./Ultimate.py --spec ../sv-benchmarks/c/properties/valid-memcleanup.prp --file ../sv-benchmarks/c/verifythis/tree_del_rec.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (memcleanup) Using default analysis Version 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_rec.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-memcleanup) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 448d6e9f7f0c094a8335d652a2766ae983308e33ec1a543ceaed97ae79744722 --- Real Ultimate output --- This is Ultimate 0.2.2-?-f4b24e3 [2022-07-14 05:54:26,286 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-14 05:54:26,287 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-14 05:54:26,343 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-14 05:54:26,344 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-14 05:54:26,345 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-14 05:54:26,346 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-14 05:54:26,347 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-14 05:54:26,348 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-14 05:54:26,349 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-14 05:54:26,349 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-14 05:54:26,350 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-14 05:54:26,350 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-14 05:54:26,351 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-14 05:54:26,352 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-14 05:54:26,352 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-14 05:54:26,353 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-14 05:54:26,354 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-14 05:54:26,355 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-14 05:54:26,356 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-14 05:54:26,357 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-14 05:54:26,357 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-14 05:54:26,358 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-14 05:54:26,359 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-14 05:54:26,359 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-14 05:54:26,361 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-14 05:54:26,361 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-14 05:54:26,361 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-14 05:54:26,362 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-14 05:54:26,362 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-14 05:54:26,363 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-14 05:54:26,364 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-14 05:54:26,365 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-14 05:54:26,365 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-14 05:54:26,366 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-14 05:54:26,367 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-14 05:54:26,367 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-14 05:54:26,367 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-14 05:54:26,367 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-14 05:54:26,368 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-14 05:54:26,368 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-14 05:54:26,369 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-14 05:54:26,369 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-32bit-Automizer_Default.epf [2022-07-14 05:54:26,385 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-14 05:54:26,386 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-14 05:54:26,387 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-14 05:54:26,387 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-14 05:54:26,388 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-07-14 05:54:26,388 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-07-14 05:54:26,389 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-14 05:54:26,389 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-14 05:54:26,389 INFO L138 SettingsManager]: * Use SBE=true [2022-07-14 05:54:26,390 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-14 05:54:26,390 INFO L138 SettingsManager]: * sizeof long=4 [2022-07-14 05:54:26,391 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-07-14 05:54:26,391 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-07-14 05:54:26,391 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-07-14 05:54:26,391 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-14 05:54:26,391 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-07-14 05:54:26,391 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-07-14 05:54:26,392 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-07-14 05:54:26,392 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-07-14 05:54:26,392 INFO L138 SettingsManager]: * sizeof long double=12 [2022-07-14 05:54:26,392 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-14 05:54:26,393 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-14 05:54:26,393 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-14 05:54:26,393 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-07-14 05:54:26,393 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-14 05:54:26,393 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-14 05:54:26,394 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-07-14 05:54:26,394 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-07-14 05:54:26,394 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-07-14 05:54:26,394 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 448d6e9f7f0c094a8335d652a2766ae983308e33ec1a543ceaed97ae79744722 [2022-07-14 05:54:26,615 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-14 05:54:26,635 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-14 05:54:26,637 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-14 05:54:26,638 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-14 05:54:26,638 INFO L275 PluginConnector]: CDTParser initialized [2022-07-14 05:54:26,640 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/verifythis/tree_del_rec.c [2022-07-14 05:54:26,683 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6a86a2068/c59776723e534048922face3d7112b6d/FLAG901a481c4 [2022-07-14 05:54:27,082 INFO L306 CDTParser]: Found 1 translation units. [2022-07-14 05:54:27,083 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_del_rec.c [2022-07-14 05:54:27,089 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6a86a2068/c59776723e534048922face3d7112b6d/FLAG901a481c4 [2022-07-14 05:54:27,103 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6a86a2068/c59776723e534048922face3d7112b6d [2022-07-14 05:54:27,106 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-14 05:54:27,108 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-14 05:54:27,109 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-14 05:54:27,110 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-14 05:54:27,112 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-14 05:54:27,112 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.07 05:54:27" (1/1) ... [2022-07-14 05:54:27,113 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@656bf2cf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:27, skipping insertion in model container [2022-07-14 05:54:27,114 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.07 05:54:27" (1/1) ... [2022-07-14 05:54:27,119 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-14 05:54:27,134 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-14 05:54:27,285 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_del_rec.c[585,598] [2022-07-14 05:54:27,302 WARN L1550 CHandler]: Possible shadowing of function min [2022-07-14 05:54:27,304 WARN L1550 CHandler]: Possible shadowing of function min [2022-07-14 05:54:27,328 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-14 05:54:27,341 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 05:54:27,341 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@24a394c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:27, skipping insertion in model container [2022-07-14 05:54:27,342 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-14 05:54:27,342 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2022-07-14 05:54:27,344 INFO L158 Benchmark]: Toolchain (without parser) took 234.85ms. Allocated memory is still 136.3MB. Free memory was 108.5MB in the beginning and 114.0MB in the end (delta: -5.5MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2022-07-14 05:54:27,346 INFO L158 Benchmark]: CDTParser took 0.17ms. Allocated memory is still 90.2MB. Free memory was 48.6MB in the beginning and 48.5MB in the end (delta: 49.1kB). There was no memory consumed. Max. memory is 16.1GB. [2022-07-14 05:54:27,346 INFO L158 Benchmark]: CACSL2BoogieTranslator took 232.50ms. Allocated memory is still 136.3MB. Free memory was 108.3MB in the beginning and 114.0MB in the end (delta: -5.7MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2022-07-14 05:54:27,348 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17ms. Allocated memory is still 90.2MB. Free memory was 48.6MB in the beginning and 48.5MB in the end (delta: 49.1kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 232.50ms. Allocated memory is still 136.3MB. Free memory was 108.3MB in the beginning and 114.0MB in the end (delta: -5.7MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 28]: Unsupported Syntax Found a cast between two array/pointer types of different sizes while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/verifythis/tree_del_rec.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-memcleanup) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 448d6e9f7f0c094a8335d652a2766ae983308e33ec1a543ceaed97ae79744722 --- Real Ultimate output --- This is Ultimate 0.2.2-?-f4b24e3 [2022-07-14 05:54:28,764 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-14 05:54:28,766 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-14 05:54:28,793 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-14 05:54:28,794 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-14 05:54:28,795 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-14 05:54:28,800 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-14 05:54:28,803 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-14 05:54:28,805 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-14 05:54:28,809 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-14 05:54:28,810 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-14 05:54:28,812 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-14 05:54:28,812 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-14 05:54:28,814 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-14 05:54:28,815 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-14 05:54:28,816 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-14 05:54:28,817 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-14 05:54:28,817 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-14 05:54:28,819 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-14 05:54:28,820 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-14 05:54:28,821 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-14 05:54:28,821 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-14 05:54:28,822 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-14 05:54:28,822 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-14 05:54:28,823 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-14 05:54:28,825 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-14 05:54:28,825 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-14 05:54:28,825 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-14 05:54:28,826 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-14 05:54:28,826 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-14 05:54:28,827 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-14 05:54:28,827 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-14 05:54:28,828 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-14 05:54:28,828 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-14 05:54:28,829 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-14 05:54:28,830 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-14 05:54:28,830 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-14 05:54:28,831 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-14 05:54:28,831 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-14 05:54:28,831 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-14 05:54:28,832 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-14 05:54:28,833 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-14 05:54:28,834 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-32bit-Automizer_Bitvector.epf [2022-07-14 05:54:28,858 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-14 05:54:28,859 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-14 05:54:28,859 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-14 05:54:28,859 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-14 05:54:28,860 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-07-14 05:54:28,860 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-07-14 05:54:28,860 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-14 05:54:28,860 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-14 05:54:28,861 INFO L138 SettingsManager]: * Use SBE=true [2022-07-14 05:54:28,861 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-14 05:54:28,861 INFO L138 SettingsManager]: * sizeof long=4 [2022-07-14 05:54:28,861 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-07-14 05:54:28,861 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-07-14 05:54:28,861 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-07-14 05:54:28,861 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-14 05:54:28,861 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-07-14 05:54:28,861 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-07-14 05:54:28,861 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-07-14 05:54:28,861 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-07-14 05:54:28,862 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2022-07-14 05:54:28,862 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2022-07-14 05:54:28,862 INFO L138 SettingsManager]: * sizeof long double=12 [2022-07-14 05:54:28,862 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-14 05:54:28,862 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-14 05:54:28,862 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-14 05:54:28,862 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-07-14 05:54:28,862 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-14 05:54:28,862 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-14 05:54:28,862 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-07-14 05:54:28,862 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2022-07-14 05:54:28,863 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2022-07-14 05:54:28,863 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-07-14 05:54:28,863 INFO L138 SettingsManager]: * Logic for external solver=AUFBV WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 448d6e9f7f0c094a8335d652a2766ae983308e33ec1a543ceaed97ae79744722 [2022-07-14 05:54:29,116 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-14 05:54:29,134 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-14 05:54:29,138 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-14 05:54:29,138 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-14 05:54:29,139 INFO L275 PluginConnector]: CDTParser initialized [2022-07-14 05:54:29,140 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/verifythis/tree_del_rec.c [2022-07-14 05:54:29,195 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/77fc4033a/c81fba6966b44ac9b8a78e7f2d33d19f/FLAGb6f8af5f7 [2022-07-14 05:54:29,568 INFO L306 CDTParser]: Found 1 translation units. [2022-07-14 05:54:29,568 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_del_rec.c [2022-07-14 05:54:29,573 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/77fc4033a/c81fba6966b44ac9b8a78e7f2d33d19f/FLAGb6f8af5f7 [2022-07-14 05:54:29,588 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/77fc4033a/c81fba6966b44ac9b8a78e7f2d33d19f [2022-07-14 05:54:29,590 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-14 05:54:29,593 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-14 05:54:29,594 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-14 05:54:29,594 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-14 05:54:29,596 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-14 05:54:29,596 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.07 05:54:29" (1/1) ... [2022-07-14 05:54:29,597 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@51efa72a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:29, skipping insertion in model container [2022-07-14 05:54:29,597 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.07 05:54:29" (1/1) ... [2022-07-14 05:54:29,602 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-14 05:54:29,618 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-14 05:54:29,746 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_del_rec.c[585,598] [2022-07-14 05:54:29,762 WARN L1550 CHandler]: Possible shadowing of function min [2022-07-14 05:54:29,764 WARN L1550 CHandler]: Possible shadowing of function min [2022-07-14 05:54:29,828 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-14 05:54:29,846 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2022-07-14 05:54:29,854 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-14 05:54:29,860 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_del_rec.c[585,598] [2022-07-14 05:54:29,865 WARN L1550 CHandler]: Possible shadowing of function min [2022-07-14 05:54:29,869 WARN L1550 CHandler]: Possible shadowing of function min [2022-07-14 05:54:29,878 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-14 05:54:29,888 INFO L203 MainTranslator]: Completed pre-run [2022-07-14 05:54:29,898 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_del_rec.c[585,598] [2022-07-14 05:54:29,907 WARN L1550 CHandler]: Possible shadowing of function min [2022-07-14 05:54:29,909 WARN L1550 CHandler]: Possible shadowing of function min [2022-07-14 05:54:29,914 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-14 05:54:29,930 INFO L208 MainTranslator]: Completed translation [2022-07-14 05:54:29,931 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:29 WrapperNode [2022-07-14 05:54:29,931 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-14 05:54:29,932 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-07-14 05:54:29,932 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-07-14 05:54:29,933 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-07-14 05:54:29,938 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:29" (1/1) ... [2022-07-14 05:54:29,959 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:29" (1/1) ... [2022-07-14 05:54:29,982 INFO L137 Inliner]: procedures = 31, calls = 61, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 75 [2022-07-14 05:54:29,983 