./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 f4b24e32 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-?-f4b24e3 [2022-07-14 05:54:23,061 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-14 05:54:23,063 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-14 05:54:23,090 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-14 05:54:23,094 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-14 05:54:23,095 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-14 05:54:23,097 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-14 05:54:23,100 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-14 05:54:23,103 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-14 05:54:23,104 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-14 05:54:23,104 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-14 05:54:23,105 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-14 05:54:23,106 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-14 05:54:23,106 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-14 05:54:23,108 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-14 05:54:23,109 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-14 05:54:23,110 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-14 05:54:23,113 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-14 05:54:23,115 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-14 05:54:23,116 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-14 05:54:23,117 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-14 05:54:23,121 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-14 05:54:23,122 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-14 05:54:23,123 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-14 05:54:23,124 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-14 05:54:23,127 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-14 05:54:23,130 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-14 05:54:23,130 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-14 05:54:23,131 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-14 05:54:23,132 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-14 05:54:23,132 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-14 05:54:23,133 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-14 05:54:23,134 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-14 05:54:23,134 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-14 05:54:23,135 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-14 05:54:23,136 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-14 05:54:23,136 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-14 05:54:23,136 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-14 05:54:23,136 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-14 05:54:23,137 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-14 05:54:23,137 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-14 05:54:23,139 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-14 05:54:23,140 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-32bit-Automizer_Default.epf [2022-07-14 05:54:23,158 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-14 05:54:23,159 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-14 05:54:23,159 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-14 05:54:23,159 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-14 05:54:23,160 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-07-14 05:54:23,160 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-07-14 05:54:23,160 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-14 05:54:23,160 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-14 05:54:23,160 INFO L138 SettingsManager]: * Use SBE=true [2022-07-14 05:54:23,161 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-14 05:54:23,161 INFO L138 SettingsManager]: * sizeof long=4 [2022-07-14 05:54:23,161 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-07-14 05:54:23,162 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-07-14 05:54:23,162 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-07-14 05:54:23,162 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-14 05:54:23,162 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-07-14 05:54:23,162 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-07-14 05:54:23,162 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-07-14 05:54:23,162 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-07-14 05:54:23,163 INFO L138 SettingsManager]: * sizeof long double=12 [2022-07-14 05:54:23,163 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-14 05:54:23,163 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-14 05:54:23,163 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-14 05:54:23,163 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-07-14 05:54:23,164 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-14 05:54:23,164 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-14 05:54:23,164 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-07-14 05:54:23,164 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-07-14 05:54:23,164 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-07-14 05:54:23,164 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cce1bb7a06b9dd56fbf663e182ffe801720ee05ee19a126a08070f1616bc4afe [2022-07-14 05:54:23,386 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-14 05:54:23,412 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-14 05:54:23,414 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-14 05:54:23,414 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-14 05:54:23,415 INFO L275 PluginConnector]: CDTParser initialized [2022-07-14 05:54:23,416 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/verifythis/tree_del_iter.c [2022-07-14 05:54:23,472 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0deea47ec/c37e9f5d50704a428a486d50ca28e432/FLAG1efe81ad5 [2022-07-14 05:54:23,847 INFO L306 CDTParser]: Found 1 translation units. [2022-07-14 05:54:23,848 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_del_iter.c [2022-07-14 05:54:23,853 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0deea47ec/c37e9f5d50704a428a486d50ca28e432/FLAG1efe81ad5 [2022-07-14 05:54:24,270 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0deea47ec/c37e9f5d50704a428a486d50ca28e432 [2022-07-14 05:54:24,272 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-14 05:54:24,273 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-14 05:54:24,281 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-14 05:54:24,281 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-14 05:54:24,283 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-14 05:54:24,284 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.07 05:54:24" (1/1) ... [2022-07-14 05:54:24,284 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@28e58938 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:24, skipping insertion in model container [2022-07-14 05:54:24,285 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.07 05:54:24" (1/1) ... [2022-07-14 05:54:24,289 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-14 05:54:24,314 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-14 05:54:24,458 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] [2022-07-14 05:54:24,474 WARN L1550 CHandler]: Possible shadowing of function min [2022-07-14 05:54:24,488 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-14 05:54:24,497 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) [2022-07-14 05:54:24,498 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@18102db3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:24, skipping insertion in model container [2022-07-14 05:54:24,498 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-14 05:54:24,499 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2022-07-14 05:54:24,500 INFO L158 Benchmark]: Toolchain (without parser) took 226.09ms. Allocated memory is still 111.1MB. Free memory was 81.0MB in the beginning and 86.6MB in the end (delta: -5.5MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2022-07-14 05:54:24,501 INFO L158 Benchmark]: CDTParser took 0.19ms. Allocated memory is still 111.1MB. Free memory was 66.8MB in the beginning and 66.8MB in the end (delta: 50.7kB). There was no memory consumed. Max. memory is 16.1GB. [2022-07-14 05:54:24,502 INFO L158 Benchmark]: CACSL2BoogieTranslator took 217.70ms. Allocated memory is still 111.1MB. Free memory was 80.7MB in the beginning and 86.6MB in the end (delta: -5.9MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2022-07-14 05:54:24,503 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19ms. Allocated memory is still 111.1MB. Free memory was 66.8MB in the beginning and 66.8MB in the end (delta: 50.7kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 217.70ms. Allocated memory is still 111.1MB. Free memory was 80.7MB in the beginning and 86.6MB in the end (delta: -5.9MB). 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-?-f4b24e3 [2022-07-14 05:54:26,006 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-14 05:54:26,007 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-14 05:54:26,029 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-14 05:54:26,030 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-14 05:54:26,031 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-14 05:54:26,032 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-14 05:54:26,033 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-14 05:54:26,034 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-14 05:54:26,034 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-14 05:54:26,035 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-14 05:54:26,036 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-14 05:54:26,036 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-14 05:54:26,039 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-14 05:54:26,040 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-14 05:54:26,044 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-14 05:54:26,045 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-14 05:54:26,045 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-14 05:54:26,046 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-14 05:54:26,047 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-14 05:54:26,050 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-14 05:54:26,051 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-14 05:54:26,051 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-14 05:54:26,053 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-14 05:54:26,055 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-14 05:54:26,058 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-14 05:54:26,063 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-14 05:54:26,064 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-14 05:54:26,064 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-14 05:54:26,064 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-14 05:54:26,065 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-14 05:54:26,065 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-14 05:54:26,068 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-14 05:54:26,068 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-14 05:54:26,069 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-14 05:54:26,070 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-14 05:54:26,072 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-14 05:54:26,073 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-14 05:54:26,073 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-14 05:54:26,073 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-14 05:54:26,074 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-14 05:54:26,074 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-14 05:54:26,076 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-32bit-Automizer_Bitvector.epf [2022-07-14 05:54:26,091 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-14 05:54:26,091 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-14 05:54:26,092 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-14 05:54:26,092 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-14 05:54:26,092 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-07-14 05:54:26,092 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-07-14 05:54:26,093 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-14 05:54:26,093 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-14 05:54:26,093 INFO L138 SettingsManager]: * Use SBE=true [2022-07-14 05:54:26,093 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-14 05:54:26,093 INFO L138 SettingsManager]: * sizeof long=4 [2022-07-14 05:54:26,094 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-07-14 05:54:26,094 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-07-14 05:54:26,094 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-07-14 05:54:26,103 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-14 05:54:26,104 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-07-14 05:54:26,104 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-07-14 05:54:26,104 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-07-14 05:54:26,104 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-07-14 05:54:26,104 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2022-07-14 05:54:26,104 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2022-07-14 05:54:26,105 INFO L138 SettingsManager]: * sizeof long double=12 [2022-07-14 05:54:26,105 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-14 05:54:26,105 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-14 05:54:26,105 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-14 05:54:26,105 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-07-14 05:54:26,106 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-14 05:54:26,106 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-14 05:54:26,106 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-07-14 05:54:26,106 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2022-07-14 05:54:26,107 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2022-07-14 05:54:26,107 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-07-14 05:54:26,107 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cce1bb7a06b9dd56fbf663e182ffe801720ee05ee19a126a08070f1616bc4afe [2022-07-14 05:54:26,365 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-14 05:54:26,380 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-14 05:54:26,381 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-14 05:54:26,382 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-14 05:54:26,383 INFO L275 PluginConnector]: CDTParser initialized [2022-07-14 05:54:26,384 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/verifythis/tree_del_iter.c [2022-07-14 05:54:26,429 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/62adb7e6b/587ba3d4ff2848ad9be93a7ec68791f0/FLAG68395d2d8 [2022-07-14 05:54:26,802 INFO L306 CDTParser]: Found 1 translation units. [2022-07-14 05:54:26,802 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_del_iter.c [2022-07-14 05:54:26,810 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/62adb7e6b/587ba3d4ff2848ad9be93a7ec68791f0/FLAG68395d2d8 [2022-07-14 05:54:26,822 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/62adb7e6b/587ba3d4ff2848ad9be93a7ec68791f0 [2022-07-14 05:54:26,823 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-14 05:54:26,824 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-14 05:54:26,827 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-14 05:54:26,827 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-14 05:54:26,829 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-14 05:54:26,830 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.07 05:54:26" (1/1) ... [2022-07-14 05:54:26,831 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@65174e7e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:26, skipping insertion in model container [2022-07-14 05:54:26,831 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.07 05:54:26" (1/1) ... [2022-07-14 05:54:26,836 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-14 05:54:26,850 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-14 05:54:26,949 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] [2022-07-14 05:54:26,962 WARN L1550 CHandler]: Possible shadowing of function min [2022-07-14 05:54:26,983 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-14 05:54:27,015 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2022-07-14 05:54:27,029 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-14 05:54:27,034 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] [2022-07-14 05:54:27,049 WARN L1550 CHandler]: Possible shadowing of function min [2022-07-14 05:54:27,055 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-14 05:54:27,060 INFO L203 MainTranslator]: Completed pre-run [2022-07-14 05:54:27,073 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] [2022-07-14 05:54:27,087 WARN L1550 CHandler]: Possible shadowing of function min [2022-07-14 05:54:27,096 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-14 05:54:27,112 INFO L208 MainTranslator]: Completed translation [2022-07-14 05:54:27,113 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:27 WrapperNode [2022-07-14 05:54:27,113 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-14 05:54:27,114 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-07-14 05:54:27,115 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-07-14 05:54:27,115 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-07-14 05:54:27,120 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:27" (1/1) ... [2022-07-14 05:54:27,142 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:27" (1/1) ... [2022-07-14 05:54:27,172 INFO L137 Inliner]: procedures = 31, calls = 64, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 122 [2022-07-14 05:54:27,173 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-07-14 05:54:27,175 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-07-14 05:54:27,175 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-07-14 05:54:27,175 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-07-14 05:54:27,181 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:27" (1/1) ... [2022-07-14 05:54:27,181 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:27" (1/1) ... [2022-07-14 