 304 Unchecked, 0.3s Time] [2022-07-23 05:30:06,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2022-07-23 05:30:06,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 248. [2022-07-23 05:30:06,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 248 states, 148 states have (on average 1.6891891891891893) internal successors, (250), 208 states have internal predecessors, (250), 28 states have call successors, (28), 8 states have call predecessors, (28), 10 states have return successors, (36), 31 states have call predecessors, (36), 28 states have call successors, (36) [2022-07-23 05:30:06,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 314 transitions. [2022-07-23 05:30:06,422 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 314 transitions. Word has length 29 [2022-07-23 05:30:06,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-23 05:30:06,422 INFO L495 AbstractCegarLoop]: Abstraction has 248 states and 314 transitions. [2022-07-23 05:30:06,422 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.4) internal successors, (27), 6 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-07-23 05:30:06,422 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 314 transitions. [2022-07-23 05:30:06,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-07-23 05:30:06,423 INFO L187 NwaCegarLoop]: Found error trace [2022-07-23 05:30:06,423 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-07-23 05:30:06,437 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (9)] Ended with exit code 0 [2022-07-23 05:30:06,638 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2022-07-23 05:30:06,836 WARN L477 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 [2022-07-23 05:30:06,836 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting nondet_treeErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-23 05:30:06,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-23 05:30:06,837 INFO L85 PathProgramCache]: Analyzing trace with hash 2020472179, now seen corresponding path program 1 times [2022-07-23 05:30:06,837 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-23 05:30:06,837 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [950242872] [2022-07-23 05:30:06,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-23 05:30:06,837 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-23 05:30:06,837 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-23 05:30:06,838 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) [2022-07-23 05:30:06,839 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2022-07-23 05:30:07,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-23 05:30:07,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 16 conjunts are in the unsatisfiable core [2022-07-23 05:30:07,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:30:07,038 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:30:07,043 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:30:11,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-23 05:30:11,253 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-23 05:30:11,265 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-23 05:30:11,265 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 12 [2022-07-23 05:30:11,282 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 25 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-07-23 05:30:11,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-23 05:30:11,503 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-23 05:30:11,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [950242872] [2022-07-23 05:30:11,503 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [950242872] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-23 05:30:11,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1775103967] [2022-07-23 05:30:11,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-23 05:30:11,504 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-23 05:30:11,504 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-23 05:30:11,505 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) [2022-07-23 05:30:11,519 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2022-07-23 05:30:11,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-23 05:30:11,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 16 conjunts are in the unsatisfiable core [2022-07-23 05:30:11,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:30:11,700 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:30:11,704 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:30:17,834 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-23 05:30:17,835 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-23 05:30:17,843 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-23 05:30:17,843 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 12 [2022-07-23 05:30:17,854 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 25 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-07-23 05:30:17,854 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-23 05:30:19,991 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1775103967] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-23 05:30:19,991 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-23 05:30:19,992 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2022-07-23 05:30:19,992 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090252141] [2022-07-23 05:30:19,992 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-23 05:30:19,992 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-07-23 05:30:19,992 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-23 05:30:19,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-07-23 05:30:19,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2022-07-23 05:30:19,993 INFO L87 Difference]: Start difference. First operand 248 states and 314 transitions. Second operand has 7 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-07-23 05:30:20,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-23 05:30:20,424 INFO L93 Difference]: Finished difference Result 267 states and 346 transitions. [2022-07-23 05:30:20,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-07-23 05:30:20,424 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 35 [2022-07-23 05:30:20,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-23 05:30:20,426 INFO L225 Difference]: With dead ends: 267 [2022-07-23 05:30:20,426 INFO L226 Difference]: Without dead ends: 267 [2022-07-23 05:30:20,426 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 60 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2022-07-23 05:30:20,426 INFO L413 NwaCegarLoop]: 180 mSDtfsCounter, 129 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 414 SdHoareTripleChecker+Invalid, 435 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 160 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-07-23 05:30:20,427 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [135 Valid, 414 Invalid, 435 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 220 Invalid, 0 Unknown, 160 Unchecked, 0.4s Time] [2022-07-23 05:30:20,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2022-07-23 05:30:20,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 264. [2022-07-23 05:30:20,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 264 states, 159 states have (on average 1.6415094339622642) internal successors, (261), 220 states have internal predecessors, (261), 31 states have call successors, (31), 9 states have call predecessors, (31), 12 states have return successors, (45), 34 states have call predecessors, (45), 31 states have call successors, (45) [2022-07-23 05:30:20,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 337 transitions. [2022-07-23 05:30:20,434 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 337 transitions. Word has length 35 [2022-07-23 05:30:20,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-23 05:30:20,434 INFO L495 AbstractCegarLoop]: Abstraction has 264 states and 337 transitions. [2022-07-23 05:30:20,434 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-07-23 05:30:20,435 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 337 transitions. [2022-07-23 05:30:20,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-07-23 05:30:20,435 INFO L187 NwaCegarLoop]: Found error trace [2022-07-23 05:30:20,436 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-23 05:30:20,445 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2022-07-23 05:30:20,646 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Ended with exit code 0 [2022-07-23 05:30:20,839 WARN L477 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 [2022-07-23 05:30:20,839 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting minErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-23 05:30:20,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-23 05:30:20,839 INFO L85 PathProgramCache]: Analyzing trace with hash -599064084, now seen corresponding path program 1 times [2022-07-23 05:30:20,840 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-23 05:30:20,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1929402260] [2022-07-23 05:30:20,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-23 05:30:20,840 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-23 05:30:20,840 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-23 05:30:20,841 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) [2022-07-23 05:30:20,842 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2022-07-23 05:30:20,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-23 05:30:20,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 13 conjunts are in the unsatisfiable core [2022-07-23 05:30:20,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:30:20,949 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:30:21,019 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-07-23 05:30:21,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-23 05:30:21,152 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-07-23 05:30:21,152 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-23 05:30:21,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1929402260] [2022-07-23 05:30:21,152 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1929402260] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-23 05:30:21,152 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-23 05:30:21,152 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2022-07-23 05:30:21,152 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [801616053] [2022-07-23 05:30:21,152 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-23 05:30:21,153 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-23 05:30:21,153 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-23 