./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/memsafety/test-0134.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/memsafety/test-0134.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 554aa7448188134a862651a68c0992659f18748881f2b6912b6dbf17d440798c --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:33:51,626 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:33:51,629 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:33:51,694 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:33:51,695 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:33:51,700 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:33:51,702 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:33:51,705 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:33:51,707 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:33:51,708 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:33:51,709 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:33:51,710 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:33:51,711 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:33:51,712 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:33:51,714 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:33:51,715 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:33:51,716 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:33:51,717 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:33:51,720 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:33:51,722 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:33:51,724 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:33:51,726 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:33:51,727 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:33:51,728 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:33:51,732 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:33:51,733 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:33:51,733 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:33:51,734 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:33:51,735 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:33:51,736 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:33:51,736 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:33:51,737 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:33:51,738 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:33:51,739 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:33:51,740 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:33:51,741 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:33:51,742 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:33:51,742 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:33:51,743 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:33:51,744 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:33:51,744 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:33:51,745 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-25 19:33:51,774 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:33:51,774 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:33:51,774 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:33:51,775 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:33:51,775 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:33:51,776 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:33:51,776 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:33:51,776 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:33:51,776 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:33:51,777 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 19:33:51,777 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:33:51,777 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:33:51,777 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 19:33:51,778 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 19:33:51,778 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:33:51,778 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 19:33:51,778 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 19:33:51,779 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 19:33:51,779 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-25 19:33:51,780 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-25 19:33:51,780 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:33:51,780 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:33:51,780 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-25 19:33:51,781 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:33:51,781 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:33:51,781 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:33:51,781 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-25 19:33:51,782 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-25 19:33:51,782 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-25 19:33:51,782 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:33:51,782 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-25 19:33:51,782 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:33:51,783 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:33:51,783 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:33:51,783 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:33:51,783 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:33:51,784 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:33:51,784 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:33:51,784 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 19:33:51,784 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 19:33:51,785 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:33:51,785 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:33:51,785 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 554aa7448188134a862651a68c0992659f18748881f2b6912b6dbf17d440798c [2021-11-25 19:33:52,024 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:33:52,044 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:33:52,046 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:33:52,048 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:33:52,048 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:33:52,050 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/memsafety/test-0134.i [2021-11-25 19:33:52,104 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/data/868e71b42/d40cb231b67f407a8ec5ad2d023be554/FLAG256c65d86 [2021-11-25 19:33:52,646 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:33:52,650 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/sv-benchmarks/c/memsafety/test-0134.i [2021-11-25 19:33:52,666 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/data/868e71b42/d40cb231b67f407a8ec5ad2d023be554/FLAG256c65d86 [2021-11-25 19:33:52,946 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/data/868e71b42/d40cb231b67f407a8ec5ad2d023be554 [2021-11-25 19:33:52,948 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:33:52,950 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:33:52,951 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:33:52,951 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:33:52,955 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:33:52,955 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:33:52" (1/1) ... [2021-11-25 19:33:52,956 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7f0014e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:33:52, skipping insertion in model container [2021-11-25 19:33:52,957 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:33:52" (1/1) ... [2021-11-25 19:33:52,963 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:33:53,007 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:33:53,316 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:33:53,324 ERROR L326 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2021-11-25 19:33:53,325 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@5a133fb6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:33:53, skipping insertion in model container [2021-11-25 19:33:53,325 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:33:53,326 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-25 19:33:53,327 INFO L158 Benchmark]: Toolchain (without parser) took 376.67ms. Allocated memory was 109.1MB in the beginning and 132.1MB in the end (delta: 23.1MB). Free memory was 77.0MB in the beginning and 102.0MB in the end (delta: -25.0MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2021-11-25 19:33:53,328 INFO L158 Benchmark]: CDTParser took 0.25ms. Allocated memory is still 109.1MB. Free memory is still 62.7MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-25 19:33:53,329 INFO L158 Benchmark]: CACSL2BoogieTranslator took 374.24ms. Allocated memory was 109.1MB in the beginning and 132.1MB in the end (delta: 23.1MB). Free memory was 76.7MB in the beginning and 102.0MB in the end (delta: -25.3MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2021-11-25 19:33:53,331 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25ms. Allocated memory is still 109.1MB. Free memory is still 62.7MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 374.24ms. Allocated memory was 109.1MB in the beginning and 132.1MB in the end (delta: 23.1MB). Free memory was 76.7MB in the beginning and 102.0MB in the end (delta: -25.3MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 585]: Unsupported Syntax Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/memsafety/test-0134.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 554aa7448188134a862651a68c0992659f18748881f2b6912b6dbf17d440798c --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:33:55,435 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:33:55,437 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:33:55,470 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:33:55,471 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:33:55,472 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:33:55,474 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:33:55,476 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:33:55,478 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:33:55,479 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:33:55,481 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:33:55,482 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:33:55,482 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:33:55,484 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:33:55,485 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:33:55,487 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:33:55,488 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:33:55,489 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:33:55,491 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:33:55,494 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:33:55,496 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:33:55,497 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:33:55,498 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:33:55,499 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:33:55,503 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:33:55,504 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:33:55,504 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:33:55,505 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:33:55,506 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:33:55,507 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:33:55,507 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:33:55,508 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:33:55,509 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:33:55,510 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:33:55,511 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:33:55,512 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:33:55,523 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:33:55,524 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:33:55,525 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:33:55,526 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:33:55,527 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:33:55,529 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf [2021-11-25 19:33:55,578 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:33:55,578 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:33:55,578 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:33:55,579 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:33:55,579 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:33:55,580 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:33:55,580 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:33:55,580 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:33:55,580 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:33:55,581 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:33:55,581 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:33:55,581 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:33:55,582 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-25 19:33:55,582 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-25 19:33:55,582 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:33:55,583 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:33:55,583 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-25 19:33:55,583 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:33:55,583 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:33:55,584 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:33:55,584 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-25 19:33:55,586 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-25 19:33:55,587 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-25 19:33:55,587 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:33:55,587 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-25 19:33:55,588 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-25 19:33:55,588 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-25 19:33:55,588 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:33:55,589 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:33:55,589 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:33:55,590 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-25 19:33:55,590 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:33:55,590 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:33:55,591 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:33:55,591 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:33:55,591 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-25 19:33:55,593 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-25 19:33:55,593 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:33:55,593 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:33:55,593 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:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 554aa7448188134a862651a68c0992659f18748881f2b6912b6dbf17d440798c [2021-11-25 19:33:55,968 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:33:55,993 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:33:55,996 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:33:55,997 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:33:55,998 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:33:56,000 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/memsafety/test-0134.i [2021-11-25 19:33:56,079 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/data/0614f09a1/0d865771fa7e48d89d95fb2e77cae7cc/FLAG892e34a99 [2021-11-25 19:33:56,688 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:33:56,689 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/sv-benchmarks/c/memsafety/test-0134.i [2021-11-25 19:33:56,715 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/data/0614f09a1/0d865771fa7e48d89d95fb2e77cae7cc/FLAG892e34a99 [2021-11-25 19:33:56,992 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/data/0614f09a1/0d865771fa7e48d89d95fb2e77cae7cc [2021-11-25 19:33:56,995 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:33:56,999 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:33:57,000 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:33:57,000 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:33:57,004 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:33:57,004 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:33:56" (1/1) ... [2021-11-25 19:33:57,005 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1ab85e9a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:33:57, skipping insertion in model container [2021-11-25 19:33:57,006 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:33:56" (1/1) ... [2021-11-25 19:33:57,012 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:33:57,054 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:33:57,446 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:33:57,463 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-25 19:33:57,481 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:33:57,545 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:33:57,553 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:33:57,608 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:33:57,668 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:33:57,668 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:33:57 WrapperNode [2021-11-25 19:33:57,668 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:33:57,671 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:33:57,671 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:33:57,671 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:33:57,679 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:33:57" (1/1) ... [2021-11-25 19:33:57,716 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:33:57" (1/1) ... [2021-11-25 19:33:57,768 INFO L137 Inliner]: procedures = 140, calls = 54, calls flagged for inlining = 10, calls inlined = 10, statements flattened = 133 [2021-11-25 19:33:57,768 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:33:57,770 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:33:57,770 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:33:57,770 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:33:57,778 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:33:57" (1/1) ... [2021-11-25 19:33:57,779 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:33:57" (1/1) ... [2021-11-25 19:33:57,795 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:33:57" (1/1) ... [2021-11-25 19:33:57,797 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:33:57" (1/1) ... [2021-11-25 19:33:57,813 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:33:57" (1/1) ... [2021-11-25 19:33:57,826 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:33:57" (1/1) ... [2021-11-25 19:33:57,834 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:33:57" (1/1) ... [2021-11-25 19:33:57,840 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:33:57,847 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:33:57,848 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:33:57,848 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:33:57,849 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:33:57" (1/1) ... [2021-11-25 19:33:57,856 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:33:57,866 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:33:57,882 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:33:57,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:33:57,927 INFO L130 BoogieDeclarations]: Found specification of procedure list_empty [2021-11-25 19:33:57,927 INFO L138 BoogieDeclarations]: Found implementation of procedure list_empty [2021-11-25 19:33:57,929 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-11-25 19:33:57,929 INFO L130 BoogieDeclarations]: Found specification of procedure __list_del [2021-11-25 19:33:57,929 INFO L138 BoogieDeclarations]: Found implementation of procedure __list_del [2021-11-25 19:33:57,930 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-25 19:33:57,930 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 19:33:57,930 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 19:33:57,930 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-25 19:33:57,930 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-25 19:33:57,931 INFO L130 BoogieDeclarations]: Found specification of procedure list_add [2021-11-25 19:33:57,931 INFO L138 BoogieDeclarations]: Found implementation of procedure list_add [2021-11-25 19:33:57,931 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 19:33:57,931 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-11-25 19:33:57,931 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-25 19:33:57,931 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-25 19:33:57,932 INFO L130 BoogieDeclarations]: Found specification of procedure val_from_node [2021-11-25 19:33:57,932 INFO L138 BoogieDeclarations]: Found implementation of procedure val_from_node [2021-11-25 19:33:57,932 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:33:57,932 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:33:58,092 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:33:58,093 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:33:58,617 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:33:58,625 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:33:58,626 INFO L301 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-25 19:33:58,627 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:33:58 BoogieIcfgContainer [2021-11-25 19:33:58,628 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:33:58,629 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:33:58,629 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:33:58,632 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:33:58,632 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:33:56" (1/3) ... [2021-11-25 19:33:58,633 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a98b467 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:33:58, skipping insertion in model container [2021-11-25 19:33:58,633 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:33:57" (2/3) ... [2021-11-25 19:33:58,633 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a98b467 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:33:58, skipping insertion in model container [2021-11-25 19:33:58,633 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:33:58" (3/3) ... [2021-11-25 19:33:58,635 INFO L111 eAbstractionObserver]: Analyzing ICFG test-0134.i [2021-11-25 19:33:58,640 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:33:58,640 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 48 error locations. [2021-11-25 19:33:58,683 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:33:58,689 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 19:33:58,689 INFO L340 AbstractCegarLoop]: Starting to check reachability of 48 error locations. [2021-11-25 19:33:58,711 INFO L276 IsEmpty]: Start isEmpty. Operand has 131 states, 69 states have (on average 1.8695652173913044) internal successors, (129), 117 states have internal predecessors, (129), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 19:33:58,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-25 19:33:58,720 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:33:58,720 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-25 19:33:58,721 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:33:58,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:33:58,730 INFO L85 PathProgramCache]: Analyzing trace with hash 66866992, now seen corresponding path program 1 times [2021-11-25 19:33:58,742 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:33:58,743 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1263830252] [2021-11-25 19:33:58,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:33:58,745 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:33:58,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:33:58,752 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:33:58,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-25 19:33:58,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:33:58,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-25 19:33:58,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:33:58,926 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:33:58,926 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:33:58,927 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:33:58,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1263830252] [2021-11-25 19:33:58,928 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1263830252] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:33:58,928 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:33:58,928 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:33:58,930 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907694081] [2021-11-25 19:33:58,930 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:33:58,934 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-25 19:33:58,934 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:33:58,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-25 19:33:58,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 19:33:58,964 INFO L87 Difference]: Start difference. First operand has 131 states, 69 states have (on average 1.8695652173913044) internal successors, (129), 117 states have internal predecessors, (129), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:33:58,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:33:58,988 INFO L93 Difference]: Finished difference Result 131 states and 142 transitions. [2021-11-25 19:33:58,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-25 19:33:58,991 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-25 19:33:58,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:33:58,999 INFO L225 Difference]: With dead ends: 131 [2021-11-25 19:33:59,000 INFO L226 Difference]: Without dead ends: 129 [2021-11-25 19:33:59,001 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 19:33:59,005 INFO L933 BasicCegarLoop]: 142 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 142 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:33:59,006 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 142 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:33:59,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-11-25 19:33:59,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2021-11-25 19:33:59,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 68 states have (on average 1.7941176470588236) internal successors, (122), 115 states have internal predecessors, (122), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 19:33:59,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 140 transitions. [2021-11-25 19:33:59,053 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 140 transitions. Word has length 5 [2021-11-25 19:33:59,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:33:59,053 INFO L470 AbstractCegarLoop]: Abstraction has 129 states and 140 transitions. [2021-11-25 19:33:59,054 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:33:59,054 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 140 transitions. [2021-11-25 19:33:59,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-25 19:33:59,054 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:33:59,055 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-25 19:33:59,065 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-25 19:33:59,265 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:33:59,265 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:33:59,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:33:59,266 INFO L85 PathProgramCache]: Analyzing trace with hash 66867054, now seen corresponding path program 1 times [2021-11-25 19:33:59,267 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:33:59,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [873481492] [2021-11-25 19:33:59,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:33:59,267 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:33:59,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:33:59,271 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:33:59,314 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-25 19:33:59,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:33:59,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:33:59,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:33:59,437 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:33:59,457 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:33:59,458 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:33:59,458 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:33:59,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [873481492] [2021-11-25 19:33:59,460 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [873481492] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:33:59,460 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:33:59,461 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:33:59,465 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1315603894] [2021-11-25 19:33:59,466 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:33:59,472 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:33:59,473 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:33:59,474 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:33:59,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:33:59,475 INFO L87 Difference]: Start difference. First operand 129 states and 140 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:33:59,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:33:59,732 INFO L93 Difference]: Finished difference Result 151 states and 162 transitions. [2021-11-25 19:33:59,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:33:59,733 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-25 19:33:59,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:33:59,735 INFO L225 Difference]: With dead ends: 151 [2021-11-25 19:33:59,735 INFO L226 Difference]: Without dead ends: 151 [2021-11-25 19:33:59,735 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:33:59,737 INFO L933 BasicCegarLoop]: 107 mSDtfsCounter, 75 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:33:59,737 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 141 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:33:59,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-11-25 19:33:59,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 128. [2021-11-25 19:33:59,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 68 states have (on average 1.7794117647058822) internal successors, (121), 114 states have internal predecessors, (121), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 19:33:59,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 139 transitions. [2021-11-25 19:33:59,756 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 139 transitions. Word has length 5 [2021-11-25 19:33:59,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:33:59,757 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 139 transitions. [2021-11-25 19:33:59,757 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:33:59,757 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 139 transitions. [2021-11-25 19:33:59,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-25 19:33:59,758 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:33:59,758 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-25 19:33:59,775 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-25 19:33:59,968 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:33:59,969 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:33:59,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:33:59,970 INFO L85 PathProgramCache]: Analyzing trace with hash 66867055, now seen corresponding path program 1 times [2021-11-25 19:33:59,970 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:33:59,970 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1218051723] [2021-11-25 19:33:59,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:33:59,971 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:33:59,971 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:33:59,972 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:34:00,009 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-25 19:34:00,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:00,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 19:34:00,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:00,057 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:34:00,079 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:00,079 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:34:00,079 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:34:00,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1218051723] [2021-11-25 19:34:00,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1218051723] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:34:00,082 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:34:00,082 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:34:00,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1502626122] [2021-11-25 19:34:00,083 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:34:00,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:34:00,086 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:34:00,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:34:00,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:34:00,088 INFO L87 Difference]: Start difference. First operand 128 states and 139 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:34:00,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:34:00,377 INFO L93 Difference]: Finished difference Result 150 states and 161 transitions. [2021-11-25 19:34:00,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:34:00,379 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-25 19:34:00,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:34:00,380 INFO L225 Difference]: With dead ends: 150 [2021-11-25 19:34:00,381 INFO L226 Difference]: Without dead ends: 150 [2021-11-25 19:34:00,381 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:34:00,382 INFO L933 BasicCegarLoop]: 129 mSDtfsCounter, 28 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:34:00,382 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 211 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 19:34:00,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-11-25 19:34:00,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 127. [2021-11-25 19:34:00,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 68 states have (on average 1.7647058823529411) internal successors, (120), 113 states have internal predecessors, (120), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 19:34:00,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 138 transitions. [2021-11-25 19:34:00,398 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 138 transitions. Word has length 5 [2021-11-25 19:34:00,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:34:00,398 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 138 transitions. [2021-11-25 19:34:00,398 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:34:00,398 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 138 transitions. [2021-11-25 19:34:00,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 19:34:00,399 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:34:00,399 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:34:00,413 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-25 19:34:00,609 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:34:00,609 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting list_addErr0REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:34:00,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:34:00,610 INFO L85 PathProgramCache]: Analyzing trace with hash -828261384, now seen corresponding path program 1 times [2021-11-25 19:34:00,611 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:34:00,611 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1421320108] [2021-11-25 19:34:00,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:00,611 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:34:00,611 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:34:00,612 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:34:00,649 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-25 19:34:00,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:00,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 19:34:00,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:00,782 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-11-25 19:34:00,783 INFO L388 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 16 treesize of output 21 [2021-11-25 19:34:00,856 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:00,857 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:34:00,857 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:34:00,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1421320108] [2021-11-25 19:34:00,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1421320108] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:34:00,858 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:34:00,858 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:34:00,858 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510207798] [2021-11-25 19:34:00,858 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:34:00,858 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:34:00,859 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:34:00,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:34:00,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:34:00,860 INFO L87 Difference]: Start difference. First operand 127 states and 138 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:34:01,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:34:01,374 INFO L93 Difference]: Finished difference Result 165 states and 175 transitions. [2021-11-25 19:34:01,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:34:01,375 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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 8 [2021-11-25 19:34:01,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:34:01,377 INFO L225 Difference]: With dead ends: 165 [2021-11-25 19:34:01,377 INFO L226 Difference]: Without dead ends: 165 [2021-11-25 19:34:01,377 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:34:01,378 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 179 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 208 SdHoareTripleChecker+Invalid, 229 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:34:01,378 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [180 Valid, 208 Invalid, 229 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 225 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:34:01,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-11-25 19:34:01,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 142. [2021-11-25 19:34:01,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 83 states have (on average 1.783132530120482) internal successors, (148), 127 states have internal predecessors, (148), 9 states have call successors, (9), 5 states have call predecessors, (9), 5 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 19:34:01,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 166 transitions. [2021-11-25 19:34:01,406 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 166 transitions. Word has length 8 [2021-11-25 19:34:01,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:34:01,408 INFO L470 AbstractCegarLoop]: Abstraction has 142 states and 166 transitions. [2021-11-25 19:34:01,408 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:34:01,408 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 166 transitions. [2021-11-25 19:34:01,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 19:34:01,409 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:34:01,409 