05:54:27,196 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:27" (1/1) ... [2022-07-14 05:54:27,198 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:27" (1/1) ... [2022-07-14 05:54:27,211 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:27" (1/1) ... [2022-07-14 05:54:27,219 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:27" (1/1) ... [2022-07-14 05:54:27,220 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:27" (1/1) ... [2022-07-14 05:54:27,228 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-07-14 05:54:27,229 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-07-14 05:54:27,233 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-07-14 05:54:27,234 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-07-14 05:54:27,235 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:27" (1/1) ... [2022-07-14 05:54:27,240 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-14 05:54:27,249 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-14 05:54:27,265 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) [2022-07-14 05:54:27,296 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 [2022-07-14 05:54:27,308 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-07-14 05:54:27,309 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2022-07-14 05:54:27,309 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-07-14 05:54:27,309 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-07-14 05:54:27,309 INFO L130 BoogieDeclarations]: Found specification of procedure min [2022-07-14 05:54:27,309 INFO L138 BoogieDeclarations]: Found implementation of procedure min [2022-07-14 05:54:27,309 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2022-07-14 05:54:27,310 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2022-07-14 05:54:27,310 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2022-07-14 05:54:27,310 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-07-14 05:54:27,310 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2022-07-14 05:54:27,310 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2022-07-14 05:54:27,310 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-07-14 05:54:27,311 INFO L130 BoogieDeclarations]: Found specification of procedure size [2022-07-14 05:54:27,311 INFO L138 BoogieDeclarations]: Found implementation of procedure size [2022-07-14 05:54:27,311 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-07-14 05:54:27,311 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-07-14 05:54:27,311 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-07-14 05:54:27,312 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-07-14 05:54:27,312 INFO L130 BoogieDeclarations]: Found specification of procedure tree_inorder [2022-07-14 05:54:27,312 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_inorder [2022-07-14 05:54:27,312 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-07-14 05:54:27,312 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2022-07-14 05:54:27,471 INFO L234 CfgBuilder]: Building ICFG [2022-07-14 05:54:27,472 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-07-14 05:54:27,979 INFO L275 CfgBuilder]: Performing block encoding [2022-07-14 05:54:27,985 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-07-14 05:54:27,985 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2022-07-14 05:54:27,986 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.07 05:54:27 BoogieIcfgContainer [2022-07-14 05:54:27,986 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-07-14 05:54:27,988 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-07-14 05:54:27,988 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-07-14 05:54:27,990 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-07-14 05:54:27,990 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.07 05:54:26" (1/3) ... [2022-07-14 05:54:27,990 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14abb103 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.07 05:54:27, skipping insertion in model container [2022-07-14 05:54:27,991 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:27" (2/3) ... [2022-07-14 05:54:27,991 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14abb103 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.07 05:54:27, skipping insertion in model container [2022-07-14 05:54:27,991 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.07 05:54:27" (3/3) ... [2022-07-14 05:54:27,992 INFO L111 eAbstractionObserver]: Analyzing ICFG tree_del_iter.c [2022-07-14 05:54:28,002 INFO L201 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-07-14 05:54:28,002 INFO L160 ceAbstractionStarter]: Applying trace abstraction to program that has 64 error locations. [2022-07-14 05:54:28,043 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-14 05:54:28,060 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@115766b, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@1cd514ca [2022-07-14 05:54:28,061 INFO L358 AbstractCegarLoop]: Starting to check reachability of 64 error locations. [2022-07-14 05:54:28,067 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) [2022-07-14 05:54:28,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-07-14 05:54:28,075 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:54:28,075 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-07-14 05:54:28,076 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)] === [2022-07-14 05:54:28,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:54:28,081 INFO L85 PathProgramCache]: Analyzing trace with hash 88048840, now seen corresponding path program 1 times [2022-07-14 05:54:28,091 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:54:28,091 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [719431267] [2022-07-14 05:54:28,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:54:28,093 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:54:28,093 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:54:28,095 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) [2022-07-14 05:54:28,096 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2022-07-14 05:54:28,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:54:28,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 3 conjunts are in the unsatisfiable core [2022-07-14 05:54:28,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:54:28,235 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 [2022-07-14 05:54:28,243 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-14 05:54:28,243 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-14 05:54:28,243 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:54:28,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [719431267] [2022-07-14 05:54:28,244 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [719431267] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-14 05:54:28,244 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-14 05:54:28,244 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-14 05:54:28,246 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208300091] [2022-07-14 05:54:28,246 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-14 05:54:28,249 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-14 05:54:28,250 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:54:28,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-14 05:54:28,273 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-14 05:54:28,277 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) [2022-07-14 05:54:28,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:54:28,499 INFO L93 Difference]: Finished difference Result 191 states and 216 transitions. [2022-07-14 05:54:28,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-14 05:54:28,502 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 [2022-07-14 05:54:28,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:54:28,510 INFO L225 Difference]: With dead ends: 191 [2022-07-14 05:54:28,512 INFO L226 Difference]: Without dead ends: 188 [2022-07-14 05:54:28,516 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 [2022-07-14 05:54:28,518 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 [2022-07-14 05:54:28,519 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] [2022-07-14 05:54:28,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2022-07-14 05:54:28,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 186. [2022-07-14 05:54:28,568 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) [2022-07-14 05:54:28,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 208 transitions. [2022-07-14 05:54:28,584 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 208 transitions. Word has length 5 [2022-07-14 05:54:28,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:54:28,585 INFO L495 AbstractCegarLoop]: Abstraction has 186 states and 208 transitions. [2022-07-14 05:54:28,585 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) [2022-07-14 05:54:28,585 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 208 transitions. [2022-07-14 05:54:28,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-07-14 05:54:28,586 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:54:28,586 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-07-14 05:54:28,595 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Ended with exit code 0 [2022-07-14 05:54:28,792 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-14 05:54:28,793 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)] === [2022-07-14 05:54:28,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:54:28,794 INFO L85 PathProgramCache]: Analyzing trace with hash 88048841, now seen corresponding path program 1 times [2022-07-14 05:54:28,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:54:28,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1639491208] [2022-07-14 05:54:28,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:54:28,795 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:54:28,795 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:54:28,797 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) [2022-07-14 05:54:28,799 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2022-07-14 05:54:28,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:54:28,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2022-07-14 05:54:28,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:54:28,851 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 [2022-07-14 05:54:28,861 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-14 05:54:28,861 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-14 05:54:28,861 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:54:28,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1639491208] [2022-07-14 05:54:28,861 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1639491208] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-14 05:54:28,868 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-14 05:54:28,868 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-14 05:54:28,868 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893804877] [2022-07-14 05:54:28,868 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-14 05:54:28,869 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-14 05:54:28,869 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:54:28,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-14 05:54:28,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-14 05:54:28,872 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) [2022-07-14 05:54:29,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:54:29,061 INFO L93 Difference]: Finished difference Result 185 states and 207 transitions. [2022-07-14 05:54:29,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-14 05:54:29,062 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 [2022-07-14 05:54:29,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:54:29,063 INFO L225 Difference]: With dead ends: 185 [2022-07-14 05:54:29,063 INFO L226 Difference]: Without dead ends: 185 [2022-07-14 05:54:29,063 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 [2022-07-14 05:54:29,064 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 [2022-07-14 05:54:29,064 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] [2022-07-14 05:54:29,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2022-07-14 05:54:29,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 185. [2022-07-14 05:54:29,070 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) [2022-07-14 05:54:29,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 207 transitions. [2022-07-14 05:54:29,071 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 207 transitions. Word has length 5 [2022-07-14 05:54:29,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:54:29,071 INFO L495 AbstractCegarLoop]: Abstraction has 185 states and 207 transitions. [2022-07-14 05:54:29,071 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) [2022-07-14 05:54:29,072 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 207 transitions. [2022-07-14 05:54:29,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-07-14 05:54:29,072 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:54:29,072 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-14 05:54:29,079 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2022-07-14 05:54:29,278 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-14 05:54:29,278 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting minErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-14 05:54:29,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:54:29,279 INFO L85 PathProgramCache]: Analyzing trace with hash -163614216, now seen corresponding path program 1 times [2022-07-14 05:54:29,279 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:54:29,280 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1821556282] [2022-07-14 05:54:29,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:54:29,280 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:54:29,280 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:54:29,281 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) [2022-07-14 05:54:29,281 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2022-07-14 05:54:29,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:54:29,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 13 conjunts are in the unsatisfiable core [2022-07-14 05:54:29,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:54:29,435 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-14 05:54:29,435 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-14 05:54:29,436 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:54:29,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1821556282] [2022-07-14 05:54:29,436 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1821556282] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-14 05:54:29,436 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-14 05:54:29,436 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-07-14 05:54:29,436 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127052281] [2022-07-14 05:54:29,436 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-14 05:54:29,437 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-07-14 05:54:29,437 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:54:29,437 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-07-14 05:54:29,437 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-07-14 05:54:29,437 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) [2022-07-14 05:54:29,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:54:29,610 INFO L93 Difference]: Finished difference Result 297 states and 335 transitions. [2022-07-14 05:54:29,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-14 05:54:29,611 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 [2022-07-14 05:54:29,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:54:29,612 INFO L225 Difference]: With dead ends: 297 [2022-07-14 05:54:29,613 INFO L226 Difference]: Without dead ends: 297 [2022-07-14 05:54:29,613 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 [2022-07-14 05:54:29,613 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 [2022-07-14 05:54:29,614 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] [2022-07-14 05:54:29,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2022-07-14 05:54:29,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 193. [2022-07-14 05:54:29,637 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) [2022-07-14 05:54:29,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 217 transitions. [2022-07-14 05:54:29,638 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 217 transitions. Word has length 11 [2022-07-14 05:54:29,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:54:29,639 INFO L495 AbstractCegarLoop]: Abstraction has 193 states and 217 transitions. [2022-07-14 05:54:29,639 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) [2022-07-14 05:54:29,639 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 217 transitions. [2022-07-14 05:54:29,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-07-14 05:54:29,639 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:54:29,639 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-14 05:54:29,648 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2022-07-14 05:54:29,846 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-14 05:54:29,846 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)] === [2022-07-14 05:54:29,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:54:29,847 INFO L85 PathProgramCache]: Analyzing trace with hash -916126343, now seen corresponding path program 1 times [2022-07-14 05:54:29,847 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:54:29,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [662974767] [2022-07-14 05:54:29,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:54:29,847 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:54:29,847 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:54:29,848 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) [2022-07-14 05:54:29,850 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2022-07-14 05:54:29,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:54:29,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 5 conjunts are in the unsatisfiable core [2022-07-14 05:54:29,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:54:29,910 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 [2022-07-14 05:54:29,931 