05:30:21,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-23 05:30:21,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2022-07-23 05:30:21,153 INFO L87 Difference]: Start difference. First operand 264 states and 337 transitions. Second operand has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-07-23 05:30:22,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-23 05:30:22,246 INFO L93 Difference]: Finished difference Result 304 states and 361 transitions. [2022-07-23 05:30:22,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-07-23 05:30:22,247 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 25 [2022-07-23 05:30:22,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-23 05:30:22,248 INFO L225 Difference]: With dead ends: 304 [2022-07-23 05:30:22,248 INFO L226 Difference]: Without dead ends: 304 [2022-07-23 05:30:22,248 INFO L412 NwaCegarLoop]: 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 [2022-07-23 05:30:22,249 INFO L413 NwaCegarLoop]: 213 mSDtfsCounter, 217 mSDsluCounter, 750 mSDsCounter, 0 mSdLazyCounter, 1145 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 221 SdHoareTripleChecker+Valid, 963 SdHoareTripleChecker+Invalid, 1292 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 1145 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 96 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-07-23 05:30:22,249 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [221 Valid, 963 Invalid, 1292 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 1145 Invalid, 0 Unknown, 96 Unchecked, 1.0s Time] [2022-07-23 05:30:22,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2022-07-23 05:30:22,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 276. [2022-07-23 05:30:22,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 276 states, 170 states have (on average 1.6235294117647059) internal successors, (276), 229 states have internal predecessors, (276), 33 states have call successors, (33), 10 states have call predecessors, (33), 13 states have return successors, (47), 36 states have call predecessors, (47), 33 states have call successors, (47) [2022-07-23 05:30:22,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 356 transitions. [2022-07-23 05:30:22,258 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 356 transitions. Word has length 25 [2022-07-23 05:30:22,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-23 05:30:22,258 INFO L495 AbstractCegarLoop]: Abstraction has 276 states and 356 transitions. [2022-07-23 05:30:22,258 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-07-23 05:30:22,259 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 356 transitions. [2022-07-23 05:30:22,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-07-23 05:30:22,263 INFO L187 NwaCegarLoop]: Found error trace [2022-07-23 05:30:22,263 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-23 05:30:22,270 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2022-07-23 05:30:22,466 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-23 05:30:22,466 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting minErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-23 05:30:22,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-23 05:30:22,466 INFO L85 PathProgramCache]: Analyzing trace with hash -599064083, now seen corresponding path program 1 times [2022-07-23 05:30:22,466 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-23 05:30:22,467 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2081340653] [2022-07-23 05:30:22,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-23 05:30:22,467 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-23 05:30:22,467 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-23 05:30:22,468 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-23 05:30:22,468 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2022-07-23 05:30:22,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-23 05:30:22,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 20 conjunts are in the unsatisfiable core [2022-07-23 05:30:22,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:30:22,554 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:30:22,657 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-07-23 05:30:22,657 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-23 05:30:23,328 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-07-23 05:30:23,328 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-23 05:30:23,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2081340653] [2022-07-23 05:30:23,328 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2081340653] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-23 05:30:23,328 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-23 05:30:23,328 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2022-07-23 05:30:23,328 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29376085] [2022-07-23 05:30:23,328 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-23 05:30:23,329 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-07-23 05:30:23,329 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-23 05:30:23,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-07-23 05:30:23,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2022-07-23 05:30:23,329 INFO L87 Difference]: Start difference. First operand 276 states and 356 transitions. Second operand has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-07-23 05:30:26,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-23 05:30:26,271 INFO L93 Difference]: Finished difference Result 301 states and 392 transitions. [2022-07-23 05:30:26,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-07-23 05:30:26,272 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 25 [2022-07-23 05:30:26,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-23 05:30:26,274 INFO L225 Difference]: With dead ends: 301 [2022-07-23 05:30:26,274 INFO L226 Difference]: Without dead ends: 301 [2022-07-23 05:30:26,275 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=74, Invalid=388, Unknown=0, NotChecked=0, Total=462 [2022-07-23 05:30:26,275 INFO L413 NwaCegarLoop]: 185 mSDtfsCounter, 126 mSDsluCounter, 923 mSDsCounter, 0 mSdLazyCounter, 1354 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 1108 SdHoareTripleChecker+Invalid, 1462 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 1354 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 64 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-07-23 05:30:26,275 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [130 Valid, 1108 Invalid, 1462 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 1354 Invalid, 0 Unknown, 64 Unchecked, 2.7s Time] [2022-07-23 05:30:26,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2022-07-23 05:30:26,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 292. [2022-07-23 05:30:26,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 182 states have (on average 1.598901098901099) internal successors, (291), 241 states have internal predecessors, (291), 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) [2022-07-23 05:30:26,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 377 transitions. [2022-07-23 05:30:26,282 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 377 transitions. Word has length 25 [2022-07-23 05:30:26,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-23 05:30:26,283 INFO L495 AbstractCegarLoop]: Abstraction has 292 states and 377 transitions. [2022-07-23 05:30:26,283 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-07-23 05:30:26,283 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 377 transitions. [2022-07-23 05:30:26,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-07-23 05:30:26,288 INFO L187 NwaCegarLoop]: Found error trace [2022-07-23 05:30:26,288 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-23 05:30:26,295 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2022-07-23 05:30:26,494 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-23 05:30:26,495 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting tree_inorderErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-23 05:30:26,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-23 05:30:26,495 INFO L85 PathProgramCache]: Analyzing trace with hash -1805510171, now seen corresponding path program 1 times [2022-07-23 05:30:26,495 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-23 05:30:26,495 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1636036817] [2022-07-23 05:30:26,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-23 05:30:26,496 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-23 05:30:26,496 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-23 05:30:26,497 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-23 05:30:26,498 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2022-07-23 05:30:26,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-23 05:30:26,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 6 conjunts are in the unsatisfiable core [2022-07-23 05:30:26,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:30:26,597 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-23 05:30:26,597 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-23 05:30:26,597 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-23 05:30:26,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1636036817] [2022-07-23 05:30:26,598 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1636036817] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-23 05:30:26,598 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-23 05:30:26,598 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-07-23 05:30:26,598 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1971912160] [2022-07-23 05:30:26,598 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-23 05:30:26,598 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-07-23 05:30:26,598 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-23 05:30:26,599 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-07-23 05:30:26,599 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-07-23 05:30:26,599 INFO L87 Difference]: Start difference. First operand 292 states and 377 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) [2022-07-23 05:30:26,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-23 05:30:26,621 INFO L93 Difference]: Finished difference Result 258 states and 309 transitions. [2022-07-23 05:30:26,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-07-23 05:30:26,622 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 [2022-07-23 05:30:26,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-23 05:30:26,622 INFO L225 Difference]: With dead ends: 258 [2022-07-23 05:30:26,623 INFO L226 Difference]: Without dead