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:34:01,418 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-25 19:34:01,609 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:34:01,609 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting list_addErr1REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:34:01,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:34:01,610 INFO L85 PathProgramCache]: Analyzing trace with hash -828261383, now seen corresponding path program 1 times [2021-11-25 19:34:01,610 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:34:01,610 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [510549202] [2021-11-25 19:34:01,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:01,611 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:34:01,611 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:34:01,612 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:34:01,613 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-25 19:34:01,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:01,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 19:34:01,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:01,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:34:01,824 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-11-25 19:34:01,920 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:01,922 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:34:01,922 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:34:01,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [510549202] [2021-11-25 19:34:01,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [510549202] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:34:01,923 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:34:01,923 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:34:01,923 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1385604056] [2021-11-25 19:34:01,923 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:34:01,924 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:34:01,924 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:34:01,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:34:01,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:34:01,925 INFO L87 Difference]: Start difference. First operand 142 states and 166 transitions. Second operand has 6 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:34:02,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:34:02,499 INFO L93 Difference]: Finished difference Result 146 states and 159 transitions. [2021-11-25 19:34:02,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:34:02,500 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 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 8 [2021-11-25 19:34:02,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:34:02,501 INFO L225 Difference]: With dead ends: 146 [2021-11-25 19:34:02,501 INFO L226 Difference]: Without dead ends: 146 [2021-11-25 19:34:02,501 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:34:02,502 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 302 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 256 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 303 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 286 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 256 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:34:02,503 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [303 Valid, 146 Invalid, 286 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 256 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:34:02,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-11-25 19:34:02,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 134. [2021-11-25 19:34:02,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 79 states have (on average 1.6962025316455696) internal successors, (134), 119 states have internal predecessors, (134), 9 states have call successors, (9), 5 states have call predecessors, (9), 5 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 19:34:02,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 152 transitions. [2021-11-25 19:34:02,516 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 152 transitions. Word has length 8 [2021-11-25 19:34:02,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:34:02,517 INFO L470 AbstractCegarLoop]: Abstraction has 134 states and 152 transitions. [2021-11-25 19:34:02,517 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:34:02,517 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 152 transitions. [2021-11-25 19:34:02,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 19:34:02,518 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:34:02,518 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:34:02,533 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-25 19:34:02,730 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:34:02,730 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting list_addErr2REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:34:02,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:34:02,730 INFO L85 PathProgramCache]: Analyzing trace with hash -1390240455, now seen corresponding path program 1 times [2021-11-25 19:34:02,731 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:34:02,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1771256173] [2021-11-25 19:34:02,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:02,731 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:34:02,731 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:34:02,732 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:34:02,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-25 19:34:02,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:02,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 19:34:02,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:02,943 INFO L354 Elim1Store]: treesize reduction 13, result has 23.5 percent of original size [2021-11-25 19:34:02,943 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 22 [2021-11-25 19:34:03,023 INFO L388 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 14 treesize of output 16 [2021-11-25 19:34:03,127 INFO L388 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 15 treesize of output 7 [2021-11-25 19:34:03,176 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:03,177 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:34:03,177 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:34:03,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1771256173] [2021-11-25 19:34:03,177 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1771256173] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:34:03,178 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:34:03,178 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-25 19:34:03,178 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564153284] [2021-11-25 19:34:03,178 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:34:03,178 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 19:34:03,179 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:34:03,179 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 19:34:03,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:34:03,180 INFO L87 Difference]: Start difference. First operand 134 states and 152 transitions. Second operand has 9 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:34:03,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:34:03,801 INFO L93 Difference]: Finished difference Result 155 states and 173 transitions. [2021-11-25 19:34:03,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 19:34:03,802 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 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 10 [2021-11-25 19:34:03,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:34:03,804 INFO L225 Difference]: With dead ends: 155 [2021-11-25 19:34:03,804 INFO L226 Difference]: Without dead ends: 155 [2021-11-25 19:34:03,804 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2021-11-25 19:34:03,806 INFO L933 BasicCegarLoop]: 118 mSDtfsCounter, 36 mSDsluCounter, 538 mSDsCounter, 0 mSdLazyCounter, 285 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 656 SdHoareTripleChecker+Invalid, 292 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 285 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:34:03,807 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 656 Invalid, 292 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 285 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:34:03,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-11-25 19:34:03,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 148. [2021-11-25 19:34:03,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 91 states have (on average 1.6813186813186813) internal successors, (153), 132 states have internal predecessors, (153), 10 states have call successors, (10), 6 states have call predecessors, (10), 6 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 19:34:03,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 173 transitions. [2021-11-25 19:34:03,815 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 173 transitions. Word has length 10 [2021-11-25 19:34:03,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:34:03,816 INFO L470 AbstractCegarLoop]: Abstraction has 148 states and 173 transitions. [2021-11-25 19:34:03,816 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:34:03,816 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 173 transitions. [2021-11-25 19:34:03,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 19:34:03,817 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:34:03,817 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:34:03,831 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (7)] Ended with exit code 0 [2021-11-25 19:34:04,027 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:34:04,028 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting list_addErr3REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:34:04,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:34:04,028 INFO L85 PathProgramCache]: Analyzing trace with hash -1390240454, now seen corresponding path program 1 times [2021-11-25 19:34:04,029 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:34:04,029 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [107674473] [2021-11-25 19:34:04,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:04,029 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:34:04,029 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:34:04,030 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:34:04,033 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-25 19:34:04,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:04,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-25 19:34:04,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:04,259 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 19:34:04,260 INFO L388 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 18 treesize of output 18 [2021-11-25 19:34:04,276 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-11-25 19:34:04,356 INFO L388 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 14 treesize of output 16 [2021-11-25 19:34:04,372 INFO L388 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 14 treesize of output 16 [2021-11-25 19:34:04,511 INFO L388 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 15 treesize of output 7 [2021-11-25 19:34:04,517 INFO L388 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 15 treesize of output 7 [2021-11-25 19:34:04,569 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:04,569 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:34:04,569 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:34:04,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [107674473] [2021-11-25 19:34:04,569 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [107674473] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:34:04,569 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:34:04,569 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-25 19:34:04,569 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991543292] [2021-11-25 19:34:04,570 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:34:04,570 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 19:34:04,570 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:34:04,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 19:34:04,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:34:04,571 INFO L87 Difference]: Start difference. First operand 148 states and 173 transitions. Second operand has 9 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:34:05,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:34:05,538 INFO L93 Difference]: Finished difference Result 154 states and 172 transitions. [2021-11-25 19:34:05,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 19:34:05,538 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 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 10 [2021-11-25 19:34:05,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:34:05,539 INFO L225 Difference]: With dead ends: 154 [2021-11-25 19:34:05,539 INFO L226 Difference]: Without dead ends: 154 [2021-11-25 19:34:05,540 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2021-11-25 19:34:05,540 INFO L933 BasicCegarLoop]: 117 mSDtfsCounter, 39 mSDsluCounter, 482 mSDsCounter, 0 mSdLazyCounter, 347 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 599 SdHoareTripleChecker+Invalid, 364 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 347 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:34:05,541 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 599 Invalid, 364 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 347 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:34:05,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-11-25 19:34:05,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 148. [2021-11-25 19:34:05,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 91 states have (on average 1.6703296703296704) internal successors, (152), 132 states have internal predecessors, (152), 10 states have call successors, (10), 6 states have call predecessors, (10), 6 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 19:34:05,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 172 transitions. [2021-11-25 19:34:05,549 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 172 transitions. Word has length 10 [2021-11-25 19:34:05,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:34:05,550 INFO L470 AbstractCegarLoop]: Abstraction has 148 states and 172 transitions. [2021-11-25 19:34:05,550 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:34:05,550 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 172 transitions. [2021-11-25 19:34:05,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 19:34:05,551 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:34:05,551 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:34:05,565 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-25 19:34:05,761 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:34:05,762 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting list_addErr4REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:34:05,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:34:05,762 INFO L85 PathProgramCache]: Analyzing trace with hash -147781147, now seen corresponding path program 1 times [2021-11-25 19:34:05,763 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:34:05,763 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [41409489] [2021-11-25 19:34:05,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:05,763 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:34:05,763 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:34:05,764 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:34:05,765 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-25 19:34:05,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:05,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 19:34:05,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:05,862 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:34:05,906 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:05,906 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:34:05,907 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:34:05,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [41409489] [2021-11-25 19:34:05,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [41409489] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:34:05,907 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:34:05,907 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 19:34:05,908 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176133626] [2021-11-25 19:34:05,908 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:34:05,908 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:34:05,908 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:34:05,909 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:34:05,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:34:05,909 INFO L87 Difference]: Start difference. First operand 148 states and 172 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:34:06,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:34:06,329 INFO L93 Difference]: Finished difference Result 169 states and 183 transitions. [2021-11-25 19:34:06,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 19:34:06,330 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 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 11 [2021-11-25 19:34:06,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:34:06,331 INFO L225 Difference]: With dead ends: 169 [2021-11-25 19:34:06,332 INFO L226 Difference]: Without dead ends: 169 [2021-11-25 19:34:06,332 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:34:06,333 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 113 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 291 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 301 SdHoareTripleChecker+Invalid, 295 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:34:06,333 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [122 Valid, 301 Invalid, 295 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 291 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 19:34:06,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-11-25 19:34:06,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 147. [2021-11-25 19:34:06,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 91 states have (on average 1.6153846153846154) internal successors, (147), 131 states have internal predecessors, (147), 10 states have call successors, (10), 6 states have call predecessors, (10), 6 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 19:34:06,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 167 transitions. [2021-11-25 19:34:06,340 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 167 transitions. Word has length 11 [2021-11-25 19:34:06,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:34:06,341 INFO L470 AbstractCegarLoop]: Abstraction has 147 states and 167 transitions. [2021-11-25 19:34:06,341 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:34:06,341 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 167 transitions. [2021-11-25 19:34:06,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 19:34:06,341 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:34:06,341 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:34:06,356 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-25 19:34:06,553 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:34:06,553 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting list_addErr5REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:34:06,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:34:06,554 INFO L85 PathProgramCache]: Analyzing trace with hash -147781146, now seen corresponding path program 1 times [2021-11-25 19:34:06,554 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:34:06,554 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [653532381] [2021-11-25 19:34:06,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:06,554 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:34:06,554 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:34:06,555 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:34:06,556 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-25 19:34:06,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:06,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 19:34:06,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:06,650 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:34:06,760 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:06,760 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:34:06,760 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:34:06,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [653532381] [2021-11-25 19:34:06,760 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [653532381] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:34:06,761 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:34:06,761 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 19:34:06,761 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [814903103] [2021-11-25 19:34:06,761 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:34:06,761 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:34:06,761 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:34:06,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:34:06,762 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:34:06,762 INFO L87 Difference]: Start difference. First operand 147 states and 167 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:34:07,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:34:07,251 INFO L93 Difference]: Finished difference Result 169 states and 181 transitions. [2021-11-25 19:34:07,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:34:07,252 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 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 11 [2021-11-25 19:34:07,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:34:07,254 INFO L225 Difference]: With dead ends: 169 [2021-11-25 19:34:07,254 INFO L226 Difference]: Without dead ends: 169 [2021-11-25 19:34:07,254 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:34:07,255 INFO L933 BasicCegarLoop]: 115 mSDtfsCounter, 57 mSDsluCounter, 321 mSDsCounter, 0 mSdLazyCounter, 217 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 436 SdHoareTripleChecker+Invalid, 218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:34:07,255 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 436 Invalid, 218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 217 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 19:34:07,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-11-25 19:34:07,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 147. [2021-11-25 19:34:07,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 91 states have (on average 1.5714285714285714) internal successors, (143), 131 states have internal predecessors, (143), 10 states have call successors, (10), 6 states have call predecessors, (10), 6 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 19:34:07,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 163 transitions. [2021-11-25 19:34:07,261 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 163 transitions. Word has length 11 [2021-11-25 19:34:07,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:34:07,262 INFO L470 AbstractCegarLoop]: Abstraction has 147 states and 163 transitions. [2021-11-25 19:34:07,262 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:34:07,262 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 163 transitions. [2021-11-25 19:34:07,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 19:34:07,263 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:34:07,263 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:34:07,274 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-25 19:34:07,474 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:34:07,474 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting list_addErr8REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:34:07,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:34:07,475 INFO L85 PathProgramCache]: Analyzing trace with hash -283761464, now seen corresponding path program 1 times [2021-11-25 19:34:07,475 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:34:07,475 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1286387215] [2021-11-25 19:34:07,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:07,476 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:34:07,476 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:34:07,476 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:34:07,479 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-25 19:34:07,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:07,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 19:34:07,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:07,611 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:07,611 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:34:07,612 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:34:07,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1286387215] [2021-11-25 19:34:07,612 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1286387215] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:34:07,612 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:34:07,612 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:34:07,612 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959325345] [2021-11-25 19:34:07,613 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:34:07,613 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:34:07,613 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:34:07,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:34:07,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:34:07,614 INFO L87 Difference]: Start difference. First operand 147 states and 163 transitions. Second operand has 4 states, 3 states have (on average 4.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:34:07,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:34:07,785 INFO L93 Difference]: Finished difference Result 146 states and 160 transitions. [2021-11-25 19:34:07,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:34:07,785 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.0) internal successors, (12), 4 states have internal predecessors, (12), 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 13 [2021-11-25 19:34:07,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:34:07,787 INFO L225 Difference]: With dead ends: 146 [2021-11-25 19:34:07,787 INFO L226 Difference]: Without dead ends: 146 [2021-11-25 19:34:07,787 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:34:07,788 INFO L933 BasicCegarLoop]: 123 mSDtfsCounter, 22 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 269 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:34:07,788 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 269 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:34:07,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-11-25 19:34:07,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 146. [2021-11-25 19:34:07,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 91 states have (on average 1.5384615384615385) internal successors, (140), 130 states have internal predecessors, (140), 10 states have call successors, (10), 6 states have call predecessors, (10), 6 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 19:34:07,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 160 transitions. [2021-11-25 19:34:07,795 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 160 transitions. Word has length 13 [2021-11-25 19:34:07,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:34:07,795 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 160 transitions. [2021-11-25 19:34:07,795 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:34:07,795 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 160 transitions. [2021-11-25 19:34:07,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 19:34:07,796 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:34:07,796 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:34:07,821 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-25 19:34:08,007 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:34:08,007 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting list_addErr9REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:34:08,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:34:08,007 INFO L85 PathProgramCache]: Analyzing trace with hash -283761463, now seen corresponding path program 1 times [2021-11-25 19:34:08,008 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:34:08,008 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1534655863] [2021-11-25 19:34:08,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:08,008 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:34:08,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:34:08,009 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:34:08,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-25 19:34:08,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:08,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 19:34:08,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:08,218 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:08,218 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:34:08,219 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:34:08,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1534655863] [2021-11-25 19:34:08,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1534655863] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:34:08,219 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:34:08,219 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 19:34:08,219 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [552335438] [2021-11-25 19:34:08,219 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:34:08,220 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:34:08,220 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:34:08,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:34:08,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:34:08,220 INFO L87 Difference]: Start difference. First operand 146 states and 160 transitions. Second operand has 7 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:34:08,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:34:08,670 INFO L93 Difference]: Finished difference Result 148 states and 158 transitions. [2021-11-25 19:34:08,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 19:34:08,671 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 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 13 [2021-11-25 19:34:08,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:34:08,672 INFO L225 Difference]: With dead ends: 148 [2021-11-25 19:34:08,672 INFO L226 Difference]: Without dead ends: 148 [2021-11-25 19:34:08,673 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-11-25 19:34:08,674 INFO L933 BasicCegarLoop]: 115 mSDtfsCounter, 162 mSDsluCounter, 399 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 514 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:34:08,674 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [163 Valid, 514 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 140 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 19:34:08,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-11-25 19:34:08,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 146. [2021-11-25 19:34:08,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 91 states have (on average 1.5164835164835164) internal successors, (138), 130 states have internal predecessors, (138), 10 states have call successors, (10), 6 states have call predecessors, (10), 6 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 19:34:08,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 158 transitions. [2021-11-25 19:34:08,681 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 158 transitions. Word has length 13 [2021-11-25 19:34:08,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:34:08,682 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 158 transitions. [2021-11-25 19:34:08,682 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:34:08,682 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 158 transitions. [2021-11-25 19:34:08,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-25 19:34:08,683 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:34:08,684 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:34:08,693 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-25 19:34:08,892 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:34:08,892 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting list_emptyErr0REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:34:08,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:34:08,893 INFO L85 PathProgramCache]: Analyzing trace with hash -1628861501, now seen corresponding path program 1 times [2021-11-25 19:34:08,893 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:34:08,893 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2035938881] [2021-11-25 19:34:08,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:08,893 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:34:08,894 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:34:08,895 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:34:08,896 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-25 19:34:09,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:09,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 19:34:09,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:09,110 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:09,111 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:34:09,111 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:34:09,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2035938881] [2021-11-25 19:34:09,111 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2035938881] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:34:09,111 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:34:09,111 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:34:09,111 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456586044] [2021-11-25 19:34:09,111 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:34:09,112 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:34:09,112 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:34:09,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:34:09,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:34:09,113 INFO L87 Difference]: Start difference. First operand 146 states and 158 transitions. Second operand has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 19:34:09,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:34:09,599 INFO L93 Difference]: Finished difference Result 145 states and 157 transitions. [2021-11-25 19:34:09,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 19:34:09,600 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 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 22 [2021-11-25 19:34:09,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:34:09,601 INFO L225 Difference]: With dead ends: 145 [2021-11-25 19:34:09,602 INFO L226 Difference]: Without dead ends: 145 [2021-11-25 19:34:09,602 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-11-25 19:34:09,602 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 151 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 322 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:34:09,603 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [155 Valid, 294 Invalid, 322 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 19:34:09,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2021-11-25 19:34:09,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 145. [2021-11-25 19:34:09,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 91 states have (on average 1.5054945054945055) internal successors, (137), 129 states have internal predecessors, (137), 10 states have call successors, (10), 6 states have call predecessors, (10), 6 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 19:34:09,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 157 transitions. [2021-11-25 19:34:09,609 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 157 transitions. Word has length 22 [2021-11-25 19:34:09,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:34:09,610 INFO L470 AbstractCegarLoop]: Abstraction has 145 states and 157 transitions. [2021-11-25 19:34:09,610 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 19:34:09,610 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 157 transitions. [2021-11-25 19:34:09,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-25 19:34:09,611 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:34:09,611 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:34:09,625 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-25 19:34:09,821 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:34:09,821 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting list_emptyErr1REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:34:09,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:34:09,822 INFO L85 PathProgramCache]: Analyzing trace with hash -1628861500, now seen corresponding path program 1 times [2021-11-25 19:34:09,822 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:34:09,822 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [865517010] [2021-11-25 19:34:09,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:09,822 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:34:09,823 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:34:09,824 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:34:09,863 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-25 19:34:09,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:09,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 19:34:09,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:10,171 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:10,172 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:34:10,172 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:34:10,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [865517010] [2021-11-25 19:34:10,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [865517010] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:34:10,172 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:34:10,172 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:34:10,173 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1025106403] [2021-11-25 19:34:10,173 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:34:10,173 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 19:34:10,173 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:34:10,174 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 19:34:10,174 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:34:10,174 INFO L87 Difference]: Start difference. First operand 145 states and 157 transitions. Second operand has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 19:34:10,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:34:10,956 INFO L93 Difference]: Finished difference Result 144 states and 156 transitions. [2021-11-25 19:34:10,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 19:34:10,957 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 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 22 [2021-11-25 19:34:10,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:34:10,958 INFO L225 Difference]: With dead ends: 144 [2021-11-25 19:34:10,958 INFO L226 Difference]: Without dead ends: 144 [2021-11-25 19:34:10,959 