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-14 05:54:29,932 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-14 05:54:29,932 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:54:29,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [662974767] [2022-07-14 05:54:29,932 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [662974767] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-14 05:54:29,932 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-14 05:54:29,933 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-14 05:54:29,933 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731174015] [2022-07-14 05:54:29,933 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-14 05:54:29,933 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-07-14 05:54:29,933 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:54:29,934 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-07-14 05:54:29,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-07-14 05:54:29,934 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) [2022-07-14 05:54:30,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:54:30,282 INFO L93 Difference]: Finished difference Result 197 states and 221 transitions. [2022-07-14 05:54:30,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-07-14 05:54:30,282 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 [2022-07-14 05:54:30,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:54:30,283 INFO L225 Difference]: With dead ends: 197 [2022-07-14 05:54:30,283 INFO L226 Difference]: Without dead ends: 197 [2022-07-14 05:54:30,283 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 [2022-07-14 05:54:30,284 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 [2022-07-14 05:54:30,284 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] [2022-07-14 05:54:30,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2022-07-14 05:54:30,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 195. [2022-07-14 05:54:30,290 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) [2022-07-14 05:54:30,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 221 transitions. [2022-07-14 05:54:30,291 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 221 transitions. Word has length 11 [2022-07-14 05:54:30,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:54:30,291 INFO L495 AbstractCegarLoop]: Abstraction has 195 states and 221 transitions. [2022-07-14 05:54:30,291 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) [2022-07-14 05:54:30,292 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 221 transitions. [2022-07-14 05:54:30,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-07-14 05:54:30,292 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:54:30,292 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-14 05:54:30,301 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2022-07-14 05:54:30,502 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-14 05:54:30,502 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)] === [2022-07-14 05:54:30,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:54:30,503 INFO L85 PathProgramCache]: Analyzing trace with hash -916126342, now seen corresponding path program 1 times [2022-07-14 05:54:30,503 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:54:30,503 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1385352344] [2022-07-14 05:54:30,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:54:30,504 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:54:30,504 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:54:30,505 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) [2022-07-14 05:54:30,507 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2022-07-14 05:54:30,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:54:30,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 6 conjunts are in the unsatisfiable core [2022-07-14 05:54:30,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:54:30,557 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 [2022-07-14 05:54:30,616 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-14 05:54:30,616 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-14 05:54:30,616 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:54:30,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1385352344] [2022-07-14 05:54:30,617 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1385352344] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-14 05:54:30,618 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-14 05:54:30,618 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-14 05:54:30,619 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750205100] [2022-07-14 05:54:30,619 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-14 05:54:30,619 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-07-14 05:54:30,619 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:54:30,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-07-14 05:54:30,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-07-14 05:54:30,620 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) [2022-07-14 05:54:30,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:54:30,991 INFO L93 Difference]: Finished difference Result 201 states and 231 transitions. [2022-07-14 05:54:30,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-07-14 05:54:30,992 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 [2022-07-14 05:54:30,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:54:30,993 INFO L225 Difference]: With dead ends: 201 [2022-07-14 05:54:30,993 INFO L226 Difference]: Without dead ends: 201 [2022-07-14 05:54:30,993 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 [2022-07-14 05:54:30,994 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 [2022-07-14 05:54:30,994 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] [2022-07-14 05:54:30,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2022-07-14 05:54:30,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 198. [2022-07-14 05:54:30,998 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) [2022-07-14 05:54:30,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 225 transitions. [2022-07-14 05:54:30,999 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 225 transitions. Word has length 11 [2022-07-14 05:54:30,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:54:30,999 INFO L495 AbstractCegarLoop]: Abstraction has 198 states and 225 transitions. [2022-07-14 05:54:30,999 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) [2022-07-14 05:54:30,999 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 225 transitions. [2022-07-14 05:54:30,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-07-14 05:54:31,000 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:54:31,000 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-14 05:54:31,008 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Ended with exit code 0 [2022-07-14 05:54:31,200 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-14 05:54:31,201 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting sizeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-14 05:54:31,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:54:31,201 INFO L85 PathProgramCache]: Analyzing trace with hash -1497511222, now seen corresponding path program 1 times [2022-07-14 05:54:31,202 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:54:31,202 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [189820600] [2022-07-14 05:54:31,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:54:31,202 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:54:31,202 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:54:31,203 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) [2022-07-14 05:54:31,205 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2022-07-14 05:54:31,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:54:31,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 13 conjunts are in the unsatisfiable core [2022-07-14 05:54:31,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:54:31,334 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-14 05:54:31,334 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-14 05:54:31,334 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:54:31,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [189820600] [2022-07-14 05:54:31,335 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [189820600] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-14 05:54:31,335 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-14 05:54:31,335 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-07-14 05:54:31,335 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [824932543] [2022-07-14 05:54:31,335 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-14 05:54:31,335 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-07-14 05:54:31,336 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:54:31,336 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-07-14 05:54:31,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-07-14 05:54:31,336 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) [2022-07-14 05:54:31,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:54:31,444 INFO L93 Difference]: Finished difference Result 306 states and 347 transitions. [2022-07-14 05:54:31,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-14 05:54:31,445 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 [2022-07-14 05:54:31,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:54:31,446 INFO L225 Difference]: With dead ends: 306 [2022-07-14 05:54:31,446 INFO L226 Difference]: Without dead ends: 306 [2022-07-14 05:54:31,446 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 [2022-07-14 05:54:31,447 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 [2022-07-14 05:54:31,447 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] [2022-07-14 05:54:31,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2022-07-14 05:54:31,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 244. [2022-07-14 05:54:31,452 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) [2022-07-14 05:54:31,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 306 transitions. [2022-07-14 05:54:31,453 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 306 transitions. Word has length 17 [2022-07-14 05:54:31,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:54:31,454 INFO L495 AbstractCegarLoop]: Abstraction has 244 states and 306 transitions. [2022-07-14 05:54:31,454 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) [2022-07-14 05:54:31,454 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 306 transitions. [2022-07-14 05:54:31,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-07-14 05:54:31,455 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:54:31,455 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-14 05:54:31,461 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2022-07-14 05:54:31,661 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-14 05:54:31,662 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)] === [2022-07-14 05:54:31,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:54:31,662 INFO L85 PathProgramCache]: Analyzing trace with hash -2030552348, now seen corresponding path program 1 times [2022-07-14 05:54:31,662 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:54:31,663 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1203673878] [2022-07-14 05:54:31,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:54:31,663 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:54:31,663 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:54:31,664 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) [2022-07-14 05:54:31,666 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2022-07-14 05:54:31,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:54:31,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 11 conjunts are in the unsatisfiable core [2022-07-14 05:54:31,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:54:31,798 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 [2022-07-14 05:54:31,959 INFO L356 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-07-14 05:54:31,959 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 [2022-07-14 05:54:31,967 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-07-14 05:54:31,967 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:54:32,083 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:54:32,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1203673878] [2022-07-14 05:54:32,083 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1203673878] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:54:32,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1778400363] [2022-07-14 05:54:32,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:54:32,084 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-14 05:54:32,084 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-14 05:54:32,086 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) [2022-07-14 05:54:32,107 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2022-07-14 05:54:32,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:54:32,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 12 conjunts are in the unsatisfiable core [2022-07-14 05:54:32,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:54:32,259 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 [2022-07-14 05:54:34,365 INFO L356 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2022-07-14 05:54:34,365 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 [2022-07-14 05:54:34,374 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-07-14 05:54:34,375 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:54:34,459 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1778400363] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:54:34,459 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:54:34,459 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2022-07-14 05:54:34,459 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [193789671] [2022-07-14 05:54:34,459 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:54:34,460 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-07-14 05:54:34,460 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:54:34,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-07-14 05:54:34,460 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=27, Unknown=1, NotChecked=0, Total=42 [2022-07-14 05:54:34,460 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) [2022-07-14 05:54:40,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:54:40,859 INFO L93 Difference]: Finished difference Result 250 states and 314 transitions. [2022-07-14 05:54:40,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-14 05:54:40,860 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 [2022-07-14 05:54:40,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:54:40,861 INFO L225 Difference]: With dead ends: 250 [2022-07-14 05:54:40,861 INFO L226 Difference]: Without dead ends: 250 [2022-07-14 05:54:40,861 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 [2022-07-14 05:54:40,862 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 [2022-07-14 05:54:40,862 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] [2022-07-14 05:54:40,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2022-07-14 05:54:40,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 248. [2022-07-14 05:54:40,869 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) [2022-07-14 05:54:40,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 314 transitions. [2022-07-14 05:54:40,870 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 314 transitions. Word has length 29 [2022-07-14 05:54:40,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:54:40,870 INFO L495 AbstractCegarLoop]: Abstraction has 248 states and 314 transitions. [2022-07-14 05:54:40,871 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) [2022-07-14 05:54:40,871 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 314 transitions. [2022-07-14 05:54:40,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-07-14 05:54:40,872 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:54:40,872 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-07-14 05:54:40,888 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (9)] Forceful destruction successful, exit code 0 [2022-07-14 05:54:41,087 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2022-07-14 05:54:41,283 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 [2022-07-14 05:54:41,284 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)] === [2022-07-14 05:54:41,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:54:41,284 INFO L85 PathProgramCache]: Analyzing trace with hash 2020472179, now seen corresponding path program 1 times [2022-07-14 05:54:41,285 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:54:41,285 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1971342552] [2022-07-14 05:54:41,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:54:41,285 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:54:41,285 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:54:41,286 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) [2022-07-14 05:54:41,287 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2022-07-14 05:54:41,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:54:41,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 16 conjunts are in the unsatisfiable core [2022-07-14 05:54:41,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:54:41,499 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 [2022-07-14 05:54:41,503 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 [2022-07-14 05:54:49,696 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-14 05:54:49,698 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 [2022-07-14 05:54:49,705 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-14 05:54:49,705 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 [2022-07-14 05:54:49,723 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 25 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-07-14 05:54:49,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:54:51,987 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:54:51,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1971342552] [2022-07-14 05:54:51,988 