ends: 242 [2022-07-23 05:30:26,623 INFO L412 NwaCegarLoop]: 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 [2022-07-23 05:30:26,623 INFO L413 NwaCegarLoop]: 204 mSDtfsCounter, 0 mSDsluCounter, 604 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 808 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-23 05:30:26,624 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 808 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-23 05:30:26,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2022-07-23 05:30:26,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 242. [2022-07-23 05:30:26,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 242 states, 140 states have (on average 1.5642857142857143) internal successors, (219), 200 states have internal predecessors, (219), 29 states have call successors, (29), 9 states have call predecessors, (29), 13 states have return successors, (45), 32 states have call predecessors, (45), 29 states have call successors, (45) [2022-07-23 05:30:26,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 293 transitions. [2022-07-23 05:30:26,642 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 293 transitions. Word has length 30 [2022-07-23 05:30:26,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-23 05:30:26,642 INFO L495 AbstractCegarLoop]: Abstraction has 242 states and 293 transitions. [2022-07-23 05:30:26,642 INFO L496 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) [2022-07-23 05:30:26,642 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 293 transitions. [2022-07-23 05:30:26,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-07-23 05:30:26,643 INFO L187 NwaCegarLoop]: Found error trace [2022-07-23 05:30:26,643 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-23 05:30:26,658 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2022-07-23 05:30:26,851 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-23 05:30:26,852 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting sizeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-23 05:30:26,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-23 05:30:26,852 INFO L85 PathProgramCache]: Analyzing trace with hash -1626172482, now seen corresponding path program 1 times [2022-07-23 05:30:26,853 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-23 05:30:26,853 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1902696747] [2022-07-23 05:30:26,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-23 05:30:26,853 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-23 05:30:26,853 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-23 05:30:26,854 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-23 05:30:26,855 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2022-07-23 05:30:26,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-23 05:30:26,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2022-07-23 05:30:26,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:30:26,976 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-07-23 05:30:26,976 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-23 05:30:26,976 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-23 05:30:26,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1902696747] [2022-07-23 05:30:26,976 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1902696747] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-23 05:30:26,976 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-23 05:30:26,977 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-07-23 05:30:26,977 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1450997958] [2022-07-23 05:30:26,977 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-23 05:30:26,977 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-07-23 05:30:26,977 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-23 05:30:26,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-07-23 05:30:26,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-07-23 05:30:26,977 INFO L87 Difference]: Start difference. First operand 242 states and 293 transitions. Second operand has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-07-23 05:30:27,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-23 05:30:27,197 INFO L93 Difference]: Finished difference Result 248 states and 302 transitions. [2022-07-23 05:30:27,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-23 05:30:27,197 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 31 [2022-07-23 05:30:27,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-23 05:30:27,198 INFO L225 Difference]: With dead ends: 248 [2022-07-23 05:30:27,198 INFO L226 Difference]: Without dead ends: 244 [2022-07-23 05:30:27,198 INFO L412 NwaCegarLoop]: 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 [2022-07-23 05:30:27,199 INFO L413 NwaCegarLoop]: 186 mSDtfsCounter, 211 mSDsluCounter, 850 mSDsCounter, 0 mSdLazyCounter, 170 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 215 SdHoareTripleChecker+Valid, 1036 SdHoareTripleChecker+Invalid, 192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 170 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-23 05:30:27,199 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [215 Valid, 1036 Invalid, 192 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 170 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-23 05:30:27,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2022-07-23 05:30:27,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 242. [2022-07-23 05:30:27,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 242 states, 140 states have (on average 1.55) internal successors, (217), 200 states have internal predecessors, (217), 29 states have call successors, (29), 9 states have call predecessors, (29), 13 states have return successors, (45), 32 states have call predecessors, (45), 29 states have call successors, (45) [2022-07-23 05:30:27,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 291 transitions. [2022-07-23 05:30:27,206 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 291 transitions. Word has length 31 [2022-07-23 05:30:27,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-23 05:30:27,206 INFO L495 AbstractCegarLoop]: Abstraction has 242 states and 291 transitions. [2022-07-23 05:30:27,206 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-07-23 05:30:27,206 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 291 transitions. [2022-07-23 05:30:27,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-07-23 05:30:27,208 INFO L187 NwaCegarLoop]: Found error trace [2022-07-23 05:30:27,208 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-23 05:30:27,225 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2022-07-23 05:30:27,408 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-23 05:30:27,409 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting minErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-23 05:30:27,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-23 05:30:27,409 INFO L85 PathProgramCache]: Analyzing trace with hash -575590880, now seen corresponding path program 1 times [2022-07-23 05:30:27,409 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-23 05:30:27,409 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1805220599] [2022-07-23 05:30:27,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-23 05:30:27,409 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-23 05:30:27,410 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-23 05:30:27,412 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-23 05:30:27,414 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2022-07-23 05:30:27,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-23 05:30:27,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 37 conjunts are in the unsatisfiable core [2022-07-23 05:30:27,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:30:27,557 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-07-23 05:30:27,564 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-07-23 05:30:27,629 INFO L356 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2022-07-23 05:30:27,630 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2022-07-23 05:30:27,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-23 05:30:27,637 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2022-07-23 05:30:27,802 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2022-07-23 05:30:27,805 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2022-07-23 05:30:27,871 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-23 05:30:27,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-23 05:30:32,603 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-23 05:30:32,603 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-23 05:30:32,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1805220599] [2022-07-23 05:30:32,603 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1805220599] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-23 05:30:32,603 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-23 05:30:32,603 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2022-07-23 05:30:32,603 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1259515093] [2022-07-23 05:30:32,603 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-23 05:30:32,604 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-07-23 05:30:32,604 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-23 05:30:32,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-07-23 05:30:32,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=181, Unknown=1, NotChecked=0, Total=210 [2022-07-23 05:30:32,604 INFO L87 Difference]: Start difference. First operand 242 states and 291 transitions. Second operand has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 4 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2022-07-23 05:30:33,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-23 05:30:33,395 INFO L93 Difference]: Finished difference Result 260 states and 315 transitions. [2022-07-23 05:30:33,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-07-23 05:30:33,396 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 4 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 31 [2022-07-23 05:30:33,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-23 05:30:33,397 INFO L225 Difference]: With dead ends: 260 [2022-07-23 05:30:33,397 INFO L226 Difference]: Without dead ends: 260 [2022-07-23 05:30:33,398 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=59, Invalid=402, Unknown=1, NotChecked=0, Total=462 [2022-07-23 05:30:33,398 INFO L413 NwaCegarLoop]: 207 mSDtfsCounter, 44 mSDsluCounter, 2181 mSDsCounter, 0 mSdLazyCounter, 381 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 2388 SdHoareTripleChecker+Invalid, 