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-07-14 05:54:29,984 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-07-14 05:54:29,984 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-07-14 05:54:29,984 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-07-14 05:54:29,991 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:29" (1/1) ... [2022-07-14 05:54:29,991 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:29" (1/1) ... [2022-07-14 05:54:29,999 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:29" (1/1) ... [2022-07-14 05:54:29,999 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:29" (1/1) ... [2022-07-14 05:54:30,007 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:29" (1/1) ... [2022-07-14 05:54:30,010 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:29" (1/1) ... [2022-07-14 05:54:30,012 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:29" (1/1) ... [2022-07-14 05:54:30,015 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-07-14 05:54:30,016 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-07-14 05:54:30,016 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-07-14 05:54:30,016 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-07-14 05:54:30,016 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:29" (1/1) ... [2022-07-14 05:54:30,022 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-14 05:54:30,030 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-14 05:54:30,053 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 05:54:30,071 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-07-14 05:54:30,085 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-07-14 05:54:30,085 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2022-07-14 05:54:30,085 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-07-14 05:54:30,085 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-07-14 05:54:30,085 INFO L130 BoogieDeclarations]: Found specification of procedure tree_del [2022-07-14 05:54:30,085 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_del [2022-07-14 05:54:30,086 INFO L130 BoogieDeclarations]: Found specification of procedure min [2022-07-14 05:54:30,086 INFO L138 BoogieDeclarations]: Found implementation of procedure min [2022-07-14 05:54:30,086 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2022-07-14 05:54:30,086 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2022-07-14 05:54:30,086 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2022-07-14 05:54:30,086 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-07-14 05:54:30,086 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2022-07-14 05:54:30,086 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2022-07-14 05:54:30,087 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-07-14 05:54:30,087 INFO L130 BoogieDeclarations]: Found specification of procedure size [2022-07-14 05:54:30,087 INFO L138 BoogieDeclarations]: Found implementation of procedure size [2022-07-14 05:54:30,087 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-07-14 05:54:30,087 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-07-14 05:54:30,087 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-07-14 05:54:30,087 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-07-14 05:54:30,087 INFO L130 BoogieDeclarations]: Found specification of procedure tree_inorder [2022-07-14 05:54:30,088 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_inorder [2022-07-14 05:54:30,088 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-07-14 05:54:30,088 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2022-07-14 05:54:30,191 INFO L234 CfgBuilder]: Building ICFG [2022-07-14 05:54:30,193 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-07-14 05:54:30,688 INFO L275 CfgBuilder]: Performing block encoding [2022-07-14 05:54:30,695 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-07-14 05:54:30,696 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-07-14 05:54:30,697 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.07 05:54:30 BoogieIcfgContainer [2022-07-14 05:54:30,698 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-07-14 05:54:30,700 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-07-14 05:54:30,700 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-07-14 05:54:30,717 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-07-14 05:54:30,717 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.07 05:54:29" (1/3) ... [2022-07-14 05:54:30,718 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@23b39d55 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.07 05:54:30, skipping insertion in model container [2022-07-14 05:54:30,718 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.07 05:54:29" (2/3) ... [2022-07-14 05:54:30,718 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@23b39d55 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.07 05:54:30, skipping insertion in model container [2022-07-14 05:54:30,718 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.07 05:54:30" (3/3) ... [2022-07-14 05:54:30,719 INFO L111 eAbstractionObserver]: Analyzing ICFG tree_del_rec.c [2022-07-14 05:54:30,729 INFO L201 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-07-14 05:54:30,729 INFO L160 ceAbstractionStarter]: Applying trace abstraction to program that has 55 error locations. [2022-07-14 05:54:30,772 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-14 05:54:30,778 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@5ffe88a1, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@a3cd17a [2022-07-14 05:54:30,778 INFO L358 AbstractCegarLoop]: Starting to check reachability of 55 error locations. [2022-07-14 05:54:30,782 INFO L276 IsEmpty]: Start isEmpty. Operand has 174 states, 89 states have (on average 1.7640449438202248) internal successors, (157), 144 states have internal predecessors, (157), 22 states have call successors, (22), 7 states have call predecessors, (22), 7 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2022-07-14 05:54:30,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-07-14 05:54:30,786 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:54:30,787 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-07-14 05:54:30,788 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 52 more)] === [2022-07-14 05:54:30,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:54:30,791 INFO L85 PathProgramCache]: Analyzing trace with hash 120433579, now seen corresponding path program 1 times [2022-07-14 05:54:30,799 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:54:30,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1092769740] [2022-07-14 05:54:30,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:54:30,801 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:54:30,801 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:54:30,803 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 05:54:30,805 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 05:54:30,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:54:30,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 3 conjunts are in the unsatisfiable core [2022-07-14 05:54:30,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:54:30,913 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 05:54:30,920 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 05:54:30,921 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-14 05:54:30,921 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:54:30,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1092769740] [2022-07-14 05:54:30,922 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1092769740] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-14 05:54:30,922 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-14 05:54:30,922 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-14 05:54:30,923 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1499492680] [2022-07-14 05:54:30,924 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-14 05:54:30,926 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-14 05:54:30,926 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:54:30,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-14 05:54:30,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-14 05:54:30,943 INFO L87 Difference]: Start difference. First operand has 174 states, 89 states have (on average 1.7640449438202248) internal successors, (157), 144 states have internal predecessors, (157), 22 states have call successors, (22), 7 states have call predecessors, (22), 7 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-14 05:54:31,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:54:31,097 INFO L93 Difference]: Finished difference Result 175 states and 200 transitions. [2022-07-14 05:54:31,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-14 05:54:31,099 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 05:54:31,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:54:31,105 INFO L225 Difference]: With dead ends: 175 [2022-07-14 05:54:31,106 INFO L226 Difference]: Without dead ends: 172 [2022-07-14 05:54:31,107 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 05:54:31,109 INFO L413 NwaCegarLoop]: 197 mSDtfsCounter, 6 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-14 05:54:31,109 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 326 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-14 05:54:31,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2022-07-14 05:54:31,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 170. [2022-07-14 05:54:31,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 87 states have (on average 1.7011494252873562) internal successors, (148), 140 states have internal predecessors, (148), 22 states have call successors, (22), 7 states have call predecessors, (22), 7 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2022-07-14 05:54:31,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 192 transitions. [2022-07-14 05:54:31,147 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 192 transitions. Word has length 5 [2022-07-14 05:54:31,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:54:31,148 INFO L495 AbstractCegarLoop]: Abstraction has 170 states and 192 transitions. [2022-07-14 05:54:31,148 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 05:54:31,148 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 192 transitions. [2022-07-14 05:54:31,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-07-14 05:54:31,149 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:54:31,149 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-07-14 05:54:31,157 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 05:54:31,354 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 05:54:31,355 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 52 more)] === [2022-07-14 05:54:31,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:54:31,355 INFO L85 PathProgramCache]: Analyzing trace with hash 120433580, now seen corresponding path program 1 times [2022-07-14 05:54:31,356 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:54:31,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1465389209] [2022-07-14 05:54:31,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:54:31,356 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:54:31,356 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:54:31,357 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 05:54:31,359 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 05:54:31,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:54:31,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2022-07-14 05:54:31,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:54:31,398 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 05:54:31,405 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 05:54:31,406 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-14 05:54:31,406 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:54:31,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1465389209] [2022-07-14 05:54:31,406 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1465389209] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-14 05:54:31,406 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-14 05:54:31,407 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-14 05:54:31,407 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574617772] [2022-07-14 05:54:31,407 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-14 05:54:31,408 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-14 05:54:31,408 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:54:31,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-14 05:54:31,411 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-14 05:54:31,412 INFO L87 Difference]: Start difference. First operand 170 states and 192 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-14 05:54:31,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:54:31,591 INFO L93 Difference]: Finished difference Result 169 states and 191 transitions. [2022-07-14 05:54:31,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-14 05:54:31,592 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 05:54:31,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:54:31,593 INFO L225 Difference]: With dead ends: 169 [2022-07-14 05:54:31,593 INFO L226 Difference]: Without dead ends: 169 [2022-07-14 05:54:31,594 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 05:54:31,594 INFO L413 NwaCegarLoop]: 190 mSDtfsCounter, 2 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 327 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-14 05:54:31,595 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 327 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-14 05:54:31,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2022-07-14 05:54:31,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2022-07-14 05:54:31,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 87 states have (on average 1.6896551724137931) internal successors, (147), 139 states have internal predecessors, (147), 22 states have call successors, (22), 7 states have call predecessors, (22), 7 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2022-07-14 05:54:31,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 191 transitions. [2022-07-14 05:54:31,612 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 191 transitions. Word has length 5 [2022-07-14 05:54:31,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:54:31,612 INFO L495 AbstractCegarLoop]: Abstraction has 169 states and 191 transitions. [2022-07-14 05:54:31,612 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 05:54:31,613 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 191 transitions. [2022-07-14 05:54:31,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-07-14 05:54:31,613 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:54:31,613 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-14 05:54:31,631 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 05:54:31,827 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 05:54:31,827 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting minErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 52 more)] === [2022-07-14 05:54:31,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:54:31,828 INFO L85 PathProgramCache]: Analyzing trace with hash 854953177, now seen corresponding path program 1 times [2022-07-14 05:54:31,828 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:54:31,829 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1805345694] [2022-07-14 05:54:31,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:54:31,829 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:54:31,829 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:54:31,830 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 05:54:31,832 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 05:54:31,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:54:31,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 13 conjunts are in the unsatisfiable core [2022-07-14 05:54:31,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:54:31,932 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 05:54:31,933 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-14 05:54:31,933 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:54:31,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1805345694] [2022-07-14 05:54:31,933 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1805345694] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-14 05:54:31,933 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-14 05:54:31,933 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-07-14 05:54:31,933 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069276520] [2022-07-14 05:54:31,934 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-14 05:54:31,934 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-07-14 05:54:31,934 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:54:31,934 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-07-14 05:54:31,935 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-07-14 05:54:31,935 INFO L87 Difference]: Start difference. First operand 169 states and 191 transitions. Second operand has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-14 05:54:32,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:54:32,065 INFO L93 Difference]: Finished difference Result 233 states and 270 transitions. [2022-07-14 05:54:32,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-14 05:54:32,066 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 05:54:32,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:54:32,067 INFO L225 Difference]: With dead ends: 233 [2022-07-14 05:54:32,067 INFO L226 Difference]: Without dead ends: 233 [2022-07-14 05:54:32,068 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2022-07-14 05:54:32,068 INFO L413 NwaCegarLoop]: 199 mSDtfsCounter, 91 mSDsluCounter, 925 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 1124 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-14 05:54:32,069 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [91 Valid, 1124 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-14 05:54:32,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2022-07-14 05:54:32,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 177. [2022-07-14 05:54:32,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 92 states have (on average 1.6521739130434783) internal successors, (152), 145 states have internal predecessors, (152), 23 states have call successors, (23), 8 states have call predecessors, (23), 9 states have return successors, (26), 23 states have call predecessors, (26), 23 states have call successors, (26) [2022-07-14 05:54:32,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 201 transitions. [2022-07-14 05:54:32,080 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 201 transitions. Word has length 11 [2022-07-14 05:54:32,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:54:32,080 INFO L495 AbstractCegarLoop]: Abstraction has 177 states and 201 transitions. [2022-07-14 05:54:32,080 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 05:54:32,080 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 201 transitions. [2022-07-14 