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1971342552] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:54:51,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1019573070] [2022-07-14 05:54:51,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:54:51,988 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-14 05:54:51,988 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-14 05:54:51,989 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) [2022-07-14 05:54:51,991 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2022-07-14 05:54:52,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:54:52,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 16 conjunts are in the unsatisfiable core [2022-07-14 05:54:52,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:54:52,192 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 [2022-07-14 05:54:52,198 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 [2022-07-14 05:54:56,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-14 05:54:56,369 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 [2022-07-14 05:54:56,378 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-14 05:54:56,378 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 [2022-07-14 05:54:56,385 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 25 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-07-14 05:54:56,385 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:54:58,643 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1019573070] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:54:58,643 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:54:58,643 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2022-07-14 05:54:58,644 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064198824] [2022-07-14 05:54:58,644 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:54:58,644 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-07-14 05:54:58,644 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:54:58,645 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-07-14 05:54:58,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=49, Unknown=3, NotChecked=0, Total=72 [2022-07-14 05:54:58,645 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) [2022-07-14 05:54:59,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:54:59,141 INFO L93 Difference]: Finished difference Result 267 states and 346 transitions. [2022-07-14 05:54:59,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-07-14 05:54:59,141 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 [2022-07-14 05:54:59,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:54:59,143 INFO L225 Difference]: With dead ends: 267 [2022-07-14 05:54:59,143 INFO L226 Difference]: Without dead ends: 267 [2022-07-14 05:54:59,143 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 60 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 16.5s TimeCoverageRelationStatistics Valid=27, Invalid=60, Unknown=3, NotChecked=0, Total=90 [2022-07-14 05:54:59,144 INFO L413 NwaCegarLoop]: 180 mSDtfsCounter, 129 mSDsluCounter, 232 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 412 SdHoareTripleChecker+Invalid, 437 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 162 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-07-14 05:54:59,144 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [135 Valid, 412 Invalid, 437 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 220 Invalid, 0 Unknown, 162 Unchecked, 0.4s Time] [2022-07-14 05:54:59,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2022-07-14 05:54:59,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 264. [2022-07-14 05:54:59,151 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) [2022-07-14 05:54:59,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 337 transitions. [2022-07-14 05:54:59,153 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 337 transitions. Word has length 35 [2022-07-14 05:54:59,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:54:59,153 INFO L495 AbstractCegarLoop]: Abstraction has 264 states and 337 transitions. [2022-07-14 05:54:59,153 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) [2022-07-14 05:54:59,153 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 337 transitions. [2022-07-14 05:54:59,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-07-14 05:54:59,154 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:54:59,154 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] [2022-07-14 05:54:59,190 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2022-07-14 05:54:59,363 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Ended with exit code 0 [2022-07-14 05:54:59,555 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 [2022-07-14 05:54:59,556 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting minErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-14 05:54:59,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:54:59,556 INFO L85 PathProgramCache]: Analyzing trace with hash -599064084, now seen corresponding path program 1 times [2022-07-14 05:54:59,556 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:54:59,556 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1685230737] [2022-07-14 05:54:59,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:54:59,557 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:54:59,557 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:54:59,558 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) [2022-07-14 05:54:59,559 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2022-07-14 05:54:59,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:54:59,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 13 conjunts are in the unsatisfiable core [2022-07-14 05:54:59,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:54:59,649 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 [2022-07-14 05:54:59,732 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-07-14 05:54:59,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:54:59,887 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-07-14 05:54:59,887 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:54:59,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1685230737] [2022-07-14 05:54:59,887 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1685230737] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-14 05:54:59,887 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:54:59,887 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2022-07-14 05:54:59,887 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1004531864] [2022-07-14 05:54:59,887 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:54:59,888 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-14 05:54:59,888 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:54:59,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-14 05:54:59,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2022-07-14 05:54:59,888 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) [2022-07-14 05:55:01,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:55:01,195 INFO L93 Difference]: Finished difference Result 304 states and 361 transitions. [2022-07-14 05:55:01,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-07-14 05:55:01,196 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 [2022-07-14 05:55:01,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:55:01,197 INFO L225 Difference]: With dead ends: 304 [2022-07-14 05:55:01,197 INFO L226 Difference]: Without dead ends: 304 [2022-07-14 05:55:01,197 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 [2022-07-14 05:55:01,198 INFO L413 NwaCegarLoop]: 213 mSDtfsCounter, 217 mSDsluCounter, 750 mSDsCounter, 0 mSdLazyCounter, 1145 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s 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, 1.2s IncrementalHoareTripleChecker+Time [2022-07-14 05:55:01,198 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [221 Valid, 963 Invalid, 1292 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 1145 Invalid, 0 Unknown, 96 Unchecked, 1.2s Time] [2022-07-14 05:55:01,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2022-07-14 05:55:01,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 276. [2022-07-14 05:55:01,204 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) [2022-07-14 05:55:01,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 356 transitions. [2022-07-14 05:55:01,206 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 356 transitions. Word has length 25 [2022-07-14 05:55:01,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:55:01,206 INFO L495 AbstractCegarLoop]: Abstraction has 276 states and 356 transitions. [2022-07-14 05:55:01,206 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) [2022-07-14 05:55:01,206 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 356 transitions. [2022-07-14 05:55:01,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-07-14 05:55:01,207 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:55:01,207 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] [2022-07-14 05:55:01,217 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2022-07-14 05:55:01,425 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-14 05:55:01,426 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting minErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-14 05:55:01,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:55:01,426 INFO L85 PathProgramCache]: Analyzing trace with hash -599064083, now seen corresponding path program 1 times [2022-07-14 05:55:01,426 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:55:01,427 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [776199085] [2022-07-14 05:55:01,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:55:01,427 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:55:01,427 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:55:01,428 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) [2022-07-14 05:55:01,430 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2022-07-14 05:55:01,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:55:01,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 20 conjunts are in the unsatisfiable core [2022-07-14 05:55:01,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:55:01,527 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 [2022-07-14 05:55:01,657 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-07-14 05:55:01,657 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:55:02,410 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-07-14 05:55:02,411 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:55:02,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [776199085] [2022-07-14 05:55:02,411 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [776199085] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-14 05:55:02,411 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:55:02,411 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2022-07-14 05:55:02,411 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960739927] [2022-07-14 05:55:02,412 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:55:02,412 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-07-14 05:55:02,412 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:55:02,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-07-14 05:55:02,413 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2022-07-14 05:55:02,413 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) [2022-07-14 05:55:05,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:55:05,907 INFO L93 Difference]: Finished difference Result 301 states and 392 transitions. [2022-07-14 05:55:05,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-07-14 05:55:05,908 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 [2022-07-14 05:55:05,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:55:05,909 INFO L225 Difference]: With dead ends: 301 [2022-07-14 05:55:05,909 INFO L226 Difference]: Without dead ends: 301 [2022-07-14 05:55:05,910 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=74, Invalid=388, Unknown=0, NotChecked=0, Total=462 [2022-07-14 05:55:05,910 INFO L413 NwaCegarLoop]: 185 mSDtfsCounter, 126 mSDsluCounter, 923 mSDsCounter, 0 mSdLazyCounter, 1354 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s 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, 3.2s IncrementalHoareTripleChecker+Time [2022-07-14 05:55:05,910 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [130 Valid, 1108 Invalid, 1462 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 1354 Invalid, 0 Unknown, 64 Unchecked, 3.2s Time] [2022-07-14 05:55:05,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2022-07-14 05:55:05,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 292. [2022-07-14 05:55:05,917 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) [2022-07-14 05:55:05,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 377 transitions. [2022-07-14 05:55:05,918 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 377 transitions. Word has length 25 [2022-07-14 05:55:05,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:55:05,919 INFO L495 AbstractCegarLoop]: Abstraction has 292 states and 377 transitions. [2022-07-14 05:55:05,919 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) [2022-07-14 05:55:05,919 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 377 transitions. [2022-07-14 05:55:05,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-07-14 05:55:05,920 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:55:05,920 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] [2022-07-14 05:55:05,927 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2022-07-14 05:55:06,123 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-14 05:55:06,124 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)] === [2022-07-14 05:55:06,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:55:06,124 INFO L85 PathProgramCache]: Analyzing trace with hash -1805510171, now seen corresponding path program 1 times [2022-07-14 05:55:06,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:55:06,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1289615175] [2022-07-14 05:55:06,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:55:06,125 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:55:06,125 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:55:06,126 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) [2022-07-14 05:55:06,128 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2022-07-14 05:55:06,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:55:06,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 6 conjunts are in the unsatisfiable core [2022-07-14 05:55:06,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:55:06,235 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-14 05:55:06,236 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-14 05:55:06,236 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:55:06,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1289615175] [2022-07-14 05:55:06,236 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1289615175] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-14 05:55:06,236 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-14 05:55:06,236 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-07-14 05:55:06,236 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006391978] [2022-07-14 05:55:06,236 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-14 05:55:06,237 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-07-14 05:55:06,237 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:55:06,237 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-07-14 05:55:06,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-07-14 05:55:06,238 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) [2022-07-14 05:55:06,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:55:06,261 INFO L93 Difference]: Finished difference Result 258 states and 309 transitions. [2022-07-14 05:55:06,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-07-14 05:55:06,261 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 [2022-07-14 05:55:06,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:55:06,263 INFO L225 Difference]: With dead ends: 258 [2022-07-14 05:55:06,263 INFO L226 Difference]: Without dead ends: 242 [2022-07-14 05:55:06,264 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 [2022-07-14 05:55:06,264 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 [2022-07-14 05:55:06,264 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] [2022-07-14 05:55:06,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2022-07-14 05:55:06,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 242. [2022-07-14 05:55:06,277 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) [2022-07-14 05:55:06,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 293 transitions. [2022-07-14 05:55:06,280 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 293 transitions. Word has length 30 [2022-07-14 05:55:06,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:55:06,281 INFO L495 AbstractCegarLoop]: Abstraction has 242 states and 293 transitions. [2022-07-14 05:55:06,281 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) [2022-07-14 05:55:06,281 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 293 transitions. [2022-07-14 05:55:06,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-07-14 05:55:06,283 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:55:06,284 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] [2022-07-14 05:55:06,297 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2022-07-14 05:55:06,490 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-14 05:55:06,492 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting sizeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-14 05:55:06,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:55:06,492 INFO L85 PathProgramCache]: Analyzing trace with hash -1626172482, now seen corresponding path program 1 times [2022-07-14 05:55:06,492 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:55:06,493 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1771267234] [2022-07-14 05:55:06,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:55:06,493 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:55:06,493 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:55:06,494 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) [2022-07-14 05:55:06,497 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2022-07-14 