485 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 381 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 90 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-07-23 05:30:33,399 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 2388 Invalid, 485 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 381 Invalid, 0 Unknown, 90 Unchecked, 0.6s Time] [2022-07-23 05:30:33,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2022-07-23 05:30:33,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 249. [2022-07-23 05:30:33,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 145 states have (on average 1.5379310344827586) internal successors, (223), 205 states have internal predecessors, (223), 29 states have call successors, (29), 11 states have call predecessors, (29), 15 states have return successors, (45), 32 states have call predecessors, (45), 29 states have call successors, (45) [2022-07-23 05:30:33,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 297 transitions. [2022-07-23 05:30:33,406 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 297 transitions. Word has length 31 [2022-07-23 05:30:33,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-23 05:30:33,406 INFO L495 AbstractCegarLoop]: Abstraction has 249 states and 297 transitions. [2022-07-23 05:30:33,407 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 4 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2022-07-23 05:30:33,407 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 297 transitions. [2022-07-23 05:30:33,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-07-23 05:30:33,408 INFO L187 NwaCegarLoop]: Found error trace [2022-07-23 05:30:33,408 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2022-07-23 05:30:33,420 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2022-07-23 05:30:33,609 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-23 05:30:33,609 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting nondet_treeErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-23 05:30:33,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-23 05:30:33,610 INFO L85 PathProgramCache]: Analyzing trace with hash 698832763, now seen corresponding path program 1 times [2022-07-23 05:30:33,610 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-23 05:30:33,610 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1620977988] [2022-07-23 05:30:33,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-23 05:30:33,610 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-23 05:30:33,611 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-23 05:30:33,612 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-23 05:30:33,613 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2022-07-23 05:30:33,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-23 05:30:33,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 20 conjunts are in the unsatisfiable core [2022-07-23 05:30:33,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:30:33,877 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:30:33,880 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:30:38,049 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-23 05:30:38,050 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-23 05:30:38,057 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-23 05:30:38,057 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 12 [2022-07-23 05:30:38,072 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 42 proven. 21 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-07-23 05:30:38,073 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-23 05:30:41,032 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-23 05:30:41,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1620977988] [2022-07-23 05:30:41,033 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1620977988] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-23 05:30:41,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [672762267] [2022-07-23 05:30:41,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-23 05:30:41,033 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-23 05:30:41,033 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-23 05:30:41,034 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-07-23 05:30:41,035 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2022-07-23 05:30:41,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-23 05:30:41,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 20 conjunts are in the unsatisfiable core [2022-07-23 05:30:41,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:30:41,309 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:30:41,314 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:30:47,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-23 05:30:47,465 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-23 05:30:47,473 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-23 05:30:47,473 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 12 [2022-07-23 05:30:47,478 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 42 proven. 21 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-07-23 05:30:47,478 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-23 05:30:47,632 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [672762267] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-23 05:30:47,632 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-23 05:30:47,632 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2022-07-23 05:30:47,632 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961339352] [2022-07-23 05:30:47,632 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-23 05:30:47,633 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-07-23 05:30:47,633 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-23 05:30:47,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-07-23 05:30:47,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=51, Unknown=1, NotChecked=0, Total=72 [2022-07-23 05:30:47,633 INFO L87 Difference]: Start difference. First operand 249 states and 297 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) [2022-07-23 05:30:48,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-23 05:30:48,094 INFO L93 Difference]: Finished difference Result 254 states and 308 transitions. [2022-07-23 05:30:48,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-07-23 05:30:48,095 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 [2022-07-23 05:30:48,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-23 05:30:48,096 INFO L225 Difference]: With dead ends: 254 [2022-07-23 05:30:48,096 INFO L226 Difference]: Without dead ends: 254 [2022-07-23 05:30:48,096 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 80 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=27, Invalid=62, Unknown=1, NotChecked=0, Total=90 [2022-07-23 05:30:48,096 INFO L413 NwaCegarLoop]: 174 mSDtfsCounter, 115 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 342 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 466 SdHoareTripleChecker+Invalid, 543 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 342 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 155 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-07-23 05:30:48,096 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [121 Valid, 466 Invalid, 543 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 342 Invalid, 0 Unknown, 155 Unchecked, 0.4s Time] [2022-07-23 05:30:48,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2022-07-23 05:30:48,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 250. [2022-07-23 05:30:48,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 250 states, 146 states have (on average 1.5410958904109588) internal successors, (225), 205 states have internal predecessors, (225), 29 states have call successors, (29), 11 states have call predecessors, (29), 15 states have return successors, (45), 33 states have call predecessors, (45), 29 states have call successors, (45) [2022-07-23 05:30:48,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 299 transitions. [2022-07-23 05:30:48,101 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 299 transitions. Word has length 45 [2022-07-23 05:30:48,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-23 05:30:48,102 INFO L495 AbstractCegarLoop]: Abstraction has 250 states and 299 transitions. [2022-07-23 05:30:48,102 INFO L496 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) [2022-07-23 05:30:48,102 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 299 transitions. [2022-07-23 05:30:48,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-07-23 05:30:48,102 INFO L187 NwaCegarLoop]: Found error trace [2022-07-23 05:30:48,102 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-07-23 05:30:48,113 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2022-07-23 05:30:48,315 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Forceful destruction successful, exit code 0 [2022-07-23 05:30:48,512 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2022-07-23 05:30:48,512 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting nondet_treeErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-23 05:30:48,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-23 05:30:48,512 INFO L85 PathProgramCache]: Analyzing trace with hash 324404478, now seen corresponding path program 1 times [2022-07-23 05:30:48,513 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-23 05:30:48,513 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [445934827] [2022-07-23 05:30:48,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-23 05:30:48,513 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-23 05:30:48,513 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-23 05:30:48,514 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-23 05:30:48,514 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2022-07-23 05:30:48,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-23 05:30:48,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 13 conjunts are in the unsatisfiable core [2022-07-23 05:30:48,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:30:48,647 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:30:48,761 INFO L356 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-07-23 05:30:48,761 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 18 treesize of output 25 [2022-07-23 05:30:48,766 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-07-23 05:30:48,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-23 05:30:48,855 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-23 05:30:48,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [445934827] [2022-07-23 05:30:48,856 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [445934827] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-23 