05:54:32,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-07-14 05:54:32,081 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:54:32,081 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-14 05:54:32,089 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 05:54:32,287 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 05:54:32,287 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 52 more)] === [2022-07-14 05:54:32,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:54:32,288 INFO L85 PathProgramCache]: Analyzing trace with hash 873486780, now seen corresponding path program 1 times [2022-07-14 05:54:32,288 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:54:32,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1303569922] [2022-07-14 05:54:32,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:54:32,289 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:54:32,289 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:54:32,290 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 05:54:32,290 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 05:54:32,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:54:32,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 5 conjunts are in the unsatisfiable core [2022-07-14 05:54:32,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:54:32,341 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 05:54:32,368 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 05:54:32,368 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-14 05:54:32,369 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:54:32,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1303569922] [2022-07-14 05:54:32,369 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1303569922] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-14 05:54:32,369 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-14 05:54:32,369 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-14 05:54:32,370 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1839971152] [2022-07-14 05:54:32,370 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-14 05:54:32,370 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-07-14 05:54:32,370 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:54:32,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-07-14 05:54:32,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-07-14 05:54:32,371 INFO L87 Difference]: Start difference. First operand 177 states and 201 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-14 05:54:32,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:54:32,701 INFO L93 Difference]: Finished difference Result 181 states and 205 transitions. [2022-07-14 05:54:32,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-07-14 05:54:32,702 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 05:54:32,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:54:32,703 INFO L225 Difference]: With dead ends: 181 [2022-07-14 05:54:32,703 INFO L226 Difference]: Without dead ends: 181 [2022-07-14 05:54:32,703 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 05:54:32,704 INFO L413 NwaCegarLoop]: 150 mSDtfsCounter, 89 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 247 SdHoareTripleChecker+Invalid, 241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-14 05:54:32,704 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [95 Valid, 247 Invalid, 241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 216 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-07-14 05:54:32,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2022-07-14 05:54:32,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 179. [2022-07-14 05:54:32,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 94 states have (on average 1.6595744680851063) internal successors, (156), 145 states have internal predecessors, (156), 23 states have call successors, (23), 8 states have call predecessors, (23), 9 states have return successors, (26), 25 states have call predecessors, (26), 23 states have call successors, (26) [2022-07-14 05:54:32,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 205 transitions. [2022-07-14 05:54:32,712 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 205 transitions. Word has length 11 [2022-07-14 05:54:32,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:54:32,712 INFO L495 AbstractCegarLoop]: Abstraction has 179 states and 205 transitions. [2022-07-14 05:54:32,713 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 05:54:32,713 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 205 transitions. [2022-07-14 05:54:32,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-07-14 05:54:32,713 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:54:32,713 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-14 05:54:32,719 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Ended with exit code 0 [2022-07-14 05:54:32,919 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 05:54:32,920 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting nondet_treeErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 52 more)] === [2022-07-14 05:54:32,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:54:32,921 INFO L85 PathProgramCache]: Analyzing trace with hash 873486781, now seen corresponding path program 1 times [2022-07-14 05:54:32,921 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:54:32,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [260260068] [2022-07-14 05:54:32,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:54:32,921 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:54:32,922 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:54:32,923 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 05:54:32,924 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 05:54:32,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:54:32,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 6 conjunts are in the unsatisfiable core [2022-07-14 05:54:32,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:54:33,002 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 05:54:33,037 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 05:54:33,037 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-14 05:54:33,037 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:54:33,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [260260068] [2022-07-14 05:54:33,038 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [260260068] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-14 05:54:33,038 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-14 05:54:33,038 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-14 05:54:33,038 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1539601752] [2022-07-14 05:54:33,038 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-14 05:54:33,039 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-07-14 05:54:33,039 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:54:33,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-07-14 05:54:33,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-07-14 05:54:33,041 INFO L87 Difference]: Start difference. First operand 179 states and 205 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-14 05:54:33,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:54:33,394 INFO L93 Difference]: Finished difference Result 185 states and 215 transitions. [2022-07-14 05:54:33,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-07-14 05:54:33,395 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 05:54:33,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:54:33,396 INFO L225 Difference]: With dead ends: 185 [2022-07-14 05:54:33,396 INFO L226 Difference]: Without dead ends: 185 [2022-07-14 05:54:33,396 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 05:54:33,397 INFO L413 NwaCegarLoop]: 153 mSDtfsCounter, 93 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 224 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 224 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-14 05:54:33,397 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 242 Invalid, 248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 224 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-07-14 05:54:33,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2022-07-14 05:54:33,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 182. [2022-07-14 05:54:33,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 96 states have (on average 1.6354166666666667) internal successors, (157), 147 states have internal predecessors, (157), 24 states have call successors, (24), 8 states have call predecessors, (24), 9 states have return successors, (28), 26 states have call predecessors, (28), 24 states have call successors, (28) [2022-07-14 05:54:33,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 209 transitions. [2022-07-14 05:54:33,404 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 209 transitions. Word has length 11 [2022-07-14 05:54:33,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:54:33,404 INFO L495 AbstractCegarLoop]: Abstraction has 182 states and 209 transitions. [2022-07-14 05:54:33,405 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 05:54:33,405 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 209 transitions. [2022-07-14 05:54:33,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-07-14 05:54:33,405 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:54:33,405 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 05:54:33,412 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 05:54:33,612 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 05:54:33,612 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting sizeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 52 more)] === [2022-07-14 05:54:33,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:54:33,612 INFO L85 PathProgramCache]: Analyzing trace with hash -1280810199, now seen corresponding path program 1 times [2022-07-14 05:54:33,612 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:54:33,613 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [260004106] [2022-07-14 05:54:33,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:54:33,613 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:54:33,613 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:54:33,614 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 05:54:33,615 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 05:54:33,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:54:33,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 13 conjunts are in the unsatisfiable core [2022-07-14 05:54:33,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:54:33,720 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 05:54:33,721 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-14 05:54:33,721 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:54:33,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [260004106] [2022-07-14 05:54:33,721 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [260004106] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-14 05:54:33,722 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-14 05:54:33,722 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-07-14 05:54:33,722 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1855290109] [2022-07-14 05:54:33,722 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-14 05:54:33,722 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-07-14 05:54:33,722 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:54:33,723 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-07-14 05:54:33,723 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-07-14 05:54:33,723 INFO L87 Difference]: Start difference. First operand 182 states and 209 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-14 05:54:33,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:54:33,828 INFO L93 Difference]: Finished difference Result 242 states and 282 transitions. [2022-07-14 05:54:33,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-14 05:54:33,829 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 05:54:33,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:54:33,830 INFO L225 Difference]: With dead ends: 242 [2022-07-14 05:54:33,830 INFO L226 Difference]: Without dead ends: 242 [2022-07-14 05:54:33,831 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2022-07-14 05:54:33,831 INFO L413 NwaCegarLoop]: 198 mSDtfsCounter, 90 mSDsluCounter, 925 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 1123 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-14 05:54:33,831 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 1123 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-14 05:54:33,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2022-07-14 05:54:33,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 204. [2022-07-14 05:54:33,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 110 states have (on average 1.5909090909090908) internal successors, (175), 161 states have internal predecessors, (175), 31 states have call successors, (31), 9 states have call predecessors, (31), 10 states have return successors, (35), 33 states have call predecessors, (35), 31 states have call successors, (35) [2022-07-14 05:54:33,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 241 transitions. [2022-07-14 05:54:33,839 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 241 transitions. Word has length 17 [2022-07-14 05:54:33,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:54:33,839 INFO L495 AbstractCegarLoop]: Abstraction has 204 states and 241 transitions. [2022-07-14 05:54:33,839 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 05:54:33,839 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 241 transitions. [2022-07-14 05:54:33,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-07-14 05:54:33,840 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:54:33,840 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 05:54:33,847 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 05:54:34,046 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 05:54:34,046 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 52 more)] === [2022-07-14 05:54:34,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:54:34,047 INFO L85 PathProgramCache]: Analyzing trace with hash -1539264760, now seen corresponding path program 1 times [2022-07-14 05:54:34,047 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:54:34,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1362756806] [2022-07-14 05:54:34,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:54:34,048 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:54:34,048 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:54:34,049 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 05:54:34,049 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 05:54:34,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:54:34,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 11 conjunts are in the unsatisfiable core [2022-07-14 05:54:34,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:54:34,194 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 05:54:34,348 INFO L356 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-07-14 05:54:34,350 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 05:54:34,375 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 05:54:34,491 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:54:34,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1362756806] [2022-07-14 05:54:34,491 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1362756806] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:54:34,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1570487870] [2022-07-14 05:54:34,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:54:34,492 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-14 05:54:34,492 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-14 05:54:34,493 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 05:54:34,496 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 05:54:34,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:54:34,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 12 conjunts are in the unsatisfiable core [2022-07-14 05:54:34,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:54:34,660 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 05:54:36,760 INFO L356 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2022-07-14 05:54:36,761 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 05:54:36,767 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 05:54:36,767 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:54:36,880 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1570487870] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:54:36,880 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:54:36,881 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2022-07-14 05:54:36,881 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1342837910] [2022-07-14 05:54:36,881 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:54:36,881 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-07-14 05:54:36,881 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:54:36,881 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-07-14 05:54:36,882 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=27, Unknown=1, NotChecked=0, Total=42 [2022-07-14 05:54:36,882 INFO L87 Difference]: Start difference. First operand 204 states and 241 transitions. Second operand has 6 states, 5 states have (on average 5.4) internal successors, (27), 6 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-07-14 05:54:43,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:54:43,234 INFO L93 Difference]: Finished difference Result 210 states and 249 transitions. [2022-07-14 05:54:43,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-14 05:54:43,235 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 05:54:43,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:54:43,236 INFO L225 Difference]: With dead ends: 210 [2022-07-14 05:54:43,236 INFO L226 Difference]: Without dead ends: 210 [2022-07-14 05:54:43,236 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 58 SyntacticMatches, 7 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=26, Invalid=44, Unknown=2, NotChecked=0, Total=72 [2022-07-14 05:54:43,236 INFO L413 NwaCegarLoop]: 152 mSDtfsCounter, 86 mSDsluCounter, 206 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 358 SdHoareTripleChecker+Invalid, 517 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 291 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-14 05:54:43,237 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [92 Valid, 358 Invalid, 517 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 203 Invalid, 0 Unknown, 291 Unchecked, 0.3s Time] [2022-07-14 05:54:43,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2022-07-14 05:54:43,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 208. [2022-07-14 05:54:43,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 113 states have (on average 1.584070796460177) internal successors, (179), 164 states have internal predecessors, (179), 31 states have call successors, (31), 9 states have call