05:55:06,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:55:06,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2022-07-14 05:55:06,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:55:06,641 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-07-14 05:55:06,641 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-14 05:55:06,641 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:55:06,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1771267234] [2022-07-14 05:55:06,641 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1771267234] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-14 05:55:06,641 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-14 05:55:06,641 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-07-14 05:55:06,642 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901310218] [2022-07-14 05:55:06,642 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-14 05:55:06,642 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-07-14 05:55:06,642 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:55:06,642 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-07-14 05:55:06,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-07-14 05:55:06,643 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) [2022-07-14 05:55:06,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:55:06,898 INFO L93 Difference]: Finished difference Result 248 states and 302 transitions. [2022-07-14 05:55:06,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-14 05:55:06,898 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 [2022-07-14 05:55:06,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:55:06,900 INFO L225 Difference]: With dead ends: 248 [2022-07-14 05:55:06,900 INFO L226 Difference]: Without dead ends: 244 [2022-07-14 05:55:06,900 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2022-07-14 05:55:06,900 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 [2022-07-14 05:55:06,901 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] [2022-07-14 05:55:06,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2022-07-14 05:55:06,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 242. [2022-07-14 05:55:06,905 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) [2022-07-14 05:55:06,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 291 transitions. [2022-07-14 05:55:06,907 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 291 transitions. Word has length 31 [2022-07-14 05:55:06,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:55:06,907 INFO L495 AbstractCegarLoop]: Abstraction has 242 states and 291 transitions. [2022-07-14 05:55:06,907 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) [2022-07-14 05:55:06,907 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 291 transitions. [2022-07-14 05:55:06,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-07-14 05:55:06,908 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:55:06,908 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] [2022-07-14 05:55:06,915 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2022-07-14 05:55:07,114 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-14 05:55:07,115 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting minErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-14 05:55:07,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:55:07,115 INFO L85 PathProgramCache]: Analyzing trace with hash -575590880, now seen corresponding path program 1 times [2022-07-14 05:55:07,115 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:55:07,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1637095159] [2022-07-14 05:55:07,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:55:07,116 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:55:07,116 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:55:07,120 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) [2022-07-14 05:55:07,121 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2022-07-14 05:55:07,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:55:07,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 37 conjunts are in the unsatisfiable core [2022-07-14 05:55:07,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:55:07,268 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 [2022-07-14 05:55:07,275 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 [2022-07-14 05:55:07,358 INFO L356 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2022-07-14 05:55:07,358 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 [2022-07-14 05:55:07,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-14 05:55:07,370 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 [2022-07-14 05:55:07,532 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 [2022-07-14 05:55:07,536 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 [2022-07-14 05:55:07,630 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-14 05:55:07,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:55:12,408 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-14 05:55:12,409 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:55:12,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1637095159] [2022-07-14 05:55:12,409 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1637095159] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-14 05:55:12,409 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:55:12,409 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2022-07-14 05:55:12,409 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418637339] [2022-07-14 05:55:12,409 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:55:12,409 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-07-14 05:55:12,409 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:55:12,410 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-07-14 05:55:12,410 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=180, Unknown=2, NotChecked=0, Total=210 [2022-07-14 05:55:12,410 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) [2022-07-14 05:55:13,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:55:13,275 INFO L93 Difference]: Finished difference Result 260 states and 315 transitions. [2022-07-14 05:55:13,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-07-14 05:55:13,276 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 [2022-07-14 05:55:13,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:55:13,280 INFO L225 Difference]: With dead ends: 260 [2022-07-14 05:55:13,280 INFO L226 Difference]: Without dead ends: 260 [2022-07-14 05:55:13,280 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=401, Unknown=2, NotChecked=0, Total=462 [2022-07-14 05:55:13,281 INFO L413 NwaCegarLoop]: 207 mSDtfsCounter, 44 mSDsluCounter, 2181 mSDsCounter, 0 mSdLazyCounter, 381 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s 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, 0.7s IncrementalHoareTripleChecker+Time [2022-07-14 05:55:13,281 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 2388 Invalid, 485 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 381 Invalid, 0 Unknown, 90 Unchecked, 0.7s Time] [2022-07-14 05:55:13,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2022-07-14 05:55:13,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 249. [2022-07-14 05:55:13,288 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) [2022-07-14 05:55:13,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 297 transitions. [2022-07-14 05:55:13,289 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 297 transitions. Word has length 31 [2022-07-14 05:55:13,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:55:13,290 INFO L495 AbstractCegarLoop]: Abstraction has 249 states and 297 transitions. [2022-07-14 05:55:13,290 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) [2022-07-14 05:55:13,290 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 297 transitions. [2022-07-14 05:55:13,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-07-14 05:55:13,291 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:55:13,291 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2022-07-14 05:55:13,305 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2022-07-14 05:55:13,499 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-14 05:55:13,500 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)] === [2022-07-14 05:55:13,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:55:13,500 INFO L85 PathProgramCache]: Analyzing trace with hash 698832763, now seen corresponding path program 1 times [2022-07-14 05:55:13,500 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:55:13,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1471939127] [2022-07-14 05:55:13,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:55:13,501 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:55:13,501 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:55:13,502 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) [2022-07-14 05:55:13,503 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2022-07-14 05:55:13,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:55:13,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 20 conjunts are in the unsatisfiable core [2022-07-14 05:55:13,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:55:13,752 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 [2022-07-14 05:55:13,761 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 [2022-07-14 05:55:19,970 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-14 05:55:19,971 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-07-14 05:55:19,981 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-14 05:55:19,981 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 [2022-07-14 05:55:20,004 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 42 proven. 21 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-07-14 05:55:20,004 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:55:22,520 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:55:22,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1471939127] [2022-07-14 05:55:22,520 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1471939127] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:55:22,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [270763889] [2022-07-14 05:55:22,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:55:22,521 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-14 05:55:22,521 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-14 05:55:22,522 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) [2022-07-14 05:55:22,523 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2022-07-14 05:55:22,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:55:22,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 20 conjunts are in the unsatisfiable core [2022-07-14 05:55:22,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:55:22,785 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 [2022-07-14 05:55:22,791 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 [2022-07-14 05:55:26,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-14 05:55:26,975 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 [2022-07-14 05:55:26,982 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-14 05:55:26,982 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 [2022-07-14 05:55:26,988 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 42 proven. 21 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-07-14 05:55:26,988 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:55:29,312 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [270763889] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:55:29,312 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:55:29,312 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2022-07-14 05:55:29,312 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1234344630] [2022-07-14 05:55:29,312 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:55:29,313 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-07-14 05:55:29,313 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:55:29,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-07-14 05:55:29,313 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=50, Unknown=2, NotChecked=0, Total=72 [2022-07-14 05:55:29,313 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) [2022-07-14 05:55:29,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:55:29,857 INFO L93 Difference]: Finished difference Result 254 states and 308 transitions. [2022-07-14 05:55:29,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-07-14 05:55:29,857 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 [2022-07-14 05:55:29,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:55:29,858 INFO L225 Difference]: With dead ends: 254 [2022-07-14 05:55:29,858 INFO L226 Difference]: Without dead ends: 254 [2022-07-14 05:55:29,858 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 80 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 14.8s TimeCoverageRelationStatistics Valid=27, Invalid=61, Unknown=2, NotChecked=0, Total=90 [2022-07-14 05:55:29,859 INFO L413 NwaCegarLoop]: 174 mSDtfsCounter, 115 mSDsluCounter, 290 mSDsCounter, 0 mSdLazyCounter, 342 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 464 SdHoareTripleChecker+Invalid, 545 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 342 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 157 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-07-14 05:55:29,859 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [121 Valid, 464 Invalid, 545 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 342 Invalid, 0 Unknown, 157 Unchecked, 0.5s Time] [2022-07-14 05:55:29,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2022-07-14 05:55:29,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 250. [2022-07-14 05:55:29,863 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) [2022-07-14 05:55:29,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 299 transitions. [2022-07-14 05:55:29,864 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 299 transitions. Word has length 45 [2022-07-14 05:55:29,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:55:29,865 INFO L495 AbstractCegarLoop]: Abstraction has 250 states and 299 transitions. [2022-07-14 05:55:29,865 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) [2022-07-14 05:55:29,865 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 299 transitions. [2022-07-14 05:55:29,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-07-14 05:55:29,865 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:55:29,866 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-07-14 05:55:29,875 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2022-07-14 05:55:30,077 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Forceful destruction successful, exit code 0 [2022-07-14 05:55:30,273 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 [2022-07-14 05:55:30,273 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)] === [2022-07-14 05:55:30,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:55:30,274 INFO L85 PathProgramCache]: Analyzing trace with hash 324404478, now seen corresponding path program 1 times [2022-07-14 05:55:30,274 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:55:30,274 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1089740739] [2022-07-14 05:55:30,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:55:30,274 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:55:30,275 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:55:30,276 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) [2022-07-14 05:55:30,277 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2022-07-14 05:55:30,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:55:30,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 13 conjunts are in the unsatisfiable core [2022-07-14 05:55:30,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:55:30,437 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 [2022-07-14 05:55:30,563 INFO L356 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-07-14 05:55:30,563 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 [2022-07-14 05:55:30,568 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-07-14 05:55:30,568 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:55:30,661 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:55:30,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1089740739] [2022-07-14 05:55:30,662 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1089740739] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:55:30,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1368564158] [2022-07-14 05:55:30,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:55:30,662 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-14 05:55:30,662 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-14 05:55:30,674 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) [2022-07-14 05:55:30,675 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2022-07-14 05:55:30,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:55:30,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 14 conjunts are in the unsatisfiable core [2022-07-14 05:55:30,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:55:30,845 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 [2022-07-14 05:55:32,916 INFO L356 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2022-07-14 05:55:32,917 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 [2022-07-14 05:55:32,922 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-07-14 05:55:32,923 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:55:33,028 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1368564158] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:55:33,028 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:55:33,028 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2022-07-14 05:55:33,030 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508603017] [2022-07-14 05:55:33,030 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:55:33,030 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-07-14 05:55:33,030 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:55:33,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-07-14 05:55:33,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=27, Unknown=1, NotChecked=0, Total=42 [2022-07-14 05:55:33,031 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) [2022-07-14 