05:30:48,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1397154959] [2022-07-23 05:30:48,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-23 05:30:48,856 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-23 05:30:48,856 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-23 05:30:48,862 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-07-23 05:30:48,866 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2022-07-23 05:30:49,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-23 05:30:49,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 14 conjunts are in the unsatisfiable core [2022-07-23 05:30:49,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:30:49,030 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:30:51,095 INFO L356 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2022-07-23 05:30:51,096 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 17 [2022-07-23 05:30:51,101 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-07-23 05:30:51,102 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-23 05:30:51,178 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1397154959] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-23 05:30:51,178 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-23 05:30:51,178 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2022-07-23 05:30:51,178 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519598586] [2022-07-23 05:30:51,178 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-23 05:30:51,179 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-07-23 05:30:51,179 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-23 05:30:51,179 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-07-23 05:30:51,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=27, Unknown=1, NotChecked=0, Total=42 [2022-07-23 05:30:51,179 INFO L87 Difference]: Start difference. First operand 250 states and 299 transitions. Second operand has 6 states, 5 states have (on average 5.2) internal successors, (26), 6 states have internal predecessors, (26), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2022-07-23 05:30:55,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-23 05:30:55,520 INFO L93 Difference]: Finished difference Result 253 states and 307 transitions. [2022-07-23 05:30:55,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-23 05:30:55,521 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.2) internal successors, (26), 6 states have internal predecessors, (26), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 31 [2022-07-23 05:30:55,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-23 05:30:55,522 INFO L225 Difference]: With dead ends: 253 [2022-07-23 05:30:55,522 INFO L226 Difference]: Without dead ends: 253 [2022-07-23 05:30:55,522 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 62 SyntacticMatches, 7 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=26, Invalid=44, Unknown=2, NotChecked=0, Total=72 [2022-07-23 05:30:55,522 INFO L413 NwaCegarLoop]: 184 mSDtfsCounter, 58 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 452 SdHoareTripleChecker+Invalid, 532 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 304 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-23 05:30:55,523 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [64 Valid, 452 Invalid, 532 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 209 Invalid, 0 Unknown, 304 Unchecked, 0.3s Time] [2022-07-23 05:30:55,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2022-07-23 05:30:55,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 249. [2022-07-23 05:30:55,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 145 states have (on average 1.5379310344827586) internal successors, (223), 205 states have internal predecessors, (223), 29 states have call successors, (29), 11 states have call predecessors, (29), 15 states have return successors, (45), 32 states have call predecessors, (45), 29 states have call successors, (45) [2022-07-23 05:30:55,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 297 transitions. [2022-07-23 05:30:55,532 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 297 transitions. Word has length 31 [2022-07-23 05:30:55,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-23 05:30:55,532 INFO L495 AbstractCegarLoop]: Abstraction has 249 states and 297 transitions. [2022-07-23 05:30:55,532 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.2) internal successors, (26), 6 states have internal predecessors, (26), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2022-07-23 05:30:55,532 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 297 transitions. [2022-07-23 05:30:55,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-07-23 05:30:55,533 INFO L187 NwaCegarLoop]: Found error trace [2022-07-23 05:30:55,533 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1] [2022-07-23 05:30:55,543 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (20)] Ended with exit code 0 [2022-07-23 05:30:55,746 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Ended with exit code 0 [2022-07-23 05:30:55,939 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-23 05:30:55,940 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-23 05:30:55,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-23 05:30:55,940 INFO L85 PathProgramCache]: Analyzing trace with hash -1380718298, now seen corresponding path program 2 times [2022-07-23 05:30:55,940 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-23 05:30:55,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1695241243] [2022-07-23 05:30:55,941 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-23 05:30:55,941 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-23 05:30:55,941 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-23 05:30:55,942 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-23 05:30:55,943 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2022-07-23 05:30:56,143 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-23 05:30:56,143 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-23 05:30:56,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 17 conjunts are in the unsatisfiable core [2022-07-23 05:30:56,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:30:56,157 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:31:00,370 INFO L356 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2022-07-23 05:31:00,370 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 21 treesize of output 37 [2022-07-23 05:31:00,405 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 41 proven. 27 refuted. 3 times theorem prover too weak. 19 trivial. 0 not checked. [2022-07-23 05:31:00,405 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-23 05:31:02,659 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-23 05:31:02,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1695241243] [2022-07-23 05:31:02,659 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1695241243] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-23 05:31:02,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2019735280] [2022-07-23 05:31:02,659 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-23 05:31:02,659 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-23 05:31:02,660 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-23 05:31:02,661 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-07-23 05:31:02,662 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2022-07-23 05:31:02,873 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-23 05:31:02,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [400678091] [2022-07-23 05:31:02,873 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-23 05:31:02,874 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-23 05:31:02,874 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-23 05:31:02,875 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-23 05:31:02,878 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 1 [2022-07-23 05:31:02,880 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-07-23 05:31:03,028 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-23 05:31:03,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-23 05:31:03,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 17 conjunts are in the unsatisfiable core [2022-07-23 05:31:03,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:31:03,038 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:31:11,264 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-23 05:31:11,286 INFO L356 Elim1Store]: treesize reduction 24, result has 46.7 percent of original size [2022-07-23 05:31:11,287 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 29 [2022-07-23 05:31:11,299 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 41 proven. 27 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-07-23 05:31:11,299 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-23 05:31:11,441 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [400678091] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-23 05:31:11,441 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-23 05:31:11,442 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2022-07-23 05:31:11,442 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852795050] [2022-07-23 05:31:11,442 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-23 05:31:11,442 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-23 05:31:11,442 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-23 05:31:11,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-23 05:31:11,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=96, Unknown=5, NotChecked=0, Total=132 [2022-07-23 05:31:11,442 INFO L87 Difference]: Start difference. First operand 249 states and 297 transitions. Second operand has 10 states, 9 states have (on average 4.444444444444445) internal successors, (40), 9 states have internal predecessors, (40), 7 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2022-07-23 05:31:38,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-23 05:31:38,409 INFO L93 Difference]: Finished difference Result 287 states and 354 transitions. [2022-07-23 05:31:38,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-07-23 05:31:38,410 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 4.444444444444445) internal successors, (40), 9 states have internal predecessors, (40), 7 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) Word has length 49 [2022-07-23 05:31:38,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-23 05:31:38,411 INFO L225 Difference]: With dead ends: 287 [2022-07-23 05:31:38,411 INFO L226 Difference]: Without dead ends: 287 [2022-07-23 05:31:38,411 