predecessors, (31), 11 states have return successors, (39), 34 states have call predecessors, (39), 31 states have call successors, (39) [2022-07-14 05:54:43,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 249 transitions. [2022-07-14 05:54:43,243 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 249 transitions. Word has length 29 [2022-07-14 05:54:43,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:54:43,243 INFO L495 AbstractCegarLoop]: Abstraction has 208 states and 249 transitions. [2022-07-14 05:54:43,243 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 05:54:43,243 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 249 transitions. [2022-07-14 05:54:43,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-07-14 05:54:43,244 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:54:43,244 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-14 05:54:43,260 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (9)] Ended with exit code 0 [2022-07-14 05:54:43,457 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 05:54:43,654 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 05:54:43,655 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting nondet_treeErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 52 more)] === [2022-07-14 05:54:43,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:54:43,655 INFO L85 PathProgramCache]: Analyzing trace with hash 1070284721, now seen corresponding path program 1 times [2022-07-14 05:54:43,655 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:54:43,656 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1794097893] [2022-07-14 05:54:43,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:54:43,656 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:54:43,656 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:54:43,657 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 05:54:43,658 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 05:54:43,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:54:43,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 16 conjunts are in the unsatisfiable core [2022-07-14 05:54:43,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:54:43,762 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 05:54:43,766 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 05:54:47,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-14 05:54:47,947 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 05:54:47,954 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-14 05:54:47,955 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 05:54:47,970 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-07-14 05:54:47,970 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:54:50,170 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:54:50,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1794097893] [2022-07-14 05:54:50,170 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1794097893] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:54:50,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [230980475] [2022-07-14 05:54:50,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:54:50,171 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-14 05:54:50,171 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-14 05:54:50,173 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 05:54:50,179 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 05:54:50,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:54:50,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 16 conjunts are in the unsatisfiable core [2022-07-14 05:54:50,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:54:50,325 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 05:54:50,329 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 05:54:56,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-14 05:54:56,496 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 05:54:56,504 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-14 05:54:56,504 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 05:54:56,510 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-07-14 05:54:56,510 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:54:58,783 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [230980475] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:54:58,784 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:54:58,784 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2022-07-14 05:54:58,784 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012759782] [2022-07-14 05:54:58,784 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:54:58,784 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-07-14 05:54:58,784 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:54:58,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-07-14 05:54:58,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=51, Unknown=1, NotChecked=0, Total=72 [2022-07-14 05:54:58,785 INFO L87 Difference]: Start difference. First operand 208 states and 249 transitions. Second operand has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-07-14 05:54:59,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:54:59,455 INFO L93 Difference]: Finished difference Result 227 states and 281 transitions. [2022-07-14 05:54:59,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-07-14 05:54:59,455 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 25 [2022-07-14 05:54:59,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:54:59,457 INFO L225 Difference]: With dead ends: 227 [2022-07-14 05:54:59,457 INFO L226 Difference]: Without dead ends: 227 [2022-07-14 05:54:59,457 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 40 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=27, Invalid=62, Unknown=1, NotChecked=0, Total=90 [2022-07-14 05:54:59,457 INFO L413 NwaCegarLoop]: 144 mSDtfsCounter, 102 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 296 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 512 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 183 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-07-14 05:54:59,457 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [108 Valid, 310 Invalid, 512 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 296 Invalid, 0 Unknown, 183 Unchecked, 0.6s Time] [2022-07-14 05:54:59,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2022-07-14 05:54:59,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 224. [2022-07-14 05:54:59,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 124 states have (on average 1.532258064516129) internal successors, (190), 176 states have internal predecessors, (190), 34 states have call successors, (34), 10 states have call predecessors, (34), 13 states have return successors, (48), 37 states have call predecessors, (48), 34 states have call successors, (48) [2022-07-14 05:54:59,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 272 transitions. [2022-07-14 05:54:59,464 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 272 transitions. Word has length 25 [2022-07-14 05:54:59,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:54:59,464 INFO L495 AbstractCegarLoop]: Abstraction has 224 states and 272 transitions. [2022-07-14 05:54:59,465 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-07-14 05:54:59,465 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 272 transitions. [2022-07-14 05:54:59,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-07-14 05:54:59,465 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:54:59,465 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 05:54:59,478 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 05:54:59,674 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2022-07-14 05:54:59,866 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 05:54:59,866 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting minErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 52 more)] === [2022-07-14 05:54:59,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:54:59,867 INFO L85 PathProgramCache]: Analyzing trace with hash -1668050227, now seen corresponding path program 1 times [2022-07-14 05:54:59,867 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:54:59,867 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [10115804] [2022-07-14 05:54:59,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:54:59,867 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:54:59,867 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:54:59,868 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 05:54:59,870 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 05:54:59,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:54:59,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 13 conjunts are in the unsatisfiable core [2022-07-14 05:54:59,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:54:59,955 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 05:55:00,066 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 05:55:00,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:55:00,217 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 05:55:00,218 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:55:00,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [10115804] [2022-07-14 05:55:00,218 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [10115804] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-14 05:55:00,218 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:55:00,218 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2022-07-14 05:55:00,218 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1612405502] [2022-07-14 05:55:00,218 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:55:00,219 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-14 05:55:00,219 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:55:00,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-14 05:55:00,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2022-07-14 05:55:00,219 INFO L87 Difference]: Start difference. First operand 224 states and 272 transitions. Second operand has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-07-14 05:55:01,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:55:01,569 INFO L93 Difference]: Finished difference Result 244 states and 296 transitions. [2022-07-14 05:55:01,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-07-14 05:55:01,570 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 05:55:01,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:55:01,571 INFO L225 Difference]: With dead ends: 244 [2022-07-14 05:55:01,571 INFO L226 Difference]: Without dead ends: 244 [2022-07-14 05:55:01,571 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 05:55:01,572 INFO L413 NwaCegarLoop]: 162 mSDtfsCounter, 158 mSDsluCounter, 501 mSDsCounter, 0 mSdLazyCounter, 988 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 162 SdHoareTripleChecker+Valid, 663 SdHoareTripleChecker+Invalid, 1096 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 988 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 55 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-07-14 05:55:01,572 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [162 Valid, 663 Invalid, 1096 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 988 Invalid, 0 Unknown, 55 Unchecked, 1.2s Time] [2022-07-14 05:55:01,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2022-07-14 05:55:01,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 236. [2022-07-14 05:55:01,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 236 states, 135 states have (on average 1.5185185185185186) internal successors, (205), 185 states have internal predecessors, (205), 36 states have call successors, (36), 11 states have call predecessors, (36), 14 states have return successors, (50), 39 states have call predecessors, (50), 36 states have call successors, (50) [2022-07-14 05:55:01,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 291 transitions. [2022-07-14 05:55:01,579 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 291 transitions. Word has length 25 [2022-07-14 05:55:01,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:55:01,579 INFO L495 AbstractCegarLoop]: Abstraction has 236 states and 291 transitions. [2022-07-14 05:55:01,579 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 05:55:01,579 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 291 transitions. [2022-07-14 05:55:01,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-07-14 05:55:01,580 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:55:01,580 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 05:55:01,587 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 05:55:01,787 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 05:55:01,787 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting minErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 52 more)] === [2022-07-14 05:55:01,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:55:01,787 INFO L85 PathProgramCache]: Analyzing trace with hash -1668050226, now seen corresponding path program 1 times [2022-07-14 05:55:01,788 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:55:01,788 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [798644309] [2022-07-14 05:55:01,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:55:01,788 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:55:01,788 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:55:01,789 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 05:55:01,790 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 05:55:01,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:55:01,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 20 conjunts are in the unsatisfiable core [2022-07-14 05:55:01,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:55:01,883 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 05:55:02,048 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 05:55:02,048 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:55:02,839 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 05:55:02,839 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:55:02,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [798644309] [2022-07-14 05:55:02,839 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [798644309] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-14 05:55:02,839 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:55:02,839 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2022-07-14 05:55:02,839 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308029301] [2022-07-14 05:55:02,840 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:55:02,840 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-07-14 05:55:02,840 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:55:02,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-07-14 05:55:02,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2022-07-14 05:55:02,840 INFO L87 Difference]: Start difference. First operand 236 states and 291 transitions. Second operand has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-07-14 05:55:06,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:55:06,893 INFO L93 Difference]: Finished difference Result 261 states and 327 transitions. [2022-07-14 05:55:06,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-07-14 05:55:06,894 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 05:55:06,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:55:06,896 INFO L225 Difference]: With dead ends: 261 [2022-07-14 05:55:06,896 INFO L226 Difference]: Without dead ends: 261 [2022-07-14 05:55:06,896 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=74, Invalid=388, Unknown=0, NotChecked=0, Total=462 [2022-07-14 05:55:06,897 INFO L413 NwaCegarLoop]: 156 mSDtfsCounter, 143 mSDsluCounter, 567 mSDsCounter, 0 mSdLazyCounter, 1488 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 723 SdHoareTripleChecker+Invalid, 1579 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 1488 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 47 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2022-07-14 05:55:06,897 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [148 Valid, 723 Invalid, 1579 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 1488 Invalid, 0 Unknown, 47 Unchecked, 3.8s Time] [2022-07-14 05:55:06,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2022-07-14 05:55:06,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 252. [2022-07-14 05:55:06,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 147 states have (on average 1.4965986394557824) internal successors, (220), 197 states have internal predecessors, (220), 39 states have call successors, (39), 12 states have call predecessors, (39), 15 states have return successors, (53), 42 states have call predecessors, (53), 39 states have call successors, (53) [2022-07-14 05:55:06,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 312 transitions. [2022-07-14 05:55:06,906 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 312 transitions. Word has length 25 [2022-07-14 05:55:06,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:55:06,906 INFO L495 AbstractCegarLoop]: Abstraction has 252 states and 312 transitions. [2022-07-14 05:55:06,907 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 05:55:06,907 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 312 transitions. [2022-07-14 05:55:06,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [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 [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 05:55:06,920 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 05:55:07,117 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 05:55:07,117 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting tree_inorderErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 52 more)] === [2022-07-14 05:55:07,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:55:07,118 INFO L85 PathProgramCache]: Analyzing trace with hash 369889479, now seen corresponding path program 1 times [2022-07-14 05:55:07,118 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:55:07,118 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [185513773] [2022-07-14 05:55:07,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:55:07,118 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:55:07,118 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:55:07,124 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 05:55:07,126 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 05:55:07,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:55:07,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 6 conjunts are in the unsatisfiable core [2022-07-14 05:55:07,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:55:07,225 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 05:55:07,225 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-14 05:55:07,225 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:55:07,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [185513773] [2022-07-14 05:55:07,225 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [185513773] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-14 05:55:07,225 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-14 