05:55:37,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:55:37,399 INFO L93 Difference]: Finished difference Result 253 states and 307 transitions. [2022-07-14 05:55:37,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-14 05:55:37,400 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 [2022-07-14 05:55:37,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:55:37,401 INFO L225 Difference]: With dead ends: 253 [2022-07-14 05:55:37,401 INFO L226 Difference]: Without dead ends: 253 [2022-07-14 05:55:37,401 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 [2022-07-14 05:55:37,402 INFO L413 NwaCegarLoop]: 184 mSDtfsCounter, 58 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s 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 [2022-07-14 05:55:37,402 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] [2022-07-14 05:55:37,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2022-07-14 05:55:37,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 249. [2022-07-14 05:55:37,406 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) [2022-07-14 05:55:37,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 297 transitions. [2022-07-14 05:55:37,407 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 297 transitions. Word has length 31 [2022-07-14 05:55:37,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:55:37,408 INFO L495 AbstractCegarLoop]: Abstraction has 249 states and 297 transitions. [2022-07-14 05:55:37,408 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) [2022-07-14 05:55:37,408 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 297 transitions. [2022-07-14 05:55:37,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-07-14 05:55:37,408 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:55:37,408 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1] [2022-07-14 05:55:37,416 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (20)] Forceful destruction successful, exit code 0 [2022-07-14 05:55:37,618 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Ended with exit code 0 [2022-07-14 05:55:37,811 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 [2022-07-14 05:55:37,811 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)] === [2022-07-14 05:55:37,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:55:37,812 INFO L85 PathProgramCache]: Analyzing trace with hash -1380718298, now seen corresponding path program 2 times [2022-07-14 05:55:37,812 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:55:37,812 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [604170541] [2022-07-14 05:55:37,812 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-14 05:55:37,812 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:55:37,812 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:55:37,813 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) [2022-07-14 05:55:37,815 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2022-07-14 05:55:38,008 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-14 05:55:38,008 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-14 05:55:38,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 17 conjunts are in the unsatisfiable core [2022-07-14 05:55:38,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:55:38,022 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 [2022-07-14 05:55:42,223 INFO L356 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2022-07-14 05:55:42,223 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 [2022-07-14 05:55:42,305 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 41 proven. 27 refuted. 3 times theorem prover too weak. 19 trivial. 0 not checked. [2022-07-14 05:55:42,306 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:55:44,616 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:55:44,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [604170541] [2022-07-14 05:55:44,617 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [604170541] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:55:44,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [651580927] [2022-07-14 05:55:44,617 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-14 05:55:44,617 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-14 05:55:44,617 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-14 05:55:44,618 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) [2022-07-14 05:55:44,622 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2022-07-14 05:55:44,822 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (22)] Ended with exit code 1 [2022-07-14 05:55:44,824 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-14 05:55:44,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [560107255] [2022-07-14 05:55:44,824 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-14 05:55:44,824 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-14 05:55:44,824 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-14 05:55:44,825 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) [2022-07-14 05:55:44,835 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-07-14 05:55:44,977 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-14 05:55:44,977 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-14 05:55:44,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 17 conjunts are in the unsatisfiable core [2022-07-14 05:55:44,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:55:44,986 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 [2022-07-14 05:55:55,285 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-14 05:55:55,303 INFO L356 Elim1Store]: treesize reduction 24, result has 46.7 percent of original size [2022-07-14 05:55:55,303 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 [2022-07-14 05:55:55,325 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 41 proven. 27 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-07-14 05:55:55,326 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:55:55,513 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [560107255] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:55:55,513 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:55:55,513 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2022-07-14 05:55:55,513 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521646636] [2022-07-14 05:55:55,513 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:55:55,514 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-14 05:55:55,514 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:55:55,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-14 05:55:55,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=95, Unknown=6, NotChecked=0, Total=132 [2022-07-14 05:55:55,514 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) [2022-07-14 05:56:15,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:56:15,986 INFO L93 Difference]: Finished difference Result 287 states and 354 transitions. [2022-07-14 05:56:15,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-07-14 05:56:15,987 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 [2022-07-14 05:56:15,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:56:15,988 INFO L225 Difference]: With dead ends: 287 [2022-07-14 05:56:15,988 INFO L226 Difference]: Without dead ends: 287 [2022-07-14 05:56:15,988 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 92 SyntacticMatches, 6 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 36.8s TimeCoverageRelationStatistics Valid=76, Invalid=183, Unknown=13, NotChecked=0, Total=272 [2022-07-14 05:56:15,989 INFO L413 NwaCegarLoop]: 214 mSDtfsCounter, 10 mSDsluCounter, 527 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 741 SdHoareTripleChecker+Invalid, 657 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 582 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-14 05:56:15,989 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 741 Invalid, 657 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 72 Invalid, 0 Unknown, 582 Unchecked, 0.2s Time] [2022-07-14 05:56:15,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2022-07-14 05:56:15,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 286. [2022-07-14 05:56:15,993 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) [2022-07-14 05:56:15,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 354 transitions. [2022-07-14 05:56:15,994 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 354 transitions. Word has length 49 [2022-07-14 05:56:15,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:56:15,995 INFO L495 AbstractCegarLoop]: Abstraction has 286 states and 354 transitions. [2022-07-14 05:56:15,995 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) [2022-07-14 05:56:15,995 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 354 transitions. [2022-07-14 05:56:15,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-07-14 05:56:15,996 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:56:15,996 INFO L195 NwaCegarLoop]: trace histogram [7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 1, 1, 1, 1] [2022-07-14 05:56:16,010 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2022-07-14 05:56:16,228 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-07-14 05:56:16,410 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 [2022-07-14 05:56:16,410 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)] === [2022-07-14 05:56:16,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:56:16,411 INFO L85 PathProgramCache]: Analyzing trace with hash -1701152456, now seen corresponding path program 2 times [2022-07-14 05:56:16,411 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:56:16,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [509259320] [2022-07-14 05:56:16,411 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-14 05:56:16,411 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:56:16,411 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:56:16,412 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) [2022-07-14 05:56:16,413 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2022-07-14 05:56:16,659 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-14 05:56:16,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-14 05:56:16,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 26 conjunts are in the unsatisfiable core [2022-07-14 05:56:16,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:56:16,677 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 [2022-07-14 05:56:16,683 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 [2022-07-14 05:56:24,961 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-14 05:56:24,995 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-07-14 05:56:24,996 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 [2022-07-14 05:56:25,008 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-14 05:56:25,008 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 [2022-07-14 05:56:25,054 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 48 proven. 54 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-07-14 05:56:25,054 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:56:27,251 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1208 (_ BitVec 32)) (v_nondet_tree_~n~0.base_87 (_ BitVec 32)) (v_nondet_tree_~n~0.base_86 (_ BitVec 32))) (or (let ((.cse0 (bvadd (_ bv12 32) c_nondet_tree_~n~0.offset))) (and (bvule (bvadd (_ bv8 32) c_nondet_tree_~n~0.offset) .cse0) (bvule .cse0 (select (store (store |c_#length| v_nondet_tree_~n~0.base_86 v_ArrVal_1208) v_nondet_tree_~n~0.base_87 (_ bv12 32)) c_nondet_tree_~n~0.base)))) (not (= (_ bv0 1) (bvneg (select |c_#valid| v_nondet_tree_~n~0.base_86)))))) is different from false [2022-07-14 05:56:27,255 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:56:27,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [509259320] [2022-07-14 05:56:27,256 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [509259320] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:56:27,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1492675774] [2022-07-14 05:56:27,256 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-14 05:56:27,256 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-14 05:56:27,256 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-14 05:56:27,257 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) [2022-07-14 05:56:27,257 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2022-07-14 05:56:27,521 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-14 05:56:27,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-14 05:56:27,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 26 conjunts are in the unsatisfiable core [2022-07-14 05:56:27,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:56:27,555 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 [2022-07-14 05:56:27,560 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 [2022-07-14 05:56:31,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-14 05:56:31,805 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-07-14 05:56:31,806 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 [2022-07-14 05:56:31,815 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-14 05:56:31,815 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 [2022-07-14 05:56:31,845 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 48 proven. 54 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-07-14 05:56:31,845 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:56:44,030 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1492675774] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:56:44,031 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:56:44,031 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2022-07-14 05:56:44,031 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885127202] [2022-07-14 05:56:44,031 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:56:44,031 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-07-14 05:56:44,031 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:56:44,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-07-14 05:56:44,032 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=79, Unknown=9, NotChecked=18, Total=132 [2022-07-14 05:56:44,032 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) [2022-07-14 05:56:46,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:56:46,515 INFO L93 Difference]: Finished difference Result 292 states and 371 transitions. [2022-07-14 05:56:46,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-07-14 05:56:46,516 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 [2022-07-14 05:56:46,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:56:46,517 INFO L225 Difference]: With dead ends: 292 [2022-07-14 05:56:46,517 INFO L226 Difference]: Without dead ends: 292 [2022-07-14 05:56:46,517 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 98 SyntacticMatches, 5 SemanticMatches, 11 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 28.4s TimeCoverageRelationStatistics Valid=34, Invalid=92, Unknown=10, NotChecked=20, Total=156 [2022-07-14 05:56:46,518 INFO L413 NwaCegarLoop]: 175 mSDtfsCounter, 58 mSDsluCounter, 431 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 606 SdHoareTripleChecker+Invalid, 706 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 422 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-07-14 05:56:46,518 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [64 Valid, 606 Invalid, 706 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 264 Invalid, 0 Unknown, 422 Unchecked, 0.4s Time] [2022-07-14 05:56:46,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2022-07-14 05:56:46,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 291. [2022-07-14 05:56:46,523 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) [2022-07-14 05:56:46,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 371 transitions. [2022-07-14 05:56:46,524 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 371 transitions. Word has length 55 [2022-07-14 05:56:46,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:56:46,525 INFO L495 AbstractCegarLoop]: Abstraction has 291 states and 371 transitions. [2022-07-14 05:56:46,525 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) [2022-07-14 05:56:46,525 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 371 transitions. [2022-07-14 05:56:46,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-07-14 05:56:46,525 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:56:46,526 INFO L195 NwaCegarLoop]: trace histogram [7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 1, 1, 1, 1] [2022-07-14 05:56:46,532 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2022-07-14 05:56:46,745 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2022-07-14 05:56:46,932 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 [2022-07-14 05:56:46,932 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)] === [2022-07-14 05:56:46,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:56:46,933 INFO L85 PathProgramCache]: Analyzing trace with hash -1701152457, now seen corresponding path program 2 times [2022-07-14 05:56:46,933 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:56:46,933 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1159963245] [2022-07-14 05:56:46,933 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-14 05:56:46,933 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:56:46,933 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:56:46,934 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) [2022-07-14 05:56:46,935 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2022-07-14 05:56:47,179 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-14 05:56:47,180 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-14 05:56:47,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 19 conjunts are in the unsatisfiable core [2022-07-14 05:56:47,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:56:47,197 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 [2022-07-14 05:56:51,399 INFO L356 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2022-07-14 05:56:51,400 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 [2022-07-14 05:56:51,462 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 48 proven. 34 refuted. 6 times theorem prover too weak. 30 trivial. 