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 91 SyntacticMatches, 6 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 41.2s TimeCoverageRelationStatistics Valid=92, Invalid=201, Unknown=13, NotChecked=0, Total=306 [2022-07-23 05:31:38,412 INFO L413 NwaCegarLoop]: 215 mSDtfsCounter, 11 mSDsluCounter, 527 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 742 SdHoareTripleChecker+Invalid, 662 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 587 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-23 05:31:38,412 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 742 Invalid, 662 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 72 Invalid, 0 Unknown, 587 Unchecked, 0.2s Time] [2022-07-23 05:31:38,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2022-07-23 05:31:38,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 286. [2022-07-23 05:31:38,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 171 states have (on average 1.4795321637426901) internal successors, (253), 232 states have internal predecessors, (253), 34 states have call successors, (34), 14 states have call predecessors, (34), 21 states have return successors, (67), 39 states have call predecessors, (67), 34 states have call successors, (67) [2022-07-23 05:31:38,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 354 transitions. [2022-07-23 05:31:38,426 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 354 transitions. Word has length 49 [2022-07-23 05:31:38,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-23 05:31:38,427 INFO L495 AbstractCegarLoop]: Abstraction has 286 states and 354 transitions. [2022-07-23 05:31:38,427 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 4.444444444444445) internal successors, (40), 9 states have internal predecessors, (40), 7 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2022-07-23 05:31:38,428 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 354 transitions. [2022-07-23 05:31:38,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-07-23 05:31:38,428 INFO L187 NwaCegarLoop]: Found error trace [2022-07-23 05:31:38,428 INFO L195 NwaCegarLoop]: trace histogram [7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 1, 1, 1, 1] [2022-07-23 05:31:38,438 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2022-07-23 05:31:38,654 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-07-23 05:31:38,836 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-23 05:31:38,837 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting nondet_treeErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-23 05:31:38,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-23 05:31:38,837 INFO L85 PathProgramCache]: Analyzing trace with hash -1701152456, now seen corresponding path program 2 times [2022-07-23 05:31:38,837 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-23 05:31:38,837 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1392549331] [2022-07-23 05:31:38,837 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-23 05:31:38,837 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-23 05:31:38,837 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-23 05:31:38,838 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-23 05:31:38,839 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2022-07-23 05:31:39,089 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-23 05:31:39,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-23 05:31:39,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 26 conjunts are in the unsatisfiable core [2022-07-23 05:31:39,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:31:39,107 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:31:39,110 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:31:43,320 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-23 05:31:43,340 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-07-23 05:31:43,340 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2022-07-23 05:31:43,350 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-23 05:31:43,350 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 12 [2022-07-23 05:31:43,386 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 48 proven. 54 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-07-23 05:31:43,386 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-23 05:31:43,648 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-23 05:31:43,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1392549331] [2022-07-23 05:31:43,649 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1392549331] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-23 05:31:43,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [561733235] [2022-07-23 05:31:43,649 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-23 05:31:43,649 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-23 05:31:43,649 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-23 05:31:43,650 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-07-23 05:31:43,651 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2022-07-23 05:31:43,898 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-23 05:31:43,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-23 05:31:43,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 26 conjunts are in the unsatisfiable core [2022-07-23 05:31:43,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:31:43,914 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:31:43,917 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:31:48,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-23 05:31:48,146 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-07-23 05:31:48,146 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2022-07-23 05:31:48,156 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-23 05:31:48,156 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 12 [2022-07-23 05:31:48,195 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 48 proven. 54 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-07-23 05:31:48,195 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-23 05:31:48,793 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [561733235] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-23 05:31:48,793 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-23 05:31:48,793 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2022-07-23 05:31:48,793 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843689278] [2022-07-23 05:31:48,793 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-23 05:31:48,793 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-07-23 05:31:48,794 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-23 05:31:48,794 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-07-23 05:31:48,794 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=85, Unknown=1, NotChecked=0, Total=110 [2022-07-23 05:31:48,794 INFO L87 Difference]: Start difference. First operand 286 states and 354 transitions. Second operand has 9 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 4 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) [2022-07-23 05:31:49,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-23 05:31:49,328 INFO L93 Difference]: Finished difference Result 292 states and 371 transitions. [2022-07-23 05:31:49,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-07-23 05:31:49,329 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 4 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) Word has length 55 [2022-07-23 05:31:49,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-23 05:31:49,330 INFO L225 Difference]: With dead ends: 292 [2022-07-23 05:31:49,330 INFO L226 Difference]: Without dead ends: 292 [2022-07-23 05:31:49,331 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 98 SyntacticMatches, 7 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=33, Invalid=98, Unknown=1, NotChecked=0, Total=132 [2022-07-23 05:31:49,331 INFO L413 NwaCegarLoop]: 174 mSDtfsCounter, 60 mSDsluCounter, 430 mSDsCounter, 0 mSdLazyCounter, 263 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 604 SdHoareTripleChecker+Invalid, 702 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 419 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-07-23 05:31:49,331 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 604 Invalid, 702 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 263 Invalid, 0 Unknown, 419 Unchecked, 0.5s Time] [2022-07-23 05:31:49,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2022-07-23 05:31:49,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 291. [2022-07-23 05:31:49,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 291 states, 175 states have (on average 1.4742857142857142) internal successors, (258), 235 states have internal predecessors, (258), 34 states have call successors, (34), 14 states have call predecessors, (34), 22 states have return successors, (79), 41 states have call predecessors, (79), 34 states have call successors, (79) [2022-07-23 05:31:49,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 371 transitions. [2022-07-23 05:31:49,337 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 371 transitions. Word has length 55 [2022-07-23 05:31:49,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-23 05:31:49,337 INFO L495 AbstractCegarLoop]: Abstraction has 291 states and 371 transitions. [2022-07-23 05:31:49,337 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 4 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) [2022-07-23 05:31:49,337 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 371 transitions. [2022-07-23 05:31:49,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-07-23 05:31:49,338 INFO L187 NwaCegarLoop]: Found error trace [2022-07-23 05:31:49,338 INFO L195 NwaCegarLoop]: trace histogram [7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 1, 1, 1, 1] [2022-07-23 05:31:49,346 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2022-07-23 05:31:49,548 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2022-07-23 05:31:49,739 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-23 05:31:49,739 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting nondet_treeErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-23 05:31:49,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-23 05:31:49,740 INFO L85 PathProgramCache]: Analyzing trace with hash -1701152457, now seen corresponding path program 2 times [2022-07-23 05:31:49,740 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-23 05:31:49,740 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1417873273] [2022-07-23 05:31:49,740 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-23 05:31:49,740 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-23 05:31:49,740 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-23 05:31:49,741 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-23 05:31:49,742 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2022-07-23 05:31:49,968 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-23 05:31:49,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-23 05:31:49,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 19 conjunts are in the unsatisfiable core [2022-07-23 05:31:49,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:31:49,993 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:31:54,193 INFO L356 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2022-07-23 05:31:54,194 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 21 treesize of output 37 [2022-07-23 05:31:54,223 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 48 proven. 