05:55:07,225 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-07-14 05:55:07,225 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1712389919] [2022-07-14 05:55:07,225 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-14 05:55:07,226 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-07-14 05:55:07,226 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:55:07,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-07-14 05:55:07,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-07-14 05:55:07,226 INFO L87 Difference]: Start difference. First operand 252 states and 312 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2022-07-14 05:55:07,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:55:07,252 INFO L93 Difference]: Finished difference Result 242 states and 293 transitions. [2022-07-14 05:55:07,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-07-14 05:55:07,253 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 05:55:07,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:55:07,254 INFO L225 Difference]: With dead ends: 242 [2022-07-14 05:55:07,255 INFO L226 Difference]: Without dead ends: 226 [2022-07-14 05:55:07,255 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 05:55:07,255 INFO L413 NwaCegarLoop]: 188 mSDtfsCounter, 0 mSDsluCounter, 556 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 744 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 05:55:07,256 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 744 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-14 05:55:07,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2022-07-14 05:55:07,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 226. [2022-07-14 05:55:07,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 130 states have (on average 1.5307692307692307) internal successors, (199), 181 states have internal predecessors, (199), 31 states have call successors, (31), 10 states have call predecessors, (31), 14 states have return successors, (47), 34 states have call predecessors, (47), 31 states have call successors, (47) [2022-07-14 05:55:07,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 277 transitions. [2022-07-14 05:55:07,267 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 277 transitions. Word has length 30 [2022-07-14 05:55:07,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:55:07,267 INFO L495 AbstractCegarLoop]: Abstraction has 226 states and 277 transitions. [2022-07-14 05:55:07,267 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 05:55:07,267 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 277 transitions. [2022-07-14 05:55:07,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-07-14 05:55:07,270 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:55:07,271 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 05:55:07,289 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 05:55:07,477 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 05:55:07,478 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting sizeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 52 more)] === [2022-07-14 05:55:07,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:55:07,478 INFO L85 PathProgramCache]: Analyzing trace with hash -648076771, now seen corresponding path program 1 times [2022-07-14 05:55:07,479 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:55:07,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1327634855] [2022-07-14 05:55:07,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:55:07,479 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:55:07,479 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:55:07,480 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 05:55:07,482 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 05:55:07,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:55:07,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2022-07-14 05:55:07,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:55:07,616 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 05:55:07,617 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-14 05:55:07,617 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:55:07,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1327634855] [2022-07-14 05:55:07,617 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1327634855] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-14 05:55:07,617 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-14 05:55:07,617 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-07-14 05:55:07,618 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974908607] [2022-07-14 05:55:07,618 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-14 05:55:07,618 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-07-14 05:55:07,618 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:55:07,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-07-14 05:55:07,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-07-14 05:55:07,619 INFO L87 Difference]: Start difference. First operand 226 states and 277 transitions. Second operand has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-07-14 05:55:07,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:55:07,895 INFO L93 Difference]: Finished difference Result 232 states and 286 transitions. [2022-07-14 05:55:07,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-14 05:55:07,896 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 05:55:07,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:55:07,897 INFO L225 Difference]: With dead ends: 232 [2022-07-14 05:55:07,897 INFO L226 Difference]: Without dead ends: 228 [2022-07-14 05:55:07,897 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2022-07-14 05:55:07,898 INFO L413 NwaCegarLoop]: 171 mSDtfsCounter, 109 mSDsluCounter, 846 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 1017 SdHoareTripleChecker+Invalid, 201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-14 05:55:07,898 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [113 Valid, 1017 Invalid, 201 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 177 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-14 05:55:07,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2022-07-14 05:55:07,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 226. [2022-07-14 05:55:07,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 130 states have (on average 1.5153846153846153) internal successors, (197), 181 states have internal predecessors, (197), 31 states have call successors, (31), 10 states have call predecessors, (31), 14 states have return successors, (47), 34 states have call predecessors, (47), 31 states have call successors, (47) [2022-07-14 05:55:07,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 275 transitions. [2022-07-14 05:55:07,903 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 275 transitions. Word has length 31 [2022-07-14 05:55:07,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:55:07,903 INFO L495 AbstractCegarLoop]: Abstraction has 226 states and 275 transitions. [2022-07-14 05:55:07,904 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 05:55:07,904 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 275 transitions. [2022-07-14 05:55:07,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-07-14 05:55:07,904 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:55:07,904 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 05:55:07,925 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 05:55:08,104 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 05:55:08,105 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting minErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 52 more)] === [2022-07-14 05:55:08,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:55:08,105 INFO L85 PathProgramCache]: Analyzing trace with hash -2088825952, now seen corresponding path program 1 times [2022-07-14 05:55:08,105 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:55:08,105 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1771267234] [2022-07-14 05:55:08,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:55:08,106 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:55:08,106 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:55:08,107 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 05:55:08,108 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 05:55:08,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:55:08,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 37 conjunts are in the unsatisfiable core [2022-07-14 05:55:08,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:55:08,249 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 05:55:08,256 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 05:55:08,338 INFO L356 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2022-07-14 05:55:08,339 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 05:55:08,346 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-14 05:55:08,347 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 05:55:08,531 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 05:55:08,534 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 05:55:08,618 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 05:55:08,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:55:09,280 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 05:55:09,281 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:55:09,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1771267234] [2022-07-14 05:55:09,281 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1771267234] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-14 05:55:09,281 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:55:09,281 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2022-07-14 05:55:09,281 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097227681] [2022-07-14 05:55:09,281 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:55:09,281 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-07-14 05:55:09,281 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:55:09,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-07-14 05:55:09,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2022-07-14 05:55:09,282 INFO L87 Difference]: Start difference. First operand 226 states and 275 transitions. Second operand has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 4 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2022-07-14 05:55:10,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:55:10,144 INFO L93 Difference]: Finished difference Result 244 states and 299 transitions. [2022-07-14 05:55:10,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-07-14 05:55:10,145 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 05:55:10,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:55:10,146 INFO L225 Difference]: With dead ends: 244 [2022-07-14 05:55:10,146 INFO L226 Difference]: Without dead ends: 244 [2022-07-14 05:55:10,146 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2022-07-14 05:55:10,146 INFO L413 NwaCegarLoop]: 191 mSDtfsCounter, 44 mSDsluCounter, 2004 mSDsCounter, 0 mSdLazyCounter, 370 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 2195 SdHoareTripleChecker+Invalid, 497 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 370 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 113 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-07-14 05:55:10,147 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 2195 Invalid, 497 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 370 Invalid, 0 Unknown, 113 Unchecked, 0.7s Time] [2022-07-14 05:55:10,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2022-07-14 05:55:10,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 233. [2022-07-14 05:55:10,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 135 states have (on average 1.5037037037037038) internal successors, (203), 186 states have internal predecessors, (203), 31 states have call successors, (31), 12 states have call predecessors, (31), 16 states have return successors, (47), 34 states have call predecessors, (47), 31 states have call successors, (47) [2022-07-14 05:55:10,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 281 transitions. [2022-07-14 05:55:10,152 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 281 transitions. Word has length 31 [2022-07-14 05:55:10,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:55:10,152 INFO L495 AbstractCegarLoop]: Abstraction has 233 states and 281 transitions. [2022-07-14 05:55:10,152 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 05:55:10,152 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 281 transitions. [2022-07-14 05:55:10,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-07-14 05:55:10,153 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:55:10,153 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1] [2022-07-14 05:55:10,165 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Ended with exit code 0 [2022-07-14 05:55:10,363 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 05:55:10,364 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting nondet_treeErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 52 more)] === [2022-07-14 05:55:10,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:55:10,364 INFO L85 PathProgramCache]: Analyzing trace with hash 1361134830, now seen corresponding path program 1 times [2022-07-14 05:55:10,365 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:55:10,365 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [546139157] [2022-07-14 05:55:10,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:55:10,365 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:55:10,365 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:55:10,366 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 05:55:10,367 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 05:55:10,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:55:10,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 20 conjunts are in the unsatisfiable core [2022-07-14 05:55:10,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:55:10,637 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 05:55:10,641 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 05:55:16,859 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-14 05:55:16,860 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 05:55:16,873 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-14 05:55:16,873 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 05:55:16,896 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 60 proven. 21 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-07-14 05:55:16,896 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:55:19,341 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:55:19,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [546139157] [2022-07-14 05:55:19,341 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [546139157] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:55:19,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1444277929] [2022-07-14 05:55:19,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:55:19,342 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-14 05:55:19,342 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-14 05:55:19,343 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 05:55:19,344 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 05:55:19,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:55:19,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 20 conjunts are in the unsatisfiable core [2022-07-14 05:55:19,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:55:19,594 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 05:55:19,600 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 05:55:23,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-14 05:55:23,753 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 05:55:23,760 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-14 05:55:23,760 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 05:55:23,764 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 60 proven. 21 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-07-14 05:55:23,765 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:55:25,948 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1444277929] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:55:25,948 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:55:25,948 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2022-07-14 05:55:25,948 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374472585] [2022-07-14 05:55:25,948 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:55:25,949 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-07-14 05:55:25,949 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:55:25,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-07-14 05:55:25,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=50, Unknown=2, NotChecked=0, Total=72 [2022-07-14 05:55:25,949 INFO L87 Difference]: Start difference. First operand 233 states and 281 transitions. Second operand has 7 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 3 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2022-07-14 05:55:26,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:55:26,362 INFO L93 Difference]: Finished difference Result 238 states and 292 transitions. [2022-07-14 05:55:26,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-07-14 05:55:26,363 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 51 [2022-07-14 05:55:26,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:55:26,364 INFO L225 Difference]: With dead ends: 238 [2022-07-14 05:55:26,364 INFO L226 Difference]: Without dead ends: 238 [2022-07-14 05:55:26,364 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 92 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 14.6s TimeCoverageRelationStatistics Valid=27, Invalid=61, Unknown=2, NotChecked=0, Total=90 [2022-07-14 05:55:26,365 INFO L413 NwaCegarLoop]: 138 mSDtfsCounter, 93 mSDsluCounter, 159 mSDsCounter, 0 mSdLazyCounter, 273 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 297 SdHoareTripleChecker+Invalid, 470 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 172 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-07-14 05:55:26,365 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [99 Valid, 297 Invalid, 470 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 273 Invalid, 0 Unknown, 172 Unchecked, 0.4s Time] [2022-07-14 05:55:26,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2022-07-14 05:55:26,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 234. [2022-07-14 05:55:26,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 234 states, 136 states have (on average 1.5073529411764706) internal successors, (205), 186 states have internal predecessors, (205), 31 states have call successors, (31), 12 states have call predecessors, (31), 16 states have return successors, (47), 35 states have call predecessors, (47), 31 states have call successors, (47) [2022-07-14 05:55:26,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 283 transitions. [2022-07-14 05:55:26,377 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 283 transitions. Word