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2021-11-25 19:34:10,959 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 154 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 304 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 299 SdHoareTripleChecker+Invalid, 310 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 304 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:34:10,960 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [158 Valid, 299 Invalid, 310 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 304 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 19:34:10,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-11-25 19:34:10,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 144. [2021-11-25 19:34:10,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 91 states have (on average 1.4945054945054945) internal successors, (136), 128 states have internal predecessors, (136), 10 states have call successors, (10), 6 states have call predecessors, (10), 6 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 19:34:10,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 156 transitions. [2021-11-25 19:34:10,966 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 156 transitions. Word has length 22 [2021-11-25 19:34:10,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:34:10,966 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 156 transitions. [2021-11-25 19:34:10,966 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 19:34:10,966 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 156 transitions. [2021-11-25 19:34:10,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 19:34:10,967 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:34:10,967 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:34:10,982 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-25 19:34:11,173 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:34:11,173 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting list_addErr2REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:34:11,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:34:11,173 INFO L85 PathProgramCache]: Analyzing trace with hash 508658616, now seen corresponding path program 1 times [2021-11-25 19:34:11,174 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:34:11,174 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [493228385] [2021-11-25 19:34:11,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:11,174 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:34:11,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:34:11,176 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:34:11,191 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-25 19:34:11,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:11,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-25 19:34:11,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:11,448 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:34:11,649 INFO L388 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 11 treesize of output 7 [2021-11-25 19:34:11,772 INFO L354 Elim1Store]: treesize reduction 54, result has 37.9 percent of original size [2021-11-25 19:34:11,772 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 40 treesize of output 61 [2021-11-25 19:34:11,899 INFO L388 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 31 treesize of output 31 [2021-11-25 19:34:12,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 32 treesize of output 20 [2021-11-25 19:34:12,377 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:12,377 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:34:12,691 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_344 (_ BitVec 1)) (v_ArrVal_345 (Array (_ BitVec 32) (_ BitVec 32))) (|v_ULTIMATE.start_gl_insert_~node~0#1.base_10| (_ BitVec 32))) (or (= (_ bv0 1) (bvadd (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (select (store |c_#valid| |v_ULTIMATE.start_gl_insert_~node~0#1.base_10| v_ArrVal_344) (select (select (store |c_#memory_$Pointer$.base| |v_ULTIMATE.start_gl_insert_~node~0#1.base_10| v_ArrVal_345) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|)))))))))))) (_ bv1 1))) (not (= (_ bv0 1) (bvadd (bvneg (bvneg (bvneg v_ArrVal_344))) (_ bv1 1)))) (not (= (_ bv0 1) (select |c_#valid| |v_ULTIMATE.start_gl_insert_~node~0#1.base_10|))))) is different from false [2021-11-25 19:34:13,038 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:34:13,038 INFO L388 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 36 [2021-11-25 19:34:13,044 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:34:13,047 INFO L388 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 33 treesize of output 25 [2021-11-25 19:34:13,116 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:34:13,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [493228385] [2021-11-25 19:34:13,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [493228385] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:34:13,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [654540388] [2021-11-25 19:34:13,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:13,117 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:34:13,117 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:34:13,124 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:34:13,132 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-11-25 19:34:13,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:13,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-25 19:34:13,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:13,631 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-11-25 19:34:13,631 INFO L388 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 14 treesize of output 19 [2021-11-25 19:34:14,155 INFO L388 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 11 treesize of output 7 [2021-11-25 19:34:14,432 INFO L354 Elim1Store]: treesize reduction 81, result has 35.7 percent of original size [2021-11-25 19:34:14,432 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 44 treesize of output 75 [2021-11-25 19:34:14,601 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 29 [2021-11-25 19:34:14,843 INFO L388 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 20 treesize of output 12 [2021-11-25 19:34:14,961 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:14,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:34:15,002 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_410 (Array (_ BitVec 32) (_ BitVec 32)))) (= (_ bv0 1) (bvadd (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (select |c_#valid| (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_gl_insert_~node~0#1.base| v_ArrVal_410) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|)))))))))) (_ bv1 1)))) is different from false [2021-11-25 19:34:15,029 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_gl_insert_~node~0#1.base_12| (_ BitVec 32)) (v_ArrVal_410 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_409 (_ BitVec 1))) (or (= (_ bv0 1) (bvadd (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (select (store |c_#valid| |v_ULTIMATE.start_gl_insert_~node~0#1.base_12| v_ArrVal_409) (select (select (store |c_#memory_$Pointer$.base| |v_ULTIMATE.start_gl_insert_~node~0#1.base_12| v_ArrVal_410) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|)))))))))) (_ bv1 1))) (not (= (_ bv0 1) (select |c_#valid| |v_ULTIMATE.start_gl_insert_~node~0#1.base_12|))))) is different from false [2021-11-25 19:34:15,276 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:34:15,276 INFO L388 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 36 [2021-11-25 19:34:15,281 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:34:15,284 INFO L388 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 33 treesize of output 25 [2021-11-25 19:34:17,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [654540388] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:34:17,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [536833034] [2021-11-25 19:34:17,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:17,372 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:34:17,372 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:34:17,374 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:34:17,375 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 19:34:17,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:17,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-25 19:34:17,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:17,621 INFO L388 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 11 treesize of output 7 [2021-11-25 19:34:17,724 INFO L354 Elim1Store]: treesize reduction 54, result has 37.9 percent of original size [2021-11-25 19:34:17,725 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 37 treesize of output 58 [2021-11-25 19:34:17,897 INFO L388 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 30 treesize of output 30 [2021-11-25 19:34:18,072 INFO L388 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 24 treesize of output 16 [2021-11-25 19:34:18,147 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:18,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:34:18,246 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_474 (Array (_ BitVec 32) (_ BitVec 32)))) (= (_ bv0 1) (bvadd (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (select |c_#valid| (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_gl_insert_~node~0#1.base| v_ArrVal_474) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|)))))))))))) (_ bv1 1)))) is different from false [2021-11-25 19:34:18,271 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_gl_insert_~node~0#1.base_14| (_ BitVec 32)) (v_ArrVal_474 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_473 (_ BitVec 1))) (or (= (_ bv0 1) (bvadd (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (select (store |c_#valid| |v_ULTIMATE.start_gl_insert_~node~0#1.base_14| v_ArrVal_473) (select (select (store |c_#memory_$Pointer$.base| |v_ULTIMATE.start_gl_insert_~node~0#1.base_14| v_ArrVal_474) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|)))))))))))))))) (_ bv1 1))) (not (= (_ bv0 1) (select |c_#valid| |v_ULTIMATE.start_gl_insert_~node~0#1.base_14|))))) is different from false [2021-11-25 19:34:18,502 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:34:18,502 INFO L388 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 43 [2021-11-25 19:34:18,505 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:34:18,506 INFO L388 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 40 treesize of output 32 [2021-11-25 19:34:20,564 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [536833034] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:34:20,564 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:34:20,564 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 13] total 31 [2021-11-25 19:34:20,565 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693228566] [2021-11-25 19:34:20,565 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:34:20,565 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-25 19:34:20,565 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:34:20,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-25 19:34:20,567 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=1310, Unknown=13, NotChecked=390, Total=1892 [2021-11-25 19:34:20,567 INFO L87 Difference]: Start difference. First operand 144 states and 156 transitions. Second operand has 32 states, 30 states have (on average 1.8666666666666667) internal successors, (56), 28 states have internal predecessors, (56), 5 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 19:34:22,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:34:22,760 INFO L93 Difference]: Finished difference Result 161 states and 171 transitions. [2021-11-25 19:34:22,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-25 19:34:22,761 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 30 states have (on average 1.8666666666666667) internal successors, (56), 28 states have internal predecessors, (56), 5 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 26 [2021-11-25 19:34:22,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:34:22,763 INFO L225 Difference]: With dead ends: 161 [2021-11-25 19:34:22,763 INFO L226 Difference]: Without dead ends: 161 [2021-11-25 19:34:22,765 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 58 SyntacticMatches, 8 SemanticMatches, 53 ConstructedPredicates, 5 IntricatePredicates, 0 DeprecatedPredicates, 822 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=352, Invalid=2105, Unknown=13, NotChecked=500, Total=2970 [2021-11-25 19:34:22,765 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 207 mSDsluCounter, 941 mSDsCounter, 0 mSdLazyCounter, 677 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 1014 SdHoareTripleChecker+Invalid, 1181 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 677 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 499 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:34:22,766 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [209 Valid, 1014 Invalid, 1181 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 677 Invalid, 0 Unknown, 499 Unchecked, 1.1s Time] [2021-11-25 19:34:22,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-11-25 19:34:22,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 144. [2021-11-25 19:34:22,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 91 states have (on average 1.4835164835164836) internal successors, (135), 128 states have internal predecessors, (135), 10 states have call successors, (10), 6 states have call predecessors, (10), 6 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 19:34:22,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 155 transitions. [2021-11-25 19:34:22,772 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 155 transitions. Word has length 26 [2021-11-25 19:34:22,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:34:22,772 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 155 transitions. [2021-11-25 19:34:22,773 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 30 states have (on average 1.8666666666666667) internal successors, (56), 28 states have internal predecessors, (56), 5 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 19:34:22,773 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 155 transitions. [2021-11-25 19:34:22,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 19:34:22,774 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:34:22,774 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:34:22,815 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 19:34:23,008 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (15)] Ended with exit code 0 [2021-11-25 19:34:23,203 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (16)] Forceful destruction successful, exit code 0 [2021-11-25 19:34:23,400 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 19:34:23,401 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting list_addErr3REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:34:23,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:34:23,401 INFO L85 PathProgramCache]: Analyzing trace with hash 508658617, now seen corresponding path program 1 times [2021-11-25 19:34:23,401 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:34:23,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1410699487] [2021-11-25 19:34:23,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:23,401 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:34:23,402 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:34:23,402 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:34:23,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-25 19:34:23,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:23,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-25 19:34:23,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:23,640 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:34:23,647 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:34:23,992 INFO L388 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 11 treesize of output 7 [2021-11-25 19:34:23,998 INFO L388 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 11 treesize of output 7 [2021-11-25 19:34:24,205 INFO L354 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2021-11-25 19:34:24,205 INFO L388 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 16 treesize of output 26 [2021-11-25 19:34:24,239 INFO L354 Elim1Store]: treesize reduction 20, result has 39.4 percent of original size [2021-11-25 19:34:24,240 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 36 treesize of output 38 [2021-11-25 19:34:24,319 INFO L388 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 24 treesize of output 24 [2021-11-25 19:34:24,326 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-11-25 19:34:24,432 INFO L388 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 15 treesize of output 7 [2021-11-25 19:34:24,435 INFO L388 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 17 treesize of output 9 [2021-11-25 19:34:24,501 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:24,501 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:34:24,998 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_542 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_543 (Array (_ BitVec 32) (_ BitVec 32)))) (bvule (bvadd (_ bv8 32) (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_gl_insert_~node~0#1.base| v_ArrVal_542) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|)) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_gl_insert_~node~0#1.base| v_ArrVal_543) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|)))) (forall ((v_ArrVal_542 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse0 (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_gl_insert_~node~0#1.base| v_ArrVal_542) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|))) (bvule (bvadd (_ bv4 32) .cse0) (bvadd (_ bv8 32) .cse0))))) is different from false [2021-11-25 19:34:25,965 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:34:25,965 INFO L388 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 84 treesize of output 85 [2021-11-25 19:34:25,968 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:34:25,971 INFO L388 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 82 treesize of output 74 [2021-11-25 19:34:25,984 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:34:25,984 INFO L388 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 74 treesize of output 54 [2021-11-25 19:34:25,987 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:34:25,989 INFO L388 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 45 treesize of output 29 [2021-11-25 19:34:26,185 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:34:26,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1410699487] [2021-11-25 19:34:26,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1410699487] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:34:26,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [591599089] [2021-11-25 19:34:26,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:26,186 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:34:26,186 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:34:26,187 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:34:26,192 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-25 19:34:26,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:26,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-25 19:34:26,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:26,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:34:26,711 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:34:27,470 INFO L388 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 11 treesize of output 7 [2021-11-25 19:34:27,483 INFO L388 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 11 treesize of output 7 [2021-11-25 19:34:27,907 INFO L354 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2021-11-25 19:34:27,908 INFO L388 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 16 treesize of output 26 [2021-11-25 19:34:27,937 INFO L354 Elim1Store]: treesize reduction 20, result has 39.4 percent of original size [2021-11-25 19:34:27,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 19:34:28,094 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-11-25 19:34:28,103 INFO L388 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 24 treesize of output 24 [2021-11-25 19:34:28,351 INFO L388 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 15 treesize of output 7 [2021-11-25 19:34:28,356 INFO L388 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 17 treesize of output 9 [2021-11-25 19:34:28,368 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:28,368 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:34:28,477 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_615 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_616 (Array (_ BitVec 32) (_ BitVec 32)))) (bvule (bvadd (_ bv8 32) (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_gl_insert_~node~0#1.base| v_ArrVal_616) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|)) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_gl_insert_~node~0#1.base| v_ArrVal_615) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|)))) (forall ((v_ArrVal_616 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse0 (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_gl_insert_~node~0#1.base| v_ArrVal_616) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|))) (bvule (bvadd (_ bv4 32) .cse0) (bvadd (_ bv8 32) .cse0))))) is different from false [2021-11-25 19:34:32,223 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:34:32,223 INFO L388 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 84 treesize of output 85 [2021-11-25 19:34:32,226 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:34:32,229 INFO L388 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 82 treesize of output 74 [2021-11-25 19:34:32,241 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:34:32,242 INFO L388 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 74 treesize of output 54 [2021-11-25 19:34:32,244 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:34:32,247 INFO L388 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 45 treesize of output 29 [2021-11-25 19:34:32,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [591599089] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:34:32,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1744864529] [2021-11-25 19:34:32,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:32,491 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:34:32,492 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:34:32,497 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:34:32,518 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-25 19:34:32,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:32,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-25 19:34:32,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:32,668 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:34:33,019 INFO L388 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 11 treesize of output 7 [2021-11-25 19:34:33,030 INFO L388 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 11 treesize of output 7 [2021-11-25 19:34:33,175 INFO L354 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2021-11-25 19:34:33,175 INFO L388 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 16 treesize of output 26 [2021-11-25 19:34:33,210 INFO L354 Elim1Store]: treesize reduction 20, result has 39.4 percent of original size [2021-11-25 19:34:33,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 37 [2021-11-25 19:34:33,240 INFO L388 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 24 treesize of output 24 [2021-11-25 19:34:33,254 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-11-25 19:34:33,279 INFO L388 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 15 treesize of output 7 [2021-11-25 19:34:33,282 INFO L388 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 17 treesize of output 9 [2021-11-25 19:34:33,292 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:33,292 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:34:33,388 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_687 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse0 (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_gl_insert_~node~0#1.base| v_ArrVal_687) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|))) (bvule (bvadd (_ bv4 32) .cse0) (bvadd (_ bv8 32) .cse0)))) (forall ((v_ArrVal_687 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_688 (Array (_ BitVec 32) (_ BitVec 32)))) (bvule (bvadd (_ bv8 32) (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_gl_insert_~node~0#1.base| v_ArrVal_687) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|)) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_gl_insert_~node~0#1.base| v_ArrVal_688) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|))))) is different from false [2021-11-25 19:34:36,933 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:34:36,933 INFO L388 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 84 treesize of output 85 [2021-11-25 19:34:36,935 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:34:36,937 INFO L388 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 82 treesize of output 74 [2021-11-25 19:34:36,948 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:34:36,949 INFO L388 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 74 treesize of output 54 [2021-11-25 19:34:36,952 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:34:36,954 INFO L388 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 45 treesize of output 29 [2021-11-25 19:34:37,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1744864529] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:34:37,087 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:34:37,088 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 15] total 27 [2021-11-25 19:34:37,088 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129179757] [2021-11-25 19:34:37,088 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:34:37,088 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-25 19:34:37,089 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:34:37,089 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-25 19:34:37,090 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=1245, Unknown=22, NotChecked=222, Total=1640 [2021-11-25 19:34:37,090 INFO L87 Difference]: Start difference. First operand 144 states and 155 transitions. Second operand has 28 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 19:34:38,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:34:38,817 INFO L93 Difference]: Finished difference Result 255 states and 277 transitions. [2021-11-25 19:34:38,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 19:34:38,817 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 26 [2021-11-25 19:34:38,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:34:38,819 INFO L225 Difference]: With dead ends: 255 [2021-11-25 19:34:38,819 INFO L226 Difference]: Without dead ends: 255 [2021-11-25 19:34:38,821 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 67 SyntacticMatches, 3 SemanticMatches, 45 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 534 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=247, Invalid=1635, Unknown=22, NotChecked=258, Total=2162 [2021-11-25 19:34:38,821 INFO L933 BasicCegarLoop]: 101 mSDtfsCounter, 426 mSDsluCounter, 1052 mSDsCounter, 0 mSdLazyCounter, 781 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 428 SdHoareTripleChecker+Valid, 1153 SdHoareTripleChecker+Invalid, 1702 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 781 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 876 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:34:38,822 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [428 Valid, 1153 Invalid, 1702 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 781 Invalid, 0 Unknown, 876 Unchecked, 1.2s Time] [2021-11-25 19:34:38,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2021-11-25 19:34:38,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 178. [2021-11-25 19:34:38,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 118 states have (on average 1.5847457627118644) internal successors, (187), 155 states have internal predecessors, (187), 14 states have call successors, (14), 9 states have call predecessors, (14), 9 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2021-11-25 19:34:38,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 215 transitions. [2021-11-25 19:34:38,830 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 215 transitions. Word has length 26 [2021-11-25 19:34:38,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:34:38,831 INFO L470 AbstractCegarLoop]: Abstraction has 178 states and 215 transitions. [2021-11-25 19:34:38,831 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 19:34:38,831 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 215 transitions. [2021-11-25 19:34:38,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-25 19:34:38,832 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:34:38,832 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:34:38,849 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (18)] Ended with exit code 0 [2021-11-25 19:34:39,048 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-25 19:34:39,265 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-25 19:34:39,445 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:34:39,445 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr23REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:34:39,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:34:39,445 INFO L85 PathProgramCache]: Analyzing trace with hash -961621695, now seen corresponding path program 1 times [2021-11-25 19:34:39,446 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:34:39,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1226234432] [2021-11-25 19:34:39,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:39,446 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:34:39,446 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:34:39,448 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:34:39,451 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-25 19:34:39,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:39,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-25 19:34:39,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:39,720 INFO L388 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 11 treesize of output 7 [2021-11-25 19:34:39,987 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:39,987 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:34:39,987 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:34:39,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1226234432] [2021-11-25 19:34:39,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1226234432] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:34:39,987 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:34:39,988 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-25 19:34:39,988 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837099327] [2021-11-25 19:34:39,988 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:34:39,988 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-25 19:34:39,988 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:34:39,989 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-25 19:34:39,989 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-25 19:34:39,989 INFO L87 Difference]: Start difference. First operand 178 states and 215 transitions. Second operand has 12 states, 12 states have (on average 2.25) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 19:34:40,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:34:40,795 INFO L93 Difference]: Finished difference Result 200 states and 227 transitions. [2021-11-25 19:34:40,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 19:34:40,796 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 31 [2021-11-25 19:34:40,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:34:40,798 INFO L225 Difference]: With dead ends: 200 [2021-11-25 19:34:40,798 INFO L226 Difference]: Without dead ends: 200 [2021-11-25 19:34:40,798 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=76, Invalid=266, Unknown=0, NotChecked=0, Total=342 [2021-11-25 19:34:40,799 INFO L933 BasicCegarLoop]: 93 mSDtfsCounter, 221 mSDsluCounter, 529 mSDsCounter, 0 mSdLazyCounter, 406 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 229 SdHoareTripleChecker+Valid, 622 SdHoareTripleChecker+Invalid, 432 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 406 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:34:40,799 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [229 Valid, 622 Invalid, 432 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 406 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 19:34:40,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-11-25 19:34:40,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 176. [2021-11-25 19:34:40,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 116 states have (on average 1.5862068965517242) internal successors, (184), 153 states have internal predecessors, (184), 14 states have call successors, (14), 9 states have call predecessors, (14), 9 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2021-11-25 19:34:40,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 212 transitions. [2021-11-25 19:34:40,807 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 212 transitions. Word has length 31 [2021-11-25 19:34:40,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:34:40,807 INFO L470 AbstractCegarLoop]: Abstraction has 176 states and 212 transitions. [2021-11-25 19:34:40,808 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 19:34:40,808 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 212 transitions. [2021-11-25 19:34:40,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-25 19:34:40,809 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:34:40,809 INFO L514 BasicCegarLoop]: trace histogram [2, 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:34:40,826 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-25 19:34:41,025 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:34:41,026 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:34:41,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:34:41,026 INFO L85 PathProgramCache]: Analyzing trace with hash -149006513, now seen corresponding path program 1 times [2021-11-25 19:34:41,026 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:34:41,027 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [782881964] [2021-11-25 19:34:41,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:41,027 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:34:41,027 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:34:41,028 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:34:41,029 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-25 19:34:41,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:41,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-25 19:34:41,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:41,360 INFO L388 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 11 treesize of output 7 [2021-11-25 19:34:41,703 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:34:41,704 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:34:41,704 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:34:41,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [782881964] [2021-11-25 19:34:41,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [782881964] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:34:41,704 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:34:41,704 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-25 19:34:41,704 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211696661] [2021-11-25 19:34:41,704 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:34:41,705 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-25 19:34:41,705 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:34:41,705 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-25 19:34:41,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-25 19:34:41,706 INFO L87 Difference]: Start difference. First operand 176 states and 212 transitions. Second operand has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 19:34:42,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:34:42,602 INFO L93 Difference]: Finished difference Result 200 states and 226 transitions. [2021-11-25 19:34:42,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 19:34:42,603 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 37 [2021-11-25 19:34:42,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:34:42,605 INFO L225 Difference]: With dead ends: 200 [2021-11-25 19:34:42,605 INFO L226 Difference]: Without dead ends: 200 [2021-11-25 19:34:42,605 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=76, Invalid=266, Unknown=0, NotChecked=0, Total=342 [2021-11-25 19:34:42,606 INFO L933 BasicCegarLoop]: 92 mSDtfsCounter, 217 mSDsluCounter, 554 mSDsCounter, 0 mSdLazyCounter, 454 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 225 SdHoareTripleChecker+Valid, 646 SdHoareTripleChecker+Invalid, 479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 454 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:34:42,606 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [225 Valid, 646 Invalid, 479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 454 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:34:42,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-11-25 19:34:42,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 176. [2021-11-25 19:34:42,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 116 states have (on average 1.5775862068965518) internal successors, (183), 153 states have internal predecessors, (183), 14 states have call successors, (14), 9 states have call predecessors, (14), 9 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2021-11-25 19:34:42,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 211 transitions. [2021-11-25 19:34:42,614 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 211 transitions. Word has length 37 [2021-11-25 19:34:42,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:34:42,614 INFO L470 AbstractCegarLoop]: Abstraction has 176 states and 211 transitions. [2021-11-25 19:34:42,615 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 19:34:42,615 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 211 transitions. [2021-11-25 19:34:42,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-25 19:34:42,616 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:34:42,616 INFO L514 BasicCegarLoop]: trace histogram [2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:34:42,632 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-25 19:34:42,827 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:34:42,828 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting val_from_nodeErr0REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:34:42,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:34:42,828 INFO L85 PathProgramCache]: Analyzing trace with hash -1437435270, now seen corresponding path program 1 times [2021-11-25 19:34:42,828 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:34:42,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [950080786] [2021-11-25 19:34:42,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:42,829 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:34:42,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:34:42,829 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:34:42,830 