34 refuted. 6 times theorem prover too weak. 30 trivial. 0 not checked. [2022-07-23 05:31:54,223 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-23 05:31:56,313 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1431 (_ BitVec 1)) (v_nondet_tree_~n~0.base_108 (_ BitVec 32)) (v_nondet_tree_~n~0.base_109 (_ BitVec 32))) (or (= (select (store (store |c_#valid| v_nondet_tree_~n~0.base_108 v_ArrVal_1431) v_nondet_tree_~n~0.base_109 (_ bv1 1)) c_nondet_tree_~n~0.base) (_ bv1 1)) (not (= (_ bv0 1) (bvneg (bvneg (select |c_#valid| v_nondet_tree_~n~0.base_108))))))) is different from false [2022-07-23 05:31:56,315 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-23 05:31:56,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1417873273] [2022-07-23 05:31:56,315 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1417873273] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-23 05:31:56,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [439727073] [2022-07-23 05:31:56,316 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-23 05:31:56,316 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-23 05:31:56,316 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-23 05:31:56,317 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-07-23 05:31:56,327 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2022-07-23 05:31:56,564 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-23 05:31:56,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [914440763] [2022-07-23 05:31:56,565 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-23 05:31:56,565 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-23 05:31:56,565 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-23 05:31:56,566 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-23 05:31:56,568 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (27)] Ended with exit code 1 [2022-07-23 05:31:56,568 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-07-23 05:31:56,714 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-23 05:31:56,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-23 05:31:56,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 16 conjunts are in the unsatisfiable core [2022-07-23 05:31:56,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:32:04,942 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-23 05:32:04,961 INFO L356 Elim1Store]: treesize reduction 24, result has 46.7 percent of original size [2022-07-23 05:32:04,961 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 29 [2022-07-23 05:32:04,971 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 62 proven. 24 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-07-23 05:32:04,971 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-23 05:32:05,731 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [914440763] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-23 05:32:05,731 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-23 05:32:05,731 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2022-07-23 05:32:05,731 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728995284] [2022-07-23 05:32:05,731 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-23 05:32:05,732 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-23 05:32:05,732 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-23 05:32:05,732 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-23 05:32:05,732 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=103, Unknown=6, NotChecked=22, Total=182 [2022-07-23 05:32:05,732 INFO L87 Difference]: Start difference. First operand 291 states and 371 transitions. Second operand has 10 states, 9 states have (on average 4.777777777777778) internal successors, (43), 9 states have internal predecessors, (43), 5 states have call successors, (11), 2 states have call predecessors, (11), 5 states have return successors, (10), 7 states have call predecessors, (10), 5 states have call successors, (10) [2022-07-23 05:32:14,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-23 05:32:14,247 INFO L93 Difference]: Finished difference Result 293 states and 372 transitions. [2022-07-23 05:32:14,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-07-23 05:32:14,247 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 4.777777777777778) internal successors, (43), 9 states have internal predecessors, (43), 5 states have call successors, (11), 2 states have call predecessors, (11), 5 states have return successors, (10), 7 states have call predecessors, (10), 5 states have call successors, (10) Word has length 55 [2022-07-23 05:32:14,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-23 05:32:14,248 INFO L225 Difference]: With dead ends: 293 [2022-07-23 05:32:14,249 INFO L226 Difference]: Without dead ends: 293 [2022-07-23 05:32:14,249 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 100 SyntacticMatches, 6 SemanticMatches, 14 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 23.0s TimeCoverageRelationStatistics Valid=72, Invalid=135, Unknown=7, NotChecked=26, Total=240 [2022-07-23 05:32:14,249 INFO L413 NwaCegarLoop]: 181 mSDtfsCounter, 64 mSDsluCounter, 448 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 629 SdHoareTripleChecker+Invalid, 877 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 653 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-23 05:32:14,249 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 629 Invalid, 877 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 205 Invalid, 0 Unknown, 653 Unchecked, 0.3s Time] [2022-07-23 05:32:14,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2022-07-23 05:32:14,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 290. [2022-07-23 05:32:14,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 290 states, 174 states have (on average 1.471264367816092) internal successors, (256), 235 states have internal predecessors, (256), 34 states have call successors, (34), 14 states have call predecessors, (34), 22 states have return successors, (79), 40 states have call predecessors, (79), 34 states have call successors, (79) [2022-07-23 05:32:14,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 369 transitions. [2022-07-23 05:32:14,255 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 369 transitions. Word has length 55 [2022-07-23 05:32:14,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-23 05:32:14,255 INFO L495 AbstractCegarLoop]: Abstraction has 290 states and 369 transitions. [2022-07-23 05:32:14,255 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 4.777777777777778) internal successors, (43), 9 states have internal predecessors, (43), 5 states have call successors, (11), 2 states have call predecessors, (11), 5 states have return successors, (10), 7 states have call predecessors, (10), 5 states have call successors, (10) [2022-07-23 05:32:14,255 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 369 transitions. [2022-07-23 05:32:14,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-07-23 05:32:14,255 INFO L187 NwaCegarLoop]: Found error trace [2022-07-23 05:32:14,256 INFO L195 NwaCegarLoop]: trace histogram [7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 1, 1, 1, 1] [2022-07-23 05:32:14,276 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-07-23 05:32:14,467 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2022-07-23 05:32:14,656 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-23 05:32:14,656 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting nondet_treeErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-23 05:32:14,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-23 05:32:14,657 INFO L85 PathProgramCache]: Analyzing trace with hash 2037994168, now seen corresponding path program 3 times [2022-07-23 05:32:14,657 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-23 05:32:14,657 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [630196446] [2022-07-23 05:32:14,657 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-23 05:32:14,657 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-23 05:32:14,657 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-23 05:32:14,658 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-23 05:32:14,659 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2022-07-23 05:32:14,931 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-07-23 05:32:14,931 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-23 05:32:14,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 23 conjunts are in the unsatisfiable core [2022-07-23 05:32:14,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:32:14,949 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:32:19,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-23 05:32:19,225 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-07-23 05:32:19,225 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2022-07-23 05:32:19,236 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-23 05:32:19,237 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 12 [2022-07-23 05:32:19,249 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 49 proven. 