has length 51 [2022-07-14 05:55:26,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:55:26,378 INFO L495 AbstractCegarLoop]: Abstraction has 234 states and 283 transitions. [2022-07-14 05:55:26,378 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 05:55:26,378 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 283 transitions. [2022-07-14 05:55:26,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-07-14 05:55:26,378 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:55:26,379 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 05:55:26,387 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Ended with exit code 0 [2022-07-14 05:55:26,586 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Ended with exit code 0 [2022-07-14 05:55:26,784 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 05:55:26,784 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting nondet_treeErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 52 more)] === [2022-07-14 05:55:26,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:55:26,784 INFO L85 PathProgramCache]: Analyzing trace with hash 372322017, now seen corresponding path program 1 times [2022-07-14 05:55:26,784 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:55:26,785 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1422011865] [2022-07-14 05:55:26,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:55:26,785 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:55:26,785 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:55:26,786 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 05:55:26,786 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 05:55:26,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:55:26,907 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 13 conjunts are in the unsatisfiable core [2022-07-14 05:55:26,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:55:26,911 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 05:55:27,038 INFO L356 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-07-14 05:55:27,038 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 05:55:27,044 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 05:55:27,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:55:27,144 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:55:27,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1422011865] [2022-07-14 05:55:27,145 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1422011865] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:55:27,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [976151342] [2022-07-14 05:55:27,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:55:27,145 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-14 05:55:27,145 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-14 05:55:27,146 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 05:55:27,151 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 05:55:27,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:55:27,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 14 conjunts are in the unsatisfiable core [2022-07-14 05:55:27,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:55:27,310 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 05:55:29,389 INFO L356 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2022-07-14 05:55:29,389 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 05:55:29,396 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 05:55:29,396 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:55:29,520 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [976151342] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:55:29,520 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:55:29,520 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2022-07-14 05:55:29,523 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325799281] [2022-07-14 05:55:29,523 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:55:29,523 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-07-14 05:55:29,523 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:55:29,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-07-14 05:55:29,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=27, Unknown=1, NotChecked=0, Total=42 [2022-07-14 05:55:29,524 INFO L87 Difference]: Start difference. First operand 234 states and 283 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 05:55:35,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:55:35,871 INFO L93 Difference]: Finished difference Result 234 states and 282 transitions. [2022-07-14 05:55:35,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-14 05:55:35,872 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 05:55:35,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:55:35,873 INFO L225 Difference]: With dead ends: 234 [2022-07-14 05:55:35,873 INFO L226 Difference]: Without dead ends: 234 [2022-07-14 05:55:35,873 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 62 SyntacticMatches, 7 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=26, Invalid=44, Unknown=2, NotChecked=0, Total=72 [2022-07-14 05:55:35,873 INFO L413 NwaCegarLoop]: 157 mSDtfsCounter, 83 mSDsluCounter, 208 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 365 SdHoareTripleChecker+Invalid, 516 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 298 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-14 05:55:35,874 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 365 Invalid, 516 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 196 Invalid, 0 Unknown, 298 Unchecked, 0.3s Time] [2022-07-14 05:55:35,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2022-07-14 05:55:35,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 233. [2022-07-14 05:55:35,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 135 states have (on average 1.5037037037037038) internal successors, (203), 186 states have internal predecessors, (203), 31 states have call successors, (31), 12 states have call predecessors, (31), 16 states have return successors, (47), 34 states have call predecessors, (47), 31 states have call successors, (47) [2022-07-14 05:55:35,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 281 transitions. [2022-07-14 05:55:35,878 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 281 transitions. Word has length 31 [2022-07-14 05:55:35,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:55:35,879 INFO L495 AbstractCegarLoop]: Abstraction has 233 states and 281 transitions. [2022-07-14 05:55:35,879 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 05:55:35,879 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 281 transitions. [2022-07-14 05:55:35,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-07-14 05:55:35,880 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:55:35,880 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 05:55:35,891 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 05:55:36,090 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2022-07-14 05:55:36,283 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 05:55:36,283 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 52 more)] === [2022-07-14 05:55:36,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:55:36,283 INFO L85 PathProgramCache]: Analyzing trace with hash 1901629290, now seen corresponding path program 2 times [2022-07-14 05:55:36,284 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:55:36,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [868798845] [2022-07-14 05:55:36,284 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-14 05:55:36,284 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:55:36,284 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:55:36,285 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 05:55:36,286 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 05:55:36,465 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-14 05:55:36,465 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-14 05:55:36,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 17 conjunts are in the unsatisfiable core [2022-07-14 05:55:36,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:55:36,478 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 05:55:40,651 INFO L356 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2022-07-14 05:55:40,651 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 05:55:40,733 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 05:55:40,733 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:55:42,924 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:55:42,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [868798845] [2022-07-14 05:55:42,924 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [868798845] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:55:42,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2124121532] [2022-07-14 05:55:42,924 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-14 05:55:42,924 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-14 05:55:42,924 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-14 05:55:42,925 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 05:55:42,926 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 05:55:43,115 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-14 05:55:43,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2037115453] [2022-07-14 05:55:43,115 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-14 05:55:43,116 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-14 05:55:43,116 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-14 05:55:43,117 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 1 [2022-07-14 05:55:43,117 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 05:55:43,118 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 05:55:43,286 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-14 05:55:43,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-14 05:55:43,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 17 conjunts are in the unsatisfiable core [2022-07-14 05:55:43,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:55:43,296 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 05:55:51,589 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-14 05:55:51,608 INFO L356 Elim1Store]: treesize reduction 24, result has 46.7 percent of original size [2022-07-14 05:55:51,608 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 05:55:51,624 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 05:55:51,624 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:55:51,779 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2037115453] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:55:51,779 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:55:51,779 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2022-07-14 05:55:51,779 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91506620] [2022-07-14 05:55:51,779 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:55:51,779 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-14 05:55:51,779 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:55:51,780 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-14 05:55:51,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=96, Unknown=5, NotChecked=0, Total=132 [2022-07-14 05:55:51,780 INFO L87 Difference]: Start difference. First operand 233 states and 281 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 05:56:14,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:56:14,221 INFO L93 Difference]: Finished difference Result 271 states and 338 transitions. [2022-07-14 05:56:14,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-07-14 05:56:14,221 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 05:56:14,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:56:14,222 INFO L225 Difference]: With dead ends: 271 [2022-07-14 05:56:14,222 INFO L226 Difference]: Without dead ends: 271 [2022-07-14 05:56:14,222 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 94 SyntacticMatches, 6 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 36.7s TimeCoverageRelationStatistics Valid=76, Invalid=184, Unknown=12, NotChecked=0, Total=272 [2022-07-14 05:56:14,223 INFO L413 NwaCegarLoop]: 198 mSDtfsCounter, 16 mSDsluCounter, 402 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 600 SdHoareTripleChecker+Invalid, 630 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 563 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-14 05:56:14,223 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 600 Invalid, 630 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 64 Invalid, 0 Unknown, 563 Unchecked, 0.1s Time] [2022-07-14 05:56:14,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2022-07-14 05:56:14,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 270. [2022-07-14 05:56:14,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 161 states have (on average 1.4472049689440993) internal successors, (233), 213 states have internal predecessors, (233), 36 states have call successors, (36), 15 states have call predecessors, (36), 22 states have return successors, (69), 41 states have call predecessors, (69), 36 states have call successors, (69) [2022-07-14 05:56:14,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 338 transitions. [2022-07-14 05:56:14,234 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 338 transitions. Word has length 49 [2022-07-14 05:56:14,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:56:14,234 INFO L495 AbstractCegarLoop]: Abstraction has 270 states and 338 transitions. [2022-07-14 05:56:14,234 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 05:56:14,234 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 338 transitions. [2022-07-14 05:56:14,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-07-14 05:56:14,235 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:56:14,235 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 05:56:14,243 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 05:56:14,460 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 05:56:14,643 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 05:56:14,643 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting nondet_treeErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 52 more)] === [2022-07-14 05:56:14,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:56:14,644 INFO L85 PathProgramCache]: Analyzing trace with hash -1545271268, now seen corresponding path program 2 times [2022-07-14 05:56:14,644 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:56:14,644 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [258078676] [2022-07-14 05:56:14,644 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-14 05:56:14,644 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:56:14,644 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:56:14,645 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 05:56:14,649 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 05:56:14,872 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-14 05:56:14,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-14 05:56:14,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 26 conjunts are in the unsatisfiable core [2022-07-14 05:56:14,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:56:14,891 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 05:56:14,899 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 05:56:19,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-14 05:56:19,131 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-07-14 05:56:19,132 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 05:56:19,142 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-14 05:56:19,142 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 05:56:19,179 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 05:56:19,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:56:21,360 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_nondet_tree_~n~0.base_87 (_ BitVec 32)) (v_ArrVal_1174 (_ 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_1174) 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 05:56:21,364 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:56:21,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [258078676] [2022-07-14 05:56:21,364 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [258078676] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:56:21,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1743978290] [2022-07-14 05:56:21,364 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-14 05:56:21,365 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-14 05:56:21,365 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-14 05:56:21,366 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 05:56:21,366 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 05:56:21,602 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-14 05:56:21,602 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-14 05:56:21,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 26 conjunts are in the unsatisfiable core [2022-07-14 05:56:21,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:56:21,619 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 05:56:21,623 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 05:56:27,811 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-14 05:56:27,831 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-07-14 05:56:27,831 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 05:56:27,841 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-14 05:56:27,841 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 05:56:27,851 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 05:56:27,851 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:56:29,999 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_nondet_tree_~n~0.base_98 (_ BitVec 32)) (v_nondet_tree_~n~0.base_97 (_ BitVec 32)) (v_ArrVal_1286 (_ BitVec 32))) (or (not (= (_ bv0 1) (bvneg (select |c_#valid| v_nondet_tree_~n~0.base_97)))) (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_97 v_ArrVal_1286) v_nondet_tree_~n~0.base_98 (_ bv12 32)) c_nondet_tree_~n~0.base)))))) is different from false [2022-07-14 05:56:30,003 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1743978290] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:56:30,003 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:56:30,003 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2022-07-14 05:56:30,003 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604459210] [2022-07-14 05:56:30,003 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:56:30,004 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-07-14 05:56:30,004 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:56:30,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-07-14 05:56:30,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=70, Unknown=3, NotChecked=34, Total=132 [2022-07-14 05:56:30,004 INFO L87 Difference]: Start difference. First operand 270 states and 338 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 05:56:32,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:56:32,657 INFO L93 Difference]: Finished difference Result 276 states and 355 transitions. [2022-07-14 05:56:32,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-07-14 