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-25 19:34:43,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:43,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-25 19:34:43,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:43,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:34:43,214 INFO L388 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 11 treesize of output 7 [2021-11-25 19:34:43,332 INFO L354 Elim1Store]: treesize reduction 27, result has 43.8 percent of original size [2021-11-25 19:34:43,332 INFO L388 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 27 treesize of output 38 [2021-11-25 19:34:43,370 INFO L388 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 22 treesize of output 14 [2021-11-25 19:34:43,433 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 19:34:43,433 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:34:43,433 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:34:43,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [950080786] [2021-11-25 19:34:43,433 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [950080786] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:34:43,434 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:34:43,434 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-25 19:34:43,434 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331949004] [2021-11-25 19:34:43,434 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:34:43,434 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-25 19:34:43,434 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:34:43,435 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-25 19:34:43,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-25 19:34:43,435 INFO L87 Difference]: Start difference. First operand 176 states and 211 transitions. Second operand has 12 states, 10 states have (on average 2.8) internal successors, (28), 10 states have internal predecessors, (28), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 19:34:44,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:34:44,180 INFO L93 Difference]: Finished difference Result 287 states and 339 transitions. [2021-11-25 19:34:44,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 19:34:44,182 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 2.8) internal successors, (28), 10 states have internal predecessors, (28), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 39 [2021-11-25 19:34:44,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:34:44,184 INFO L225 Difference]: With dead ends: 287 [2021-11-25 19:34:44,184 INFO L226 Difference]: Without dead ends: 287 [2021-11-25 19:34:44,184 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2021-11-25 19:34:44,185 INFO L933 BasicCegarLoop]: 109 mSDtfsCounter, 169 mSDsluCounter, 592 mSDsCounter, 0 mSdLazyCounter, 438 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 175 SdHoareTripleChecker+Valid, 701 SdHoareTripleChecker+Invalid, 776 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 438 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 323 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:34:44,185 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [175 Valid, 701 Invalid, 776 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 438 Invalid, 0 Unknown, 323 Unchecked, 0.6s Time] [2021-11-25 19:34:44,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2021-11-25 19:34:44,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 204. [2021-11-25 19:34:44,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 140 states have (on average 1.5928571428571427) internal successors, (223), 178 states have internal predecessors, (223), 16 states have call successors, (16), 11 states have call predecessors, (16), 11 states have return successors, (16), 14 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-25 19:34:44,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 255 transitions. [2021-11-25 19:34:44,195 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 255 transitions. Word has length 39 [2021-11-25 19:34:44,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:34:44,195 INFO L470 AbstractCegarLoop]: Abstraction has 204 states and 255 transitions. [2021-11-25 19:34:44,195 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 2.8) internal successors, (28), 10 states have internal predecessors, (28), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 19:34:44,196 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 255 transitions. [2021-11-25 19:34:44,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-25 19:34:44,197 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:34:44,197 INFO L514 BasicCegarLoop]: trace histogram [2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:34:44,214 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-25 19:34:44,413 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:34:44,413 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting val_from_nodeErr1REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:34:44,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:34:44,414 INFO L85 PathProgramCache]: Analyzing trace with hash -1437435269, now seen corresponding path program 1 times [2021-11-25 19:34:44,415 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:34:44,415 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1323373559] [2021-11-25 19:34:44,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:44,415 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:34:44,416 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:34:44,416 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:34:44,420 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-25 19:34:44,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:44,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-25 19:34:44,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:44,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:34:44,638 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:34:44,869 INFO L388 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 11 treesize of output 7 [2021-11-25 19:34:44,874 INFO L388 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 11 treesize of output 7 [2021-11-25 19:34:45,137 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-11-25 19:34:45,138 INFO L388 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 22 treesize of output 22 [2021-11-25 19:34:45,144 INFO L388 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 16 treesize of output 18 [2021-11-25 19:34:45,233 INFO L388 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 15 treesize of output 7 [2021-11-25 19:34:45,237 INFO L388 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 17 treesize of output 9 [2021-11-25 19:34:45,352 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:45,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:34:45,957 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:34:45,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1323373559] [2021-11-25 19:34:45,957 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1323373559] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:34:45,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1601585415] [2021-11-25 19:34:45,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:45,958 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:34:45,958 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:34:45,972 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:34:45,992 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-11-25 19:34:46,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:46,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 43 conjunts are in the unsatisfiable core [2021-11-25 19:34:46,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:46,532 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:34:47,064 INFO L388 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 11 treesize of output 7 [2021-11-25 19:34:47,071 INFO L388 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 11 treesize of output 7 [2021-11-25 19:34:47,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:34:47,561 INFO L388 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 16 treesize of output 18 [2021-11-25 19:34:48,123 INFO L354 Elim1Store]: treesize reduction 3, result has 75.0 percent of original size [2021-11-25 19:34:48,124 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 31 treesize of output 24 [2021-11-25 19:34:48,143 INFO L388 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 15 treesize of output 7 [2021-11-25 19:34:48,460 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:48,460 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:34:48,830 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1601585415] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:34:48,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [499050578] [2021-11-25 19:34:48,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:48,830 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:34:48,830 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:34:48,831 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:34:48,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-25 19:34:48,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:48,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-25 19:34:48,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:48,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:34:49,197 INFO L388 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 11 treesize of output 7 [2021-11-25 19:34:49,202 INFO L388 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 11 treesize of output 7 [2021-11-25 19:34:49,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:34:49,392 INFO L388 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 16 treesize of output 18 [2021-11-25 19:34:49,405 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-11-25 19:34:49,405 INFO L388 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 23 treesize of output 23 [2021-11-25 19:34:49,477 INFO L388 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 15 treesize of output 7 [2021-11-25 19:34:49,480 INFO L388 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 17 treesize of output 9 [2021-11-25 19:34:49,506 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:49,507 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:34:49,827 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [499050578] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:34:49,827 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:34:49,827 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 13] total 25 [2021-11-25 19:34:49,827 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668340665] [2021-11-25 19:34:49,828 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:34:49,828 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-25 19:34:49,828 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:34:49,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-25 19:34:49,829 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=953, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 19:34:49,829 INFO L87 Difference]: Start difference. First operand 204 states and 255 transitions. Second operand has 26 states, 23 states have (on average 2.9130434782608696) internal successors, (67), 22 states have internal predecessors, (67), 8 states have call successors, (8), 8 states have call predecessors, (8), 6 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-25 19:34:50,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:34:50,914 INFO L93 Difference]: Finished difference Result 212 states and 261 transitions. [2021-11-25 19:34:50,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 19:34:50,915 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 23 states have (on average 2.9130434782608696) internal successors, (67), 22 states have internal predecessors, (67), 8 states have call successors, (8), 8 states have call predecessors, (8), 6 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) Word has length 39 [2021-11-25 19:34:50,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:34:50,917 INFO L225 Difference]: With dead ends: 212 [2021-11-25 19:34:50,917 INFO L226 Difference]: Without dead ends: 212 [2021-11-25 19:34:50,918 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 133 SyntacticMatches, 3 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 418 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=176, Invalid=1464, Unknown=0, NotChecked=0, Total=1640 [2021-11-25 19:34:50,918 INFO L933 BasicCegarLoop]: 115 mSDtfsCounter, 35 mSDsluCounter, 1216 mSDsCounter, 0 mSdLazyCounter, 326 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 1331 SdHoareTripleChecker+Invalid, 799 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 326 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 468 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:34:50,919 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 1331 Invalid, 799 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 326 Invalid, 0 Unknown, 468 Unchecked, 0.5s Time] [2021-11-25 19:34:50,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-11-25 19:34:50,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 209. [2021-11-25 19:34:50,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 144 states have (on average 1.5694444444444444) internal successors, (226), 182 states have internal predecessors, (226), 16 states have call successors, (16), 12 states have call predecessors, (16), 12 states have return successors, (16), 14 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-25 19:34:50,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 258 transitions. [2021-11-25 19:34:50,927 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 258 transitions. Word has length 39 [2021-11-25 19:34:50,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:34:50,928 INFO L470 AbstractCegarLoop]: Abstraction has 209 states and 258 transitions. [2021-11-25 19:34:50,928 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 23 states have (on average 2.9130434782608696) internal successors, (67), 22 states have internal predecessors, (67), 8 states have call successors, (8), 8 states have call predecessors, (8), 6 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-25 19:34:50,928 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 258 transitions. [2021-11-25 19:34:50,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-25 19:34:50,929 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:34:50,929 INFO L514 BasicCegarLoop]: trace histogram [2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:34:50,954 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-25 19:34:51,149 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2021-11-25 19:34:51,366 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2021-11-25 19:34:51,545 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:34:51,546 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:34:51,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:34:51,546 INFO L85 PathProgramCache]: Analyzing trace with hash -152973645, now seen corresponding path program 1 times [2021-11-25 19:34:51,546 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:34:51,546 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [154577859] [2021-11-25 19:34:51,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:51,547 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:34:51,547 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:34:51,547 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:34:51,549 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-25 19:34:51,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:51,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-25 19:34:51,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:51,779 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:34:51,786 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:34:51,999 INFO L388 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 11 treesize of output 7 [2021-11-25 19:34:52,003 INFO L388 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 11 treesize of output 7 [2021-11-25 19:34:52,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:34:52,206 INFO L388 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 16 treesize of output 18 [2021-11-25 19:34:52,217 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-11-25 19:34:52,217 INFO L388 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 24 treesize of output 24 [2021-11-25 19:34:52,285 INFO L388 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 15 treesize of output 7 [2021-11-25 19:34:52,288 INFO L388 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 17 treesize of output 9 [2021-11-25 19:34:52,374 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:52,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:34:52,840 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:34:52,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [154577859] [2021-11-25 19:34:52,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [154577859] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:34:52,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1958745939] [2021-11-25 19:34:52,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:52,841 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:34:52,841 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:34:52,851 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:34:52,853 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-25 19:34:53,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:53,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-25 19:34:53,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:53,366 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:34:53,821 INFO L388 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 11 treesize of output 7 [2021-11-25 19:34:53,836 INFO L388 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 11 treesize of output 7 [2021-11-25 19:34:54,212 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:34:54,213 INFO L388 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 16 treesize of output 18 [2021-11-25 19:34:54,727 INFO L354 Elim1Store]: treesize reduction 3, result has 75.0 percent of original size [2021-11-25 19:34:54,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 31 treesize of output 24 [2021-11-25 19:34:54,752 INFO L388 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 15 treesize of output 7 [2021-11-25 19:34:56,305 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:56,305 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:34:58,683 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1958745939] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:34:58,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1920608638] [2021-11-25 19:34:58,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:34:58,683 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:34:58,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:34:58,684 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:34:58,686 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-25 19:34:58,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:34:58,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-25 19:34:58,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:34:58,830 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:34:59,129 INFO L388 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 11 treesize of output 7 [2021-11-25 19:34:59,138 INFO L388 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 11 treesize of output 7 [2021-11-25 19:34:59,277 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-11-25 19:34:59,277 INFO L388 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 20 treesize of output 20 [2021-11-25 19:34:59,282 INFO L388 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 16 treesize of output 18 [2021-11-25 19:34:59,356 INFO L388 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 15 treesize of output 7 [2021-11-25 19:34:59,358 INFO L388 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 17 treesize of output 9 [2021-11-25 19:34:59,422 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:34:59,422 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:34:59,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1920608638] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:34:59,774 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:34:59,774 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 12] total 23 [2021-11-25 19:34:59,774 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1935590994] [2021-11-25 19:34:59,775 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:34:59,775 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-25 19:34:59,775 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:34:59,776 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-25 19:34:59,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=700, Unknown=0, NotChecked=0, Total=812 [2021-11-25 19:34:59,776 INFO L87 Difference]: Start difference. First operand 209 states and 258 transitions. Second operand has 24 states, 23 states have (on average 3.260869565217391) internal successors, (75), 22 states have internal predecessors, (75), 8 states have call successors, (8), 8 states have call predecessors, (8), 8 states have return successors, (8), 6 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-25 19:35:01,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:01,880 INFO L93 Difference]: Finished difference Result 212 states and 260 transitions. [2021-11-25 19:35:01,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 19:35:01,880 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 3.260869565217391) internal successors, (75), 22 states have internal predecessors, (75), 8 states have call successors, (8), 8 states have call predecessors, (8), 8 states have return successors, (8), 6 states have call predecessors, (8), 8 states have call successors, (8) Word has length 44 [2021-11-25 19:35:01,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:01,882 INFO L225 Difference]: With dead ends: 212 [2021-11-25 19:35:01,882 INFO L226 Difference]: Without dead ends: 212 [2021-11-25 19:35:01,883 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 163 SyntacticMatches, 7 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 427 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=194, Invalid=1138, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 19:35:01,884 INFO L933 BasicCegarLoop]: 116 mSDtfsCounter, 62 mSDsluCounter, 713 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 829 SdHoareTripleChecker+Invalid, 475 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 266 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:01,884 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 829 Invalid, 475 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 203 Invalid, 0 Unknown, 266 Unchecked, 0.4s Time] [2021-11-25 19:35:01,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-11-25 19:35:01,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 209. [2021-11-25 19:35:01,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 144 states have (on average 1.5625) internal successors, (225), 182 states have internal predecessors, (225), 16 states have call successors, (16), 12 states have call predecessors, (16), 12 states have return successors, (16), 14 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-25 19:35:01,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 257 transitions. [2021-11-25 19:35:01,892 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 257 transitions. Word has length 44 [2021-11-25 19:35:01,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:01,892 INFO L470 AbstractCegarLoop]: Abstraction has 209 states and 257 transitions. [2021-11-25 19:35:01,892 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 3.260869565217391) internal successors, (75), 22 states have internal predecessors, (75), 8 states have call successors, (8), 8 states have call predecessors, (8), 8 states have return successors, (8), 6 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-25 19:35:01,893 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 257 transitions. [2021-11-25 19:35:01,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 19:35:01,893 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:01,894 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:35:01,907 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (27)] Ended with exit code 0 [2021-11-25 19:35:02,109 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2021-11-25 19:35:02,326 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-25 19:35:02,507 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:35:02,507 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting val_from_nodeErr0REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:35:02,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:02,507 INFO L85 PathProgramCache]: Analyzing trace with hash -410698476, now seen corresponding path program 1 times [2021-11-25 19:35:02,507 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:35:02,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1423747433] [2021-11-25 19:35:02,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:02,508 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:35:02,508 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:35:02,509 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:35:02,510 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-25 19:35:02,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:02,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-25 19:35:02,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:35:02,792 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 19:35:02,792 INFO L388 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 15 treesize of output 15 [2021-11-25 19:35:02,819 INFO L388 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 14 treesize of output 16 [2021-11-25 19:35:02,833 INFO L388 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 7 treesize of output 3 [2021-11-25 19:35:03,036 INFO L388 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 15 treesize of output 11 [2021-11-25 19:35:03,123 INFO L354 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2021-11-25 19:35:03,123 INFO L388 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 25 treesize of output 24 [2021-11-25 19:35:03,198 INFO L354 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2021-11-25 19:35:03,198 INFO L388 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 30 [2021-11-25 19:35:03,204 INFO L388 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 11 treesize of output 7 [2021-11-25 19:35:03,315 INFO L388 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 43 treesize of output 35 [2021-11-25 19:35:03,724 INFO L388 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 23 treesize of output 15 [2021-11-25 19:35:04,002 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-25 19:35:04,003 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 14 [2021-11-25 19:35:04,144 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:35:04,144 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:35:04,475 INFO L354 Elim1Store]: treesize reduction 5, result has 75.0 percent of original size [2021-11-25 19:35:04,475 INFO L388 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 33 treesize of output 32 [2021-11-25 19:35:04,636 INFO L354 Elim1Store]: treesize reduction 5, result has 75.0 percent of original size [2021-11-25 19:35:04,637 INFO L388 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 33 treesize of output 32 [2021-11-25 19:35:05,845 INFO L388 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 76 treesize of output 72 [2021-11-25 19:35:12,167 WARN L227 SmtUtils]: Spent 6.07s on a formula simplification. DAG size of input: 38 DAG size of output: 34 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 19:35:17,609 INFO L354 Elim1Store]: treesize reduction 99, result has 63.7 percent of original size [2021-11-25 19:35:17,610 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 9 new quantified variables, introduced 28 case distinctions, treesize of input 35460 treesize of output 32501 [2021-11-25 19:35:19,291 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:35:19,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1423747433] [2021-11-25 19:35:19,292 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: BigInteger out of long range [2021-11-25 19:35:19,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [858603556] [2021-11-25 19:35:19,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:19,292 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:35:19,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:35:19,293 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:35:19,328 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (31)] Waiting until timeout for monitored process [2021-11-25 19:35:19,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:19,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 64 conjunts are in the unsatisfiable core [2021-11-25 19:35:19,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:35:19,973 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 19:35:19,974 INFO L388 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 18 treesize of output 18 [2021-11-25 19:35:20,097 INFO L388 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 14 treesize of output 16 [2021-11-25 19:35:20,105 INFO L388 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 14 treesize of output 16 [2021-11-25 19:35:20,116 INFO L388 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 7 treesize of output 3 [2021-11-25 19:35:20,125 INFO L388 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 7 treesize of output 3 [2021-11-25 19:35:20,636 INFO L388 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 15 treesize of output 11 [2021-11-25 19:35:20,662 INFO L388 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 15 treesize of output 11 [2021-11-25 19:35:20,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:35:20,787 INFO L388 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 25 treesize of output 24 [2021-11-25 19:35:20,836 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:35:20,837 INFO L388 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 25 treesize of output 24 [2021-11-25 19:35:20,895 INFO L354 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2021-11-25 19:35:20,896 INFO L388 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 30 [2021-11-25 19:35:20,950 INFO L354 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2021-11-25 19:35:20,950 INFO L388 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 30 [2021-11-25 19:35:21,203 INFO L388 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 23 treesize of output 15 [2021-11-25 19:35:21,209 INFO L388 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 23 treesize of output 15 [2021-11-25 19:35:22,019 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:35:22,019 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 61 treesize of output 35 [2021-11-25 19:35:22,028 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-11-25 19:35:22,028 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 16 [2021-11-25 19:35:22,183 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 19:35:22,183 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:35:22,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [858603556] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:22,183 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:22,184 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-11-25 19:35:22,184 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251638460] [2021-11-25 19:35:22,184 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:22,184 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-25 19:35:22,184 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:35:22,184 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-25 19:35:22,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=2096, Unknown=2, NotChecked=0, Total=2256 [2021-11-25 19:35:22,185 INFO L87 Difference]: Start difference. First operand 209 states and 257 transitions. Second operand has 15 states, 15 states have (on average 2.4) internal successors, (36), 13 states have internal predecessors, (36), 4 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-25 19:35:25,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:25,667 INFO L93 Difference]: Finished difference Result 346 states and 402 transitions. [2021-11-25 19:35:25,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-25 19:35:25,668 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 13 states have internal predecessors, (36), 4 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 49 [2021-11-25 19:35:25,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:25,670 INFO L225 Difference]: With dead ends: 346 [2021-11-25 19:35:25,670 INFO L226 Difference]: Without dead ends: 346 [2021-11-25 19:35:25,672 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 88 SyntacticMatches, 1 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 818 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=372, Invalid=3786, Unknown=2, NotChecked=0, Total=4160 [2021-11-25 19:35:25,673 INFO L933 BasicCegarLoop]: 100 mSDtfsCounter, 134 mSDsluCounter, 959 mSDsCounter, 0 mSdLazyCounter, 924 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 1059 SdHoareTripleChecker+Invalid, 948 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 924 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:25,673 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [136 Valid, 1059 Invalid, 948 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 924 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-25 19:35:25,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2021-11-25 19:35:25,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 271. [2021-11-25 19:35:25,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 195 states have (on average 1.4871794871794872) internal successors, (290), 234 states have internal predecessors, (290), 22 states have call successors, (22), 17 states have call predecessors, (22), 17 states have return successors, (22), 19 states have call predecessors, (22), 22 states have call successors, (22) [2021-11-25 19:35:25,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 334 transitions. [2021-11-25 19:35:25,684 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 334 transitions. Word has length 49 [2021-11-25 19:35:25,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:25,685 INFO L470 AbstractCegarLoop]: Abstraction has 271 states and 334 transitions. [2021-11-25 19:35:25,685 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 13 states have internal predecessors, (36), 4 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-25 19:35:25,685 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 334 transitions. [2021-11-25 19:35:25,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-25 19:35:25,686 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:25,686 INFO L514 BasicCegarLoop]: trace histogram [2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:35:25,698 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (30)] Forceful destruction successful, exit code 0 [2021-11-25 19:35:25,899 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (31)] Ended with exit code 0 [2021-11-25 19:35:26,096 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 19:35:26,096 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:35:26,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:26,097 INFO L85 PathProgramCache]: Analyzing trace with hash 149019899, now seen corresponding path program 1 times [2021-11-25 19:35:26,097 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:35:26,097 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1715380885] [2021-11-25 19:35:26,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:26,097 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:35:26,098 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:35:26,098 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:35:26,105 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-25 19:35:26,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:26,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 19:35:26,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:35:26,392 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 19:35:26,392 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:35:26,393 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:35:26,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1715380885] [2021-11-25 19:35:26,393 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1715380885] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:26,393 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:26,393 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-25 19:35:26,393 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414547266] [2021-11-25 19:35:26,393 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:26,394 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 19:35:26,394 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:35:26,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 19:35:26,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:35:26,395 INFO L87 Difference]: Start difference. First operand 271 states and 334 transitions. Second operand has 8 states, 7 states have (on average 5.428571428571429) internal successors, (38), 8 states have internal predecessors, (38), 1 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-25 19:35:27,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:27,291 INFO L93 Difference]: Finished difference Result 376 states and 452 transitions. [2021-11-25 19:35:27,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 19:35:27,292 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 5.428571428571429) internal successors, (38), 8 states have internal predecessors, (38), 1 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 50 [2021-11-25 19:35:27,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:27,294 INFO L225 Difference]: With dead ends: 376 [2021-11-25 19:35:27,294 INFO L226 Difference]: Without dead ends: 376 [2021-11-25 19:35:27,295 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2021-11-25 19:35:27,295 INFO L933 BasicCegarLoop]: 144 mSDtfsCounter, 197 mSDsluCounter, 517 mSDsCounter, 0 mSdLazyCounter, 550 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 205 SdHoareTripleChecker+Valid, 661 SdHoareTripleChecker+Invalid, 588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 550 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:27,296 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [205 Valid, 661 Invalid, 588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 550 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 19:35:27,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2021-11-25 19:35:27,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 282. [2021-11-25 19:35:27,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 282 states, 207 states have (on average 1.4734299516908214) internal successors, (305), 244 states have internal predecessors, (305), 23 states have call successors, (23), 17 states have call predecessors, (23), 17 states have return successors, (23), 20 states have call predecessors, (23), 23 states have call successors, (23) [2021-11-25 19:35:27,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 351 transitions. [2021-11-25 19:35:27,308 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 351 transitions. Word has length 50 [2021-11-25 19:35:27,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:27,309 INFO L470 AbstractCegarLoop]: Abstraction has 282 states and 351 transitions. [2021-11-25 19:35:27,309 