44 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-07-23 05:32:19,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-23 05:32:19,525 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-23 05:32:19,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [630196446] [2022-07-23 05:32:19,526 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [630196446] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-23 05:32:19,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1935373883] [2022-07-23 05:32:19,527 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-23 05:32:19,527 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-23 05:32:19,527 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-23 05:32:19,528 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-07-23 05:32:19,529 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2022-07-23 05:32:19,896 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-07-23 05:32:19,897 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-23 05:32:19,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 32 conjunts are in the unsatisfiable core [2022-07-23 05:32:19,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:32:19,915 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-07-23 05:32:55,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-23 05:32:55,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-23 05:32:55,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-23 05:32:55,646 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 19 [2022-07-23 05:32:55,675 INFO L356 Elim1Store]: treesize reduction 16, result has 36.0 percent of original size [2022-07-23 05:32:55,675 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 22 treesize of output 24 [2022-07-23 05:32:55,686 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 48 proven. 55 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-07-23 05:32:55,686 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-23 05:32:56,746 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1935373883] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-23 05:32:56,747 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-23 05:32:56,747 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10] total 13 [2022-07-23 05:32:56,747 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [243092302] [2022-07-23 05:32:56,747 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-23 05:32:56,747 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-07-23 05:32:56,747 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-23 05:32:56,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-07-23 05:32:56,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=220, Unknown=10, NotChecked=0, Total=272 [2022-07-23 05:32:56,748 INFO L87 Difference]: Start difference. First operand 290 states and 369 transitions. Second operand has 14 states, 13 states have (on average 3.923076923076923) internal successors, (51), 13 states have internal predecessors, (51), 9 states have call successors, (14), 3 states have call predecessors, (14), 7 states have return successors, (13), 7 states have call predecessors, (13), 9 states have call successors, (13) [2022-07-23 05:34:00,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-23 05:34:00,711 INFO L93 Difference]: Finished difference Result 332 states and 441 transitions. [2022-07-23 05:34:00,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-07-23 05:34:00,712 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 3.923076923076923) internal successors, (51), 13 states have internal predecessors, (51), 9 states have call successors, (14), 3 states have call predecessors, (14), 7 states have return successors, (13), 7 states have call predecessors, (13), 9 states have call successors, (13) Word has length 55 [2022-07-23 05:34:00,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-23 05:34:00,713 INFO L225 Difference]: With dead ends: 332 [2022-07-23 05:34:00,713 INFO L226 Difference]: Without dead ends: 332 [2022-07-23 05:34:00,713 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 99 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 104.1s TimeCoverageRelationStatistics Valid=143, Invalid=576, Unknown=37, NotChecked=0, Total=756 [2022-07-23 05:34:00,714 INFO L413 NwaCegarLoop]: 175 mSDtfsCounter, 116 mSDsluCounter, 463 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 638 SdHoareTripleChecker+Invalid, 807 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 568 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-07-23 05:34:00,714 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [122 Valid, 638 Invalid, 807 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 193 Invalid, 0 Unknown, 568 Unchecked, 0.4s Time] [2022-07-23 05:34:00,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 332 states. [2022-07-23 05:34:00,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 332 to 331. [2022-07-23 05:34:00,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 331 states, 203 states have (on average 1.4187192118226601) internal successors, (288), 265 states have internal predecessors, (288), 40 states have call successors, (40), 16 states have call predecessors, (40), 28 states have return successors, (113), 49 states have call predecessors, (113), 40 states have call successors, (113) [2022-07-23 05:34:00,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 331 states to 331 states and 441 transitions. [2022-07-23 05:34:00,721 INFO L78 Accepts]: Start accepts. Automaton has 331 states and 441 transitions. Word has length 55 [2022-07-23 05:34:00,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-23 05:34:00,721 INFO L495 AbstractCegarLoop]: Abstraction has 331 states and 441 transitions. [2022-07-23 05:34:00,721 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 3.923076923076923) internal successors, (51), 13 states have internal predecessors, (51), 9 states have call successors, (14), 3 states have call predecessors, (14), 7 states have return successors, (13), 7 states have call predecessors, (13), 9 states have call successors, (13) [2022-07-23 05:34:00,722 INFO L276 IsEmpty]: Start isEmpty. Operand 331 states and 441 transitions. [2022-07-23 05:34:00,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-07-23 05:34:00,722 INFO L187 NwaCegarLoop]: Found error trace [2022-07-23 05:34:00,722 INFO L195 NwaCegarLoop]: trace histogram [7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 1, 1, 1, 1] [2022-07-23 05:34:00,735 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2022-07-23 05:34:00,939 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (29)] Ended with exit code 0 [2022-07-23 05:34:01,127 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-23 05:34:01,128 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting nondet_treeErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-23 05:34:01,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-23 05:34:01,128 INFO L85 PathProgramCache]: Analyzing trace with hash 2037994167, now seen corresponding path program 3 times [2022-07-23 05:34:01,128 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-23 05:34:01,128 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [925981064] [2022-07-23 05:34:01,128 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-23 05:34:01,129 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-23 05:34:01,129 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-23 05:34:01,130 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-23 05:34:01,130 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2022-07-23 05:34:01,451 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-07-23 05:34:01,451 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-23 05:34:01,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 16 conjunts are in the unsatisfiable core [2022-07-23 05:34:01,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:34:11,875 INFO L356 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2022-07-23 05:34:11,875 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 21 treesize of output 37 [2022-07-23 05:34:11,959 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 62 proven. 26 refuted. 2 times theorem prover too weak. 28 trivial. 0 not checked. [2022-07-23 05:34:11,959 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-23 05:34:14,194 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-23 05:34:14,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [925981064] [2022-07-23 05:34:14,194 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [925981064] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-23 05:34:14,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1988786532] [2022-07-23 05:34:14,194 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-23 05:34:14,194 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-23 05:34:14,194 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-23 05:34:14,195 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-07-23 05:34:14,196 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2022-07-23 05:34:14,451 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-23 05:34:14,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [995587186] [2022-07-23 05:34:14,452 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-23 05:34:14,452 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-23 05:34:14,452 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-23 05:34:14,453 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-23 05:34:14,459 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (32)] Forceful destruction successful, exit code 1 [2022-07-23 05:34:14,460 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-07-23 05:34:16,861 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-07-23 05:34:16,861 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-23 05:34:16,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 16 conjunts are in the unsatisfiable core [2022-07-23 05:34:16,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-23 05:34:25,300 INFO L356 Elim1Store]: treesize reduction 34, result has 38.2 percent of original size [2022-07-23 05:34:25,301 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 29 [2022-07-23 05:34:25,327 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 62 proven. 25 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2022-07-23 05:34:25,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-23 05:34:25,604 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [995587186] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-23 05:34:25,604 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-23 05:34:25,604 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2022-07-23 05:34:25,604 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438722466] [2022-07-23 05:34:25,604 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-23 05:34:25,604 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-23 05:34:25,604 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-23 05:34:25,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-23 05:34:25,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=110, Unknown=5, NotChecked=0, Total=156 [2022-07-23 05:34:25,605 INFO L87 Difference]: Start difference. First operand 331 states and 441 transitions. Second operand has 10 states, 9 states have (on average 4.444444444444445) internal successors, (40), 10 states have internal predecessors, (40), 7 states have call successors, (11), 2 states have call predecessors, (11), 5 states have return successors, (11), 6 states have call predecessors, (11), 7 states have call successors, (11)