05:56:32,658 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 05:56:32,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:56:32,659 INFO L225 Difference]: With dead ends: 276 [2022-07-14 05:56:32,659 INFO L226 Difference]: Without dead ends: 276 [2022-07-14 05:56:32,659 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 99 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 16.3s TimeCoverageRelationStatistics Valid=32, Invalid=82, Unknown=4, NotChecked=38, Total=156 [2022-07-14 05:56:32,659 INFO L413 NwaCegarLoop]: 139 mSDtfsCounter, 88 mSDsluCounter, 289 mSDsCounter, 0 mSdLazyCounter, 399 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 428 SdHoareTripleChecker+Invalid, 902 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 399 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 479 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-07-14 05:56:32,660 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [94 Valid, 428 Invalid, 902 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 399 Invalid, 0 Unknown, 479 Unchecked, 0.6s Time] [2022-07-14 05:56:32,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2022-07-14 05:56:32,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 275. [2022-07-14 05:56:32,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 275 states, 165 states have (on average 1.4424242424242424) internal successors, (238), 216 states have internal predecessors, (238), 36 states have call successors, (36), 15 states have call predecessors, (36), 23 states have return successors, (81), 43 states have call predecessors, (81), 36 states have call successors, (81) [2022-07-14 05:56:32,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 355 transitions. [2022-07-14 05:56:32,665 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 355 transitions. Word has length 55 [2022-07-14 05:56:32,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:56:32,666 INFO L495 AbstractCegarLoop]: Abstraction has 275 states and 355 transitions. [2022-07-14 05:56:32,666 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 05:56:32,666 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 355 transitions. [2022-07-14 05:56:32,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-07-14 05:56:32,666 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:56:32,666 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 05:56:32,670 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 05:56:32,878 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 05:56:33,067 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 05:56:33,067 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting nondet_treeErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 52 more)] === [2022-07-14 05:56:33,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:56:33,067 INFO L85 PathProgramCache]: Analyzing trace with hash -1545271269, now seen corresponding path program 2 times [2022-07-14 05:56:33,068 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:56:33,068 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2144820434] [2022-07-14 05:56:33,068 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-14 05:56:33,068 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:56:33,068 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:56:33,069 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 05:56:33,069 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 05:56:33,280 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-14 05:56:33,280 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-14 05:56:33,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 19 conjunts are in the unsatisfiable core [2022-07-14 05:56:33,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:56:33,294 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 05:56:37,495 INFO L356 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2022-07-14 05:56:37,496 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 05:56:37,548 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 05:56:37,548 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:56:39,647 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:56:39,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2144820434] [2022-07-14 05:56:39,648 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2144820434] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:56:39,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1887256674] [2022-07-14 05:56:39,648 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-14 05:56:39,648 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-14 05:56:39,648 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-14 05:56:39,649 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 05:56:39,650 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 05:56:39,876 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-14 05:56:39,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1283909361] [2022-07-14 05:56:39,876 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-14 05:56:39,876 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-14 05:56:39,877 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-14 05:56:39,878 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 05:56:39,880 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (27)] Ended with exit code 1 [2022-07-14 05:56:39,885 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 05:56:40,029 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-14 05:56:40,030 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-14 05:56:40,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 16 conjunts are in the unsatisfiable core [2022-07-14 05:56:40,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:56:46,290 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-14 05:56:46,310 INFO L356 Elim1Store]: treesize reduction 24, result has 46.7 percent of original size [2022-07-14 05:56:46,311 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 05:56:46,319 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 05:56:46,320 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:56:46,689 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1283909361] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:56:46,689 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:56:46,689 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2022-07-14 05:56:46,690 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467208556] [2022-07-14 05:56:46,690 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:56:46,690 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-14 05:56:46,690 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:56:46,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-14 05:56:46,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=125, Unknown=5, NotChecked=0, Total=182 [2022-07-14 05:56:46,690 INFO L87 Difference]: Start difference. First operand 275 states and 355 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 05:56:55,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:56:55,137 INFO L93 Difference]: Finished difference Result 294 states and 380 transitions. [2022-07-14 05:56:55,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-07-14 05:56:55,137 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 05:56:55,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:56:55,138 INFO L225 Difference]: With dead ends: 294 [2022-07-14 05:56:55,138 INFO L226 Difference]: Without dead ends: 292 [2022-07-14 05:56:55,139 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 100 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 20.7s TimeCoverageRelationStatistics Valid=87, Invalid=180, Unknown=5, NotChecked=0, Total=272 [2022-07-14 05:56:55,139 INFO L413 NwaCegarLoop]: 193 mSDtfsCounter, 14 mSDsluCounter, 395 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 588 SdHoareTripleChecker+Invalid, 475 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 409 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-14 05:56:55,139 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 588 Invalid, 475 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 64 Invalid, 0 Unknown, 409 Unchecked, 0.2s Time] [2022-07-14 05:56:55,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2022-07-14 05:56:55,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 289. [2022-07-14 05:56:55,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 175 states have (on average 1.4114285714285715) internal successors, (247), 227 states have internal predecessors, (247), 38 states have call successors, (38), 16 states have call predecessors, (38), 25 states have return successors, (90), 45 states have call predecessors, (90), 38 states have call successors, (90) [2022-07-14 05:56:55,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 375 transitions. [2022-07-14 05:56:55,145 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 375 transitions. Word has length 55 [2022-07-14 05:56:55,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:56:55,145 INFO L495 AbstractCegarLoop]: Abstraction has 289 states and 375 transitions. [2022-07-14 05:56:55,145 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 05:56:55,145 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 375 transitions. [2022-07-14 05:56:55,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-07-14 05:56:55,146 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:56:55,146 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 05:56:55,166 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 05:56:55,359 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 05:56:55,546 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 05:56:55,547 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting nondet_treeErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 52 more)] === [2022-07-14 05:56:55,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:56:55,547 INFO L85 PathProgramCache]: Analyzing trace with hash -189298011, now seen corresponding path program 2 times [2022-07-14 05:56:55,547 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:56:55,547 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1853245476] [2022-07-14 05:56:55,547 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-14 05:56:55,547 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:56:55,547 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:56:55,548 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 05:56:55,549 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 05:56:55,739 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-14 05:56:55,739 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-14 05:56:55,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 22 conjunts are in the unsatisfiable core [2022-07-14 05:56:55,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:56:55,753 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 05:56:55,757 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 05:56:59,962 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-14 05:56:59,985 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-07-14 05:56:59,985 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 05:56:59,996 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-14 05:56:59,996 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 05:57:00,037 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 05:57:00,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:57:14,544 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:57:14,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1853245476] [2022-07-14 05:57:14,544 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1853245476] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:57:14,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1446835128] [2022-07-14 05:57:14,545 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-14 05:57:14,545 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-14 05:57:14,545 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-14 05:57:14,546 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 05:57:14,547 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 05:57:14,796 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-14 05:57:14,796 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-14 05:57:14,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 22 conjunts are in the unsatisfiable core [2022-07-14 05:57:14,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:57:14,812 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 05:57:14,817 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 05:57:16,980 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-14 05:57:17,002 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-07-14 05:57:17,002 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 05:57:17,013 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-14 05:57:17,013 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 05:57:17,023 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 05:57:17,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:57:33,610 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1446835128] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:57:33,611 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:57:33,611 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2022-07-14 05:57:33,611 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964375248] [2022-07-14 05:57:33,611 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:57:33,611 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-07-14 05:57:33,611 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:57:33,612 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-07-14 05:57:33,612 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=90, Unknown=14, NotChecked=0, Total=132 [2022-07-14 05:57:33,612 INFO L87 Difference]: Start difference. First operand 289 states and 375 transitions. Second operand has 9 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 5 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2022-07-14 05:57:40,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:57:40,286 INFO L93 Difference]: Finished difference Result 315 states and 420 transitions. [2022-07-14 05:57:40,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-07-14 05:57:40,286 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 5 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 39 [2022-07-14 05:57:40,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:57:40,288 INFO L225 Difference]: With dead ends: 315 [2022-07-14 05:57:40,288 INFO L226 Difference]: Without dead ends: 315 [2022-07-14 05:57:40,288 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 70 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 43.1s TimeCoverageRelationStatistics Valid=59, Invalid=135, Unknown=16, NotChecked=0, Total=210 [2022-07-14 05:57:40,288 INFO L413 NwaCegarLoop]: 141 mSDtfsCounter, 90 mSDsluCounter, 311 mSDsCounter, 0 mSdLazyCounter, 397 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 452 SdHoareTripleChecker+Invalid, 917 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 397 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 495 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-07-14 05:57:40,288 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [96 Valid, 452 Invalid, 917 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 397 Invalid, 0 Unknown, 495 Unchecked, 0.5s Time] [2022-07-14 05:57:40,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2022-07-14 05:57:40,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 315. [2022-07-14 05:57:40,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 315 states, 193 states have (on average 1.378238341968912) internal successors, (266), 247 states have internal predecessors, (266), 42 states have call successors, (42), 18 states have call predecessors, (42), 29 states have return successors, (112), 49 states have call predecessors, (112), 42 states have call successors, (112) [2022-07-14 05:57:40,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 420 transitions. [2022-07-14 05:57:40,295 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 420 transitions. Word has length 39 [2022-07-14 05:57:40,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:57:40,295 INFO L495 AbstractCegarLoop]: Abstraction has 315 states and 420 transitions. [2022-07-14 05:57:40,295 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 5 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2022-07-14 05:57:40,295 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 420 transitions. [2022-07-14 05:57:40,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-07-14 05:57:40,296 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:57:40,296 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 05:57:40,313 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (30)] Ended with exit code 0 [2022-07-14 05:57:40,510 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 05:57:40,708 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 05:57:40,708 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting minErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 52 more)] === [2022-07-14 05:57:40,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:57:40,708 INFO L85 PathProgramCache]: Analyzing trace with hash -1322566655, now seen corresponding path program 1 times [2022-07-14 05:57:40,709 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:57:40,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1377237444] [2022-07-14 05:57:40,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-14 05:57:40,709 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:57:40,709 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:57:40,710 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 05:57:40,710 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 05:57:40,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-14 05:57:40,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 29 conjunts are in the unsatisfiable core [2022-07-14 05:57:40,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:57:40,855 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 05:57:40,860 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 05:57:41,114 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 05:57:41,118 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 05:57:41,215 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 05:57:41,215 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:57:41,463 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 05:57:41,464 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:57:41,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1377237444] [2022-07-14 05:57:41,464 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1377237444] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-14 05:57:41,464 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:57:41,464 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 14 [2022-07-14 05:57:41,464 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278535007] [2022-07-14 05:57:41,464 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:57:41,464 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-07-14 05:57:41,464 