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 5.428571428571429) internal successors, (38), 8 states have internal predecessors, (38), 1 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-25 19:35:27,309 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 351 transitions. [2021-11-25 19:35:27,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-25 19:35:27,310 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:27,310 INFO L514 BasicCegarLoop]: trace histogram [2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:35:27,331 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-11-25 19:35:27,522 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:35:27,522 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:35:27,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:27,523 INFO L85 PathProgramCache]: Analyzing trace with hash 149019900, now seen corresponding path program 1 times [2021-11-25 19:35:27,523 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:35:27,523 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1797679519] [2021-11-25 19:35:27,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:27,523 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:35:27,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:35:27,524 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:35:27,525 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-25 19:35:27,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:27,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-25 19:35:27,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:35:27,795 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:35:27,809 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 19:35:27,810 INFO L388 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 19 treesize of output 19 [2021-11-25 19:35:28,127 INFO L388 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 11 treesize of output 7 [2021-11-25 19:35:28,133 INFO L388 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 11 treesize of output 7 [2021-11-25 19:35:28,548 INFO L354 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2021-11-25 19:35:28,548 INFO L388 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 1 case distinctions, treesize of input 16 treesize of output 26 [2021-11-25 19:35:28,839 INFO L388 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 15 treesize of output 7 [2021-11-25 19:35:29,170 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:35:29,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 31 [2021-11-25 19:35:29,433 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:29,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:35:30,908 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:35:30,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1797679519] [2021-11-25 19:35:30,908 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1797679519] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:35:30,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [309067993] [2021-11-25 19:35:30,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:30,909 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:35:30,909 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:35:30,911 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:35:30,912 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-25 19:35:31,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:31,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-25 19:35:31,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:35:31,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:35:32,148 INFO L388 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 11 treesize of output 7 [2021-11-25 19:35:32,153 INFO L388 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 11 treesize of output 7 [2021-11-25 19:35:32,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:35:32,657 INFO L388 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 16 treesize of output 18 [2021-11-25 19:35:33,181 INFO L354 Elim1Store]: treesize reduction 3, result has 75.0 percent of original size [2021-11-25 19:35:33,182 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 31 treesize of output 24 [2021-11-25 19:35:33,202 INFO L388 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 15 treesize of output 7 [2021-11-25 19:35:35,913 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:35,913 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:35:37,228 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [309067993] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:35:37,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1863968221] [2021-11-25 19:35:37,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:37,228 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:35:37,228 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:35:37,229 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:35:37,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-25 19:35:37,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:37,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-25 19:35:37,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:35:37,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:35:38,698 INFO L388 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 11 treesize of output 7 [2021-11-25 19:35:38,707 INFO L388 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 11 treesize of output 7 [2021-11-25 19:35:39,279 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-11-25 19:35:39,279 INFO L388 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 19 treesize of output 19 [2021-11-25 19:35:39,284 INFO L388 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 16 treesize of output 18 [2021-11-25 19:35:39,657 INFO L388 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 15 treesize of output 7 [2021-11-25 19:35:39,659 INFO L388 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 17 treesize of output 9 [2021-11-25 19:35:41,231 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:41,231 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:35:46,314 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1863968221] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:35:46,314 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:35:46,314 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 14, 15] total 47 [2021-11-25 19:35:46,315 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111802711] [2021-11-25 19:35:46,315 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:35:46,315 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-25 19:35:46,316 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:35:46,316 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-25 19:35:46,317 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=273, Invalid=3631, Unknown=2, NotChecked=0, Total=3906 [2021-11-25 19:35:46,318 INFO L87 Difference]: Start difference. First operand 282 states and 351 transitions. Second operand has 48 states, 46 states have (on average 2.739130434782609) internal successors, (126), 45 states have internal predecessors, (126), 12 states have call successors, (12), 12 states have call predecessors, (12), 12 states have return successors, (12), 9 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-25 19:35:55,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:55,822 INFO L93 Difference]: Finished difference Result 289 states and 360 transitions. [2021-11-25 19:35:55,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-25 19:35:55,825 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 46 states have (on average 2.739130434782609) internal successors, (126), 45 states have internal predecessors, (126), 12 states have call successors, (12), 12 states have call predecessors, (12), 12 states have return successors, (12), 9 states have call predecessors, (12), 12 states have call successors, (12) Word has length 50 [2021-11-25 19:35:55,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:55,827 INFO L225 Difference]: With dead ends: 289 [2021-11-25 19:35:55,827 INFO L226 Difference]: Without dead ends: 289 [2021-11-25 19:35:55,830 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 172 SyntacticMatches, 4 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2274 ImplicationChecksByTransitivity, 22.7s TimeCoverageRelationStatistics Valid=572, Invalid=7082, Unknown=2, NotChecked=0, Total=7656 [2021-11-25 19:35:55,830 INFO L933 BasicCegarLoop]: 110 mSDtfsCounter, 149 mSDsluCounter, 1098 mSDsCounter, 0 mSdLazyCounter, 262 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 1208 SdHoareTripleChecker+Invalid, 576 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 262 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 312 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:55,831 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [149 Valid, 1208 Invalid, 576 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 262 Invalid, 0 Unknown, 312 Unchecked, 0.5s Time] [2021-11-25 19:35:55,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-11-25 19:35:55,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 287. [2021-11-25 19:35:55,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 287 states, 212 states have (on average 1.4669811320754718) internal successors, (311), 249 states have internal predecessors, (311), 23 states have call successors, (23), 17 states have call predecessors, (23), 17 states have return successors, (23), 20 states have call predecessors, (23), 23 states have call successors, (23) [2021-11-25 19:35:55,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 357 transitions. [2021-11-25 19:35:55,841 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 357 transitions. Word has length 50 [2021-11-25 19:35:55,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:55,841 INFO L470 AbstractCegarLoop]: Abstraction has 287 states and 357 transitions. [2021-11-25 19:35:55,842 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 46 states have (on average 2.739130434782609) internal successors, (126), 45 states have internal predecessors, (126), 12 states have call successors, (12), 12 states have call predecessors, (12), 12 states have return successors, (12), 9 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-25 19:35:55,842 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 357 transitions. [2021-11-25 19:35:55,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-25 19:35:55,843 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:55,843 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:35:55,865 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-11-25 19:35:56,076 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2021-11-25 19:35:56,259 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (34)] Forceful destruction successful, exit code 0 [2021-11-25 19:35:56,456 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 19:35:56,457 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting list_addErr0REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:35:56,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:56,457 INFO L85 PathProgramCache]: Analyzing trace with hash 1474221072, now seen corresponding path program 1 times [2021-11-25 19:35:56,457 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:35:56,457 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [301890072] [2021-11-25 19:35:56,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:56,457 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:35:56,458 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:35:56,458 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:35:56,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-25 19:35:56,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:56,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 19:35:56,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:35:56,844 INFO L388 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 11 treesize of output 7 [2021-11-25 19:35:56,974 INFO L388 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 16 treesize of output 8 [2021-11-25 19:35:57,076 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 19:35:57,077 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:35:57,077 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:35:57,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [301890072] [2021-11-25 19:35:57,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [301890072] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:57,077 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:57,077 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-25 19:35:57,077 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1968562563] [2021-11-25 19:35:57,077 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:57,078 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 19:35:57,078 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:35:57,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 19:35:57,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2021-11-25 19:35:57,079 INFO L87 Difference]: Start difference. First operand 287 states and 357 transitions. Second operand has 11 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 11 states have internal predecessors, (39), 4 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-25 19:35:58,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:58,199 INFO L93 Difference]: Finished difference Result 348 states and 422 transitions. [2021-11-25 19:35:58,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 19:35:58,200 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 11 states have internal predecessors, (39), 4 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 52 [2021-11-25 19:35:58,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:58,202 INFO L225 Difference]: With dead ends: 348 [2021-11-25 19:35:58,202 INFO L226 Difference]: Without dead ends: 348 [2021-11-25 19:35:58,202 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=87, Invalid=375, Unknown=0, NotChecked=0, Total=462 [2021-11-25 19:35:58,203 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 265 mSDsluCounter, 900 mSDsCounter, 0 mSdLazyCounter, 413 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 273 SdHoareTripleChecker+Valid, 1024 SdHoareTripleChecker+Invalid, 444 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 413 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:58,203 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [273 Valid, 1024 Invalid, 444 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 413 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 19:35:58,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2021-11-25 19:35:58,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 287. [2021-11-25 19:35:58,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 287 states, 212 states have (on average 1.4528301886792452) internal successors, (308), 249 states have internal predecessors, (308), 23 states have call successors, (23), 17 states have call predecessors, (23), 17 states have return successors, (23), 20 states have call predecessors, (23), 23 states have call successors, (23) [2021-11-25 19:35:58,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 354 transitions. [2021-11-25 19:35:58,215 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 354 transitions. Word has length 52 [2021-11-25 19:35:58,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:58,215 INFO L470 AbstractCegarLoop]: Abstraction has 287 states and 354 transitions. [2021-11-25 19:35:58,215 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 11 states have internal predecessors, (39), 4 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-25 19:35:58,215 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 354 transitions. [2021-11-25 19:35:58,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-25 19:35:58,216 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:58,216 INFO L514 BasicCegarLoop]: trace histogram [2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:35:58,232 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-11-25 19:35:58,443 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:35:58,443 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:35:58,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:58,444 INFO L85 PathProgramCache]: Analyzing trace with hash 324649674, now seen corresponding path program 1 times [2021-11-25 19:35:58,444 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:35:58,444 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [167358084] [2021-11-25 19:35:58,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:58,444 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:35:58,444 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:35:58,445 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:35:58,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-25 19:35:58,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:58,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-25 19:35:58,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:35:58,833 INFO L388 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 11 treesize of output 7 [2021-11-25 19:35:58,938 INFO L388 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 15 treesize of output 7 [2021-11-25 19:35:59,112 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 19:35:59,112 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:35:59,112 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:35:59,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [167358084] [2021-11-25 19:35:59,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [167358084] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:59,113 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:59,113 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-11-25 19:35:59,113 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338302607] [2021-11-25 19:35:59,113 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:59,114 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 19:35:59,114 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:35:59,114 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 19:35:59,114 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2021-11-25 19:35:59,114 INFO L87 Difference]: Start difference. First operand 287 states and 354 transitions. Second operand has 13 states, 12 states have (on average 3.25) internal successors, (39), 13 states have internal predecessors, (39), 3 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-25 19:36:01,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:36:01,084 INFO L93 Difference]: Finished difference Result 387 states and 466 transitions. [2021-11-25 19:36:01,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 19:36:01,085 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 3.25) internal successors, (39), 13 states have internal predecessors, (39), 3 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 51 [2021-11-25 19:36:01,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:36:01,087 INFO L225 Difference]: With dead ends: 387 [2021-11-25 19:36:01,087 INFO L226 Difference]: Without dead ends: 387 [2021-11-25 19:36:01,088 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=130, Invalid=572, Unknown=0, NotChecked=0, Total=702 [2021-11-25 19:36:01,088 INFO L933 BasicCegarLoop]: 146 mSDtfsCounter, 379 mSDsluCounter, 1189 mSDsCounter, 0 mSdLazyCounter, 633 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 387 SdHoareTripleChecker+Valid, 1335 SdHoareTripleChecker+Invalid, 679 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 633 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:36:01,089 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [387 Valid, 1335 Invalid, 679 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 633 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2021-11-25 19:36:01,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2021-11-25 19:36:01,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 289. [2021-11-25 19:36:01,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 214 states have (on average 1.4485981308411215) internal successors, (310), 251 states have internal predecessors, (310), 23 states have call successors, (23), 17 states have call predecessors, (23), 17 states have return successors, (23), 20 states have call predecessors, (23), 23 states have call successors, (23) [2021-11-25 19:36:01,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 356 transitions. [2021-11-25 19:36:01,101 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 356 transitions. Word has length 51 [2021-11-25 19:36:01,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:36:01,102 INFO L470 AbstractCegarLoop]: Abstraction has 289 states and 356 transitions. [2021-11-25 19:36:01,102 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 3.25) internal successors, (39), 13 states have internal predecessors, (39), 3 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-25 19:36:01,102 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 356 transitions. [2021-11-25 19:36:01,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-25 19:36:01,102 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:36:01,103 INFO L514 BasicCegarLoop]: trace histogram [2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:36:01,124 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2021-11-25 19:36:01,315 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:36:01,316 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __list_delErr0REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:36:01,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:36:01,316 INFO L85 PathProgramCache]: Analyzing trace with hash -627774649, now seen corresponding path program 1 times [2021-11-25 19:36:01,317 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:36:01,317 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1908140741] [2021-11-25 19:36:01,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:01,317 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:36:01,317 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:36:01,318 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:36:01,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-11-25 19:36:01,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:01,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 19:36:01,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:36:01,824 INFO L388 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 20 treesize of output 12 [2021-11-25 19:36:01,927 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:01,927 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:36:01,927 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:36:01,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1908140741] [2021-11-25 19:36:01,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1908140741] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:36:01,927 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:36:01,927 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-11-25 19:36:01,928 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727076256] [2021-11-25 19:36:01,928 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:36:01,928 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 19:36:01,928 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:36:01,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 19:36:01,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2021-11-25 19:36:01,930 INFO L87 Difference]: Start difference. First operand 289 states and 356 transitions. Second operand has 14 states, 12 states have (on average 3.75) internal successors, (45), 13 states have internal predecessors, (45), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 19:36:04,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:36:04,544 INFO L93 Difference]: Finished difference Result 328 states and 403 transitions. [2021-11-25 19:36:04,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-25 19:36:04,545 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 3.75) internal successors, (45), 13 states have internal predecessors, (45), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 54 [2021-11-25 19:36:04,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:36:04,547 INFO L225 Difference]: With dead ends: 328 [2021-11-25 19:36:04,547 INFO L226 Difference]: Without dead ends: 328 [2021-11-25 19:36:04,547 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=158, Invalid=712, Unknown=0, NotChecked=0, Total=870 [2021-11-25 19:36:04,547 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 225 mSDsluCounter, 580 mSDsCounter, 0 mSdLazyCounter, 1040 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 229 SdHoareTripleChecker+Valid, 654 SdHoareTripleChecker+Invalid, 1059 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 1040 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:36:04,548 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [229 Valid, 654 Invalid, 1059 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 1040 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2021-11-25 19:36:04,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2021-11-25 19:36:04,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 296. [2021-11-25 19:36:04,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 296 states, 219 states have (on average 1.45662100456621) internal successors, (319), 257 states have internal predecessors, (319), 24 states have call successors, (24), 18 states have call predecessors, (24), 18 states have return successors, (24), 20 states have call predecessors, (24), 24 states have call successors, (24) [2021-11-25 19:36:04,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 367 transitions. [2021-11-25 19:36:04,558 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 367 transitions. Word has length 54 [2021-11-25 19:36:04,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:36:04,558 INFO L470 AbstractCegarLoop]: Abstraction has 296 states and 367 transitions. [2021-11-25 19:36:04,558 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 3.75) internal successors, (45), 13 states have internal predecessors, (45), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 19:36:04,558 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 367 transitions. [2021-11-25 19:36:04,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-25 19:36:04,559 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:36:04,559 INFO L514 BasicCegarLoop]: trace histogram [2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:36:04,584 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (38)] Forceful destruction successful, exit code 0 [2021-11-25 19:36:04,772 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:36:04,772 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __list_delErr1REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:36:04,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:36:04,772 INFO L85 PathProgramCache]: Analyzing trace with hash -627774648, now seen corresponding path program 1 times [2021-11-25 19:36:04,773 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:36:04,773 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [10247274] [2021-11-25 19:36:04,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:04,773 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:36:04,773 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:36:04,774 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:36:04,775 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-25 19:36:05,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:05,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-25 19:36:05,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:36:05,273 INFO L354 Elim1Store]: treesize reduction 12, result has 52.0 percent of original size [2021-11-25 19:36:05,273 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 31 treesize of output 35 [2021-11-25 19:36:05,294 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-11-25 19:36:05,923 INFO L388 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 11 treesize of output 7 [2021-11-25 19:36:06,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:36:06,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-11-25 19:36:08,097 INFO L354 Elim1Store]: treesize reduction 3, result has 81.3 percent of original size [2021-11-25 19:36:08,098 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 94 treesize of output 42 [2021-11-25 19:36:08,104 INFO L388 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 28 treesize of output 16 [2021-11-25 19:36:08,281 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:36:08,281 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:36:09,591 INFO L388 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 40 treesize of output 24 [2021-11-25 19:36:09,853 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:36:09,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [10247274] [2021-11-25 19:36:09,853 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [10247274] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:36:09,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1135993733] [2021-11-25 19:36:09,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:09,853 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:36:09,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:36:09,854 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:36:09,855 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (40)] Waiting until timeout for monitored process [2021-11-25 19:36:10,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:10,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-25 19:36:10,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:36:10,463 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:36:10,463 INFO L388 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 1 case distinctions, treesize of input 12 treesize of output 18 [2021-11-25 19:36:10,501 INFO L354 Elim1Store]: treesize reduction 12, result has 52.0 percent of original size [2021-11-25 19:36:10,502 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 33 treesize of output 37 [2021-11-25 19:36:10,978 INFO L388 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 11 treesize of output 7 [2021-11-25 19:36:11,404 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:36:11,405 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-11-25 19:36:14,158 INFO L354 Elim1Store]: treesize reduction 15, result has 6.3 percent of original size [2021-11-25 19:36:14,158 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 124 treesize of output 43 [2021-11-25 19:36:14,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 13 [2021-11-25 19:36:14,192 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:36:14,192 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:36:14,787 INFO L354 Elim1Store]: treesize reduction 14, result has 6.7 percent of original size [2021-11-25 19:36:14,788 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 96 treesize of output 44 [2021-11-25 19:36:15,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1135993733] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:36:15,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [355142050] [2021-11-25 19:36:15,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:15,353 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:36:15,354 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:36:15,355 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:36:15,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-25 19:36:15,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:15,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-25 19:36:15,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:36:15,690 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:36:15,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-11-25 19:36:16,352 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:36:16,353 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-11-25 19:36:17,335 INFO L388 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 15 treesize of output 7 [2021-11-25 19:36:17,338 INFO L388 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 15 treesize of output 7 [2021-11-25 19:36:17,361 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:36:17,361 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:36:17,503 INFO L388 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 40 treesize of output 32 [2021-11-25 19:36:17,505 INFO L388 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 36 treesize of output 20 [2021-11-25 19:36:22,646 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [355142050] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:36:22,646 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:36:22,646 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 21, 13] total 38 [2021-11-25 19:36:22,647 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [824508528] [2021-11-25 19:36:22,647 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:36:22,647 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-25 19:36:22,647 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:36:22,648 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-25 19:36:22,649 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=2812, Unknown=2, NotChecked=0, Total=3192 [2021-11-25 19:36:22,649 INFO L87 Difference]: Start difference. First operand 296 states and 367 transitions. Second operand has 40 states, 38 states have (on average 2.763157894736842) internal successors, (105), 37 states have internal predecessors, (105), 7 states have call successors, (10), 6 states have call predecessors, (10), 7 states have return successors, (10), 5 states have call predecessors, (10), 6 states have call successors, (10) [2021-11-25 19:36:26,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:36:26,305 INFO L93 Difference]: Finished difference Result 462 states and 565 transitions. [2021-11-25 19:36:26,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-25 19:36:26,307 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 38 states have (on average 2.763157894736842) internal successors, (105), 37 states have internal predecessors, (105), 7 states have call successors, (10), 6 states have call predecessors, (10), 7 states have return successors, (10), 5 states have call predecessors, (10), 6 states have call successors, (10) Word has length 54 [2021-11-25 19:36:26,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:36:26,310 INFO L225 Difference]: With dead ends: 462 [2021-11-25 19:36:26,310 INFO L226 Difference]: Without dead ends: 462 [2021-11-25 19:36:26,312 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 168 SyntacticMatches, 3 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1835 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=687, Invalid=5163, Unknown=2, NotChecked=0, Total=5852 [2021-11-25 19:36:26,313 INFO L933 BasicCegarLoop]: 83 mSDtfsCounter, 170 mSDsluCounter, 1182 mSDsCounter, 0 mSdLazyCounter, 1075 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 173 SdHoareTripleChecker+Valid, 1265 SdHoareTripleChecker+Invalid, 1934 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 1075 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 841 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:36:26,313 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [173 Valid, 1265 Invalid, 1934 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 1075 Invalid, 0 Unknown, 841 Unchecked, 1.8s Time] [2021-11-25 19:36:26,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 462 states. [2021-11-25 19:36:26,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 462 to 402. [2021-11-25 19:36:26,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 402 states, 306 states have (on average 1.5163398692810457) internal successors, (464), 348 states have internal predecessors, (464), 35 states have call successors, (35), 26 states have call predecessors, (35), 26 states have return successors, (35), 27 states have call predecessors, (35), 35 states have call successors, (35) [2021-11-25 19:36:26,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 534 transitions. [2021-11-25 19:36:26,329 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 534 transitions. Word has length 54 [2021-11-25 19:36:26,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:36:26,330 INFO L470 AbstractCegarLoop]: Abstraction has 402 states and 534 transitions. [2021-11-25 19:36:26,330 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 38 states have (on average 2.763157894736842) internal successors, (105), 37 states have internal predecessors, (105), 7 states have call successors, (10), 6 states have call predecessors, (10), 7 states have return successors, (10), 5 states have call predecessors, (10), 6 states have call successors, (10) [2021-11-25 19:36:26,330 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 534 transitions. [2021-11-25 19:36:26,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-25 19:36:26,331 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:36:26,331 INFO L514 BasicCegarLoop]: trace histogram [2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:36:26,365 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (39)] Forceful destruction successful, exit code 0 [2021-11-25 19:36:26,557 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (40)] Forceful destruction successful, exit code 0 [2021-11-25 19:36:26,792 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-25 19:36:26,960 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:36:26,960 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __list_delErr2REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:36:26,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:36:26,961 INFO L85 PathProgramCache]: Analyzing trace with hash 2013822347, now seen corresponding path program 1 times [2021-11-25 19:36:26,961 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:36:26,961 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1158957856] [2021-11-25 19:36:26,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:26,962 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:36:26,962 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:36:26,963 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:36:26,969 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-11-25 19:36:27,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:27,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-25 19:36:27,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:36:27,409 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 19:36:27,409 INFO L388 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 16 treesize of output 16 [2021-11-25 19:36:27,572 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 19:36:27,663 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 19:36:27,664 INFO L388 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 21 treesize of output 20 [2021-11-25 19:36:27,669 INFO L388 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 11 treesize of output 7 [2021-11-25 19:36:28,269 INFO L388 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 25 treesize of output 17 [2021-11-25 19:36:28,919 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-25 19:36:28,919 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 14 [2021-11-25 19:36:29,085 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:29,085 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:36:29,697 INFO L354 Elim1Store]: treesize reduction 5, result has 77.3 percent of original size [2021-11-25 19:36:29,698 INFO L388 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 38 treesize of output 37 [2021-11-25 19:36:29,914 INFO L354 Elim1Store]: treesize reduction 5, result has 77.3 percent of original size [2021-11-25 19:36:29,915 INFO L388 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 38 treesize of output 37 [2021-11-25 19:36:30,764 INFO L388 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 