0 not checked. [2022-07-14 05:56:51,462 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:56:53,579 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:56:53,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1159963245] [2022-07-14 05:56:53,585 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1159963245] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:56:53,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2056066454] [2022-07-14 05:56:53,585 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-14 05:56:53,585 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-14 05:56:53,586 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-14 05:56:53,594 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) [2022-07-14 05:56:53,595 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2022-07-14 05:56:53,847 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-14 05:56:53,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2085175474] [2022-07-14 05:56:53,848 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-14 05:56:53,848 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-14 05:56:53,848 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-14 05:56:53,850 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) [2022-07-14 05:56:53,855 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (27)] Forceful destruction successful, exit code 1 [2022-07-14 05:56:53,858 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-07-14 05:56:54,031 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-14 05:56:54,031 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-14 05:56:54,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 16 conjunts are in the unsatisfiable core [2022-07-14 05:56:54,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:57:00,386 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-14 05:57:00,411 INFO L356 Elim1Store]: treesize reduction 24, result has 46.7 percent of original size [2022-07-14 05:57:00,411 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 [2022-07-14 05:57:00,424 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 62 proven. 24 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-07-14 05:57:00,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:57:00,764 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2085175474] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:57:00,764 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:57:00,764 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2022-07-14 05:57:00,764 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777538329] [2022-07-14 05:57:00,764 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:57:00,765 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-14 05:57:00,765 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:57:00,765 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-14 05:57:00,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=125, Unknown=5, NotChecked=0, Total=182 [2022-07-14 05:57:00,765 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) [2022-07-14 05:57:17,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:57:17,151 INFO L93 Difference]: Finished difference Result 310 states and 396 transitions. [2022-07-14 05:57:17,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-14 05:57:17,151 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 [2022-07-14 05:57:17,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:57:17,152 INFO L225 Difference]: With dead ends: 310 [2022-07-14 05:57:17,152 INFO L226 Difference]: Without dead ends: 308 [2022-07-14 05:57:17,152 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 101 SyntacticMatches, 6 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 28.7s TimeCoverageRelationStatistics Valid=101, Invalid=197, Unknown=8, NotChecked=0, Total=306 [2022-07-14 05:57:17,153 INFO L413 NwaCegarLoop]: 209 mSDtfsCounter, 16 mSDsluCounter, 522 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 731 SdHoareTripleChecker+Invalid, 786 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 712 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-14 05:57:17,153 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 731 Invalid, 786 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 72 Invalid, 0 Unknown, 712 Unchecked, 0.2s Time] [2022-07-14 05:57:17,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2022-07-14 05:57:17,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 305. [2022-07-14 05:57:17,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 305 states, 185 states have (on average 1.4432432432432432) internal successors, (267), 246 states have internal predecessors, (267), 36 states have call successors, (36), 15 states have call predecessors, (36), 24 states have return successors, (88), 43 states have call predecessors, (88), 36 states have call successors, (88) [2022-07-14 05:57:17,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 391 transitions. [2022-07-14 05:57:17,159 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 391 transitions. Word has length 55 [2022-07-14 05:57:17,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:57:17,159 INFO L495 AbstractCegarLoop]: Abstraction has 305 states and 391 transitions. [2022-07-14 05:57:17,159 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) [2022-07-14 05:57:17,160 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 391 transitions. [2022-07-14 05:57:17,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-07-14 05:57:17,160 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:57:17,160 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2022-07-14 05:57:17,181 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-07-14 05:57:17,384 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2022-07-14 05:57:17,575 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 [2022-07-14 05:57:17,575 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting nondet_treeErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-14 05:57:17,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:57:17,576 INFO L85 PathProgramCache]: Analyzing trace with hash 499009296, now seen corresponding path program 2 times [2022-07-14 05:57:17,576 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:57:17,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1544261744] [2022-07-14 05:57:17,576 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-14 05:57:17,576 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:57:17,576 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:57:17,577 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) [2022-07-14 05:57:17,578 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2022-07-14 05:57:17,831 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-14 05:57:17,831 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-14 05:57:17,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 22 conjunts are in the unsatisfiable core [2022-07-14 05:57:17,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:57:17,852 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 [2022-07-14 05:57:17,856 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 [2022-07-14 05:57:24,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-14 05:57:24,141 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-07-14 05:57:24,141 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 [2022-07-14 05:57:24,154 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-14 05:57:24,155 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 [2022-07-14 05:57:24,204 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 33 proven. 34 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-07-14 05:57:24,204 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:57:35,489 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:57:35,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1544261744] [2022-07-14 05:57:35,489 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1544261744] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:57:35,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1661482124] [2022-07-14 05:57:35,489 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-14 05:57:35,489 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-14 05:57:35,490 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-14 05:57:35,490 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) [2022-07-14 05:57:35,491 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2022-07-14 05:57:35,794 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-14 05:57:35,794 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-14 05:57:35,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 22 conjunts are in the unsatisfiable core [2022-07-14 05:57:35,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:57:35,814 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 [2022-07-14 05:57:35,825 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 [2022-07-14 05:57:38,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-14 05:57:38,060 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-07-14 05:57:38,061 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 [2022-07-14 05:57:38,072 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-14 05:57:38,072 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 [2022-07-14 05:57:38,116 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 33 proven. 34 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-07-14 05:57:38,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:57:40,276 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_nondet_tree_~n~0.base_144 (_ BitVec 32)) (v_ArrVal_1887 (_ BitVec 32)) (v_nondet_tree_~n~0.base_145 (_ BitVec 32))) (or (let ((.cse0 (bvadd (_ bv8 32) c_nondet_tree_~n~0.offset))) (and (bvule .cse0 (select (store (store |c_#length| v_nondet_tree_~n~0.base_144 v_ArrVal_1887) v_nondet_tree_~n~0.base_145 (_ bv12 32)) c_nondet_tree_~n~0.base)) (bvule (bvadd (_ bv4 32) c_nondet_tree_~n~0.offset) .cse0))) (not (= (bvneg (select |c_#valid| v_nondet_tree_~n~0.base_144)) (_ bv0 1))))) is different from false [2022-07-14 05:57:40,280 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1661482124] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:57:40,280 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:57:40,280 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2022-07-14 05:57:40,281 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691858003] [2022-07-14 05:57:40,281 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:57:40,281 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-07-14 05:57:40,281 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:57:40,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-07-14 05:57:40,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=80, Unknown=8, NotChecked=18, Total=132 [2022-07-14 05:57:40,282 INFO L87 Difference]: Start difference. First operand 305 states and 391 transitions. Second operand has 9 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 5 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2022-07-14 05:57:44,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:57:44,871 INFO L93 Difference]: Finished difference Result 331 states and 436 transitions. [2022-07-14 05:57:44,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-14 05:57:44,872 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 5 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 47 [2022-07-14 05:57:44,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:57:44,873 INFO L225 Difference]: With dead ends: 331 [2022-07-14 05:57:44,873 INFO L226 Difference]: Without dead ends: 331 [2022-07-14 05:57:44,874 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 85 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 25.5s TimeCoverageRelationStatistics Valid=42, Invalid=108, Unknown=10, NotChecked=22, Total=182 [2022-07-14 05:57:44,874 INFO L413 NwaCegarLoop]: 177 mSDtfsCounter, 59 mSDsluCounter, 445 mSDsCounter, 0 mSdLazyCounter, 261 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 622 SdHoareTripleChecker+Invalid, 721 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 261 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 439 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-07-14 05:57:44,874 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 622 Invalid, 721 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 261 Invalid, 0 Unknown, 439 Unchecked, 0.5s Time] [2022-07-14 05:57:44,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2022-07-14 05:57:44,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 331. [2022-07-14 05:57:44,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 331 states, 203 states have (on average 1.4088669950738917) internal successors, (286), 266 states have internal predecessors, (286), 40 states have call successors, (40), 17 states have call predecessors, (40), 28 states have return successors, (110), 47 states have call predecessors, (110), 40 states have call successors, (110) [2022-07-14 05:57:44,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 331 states to 331 states and 436 transitions. [2022-07-14 05:57:44,883 INFO L78 Accepts]: Start accepts. Automaton has 331 states and 436 transitions. Word has length 47 [2022-07-14 05:57:44,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:57:44,883 INFO L495 AbstractCegarLoop]: Abstraction has 331 states and 436 transitions. [2022-07-14 05:57:44,883 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 5 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2022-07-14 05:57:44,884 INFO L276 IsEmpty]: Start isEmpty. Operand 331 states and 436 transitions. [2022-07-14 05:57:44,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-07-14 05:57:44,884 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:57:44,884 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-14 05:57:44,903 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2022-07-14 05:57:45,097 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2022-07-14 05:57:45,289 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 [2022-07-14 05:57:45,289 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting minErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-14 05:57:45,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:57:45,289 INFO L85 PathProgramCache]: Analyzing trace with hash 1971504767, now seen corresponding path program 1 times [2022-07-14 05:57:45,289 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:57:45,289 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [73526738] [2022-07-14 05:57:45,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:57:45,290 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:57:45,290 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:57:45,291 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) [2022-07-14 05:57:45,292 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2022-07-14 05:57:45,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:57:45,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 29 conjunts are in the unsatisfiable core [2022-07-14 05:57:45,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:57:45,446 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 [2022-07-14 05:57:45,451 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 [2022-07-14 05:57:45,736 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 [2022-07-14 05:57:45,740 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 [2022-07-14 05:57:45,831 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-07-14 05:57:45,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:57:46,128 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-07-14 05:57:46,129 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:57:46,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [73526738] [2022-07-14 05:57:46,129 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [73526738] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-14 05:57:46,129 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:57:46,129 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 14 [2022-07-14 05:57:46,129 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983190979] [2022-07-14 05:57:46,129 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:57:46,129 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-07-14 05:57:46,129 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:57:46,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-07-14 05:57:46,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2022-07-14 05:57:46,130 INFO L87 Difference]: Start difference. First operand 331 states and 436 transitions. Second operand has 14 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 10 states have internal predecessors, (31), 4 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2022-07-14 05:57:46,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:57:46,747 INFO L93 Difference]: Finished difference Result 388 states and 523 transitions. [2022-07-14 05:57:46,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-07-14 05:57:46,747 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 10 states have internal predecessors, (31), 4 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) Word has length 38 [2022-07-14 05:57:46,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:57:46,749 INFO L225 Difference]: With dead ends: 388 [2022-07-14 05:57:46,749 INFO L226 Difference]: Without dead ends: 388 [2022-07-14 05:57:46,749 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2022-07-14 05:57:46,749 INFO L413 NwaCegarLoop]: 208 mSDtfsCounter, 58 mSDsluCounter, 1940 mSDsCounter, 0 mSdLazyCounter, 302 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 2148 SdHoareTripleChecker+Invalid, 371 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 302 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 60 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-07-14 05:57:46,750 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 2148 Invalid, 371 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 302 Invalid, 0 Unknown, 60 Unchecked, 0.5s Time] [2022-07-14 05:57:46,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 388 states. [2022-07-14 05:57:46,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 388 to 370. [2022-07-14 05:57:46,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 370 states, 233 states have (on average 1.4120171673819744) internal successors, (329), 295 states have internal predecessors, (329), 45 states have call successors, (45), 20 states have call predecessors, (45), 32 states have return successors, (133), 54 states have call predecessors, (133), 45 states have call successors, (133) [2022-07-14 