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:57:41,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-07-14 05:57:41,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2022-07-14 05:57:41,465 INFO L87 Difference]: Start difference. First operand 315 states and 420 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 05:57:41,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:57:41,907 INFO L93 Difference]: Finished difference Result 368 states and 503 transitions. [2022-07-14 05:57:41,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-07-14 05:57:41,908 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 05:57:41,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:57:41,909 INFO L225 Difference]: With dead ends: 368 [2022-07-14 05:57:41,909 INFO L226 Difference]: Without dead ends: 368 [2022-07-14 05:57:41,910 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 05:57:41,910 INFO L413 NwaCegarLoop]: 197 mSDtfsCounter, 57 mSDsluCounter, 1354 mSDsCounter, 0 mSdLazyCounter, 202 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 1551 SdHoareTripleChecker+Invalid, 269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 59 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-14 05:57:41,910 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 1551 Invalid, 269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 202 Invalid, 0 Unknown, 59 Unchecked, 0.3s Time] [2022-07-14 05:57:41,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 368 states. [2022-07-14 05:57:41,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 368 to 349. [2022-07-14 05:57:41,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 219 states have (on average 1.3835616438356164) internal successors, (303), 272 states have internal predecessors, (303), 47 states have call successors, (47), 21 states have call predecessors, (47), 32 states have return successors, (135), 55 states have call predecessors, (135), 47 states have call successors, (135) [2022-07-14 05:57:41,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 485 transitions. [2022-07-14 05:57:41,918 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 485 transitions. Word has length 38 [2022-07-14 05:57:41,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:57:41,918 INFO L495 AbstractCegarLoop]: Abstraction has 349 states and 485 transitions. [2022-07-14 05:57:41,919 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 05:57:41,919 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 485 transitions. [2022-07-14 05:57:41,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-07-14 05:57:41,919 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:57:41,919 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 05:57:41,926 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 05:57:42,126 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 05:57:42,126 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting minErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 52 more)] === [2022-07-14 05:57:42,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:57:42,127 INFO L85 PathProgramCache]: Analyzing trace with hash -1786565566, now seen corresponding path program 2 times [2022-07-14 05:57:42,127 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:57:42,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [161904611] [2022-07-14 05:57:42,127 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-14 05:57:42,127 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:57:42,127 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:57:42,128 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 05:57:42,129 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 05:57:42,267 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-14 05:57:42,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-14 05:57:42,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 15 conjunts are in the unsatisfiable core [2022-07-14 05:57:42,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:57:42,380 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 05:57:42,380 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:57:42,791 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 05:57:42,904 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 05:57:42,905 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:57:42,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [161904611] [2022-07-14 05:57:42,905 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [161904611] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-14 05:57:42,905 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:57:42,905 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2022-07-14 05:57:42,905 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007450670] [2022-07-14 05:57:42,905 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:57:42,905 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-07-14 05:57:42,905 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:57:42,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-07-14 05:57:42,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=202, Unknown=0, NotChecked=0, Total=240 [2022-07-14 05:57:42,906 INFO L87 Difference]: Start difference. First operand 349 states and 485 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 05:57:45,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:57:45,291 INFO L93 Difference]: Finished difference Result 353 states and 488 transitions. [2022-07-14 05:57:45,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-07-14 05:57:45,299 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 05:57:45,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:57:45,301 INFO L225 Difference]: With dead ends: 353 [2022-07-14 05:57:45,301 INFO L226 Difference]: Without dead ends: 353 [2022-07-14 05:57:45,301 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 05:57:45,302 INFO L413 NwaCegarLoop]: 180 mSDtfsCounter, 62 mSDsluCounter, 1707 mSDsCounter, 0 mSdLazyCounter, 817 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 1887 SdHoareTripleChecker+Invalid, 834 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 817 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-07-14 05:57:45,302 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [64 Valid, 1887 Invalid, 834 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 817 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-07-14 05:57:45,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2022-07-14 05:57:45,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 349. [2022-07-14 05:57:45,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 219 states have (on average 1.356164383561644) internal successors, (297), 272 states have internal predecessors, (297), 47 states have call successors, (47), 21 states have call predecessors, (47), 32 states have return successors, (135), 55 states have call predecessors, (135), 47 states have call successors, (135) [2022-07-14 05:57:45,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 479 transitions. [2022-07-14 05:57:45,309 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 479 transitions. Word has length 39 [2022-07-14 05:57:45,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:57:45,310 INFO L495 AbstractCegarLoop]: Abstraction has 349 states and 479 transitions. [2022-07-14 05:57:45,310 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 05:57:45,310 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 479 transitions. [2022-07-14 05:57:45,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-07-14 05:57:45,312 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:57:45,312 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 05:57:45,319 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2022-07-14 05:57:45,519 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 05:57:45,519 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 52 more)] === [2022-07-14 05:57:45,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:57:45,520 INFO L85 PathProgramCache]: Analyzing trace with hash 922220500, now seen corresponding path program 3 times [2022-07-14 05:57:45,520 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:57:45,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [97339590] [2022-07-14 05:57:45,520 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-14 05:57:45,520 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:57:45,520 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:57:45,521 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 05:57:45,522 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 05:57:45,774 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-07-14 05:57:45,774 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-14 05:57:45,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 17 conjunts are in the unsatisfiable core [2022-07-14 05:57:45,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:57:45,790 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 05:57:52,050 INFO L356 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2022-07-14 05:57:52,051 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 05:57:52,134 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 33 proven. 28 refuted. 2 times theorem prover too weak. 22 trivial. 0 not checked. [2022-07-14 05:57:52,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:57:54,699 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:57:54,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [97339590] [2022-07-14 05:57:54,700 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [97339590] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:57:54,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [953185815] [2022-07-14 05:57:54,700 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-14 05:57:54,700 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-14 05:57:54,700 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-14 05:57:54,701 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 05:57:54,701 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 05:57:55,044 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-07-14 05:57:55,044 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-14 05:57:55,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 17 conjunts are in the unsatisfiable core [2022-07-14 05:57:55,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:58:00,512 INFO L356 Elim1Store]: treesize reduction 34, result has 38.2 percent of original size [2022-07-14 05:58:00,513 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 05:58:00,528 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 33 proven. 24 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-07-14 05:58:00,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:58:00,805 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [953185815] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:58:00,805 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:58:00,805 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2022-07-14 05:58:00,805 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1425222980] [2022-07-14 05:58:00,805 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:58:00,805 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-14 05:58:00,805 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:58:00,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-14 05:58:00,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=126, Unknown=4, NotChecked=0, Total=182 [2022-07-14 05:58:00,806 INFO L87 Difference]: Start difference. First operand 349 states and 479 transitions. Second operand has 10 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 9 states have internal predecessors, (33), 5 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) [2022-07-14 05:58:11,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-14 05:58:11,318 INFO L93 Difference]: Finished difference Result 358 states and 512 transitions. [2022-07-14 05:58:11,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-07-14 05:58:11,318 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 9 states have internal predecessors, (33), 5 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) Word has length 47 [2022-07-14 05:58:11,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-14 05:58:11,319 INFO L225 Difference]: With dead ends: 358 [2022-07-14 05:58:11,319 INFO L226 Difference]: Without dead ends: 358 [2022-07-14 05:58:11,320 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 82 SyntacticMatches, 9 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 24.2s TimeCoverageRelationStatistics Valid=94, Invalid=206, Unknown=6, NotChecked=0, Total=306 [2022-07-14 05:58:11,320 INFO L413 NwaCegarLoop]: 161 mSDtfsCounter, 94 mSDsluCounter, 406 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 567 SdHoareTripleChecker+Invalid, 1054 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 822 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-14 05:58:11,320 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 567 Invalid, 1054 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 209 Invalid, 0 Unknown, 822 Unchecked, 0.3s Time] [2022-07-14 05:58:11,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2022-07-14 05:58:11,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 350. [2022-07-14 05:58:11,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 350 states, 220 states have (on average 1.3590909090909091) internal successors, (299), 272 states have internal predecessors, (299), 47 states have call successors, (47), 21 states have call predecessors, (47), 32 states have return successors, (135), 56 states have call predecessors, (135), 47 states have call successors, (135) [2022-07-14 05:58:11,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 481 transitions. [2022-07-14 05:58:11,327 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 481 transitions. Word has length 47 [2022-07-14 05:58:11,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-14 05:58:11,328 INFO L495 AbstractCegarLoop]: Abstraction has 350 states and 481 transitions. [2022-07-14 05:58:11,328 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 9 states have internal predecessors, (33), 5 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) [2022-07-14 05:58:11,328 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 481 transitions. [2022-07-14 05:58:11,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-07-14 05:58:11,328 INFO L187 NwaCegarLoop]: Found error trace [2022-07-14 05:58:11,328 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 05:58:11,338 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 05:58:11,543 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 05:58:11,732 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 05:58:11,732 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting nondet_treeErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 52 more)] === [2022-07-14 05:58:11,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-14 05:58:11,733 INFO L85 PathProgramCache]: Analyzing trace with hash -1734674139, now seen corresponding path program 3 times [2022-07-14 05:58:11,733 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-14 05:58:11,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [965091162] [2022-07-14 05:58:11,733 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-14 05:58:11,733 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-14 05:58:11,733 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-14 05:58:11,734 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 05:58:11,734 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 05:58:11,964 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-07-14 05:58:11,964 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-14 05:58:11,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 23 conjunts are in the unsatisfiable core [2022-07-14 05:58:11,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:58:11,978 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 05:58:11,983 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 05:58:18,241 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-14 05:58:18,265 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-07-14 05:58:18,265 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 05:58:18,279 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-14 05:58:18,280 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 05:58:18,347 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 05:58:18,348 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:58:29,346 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-14 05:58:29,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [965091162] [2022-07-14 05:58:29,346 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [965091162] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:58:29,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [581502193] [2022-07-14 05:58:29,346 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-14 05:58:29,346 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-14 05:58:29,346 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-14 05:58:29,347 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 05:58:29,348 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 05:58:29,640 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-07-14 05:58:29,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-14 05:58:29,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 25 conjunts are in the unsatisfiable core [2022-07-14 05:58:29,654 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-14 05:58:29,658 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 05:58:29,662 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 05:58:37,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-14 05:58:37,948 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-07-14 05:58:37,948 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 05:58:37,958 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-14 05:58:37,958 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 05:58:37,966 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 05:58:37,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-14 05:58:59,426 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [581502193] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-14 05:58:59,427 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-14 05:58:59,427 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 11 [2022-07-14 05:58:59,427 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694933495] [2022-07-14 05:58:59,427 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-14 05:58:59,427 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-07-14 05:58:59,427 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-14 05:58:59,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-07-14 05:58:59,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=157, Unknown=16, NotChecked=0, Total=210 [2022-07-14 05:58:59,428 INFO L87 Difference]: Start difference. First operand 350 states and 481 transitions. Second operand has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 9 states have internal predecessors, (27), 4 states have call successors, (6), 3 states have call predecessors, (6), 4 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6)