80 treesize of output 76 [2021-11-25 19:36:31,938 INFO L354 Elim1Store]: treesize reduction 102, result has 59.7 percent of original size [2021-11-25 19:36:31,939 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 8 new quantified variables, introduced 21 case distinctions, treesize of input 2559 treesize of output 2489 [2021-11-25 19:38:25,576 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:38:25,577 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:38:25,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1158957856] [2021-11-25 19:38:25,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1158957856] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 19:38:25,577 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:38:25,578 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [21] total 38 [2021-11-25 19:38:25,578 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220967737] [2021-11-25 19:38:25,578 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:38:25,579 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-25 19:38:25,579 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:38:25,579 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-25 19:38:25,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=1358, Unknown=0, NotChecked=0, Total=1482 [2021-11-25 19:38:25,580 INFO L87 Difference]: Start difference. First operand 402 states and 534 transitions. Second operand has 18 states, 17 states have (on average 2.7058823529411766) internal successors, (46), 17 states have internal predecessors, (46), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-25 19:38:32,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:38:32,038 INFO L93 Difference]: Finished difference Result 449 states and 566 transitions. [2021-11-25 19:38:32,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-25 19:38:32,040 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.7058823529411766) internal successors, (46), 17 states have internal predecessors, (46), 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 55 [2021-11-25 19:38:32,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:38:32,043 INFO L225 Difference]: With dead ends: 449 [2021-11-25 19:38:32,043 INFO L226 Difference]: Without dead ends: 449 [2021-11-25 19:38:32,045 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1002 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=306, Invalid=3476, Unknown=0, NotChecked=0, Total=3782 [2021-11-25 19:38:32,046 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 246 mSDsluCounter, 854 mSDsCounter, 0 mSdLazyCounter, 1359 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 248 SdHoareTripleChecker+Valid, 933 SdHoareTripleChecker+Invalid, 1517 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 1359 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 107 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:38:32,048 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [248 Valid, 933 Invalid, 1517 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 1359 Invalid, 0 Unknown, 107 Unchecked, 4.0s Time] [2021-11-25 19:38:32,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 449 states. [2021-11-25 19:38:32,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 449 to 414. [2021-11-25 19:38:32,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 414 states, 314 states have (on average 1.5095541401273886) internal successors, (474), 358 states have internal predecessors, (474), 37 states have call successors, (37), 28 states have call predecessors, (37), 28 states have return successors, (37), 27 states have call predecessors, (37), 37 states have call successors, (37) [2021-11-25 19:38:32,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 548 transitions. [2021-11-25 19:38:32,067 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 548 transitions. Word has length 55 [2021-11-25 19:38:32,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:38:32,067 INFO L470 AbstractCegarLoop]: Abstraction has 414 states and 548 transitions. [2021-11-25 19:38:32,068 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.7058823529411766) internal successors, (46), 17 states have internal predecessors, (46), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-25 19:38:32,068 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 548 transitions. [2021-11-25 19:38:32,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-25 19:38:32,069 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:38:32,069 INFO L514 BasicCegarLoop]: trace histogram [2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:38:32,088 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (42)] Forceful destruction successful, exit code 0 [2021-11-25 19:38:32,284 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:38:32,284 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting __list_delErr3REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:38:32,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:38:32,285 INFO L85 PathProgramCache]: Analyzing trace with hash 2013822348, now seen corresponding path program 1 times [2021-11-25 19:38:32,285 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:38:32,285 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [110324303] [2021-11-25 19:38:32,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:38:32,285 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:38:32,285 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:38:32,286 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:38:32,287 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-25 19:38:32,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:38:32,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-25 19:38:32,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:38:32,654 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 19:38:32,654 INFO L388 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 16 treesize of output 16 [2021-11-25 19:38:32,911 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 19:38:32,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 19:38:34,341 INFO L354 Elim1Store]: treesize reduction 21, result has 47.5 percent of original size [2021-11-25 19:38:34,341 INFO L388 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 21 treesize of output 30 [2021-11-25 19:38:35,102 INFO L354 Elim1Store]: treesize reduction 43, result has 23.2 percent of original size [2021-11-25 19:38:35,102 INFO L388 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 25 treesize of output 24 [2021-11-25 19:38:36,991 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 69 treesize of output 38 [2021-11-25 19:38:36,998 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-25 19:38:36,998 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 14 [2021-11-25 19:38:37,241 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:38:37,241 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:38:37,241 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:38:37,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [110324303] [2021-11-25 19:38:37,241 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [110324303] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:38:37,241 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:38:37,242 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-11-25 19:38:37,242 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [299886214] [2021-11-25 19:38:37,242 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:38:37,242 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-25 19:38:37,242 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:38:37,243 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-25 19:38:37,243 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2021-11-25 19:38:37,243 INFO L87 Difference]: Start difference. First operand 414 states and 548 transitions. Second operand has 22 states, 21 states have (on average 2.142857142857143) internal successors, (45), 19 states have internal predecessors, (45), 4 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-25 19:38:44,105 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:38:46,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:38:46,594 INFO L93 Difference]: Finished difference Result 434 states and 560 transitions. [2021-11-25 19:38:46,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-25 19:38:46,596 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.142857142857143) internal successors, (45), 19 states have internal predecessors, (45), 4 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 55 [2021-11-25 19:38:46,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:38:46,598 INFO L225 Difference]: With dead ends: 434 [2021-11-25 19:38:46,599 INFO L226 Difference]: Without dead ends: 434 [2021-11-25 19:38:46,600 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 428 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=335, Invalid=1827, Unknown=0, NotChecked=0, Total=2162 [2021-11-25 19:38:46,601 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 354 mSDsluCounter, 646 mSDsCounter, 0 mSdLazyCounter, 1693 mSolverCounterSat, 75 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 354 SdHoareTripleChecker+Valid, 701 SdHoareTripleChecker+Invalid, 1769 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 1693 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:38:46,601 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [354 Valid, 701 Invalid, 1769 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 1693 Invalid, 1 Unknown, 0 Unchecked, 6.7s Time] [2021-11-25 19:38:46,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2021-11-25 19:38:46,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 414. [2021-11-25 19:38:46,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 414 states, 314 states have (on average 1.5031847133757963) internal successors, (472), 358 states have internal predecessors, (472), 37 states have call successors, (37), 28 states have call predecessors, (37), 28 states have return successors, (37), 27 states have call predecessors, (37), 37 states have call successors, (37) [2021-11-25 19:38:46,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 546 transitions. [2021-11-25 19:38:46,617 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 546 transitions. Word has length 55 [2021-11-25 19:38:46,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:38:46,618 INFO L470 AbstractCegarLoop]: Abstraction has 414 states and 546 transitions. [2021-11-25 19:38:46,618 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 2.142857142857143) internal successors, (45), 19 states have internal predecessors, (45), 4 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-25 19:38:46,618 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 546 transitions. [2021-11-25 19:38:46,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-25 19:38:46,619 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:38:46,619 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:38:46,661 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (43)] Forceful destruction successful, exit code 0 [2021-11-25 19:38:46,832 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:38:46,832 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting list_addErr0REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:38:46,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:38:46,833 INFO L85 PathProgramCache]: Analyzing trace with hash 1830134000, now seen corresponding path program 1 times [2021-11-25 19:38:46,834 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:38:46,834 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [236856997] [2021-11-25 19:38:46,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:38:46,834 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:38:46,834 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:38:46,835 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:38:46,836 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (44)] Waiting until timeout for monitored process [2021-11-25 19:38:47,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:38:47,106 INFO L263 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 19:38:47,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:38:47,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:38:47,333 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:38:47,333 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:38:47,333 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:38:47,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [236856997] [2021-11-25 19:38:47,334 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [236856997] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:38:47,334 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:38:47,334 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:38:47,334 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802529180] [2021-11-25 19:38:47,334 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:38:47,335 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:38:47,335 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:38:47,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:38:47,335 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:38:47,335 INFO L87 Difference]: Start difference. First operand 414 states and 546 transitions. Second operand has 7 states, 6 states have (on average 8.333333333333334) internal successors, (50), 6 states have internal predecessors, (50), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-25 19:38:48,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:38:48,043 INFO L93 Difference]: Finished difference Result 565 states and 746 transitions. [2021-11-25 19:38:48,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 19:38:48,045 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 8.333333333333334) internal successors, (50), 6 states have internal predecessors, (50), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 61 [2021-11-25 19:38:48,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:38:48,048 INFO L225 Difference]: With dead ends: 565 [2021-11-25 19:38:48,048 INFO L226 Difference]: Without dead ends: 565 [2021-11-25 19:38:48,049 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 51 SyntacticMatches, 5 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:38:48,049 INFO L933 BasicCegarLoop]: 133 mSDtfsCounter, 119 mSDsluCounter, 389 mSDsCounter, 0 mSdLazyCounter, 338 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 522 SdHoareTripleChecker+Invalid, 395 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 338 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 55 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:38:48,050 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [128 Valid, 522 Invalid, 395 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 338 Invalid, 0 Unknown, 55 Unchecked, 0.7s Time] [2021-11-25 19:38:48,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 565 states. [2021-11-25 19:38:48,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 565 to 434. [2021-11-25 19:38:48,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 434 states, 330 states have (on average 1.5151515151515151) internal successors, (500), 375 states have internal predecessors, (500), 39 states have call successors, (39), 30 states have call predecessors, (39), 30 states have return successors, (39), 28 states have call predecessors, (39), 39 states have call successors, (39) [2021-11-25 19:38:48,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 434 states to 434 states and 578 transitions. [2021-11-25 19:38:48,068 INFO L78 Accepts]: Start accepts. Automaton has 434 states and 578 transitions. Word has length 61 [2021-11-25 19:38:48,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:38:48,069 INFO L470 AbstractCegarLoop]: Abstraction has 434 states and 578 transitions. [2021-11-25 19:38:48,069 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 8.333333333333334) internal successors, (50), 6 states have internal predecessors, (50), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-25 19:38:48,069 INFO L276 IsEmpty]: Start isEmpty. Operand 434 states and 578 transitions. [2021-11-25 19:38:48,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-25 19:38:48,070 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:38:48,070 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:38:48,104 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (44)] Forceful destruction successful, exit code 0 [2021-11-25 19:38:48,284 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:38:48,284 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting list_addErr1REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:38:48,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:38:48,285 INFO L85 PathProgramCache]: Analyzing trace with hash 1830134001, now seen corresponding path program 1 times [2021-11-25 19:38:48,285 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:38:48,286 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [21807789] [2021-11-25 19:38:48,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:38:48,286 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:38:48,286 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:38:48,287 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:38:48,287 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-11-25 19:38:48,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:38:48,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 19:38:48,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:38:48,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:38:48,960 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:38:48,960 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:38:48,961 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:38:48,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [21807789] [2021-11-25 19:38:48,961 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [21807789] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:38:48,961 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:38:48,961 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:38:48,961 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773087626] [2021-11-25 19:38:48,961 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:38:48,962 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:38:48,962 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:38:48,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:38:48,962 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:38:48,963 INFO L87 Difference]: Start difference. First operand 434 states and 578 transitions. Second operand has 7 states, 6 states have (on average 8.333333333333334) internal successors, (50), 6 states have internal predecessors, (50), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-25 19:38:49,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:38:49,211 INFO L93 Difference]: Finished difference Result 453 states and 597 transitions. [2021-11-25 19:38:49,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 19:38:49,212 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 8.333333333333334) internal successors, (50), 6 states have internal predecessors, (50), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 61 [2021-11-25 19:38:49,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:38:49,215 INFO L225 Difference]: With dead ends: 453 [2021-11-25 19:38:49,215 INFO L226 Difference]: Without dead ends: 453 [2021-11-25 19:38:49,216 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 51 SyntacticMatches, 5 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:38:49,216 INFO L933 BasicCegarLoop]: 120 mSDtfsCounter, 63 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 274 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 51 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:38:49,217 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 274 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 75 Invalid, 0 Unknown, 51 Unchecked, 0.2s Time] [2021-11-25 19:38:49,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 453 states. [2021-11-25 19:38:49,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 453 to 446. [2021-11-25 19:38:49,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 446 states, 340 states have (on average 1.5147058823529411) internal successors, (515), 385 states have internal predecessors, (515), 40 states have call successors, (40), 31 states have call predecessors, (40), 31 states have return successors, (40), 29 states have call predecessors, (40), 40 states have call successors, (40) [2021-11-25 19:38:49,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 446 states to 446 states and 595 transitions. [2021-11-25 19:38:49,230 INFO L78 Accepts]: Start accepts. Automaton has 446 states and 595 transitions. Word has length 61 [2021-11-25 19:38:49,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:38:49,230 INFO L470 AbstractCegarLoop]: Abstraction has 446 states and 595 transitions. [2021-11-25 19:38:49,230 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 8.333333333333334) internal successors, (50), 6 states have internal predecessors, (50), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-25 19:38:49,231 INFO L276 IsEmpty]: Start isEmpty. Operand 446 states and 595 transitions. [2021-11-25 19:38:49,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-25 19:38:49,231 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:38:49,232 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:38:49,260 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (45)] Ended with exit code 0 [2021-11-25 19:38:49,445 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:38:49,445 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting list_addErr2REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:38:49,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:38:49,446 INFO L85 PathProgramCache]: Analyzing trace with hash 2117149745, now seen corresponding path program 1 times [2021-11-25 19:38:49,447 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:38:49,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [92670234] [2021-11-25 19:38:49,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:38:49,447 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:38:49,447 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:38:49,448 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:38:49,457 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (46)] Waiting until timeout for monitored process [2021-11-25 19:38:49,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:38:49,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 83 conjunts are in the unsatisfiable core [2021-11-25 19:38:49,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:38:49,970 INFO L354 Elim1Store]: treesize reduction 12, result has 52.0 percent of original size [2021-11-25 19:38:49,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 30 treesize of output 34 [2021-11-25 19:38:50,067 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-11-25 19:38:50,098 INFO L388 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 7 treesize of output 3 [2021-11-25 19:38:50,551 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 19:38:50,707 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 19:38:50,707 INFO L388 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 56 treesize of output 34 [2021-11-25 19:38:50,713 INFO L388 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 11 treesize of output 7 [2021-11-25 19:38:50,962 INFO L388 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 7 treesize of output 3 [2021-11-25 19:38:51,567 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:38:52,918 INFO L388 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 25 treesize of output 17 [2021-11-25 19:38:58,494 INFO L354 Elim1Store]: treesize reduction 78, result has 1.3 percent of original size [2021-11-25 19:38:58,494 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 106 treesize of output 38 [2021-11-25 19:39:00,056 INFO L354 Elim1Store]: treesize reduction 159, result has 8.1 percent of original size [2021-11-25 19:39:00,057 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 11 case distinctions, treesize of input 125 treesize of output 89 [2021-11-25 19:39:00,079 INFO L388 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 56 treesize of output 40 [2021-11-25 19:39:02,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:02,062 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-11-25 19:39:02,063 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 13 [2021-11-25 19:39:02,577 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:39:02,578 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:39:03,679 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:39:03,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [92670234] [2021-11-25 19:39:03,680 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [92670234] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:03,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1197937929] [2021-11-25 19:39:03,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:03,680 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:39:03,681 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:39:03,694 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:39:03,695 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (47)] Waiting until timeout for monitored process [2021-11-25 19:39:04,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:04,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 90 conjunts are in the unsatisfiable core [2021-11-25 19:39:04,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:04,907 INFO L354 Elim1Store]: treesize reduction 8, result has 52.9 percent of original size [2021-11-25 19:39:04,907 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 22 treesize of output 24 [2021-11-25 19:39:05,904 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 19:39:05,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 19:39:09,578 INFO L354 Elim1Store]: treesize reduction 21, result has 47.5 percent of original size [2021-11-25 19:39:09,578 INFO L388 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 44 [2021-11-25 19:39:11,656 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 19:39:11,657 INFO L388 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 21 treesize of output 20 [2021-11-25 19:39:12,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:39:19,691 INFO L354 Elim1Store]: treesize reduction 7, result has 30.0 percent of original size [2021-11-25 19:39:19,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 86 treesize of output 42 [2021-11-25 19:39:20,617 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 19:39:20,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 86 treesize of output 44 [2021-11-25 19:39:22,492 INFO L354 Elim1Store]: treesize reduction 338, result has 8.4 percent of original size [2021-11-25 19:39:22,493 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 10 new quantified variables, introduced 20 case distinctions, treesize of input 165 treesize of output 138 [2021-11-25 19:39:22,501 INFO L388 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 156 treesize of output 124 [2021-11-25 19:39:22,515 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 15 [2021-11-25 19:39:22,529 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:22,536 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 19:39:22,537 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 20 [2021-11-25 19:39:22,543 INFO L388 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 9 treesize of output 7 [2021-11-25 19:39:24,000 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 19:39:24,001 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 56 treesize of output 23 [2021-11-25 19:39:24,576 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:39:24,576 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:39:24,934 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2085 (Array (_ BitVec 32) (_ BitVec 32)))) (= (_ bv0 1) (bvadd (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (bvneg (select |c_#valid| (select (select (let ((.cse0 (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_list_move_#t~mem8#1.base| v_ArrVal_2085))) (store .cse0 |c_ULTIMATE.start_list_move_#t~mem7#1.base| (store (select .cse0 |c_ULTIMATE.start_list_move_#t~mem7#1.base|) |c_ULTIMATE.start_list_move_#t~mem7#1.offset| |c_ULTIMATE.start_list_move_#t~mem8#1.base|))) |c_ULTIMATE.start_list_move_~head#1.base|) |c_ULTIMATE.start_list_move_~head#1.offset|)))))))))) (_ bv1 1)))) is different from false [2021-11-25 19:39:24,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1197937929] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:24,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [218177134] [2021-11-25 19:39:24,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:24,937 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:24,937 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:24,939 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:24,941 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-25 19:39:25,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:25,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 85 conjunts are in the unsatisfiable core [2021-11-25 19:39:25,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:25,622 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 19:39:25,623 INFO L388 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 18 treesize of output 18 [2021-11-25 19:39:26,224 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 19:39:26,245 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 19:39:27,448 INFO L354 Elim1Store]: treesize reduction 21, result has 47.5 percent of original size [2021-11-25 19:39:27,448 INFO L388 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 21 treesize of output 30 [2021-11-25 19:39:29,121 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 19:39:29,122 INFO L388 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 21 treesize of output 20 [2021-11-25 19:39:30,011 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:39:37,768 INFO L354 Elim1Store]: treesize reduction 7, result has 30.0 percent of original size [2021-11-25 19:39:37,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 86 treesize of output 42 [2021-11-25 19:39:38,818 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 19:39:38,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 69 treesize of output 35 [2021-11-25 19:39:39,800 INFO L354 Elim1Store]: treesize reduction 338, result has 8.4 percent of original size [2021-11-25 19:39:39,800 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 10 new quantified variables, introduced 20 case distinctions, treesize of input 149 treesize of output 128 [2021-11-25 19:39:39,809 INFO L388 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 146 treesize of output 116 [2021-11-25 19:39:39,832 INFO L388 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 16 treesize of output 15 [2021-11-25 19:39:39,862 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:39,872 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 19:39:39,873 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 25 [2021-11-25 19:39:39,883 INFO L388 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 9 treesize of output 7 [2021-11-25 19:39:41,483 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 19:39:41,484 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 56 treesize of output 23 [2021-11-25 19:39:41,773 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:39:41,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:39:42,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [218177134] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:42,479 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:39:42,479 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 33, 30] total 84 [2021-11-25 19:39:42,479 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250983575] [2021-11-25 19:39:42,480 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:39:42,480 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2021-11-25 19:39:42,480 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:39:42,481 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-11-25 19:39:42,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=8109, Unknown=137, NotChecked=182, Total=8742 [2021-11-25 19:39:42,484 INFO L87 Difference]: Start difference. First operand 446 states and 595 transitions. Second operand has 86 states, 82 states have (on average 1.7195121951219512) internal successors, (141), 77 states have internal predecessors, (141), 18 states have call successors, (18), 16 states have call predecessors, (18), 13 states have return successors, (15), 12 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-25 19:39:56,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:56,292 INFO L93 Difference]: Finished difference Result 449 states and 597 transitions. [2021-11-25 19:39:56,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-25 19:39:56,293 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 82 states have (on average 1.7195121951219512) internal successors, (141), 77 states have internal predecessors, (141), 18 states have call successors, (18), 16 states have call predecessors, (18), 13 states have return successors, (15), 12 states have call predecessors, (15), 15 states have call successors, (15) Word has length 63 [2021-11-25 19:39:56,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:56,296 INFO L225 Difference]: With dead ends: 449 [2021-11-25 19:39:56,296 INFO L226 Difference]: Without dead ends: 449 [2021-11-25 19:39:56,298 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 110 SyntacticMatches, 11 SemanticMatches, 127 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 4522 ImplicationChecksByTransitivity, 41.6s TimeCoverageRelationStatistics Valid=589, Invalid=15440, Unknown=231, NotChecked=252, Total=16512 [2021-11-25 19:39:56,298 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 80 mSDsluCounter, 3509 mSDsCounter, 0 mSdLazyCounter, 680 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 3613 SdHoareTripleChecker+Invalid, 2358 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 680 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1668 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:56,299 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 3613 Invalid, 2358 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 680 Invalid, 0 Unknown, 1668 Unchecked, 2.1s Time] [2021-11-25 19:39:56,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 449 states. [2021-11-25 19:39:56,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 449 to 446. [2021-11-25 19:39:56,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 446 states, 340 states have (on average 1.511764705882353) internal successors, (514), 385 states have internal predecessors, (514), 40 states have call successors, (40), 31 states have call predecessors, (40), 31 states have return successors, (40), 29 states have call predecessors, (40), 40 states have call successors, (40) [2021-11-25 19:39:56,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 446 states to 446 states and 594 transitions. [2021-11-25 19:39:56,311 INFO L78 Accepts]: Start accepts. Automaton has 446 states and 594 transitions. Word has length 63 [2021-11-25 19:39:56,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:56,312 INFO L470 AbstractCegarLoop]: Abstraction has 446 states and 594 transitions. [2021-11-25 19:39:56,312 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 82 states have (on average 1.7195121951219512) internal successors, (141), 77 states have internal predecessors, (141), 18 states have call successors, (18), 16 states have call predecessors, (18), 13 states have return successors, (15), 12 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-25 19:39:56,313 INFO L276 IsEmpty]: Start isEmpty. Operand 446 states and 594 transitions. [2021-11-25 19:39:56,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-25 19:39:56,313 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:56,314 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:56,326 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (47)] Forceful destruction successful, exit code 0 [2021-11-25 19:39:56,531 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (46)] Forceful destruction successful, exit code 0 [2021-11-25 19:39:56,743 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2021-11-25 19:39:56,920 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:56,921 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting list_addErr3REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:39:56,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:56,921 INFO L85 PathProgramCache]: Analyzing trace with hash 2117149746, now seen corresponding path program 1 times [2021-11-25 19:39:56,922 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:39:56,922 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1002689680] [2021-11-25 19:39:56,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:56,922 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:39:56,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:39:56,923 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:39:56,923 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (49)] Waiting until timeout for monitored process [2021-11-25 19:39:57,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:57,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 106 conjunts are in the unsatisfiable core [2021-11-25 19:39:57,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:57,520 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:39:57,521 INFO L388 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 1 case distinctions, treesize of input 12 treesize of output 18 [2021-11-25 19:39:57,580 INFO L354 Elim1Store]: treesize reduction 12, result has 52.0 percent of original size [2021-11-25 19:39:57,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 39 [2021-11-25 19:39:57,781 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-11-25 19:39:57,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-11-25 19:39:57,847 INFO L388 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 7 treesize of output 3 [2021-11-25 19:39:57,879 INFO L388 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 7 treesize of output 3 [2021-11-25 19:39:58,541 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 19:40:00,788 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 19:40:00,789 INFO L388 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 21 treesize of output 20 [2021-11-25 19:40:00,798 INFO L388 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 11 treesize of output 7 [2021-11-25 19:40:01,096 INFO L388 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 7 treesize of output 3 [2021-11-25 19:40:01,157 INFO L388 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 7 treesize of output 3 [2021-11-25 19:40:02,048 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:02,051 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-11-25 19:40:08,491 INFO L354 Elim1Store]: treesize reduction 68, result has 1.4 percent of original size [2021-11-25 19:40:08,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 125 treesize of output 54 [2021-11-25 19:40:08,500 INFO L388 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 7 treesize of output 3 [2021-11-25 19:40:10,131 INFO L354 Elim1Store]: treesize reduction 159, result has 8.1 percent of original size [2021-11-25 19:40:10,131 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 11 case distinctions, treesize of input 163 treesize of output 119 [2021-11-25 19:40:10,141 INFO L388 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 102 treesize of output 78 [2021-11-25 19:40:10,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:10,187 