05:57:46,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 370 states to 370 states and 507 transitions. [2022-07-14 05:57:46,758 INFO L78 Accepts]: Start accepts. Automaton has 370 states and 507 transitions. Word has length 38 [2022-07-14 05:57:46,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:57:46,758 INFO L495 AbstractCegarLoop]: Abstraction has 370 states and 507 transitions. [2022-07-14 05:57:46,758 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 10 states have internal predecessors, (31), 4 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2022-07-14 05:57:46,758 INFO L276 IsEmpty]: Start isEmpty. Operand 370 states and 507 transitions. [2022-07-14 05:57:46,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-07-14 05:57:46,759 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:57:46,759 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-14 05:57:46,767 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2022-07-14 05:57:46,965 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-14 05:57:46,966 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting minErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-14 05:57:46,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:57:46,966 INFO L85 PathProgramCache]: Analyzing trace with hash 1591520033, now seen corresponding path program 2 times [2022-07-14 05:57:46,966 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:57:46,966 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1965395096] [2022-07-14 05:57:46,967 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-14 05:57:46,967 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:57:46,967 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:57:46,968 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-14 05:57:46,968 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2022-07-14 05:57:47,117 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-14 05:57:47,117 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-14 05:57:47,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 15 conjunts are in the unsatisfiable core [2022-07-14 05:57:47,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:57:47,246 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-07-14 05:57:47,246 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:57:47,608 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2022-07-14 05:57:47,728 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-07-14 05:57:47,728 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:57:47,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1965395096] [2022-07-14 05:57:47,728 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1965395096] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-14 05:57:47,728 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:57:47,729 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2022-07-14 05:57:47,729 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144662716] [2022-07-14 05:57:47,729 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:57:47,729 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-07-14 05:57:47,729 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:57:47,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-07-14 05:57:47,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=202, Unknown=0, NotChecked=0, Total=240 [2022-07-14 05:57:47,730 INFO L87 Difference]: Start difference. First operand 370 states and 507 transitions. Second operand has 16 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 3 states have call successors, (8) [2022-07-14 05:57:49,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:57:49,682 INFO L93 Difference]: Finished difference Result 374 states and 510 transitions. [2022-07-14 05:57:49,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-07-14 05:57:49,683 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 3 states have call successors, (8) Word has length 39 [2022-07-14 05:57:49,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:57:49,684 INFO L225 Difference]: With dead ends: 374 [2022-07-14 05:57:49,684 INFO L226 Difference]: Without dead ends: 374 [2022-07-14 05:57:49,685 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=70, Invalid=350, Unknown=0, NotChecked=0, Total=420 [2022-07-14 05:57:49,685 INFO L413 NwaCegarLoop]: 196 mSDtfsCounter, 74 mSDsluCounter, 1268 mSDsCounter, 0 mSdLazyCounter, 637 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 1464 SdHoareTripleChecker+Invalid, 656 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 637 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-07-14 05:57:49,685 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 1464 Invalid, 656 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 637 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-07-14 05:57:49,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2022-07-14 05:57:49,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 370. [2022-07-14 05:57:49,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 370 states, 233 states have (on average 1.386266094420601) internal successors, (323), 295 states have internal predecessors, (323), 45 states have call successors, (45), 20 states have call predecessors, (45), 32 states have return successors, (133), 54 states have call predecessors, (133), 45 states have call successors, (133) [2022-07-14 05:57:49,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 370 states to 370 states and 501 transitions. [2022-07-14 05:57:49,693 INFO L78 Accepts]: Start accepts. Automaton has 370 states and 501 transitions. Word has length 39 [2022-07-14 05:57:49,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:57:49,693 INFO L495 AbstractCegarLoop]: Abstraction has 370 states and 501 transitions. [2022-07-14 05:57:49,693 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 3 states have call successors, (8) [2022-07-14 05:57:49,693 INFO L276 IsEmpty]: Start isEmpty. Operand 370 states and 501 transitions. [2022-07-14 05:57:49,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-07-14 05:57:49,694 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:57:49,694 INFO L195 NwaCegarLoop]: trace histogram [7, 5, 5, 5, 5, 5, 5, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1] [2022-07-14 05:57:49,704 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (32)] Ended with exit code 0 [2022-07-14 05:57:49,901 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-14 05:57:49,901 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-14 05:57:49,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:57:49,902 INFO L85 PathProgramCache]: Analyzing trace with hash -1445924117, now seen corresponding path program 3 times [2022-07-14 05:57:49,902 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:57:49,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [11019449] [2022-07-14 05:57:49,902 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-14 05:57:49,902 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:57:49,902 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:57:49,903 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-14 05:57:49,904 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2022-07-14 05:57:50,200 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-07-14 05:57:50,200 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-14 05:57:50,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 17 conjunts are in the unsatisfiable core [2022-07-14 05:57:50,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:57:50,217 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 [2022-07-14 05:57:58,534 INFO L356 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2022-07-14 05:57:58,534 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 [2022-07-14 05:57:58,615 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 77 proven. 25 refuted. 5 times theorem prover too weak. 34 trivial. 0 not checked. [2022-07-14 05:57:58,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:58:00,779 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:58:00,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [11019449] [2022-07-14 05:58:00,779 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [11019449] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:58:00,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1655109017] [2022-07-14 05:58:00,779 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-14 05:58:00,779 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-14 05:58:00,779 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-14 05:58:00,780 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-07-14 05:58:00,781 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2022-07-14 05:58:01,164 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-07-14 05:58:01,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-14 05:58:01,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 17 conjunts are in the unsatisfiable core [2022-07-14 05:58:01,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:58:10,237 INFO L356 Elim1Store]: treesize reduction 34, result has 38.2 percent of original size [2022-07-14 05:58:10,237 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 [2022-07-14 05:58:10,252 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 77 proven. 27 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-07-14 05:58:10,252 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:58:10,555 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1655109017] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:58:10,555 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:58:10,555 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2022-07-14 05:58:10,555 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214451004] [2022-07-14 05:58:10,555 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:58:10,555 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-14 05:58:10,555 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:58:10,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-14 05:58:10,556 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=125, Unknown=5, NotChecked=0, Total=182 [2022-07-14 05:58:10,556 INFO L87 Difference]: Start difference. First operand 370 states and 501 transitions. Second operand has 10 states, 9 states have (on average 4.333333333333333) internal successors, (39), 9 states have internal predecessors, (39), 5 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (9), 7 states have call predecessors, (9), 5 states have call successors, (9) [2022-07-14 05:58:27,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:58:27,598 INFO L93 Difference]: Finished difference Result 410 states and 574 transitions. [2022-07-14 05:58:27,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-07-14 05:58:27,600 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 4.333333333333333) internal successors, (39), 9 states have internal predecessors, (39), 5 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (9), 7 states have call predecessors, (9), 5 states have call successors, (9) Word has length 59 [2022-07-14 05:58:27,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:58:27,602 INFO L225 Difference]: With dead ends: 410 [2022-07-14 05:58:27,602 INFO L226 Difference]: Without dead ends: 410 [2022-07-14 05:58:27,602 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 105 SyntacticMatches, 12 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 36.0s TimeCoverageRelationStatistics Valid=121, Invalid=248, Unknown=11, NotChecked=0, Total=380 [2022-07-14 05:58:27,602 INFO L413 NwaCegarLoop]: 210 mSDtfsCounter, 11 mSDsluCounter, 520 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 730 SdHoareTripleChecker+Invalid, 643 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 568 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-14 05:58:27,603 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 730 Invalid, 643 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 73 Invalid, 0 Unknown, 568 Unchecked, 0.2s Time] [2022-07-14 05:58:27,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2022-07-14 05:58:27,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 407. [2022-07-14 05:58:27,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 407 states, 259 states have (on average 1.3629343629343629) internal successors, (353), 323 states have internal predecessors, (353), 50 states have call successors, (50), 23 states have call predecessors, (50), 38 states have return successors, (163), 60 states have call predecessors, (163), 50 states have call successors, (163) [2022-07-14 05:58:27,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 407 states to 407 states and 566 transitions. [2022-07-14 05:58:27,613 INFO L78 Accepts]: Start accepts. Automaton has 407 states and 566 transitions. Word has length 59 [2022-07-14 05:58:27,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:58:27,613 INFO L495 AbstractCegarLoop]: Abstraction has 407 states and 566 transitions. [2022-07-14 05:58:27,613 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 4.333333333333333) internal successors, (39), 9 states have internal predecessors, (39), 5 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (9), 7 states have call predecessors, (9), 5 states have call successors, (9) [2022-07-14 05:58:27,613 INFO L276 IsEmpty]: Start isEmpty. Operand 407 states and 566 transitions. [2022-07-14 05:58:27,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-07-14 05:58:27,614 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:58:27,614 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2022-07-14 05:58:27,621 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (34)] Forceful destruction successful, exit code 0 [2022-07-14 05:58:27,843 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2022-07-14 05:58:28,028 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-14 05:58:28,028 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting nondet_treeErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 61 more)] === [2022-07-14 05:58:28,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:58:28,028 INFO L85 PathProgramCache]: Analyzing trace with hash -1969763806, now seen corresponding path program 3 times [2022-07-14 05:58:28,028 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:58:28,029 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [478059994] [2022-07-14 05:58:28,029 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-14 05:58:28,029 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:58:28,029 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:58:28,030 INFO L229 MonitoredProcess]: Starting monitored process 35 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-14 05:58:28,030 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2022-07-14 05:58:28,277 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-07-14 05:58:28,277 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-14 05:58:28,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 19 conjunts are in the unsatisfiable core [2022-07-14 05:58:28,292 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:58:28,296 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 [2022-07-14 05:58:28,492 INFO L356 Elim1Store]: treesize reduction 44, result has 20.0 percent of original size [2022-07-14 05:58:28,492 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 19 [2022-07-14 05:58:28,506 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 11 proven. 24 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-07-14 05:58:28,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:58:28,783 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:58:28,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [478059994] [2022-07-14 05:58:28,784 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [478059994] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:58:28,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [555973246] [2022-07-14 05:58:28,784 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-14 05:58:28,784 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-14 05:58:28,784 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-14 05:58:28,785 INFO L229 MonitoredProcess]: Starting monitored process 36 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-07-14 05:58:28,803 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2022-07-14 05:58:29,104 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-07-14 05:58:29,104 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-14 05:58:29,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 25 conjunts are in the unsatisfiable core [2022-07-14 05:58:29,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:58:29,122 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 [2022-07-14 05:58:29,126 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 [2022-07-14 05:58:43,525 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-14 05:58:43,551 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-07-14 05:58:43,552 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 [2022-07-14 05:58:43,566 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-14 05:58:43,566 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 [2022-07-14 05:58:43,580 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 5 proven. 34 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-07-14 05:58:43,581 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:58:57,803 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [555973246] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:58:57,804 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:58:57,804 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 10] total 12 [2022-07-14 05:58:57,804 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1734580678] [2022-07-14 05:58:57,804 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:58:57,804 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-07-14 05:58:57,804 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:58:57,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-07-14 05:58:57,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=189, Unknown=8, NotChecked=0, Total=240 [2022-07-14 05:58:57,805 INFO L87 Difference]: Start difference. First operand 407 states and 566 transitions. Second operand has 13 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 6 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (8), 6 states have call predecessors, (8), 5 states have call successors, (8)