INFO L354 Elim1Store]: treesize reduction 74, result has 6.3 percent of original size [2021-11-25 19:40:10,187 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 59 treesize of output 42 [2021-11-25 19:40:10,197 INFO L388 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 27 treesize of output 21 [2021-11-25 19:40:13,712 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:13,716 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-11-25 19:40:13,716 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 13 [2021-11-25 19:40:13,724 INFO L388 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 15 treesize of output 7 [2021-11-25 19:40:14,390 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:40:14,391 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:40:16,285 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_2240 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_2238 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse0 (select (select (store (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_list_move_#t~mem8#1.base| v_ArrVal_2238) |c_ULTIMATE.start_list_move_#t~mem7#1.base| v_ArrVal_2240) |c_ULTIMATE.start_list_move_~head#1.base|) |c_ULTIMATE.start_list_move_~head#1.offset|))) (bvule (bvadd .cse0 (_ bv4 32)) (bvadd .cse0 (_ bv8 32))))) (forall ((v_ArrVal_2240 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_2237 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_2238 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_2239 (Array (_ BitVec 32) (_ BitVec 32)))) (bvule (bvadd (select (select (store (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_list_move_#t~mem8#1.base| v_ArrVal_2238) |c_ULTIMATE.start_list_move_#t~mem7#1.base| v_ArrVal_2240) |c_ULTIMATE.start_list_move_~head#1.base|) |c_ULTIMATE.start_list_move_~head#1.offset|) (_ bv8 32)) (select |c_#length| (select (select (store (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_list_move_#t~mem8#1.base| v_ArrVal_2239) |c_ULTIMATE.start_list_move_#t~mem7#1.base| v_ArrVal_2237) |c_ULTIMATE.start_list_move_~head#1.base|) |c_ULTIMATE.start_list_move_~head#1.offset|))))) is different from false [2021-11-25 19:40:16,294 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:40:16,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1002689680] [2021-11-25 19:40:16,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1002689680] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:40:16,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [974539005] [2021-11-25 19:40:16,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:40:16,295 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:40:16,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:40:16,295 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:40:16,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (50)] Waiting until timeout for monitored process [2021-11-25 19:40:17,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:17,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 92 conjunts are in the unsatisfiable core [2021-11-25 19:40:17,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:40:17,969 INFO L354 Elim1Store]: treesize reduction 8, result has 52.9 percent of original size [2021-11-25 19:40:17,969 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 19:40:19,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 19:40:20,091 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 19:40:20,091 INFO L388 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 56 treesize of output 34 [2021-11-25 19:40:20,097 INFO L388 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 11 treesize of output 7 [2021-11-25 19:40:21,623 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:40:32,955 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:32,962 INFO L354 Elim1Store]: treesize reduction 44, result has 2.2 percent of original size [2021-11-25 19:40:32,962 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 5 case distinctions, treesize of input 64 treesize of output 33 [2021-11-25 19:40:32,972 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:32,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-25 19:40:35,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:35,550 INFO L354 Elim1Store]: treesize reduction 186, result has 7.0 percent of original size [2021-11-25 19:40:35,551 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 8 new quantified variables, introduced 10 case distinctions, treesize of input 166 treesize of output 117 [2021-11-25 19:40:35,560 INFO L388 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 114 treesize of output 88 [2021-11-25 19:40:35,569 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:35,603 INFO L354 Elim1Store]: treesize reduction 117, result has 4.1 percent of original size [2021-11-25 19:40:35,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 73 treesize of output 54 [2021-11-25 19:40:35,612 INFO L388 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 19 treesize of output 15 [2021-11-25 19:40:37,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:40:37,859 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 13 [2021-11-25 19:40:37,870 INFO L388 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 15 treesize of output 7 [2021-11-25 19:40:38,861 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:40:38,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:40:39,120 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_2320 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_2318 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse0 (select (select (store (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_list_move_#t~mem8#1.base| v_ArrVal_2318) |c_ULTIMATE.start_list_move_#t~mem7#1.base| v_ArrVal_2320) |c_ULTIMATE.start_list_move_~head#1.base|) |c_ULTIMATE.start_list_move_~head#1.offset|))) (bvule (bvadd (_ bv4 32) .cse0) (bvadd .cse0 (_ bv8 32))))) (forall ((v_ArrVal_2320 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_2318 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_2319 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_2317 (Array (_ BitVec 32) (_ BitVec 32)))) (bvule (bvadd (select (select (store (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_list_move_#t~mem8#1.base| v_ArrVal_2318) |c_ULTIMATE.start_list_move_#t~mem7#1.base| v_ArrVal_2320) |c_ULTIMATE.start_list_move_~head#1.base|) |c_ULTIMATE.start_list_move_~head#1.offset|) (_ bv8 32)) (select |c_#length| (select (select (store (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_list_move_#t~mem8#1.base| v_ArrVal_2317) |c_ULTIMATE.start_list_move_#t~mem7#1.base| v_ArrVal_2319) |c_ULTIMATE.start_list_move_~head#1.base|) |c_ULTIMATE.start_list_move_~head#1.offset|))))) is different from false [2021-11-25 19:40:39,132 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [974539005] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:40:39,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [417153359] [2021-11-25 19:40:39,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:40:39,133 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:40:39,133 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:40:39,134 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:40:39,135 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-25 19:40:39,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:39,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 86 conjunts are in the unsatisfiable core [2021-11-25 19:40:39,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:40:39,857 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 19:40:39,857 INFO L388 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 16 treesize of output 16 [2021-11-25 19:40:41,802 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 19:40:42,289 INFO L388 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 11 treesize of output 7 [2021-11-25 19:40:46,700 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-25 19:40:46,700 INFO L388 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 21 treesize of output 20 [2021-11-25 19:40:47,874 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:40:47,898 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-11-25 19:40:47,899 INFO L388 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 22 treesize of output 22 [2021-11-25 19:40:58,196 INFO L354 Elim1Store]: treesize reduction 60, result has 1.6 percent of original size [2021-11-25 19:40:58,197 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 72 treesize of output 37 [2021-11-25 19:40:58,203 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-25 19:41:00,421 INFO L354 Elim1Store]: treesize reduction 194, result has 6.7 percent of original size [2021-11-25 19:41:00,421 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 8 new quantified variables, introduced 11 case distinctions, treesize of input 174 treesize of output 123 [2021-11-25 19:41:00,430 INFO L388 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 107 treesize of output 85 [2021-11-25 19:41:00,464 INFO L354 Elim1Store]: treesize reduction 117, result has 4.1 percent of original size [2021-11-25 19:41:00,465 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 73 treesize of output 54 [2021-11-25 19:41:00,472 INFO L388 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 19 treesize of output 15 [2021-11-25 19:41:02,031 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:41:02,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 41 treesize of output 17 [2021-11-25 19:41:02,036 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 15 treesize of output 7 [2021-11-25 19:41:02,719 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:41:02,719 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:41:03,034 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_2395 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_2398 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_2396 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_2397 (Array (_ BitVec 32) (_ BitVec 32)))) (bvule (bvadd (_ bv8 32) (select (select (store (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_list_move_#t~mem8#1.base| v_ArrVal_2396) |c_ULTIMATE.start_list_move_#t~mem7#1.base| v_ArrVal_2395) |c_ULTIMATE.start_list_move_~head#1.base|) |c_ULTIMATE.start_list_move_~head#1.offset|)) (select |c_#length| (select (select (store (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_list_move_#t~mem8#1.base| v_ArrVal_2398) |c_ULTIMATE.start_list_move_#t~mem7#1.base| v_ArrVal_2397) |c_ULTIMATE.start_list_move_~head#1.base|) |c_ULTIMATE.start_list_move_~head#1.offset|)))) (forall ((v_ArrVal_2395 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_2396 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse0 (select (select (store (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_list_move_#t~mem8#1.base| v_ArrVal_2396) |c_ULTIMATE.start_list_move_#t~mem7#1.base| v_ArrVal_2395) |c_ULTIMATE.start_list_move_~head#1.base|) |c_ULTIMATE.start_list_move_~head#1.offset|))) (bvule (bvadd (_ bv4 32) .cse0) (bvadd (_ bv8 32) .cse0))))) is different from false [2021-11-25 19:41:03,043 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [417153359] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:41:03,043 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:41:03,043 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 30, 31] total 93 [2021-11-25 19:41:03,043 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291652437] [2021-11-25 19:41:03,043 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:41:03,044 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 95 states [2021-11-25 19:41:03,044 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:41:03,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2021-11-25 19:41:03,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=393, Invalid=9296, Unknown=223, NotChecked=594, Total=10506 [2021-11-25 19:41:03,046 INFO L87 Difference]: Start difference. First operand 446 states and 594 transitions. Second operand has 95 states, 91 states have (on average 1.7142857142857142) internal successors, (156), 85 states have internal predecessors, (156), 18 states have call successors, (18), 18 states have call predecessors, (18), 15 states have return successors, (15), 12 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-25 19:41:16,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:41:16,730 INFO L93 Difference]: Finished difference Result 448 states and 593 transitions. [2021-11-25 19:41:16,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-11-25 19:41:16,731 INFO L78 Accepts]: Start accepts. Automaton has has 95 states, 91 states have (on average 1.7142857142857142) internal successors, (156), 85 states have internal predecessors, (156), 18 states have call successors, (18), 18 states have call predecessors, (18), 15 states have return successors, (15), 12 states have call predecessors, (15), 15 states have call successors, (15) Word has length 63 [2021-11-25 19:41:16,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:41:16,734 INFO L225 Difference]: With dead ends: 448 [2021-11-25 19:41:16,734 INFO L226 Difference]: Without dead ends: 448 [2021-11-25 19:41:16,737 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 107 SyntacticMatches, 6 SemanticMatches, 127 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 4234 ImplicationChecksByTransitivity, 52.2s TimeCoverageRelationStatistics Valid=625, Invalid=14837, Unknown=300, NotChecked=750, Total=16512 [2021-11-25 19:41:16,738 INFO L933 BasicCegarLoop]: 108 mSDtfsCounter, 84 mSDsluCounter, 3055 mSDsCounter, 0 mSdLazyCounter, 199 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 3163 SdHoareTripleChecker+Invalid, 1974 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1764 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:41:16,738 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 3163 Invalid, 1974 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 199 Invalid, 0 Unknown, 1764 Unchecked, 0.5s Time] [2021-11-25 19:41:16,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 448 states. [2021-11-25 19:41:16,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 448 to 446. [2021-11-25 19:41:16,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 446 states, 340 states have (on average 1.5058823529411764) internal successors, (512), 385 states have internal predecessors, (512), 40 states have call successors, (40), 31 states have call predecessors, (40), 31 states have return successors, (40), 29 states have call predecessors, (40), 40 states have call successors, (40) [2021-11-25 19:41:16,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 446 states to 446 states and 592 transitions. [2021-11-25 19:41:16,753 INFO L78 Accepts]: Start accepts. Automaton has 446 states and 592 transitions. Word has length 63 [2021-11-25 19:41:16,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:41:16,754 INFO L470 AbstractCegarLoop]: Abstraction has 446 states and 592 transitions. [2021-11-25 19:41:16,754 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 95 states, 91 states have (on average 1.7142857142857142) internal successors, (156), 85 states have internal predecessors, (156), 18 states have call successors, (18), 18 states have call predecessors, (18), 15 states have return successors, (15), 12 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-25 19:41:16,755 INFO L276 IsEmpty]: Start isEmpty. Operand 446 states and 592 transitions. [2021-11-25 19:41:16,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-25 19:41:16,756 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:41:16,756 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:41:16,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2021-11-25 19:41:16,984 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (49)] Ended with exit code 0 [2021-11-25 19:41:17,177 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (50)] Forceful destruction successful, exit code 0 [2021-11-25 19:41:17,372 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 19:41:17,373 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting list_addErr4REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:41:17,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:41:17,373 INFO L85 PathProgramCache]: Analyzing trace with hash 1207132653, now seen corresponding path program 1 times [2021-11-25 19:41:17,374 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:41:17,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1212473882] [2021-11-25 19:41:17,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:41:17,374 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:41:17,374 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:41:17,375 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:41:17,376 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (52)] Waiting until timeout for monitored process [2021-11-25 19:41:17,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:41:17,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 19:41:17,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:41:18,008 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 19:41:18,008 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:41:18,008 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:41:18,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1212473882] [2021-11-25 19:41:18,008 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1212473882] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:41:18,008 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:41:18,009 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-25 19:41:18,009 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1258264700] [2021-11-25 19:41:18,009 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:41:18,009 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-25 19:41:18,009 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:41:18,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-25 19:41:18,010 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-25 19:41:18,010 INFO L87 Difference]: Start difference. First operand 446 states and 592 transitions. Second operand has 12 states, 11 states have (on average 4.454545454545454) internal successors, (49), 11 states have internal predecessors, (49), 2 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 19:41:19,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:41:19,526 INFO L93 Difference]: Finished difference Result 675 states and 929 transitions. [2021-11-25 19:41:19,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 19:41:19,527 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 4.454545454545454) internal successors, (49), 11 states have internal predecessors, (49), 2 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 64 [2021-11-25 19:41:19,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:41:19,531 INFO L225 Difference]: With dead ends: 675 [2021-11-25 19:41:19,532 INFO L226 Difference]: Without dead ends: 675 [2021-11-25 19:41:19,532 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=87, Invalid=333, Unknown=0, NotChecked=0, Total=420 [2021-11-25 19:41:19,533 INFO L933 BasicCegarLoop]: 132 mSDtfsCounter, 180 mSDsluCounter, 821 mSDsCounter, 0 mSdLazyCounter, 639 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 188 SdHoareTripleChecker+Valid, 953 SdHoareTripleChecker+Invalid, 795 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 639 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 145 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:41:19,533 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [188 Valid, 953 Invalid, 795 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 639 Invalid, 0 Unknown, 145 Unchecked, 1.3s Time] [2021-11-25 19:41:19,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 675 states. [2021-11-25 19:41:19,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 675 to 545. [2021-11-25 19:41:19,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 545 states, 424 states have (on average 1.509433962264151) internal successors, (640), 469 states have internal predecessors, (640), 51 states have call successors, (51), 35 states have call predecessors, (51), 35 states have return successors, (51), 40 states have call predecessors, (51), 51 states have call successors, (51) [2021-11-25 19:41:19,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 545 states to 545 states and 742 transitions. [2021-11-25 19:41:19,553 INFO L78 Accepts]: Start accepts. Automaton has 545 states and 742 transitions. Word has length 64 [2021-11-25 19:41:19,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:41:19,553 INFO L470 AbstractCegarLoop]: Abstraction has 545 states and 742 transitions. [2021-11-25 19:41:19,554 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 4.454545454545454) internal successors, (49), 11 states have internal predecessors, (49), 2 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 19:41:19,554 INFO L276 IsEmpty]: Start isEmpty. Operand 545 states and 742 transitions. [2021-11-25 19:41:19,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-25 19:41:19,555 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:41:19,555 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:41:19,575 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (52)] Forceful destruction successful, exit code 0 [2021-11-25 19:41:19,789 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:41:19,789 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting list_addErr5REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:41:19,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:41:19,789 INFO L85 PathProgramCache]: Analyzing trace with hash 1207132654, now seen corresponding path program 1 times [2021-11-25 19:41:19,790 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:41:19,791 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1464388663] [2021-11-25 19:41:19,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:41:19,791 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:41:19,791 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:41:19,792 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:41:19,793 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (53)] Waiting until timeout for monitored process [2021-11-25 19:41:20,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:41:20,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-25 19:41:20,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:41:20,262 INFO L388 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 11 treesize of output 7 [2021-11-25 19:41:20,386 INFO L388 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 15 treesize of output 7 [2021-11-25 19:41:20,986 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 19:41:20,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:41:22,046 INFO L388 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 8 treesize of output 6 [2021-11-25 19:41:23,421 INFO L388 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 36 treesize of output 28 [2021-11-25 19:41:24,387 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 19:41:24,388 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:41:24,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1464388663] [2021-11-25 19:41:24,388 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1464388663] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:41:24,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [374015072] [2021-11-25 19:41:24,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:41:24,388 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:41:24,388 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:41:24,389 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:41:24,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (54)] Waiting until timeout for monitored process [2021-11-25 19:41:24,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:41:24,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-25 19:41:24,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:41:25,631 INFO L388 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 11 treesize of output 7 [2021-11-25 19:41:26,230 INFO L388 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 7 treesize of output 3 [2021-11-25 19:41:26,235 INFO L388 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 15 treesize of output 7 [2021-11-25 19:41:26,474 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 19:41:26,474 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:41:26,683 INFO L388 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 8 treesize of output 6 [2021-11-25 19:41:27,641 INFO L388 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 36 treesize of output 28 [2021-11-25 19:41:28,824 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 19:41:28,824 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [374015072] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:41:28,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [442947397] [2021-11-25 19:41:28,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:41:28,825 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:41:28,825 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:41:28,825 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:41:28,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-25 19:41:29,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:41:29,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-25 19:41:29,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:41:29,169 INFO L388 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 11 treesize of output 7 [2021-11-25 19:41:29,255 INFO L388 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 15 treesize of output 7 [2021-11-25 19:41:30,698 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 19:41:30,699 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:41:30,824 INFO L388 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 [2021-11-25 19:41:33,826 INFO L388 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 36 treesize of output 28 [2021-11-25 19:41:33,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:33,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:35,319 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 19:41:35,320 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [442947397] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:41:35,320 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 19:41:35,320 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 17, 15, 16, 15] total 57 [2021-11-25 19:41:35,320 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681211225] [2021-11-25 19:41:35,320 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 19:41:35,321 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-25 19:41:35,321 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:41:35,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-25 19:41:35,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=3096, Unknown=0, NotChecked=0, Total=3306 [2021-11-25 19:41:35,322 INFO L87 Difference]: Start difference. First operand 545 states and 742 transitions. Second operand has 58 states, 57 states have (on average 3.017543859649123) internal successors, (172), 55 states have internal predecessors, (172), 14 states have call successors, (21), 9 states have call predecessors, (21), 10 states have return successors, (19), 10 states have call predecessors, (19), 14 states have call successors, (19) [2021-11-25 19:42:21,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:42:21,753 INFO L93 Difference]: Finished difference Result 1249 states and 1610 transitions. [2021-11-25 19:42:21,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-11-25 19:42:21,755 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 57 states have (on average 3.017543859649123) internal successors, (172), 55 states have internal predecessors, (172), 14 states have call successors, (21), 9 states have call predecessors, (21), 10 states have return successors, (19), 10 states have call predecessors, (19), 14 states have call successors, (19) Word has length 64 [2021-11-25 19:42:21,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:42:21,760 INFO L225 Difference]: With dead ends: 1249 [2021-11-25 19:42:21,760 INFO L226 Difference]: Without dead ends: 1249 [2021-11-25 19:42:21,761 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 443 GetRequests, 320 SyntacticMatches, 4 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3929 ImplicationChecksByTransitivity, 28.5s TimeCoverageRelationStatistics Valid=1263, Invalid=13257, Unknown=0, NotChecked=0, Total=14520 [2021-11-25 19:42:21,761 INFO L933 BasicCegarLoop]: 276 mSDtfsCounter, 1023 mSDsluCounter, 6430 mSDsCounter, 0 mSdLazyCounter, 4351 mSolverCounterSat, 141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 25.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1038 SdHoareTripleChecker+Valid, 6706 SdHoareTripleChecker+Invalid, 4829 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 141 IncrementalHoareTripleChecker+Valid, 4351 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 337 IncrementalHoareTripleChecker+Unchecked, 27.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:42:21,761 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1038 Valid, 6706 Invalid, 4829 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [141 Valid, 4351 Invalid, 0 Unknown, 337 Unchecked, 27.5s Time] [2021-11-25 19:42:21,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1249 states. [2021-11-25 19:42:21,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1249 to 615. [2021-11-25 19:42:21,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 615 states, 482 states have (on average 1.508298755186722) internal successors, (727), 529 states have internal predecessors, (727), 58 states have call successors, (58), 40 states have call predecessors, (58), 40 states have return successors, (58), 45 states have call predecessors, (58), 58 states have call successors, (58) [2021-11-25 19:42:21,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 615 states to 615 states and 843 transitions. [2021-11-25 19:42:21,784 INFO L78 Accepts]: Start accepts. Automaton has 615 states and 843 transitions. Word has length 64 [2021-11-25 19:42:21,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:42:21,784 INFO L470 AbstractCegarLoop]: Abstraction has 615 states and 843 transitions. [2021-11-25 19:42:21,785 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 57 states have (on average 3.017543859649123) internal successors, (172), 55 states have internal predecessors, (172), 14 states have call successors, (21), 9 states have call predecessors, (21), 10 states have return successors, (19), 10 states have call predecessors, (19), 14 states have call successors, (19) [2021-11-25 19:42:21,785 INFO L276 IsEmpty]: Start isEmpty. Operand 615 states and 843 transitions. [2021-11-25 19:42:21,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 19:42:21,786 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:42:21,786 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1] [2021-11-25 19:42:21,823 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2021-11-25 19:42:22,021 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (53)] Ended with exit code 0 [2021-11-25 19:42:22,215 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (54)] Ended with exit code 0 [2021-11-25 19:42:22,412 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 19:42:22,413 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting val_from_nodeErr0REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:42:22,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:42:22,413 INFO L85 PathProgramCache]: Analyzing trace with hash -1126558283, now seen corresponding path program 1 times [2021-11-25 19:42:22,414 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:42:22,414 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [735813000] [2021-11-25 19:42:22,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:42:22,414 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:42:22,414 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:42:22,415 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:42:22,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (56)] Waiting until timeout for monitored process [2021-11-25 19:42:22,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:42:22,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 62 conjunts are in the unsatisfiable core [2021-11-25 19:42:22,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:42:23,027 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 19:42:23,027 INFO L388 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 16 treesize of output 16 [2021-11-25 19:42:23,071 INFO L388 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 14 treesize of output 16 [2021-11-25 19:42:23,097 INFO L388 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 7 treesize of output 3 [2021-11-25 19:42:23,301 INFO L388 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 7 treesize of output 3 [2021-11-25 19:42:23,355 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 19:42:23,355 INFO L388 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 19 treesize of output 19 [2021-11-25 19:42:23,657 INFO L388 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 11 treesize of output 7 [2021-11-25 19:42:23,773 INFO L354 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2021-11-25 19:42:23,774 INFO L388 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 28 treesize of output 27 [2021-11-25 19:42:23,809 INFO L388 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 11 treesize of output 7 [2021-11-25 19:42:23,853 INFO L354 Elim1Store]: treesize reduction 25, result has 47.9 percent of original size [2021-11-25 19:42:23,853 INFO L388 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 30 treesize of output 41 [2021-11-25 19:42:24,342 INFO L354 Elim1Store]: treesize reduction 51, result has 42.0 percent of original size [2021-11-25 19:42:24,342 INFO L388 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 36 treesize of output 55 [2021-11-25 19:42:24,520 INFO L388 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 32 treesize of output 24 [2021-11-25 19:42:24,923 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-25 19:42:24,923 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 25 [2021-11-25 19:42:25,169 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 19:42:25,170 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:42:31,189 INFO L354 Elim1Store]: treesize reduction -1, result has 104.0 percent of original size [2021-11-25 19:42:31,190 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 135 treesize of output 150 [2021-11-25 19:42:31,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 106 treesize of output 102 [2021-11-25 19:42:40,353 INFO L354 Elim1Store]: treesize reduction 132, result has 62.2 percent of original size [2021-11-25 19:42:40,355 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 1 disjoint index pairs (out of 36 index pairs), introduced 10 new quantified variables, introduced 36 case distinctions, treesize of input 392906 treesize of output 375718 [2021-11-25 19:42:51,818 WARN L227 SmtUtils]: Spent 11.46s on a formula simplification. DAG size of input: 1111 DAG size of output: 1090 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-25 19:42:52,675 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:42:52,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [735813000] [2021-11-25 19:42:52,675 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: BigInteger out of long range [2021-11-25 19:42:52,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1441726163] [2021-11-25 19:42:52,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:42:52,675 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:42:52,676 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:42:52,676 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:42:52,677 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (57)] Waiting until timeout for monitored process [2021-11-25 19:42:54,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:42:54,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 58 conjunts are in the unsatisfiable core [2021-11-25 19:42:54,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:42:55,115 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 19:42:55,115 INFO L388 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 19 treesize of output 19 [2021-11-25 19:42:55,479 INFO L388 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 7 treesize of output 3 [2021-11-25 19:42:55,919 INFO L388 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 11 treesize of output 7 [2021-11-25 19:42:56,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:42:56,132 INFO L388 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 28 treesize of output 27 [2021-11-25 19:42:56,203 INFO L354 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2021-11-25 19:42:56,203 INFO L388 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 27 treesize of output 34 [2021-11-25 19:42:56,265 INFO L388 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 11 treesize of output 7 [2021-11-25 19:42:57,011 INFO L354 Elim1Store]: treesize reduction 39, result has 42.6 percent of original size [2021-11-25 19:42:57,011 INFO L388 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 32 treesize of output 47 [2021-11-25 19:42:57,660 INFO L388 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 15 treesize of output 7 [2021-11-25 19:42:58,507 INFO L354 Elim1Store]: treesize reduction 6, result has 76.0 percent of original size [2021-11-25 19:42:58,507 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 63 treesize of output 52 [2021-11-25 19:42:58,692 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 10 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:42:58,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:43:27,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1441726163] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:43:27,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1373724514] [2021-11-25 19:43:27,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:43:27,169 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:43:27,169 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:43:27,171 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:43:27,184 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-25 19:43:27,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:43:27,458 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-25 19:43:27,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:43:28,109 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 19:43:28,109 INFO L388 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 22 treesize of output 22 [2021-11-25 19:43:28,816 INFO L388 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 11 treesize of output 7 [2021-11-25 19:43:29,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:43:29,036 INFO L388 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 28 treesize of output 27 [2021-11-25 19:43:29,055 INFO L388 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 11 treesize of output 7 [2021-11-25 19:43:29,106 INFO L354 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2021-11-25 19:43:29,107 INFO L388 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 26 treesize of output 33 [2021-11-25 19:43:29,791 INFO L354 Elim1Store]: treesize reduction 39, result has 42.6 percent of original size [2021-11-25 19:43:29,792 INFO L388 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 33 treesize of output 48 [2021-11-25 19:43:30,104 INFO L388 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 15 treesize of output 7 [2021-11-25 19:43:30,979 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-25 19:43:30,979 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 24 [2021-11-25 19:43:31,174 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 5 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:43:31,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:43:33,097 INFO L354 Elim1Store]: treesize reduction -1, result has 104.0 percent of original size [2021-11-25 19:43:33,097 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 146 treesize of output 161 [2021-11-25 19:43:33,353 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 106 treesize of output 102 [2021-11-25 19:43:44,851 INFO L354 Elim1Store]: treesize reduction 99, result has 63.7 percent of original size [2021-11-25 19:43:44,852 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 1 disjoint index pairs (out of 28 index pairs), introduced 9 new quantified variables, introduced 28 case distinctions, treesize of input 17902 treesize of output 17375 [2021-11-25 19:43:45,495 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: BigInteger out of long range [2021-11-25 19:43:45,496 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:43:45,496 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2021-11-25 19:43:45,496 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [473761172] [2021-11-25 19:43:45,496 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-25 19:43:45,497 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-25 19:43:45,497 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:43:45,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-25 19:43:45,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=4371, Unknown=16, NotChecked=0, Total=4692 [2021-11-25 19:43:45,498 INFO L87 Difference]: Start difference. First operand 615 states and 843 transitions. Second operand has 23 states, 22 states have (on average 2.4545454545454546) internal successors, (54), 21 states have internal predecessors, (54), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-25 19:43:49,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:43:49,111 INFO L93 Difference]: Finished difference Result 631 states and 861 transitions. [2021-11-25 19:43:49,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-25 19:43:49,112 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.4545454545454546) internal successors, (54), 21 states have internal predecessors, (54), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) Word has length 65 [2021-11-25 19:43:49,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:43:49,115 INFO L225 Difference]: With dead ends: 631 [2021-11-25 19:43:49,115 INFO L226 Difference]: Without dead ends: 631 [2021-11-25 19:43:49,116 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 309 GetRequests, 206 SyntacticMatches, 22 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2792 ImplicationChecksByTransitivity, 58.5s TimeCoverageRelationStatistics Valid=619, Invalid=6171, Unknown=16, NotChecked=0, Total=6806 [2021-11-25 19:43:49,116 INFO L933 BasicCegarLoop]: 107 mSDtfsCounter, 94 mSDsluCounter, 928 mSDsCounter, 0 mSdLazyCounter, 623 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 1035 SdHoareTripleChecker+Invalid, 934 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 623 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 279 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:43:49,117 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 1035 Invalid, 934 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 623 Invalid, 0 Unknown, 279 Unchecked, 1.6s Time] [2021-11-25 19:43:49,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 631 states. [2021-11-25 19:43:49,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 631 to 625. [2021-11-25 19:43:49,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 625 states, 490 states have (on average 1.5081632653061225) internal successors, (739), 537 states have internal predecessors, (739), 59 states have call successors, (59), 41 states have call predecessors, (59), 41 states have return successors, (59), 46 states have call predecessors, (59), 59 states have call successors, (59) [2021-11-25 19:43:49,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 625 states to 625 states and 857 transitions. [2021-11-25 19:43:49,136 INFO L78 Accepts]: Start accepts. Automaton has 625 states and 857 transitions. Word has length 65 [2021-11-25 19:43:49,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:43:49,136 INFO L470 AbstractCegarLoop]: Abstraction has 625 states and 857 transitions. [2021-11-25 19:43:49,137 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 2.4545454545454546) internal successors, (54), 21 states have internal predecessors, (54), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-25 19:43:49,137 INFO L276 IsEmpty]: Start isEmpty. Operand 625 states and 857 transitions. [2021-11-25 19:43:49,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 19:43:49,138 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:43:49,138 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1] [2021-11-25 19:43:49,189 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2021-11-25 19:43:49,366 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (56)] Ended with exit code 0 [2021-11-25 19:43:49,559 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (57)] Forceful destruction successful, exit code 0 [2021-11-25 19:43:49,752 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 19:43:49,753 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting val_from_nodeErr1REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:43:49,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:43:49,753 INFO L85 PathProgramCache]: Analyzing trace with hash -1126558282, now seen corresponding path program 1 times [2021-11-25 19:43:49,754 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:43:49,754 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [70455361] [2021-11-25 19:43:49,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:43:49,754 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:43:49,754 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:43:49,755 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:43:49,757 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (59)] Waiting until timeout for monitored process [2021-11-25 19:43:50,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:43:50,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 82 conjunts are in the unsatisfiable core [2021-11-25 19:43:50,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:43:50,616 INFO L388 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 11 treesize of output 7 [2021-11-25 19:43:50,739 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 19:43:50,740 INFO L388 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 23 treesize of output 23 [2021-11-25 19:43:50,753 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:43:50,809 INFO L388 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 14 treesize of output 16 [2021-11-25 19:43:50,825 INFO L388 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 7 treesize of output 3 [2021-11-25 19:43:51,248 INFO L388 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 15 treesize of output 11 [2021-11-25 19:43:51,262 INFO L388 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 11 treesize of output 7 [2021-11-25 19:43:51,447 INFO L354 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2021-11-25 19:43:51,447 INFO L388 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 25 treesize of output 24 [2021-11-25 19:43:51,462 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:43:51,462 INFO L388 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 44 treesize of output 39 [2021-11-25 19:43:51,728 INFO L354 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2021-11-25 19:43:51,728 INFO L388 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 42 treesize of output 45 [2021-11-25 19:43:51,826 INFO L354 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2021-11-25 19:43:51,826 INFO L388 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 30 [2021-11-25 19:43:52,307 INFO L388 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 50 treesize of output 38 [2021-11-25 19:43:52,816 INFO L354 Elim1Store]: treesize reduction 4, result has 80.0 percent of original size [2021-11-25 19:43:52,816 INFO L388 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 29 treesize of output 29 [2021-11-25 19:43:52,824 INFO L388 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 38 treesize of output 40 [2021-11-25 19:43:53,983 INFO L354 Elim1Store]: treesize reduction 15, result has 6.3 percent of original size [2021-11-25 19:43:53,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 85 treesize of output 48 [2021-11-25 19:43:53,989 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 17 [2021-11-25 19:43:54,410 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 2 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:43:54,410 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:43:58,470 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:43:58,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [70455361] [2021-11-25 19:43:58,471 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [70455361] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:43:58,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [514386788] [2021-11-25 19:43:58,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:43:58,471 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:43:58,471 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:43:58,472 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:43:58,473 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (60)] Waiting until timeout for monitored process [2021-11-25 19:44:00,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:44:00,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 105 conjunts are in the unsatisfiable core [2021-11-25 19:44:00,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:44:00,752 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:44:00,764 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:44:02,096 INFO L388 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 11 treesize of output 7 [2021-11-25 19:44:02,109 INFO L388 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 11 treesize of output 7 [2021-11-25 19:44:02,776 INFO L354 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2021-11-25 19:44:02,776 INFO L388 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 16 treesize of output 26 [2021-11-25 19:44:02,822 INFO L354 Elim1Store]: treesize reduction 20, result has 39.4 percent of original size [2021-11-25 19:44:02,823 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 34 treesize of output 36 [2021-11-25 19:44:03,136 INFO L388 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 14 treesize of output 16 [2021-11-25 19:44:03,145 INFO L388 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 24 treesize of output 24 [2021-11-25 19:44:03,175 INFO L388 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 9 treesize of output 5 [2021-11-25 19:44:03,185 INFO L388 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 7 treesize of output 3 [2021-11-25 19:44:04,766 INFO L388 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 15 treesize of output 11 [2021-11-25 19:44:04,787 INFO L388 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 15 treesize of output 11 [2021-11-25 19:44:05,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:44:05,137 INFO L388 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 25 treesize of output 24 [2021-11-25 19:44:05,164 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:44:05,165 INFO L388 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 25 treesize of output 24 [2021-11-25 19:44:05,263 INFO L354 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2021-11-25 19:44:05,263 INFO L388 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 30 [2021-11-25 19:44:05,347 INFO L354 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2021-11-25 19:44:05,347 INFO L388 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 30 [2021-11-25 19:44:05,921 INFO L388 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 23 treesize of output 15 [2021-11-25 19:44:05,934 INFO L388 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 54 treesize of output 38 [2021-11-25 19:44:06,720 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:44:06,720 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 22 [2021-11-25 19:44:06,745 INFO L354 Elim1Store]: treesize reduction 4, result has 75.0 percent of original size [2021-11-25 19:44:06,745 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 27 [2021-11-25 19:44:09,189 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-11-25 19:44:09,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 49 treesize of output 27 [2021-11-25 19:44:09,241 INFO L354 Elim1Store]: treesize reduction 6, result has 76.0 percent of original size [2021-11-25 19:44:09,241 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 68 treesize of output 45 [2021-11-25 19:44:09,991 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 1 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:44:09,991 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:44:25,600 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [514386788] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:44:25,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [191831763] [2021-11-25 19:44:25,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:44:25,600 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:44:25,601 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:44:25,603 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:44:25,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-11-25 19:44:25,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:44:25,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 81 conjunts are in the unsatisfiable core [2021-11-25 19:44:25,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:44:26,084 INFO L388 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 11 treesize of output 7 [2021-11-25 19:44:26,150 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 19:44:26,150 INFO L388 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 21 treesize of output 21 [2021-11-25 19:44:26,382 INFO L388 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 14 treesize of output 16 [2021-11-25 19:44:26,392 INFO L388 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 7 treesize of output 3 [2021-11-25 19:44:27,590 INFO L388 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 11 treesize of output 7 [2021-11-25 19:44:27,626 INFO L388 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 15 treesize of output 11 [2021-11-25 19:44:28,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:44:28,032 INFO L388 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 43 treesize of output 38 [2021-11-25 19:44:28,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:44:28,077 INFO L388 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 25 treesize of output 24 [2021-11-25 19:44:28,139 INFO L354 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2021-11-25 19:44:28,140 INFO L388 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 30 [2021-11-25 19:44:28,221 INFO L354 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2021-11-25 19:44:28,222 INFO L388 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 43 treesize of output 46 [2021-11-25 19:44:28,880 INFO L388 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 50 treesize of output 38 [2021-11-25 19:44:29,827 INFO L354 Elim1Store]: treesize reduction 4, result has 80.0 percent of original size [2021-11-25 19:44:29,827 INFO L388 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 31 treesize of output 31 [2021-11-25 19:44:29,835 INFO L388 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 38 treesize of output 40 [2021-11-25 19:44:31,924 INFO L354 Elim1Store]: treesize reduction 15, result has 6.3 percent of original size [2021-11-25 19:44:31,924 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 85 treesize of output 48 [2021-11-25 19:44:31,929 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 45 treesize of output 20 [2021-11-25 19:44:31,973 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 6 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:44:31,973 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:44:34,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [191831763] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:44:34,757 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:44:34,758 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 25] total 65 [2021-11-25 19:44:34,758 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999782038] [2021-11-25 19:44:34,758 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:44:34,758 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-11-25 19:44:34,759 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:44:34,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-11-25 19:44:34,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=316, Invalid=5229, Unknown=5, NotChecked=0, Total=5550 [2021-11-25 19:44:34,760 INFO L87 Difference]: Start difference. First operand 625 states and 857 transitions. Second operand has 66 states, 65 states have (on average 2.1846153846153844) internal successors, (142), 61 states have internal predecessors, (142), 16 states have call successors, (16), 15 states have call predecessors, (16), 14 states have return successors, (14), 11 states have call predecessors, (14), 14 states have call successors, (14) [2021-11-25 19:44:46,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:44:46,509 INFO L93 Difference]: Finished difference Result 633 states and 863 transitions. [2021-11-25 19:44:46,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-25 19:44:46,510 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 65 states have (on average 2.1846153846153844) internal successors, (142), 61 states have internal predecessors, (142), 16 states have call successors, (16), 15 states have call predecessors, (16), 14 states have return successors, (14), 11 states have call predecessors, (14), 14 states have call successors, (14) Word has length 65 [2021-11-25 19:44:46,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:44:46,517 INFO L225 Difference]: With dead ends: 633 [2021-11-25 19:44:46,517 INFO L226 Difference]: Without dead ends: 633 [2021-11-25 19:44:46,519 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 195 SyntacticMatches, 5 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3642 ImplicationChecksByTransitivity, 40.4s TimeCoverageRelationStatistics Valid=744, Invalid=11241, Unknown=5, NotChecked=0, Total=11990 [2021-11-25 19:44:46,520 INFO L933 BasicCegarLoop]: 134 mSDtfsCounter, 167 mSDsluCounter, 2502 mSDsCounter, 0 mSdLazyCounter, 1841 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 2636 SdHoareTripleChecker+Invalid, 2861 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 1841 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 986 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2021-11-25 19:44:46,521 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [171 Valid, 2636 Invalid, 2861 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 1841 Invalid, 0 Unknown, 986 Unchecked, 4.9s Time] [2021-11-25 19:44:46,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 633 states. [2021-11-25 19:44:46,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 633 to 625. [2021-11-25 19:44:46,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 625 states, 490 states have (on average 1.5020408163265306) internal successors, (736), 537 states have internal predecessors, (736), 59 states have call successors, (59), 41 states have call predecessors, (59), 41 states have return successors, (59), 46 states have call predecessors, (59), 59 states have call successors, (59) [2021-11-25 19:44:46,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 625 states to 625 states and 854 transitions. [2021-11-25 19:44:46,542 INFO L78 Accepts]: Start accepts. Automaton has 625 states and 854 transitions. Word has length 65 [2021-11-25 19:44:46,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:44:46,542 INFO L470 AbstractCegarLoop]: Abstraction has 625 states and 854 transitions. [2021-11-25 19:44:46,543 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 65 states have (on average 2.1846153846153844) internal successors, (142), 61 states have internal predecessors, (142), 16 states have call successors, (16), 15 states have call predecessors, (16), 14 states have return successors, (14), 11 states have call predecessors, (14), 14 states have call successors, (14) [2021-11-25 19:44:46,543 INFO L276 IsEmpty]: Start isEmpty. Operand 625 states and 854 transitions. [2021-11-25 19:44:46,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-25 19:44:46,545 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:44:46,545 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:44:46,598 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2021-11-25 19:44:46,775 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (60)] Forceful destruction successful, exit code 0 [2021-11-25 19:44:46,982 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (59)] Ended with exit code 0 [2021-11-25 19:44:47,169 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:44:47,169 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting list_addErr9REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:44:47,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:44:47,169 INFO L85 PathProgramCache]: Analyzing trace with hash 413309649, now seen corresponding path program 1 times [2021-11-25 19:44:47,170 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:44:47,170 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [641927703] [2021-11-25 19:44:47,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:44:47,170 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:44:47,170 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:44:47,171 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:44:47,173 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (62)] Waiting until timeout for monitored process [2021-11-25 19:44:47,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:44:47,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 367 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 19:44:47,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:44:47,636 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:44:48,136 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:44:48,137 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:44:48,137 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:44:48,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [641927703] [2021-11-25 19:44:48,137 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [641927703] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:44:48,137 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:44:48,137 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-25 19:44:48,138 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [356093110] [2021-11-25 19:44:48,138 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:44:48,138 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 19:44:48,138 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:44:48,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 19:44:48,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:44:48,139 INFO L87 Difference]: Start difference. First operand 625 states and 854 transitions. Second operand has 8 states, 7 states have (on average 7.857142857142857) internal successors, (55), 7 states have internal predecessors, (55), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-25 19:44:49,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:44:49,084 INFO L93 Difference]: Finished difference Result 653 states and 861 transitions. [2021-11-25 19:44:49,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 19:44:49,092 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 7.857142857142857) internal successors, (55), 7 states have internal predecessors, (55), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 66 [2021-11-25 19:44:49,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:44:49,097 INFO L225 Difference]: With dead ends: 653 [2021-11-25 19:44:49,098 INFO L226 Difference]: Without dead ends: 653 [2021-11-25 19:44:49,098 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 55 SyntacticMatches, 5 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2021-11-25 19:44:49,099 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 79 mSDsluCounter, 417 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 523 SdHoareTripleChecker+Invalid, 332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 51 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:44:49,099 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 523 Invalid, 332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 279 Invalid, 0 Unknown, 51 Unchecked, 0.8s Time] [2021-11-25 19:44:49,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 653 states. [2021-11-25 19:44:49,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 653 to 625. [2021-11-25 19:44:49,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 625 states, 490 states have (on average 1.4816326530612245) internal successors, (726), 537 states have internal predecessors, (726), 59 states have call successors, (59), 41 states have call predecessors, (59), 41 states have return successors, (59), 46 states have call predecessors, (59), 59 states have call successors, (59) [2021-11-25 19:44:49,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 625 states to 625 states and 844 transitions. [2021-11-25 19:44:49,120 INFO L78 Accepts]: Start accepts. Automaton has 625 states and 844 transitions. Word has length 66 [2021-11-25 19:44:49,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:44:49,121 INFO L470 AbstractCegarLoop]: Abstraction has 625 states and 844 transitions. [2021-11-25 19:44:49,121 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 7.857142857142857) internal successors, (55), 7 states have internal predecessors, (55), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-25 19:44:49,121 INFO L276 IsEmpty]: Start isEmpty. Operand 625 states and 844 transitions. [2021-11-25 19:44:49,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-25 19:44:49,123 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:44:49,123 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1] [2021-11-25 19:44:49,146 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (62)] Forceful destruction successful, exit code 0 [2021-11-25 19:44:49,336 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:44:49,336 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting val_from_nodeErr0REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 44 more)] === [2021-11-25 19:44:49,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:44:49,337 INFO L85 PathProgramCache]: Analyzing trace with hash -2079650077, now seen corresponding path program 1 times [2021-11-25 19:44:49,337 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:44:49,338 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1374112026] [2021-11-25 19:44:49,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:44:49,338 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:44:49,338 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:44:49,339 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:44:49,380 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (63)] Waiting until timeout for monitored process [2021-11-25 19:44:50,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:44:50,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 382 conjuncts, 118 conjunts are in the unsatisfiable core [2021-11-25 19:44:50,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:44:50,253 INFO L354 Elim1Store]: treesize reduction 13, result has 23.5 percent of original size [2021-11-25 19:44:50,254 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 23 treesize of output 21 [2021-11-25 19:44:50,322 INFO L388 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 14 treesize of output 16 [2021-11-25 19:44:50,349 INFO L388 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 7 treesize of output 3 [2021-11-25 19:44:50,747 INFO L388 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 15 treesize of output 11 [2021-11-25 19:44:50,909 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:44:50,910 INFO L388 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 25 treesize of output 24 [2021-11-25 19:44:50,930 INFO L388 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 11 treesize of output 7 [2021-11-25 19:44:50,995 INFO L354 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2021-11-25 19:44:50,996 INFO L388 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 30 [2021-11-25 19:44:51,236 INFO L388 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 43 treesize of output 35 [2021-11-25 19:44:51,405 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 19:44:51,406 INFO L388 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 19 treesize of output 19 [2021-11-25 19:44:51,581 INFO L354 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2021-11-25 19:44:51,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 30 treesize of output 40 [2021-11-25 19:44:51,603 INFO L388 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 23 [2021-11-25 19:44:51,626 INFO L388 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 9 treesize of output 3 [2021-11-25 19:44:51,755 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:44:51,755 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 15 [2021-11-25 19:44:51,762 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2021-11-25 19:44:56,625 INFO L388 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 15 treesize of output 11 [2021-11-25 19:44:58,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:44:58,902 INFO L388 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 25 treesize of output 24 [2021-11-25 19:45:05,318 INFO L354 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2021-11-25 19:45:05,318 INFO L388 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 30 [2021-11-25 19:45:09,970 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:45:09,972 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:45:09,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:45:09,975 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:45:10,039 INFO L354 Elim1Store]: treesize reduction 34, result has 49.3 percent of original size [2021-11-25 19:45:10,039 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 181 treesize of output 78 [2021-11-25 19:45:10,046 INFO L388 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 115 treesize of output 99 [2021-11-25 19:45:13,143 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 108 treesize of output 67 [2021-11-25 19:45:14,092 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:45:14,092 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 79 treesize of output 41 [2021-11-25 19:45:15,140 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:45:15,140 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:45:17,686 INFO L354 Elim1Store]: treesize reduction 22, result has 75.3 percent of original size [2021-11-25 19:45:17,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 70 treesize of output 98 [2021-11-25 19:45:18,321 INFO L354 Elim1Store]: treesize reduction 22, result has 75.3 percent of original size [2021-11-25 19:45:18,322 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 70 treesize of output 98 [2021-11-25 19:45:26,305 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:45:26,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1374112026] [2021-11-25 19:45:26,306 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1374112026] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:45:26,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1112315483] [2021-11-25 19:45:26,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:45:26,306 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:45:26,306 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:45:26,307 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:45:26,308 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (64)] Waiting until timeout for monitored process [2021-11-25 19:45:28,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:45:28,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 382 conjuncts, 114 conjunts are in the unsatisfiable core [2021-11-25 19:45:28,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:45:28,698 INFO L354 Elim1Store]: treesize reduction 30, result has 45.5 percent of original size [2021-11-25 19:45:28,698 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 19:45:29,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-11-25 19:45:29,149 INFO L388 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 7 treesize of output 3 [2021-11-25 19:45:31,101 INFO L388 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 15 treesize of output 11 [2021-11-25 19:45:31,664 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:45:31,664 INFO L388 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 25 treesize of output 24 [2021-11-25 19:45:31,700 INFO L388 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 11 treesize of output 7 [2021-11-25 19:45:31,765 INFO L354 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2021-11-25 19:45:31,765 INFO L388 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 30 [2021-11-25 19:45:34,583 INFO L388 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 23 treesize of output 15 [2021-11-25 19:45:35,221 INFO L354 Elim1Store]: treesize reduction 12, result has 58.6 percent of original size [2021-11-25 19:45:35,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 40 treesize of output 44 [2021-11-25 19:45:35,620 INFO L354 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2021-11-25 19:45:35,620 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 42 treesize of output 44 [2021-11-25 19:45:35,658 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-11-25 19:45:35,687 INFO L388 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 7 treesize of output 3 [2021-11-25 19:45:35,708 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:45:35,709 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 15 [2021-11-25 19:45:36,473 INFO L388 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 15 treesize of output 11 [2021-11-25 19:45:41,317 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:45:41,317 INFO L388 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 25 treesize of output 24 [2021-11-25 19:45:52,149 INFO L354 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2021-11-25 19:45:52,150 INFO L388 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 30 [2021-11-25 19:45:57,415 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:45:57,417 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:45:57,419 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:45:57,419 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:45:57,462 INFO L354 Elim1Store]: treesize reduction 38, result has 35.6 percent of original size [2021-11-25 19:45:57,462 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 185 treesize of output 70 [2021-11-25 19:45:57,470 INFO L388 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 56 treesize of output 44 [2021-11-25 19:46:02,191 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 127 treesize of output 82 [2021-11-25 19:46:03,861 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 19:46:03,861 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 90 treesize of output 36 [2021-11-25 19:46:05,107 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 27 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:46:05,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:46:06,352 INFO L354 Elim1Store]: treesize reduction 5, result has 86.1 percent of original size [2021-11-25 19:46:06,352 INFO L388 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 55 treesize of output 54 [2021-11-25 19:46:07,193 INFO L354 Elim1Store]: treesize reduction 5, result has 86.1 percent of original size [2021-11-25 19:46:07,194 INFO L388 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 55 treesize of output 54 [2021-11-25 19:46:16,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1112315483] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:46:16,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [676452208] [2021-11-25 19:46:16,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:16,107 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:46:16,107 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:46:16,110 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:46:16,114 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7278513e-8a54-4303-a706-d84cd93f858b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-25 19:46:16,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:16,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 382 conjuncts, 108 conjunts are in the unsatisfiable core [2021-11-25 19:46:16,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:46:16,948 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 19:46:16,949 INFO L388 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 16 treesize of output 16 [2021-11-25 19:46:17,330 INFO L388 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 14 treesize of output 16 [2021-11-25 19:46:17,732 INFO L388 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 7 treesize of output 3 [2021-11-25 19:46:19,876 INFO L388 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 15 treesize of output 11 [2021-11-25 19:46:20,432 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:46:20,432 INFO L388 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 25 treesize of output 24 [2021-11-25 19:46:20,479 INFO L388 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 11 treesize of output 7 [2021-11-25 19:46:20,548 INFO L354 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2021-11-25 19:46:20,548 INFO L388 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 30 [2021-11-25 19:46:21,224 INFO L388 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 35 treesize of output 27 [2021-11-25 19:46:22,065 INFO L354 Elim1Store]: treesize reduction 8, result has 61.9 percent of original size [2021-11-25 19:46:22,065 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 19:46:22,534 INFO L388 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 14 treesize of output 16 [2021-11-25 19:46:22,570 INFO L354 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2021-11-25 19:46:22,570 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 34 treesize of output 38 [2021-11-25 19:46:22,600 INFO L388 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 7 treesize of output 3 [2021-11-25 19:46:22,614 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-25 19:46:22,614 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 11 [2021-11-25 19:46:31,103 INFO L388 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 15 treesize of output 11 [2021-11-25 19:46:39,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:46:39,968 INFO L388 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 25 treesize of output 24 [2021-11-25 19:46:50,937 INFO L354 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2021-11-25 19:46:50,937 INFO L388 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 30 [2021-11-25 19:46:54,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:46:54,376 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:46:54,382 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:46:54,447 INFO L354 Elim1Store]: treesize reduction 134, result has 13.5 percent of original size [2021-11-25 19:46:54,448 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 66 [2021-11-25 19:46:54,455 INFO L388 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 27 treesize of output 19